/*
 * Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
 * Copyright 2004 James Bursa <bursa@users.sourceforge.net>
 * Copyright 2003 John M Bell <jmb202@ecs.soton.ac.uk>
 * Copyright 2004 Andrew Timmins <atimmins@blueyonder.co.uk>
 * Copyright 2005 Richard Wilson <info@tinct.net>
 * Copyright 2005 Adrian Lees <adrianl@users.sourceforge.net>
 * Copyright 2010-2014 Stephen Fryatt <stevef@netsurf-browser.org>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * \file
 * Implementation of RISC OS browser window handling.
 */

#include <assert.h>
#include <ctype.h>
#include <math.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdint.h>
#include <time.h>
#include <string.h>
#include <limits.h>
#include <oslib/colourtrans.h>
#include <oslib/osbyte.h>
#include <oslib/osfile.h>
#include <oslib/osspriteop.h>
#include <oslib/wimp.h>
#include <oslib/wimpspriteop.h>
#include <nsutils/time.h>

#include "netsurf/inttypes.h"
#include "utils/nsoption.h"
#include "utils/log.h"
#include "utils/talloc.h"
#include "utils/file.h"
#include "utils/utf8.h"
#include "utils/utils.h"
#include "utils/messages.h"
#include "utils/string.h"
#include "utils/nsurl.h"
#include "netsurf/content.h"
#include "netsurf/browser_window.h"
#include "netsurf/plotters.h"
#include "netsurf/window.h"
#include "netsurf/bitmap.h"
#include "netsurf/url_db.h"
#include "netsurf/form.h"
#include "netsurf/keypress.h"
#include "desktop/browser_history.h"
#include "desktop/cookie_manager.h"
#include "desktop/searchweb.h"

#include "riscos/bitmap.h"
#include "riscos/buffer.h"
#include "riscos/cookies.h"
#include "riscos/dialog.h"
#include "riscos/local_history.h"
#include "riscos/global_history.h"
#include "riscos/pageinfo.h"
#include "riscos/gui.h"
#include "riscos/gui/status_bar.h"
#include "riscos/help.h"
#include "riscos/hotlist.h"
#include "riscos/menus.h"
#include "riscos/mouse.h"
#include "riscos/oslib_pre7.h"
#include "riscos/save.h"
#include "riscos/content-handlers/sprite.h"
#include "riscos/textselection.h"
#include "riscos/toolbar.h"
#include "riscos/url_complete.h"
#include "riscos/url_suggest.h"
#include "riscos/wimp.h"
#include "riscos/wimp_event.h"
#include "riscos/wimputils.h"
#include "riscos/window.h"
#include "riscos/ucstables.h"
#include "riscos/filetype.h"


#ifndef wimp_KEY_END
#define wimp_KEY_END wimp_KEY_COPY
#endif

#ifndef wimp_WINDOW_GIVE_SHADED_ICON_INFO
	/* RISC OS 5+. Requires OSLib trunk. */
#define wimp_WINDOW_GIVE_SHADED_ICON_INFO ((wimp_extra_window_flags) 0x10u)
#endif

#define SCROLL_VISIBLE_PADDING 32

#define SCROLL_TOP INT_MIN
#define SCROLL_PAGE_UP (INT_MIN + 1)
#define SCROLL_PAGE_DOWN (INT_MAX - 1)
#define SCROLL_BOTTOM INT_MAX

/** Remembers which iconised sprite numbers are in use */
static bool iconise_used[64];
static int iconise_next = 0;

/** Whether a pressed mouse button has become a drag */
static bool mouse_drag_select;
static bool mouse_drag_adjust;

/** List of all browser windows. */
static struct gui_window	*window_list = 0;
/** GUI window which is being redrawn. Valid only during redraw. */
struct gui_window		*ro_gui_current_redraw_gui;
/** Form control which gui_form_select_menu is for. */
static struct form_control	*gui_form_select_control;
/** The browser window menu handle. */
static wimp_menu		*ro_gui_browser_window_menu = NULL;
/** Menu of options for form select controls. */
static wimp_menu		*gui_form_select_menu = NULL;
/** Main content object under menu, or 0 if none. */
static struct hlcache_handle		*current_menu_main = 0;
/** Object under menu, or 0 if no object. */
static struct hlcache_handle		*current_menu_object = 0;
/** URL of link under menu, or 0 if no link. */
static nsurl			*current_menu_url = 0;

static float scale_snap_to[] = {0.10, 0.125, 0.25, 0.333, 0.5, 0.75,
				1.0,
				1.5, 2.0, 3.0, 4.0, 6.0, 8.0, 12.0, 16.0};
#define SCALE_SNAP_TO_SIZE (sizeof scale_snap_to) / (sizeof(float))

/** An entry in ro_gui_pointer_table. */
struct ro_gui_pointer_entry {
	bool wimp_area;  /** The pointer is in the Wimp's sprite area. */
	char sprite_name[16];
	int xactive;
	int yactive;
};

/**
 * Map from gui_pointer_shape to pointer sprite data. Must be ordered as
 * enum gui_pointer_shape. */
struct ro_gui_pointer_entry ro_gui_pointer_table[] = {
	{ true, "ptr_default", 0, 0 },
	{ false, "ptr_point", 6, 0 },
	{ false, "ptr_caret", 4, 9 },
	{ false, "ptr_menu", 6, 4 },
	{ false, "ptr_ud", 6, 7 },
	{ false, "ptr_ud", 6, 7 },
	{ false, "ptr_lr", 7, 6 },
	{ false, "ptr_lr", 7, 6 },
	{ false, "ptr_ld", 7, 7 },
	{ false, "ptr_ld", 7, 7 },
	{ false, "ptr_rd", 7, 7 },
	{ false, "ptr_rd", 6, 7 },
	{ false, "ptr_cross", 7, 7 },
	{ false, "ptr_move", 8, 0 },
	{ false, "ptr_wait", 7, 10 },
	{ false, "ptr_help", 0, 0 },
	{ false, "ptr_nodrop", 0, 0 },
	{ false, "ptr_nt_allwd", 10, 10 },
	{ false, "ptr_progress", 0, 0 },
};

struct update_box {
	int x0;
	int y0;
	int x1;
	int y1;
	bool use_buffer;
	struct gui_window *g;
	struct update_box *next;
};

struct update_box *pending_updates;
#define MARGIN 4


/**
 * Place the caret in a browser window.
 *
 * \param g window with caret
 * \param x coordinates of caret
 * \param y coordinates of caret
 * \param height height of caret
 * \param clip clip rectangle, or NULL if none
 */
static void
gui_window_place_caret(struct gui_window *g,
		       int x,
		       int y,
		       int height,
		       const struct rect *clip)
{
	os_error *error;

	error = xwimp_set_caret_position(g->window, -1,
			x * 2, -(y + height) * 2, height * 2, -1);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_set_caret_position: 0x%x: %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
	}
}


/**
 * Updates a windows extent.
 *
 * \param  g  the gui_window to update
 * \param  width  the minimum width, or -1 to use window width
 * \param  height  the minimum height, or -1 to use window height
 */
static void gui_window_set_extent(struct gui_window *g, int width, int height)
{
	int screen_width;
	int toolbar_height = 0;
	wimp_window_state state;
	os_error *error;

	if (g->toolbar) {
		toolbar_height = ro_toolbar_full_height(g->toolbar);
	}

	/* get the current state */
	if ((height == -1) || (width == -1)) {
		state.w = g->window;
		error = xwimp_get_window_state(&state);
		if (error) {
			NSLOG(netsurf, INFO,
			      "xwimp_get_window_state: 0x%x: %s",
			      error->errnum,
			      error->errmess);
			ro_warn_user("WimpError", error->errmess);
			return;
		}
		if (width == -1)
			width = state.visible.x1 - state.visible.x0;
		if (height == -1) {
			height = state.visible.y1 - state.visible.y0;
			height -= toolbar_height;
		}
	}

	/* the top-level framed window is a total pain. to get it to maximise
	 * to the top of the screen we need to fake it having a suitably large
	 * extent */
	if (browser_window_is_frameset(g->bw)) {
		ro_gui_screen_size(&screen_width, &height);
		if (g->toolbar)
			height -= ro_toolbar_full_height(g->toolbar);
		height -= ro_get_hscroll_height(g->window);
		height -= ro_get_title_height(g->window);
	}
	if (browser_window_has_content(g->bw)) {
		int w, h;
		browser_window_get_extents(g->bw, true, &w, &h);
		width = max(width, w * 2);
		height = max(height, h * 2);
	}
	os_box extent = { 0, -height, width, toolbar_height };
	error = xwimp_set_extent(g->window, &extent);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_set_extent: 0x%x: %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return;
	}
}


/**
 * Open a window
 *
 * opens a window using the given wimp_open, handling toolbars and resizing.
 *
 * \param open the window open event information
 */
static void ro_gui_window_open(wimp_open *open)
{
	struct gui_window *g;
	int width = open->visible.x1 - open->visible.x0;
	int height = open->visible.y1 - open->visible.y0;
	browser_scrolling h_scroll;
	browser_scrolling v_scroll;
	int toolbar_height = 0;
	float new_scale = 0;
	wimp_window_state state;
	os_error *error;
	wimp_w parent;
	bits linkage;
	bool have_content;

	g = (struct gui_window *)ro_gui_wimp_event_get_user_data(open->w);

	if (open->next == wimp_TOP && g->iconise_icon >= 0) {
		/* window is no longer iconised, release its sprite number */
		iconise_used[g->iconise_icon] = false;
		g->iconise_icon = -1;
	}

	have_content = browser_window_has_content(g->bw);

	/* get the current flags/nesting state */
	state.w = g->window;
	error = xwimp_get_window_state_and_nesting(&state, &parent, &linkage);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_get_window_state: 0x%x: %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return;
	}

	/* account for toolbar height, if present */
	if (g->toolbar)
		toolbar_height = ro_toolbar_full_height(g->toolbar);
	height -= toolbar_height;

	/* work with the state from now on so we can modify flags */
	state.visible = open->visible;
	state.xscroll = open->xscroll;
	state.yscroll = open->yscroll;
	state.next = open->next;

	browser_window_get_scrollbar_type(g->bw, &h_scroll, &v_scroll);

	/* handle 'auto' scroll bars' and non-fitting scrollbar removal */
	if ((h_scroll != BW_SCROLLING_NO) && (v_scroll != BW_SCROLLING_NO)) {
		int size;

		/* windows lose scrollbars when containing a frameset */
		bool no_hscroll = false;
		bool no_vscroll = browser_window_is_frameset(g->bw);

		/* hscroll */
		size = ro_get_hscroll_height(NULL);
		size -= 2; /* 1px border on both sides */
		if (!no_hscroll) {
			if (!(state.flags & wimp_WINDOW_HSCROLL)) {
				height -= size;
				state.visible.y0 += size;
				if (have_content) {
					browser_window_schedule_reformat(g->bw);
				}
			}
			state.flags |= wimp_WINDOW_HSCROLL;
		} else {
			if (state.flags & wimp_WINDOW_HSCROLL) {
				height += size;
				state.visible.y0 -= size;
				if (have_content) {
					browser_window_schedule_reformat(g->bw);
				}
			}
			state.flags &= ~wimp_WINDOW_HSCROLL;
		}

		/* vscroll */
		size = ro_get_vscroll_width(NULL);
		size -= 2; /* 1px border on both sides */
		if (!no_vscroll) {
			if (!(state.flags & wimp_WINDOW_VSCROLL)) {
				width -= size;
				state.visible.x1 -= size;
				if (have_content) {
					browser_window_schedule_reformat(g->bw);
				}
			}
			state.flags |= wimp_WINDOW_VSCROLL;
		} else {
			if (state.flags & wimp_WINDOW_VSCROLL) {
				width += size;
				state.visible.x1 += size;
				if (have_content) {
					browser_window_schedule_reformat(g->bw);
				}
			}
			state.flags &= ~wimp_WINDOW_VSCROLL;
		}
	}

	/* reformat or change extent if necessary */
	if (have_content &&
	    (g->old_width != width || g->old_height != height)) {
		/* Ctrl-resize of a top-level window scales the content size */
		if ((g->old_width > 0) &&
		    (g->old_width != width) &&
		    (ro_gui_ctrl_pressed())) {
			new_scale = (browser_window_get_scale(g->bw) * width) / g->old_width;
		}
		browser_window_schedule_reformat(g->bw);
	}
	if (g->update_extent ||
	    g->old_width != width ||
	    g->old_height != height) {
		g->old_width = width;
		g->old_height = height;
		g->update_extent = false;
		gui_window_set_extent(g, width, height);
	}

	/* first resize stops any flickering by making the URL window on top */
	ro_gui_url_complete_resize(g->toolbar, PTR_WIMP_OPEN(&state));

	/* Windows containing framesets can only be scrolled via the core, which
	 * is implementing frame scrollbars itself.  The x and y offsets are
	 * therefore fixed.
	 */

	if (browser_window_is_frameset(g->bw)) {
		state.xscroll = 0;
		state.yscroll = toolbar_height;
	}

	error = xwimp_open_window_nested_with_flags(&state, parent, linkage);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_open_window: 0x%x: %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return;
	}

	/* update the toolbar */
	if (g->status_bar)
		ro_gui_status_bar_resize(g->status_bar);
	if (g->toolbar) {
		ro_toolbar_process(g->toolbar, -1, false);
		/* second resize updates to the new URL bar width */
		ro_gui_url_complete_resize(g->toolbar, open);
	}

	/* set the new scale from a ctrl-resize. this must be done at the end as
	 * it may cause a frameset recalculation based on the new window size.
	 */
	if (new_scale > 0) {
		ro_gui_window_set_scale(g, new_scale);
	}
}


/**
 * Update the extent of the inside of a browser window to that of the
 * current content.
 *
 * \param g gui_window to update the extent of
 */
static void gui_window_update_extent(struct gui_window *g)
{
	os_error *error;
	wimp_window_info info;

	assert(g);

	info.w = g->window;
	error = xwimp_get_window_info_header_only(&info);
	if (error) {
		NSLOG(netsurf, INFO,
		      "xwimp_get_window_info_header_only: 0x%x: %s",
		      error->errnum,
		      error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return;
	}

	/* scroll on toolbar height change */
	if (g->toolbar) {
		int scroll = ro_toolbar_height(g->toolbar) - info.extent.y1;
		info.yscroll += scroll;
	}

	/* Handle change of extents */
	g->update_extent = true;
	ro_gui_window_open(PTR_WIMP_OPEN(&info));
}


/**
 * Update a window and its toolbar
 *
 * makes a window and toolbar reflect a new theme: used as a callback
 * by the toolbar module when a theme change affects a toolbar.
 *
 * \param data void pointer to the window's gui_window struct
 * \param ok true if the bar still exists; else false.
 */
static void ro_gui_window_update_theme(void *data, bool ok)
{
	struct gui_window *g = (struct gui_window *) data;

	if (g != NULL && g->toolbar != NULL) {
		if (ok) {
			gui_window_update_extent(g);
		} else {
			g->toolbar = NULL;
		}
	}
}


/**
 * Update a window to reflect a change in toolbar size: used as a callback by
 * the toolbar module when a toolbar height changes.
 *
 * \param data void pointer the window's gui_window struct
 */
static void ro_gui_window_update_toolbar(void *data)
{
	struct gui_window *g = (struct gui_window *) data;

	if (g != NULL) {
		gui_window_update_extent(g);
	}
}


/**
 * Update the toolbar buttons for a given browser window to reflect the
 * current state of its contents.
 *
 * Note that the parameters to this function are arranged so that it can be
 * supplied to the toolbar module as an button state update callback.
 *
 * \param g The browser window to update.
 */
static void ro_gui_window_update_toolbar_buttons(struct gui_window *g)
{
	struct browser_window	*bw;
	struct toolbar		*toolbar;

	if (g == NULL || g->toolbar == NULL)
		return;

	bw = g->bw;
	toolbar = g->toolbar;

	ro_toolbar_set_button_shaded_state(toolbar, TOOLBAR_BUTTON_RELOAD,
			!browser_window_reload_available(bw));

	ro_toolbar_set_button_shaded_state(toolbar, TOOLBAR_BUTTON_STOP,
			!browser_window_stop_available(bw));

	ro_toolbar_set_button_shaded_state(toolbar, TOOLBAR_BUTTON_BACK,
			!browser_window_back_available(bw));

	ro_toolbar_set_button_shaded_state(toolbar, TOOLBAR_BUTTON_FORWARD,
			!browser_window_forward_available(bw));

	ro_toolbar_set_button_shaded_state(toolbar, TOOLBAR_BUTTON_UP,
			!browser_window_up_available(bw));

	ro_toolbar_set_button_shaded_state(toolbar, TOOLBAR_BUTTON_SEARCH,
			!browser_window_can_search(bw));

	ro_toolbar_set_button_shaded_state(toolbar, TOOLBAR_BUTTON_SCALE,
			!browser_window_has_content(bw));

	ro_toolbar_set_button_shaded_state(toolbar, TOOLBAR_BUTTON_PRINT,
			!browser_window_has_content(bw));

	ro_toolbar_set_button_shaded_state(toolbar, TOOLBAR_BUTTON_SAVE_SOURCE,
			!browser_window_has_content(bw));

	ro_toolbar_update_urlsuggest(toolbar);
}


/**
 * Add a hotlist entry for a browser window.
 *
 * \param g The browser window to act on.
 */
static void ro_gui_window_action_add_bookmark(struct gui_window *g)
{
	nsurl *url;

	if (g == NULL || g->bw == NULL || g->toolbar == NULL ||
			browser_window_has_content(g->bw) == false)
		return;

	url = browser_window_access_url(g->bw);

	ro_gui_hotlist_add_page(url);
	ro_toolbar_update_hotlist(g->toolbar);
}


/**
 * Remove a hotlist entry for a browser window.
 *
 * \param g The browser window to act on.
 */
static void ro_gui_window_action_remove_bookmark(struct gui_window *g)
{
	nsurl *url;

	if (g == NULL || g->bw == NULL || g->toolbar == NULL ||
			browser_window_has_content(g->bw) == false)
		return;

	url = browser_window_access_url(g->bw);

	ro_gui_hotlist_remove_page(url);
}


/**
 * Open a local history pane for a browser window.
 *
 * \param gw The browser window to act on.
 */
static void ro_gui_window_action_local_history(struct gui_window *gw)
{
	nserror res;

	if ((gw == NULL) || (gw->bw == NULL)) {
		return;
	}

	res = ro_gui_local_history_present(gw->window, gw->bw);

	if (res != NSERROR_OK) {
		ro_warn_user(messages_get_errorcode(res), 0);
	}
}


/**
 * Perform a Navigate Home action on a browser window.
 *
 * \param g The browser window to act on.
 */
static void ro_gui_window_action_home(struct gui_window *g)
{
	static const char *addr = NETSURF_HOMEPAGE;
	nsurl *url;
	nserror error;

	if (g == NULL || g->bw == NULL)
		return;

	if (nsoption_charp(homepage_url) != NULL) {
		addr = nsoption_charp(homepage_url);
	}

	error = nsurl_create(addr, &url);
	if (error == NSERROR_OK) {
		error = browser_window_navigate(g->bw,
					url,
					NULL,
					BW_NAVIGATE_HISTORY,
					NULL,
					NULL,
					NULL);
		nsurl_unref(url);
	}
	if (error != NSERROR_OK) {
		ro_warn_user(messages_get_errorcode(error), 0);
	}
}


/**
 * Open a text search dialogue for a browser window.
 *
 * \param g The browser window to act on.
 */
static void ro_gui_window_action_search(struct gui_window *g)
{
	if (g == NULL || g->bw == NULL || !browser_window_can_search(g->bw))
		return;

	ro_gui_search_prepare(g->bw);
	ro_gui_dialog_open_persistent(g->window, dialog_search, true);
}


/**
 * Open a zoom dialogue for a browser window.
 *
 * \param g The browser window to act on.
 */
static void ro_gui_window_action_zoom(struct gui_window *g)
{
	if (g == NULL)
		return;

	ro_gui_dialog_prepare_zoom(g);
	ro_gui_dialog_open_persistent(g->window, dialog_zoom, true);
}


/**
 * Open a save dialogue for a browser window contents.
 *
 * \param g The browser window to act on.
 * \param save_type The type of save to open.
 */
static void
ro_gui_window_action_save(struct gui_window *g, gui_save_type save_type)
{
	struct hlcache_handle *h;

	if (g == NULL || g->bw == NULL || !browser_window_has_content(g->bw))
		return;

	h = browser_window_get_content(g->bw);
	if (h == NULL)
		return;

	ro_gui_save_prepare(save_type, h, NULL, NULL, NULL);
	ro_gui_dialog_open_persistent(g->window, dialog_saveas, true);
}


/**
 * Open a print dialogue for a browser window.
 *
 * \param g The browser window to act on.
 */
static void ro_gui_window_action_print(struct gui_window *g)
{
	if (g != NULL) {
		ro_gui_print_prepare(g);
		ro_gui_dialog_open_persistent(g->window, dialog_print, true);
	}
}


/**
 * Prepare the page info window for use.
 *
 * \param g The GUI window block to use.
 */
static void ro_gui_window_prepare_pageinfo(struct gui_window *g)
{
	struct hlcache_handle *h = browser_window_get_content(g->bw);
	char icon_buf[20] = "file_xxx";
	char enc_buf[40];
	const char *icon = icon_buf;
	const char *title, *url;
	lwc_string *mime;
	const char *enc = "-";

	assert(h);

	title = content_get_title(h);
	if (title == NULL)
		title = "-";
	url = nsurl_access(hlcache_handle_get_url(h));
	if (url == NULL)
		url = "-";
	mime = content_get_mime_type(h);

	sprintf(icon_buf, "file_%x", ro_content_filetype(h));
	if (!ro_gui_wimp_sprite_exists(icon_buf))
		sprintf(icon_buf, "file_xxx");

	if (content_get_type(h) == CONTENT_HTML) {
		if (content_get_encoding(h, CONTENT_ENCODING_NORMAL)) {
			snprintf(enc_buf, sizeof enc_buf, "%s (%s)",
				 content_get_encoding(h, CONTENT_ENCODING_NORMAL),
				 content_get_encoding(h, CONTENT_ENCODING_SOURCE));
			enc = enc_buf;
		} else {
			enc = messages_get("EncodingUnk");
		}
	}

	ro_gui_set_icon_string(dialog_pageinfo, ICON_PAGEINFO_ICON,
			icon, true);
	ro_gui_set_icon_string(dialog_pageinfo, ICON_PAGEINFO_TITLE,
			title, true);
	ro_gui_set_icon_string(dialog_pageinfo, ICON_PAGEINFO_URL,
			url, true);
	ro_gui_set_icon_string(dialog_pageinfo, ICON_PAGEINFO_ENC,
			enc, true);
	ro_gui_set_icon_string(dialog_pageinfo, ICON_PAGEINFO_TYPE,
			lwc_string_data(mime), true);

	lwc_string_unref(mime);
}


/**
 * Open a page info box for a browser window.
 *
 * \param g The browser window to act on.
 */
static void ro_gui_window_action_page_info(struct gui_window *g)
{
	if (g == NULL || g->bw == NULL ||
			browser_window_has_content(g->bw) == false)
		return;

	ro_gui_window_prepare_pageinfo(g);
	ro_gui_dialog_open_persistent(g->window, dialog_pageinfo, false);
}


/**
 * Process Mouse_Click events in a toolbar's button bar.
 *
 * This does not handle other clicks in a toolbar: these are handled
 * by the toolbar module itself.
 *
 * \param data The GUI window associated with the click.
 * \param action_type The action type to be handled.
 * \param action The action to process.
 */
static void
ro_gui_window_toolbar_click(void *data,
			    toolbar_action_type action_type,
			    union toolbar_action action)
{
	struct gui_window *g = data;
	nserror err;

	if (g == NULL)
		return;


	if (action_type == TOOLBAR_ACTION_URL) {
		switch (action.url) {
		case TOOLBAR_URL_DRAG_URL:
		{
			gui_save_type save_type;
			nserror err;
			nsurl *url;

			if (!browser_window_has_content(g->bw))
				break;

			if (ro_gui_shift_pressed())
				save_type = GUI_SAVE_LINK_URL;
			else
				save_type = GUI_SAVE_LINK_TEXT;

			err = browser_window_get_url(g->bw, true, &url);
			if (err != NSERROR_OK) {
				/* Fall back to access (won't get fragment). */
				url = nsurl_ref(
					browser_window_access_url(g->bw));
			}

			ro_gui_drag_save_link(save_type, url,
					browser_window_get_title(g->bw), g);

			nsurl_unref(url);
		}
			break;

		case TOOLBAR_URL_SELECT_HOTLIST:
			ro_gui_window_action_add_bookmark(g);
			break;

		case TOOLBAR_URL_ADJUST_HOTLIST:
			ro_gui_window_action_remove_bookmark(g);
			break;

		case TOOLBAR_URL_SELECT_PGINFO:
		case TOOLBAR_URL_ADJUST_PGINFO:
			ro_gui_pageinfo_present(g);

		default:
			break;
		}

		return;
	}


	/* By now, the only valid action left is a button click.  If it isn't
	 * one of those, give up.
	 */

	if (action_type != TOOLBAR_ACTION_BUTTON)
		return;

	switch (action.button) {
	case TOOLBAR_BUTTON_BACK:
		if (g->bw != NULL)
			browser_window_history_back(g->bw, false);
		break;

	case TOOLBAR_BUTTON_BACK_NEW:
		if (g->bw != NULL)
			browser_window_history_back(g->bw, true);
		break;

	case TOOLBAR_BUTTON_FORWARD:
		if (g->bw != NULL)
			browser_window_history_forward(g->bw, false);
		break;

	case TOOLBAR_BUTTON_FORWARD_NEW:
		if (g->bw != NULL)
			browser_window_history_forward(g->bw, true);
		break;

	case TOOLBAR_BUTTON_STOP:
		if (g->bw != NULL)
			browser_window_stop(g->bw);
		break;

	case TOOLBAR_BUTTON_RELOAD:
		if (g->bw != NULL)
			browser_window_reload(g->bw, false);
		break;

	case TOOLBAR_BUTTON_RELOAD_ALL:
		if (g->bw != NULL)
			browser_window_reload(g->bw, true);
		break;

	case TOOLBAR_BUTTON_HISTORY_LOCAL:
		ro_gui_window_action_local_history(g);
		break;

	case TOOLBAR_BUTTON_HISTORY_GLOBAL:
		ro_gui_global_history_present();
		break;

	case TOOLBAR_BUTTON_HOME:
		ro_gui_window_action_home(g);
		break;

	case TOOLBAR_BUTTON_SEARCH:
		ro_gui_window_action_search(g);
		break;

	case TOOLBAR_BUTTON_SCALE:
		ro_gui_window_action_zoom(g);
		break;

	case TOOLBAR_BUTTON_BOOKMARK_OPEN:
		ro_gui_hotlist_present();
		break;

	case TOOLBAR_BUTTON_BOOKMARK_ADD:
		ro_gui_window_action_add_bookmark(g);
		break;

	case TOOLBAR_BUTTON_SAVE_SOURCE:
		ro_gui_window_action_save(g, GUI_SAVE_SOURCE);
		break;

	case TOOLBAR_BUTTON_SAVE_COMPLETE:
		ro_gui_window_action_save(g, GUI_SAVE_COMPLETE);
		break;

	case TOOLBAR_BUTTON_PRINT:
		ro_gui_window_action_print(g);
		break;

	case TOOLBAR_BUTTON_UP:
		err = browser_window_navigate_up(g->bw, false);
		if (err != NSERROR_OK) {
			ro_warn_user(messages_get_errorcode(err), NULL);
		}
		break;

	case TOOLBAR_BUTTON_UP_NEW:
		err = browser_window_navigate_up(g->bw, true);
		if (err != NSERROR_OK) {
			ro_warn_user(messages_get_errorcode(err), NULL);
		}
		break;

	default:
		break;
	}

	ro_gui_window_update_toolbar_buttons(g);
}


/**
 * Launch a new url in the given window.
 *
 * \param g gui_window to update
 * \param url1 url to be launched
 */
static void ro_gui_window_launch_url(struct gui_window *g, const char *url_s)
{
	nserror error;
	nsurl *url;

	if (url_s == NULL) {
		return;
	}

	ro_gui_url_complete_close();

	error = search_web_omni(url_s, SEARCH_WEB_OMNI_NONE, &url);
	if (error != NSERROR_OK) {
		ro_warn_user(messages_get_errorcode(error), 0);
	} else {
		ro_gui_window_set_url(g, url);

		browser_window_navigate(g->bw, url,
				NULL, BW_NAVIGATE_HISTORY,
				NULL, NULL, NULL);
		nsurl_unref(url);
	}
}


/**
 * Open a new browser window.
 *
 * \param g The browser window to act on.
 */
static void ro_gui_window_action_new_window(struct gui_window *g)
{
	nserror error;

	if (g == NULL || g->bw == NULL)
		return;

	error = browser_window_create(BW_CREATE_CLONE,
			browser_window_access_url(g->bw),
			NULL, g->bw, NULL);

	if (error != NSERROR_OK) {
		ro_warn_user(messages_get_errorcode(error), 0);
	}
}


/**
 * Scroll a browser window.
 *
 * the scroll is either via the core or directly using the normal
 * Wimp_OpenWindow interface.
 *
 * Scroll steps are supplied in terms of the (extended) Scroll Event direction
 * values returned by Wimp_Poll.  Special values of 0x7fffffff and 0x80000000
 * are added to mean "Home" and "End".
 *
 * \param g The GUI Window to be scrolled.
 * \param scroll_x The X scroll step to be applied.
 * \param scroll_y The Y scroll step to be applied.
 */
static void
ro_gui_window_scroll_action(struct gui_window *g,
			    wimp_scroll_direction scroll_x,
			    wimp_scroll_direction scroll_y)
{
	int			visible_x, visible_y;
	int			step_x = 0, step_y = 0;
	int			toolbar_y;
	wimp_window_state	state;
	wimp_pointer		pointer;
	os_error		*error;
	os_coord		pos;
	bool			handled = false;
	struct toolbar		*toolbar;

	if (g == NULL)
		return;

	/* Get the current window, toolbar and pointer details. */

	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_get_window_state: 0x%x: %s",
		      error->errnum, error->errmess);
		return;
	}

	toolbar = ro_toolbar_parent_window_lookup(g->window);
	assert(g == NULL || g->toolbar == NULL || g->toolbar == toolbar);

	toolbar_y = (toolbar == NULL) ? 0 : ro_toolbar_full_height(toolbar);

	visible_x = state.visible.x1 - state.visible.x0 - 32;
	visible_y = state.visible.y1 - state.visible.y0 - 32 - toolbar_y;

	error = xwimp_get_pointer_info(&pointer);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_get_pointer_info 0x%x : %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return;
	}

	/* Turn the scroll requirement from Scroll Event codes into coordinates
	 * that the core can understand.
	 */

	switch (scroll_x) {
	case wimp_SCROLL_PAGE_LEFT:
		step_x = SCROLL_PAGE_DOWN;
		break;
	case wimp_SCROLL_AUTO_LEFT:
	case wimp_SCROLL_COLUMN_LEFT:
		step_x = -16;
		break;
	case wimp_SCROLL_AUTO_RIGHT:
	case wimp_SCROLL_COLUMN_RIGHT:
		step_x = 16;
		break;
	case wimp_SCROLL_PAGE_RIGHT:
		step_x = SCROLL_PAGE_UP;
		break;
	case 0x80000000:
		step_x = SCROLL_BOTTOM;
		break;
	case 0x7fffffff:
		step_x = SCROLL_TOP;
		break;
	default:
		step_x = (32 * (scroll_x / 4));
		break;
	}

	switch (scroll_y) {
	case wimp_SCROLL_PAGE_UP:
		step_y = SCROLL_PAGE_UP;
		break;
	case wimp_SCROLL_AUTO_UP:
	case wimp_SCROLL_LINE_UP:
		step_y = -16;
		break;
	case wimp_SCROLL_AUTO_DOWN:
	case wimp_SCROLL_LINE_DOWN:
		step_y = 16;
		break;
	case wimp_SCROLL_PAGE_DOWN:
		step_y = SCROLL_PAGE_DOWN;
		break;
	case 0x80000000:
		step_y = SCROLL_BOTTOM;
		break;
	case 0x7fffffff:
		step_y = SCROLL_TOP;
		break;
	default:
		step_y = -(32 * (scroll_y / 4));
		break;
	}

	/* If no scrolling is required, there's no point trying to do any. */

	if (step_x == 0 && step_y == 0)
		return;

	/* If the pointer is over the window being scrolled, then try to get
	 * the core to do the scrolling on the object under the pointer.
	 */

	if (pointer.w == g->window &&
	    ro_gui_window_to_window_pos(g, pointer.pos.x, pointer.pos.y, &pos))
		handled = browser_window_scroll_at_point(g->bw,
							 pos.x,
							 pos.y,
							 step_x,
							 step_y);

	/* If the core didn't do the scrolling, handle it via the Wimp.
	 * Windows which contain frames can only be scrolled by the core,
	 * because it implements frame scroll bars.
	 */

	if (!handled && (browser_window_is_frameset(g->bw) == false)) {
		switch (step_x) {
		case SCROLL_TOP:
			state.xscroll -= 0x10000000;
			break;
		case SCROLL_BOTTOM:
			state.xscroll += 0x10000000;
			break;
		case SCROLL_PAGE_UP:
			state.xscroll += visible_x;
			break;
		case SCROLL_PAGE_DOWN:
			state.xscroll -= visible_x;
			break;
		default:
			state.xscroll += 2 * step_x;
			break;
		}

		switch (step_y) {
		case SCROLL_TOP:
			state.yscroll += 0x10000000;
			break;
		case SCROLL_BOTTOM:
			state.yscroll -= 0x10000000;
			break;
		case SCROLL_PAGE_UP:
			state.yscroll += visible_y;
			break;
		case SCROLL_PAGE_DOWN:
			state.yscroll -= visible_y;
			break;
		default:
			state.yscroll -= 2 * step_y;
			break;
		}

		error = xwimp_open_window((wimp_open *) &state);
		if (error) {
			NSLOG(netsurf, INFO, "xwimp_open_window: 0x%x: %s",
			      error->errnum, error->errmess);
		}
	}
}

/**
 * handle scale kepresses within RISC OS
 */
static bool handle_local_keypress_scale(struct gui_window *gw, uint32_t c)
{
	float cscale; /* current scale */
	float scale; /* new scale */

	cscale = browser_window_get_scale(gw->bw);

	scale = cscale;

	if (ro_gui_shift_pressed() && c == 17) {
		scale = cscale - 0.1;
	} else if (ro_gui_shift_pressed() && c == 23) {
		scale = cscale + 0.1;
	} else if (c == 17) {
		for (int i = SCALE_SNAP_TO_SIZE - 1; i >= 0; i--) {
			if (scale_snap_to[i] < cscale) {
				scale = scale_snap_to[i];
				break;
			}
		}
	} else {
		for (unsigned int i = 0; i < SCALE_SNAP_TO_SIZE; i++) {
			if (scale_snap_to[i] > cscale) {
				scale = scale_snap_to[i];
				break;
			}
		}
	}

	if (scale < scale_snap_to[0]) {
		scale = scale_snap_to[0];
	}

	if (scale > scale_snap_to[SCALE_SNAP_TO_SIZE - 1]) {
		scale = scale_snap_to[SCALE_SNAP_TO_SIZE - 1];
	}

	if (cscale != scale) {
		ro_gui_window_set_scale(gw, scale);
	}

	return true;
}

/**
 * Handle keypresses within the RISC OS GUI
 *
 * this is to be called after the core has been given a chance to act,
 * or on keypresses in the toolbar where the core doesn't get
 * involved.
 *
 * \param *g         The gui window to which the keypress applies.
 * \param *key	     The keypress data.
 * \param is_toolbar true if the keypress is from a toolbar else false.
 * \return true if the keypress was claimed; else false.
 */
static bool
ro_gui_window_handle_local_keypress(struct gui_window *g,
				    wimp_key *key,
				    bool is_toolbar)
{
	struct browser_window_features cont;
	os_error			*ro_error;
	wimp_pointer			pointer;
	os_coord			pos;
	uint32_t			c = (uint32_t) key->c;
	wimp_scroll_direction		xscroll = wimp_SCROLL_NONE;
	wimp_scroll_direction		yscroll = wimp_SCROLL_NONE;
	nsurl				*url;

	if (g == NULL)
		return false;

	ro_error = xwimp_get_pointer_info(&pointer);
	if (ro_error) {
		NSLOG(netsurf, INFO, "xwimp_get_pointer_info: 0x%x: %s\n",
		      ro_error->errnum, ro_error->errmess);
		ro_warn_user("WimpError", ro_error->errmess);
		return false;
	}

	if (!ro_gui_window_to_window_pos(g, pointer.pos.x, pointer.pos.y, &pos))
		return false;

	browser_window_get_features(g->bw, pos.x, pos.y, &cont);

	switch (c) {
	case IS_WIMP_KEY + wimp_KEY_F1:	/* Help. */
	{
		nserror error = nsurl_create(
				"http://www.netsurf-browser.org/documentation/",
				&url);
		if (error == NSERROR_OK) {
			error = browser_window_create(BW_CREATE_HISTORY,
					url,
					NULL,
					NULL,
					NULL);
			nsurl_unref(url);
		}
		if (error != NSERROR_OK) {
			ro_warn_user(messages_get_errorcode(error), 0);
		}
		return true;
	}
	case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_F1:
		ro_gui_window_action_page_info(g);
		return true;

	case IS_WIMP_KEY + wimp_KEY_F2:
		if (g->toolbar == NULL)
			return false;
		ro_gui_url_complete_close();
		ro_toolbar_set_url(g->toolbar, "www.", true, true);
		ro_gui_url_complete_start(g->toolbar);
		ro_gui_url_complete_keypress(g->toolbar, wimp_KEY_DOWN);
		return true;

	case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_F2:
		/* Close window. */
		ro_gui_url_complete_close();
		gui_window_set_pointer(g, GUI_POINTER_DEFAULT);
		browser_window_destroy(g->bw);
		return true;

	case 19:		/* Ctrl + S */
	case IS_WIMP_KEY + wimp_KEY_F3:
		ro_gui_window_action_save(g, GUI_SAVE_SOURCE);
		return true;

	case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_F3:
		ro_gui_window_action_save(g, GUI_SAVE_TEXT);
		return true;

	case IS_WIMP_KEY + wimp_KEY_SHIFT + wimp_KEY_F3:
		ro_gui_window_action_save(g, GUI_SAVE_COMPLETE);
		return true;

	case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_SHIFT + wimp_KEY_F3:
		ro_gui_window_action_save(g, GUI_SAVE_DRAW);
		return true;

	case 6:			/* Ctrl + F */
	case IS_WIMP_KEY + wimp_KEY_F4:	/* Search */
		ro_gui_window_action_search(g);
		return true;

	case IS_WIMP_KEY + wimp_KEY_F5:	/* Reload */
		if (g->bw != NULL)
			browser_window_reload(g->bw, false);
		return true;

	case 18:		/* Ctrl+R (Full reload) */
	case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_F5:
		if (g->bw != NULL)
			browser_window_reload(g->bw, true);
		return true;

	case IS_WIMP_KEY + wimp_KEY_F6:	/* Hotlist */
		ro_gui_hotlist_present();
		return true;

	case IS_WIMP_KEY + wimp_KEY_F7:	/* Show local history */
		ro_gui_window_action_local_history(g);
		return true;

	case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_F7:
		/* Show global history */
		ro_gui_global_history_present();
		return true;

	case IS_WIMP_KEY + wimp_KEY_F8:	/* View source */
		ro_gui_view_source((cont.main != NULL) ? cont.main :
				browser_window_get_content(g->bw));
		return true;

	case IS_WIMP_KEY + wimp_KEY_F9:
		/* Dump content for debugging. */
		ro_gui_dump_browser_window(g->bw);
		return true;

	case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_F9:
		urldb_dump();
		return true;

	case IS_WIMP_KEY + wimp_KEY_CONTROL + wimp_KEY_SHIFT + wimp_KEY_F9:
		talloc_report_full(0, stderr);
		return true;

	case IS_WIMP_KEY + wimp_KEY_F11:	/* Zoom */
		ro_gui_window_action_zoom(g);
		return true;

	case IS_WIMP_KEY + wimp_KEY_SHIFT + wimp_KEY_F11:
		/* Toggle display of box outlines. */
		browser_window_debug(g->bw, CONTENT_DEBUG_REDRAW);

		ro_gui_window_invalidate_area(g, NULL);
		return true;

	case wimp_KEY_RETURN:
		if (is_toolbar) {
			const char *toolbar_url;
			toolbar_url = ro_toolbar_get_url(g->toolbar);
			ro_gui_window_launch_url(g, toolbar_url);
		}
		return true;

	case wimp_KEY_ESCAPE:
		if (ro_gui_url_complete_close()) {
			ro_gui_url_complete_start(g->toolbar);
			return true;
		}

		if (g->bw != NULL)
			browser_window_stop(g->bw);
		return true;

	case 14:	/* CTRL+N */
		ro_gui_window_action_new_window(g);
		return true;

	case 17:       /* CTRL+Q (Zoom out) */
	case 23:       /* CTRL+W (Zoom in) */
		if (browser_window_has_content(g->bw) == true) {
			return handle_local_keypress_scale(g, c);
		}
		break;

	case IS_WIMP_KEY + wimp_KEY_PRINT:
		ro_gui_window_action_print(g);
		return true;

	case IS_WIMP_KEY | wimp_KEY_LEFT:
	case IS_WIMP_KEY | wimp_KEY_RIGHT:
	case IS_WIMP_KEY | wimp_KEY_CONTROL | wimp_KEY_LEFT:
	case IS_WIMP_KEY | wimp_KEY_CONTROL | wimp_KEY_RIGHT:
	case IS_WIMP_KEY | wimp_KEY_UP:
	case IS_WIMP_KEY | wimp_KEY_DOWN:
	case IS_WIMP_KEY | wimp_KEY_PAGE_UP:
	case IS_WIMP_KEY | wimp_KEY_PAGE_DOWN:
	case wimp_KEY_HOME:
	case IS_WIMP_KEY | wimp_KEY_CONTROL | wimp_KEY_UP:
	case IS_WIMP_KEY | wimp_KEY_END:
	case IS_WIMP_KEY | wimp_KEY_CONTROL | wimp_KEY_DOWN:
		if (is_toolbar)
			return false;
		break;
	default:
		return false; /* This catches any keys we don't want to claim */
	}

	/* Any keys that exit from the above switch() via break should be
	 * processed as scroll actions in the browser window. */

	switch (c) {
	case IS_WIMP_KEY | wimp_KEY_LEFT:
		xscroll = wimp_SCROLL_COLUMN_LEFT;
		break;
	case IS_WIMP_KEY | wimp_KEY_RIGHT:
		xscroll = wimp_SCROLL_COLUMN_RIGHT;
		break;
	case IS_WIMP_KEY | wimp_KEY_CONTROL | wimp_KEY_LEFT:
		xscroll = 0x7fffffff;
		break;
	case IS_WIMP_KEY | wimp_KEY_CONTROL | wimp_KEY_RIGHT:
		xscroll = 0x80000000;
		break;
	case IS_WIMP_KEY | wimp_KEY_UP:
		yscroll = wimp_SCROLL_LINE_UP;
		break;
	case IS_WIMP_KEY | wimp_KEY_DOWN:
		yscroll = wimp_SCROLL_LINE_DOWN;
		break;
	case IS_WIMP_KEY | wimp_KEY_PAGE_UP:
		yscroll = wimp_SCROLL_PAGE_UP;
		break;
	case IS_WIMP_KEY | wimp_KEY_PAGE_DOWN:
		yscroll = wimp_SCROLL_PAGE_DOWN;
		break;
	case wimp_KEY_HOME:
	case IS_WIMP_KEY | wimp_KEY_CONTROL | wimp_KEY_UP:
		yscroll = 0x7fffffff;
		break;
	case IS_WIMP_KEY | wimp_KEY_END:
	case IS_WIMP_KEY | wimp_KEY_CONTROL | wimp_KEY_DOWN:
		yscroll = 0x80000000;
		break;
	}

	ro_gui_window_scroll_action(g, xscroll, yscroll);

	return true;
}


/**
 * Callback handler for keypresses within browser window toolbars.
 *
 * \param data Client data, pointing to the GUI Window.
 * \param key The keypress data.
 * \return true if the keypress was handled; else false.
 */
static bool ro_gui_window_toolbar_keypress(void *data, wimp_key *key)
{
	struct gui_window *g = (struct gui_window *) data;

	if (g != NULL) {
		return ro_gui_window_handle_local_keypress(g, key, true);
	}

	return false;
}


/**
 * Save a new toolbar button configuration
 *
 * used as a callback by the toolbar module when a buttonbar edit has
 * finished.
 *
 * \param data void pointer to the window's gui_window struct
 * \param config pointer to a malloc()'d button config string.
 */
static void ro_gui_window_save_toolbar_buttons(void *data, char *config)
{
	nsoption_set_charp(toolbar_browser, config);
	ro_gui_save_options();
}


/**
 * toolbar callbacks for a browser window.
 */
static const struct toolbar_callbacks ro_gui_window_toolbar_callbacks = {
	ro_gui_window_update_theme,
	ro_gui_window_update_toolbar,
	(void (*)(void *)) ro_gui_window_update_toolbar_buttons,
	ro_gui_window_toolbar_click,
	ro_gui_window_toolbar_keypress,
	ro_gui_window_save_toolbar_buttons
};


/**
 * Handle wimp closing event
 *
 * \param w The window handle the event occoured on
 */
static void ro_gui_window_close(wimp_w w)
{
	struct gui_window *g;
	wimp_pointer pointer;
	os_error *error;
	char *temp_name;
	char *filename = NULL;
	struct nsurl *url;
	bool destroy;

	error = xwimp_get_pointer_info(&pointer);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_get_pointer_info: 0x%x: %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return;
	}

	g = (struct gui_window *)ro_gui_wimp_event_get_user_data(w);

	if (pointer.buttons & wimp_CLICK_ADJUST) {
		destroy = !ro_gui_shift_pressed();

		url = browser_window_access_url(g->bw);
		if (url != NULL) {
			netsurf_nsurl_to_path(url, &filename);
		}
		if (filename != NULL) {
			temp_name = malloc(strlen(filename) + 32);
			if (temp_name) {
				char *r;
				sprintf(temp_name, "Filer_OpenDir %s",
						filename);
				r = temp_name + strlen(temp_name);
				while (r > temp_name) {
					if (*r == '.') {
						*r = '\0';
						break;
					}
					r--;
				}
				error = xos_cli(temp_name);
				if (error) {
					NSLOG(netsurf, INFO,
					      "xos_cli: 0x%x: %s",
					      error->errnum,
					      error->errmess);
					ro_warn_user("MiscError", error->errmess);
					return;
				}
				free(temp_name);
			}
			free(filename);
		} else {
			/* this is pointless if we are about to close the
			 * window */
			if (!destroy && url != NULL)
				browser_window_navigate_up(g->bw, false);
		}
	} else {
		destroy = true;
	}

	if (destroy) {
		browser_window_destroy(g->bw);
	}
}


/**
 * Handle a Redraw_Window_Request for a browser window.
 *
 * \param redraw The redraw event
 */
static void ro_gui_window_redraw(wimp_draw *redraw)
{
	osbool more;
	struct gui_window *g;
	os_error *error;
	struct redraw_context ctx = {
		.interactive = true,
		.background_images = true,
		.plot = &ro_plotters
	};

	g = (struct gui_window *)ro_gui_wimp_event_get_user_data(redraw->w);

	/* We cannot render locked contents.  If the browser window is not
	 * ready for redraw, do nothing.  Else, in the case of buffered
	 * rendering we'll show random data. */
	if (!browser_window_redraw_ready(g->bw)) {
		return;
	}

	ro_gui_current_redraw_gui = g;

	error = xwimp_redraw_window(redraw, &more);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_redraw_window: 0x%x: %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return;
	}
	while (more) {
		struct rect clip;

		/* OS's redraw request coordinates are in screen coordinates,
		 * with an origin at the bottom left of the screen.
		 * Find the coordinate of the top left of the document in terms
		 * of OS screen coordinates.
		 * NOTE: OS units are 2 per px. */
		ro_plot_origin_x = redraw->box.x0 - redraw->xscroll;
		ro_plot_origin_y = redraw->box.y1 - redraw->yscroll;

		/* Convert OS redraw rectangle request coordinates into NetSurf
		 * coordinates. NetSurf coordinates have origin at top left of
		 * document and units are in px. */
		clip.x0 = (redraw->clip.x0 - ro_plot_origin_x) / 2; /* left   */
		clip.y0 = (ro_plot_origin_y - redraw->clip.y1) / 2; /* top    */
		clip.x1 = (redraw->clip.x1 - ro_plot_origin_x) / 2; /* right  */
		clip.y1 = (ro_plot_origin_y - redraw->clip.y0) / 2; /* bottom */

		if (ro_gui_current_redraw_gui->option.buffer_everything)
			ro_gui_buffer_open(redraw);

		browser_window_redraw(g->bw, 0, 0, &clip, &ctx);

		if (ro_gui_current_redraw_gui->option.buffer_everything)
			ro_gui_buffer_close();

		/* Check to see if there are more rectangles to draw and
		 * get next one */
		error = xwimp_get_rectangle(redraw, &more);
		/* RISC OS 3.7 returns an error here if enough buffer was
		   claimed to cause a new dynamic area to be created. It
		   doesn't actually stop anything working, so we mask it out
		   for now until a better fix is found. This appears to be a
		   bug in RISC OS. */
		if (error && !(ro_gui_current_redraw_gui->
				option.buffer_everything &&
				error->errnum == error_WIMP_GET_RECT)) {
			NSLOG(netsurf, INFO, "xwimp_get_rectangle: 0x%x: %s",
			      error->errnum, error->errmess);
			ro_warn_user("WimpError", error->errmess);
			ro_gui_current_redraw_gui = NULL;
			return;
		}
	}
	ro_gui_current_redraw_gui = NULL;
}


/**
 * Process Scroll_Request events in a browser window.
 *
 * \param scroll The wimp scroll event data block.
 */
static void ro_gui_window_scroll(wimp_scroll *scroll)
{
	float cscale, scale, inc;
	struct gui_window *g = ro_gui_window_lookup(scroll->w);

	if (g == NULL) {
		return;
	}

	if ((browser_window_has_content(g->bw) == false) ||
	    (ro_gui_shift_pressed() == false)) {
		ro_gui_window_scroll_action(g, scroll->xmin, scroll->ymin);
		return;
	}

	/* extended scroll request with shift held down; change zoom */
	cscale = browser_window_get_scale(g->bw);

	if (scroll->ymin & 3) {
		inc = 0.02;  /* RO5 sends the msg 5 times;
			      * don't ask me why
			      *
			      * @todo this is liable to break if
			      * HID is configured optimally for
			      * frame scrolling. *5 appears to be
			      * an artifact of non-HID mode scrolling.
			      */
	} else {
		inc = (1 << (ABS(scroll->ymin)>>2)) / 20.0F;
	}

	if (scroll->ymin > 0) {
		scale = cscale + inc;
		if (scale > scale_snap_to[SCALE_SNAP_TO_SIZE - 1]) {
			scale = scale_snap_to[SCALE_SNAP_TO_SIZE - 1];
		}
	} else {
		scale = cscale - inc;
		if (scale < scale_snap_to[0]) {
			scale = scale_snap_to[0];
		}
	}
	if (scale != cscale) {
		ro_gui_window_set_scale(g, scale);
	}
}


/**
 * Process Pointer Leaving Window events in a browser window.
 *
 * These arrive via the termination callback handler from ro_mouse's
 * mouse tracking.
 *
 * \param leaving The wimp pointer leaving event data block.
 * \param data The GUI window that the pointer is leaving.
 */
static void ro_gui_window_track_end(wimp_leaving *leaving, void *data)
{
	struct gui_window *g = (struct gui_window *)data;

	if (g != NULL) {
		gui_window_set_pointer(g, GUI_POINTER_DEFAULT);
	}
}


/**
 * Process Pointer Entering Window events in a browser window.
 *
 * \param entering The wimp pointer entering event data block.
 */
static void ro_gui_window_pointer_entering(wimp_entering *entering)
{
	struct gui_window *g = ro_gui_window_lookup(entering->w);

	if (g != NULL) {
		ro_mouse_track_start(ro_gui_window_track_end,
				     ro_gui_window_mouse_at,
				     g);
	}
}


/**
 * Process Key_Pressed events in a browser window.
 *
 * \param key The wimp keypress block for the event.
 * \return true if the event was handled, else false.
 */
static bool ro_gui_window_keypress(wimp_key *key)
{
	struct gui_window *g;
	uint32_t c = (uint32_t) key->c;

	g = (struct gui_window *) ro_gui_wimp_event_get_user_data(key->w);
	if (g == NULL) {
		return false;
	}

	/* First send the key to the browser window, eg. form fields. */

	if ((unsigned)c < 0x20 ||
	    (0x7f <= c && c <= 0x9f) ||
	    (c & IS_WIMP_KEY)) {
		/* Munge control keys into unused control chars */
		/* We can't map onto 1->26 (reserved for ctrl+<qwerty>
		   That leaves 27->31 and 128->159 */
		switch (c & ~IS_WIMP_KEY) {
		case wimp_KEY_TAB:
			c = 9;
			break;

		case wimp_KEY_SHIFT | wimp_KEY_TAB:
			c = 11;
			break;

			/* cursor movement keys */
		case wimp_KEY_HOME:
		case wimp_KEY_CONTROL | wimp_KEY_LEFT:
			c = NS_KEY_LINE_START;
			break;

		case wimp_KEY_END:
			if (os_version >= RISCOS5) {
				c = NS_KEY_LINE_END;
			} else {
				c = NS_KEY_DELETE_RIGHT;
			}
			break;

		case wimp_KEY_CONTROL | wimp_KEY_RIGHT:
			c = NS_KEY_LINE_END;
			break;

		case wimp_KEY_CONTROL | wimp_KEY_UP:
			c = NS_KEY_TEXT_START;
			break;

		case wimp_KEY_CONTROL | wimp_KEY_DOWN:
			c = NS_KEY_TEXT_END;
			break;

		case wimp_KEY_SHIFT | wimp_KEY_LEFT:
			c = NS_KEY_WORD_LEFT ;
			break;

		case wimp_KEY_SHIFT | wimp_KEY_RIGHT:
			c = NS_KEY_WORD_RIGHT;
			break;

		case wimp_KEY_SHIFT | wimp_KEY_UP:
			c = NS_KEY_PAGE_UP;
			break;

		case wimp_KEY_SHIFT | wimp_KEY_DOWN:
			c = NS_KEY_PAGE_DOWN;
			break;

		case wimp_KEY_LEFT:
			c = NS_KEY_LEFT;
			break;

		case wimp_KEY_RIGHT:
			c = NS_KEY_RIGHT;
			break;

		case wimp_KEY_UP:
			c = NS_KEY_UP;
			break;

		case wimp_KEY_DOWN:
			c = NS_KEY_DOWN;
			break;

			/* editing */
		case wimp_KEY_CONTROL | wimp_KEY_END:
			c = NS_KEY_DELETE_LINE_END;
			break;

		case wimp_KEY_DELETE:
			if (ro_gui_ctrl_pressed()) {
				c = NS_KEY_DELETE_LINE_START;
			} else if (os_version < RISCOS5) {
				c = NS_KEY_DELETE_LEFT;
			}
			break;

		case wimp_KEY_F8:
			c = NS_KEY_UNDO;
			break;

		case wimp_KEY_F9:
			c = NS_KEY_REDO;
			break;

		default:
			break;
		}
	}

	if (!(c & IS_WIMP_KEY)) {
		if (browser_window_key_press(g->bw, c)) {
			return true;
		}
	}

	return ro_gui_window_handle_local_keypress(g, key, false);
}


/**
 * Handle Mouse_Click events in a browser window.
 *
 *  This should never see Menu clicks, as these will be routed to the
 * menu handlers.
 *
 * \param pointer details of mouse click
 * \return true if click handled, false otherwise
 */
static bool ro_gui_window_click(wimp_pointer *pointer)
{
	struct gui_window *g;
	os_coord pos;

	/* We should never see Menu clicks. */

	if (pointer->buttons == wimp_CLICK_MENU) {
		return false;
	}

	g = (struct gui_window *) ro_gui_wimp_event_get_user_data(pointer->w);

	/* try to close url-completion */
	ro_gui_url_complete_close();

	/* set input focus */
	if (pointer->buttons & (wimp_SINGLE_SELECT | wimp_SINGLE_ADJUST))
		gui_window_place_caret(g, -100, -100, 0, NULL);

	if (ro_gui_window_to_window_pos(g, pointer->pos.x, pointer->pos.y, &pos)) {
		browser_window_mouse_click(g->bw,
				ro_gui_mouse_click_state(pointer->buttons,
				wimp_BUTTON_DOUBLE_CLICK_DRAG),
				pos.x, pos.y);
	}

	return true;
}


/**
 * Prepare or reprepare a form select menu
 *
 * setting up the menu handle globals in the process.
 *
 * \param g The RISC OS gui window the menu is in.
 * \param control  The form control needing a menu.
 * \return true if the menu is OK to be opened; else false.
 */
static bool
ro_gui_window_prepare_form_select_menu(struct gui_window *g,
				       struct form_control *control)
{
	unsigned int item, entries;
	char *text_convert, *temp;
	struct form_option *option;
	bool reopen = true;
	nserror err;

	assert(control);

	/* enumerate the entries */
	entries = 0;
	option = form_select_get_option(control, entries);
	while (option != NULL) {
		entries++;
		option = form_select_get_option(control, entries);
	}

	if (entries == 0) {
		/* no menu to display */
		ro_gui_menu_destroy();
		return false;
	}

	/* free riscos menu if there already is one */
	if ((gui_form_select_menu) && (control != gui_form_select_control)) {
		for (item = 0; ; item++) {
			free(gui_form_select_menu->entries[item].data.
					indirected_text.text);
			if (gui_form_select_menu->entries[item].menu_flags &
					wimp_MENU_LAST)
				break;
		}
		free(gui_form_select_menu->title_data.indirected_text.text);
		free(gui_form_select_menu);
		gui_form_select_menu = 0;
	}

	/* allocate new riscos menu */
	if (!gui_form_select_menu) {
		reopen = false;
		gui_form_select_menu = malloc(wimp_SIZEOF_MENU(entries));
		if (!gui_form_select_menu) {
			ro_warn_user("NoMemory", 0);
			ro_gui_menu_destroy();
			return false;
		}
		err = utf8_to_local_encoding(messages_get("SelectMenu"), 0,
				&text_convert);
		if (err != NSERROR_OK) {
			/* badenc should never happen */
			assert(err != NSERROR_BAD_ENCODING);
			NSLOG(netsurf, INFO, "utf8_to_local_encoding failed");
			ro_warn_user("NoMemory", 0);
			ro_gui_menu_destroy();
			return false;
		}
		gui_form_select_menu->title_data.indirected_text.text =
				text_convert;
		ro_gui_menu_init_structure(gui_form_select_menu, entries);
	}

	/* initialise menu entries from form control */
	for (item = 0; item < entries; item++) {
		option = form_select_get_option(control, item);
		gui_form_select_menu->entries[item].menu_flags = 0;
		if (option->selected)
			gui_form_select_menu->entries[item].menu_flags =
					wimp_MENU_TICKED;
		if (!reopen) {

			/* convert spaces to hard spaces to stop things
			 * like 'Go Home' being treated as if 'Home' is a
			 * keyboard shortcut and right aligned in the menu.
			 */

			temp = cnv_space2nbsp(option->text);
			if (!temp) {
				NSLOG(netsurf, INFO, "cnv_space2nbsp failed");
				ro_warn_user("NoMemory", 0);
				ro_gui_menu_destroy();
				return false;
			}

			err = utf8_to_local_encoding(temp,
				0, &text_convert);
			if (err != NSERROR_OK) {
				/* A bad encoding should never happen,
				 * so assert this */
				assert(err != NSERROR_BAD_ENCODING);
				NSLOG(netsurf, INFO, "utf8_to_enc failed");
				ro_warn_user("NoMemory", 0);
				ro_gui_menu_destroy();
				return false;
			}

			free(temp);

			gui_form_select_menu->entries[item].data.indirected_text.text =
					text_convert;
			gui_form_select_menu->entries[item].data.indirected_text.size =
					strlen(gui_form_select_menu->entries[item].
					data.indirected_text.text) + 1;
		}
	}

	gui_form_select_menu->entries[0].menu_flags |=
			wimp_MENU_TITLE_INDIRECTED;
	gui_form_select_menu->entries[item - 1].menu_flags |= wimp_MENU_LAST;

	return true;
}


/**
 * Return boolean flags to show what RISC OS types we can sensibly convert
 * the given object into.
 *
 * \todo This should probably be somewhere else but in window.c, and
 * should probably even be done in content_().
 *
 * \param h The object to test.
 * \param export_draw true on exit if a drawfile would be possible.
 * \param export_sprite true on exit if a sprite would be possible.
 * \return true if valid data is returned; else false.
 */
static bool
ro_gui_window_content_export_types(struct hlcache_handle *h,
				   bool *export_draw,
				   bool *export_sprite)
{
	bool found_type = false;

	if (export_draw != NULL) {
		*export_draw = false;
	}
	if (export_sprite != NULL) {
		*export_sprite = false;
	}

	if (h != NULL && content_get_type(h) == CONTENT_IMAGE) {
		switch (ro_content_native_type(h)) {
		case osfile_TYPE_SPRITE:
			/* bitmap types (Sprite export possible) */
			found_type = true;
			if (export_sprite != NULL) {
				*export_sprite = true;
			}
			break;

		case osfile_TYPE_DRAW:
			/* vector types (Draw export possible) */
			found_type = true;
			if (export_draw != NULL) {
				*export_draw = true;
			}
			break;

		default:
			break;
		}
	}

	return found_type;
}


/**
 * Prepare the browser window menu for (re-)opening
 *
 * \param w The window owning the menu.
 * \param i The icon owning the menu.
 * \param menu The menu about to be opened.
 * \param pointer Pointer to the relevant wimp event block, or
 *		    NULL for an Adjust click.
 * \return true if the event was handled; else false.
 */
static bool
ro_gui_window_menu_prepare(wimp_w w,
			   wimp_i i,
			   wimp_menu *menu,
			   wimp_pointer *pointer)
{
	struct gui_window	*g;
	struct browser_window	*bw;
	struct toolbar		*toolbar;
	struct browser_window_features cont;
	bool			export_sprite, export_draw, have_content;
	os_coord		pos;
	browser_editor_flags	editor_flags;

	g = (struct gui_window *) ro_gui_wimp_event_get_user_data(w);
	toolbar = g->toolbar;
	bw = g->bw;
	have_content = browser_window_has_content(g->bw);
	editor_flags = browser_window_get_editor_flags(bw);

	/* If this is the form select menu, handle it now and then exit.
	 * Otherwise, carry on to the main browser window menu.
	 */

	if (menu == gui_form_select_menu) {
		return ro_gui_window_prepare_form_select_menu(g,
				gui_form_select_control);
	}

	if (menu != ro_gui_browser_window_menu) {
		return false;
	}

	/* If this is a new opening for the browser window menu (ie. not for a
	 * toolbar menu), get details of the object under the pointer.
	 */
	if (pointer != NULL && g->window == w) {
		ro_gui_url_complete_close();

		current_menu_main = NULL;
		current_menu_object = NULL;
		current_menu_url = NULL;

		if (ro_gui_window_to_window_pos(g, pointer->pos.x,
				pointer->pos.y, &pos)) {
			browser_window_get_features(bw,	pos.x, pos.y, &cont);

			current_menu_main = cont.main;
			current_menu_object = cont.object;
			current_menu_url = cont.link;
		}
	}

	/* Shade menu entries according to the state of the window and object
	 * under the pointer.
	 */

	/* Toolbar (Sub)Menu */

	ro_gui_menu_set_entry_shaded(menu, TOOLBAR_BUTTONS,
			ro_toolbar_menu_option_shade(toolbar));
	ro_gui_menu_set_entry_ticked(menu, TOOLBAR_BUTTONS,
			ro_toolbar_menu_buttons_tick(toolbar));

	ro_gui_menu_set_entry_shaded(menu, TOOLBAR_ADDRESS_BAR,
			ro_toolbar_menu_edit_shade(toolbar));
	ro_gui_menu_set_entry_ticked(menu, TOOLBAR_ADDRESS_BAR,
			ro_toolbar_menu_url_tick(toolbar));

	ro_gui_menu_set_entry_shaded(menu, TOOLBAR_THROBBER,
			ro_toolbar_menu_edit_shade(toolbar));
	ro_gui_menu_set_entry_ticked(menu, TOOLBAR_THROBBER,
			ro_toolbar_menu_throbber_tick(toolbar));

	ro_gui_menu_set_entry_shaded(menu, TOOLBAR_EDIT,
			ro_toolbar_menu_edit_shade(toolbar));
	ro_gui_menu_set_entry_ticked(menu, TOOLBAR_EDIT,
			ro_toolbar_menu_edit_tick(toolbar));

	/* Page Submenu */

	ro_gui_menu_set_entry_shaded(menu, BROWSER_PAGE,
			!browser_window_can_search(bw));

	ro_gui_menu_set_entry_shaded(menu, BROWSER_PAGE_INFO, !have_content);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_PRINT, !have_content);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_NEW_WINDOW, !have_content);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_FIND_TEXT,
			!browser_window_can_search(bw));


	ro_gui_menu_set_entry_shaded(menu, BROWSER_VIEW_SOURCE, !have_content);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_SAVE_URL_URI, !have_content);
	ro_gui_menu_set_entry_shaded(menu, BROWSER_SAVE_URL_URL, !have_content);
	ro_gui_menu_set_entry_shaded(menu, BROWSER_SAVE_URL_TEXT,
			!have_content);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_SAVE, !have_content);
	ro_gui_menu_set_entry_shaded(menu, BROWSER_SAVE_COMPLETE,
			!have_content);
	ro_gui_menu_set_entry_shaded(menu, BROWSER_EXPORT_DRAW, !have_content);
	ro_gui_menu_set_entry_shaded(menu, BROWSER_EXPORT_PDF, !have_content);
	ro_gui_menu_set_entry_shaded(menu, BROWSER_EXPORT_TEXT, !have_content);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_LINK_SAVE_URI,
			!current_menu_url);
	ro_gui_menu_set_entry_shaded(menu, BROWSER_LINK_SAVE_URL,
			!current_menu_url);
	ro_gui_menu_set_entry_shaded(menu, BROWSER_LINK_SAVE_TEXT,
			!current_menu_url);



	/* Object Submenu */

	ro_gui_menu_set_entry_shaded(menu, BROWSER_OBJECT,
			current_menu_object == NULL &&
			current_menu_url == NULL);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_OBJECT_LINK,
			current_menu_url == NULL);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_OBJECT_INFO,
			current_menu_object == NULL);
	ro_gui_menu_set_entry_shaded(menu, BROWSER_OBJECT_RELOAD,
			current_menu_object == NULL);
	ro_gui_menu_set_entry_shaded(menu, BROWSER_OBJECT_OBJECT,
			current_menu_object == NULL);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_OBJECT_PRINT, true);
			/* Not yet implemented */

	ro_gui_menu_set_entry_shaded(menu, BROWSER_OBJECT_SAVE,
			current_menu_object == NULL);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_OBJECT_SAVE_URL_URI,
			current_menu_object == NULL);
	ro_gui_menu_set_entry_shaded(menu, BROWSER_OBJECT_SAVE_URL_URL,
			current_menu_object == NULL);
	ro_gui_menu_set_entry_shaded(menu, BROWSER_OBJECT_SAVE_URL_TEXT,
			current_menu_object == NULL);

	if (current_menu_object != NULL) {
		ro_gui_window_content_export_types(current_menu_object,
				&export_draw, &export_sprite);
	} else {
		ro_gui_window_content_export_types(
				browser_window_get_content(bw),
				&export_draw, &export_sprite);
	}

	ro_gui_menu_set_entry_shaded(menu, BROWSER_OBJECT_EXPORT,
			(!have_content && current_menu_object == NULL)
				|| !(export_sprite || export_draw));

	ro_gui_menu_set_entry_shaded(menu, BROWSER_OBJECT_EXPORT_SPRITE,
			(!have_content && current_menu_object == NULL)
				|| !export_sprite);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_OBJECT_EXPORT_DRAW,
			(!have_content && current_menu_object == NULL)
				|| !export_draw);


	/* Selection Submenu */

	ro_gui_menu_set_entry_shaded(menu, BROWSER_SELECTION,
			!browser_window_can_select(bw));

	ro_gui_menu_set_entry_shaded(menu, BROWSER_SELECTION_SAVE,
			~editor_flags & BW_EDITOR_CAN_COPY);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_SELECTION_COPY,
			~editor_flags & BW_EDITOR_CAN_COPY);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_SELECTION_CUT,
			~editor_flags & BW_EDITOR_CAN_CUT);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_SELECTION_PASTE,
			~editor_flags & BW_EDITOR_CAN_PASTE);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_SELECTION_CLEAR,
			~editor_flags & BW_EDITOR_CAN_COPY);


	/* Navigate Submenu */

	ro_gui_menu_set_entry_shaded(menu, BROWSER_NAVIGATE_BACK,
			!browser_window_back_available(bw));

	ro_gui_menu_set_entry_shaded(menu, BROWSER_NAVIGATE_FORWARD,
			!browser_window_forward_available(bw));

	ro_gui_menu_set_entry_shaded(menu, BROWSER_NAVIGATE_RELOAD_ALL,
			!browser_window_reload_available(bw));

	ro_gui_menu_set_entry_shaded(menu, BROWSER_NAVIGATE_STOP,
			!browser_window_stop_available(bw));

	ro_gui_menu_set_entry_shaded(menu, BROWSER_NAVIGATE_UP,
			!browser_window_up_available(bw));



	/* View Submenu */

	ro_gui_menu_set_entry_ticked(menu, BROWSER_IMAGES_FOREGROUND,
			g != NULL && nsoption_bool(foreground_images));

	ro_gui_menu_set_entry_ticked(menu, BROWSER_IMAGES_BACKGROUND,
			g != NULL && nsoption_bool(background_images));

	ro_gui_menu_set_entry_shaded(menu, BROWSER_BUFFER_ANIMS,
			g == NULL || g->option.buffer_everything);
	ro_gui_menu_set_entry_ticked(menu, BROWSER_BUFFER_ANIMS,
			g != NULL &&
			(g->option.buffer_animations ||
			g->option.buffer_everything));

	ro_gui_menu_set_entry_shaded(menu, BROWSER_BUFFER_ALL, g == NULL);
	ro_gui_menu_set_entry_ticked(menu, BROWSER_BUFFER_ALL,
			g != NULL && g->option.buffer_everything);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_SCALE_VIEW, !have_content);

	ro_gui_menu_set_entry_shaded(menu, BROWSER_WINDOW_STAGGER,
			nsoption_int(window_screen_width) == 0);
	ro_gui_menu_set_entry_ticked(menu, BROWSER_WINDOW_STAGGER,
			((nsoption_int(window_screen_width) == 0) ||
			 nsoption_bool(window_stagger)));

	ro_gui_menu_set_entry_ticked(menu, BROWSER_WINDOW_COPY,
			nsoption_bool(window_size_clone));

	ro_gui_menu_set_entry_shaded(menu, BROWSER_WINDOW_RESET,
			nsoption_int(window_screen_width) == 0);


	/* Utilities Submenu */

	ro_gui_menu_set_entry_shaded(menu, HOTLIST_ADD_URL, !have_content);

	ro_gui_menu_set_entry_shaded(menu, HISTORY_SHOW_LOCAL,
			(bw == NULL ||
			!(have_content || browser_window_back_available(bw) ||
			browser_window_forward_available(bw))));


	/* Help Submenu */

	ro_gui_menu_set_entry_ticked(menu, HELP_LAUNCH_INTERACTIVE,
			ro_gui_interactive_help_available() &&
				     nsoption_bool(interactive_help));

	return true;
}


/**
 * Process selections from a form select menu, passing them back to the core.
 *
 * \param g The browser window affected by the menu.
 * \param selection The menu selection.
 */
static void
ro_gui_window_process_form_select_menu(struct gui_window *g,
				       wimp_selection *selection)
{
	assert(g != NULL);

	if (selection->items[0] >= 0) {
		form_select_process_selection(gui_form_select_control,
					      selection->items[0]);
	}
}


/**
 * Prepare the object info window for use
 *
 * \param object the object for which information is to be displayed
 * \param target_url corresponding url, if any
 */
static void
ro_gui_window_prepare_objectinfo(struct hlcache_handle *object,
				 nsurl *target_url)
{
	char icon_buf[20] = "file_xxx";
	const char *url;
	lwc_string *mime;
	const char *target = "-";

	sprintf(icon_buf, "file_%.3x",ro_content_filetype(object));
	if (!ro_gui_wimp_sprite_exists(icon_buf)) {
		sprintf(icon_buf, "file_xxx");
	}

	url = nsurl_access(hlcache_handle_get_url(object));
	if (url == NULL) {
		url = "-";
	}
	mime = content_get_mime_type(object);

	if (target_url != NULL) {
		target = nsurl_access(target_url);
	}

	ro_gui_set_icon_string(dialog_objinfo, ICON_OBJINFO_ICON,
			icon_buf, true);
	ro_gui_set_icon_string(dialog_objinfo, ICON_OBJINFO_URL,
			url, true);
	ro_gui_set_icon_string(dialog_objinfo, ICON_OBJINFO_TARGET,
			target, true);
	ro_gui_set_icon_string(dialog_objinfo, ICON_OBJINFO_TYPE,
			lwc_string_data(mime), true);

	lwc_string_unref(mime);
}


/**
 * callback to handle window paste operation
 *
 * \param pw context containing browser window
 */
static void ro_gui_window_paste_cb(void *pw)
{
	struct browser_window *bw = pw;

	browser_window_key_press(bw, NS_KEY_PASTE);
}


/**
 * Handle selections from a browser window menu
 *
 * \param w The window owning the menu.
 * \param i The icon owning the menu.
 * \param menu The menu from which the selection was made.
 * \param selection The wimp menu selection data.
 * \param action The selected menu action.
 * \return true if action accepted; else false.
 */
static bool
ro_gui_window_menu_select(wimp_w w,
			  wimp_i i,
			  wimp_menu *menu,
			  wimp_selection *selection,
			  menu_action action)
{
	struct gui_window *g;
	struct browser_window *bw;
	struct hlcache_handle *h;
	struct toolbar *toolbar;
	wimp_window_state state;
	nsurl *url;
	nserror error = NSERROR_OK;

	g = (struct gui_window *) ro_gui_wimp_event_get_user_data(w);
	toolbar = g->toolbar;
	bw = g->bw;
	h = browser_window_get_content(bw);

	/* If this is a form menu from the core, handle it now and then exit.
	 * Otherwise, carry on to the main browser window menu.
	 */
	if (menu == gui_form_select_menu && w == g->window) {
		ro_gui_window_process_form_select_menu(g, selection);

		return true;
	}

	/* We're now safe to assume that this is either the browser or
	 * toolbar window menu.
	 */

	switch (action) {

		/* help actions */
	case HELP_OPEN_CONTENTS:
		error = nsurl_create("http://www.netsurf-browser.org/documentation/", &url);
		if (error == NSERROR_OK) {
			error = browser_window_create(BW_CREATE_HISTORY,
						      url,
						      NULL,
						      NULL,
						      NULL);
			nsurl_unref(url);
		}
		break;

	case HELP_OPEN_GUIDE:
		error = nsurl_create("http://www.netsurf-browser.org/documentation/guide", &url);
		if (error == NSERROR_OK) {
			error = browser_window_create(BW_CREATE_HISTORY,
						      url,
						      NULL,
						      NULL,
						      NULL);
			nsurl_unref(url);
		}
		break;

	case HELP_OPEN_INFORMATION:
		error = nsurl_create("http://www.netsurf-browser.org/documentation/info", &url);
		if (error == NSERROR_OK) {
			error = browser_window_create(BW_CREATE_HISTORY,
						      url,
						      NULL,
						      NULL,
						      NULL);
			nsurl_unref(url);
		}
		break;

	case HELP_OPEN_CREDITS:
		error = nsurl_create("about:credits", &url);
		if (error == NSERROR_OK) {
			error = browser_window_create(BW_CREATE_HISTORY,
						      url,
						      NULL,
						      NULL,
						      NULL);
			nsurl_unref(url);
		}
		break;

	case HELP_OPEN_LICENCE:
		error = nsurl_create("about:licence", &url);
		if (error == NSERROR_OK) {
			error = browser_window_create(BW_CREATE_HISTORY,
						      url,
						      NULL,
						      NULL,
						      NULL);
			nsurl_unref(url);
		}
		break;

	case HELP_LAUNCH_INTERACTIVE:
		if (!ro_gui_interactive_help_available()) {
			ro_gui_interactive_help_start();
			nsoption_set_bool(interactive_help, true);
		} else {
			nsoption_set_bool(interactive_help,
					  !nsoption_bool(interactive_help));
		}
		break;

		/* history actions */
	case HISTORY_SHOW_LOCAL:
		ro_gui_window_action_local_history(g);
		break;
	case HISTORY_SHOW_GLOBAL:
		ro_gui_global_history_present();
		break;

		/* hotlist actions */
	case HOTLIST_ADD_URL:
		ro_gui_window_action_add_bookmark(g);
		break;
	case HOTLIST_SHOW:
		ro_gui_hotlist_present();
		break;

		/* cookies actions */
	case COOKIES_SHOW:
		ro_gui_cookies_present(NULL);
		break;

	case COOKIES_DELETE:
		cookie_manager_keypress(NS_KEY_SELECT_ALL);
		cookie_manager_keypress(NS_KEY_DELETE_LEFT);
		break;

		/* page actions */
	case BROWSER_PAGE_INFO:
		ro_gui_window_action_page_info(g);
		break;
	case BROWSER_PRINT:
		ro_gui_window_action_print(g);
		break;
	case BROWSER_NEW_WINDOW:
		ro_gui_window_action_new_window(g);
		break;
	case BROWSER_VIEW_SOURCE:
		if (current_menu_main != NULL) {
			ro_gui_view_source(current_menu_main);
		} else if (h != NULL) {
			ro_gui_view_source(h);
		}
		break;

		/* object actions */
	case BROWSER_OBJECT_INFO:
		if (current_menu_object != NULL) {
			ro_gui_window_prepare_objectinfo(current_menu_object,
							 current_menu_url);
			ro_gui_dialog_open_persistent(g->window,
						      dialog_objinfo,
						      false);
		}
		break;
	case BROWSER_OBJECT_RELOAD:
		if (current_menu_object != NULL) {
			content_invalidate_reuse_data(current_menu_object);
			browser_window_reload(bw, false);
		}
		break;

		/* link actions */
	case BROWSER_LINK_SAVE_URI:
		if (current_menu_url != NULL) {
			ro_gui_save_prepare(GUI_SAVE_LINK_URI,
					    NULL,
					    NULL,
					    current_menu_url,
					    NULL);
			ro_gui_dialog_open_persistent(g->window,
						      dialog_saveas,
						      false);
		}
		break;
	case BROWSER_LINK_SAVE_URL:
		if (current_menu_url != NULL) {
			ro_gui_save_prepare(GUI_SAVE_LINK_URL,
					    NULL,
					    NULL,
					    current_menu_url,
					    NULL);
			ro_gui_dialog_open_persistent(g->window,
						      dialog_saveas,
						      false);
		}
		break;
	case BROWSER_LINK_SAVE_TEXT:
		if (current_menu_url != NULL) {
			ro_gui_save_prepare(GUI_SAVE_LINK_TEXT,
					    NULL,
					    NULL,
					    current_menu_url,
					    NULL);
			ro_gui_dialog_open_persistent(g->window,
						      dialog_saveas,
						      false);
		}
		break;

	case BROWSER_LINK_DOWNLOAD:
		if (current_menu_url != NULL) {
			error = browser_window_navigate(
				bw,
				current_menu_url,
				browser_window_access_url(bw),
				BW_NAVIGATE_DOWNLOAD,
				NULL,
				NULL,
				NULL);
		}
		break;

	case BROWSER_LINK_NEW_WINDOW:
		if (current_menu_url != NULL) {
			error = browser_window_create(
				BW_CREATE_HISTORY | BW_CREATE_CLONE,
				current_menu_url,
				browser_window_access_url(bw),
				bw,
				NULL);
		}
		break;


		/* save actions */
	case BROWSER_OBJECT_SAVE:
		if (current_menu_object != NULL) {
			ro_gui_save_prepare(GUI_SAVE_OBJECT_ORIG,
					    current_menu_object,
					    NULL,
					    NULL,
					    NULL);
			ro_gui_dialog_open_persistent(g->window,
						      dialog_saveas,
						      false);
		}
		break;
	case BROWSER_OBJECT_EXPORT_SPRITE:
		if (current_menu_object != NULL) {
			ro_gui_save_prepare(GUI_SAVE_OBJECT_NATIVE,
					    current_menu_object,
					    NULL,
					    NULL,
					    NULL);
			ro_gui_dialog_open_persistent(g->window,
						      dialog_saveas,
						      false);
		}
		break;
	case BROWSER_OBJECT_EXPORT_DRAW:
		if (current_menu_object != NULL) {
			ro_gui_save_prepare(GUI_SAVE_OBJECT_NATIVE,
					    current_menu_object,
					    NULL,
					    NULL,
					    NULL);
			ro_gui_dialog_open_persistent(g->window,
						      dialog_saveas,
						      false);
		}
		break;
	case BROWSER_SAVE:
		ro_gui_window_action_save(g, GUI_SAVE_SOURCE);
		break;
	case BROWSER_SAVE_COMPLETE:
		ro_gui_window_action_save(g, GUI_SAVE_COMPLETE);
		break;
	case BROWSER_EXPORT_DRAW:
		ro_gui_window_action_save(g, GUI_SAVE_DRAW);
		break;
	case BROWSER_EXPORT_PDF:
		ro_gui_window_action_save(g, GUI_SAVE_PDF);
		break;
	case BROWSER_EXPORT_TEXT:
		ro_gui_window_action_save(g, GUI_SAVE_TEXT);
		break;
	case BROWSER_SAVE_URL_URI:
		ro_gui_window_action_save(g, GUI_SAVE_LINK_URI);
		break;
	case BROWSER_SAVE_URL_URL:
		ro_gui_window_action_save(g, GUI_SAVE_LINK_URL);
		break;
	case BROWSER_SAVE_URL_TEXT:
		ro_gui_window_action_save(g, GUI_SAVE_LINK_TEXT);
		break;

		/* selection actions */
	case BROWSER_SELECTION_SAVE:
		if (h != NULL) {
			ro_gui_save_prepare(GUI_SAVE_TEXT_SELECTION,
					    NULL,
					    browser_window_get_selection(bw),
					    NULL,
					    NULL);
			ro_gui_dialog_open_persistent(g->window,
						      dialog_saveas,
						      false);
		}
		break;
	case BROWSER_SELECTION_COPY:
		browser_window_key_press(bw, NS_KEY_COPY_SELECTION);
		break;
	case BROWSER_SELECTION_CUT:
		browser_window_key_press(bw, NS_KEY_CUT_SELECTION);
		break;
	case BROWSER_SELECTION_PASTE:
		ro_gui_selection_prepare_paste(w, ro_gui_window_paste_cb, bw);
		break;
	case BROWSER_SELECTION_ALL:
		browser_window_key_press(bw, NS_KEY_SELECT_ALL);
		break;
	case BROWSER_SELECTION_CLEAR:
		browser_window_key_press(bw, NS_KEY_CLEAR_SELECTION);
		break;

		/* navigation actions */
	case BROWSER_NAVIGATE_HOME:
		ro_gui_window_action_home(g);
		break;
	case BROWSER_NAVIGATE_BACK:
		if (bw != NULL)
			browser_window_history_back(bw, false);
		break;
	case BROWSER_NAVIGATE_FORWARD:
		if (bw != NULL)
			browser_window_history_forward(bw, false);
		break;
	case BROWSER_NAVIGATE_UP:
		if (bw != NULL && h != NULL)
			browser_window_navigate_up(g->bw, false);
		break;
	case BROWSER_NAVIGATE_RELOAD_ALL:
		if (bw != NULL)
			browser_window_reload(bw, true);
		break;
	case BROWSER_NAVIGATE_STOP:
		if (bw != NULL)
			browser_window_stop(bw);
		break;

		/* browser window/display actions */
	case BROWSER_SCALE_VIEW:
		ro_gui_window_action_zoom(g);
		break;
	case BROWSER_FIND_TEXT:
		ro_gui_window_action_search(g);
		break;
	case BROWSER_IMAGES_FOREGROUND:
		if (g != NULL)
			nsoption_set_bool(foreground_images,
					  !nsoption_bool(foreground_images));
		break;
	case BROWSER_IMAGES_BACKGROUND:
		if (g != NULL)
			nsoption_set_bool(background_images,
					  !nsoption_bool(background_images));
		break;
	case BROWSER_BUFFER_ANIMS:
		if (g != NULL)
			g->option.buffer_animations =
				!g->option.buffer_animations;
		break;
	case BROWSER_BUFFER_ALL:
		if (g != NULL)
			g->option.buffer_everything =
				!g->option.buffer_everything;
		break;
	case BROWSER_SAVE_VIEW:
		if (bw != NULL) {
			ro_gui_window_default_options(g);
			ro_gui_save_options();
		}
		break;
	case BROWSER_WINDOW_DEFAULT:
		if (g != NULL) {
			os_error *oserror;

			ro_gui_screen_size(&nsoption_int(window_screen_width),
					   &nsoption_int(window_screen_height));
			state.w = w;
			oserror = xwimp_get_window_state(&state);
			if (oserror) {
				NSLOG(netsurf, INFO,
				      "xwimp_get_window_state: 0x%x: %s",
				      oserror->errnum,
				      oserror->errmess);
				ro_warn_user("WimpError", oserror->errmess);
			}
			nsoption_set_int(window_x, state.visible.x0);
			nsoption_set_int(window_y, state.visible.y0);
			nsoption_set_int(window_width,
					 state.visible.x1 - state.visible.x0);
			nsoption_set_int(window_height,
					 state.visible.y1 - state.visible.y0);
			ro_gui_save_options();
		}
		break;
	case BROWSER_WINDOW_STAGGER:
		nsoption_set_bool(window_stagger,
				  !nsoption_bool(window_stagger));
		ro_gui_save_options();
		break;
	case BROWSER_WINDOW_COPY:
		nsoption_set_bool(window_size_clone,
				  !nsoption_bool(window_size_clone));
		ro_gui_save_options();
		break;
	case BROWSER_WINDOW_RESET:
		nsoption_set_int(window_screen_width, 0);
		nsoption_set_int(window_screen_height, 0);
		ro_gui_save_options();
		break;

		/* toolbar actions */
	case TOOLBAR_BUTTONS:
		assert(toolbar);
		ro_toolbar_set_display_buttons(toolbar,
					       !ro_toolbar_get_display_buttons(toolbar));
		break;
	case TOOLBAR_ADDRESS_BAR:
		assert(toolbar);
		ro_toolbar_set_display_url(toolbar,
					   !ro_toolbar_get_display_url(toolbar));
		if (ro_toolbar_get_display_url(toolbar))
			ro_toolbar_take_caret(toolbar);
		break;
	case TOOLBAR_THROBBER:
		assert(toolbar);
		ro_toolbar_set_display_throbber(toolbar,
						!ro_toolbar_get_display_throbber(toolbar));
		break;
	case TOOLBAR_EDIT:
		assert(toolbar);
		ro_toolbar_toggle_edit(toolbar);
		break;

	default:
		return false;
	}

	if (error != NSERROR_OK) {
		ro_warn_user(messages_get_errorcode(error), 0);
	}

	return true;
}


/**
 * Handle submenu warnings for a browser window menu
 *
 * \param w The window owning the menu.
 * \param i The icon owning the menu.
 * \param menu The menu to which the warning applies.
 * \param selection The wimp menu selection data.
 * \param action The selected menu action.
 */
static void
ro_gui_window_menu_warning(wimp_w w,
			   wimp_i i,
			   wimp_menu *menu,
			   wimp_selection *selection,
			   menu_action action)
{
	struct gui_window *g;
	struct hlcache_handle *h;
	bool export;

	if (menu != ro_gui_browser_window_menu) {
		return;
	}

	g = (struct gui_window *) ro_gui_wimp_event_get_user_data(w);
	h = browser_window_get_content(g->bw);

	switch (action) {
	case BROWSER_PAGE_INFO:
		if (h != NULL) {
			ro_gui_window_prepare_pageinfo(g);
		}
		break;

	case BROWSER_FIND_TEXT:
		if (h != NULL &&
		    (content_get_type(h) == CONTENT_HTML ||
		     content_get_type(h) == CONTENT_TEXTPLAIN)) {
			ro_gui_search_prepare(g->bw);
		}
		break;

	case BROWSER_SCALE_VIEW:
		if (h != NULL) {
			ro_gui_dialog_prepare_zoom(g);
		}
		break;

	case BROWSER_PRINT:
		if (h != NULL) {
			ro_gui_print_prepare(g);
		}
		break;

	case BROWSER_OBJECT_INFO:
		if (current_menu_object != NULL) {
			ro_gui_window_prepare_objectinfo(current_menu_object,
							 current_menu_url);
		}
		break;

	case BROWSER_OBJECT_SAVE:
		if (current_menu_object != NULL) {
			ro_gui_save_prepare(GUI_SAVE_OBJECT_ORIG,
					    current_menu_object,
					    NULL,
					    NULL,
					    NULL);
		}
		break;

	case BROWSER_SELECTION_SAVE:
		if (browser_window_get_editor_flags(g->bw) & BW_EDITOR_CAN_COPY)
			ro_gui_save_prepare(GUI_SAVE_TEXT_SELECTION, NULL,
					browser_window_get_selection(g->bw),
					NULL, NULL);
		break;

	case BROWSER_SAVE_URL_URI:
		if (h != NULL)
			ro_gui_save_prepare(GUI_SAVE_LINK_URI, NULL, NULL,
					hlcache_handle_get_url(h),
					content_get_title(h));
		break;

	case BROWSER_SAVE_URL_URL:
		if (h != NULL)
			ro_gui_save_prepare(GUI_SAVE_LINK_URL, NULL, NULL,
					hlcache_handle_get_url(h),
					content_get_title(h));
		break;

	case BROWSER_SAVE_URL_TEXT:
		if (h != NULL)
			ro_gui_save_prepare(GUI_SAVE_LINK_TEXT, NULL, NULL,
					hlcache_handle_get_url(h),
					content_get_title(h));
		break;

	case BROWSER_OBJECT_SAVE_URL_URI:
		if (current_menu_object != NULL)
			ro_gui_save_prepare(GUI_SAVE_LINK_URI, NULL, NULL,
					hlcache_handle_get_url(
							current_menu_object),
					content_get_title(current_menu_object));
		break;

	case BROWSER_OBJECT_SAVE_URL_URL:
		if (current_menu_object != NULL)
			ro_gui_save_prepare(GUI_SAVE_LINK_URL, NULL, NULL,
					hlcache_handle_get_url(
							current_menu_object),
					content_get_title(current_menu_object));
		break;

	case BROWSER_OBJECT_SAVE_URL_TEXT:
		if (current_menu_object != NULL)
			ro_gui_save_prepare(GUI_SAVE_LINK_TEXT, NULL, NULL,
					hlcache_handle_get_url(
							current_menu_object),
					content_get_title(current_menu_object));
		break;

	case BROWSER_SAVE:
		if (h != NULL)
			ro_gui_save_prepare(GUI_SAVE_SOURCE, h, NULL, NULL, NULL);
		break;

	case BROWSER_SAVE_COMPLETE:
		if (h != NULL)
			ro_gui_save_prepare(GUI_SAVE_COMPLETE, h, NULL, NULL, NULL);
		break;

	case BROWSER_EXPORT_DRAW:
		if (h != NULL)
			ro_gui_save_prepare(GUI_SAVE_DRAW, h, NULL, NULL, NULL);
		break;

	case BROWSER_EXPORT_PDF:
		if (h != NULL)
			ro_gui_save_prepare(GUI_SAVE_PDF, h, NULL, NULL, NULL);
		break;

	case BROWSER_EXPORT_TEXT:
		if (h != NULL)
			ro_gui_save_prepare(GUI_SAVE_TEXT, h, NULL, NULL, NULL);
		break;

	case BROWSER_LINK_SAVE_URI:
		if (current_menu_url != NULL)
			ro_gui_save_prepare(GUI_SAVE_LINK_URI, NULL, NULL,
					current_menu_url, NULL);
		break;

	case BROWSER_LINK_SAVE_URL:
		if (current_menu_url != NULL)
			ro_gui_save_prepare(GUI_SAVE_LINK_URL, NULL, NULL,
					current_menu_url, NULL);
		break;

	case BROWSER_LINK_SAVE_TEXT:
		if (current_menu_url != NULL)
			ro_gui_save_prepare(GUI_SAVE_LINK_TEXT, NULL, NULL,
					current_menu_url, NULL);
		break;

	case BROWSER_OBJECT_EXPORT_SPRITE:
		if (current_menu_object != NULL) {
			ro_gui_window_content_export_types(current_menu_object,
					NULL, &export);

			if (export)
				ro_gui_save_prepare(GUI_SAVE_OBJECT_NATIVE,
						current_menu_object,
						NULL, NULL, NULL);
		} else if (h != NULL) {
			ro_gui_window_content_export_types(h, NULL, &export);

			if (export)
				ro_gui_save_prepare(GUI_SAVE_OBJECT_NATIVE,
						h, NULL, NULL, NULL);
		}
		break;

	case BROWSER_OBJECT_EXPORT_DRAW:
		if (current_menu_object != NULL) {
			ro_gui_window_content_export_types(current_menu_object,
					&export, NULL);

			if (export)
				ro_gui_save_prepare(GUI_SAVE_OBJECT_NATIVE,
						current_menu_object,
						NULL, NULL, NULL);
		} else if (h != NULL) {
			ro_gui_window_content_export_types(h, &export, NULL);

			if (export)
				ro_gui_save_prepare(GUI_SAVE_OBJECT_NATIVE,
						h, NULL, NULL, NULL);
		}
		break;

	default:
		break;
	}
}


/**
 * Handle the closure of a browser window menu
 *
 * \param w The window owning the menu.
 * \param i The icon owning the menu.
 * \param menu The menu that is being closed.
 */
static void ro_gui_window_menu_close(wimp_w w, wimp_i i, wimp_menu *menu)
{
	if (menu == ro_gui_browser_window_menu) {
		current_menu_object = NULL;
		current_menu_url = NULL;
	} else if (menu == gui_form_select_menu) {
		gui_form_select_control = NULL;
	}
}


/**
 * Clones a browser window's options.
 *
 * \param new_gui the new gui window
 * \param old_gui the gui window to clone from, or NULL for default
 */
static void
ro_gui_window_clone_options(struct gui_window *new_gui,
			    struct gui_window *old_gui)
{
	assert(new_gui);

	/*	Clone the basic options
	*/
	if (!old_gui) {
		new_gui->option.buffer_animations = nsoption_bool(buffer_animations);
		new_gui->option.buffer_everything = nsoption_bool(buffer_everything);
	} else {
		new_gui->option = old_gui->option;
	}

	/*	Set up the toolbar
	*/
	if (new_gui->toolbar) {
		ro_toolbar_set_display_buttons(new_gui->toolbar,
					       nsoption_bool(toolbar_show_buttons));
		ro_toolbar_set_display_url(new_gui->toolbar,
					   nsoption_bool(toolbar_show_address));
		ro_toolbar_set_display_throbber(new_gui->toolbar,
						nsoption_bool(toolbar_show_throbber));
		if ((old_gui) && (old_gui->toolbar)) {
			ro_toolbar_set_display_buttons(new_gui->toolbar,
					ro_toolbar_get_display_buttons(
						old_gui->toolbar));
			ro_toolbar_set_display_url(new_gui->toolbar,
					ro_toolbar_get_display_url(
						old_gui->toolbar));
			ro_toolbar_set_display_throbber(new_gui->toolbar,
					ro_toolbar_get_display_throbber(
						old_gui->toolbar));
			ro_toolbar_process(new_gui->toolbar, -1, true);
		}
	}
}


/**
 * Create and open a new browser window.
 *
 * \param bw		bw to create gui_window for
 * \param existing	an existing gui_window, may be NULL
 * \param flags		flags for gui window creation
 * \return gui window, or NULL on error
 */
static struct gui_window *gui_window_create(struct browser_window *bw,
		struct gui_window *existing,
		gui_window_create_flags flags)
{
	int screen_width, screen_height;
	static int window_count = 2;
	wimp_window window;
	wimp_window_state state;
	os_error *error;
	bool open_centred = true;
	struct gui_window *g;

	g = malloc(sizeof *g);
	if (!g) {
		ro_warn_user("NoMemory", 0);
		return 0;
	}
	g->bw = bw;
	g->toolbar = 0;
	g->status_bar = 0;
	g->old_width = 0;
	g->old_height = 0;
	g->update_extent = true;
	g->active = false;
	strcpy(g->title, "NetSurf");
	g->iconise_icon = -1;

	/* Set the window position */
	if (existing != NULL &&
			flags & GW_CREATE_CLONE &&
			nsoption_bool(window_size_clone)) {
		state.w = existing->window;
		error = xwimp_get_window_state(&state);
		if (error) {
			NSLOG(netsurf, INFO,
			      "xwimp_get_window_state: 0x%x: %s",
			      error->errnum,
			      error->errmess);
			ro_warn_user("WimpError", error->errmess);
		}
		window.visible.x0 = state.visible.x0;
		window.visible.x1 = state.visible.x1;
		window.visible.y0 = state.visible.y0 - 48;
		window.visible.y1 = state.visible.y1 - 48;
		open_centred = false;
	} else {
		int win_width, win_height;
		ro_gui_screen_size(&screen_width, &screen_height);

		/* Check if we have a preferred position */
		if ((nsoption_int(window_screen_width) != 0) &&
		    (nsoption_int(window_screen_height) != 0)) {
			win_width = (nsoption_int(window_width) *
					screen_width) /
					nsoption_int(window_screen_width);
			win_height = (nsoption_int(window_height) *
					screen_height) /
					nsoption_int(window_screen_height);
			window.visible.x0 = (nsoption_int(window_x) *
					screen_width) /
					nsoption_int(window_screen_width);
			window.visible.y0 = (nsoption_int(window_y) *
					screen_height) /
					nsoption_int(window_screen_height);
			if (nsoption_bool(window_stagger)) {
				window.visible.y0 += 96 -
						(48 * (window_count % 5));
			}
			open_centred = false;
			if (win_width < 100)
				win_width = 100;
			if (win_height < 100)
				win_height = 100;
		} else {

		       /* Base how we define the window height/width
			  on the compile time options set */
			win_width = screen_width * 3 / 4;
			if (1600 < win_width)
				win_width = 1600;
			win_height = win_width * 3 / 4;

			window.visible.x0 = (screen_width - win_width) / 2;
			window.visible.y0 = ((screen_height - win_height) / 2) +
					96 - (48 * (window_count % 5));
		}
		window.visible.x1 = window.visible.x0 + win_width;
		window.visible.y1 = window.visible.y0 + win_height;
	}

	/* General flags for a non-movable, non-resizable, no-title bar window */
	window.xscroll = 0;
	window.yscroll = 0;
	window.next = wimp_TOP;
	window.flags =	wimp_WINDOW_MOVEABLE |
			wimp_WINDOW_NEW_FORMAT |
			wimp_WINDOW_VSCROLL |
			wimp_WINDOW_HSCROLL |
			wimp_WINDOW_IGNORE_XEXTENT |
			wimp_WINDOW_IGNORE_YEXTENT |
			wimp_WINDOW_SCROLL_REPEAT;
	window.title_fg = wimp_COLOUR_BLACK;
	window.title_bg = wimp_COLOUR_LIGHT_GREY;
	window.work_fg = wimp_COLOUR_LIGHT_GREY;
	window.work_bg = wimp_COLOUR_TRANSPARENT;
	window.scroll_outer = wimp_COLOUR_DARK_GREY;
	window.scroll_inner = wimp_COLOUR_MID_LIGHT_GREY;
	window.highlight_bg = wimp_COLOUR_CREAM;
	window.extra_flags = wimp_WINDOW_USE_EXTENDED_SCROLL_REQUEST |
			wimp_WINDOW_GIVE_SHADED_ICON_INFO;
	window.extent.x0 = 0;
	window.extent.y0 = -(window.visible.y1 - window.visible.y0);
	window.extent.x1 = window.visible.x1 - window.visible.x0;
	window.extent.y1 = 0;
	window.title_flags = wimp_ICON_TEXT |
			wimp_ICON_INDIRECTED |
			wimp_ICON_HCENTRED;
	window.work_flags = wimp_BUTTON_DOUBLE_CLICK_DRAG <<
			wimp_ICON_BUTTON_TYPE_SHIFT;
	window.sprite_area = wimpspriteop_AREA;
	window.xmin = 1;
	window.ymin = 1;
	window.title_data.indirected_text.text = g->title;
	window.title_data.indirected_text.validation = (char *) -1;
	window.title_data.indirected_text.size = 255;
	window.icon_count = 0;

	/* Add in flags */
	window.flags |=	wimp_WINDOW_SIZE_ICON |
			wimp_WINDOW_BACK_ICON |
			wimp_WINDOW_CLOSE_ICON |
			wimp_WINDOW_TITLE_ICON |
			wimp_WINDOW_TOGGLE_ICON;

	if (open_centred) {
		int scroll_width = ro_get_vscroll_width(NULL);
		window.visible.x0 -= scroll_width;
	}

	error = xwimp_create_window(&window, &g->window);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_create_window: 0x%x: %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		free(g);
		return 0;
	}

	/* Link into window list */
	g->prev = 0;
	g->next = window_list;
	if (window_list)
		window_list->prev = g;
	window_list = g;
	window_count++;

	/* Add in a toolbar and status bar */
	g->status_bar = ro_gui_status_bar_create(g->window,
						 nsoption_int(toolbar_status_size));
	g->toolbar = ro_toolbar_create(NULL, g->window,
			THEME_STYLE_BROWSER_TOOLBAR, TOOLBAR_FLAGS_NONE,
			&ro_gui_window_toolbar_callbacks, g,
			"HelpToolbar");
	if (g->toolbar != NULL) {
		ro_toolbar_add_buttons(g->toolbar,
				brower_toolbar_buttons,
				       nsoption_charp(toolbar_browser));
		ro_toolbar_add_url(g->toolbar);
		ro_toolbar_add_throbber(g->toolbar);
		ro_toolbar_rebuild(g->toolbar);
	}

	/* Register event handlers.  Do this quickly, as some of the things
	 * that follow will indirectly look up our user data: this MUST
	 * be set first!
	 */
	ro_gui_wimp_event_set_user_data(g->window, g);
	ro_gui_wimp_event_register_open_window(g->window,
			ro_gui_window_open);
	ro_gui_wimp_event_register_close_window(g->window,
			ro_gui_window_close);
	ro_gui_wimp_event_register_redraw_window(g->window,
			ro_gui_window_redraw);
	ro_gui_wimp_event_register_scroll_window(g->window,
			ro_gui_window_scroll);
	ro_gui_wimp_event_register_pointer_entering_window(g->window,
			ro_gui_window_pointer_entering);
	ro_gui_wimp_event_register_keypress(g->window,
			ro_gui_window_keypress);
	ro_gui_wimp_event_register_mouse_click(g->window,
			ro_gui_window_click);
	ro_gui_wimp_event_register_menu(g->window,
			ro_gui_browser_window_menu,
			true, false);
	ro_gui_wimp_event_register_menu_prepare(g->window,
			ro_gui_window_menu_prepare);
	ro_gui_wimp_event_register_menu_selection(g->window,
			ro_gui_window_menu_select);
	ro_gui_wimp_event_register_menu_warning(g->window,
			ro_gui_window_menu_warning);
	ro_gui_wimp_event_register_menu_close(g->window,
			ro_gui_window_menu_close);

	/* Set the window options */
	ro_gui_window_clone_options(g, existing);
	ro_gui_window_update_toolbar_buttons(g);

	/* Open the window at the top of the stack */
	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_get_window_state: 0x%x: %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return g;
	}

	state.next = wimp_TOP;

	ro_gui_window_open(PTR_WIMP_OPEN(&state));

	/* Claim the caret */
	if (ro_toolbar_take_caret(g->toolbar)) {
		ro_gui_url_complete_start(g->toolbar);
	} else {
		gui_window_place_caret(g, -100, -100, 0, NULL);
	}

	return g;
}


/**
 * Remove all pending update boxes for a window
 *
 * \param g gui_window
 */
static void ro_gui_window_remove_update_boxes(struct gui_window *g)
{
	struct update_box *cur;

	for (cur = pending_updates; cur != NULL; cur = cur->next) {
		if (cur->g == g) {
			cur->g = NULL;
		}
	}
}


/**
 * Close a browser window and free any related resources.
 *
 * \param  g  gui_window to destroy
 */
static void gui_window_destroy(struct gui_window *g)
{
	os_error *error;
	wimp_w w;

	assert(g);

	/* stop any tracking */
	ro_mouse_kill(g);

	/* remove from list */
	if (g->prev)
		g->prev->next = g->next;
	else
		window_list = g->next;
	if (g->next)
		g->next->prev = g->prev;

	/* destroy toolbar */
	if (g->toolbar)
		ro_toolbar_destroy(g->toolbar);
	if (g->status_bar)
		ro_gui_status_bar_destroy(g->status_bar);

	w = g->window;
	ro_gui_url_complete_close();
	ro_gui_dialog_close_persistent(w);
	if (current_menu_window == w)
		ro_gui_menu_destroy();
	ro_gui_window_remove_update_boxes(g);

	/* delete window */
	error = xwimp_delete_window(w);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_delete_window: 0x%x: %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
	}
	ro_gui_wimp_event_finalise(w);

	free(g);
}


/**
 * Set the title of a browser window.
 *
 * \param  g	  gui_window to update
 * \param  title  new window title, copied
 */
static void gui_window_set_title(struct gui_window *g, const char *title)
{
	float scale;
	assert(g);
	assert(title);

	scale = browser_window_get_scale(g->bw);

	if (scale != 1.0) {
		int scale_disp = scale * 100;

		if (ABS((float)scale_disp - scale * 100) >= 0.05) {
			snprintf(g->title, sizeof g->title, "%s (%.1f%%)",
					title, scale * 100);
		} else {
			snprintf(g->title, sizeof g->title, "%s (%i%%)",
					title, scale_disp);
		}
	} else {
		strncpy(g->title, title, sizeof(g->title));
	}

	ro_gui_set_window_title(g->window, g->title);
}


/**
 * Get the scroll position of a browser window.
 *
 * \param  g   gui_window
 * \param  sx  receives x ordinate of point at top-left of window
 * \param  sy  receives y ordinate of point at top-left of window
 * \return true iff successful
 */
static bool gui_window_get_scroll(struct gui_window *g, int *sx, int *sy)
{
	wimp_window_state state;
	os_error *error;
	int toolbar_height = 0;

	assert(g);

	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_get_window_state: 0x%x: %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return false;
	}

	if (g->toolbar) {
		toolbar_height = ro_toolbar_full_height(g->toolbar);
	}
	*sx = state.xscroll / 2;
	*sy = -(state.yscroll - toolbar_height) / 2;
	return true;
}


/**
 * Set the scroll position of a riscos browser window.
 *
 * Scrolls the viewport to ensure the specified rectangle of the
 *   content is shown.
 *
 * \param g gui window to scroll
 * \param rect The rectangle to ensure is shown.
 * \return NSERROR_OK on success or apropriate error code.
 */
static nserror
gui_window_set_scroll(struct gui_window *g, const struct rect *rect)
{
	wimp_window_state state;
	os_error *error;
	int toolbar_height = 0;

	assert(g);

	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_get_window_state: 0x%x: %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return NSERROR_BAD_PARAMETER;
	}

	if (g->toolbar) {
		toolbar_height = ro_toolbar_full_height(g->toolbar);
	}

	if ((rect->x0 == rect->x1) && (rect->y0 == rect->y1)) {
		/* scroll to top */
		state.xscroll = rect->x0 * 2;
		state.yscroll = (-rect->y0 * 2) + toolbar_height;
	} else {
		/* scroll area into view with padding */
		int x0, y0, x1, y1;
		int cx0, cy0, width, height;
		int padding_available;
		int correction;

		x0 = rect->x0 * 2 ;
		y0 = rect->y0 * 2 ;
		x1 = rect->x1 * 2 ;
		y1 = rect->y1 * 2 ;

		cx0 = state.xscroll;
		cy0 = -state.yscroll + toolbar_height;
		width = state.visible.x1 - state.visible.x0;
		height = state.visible.y1 - state.visible.y0 - toolbar_height;

		/* make sure we're visible */
		correction = (x1 - cx0 - width);
		if (correction > 0) {
			cx0 += correction;
		}
		correction = (y1 - cy0 - height);
		if (correction > 0) {
			cy0 += correction;
		}
		if (x0 < cx0) {
			cx0 = x0;
		}
		if (y0 < cy0) {
			cy0 = y0;
		}

		/* try to give a SCROLL_VISIBLE_PADDING border of space around us */
		padding_available = (width - x1 + x0) / 2;
		if (padding_available > 0) {
			if (padding_available > SCROLL_VISIBLE_PADDING) {
				padding_available = SCROLL_VISIBLE_PADDING;
			}
			correction = (cx0 + width - x1);
			if (correction < padding_available) {
				cx0 += padding_available;
			}
			correction = (x0 - cx0);
			if (correction < padding_available) {
				cx0 -= padding_available;
			}
		}
		padding_available = (height - y1 + y0) / 2;
		if (padding_available > 0) {
			if (padding_available > SCROLL_VISIBLE_PADDING) {
				padding_available = SCROLL_VISIBLE_PADDING;
			}
			correction = (cy0 + height - y1);
			if (correction < padding_available) {
				cy0 += padding_available;
			}
			correction = (y0 - cy0);
			if (correction < padding_available) {
				cy0 -= padding_available;
			}
		}

		state.xscroll = cx0;
		state.yscroll = -cy0 + toolbar_height;
	}
	ro_gui_window_open(PTR_WIMP_OPEN(&state));

	return NSERROR_OK;
}


/**
 * Find the current dimensions of a browser window's content area.
 *
 * \param gw gui window to measure
 * \param width receives width of window
 * \param height receives height of window
 * \return NSERROR_OK and width and height updated
 */
static nserror
gui_window_get_dimensions(struct gui_window *gw, int *width, int *height)
{
	/* use the cached window sizes */
	*width = gw->old_width / 2;
	*height = gw->old_height / 2;

	return NSERROR_OK;
}


/**
 * Set the status bar of a browser window.
 *
 * \param  g	 gui_window to update
 * \param  text  new status text
 */
static void riscos_window_set_status(struct gui_window *g, const char *text)
{
	if (g->status_bar) {
		ro_gui_status_bar_set_text(g->status_bar, text);
	}
}


/**
 * Update the interface to reflect start of page loading.
 *
 * \param  g  window with start of load
 */
static void gui_window_start_throbber(struct gui_window *g)
{
	ro_gui_window_update_toolbar_buttons(g);
	ro_gui_menu_refresh(ro_gui_browser_window_menu);
	if (g->toolbar != NULL)
		ro_toolbar_start_throbbing(g->toolbar);
	g->active = true;
}


/**
 * Update the interface to reflect page loading stopped.
 *
 * \param  g  window with start of load
 */
static void gui_window_stop_throbber(struct gui_window *g)
{
	ro_gui_window_update_toolbar_buttons(g);
	ro_gui_menu_refresh(ro_gui_browser_window_menu);
	if (g->toolbar != NULL)
		ro_toolbar_stop_throbbing(g->toolbar);
	g->active = false;
}


/**
 * Update the interface to reflect change in page info status
 *
 * \param gw window with start of load
 */
static void gui_window_page_info_change(struct gui_window *gw)
{
	if (gw->toolbar != NULL) {
		ro_toolbar_page_info_change(gw->toolbar);
	}
}


/**
 * set favicon
 */
static void
gui_window_set_icon(struct gui_window *g, struct hlcache_handle *icon)
{
	if (g == NULL || g->toolbar == NULL)
		return;

	ro_toolbar_set_site_favicon(g->toolbar, icon);
}


/**
 * Remove the caret, if present.
 *
 * \param g window with caret
 */
static void gui_window_remove_caret(struct gui_window *g)
{
	wimp_caret caret;
	os_error *error;

	error = xwimp_get_caret_position(&caret);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_get_caret_position: 0x%x: %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return;
	}

	if (caret.w == g->window) {
		/* we have the caret: hide caret, but keep input focus */
		gui_window_place_caret(g, -100, -100, 0, NULL);
	}
}


/**
 * Called when the gui_window has new content.
 *
 * \param g the gui_window that has new content
 */
static void gui_window_new_content(struct gui_window *g)
{
	ro_gui_menu_refresh(ro_gui_browser_window_menu);
	ro_gui_window_update_toolbar_buttons(g);
	ro_gui_dialog_close_persistent(g->window);
	ro_toolbar_set_content_favicon(g->toolbar, g);
}


/**
 * Completes scrolling of a browser window
 *
 * \param drag The DragEnd event data block.
 * \param data gui window block pointer.
 */
static void ro_gui_window_scroll_end(wimp_dragged *drag, void *data)
{
	wimp_pointer pointer;
	os_error *error;
	os_coord pos;
	struct gui_window *g = (struct gui_window *) data;

	if (!g)
		return;

	error = xwimp_drag_box((wimp_drag*)-1);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_drag_box: 0x%x : %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
	}

	error = xwimp_get_pointer_info(&pointer);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_get_pointer_info 0x%x : %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return;
	}

	error = xwimpspriteop_set_pointer_shape("ptr_default", 0x31, 0, 0, 0, 0);
	if (error) {
		NSLOG(netsurf, INFO,
		      "xwimpspriteop_set_pointer_shape: 0x%x: %s",
		      error->errnum,
		      error->errmess);
		ro_warn_user("WimpError", error->errmess);
	}

	if (ro_gui_window_to_window_pos(g, drag->final.x0, drag->final.y0, &pos)) {
		browser_window_mouse_track(g->bw, 0, pos.x, pos.y);
	}
}


/**
 * Starts drag scrolling of a browser window
 *
 * \param g the window to scroll
 */
static bool gui_window_scroll_start(struct gui_window *g)
{
	wimp_window_info_base info;
	wimp_pointer pointer;
	os_error *error;
	wimp_drag drag;
	int height;
	int width;

	error = xwimp_get_pointer_info(&pointer);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_get_pointer_info 0x%x : %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return false;
	}

	info.w = g->window;
	error = xwimp_get_window_info_header_only((wimp_window_info*)&info);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_get_window_state: 0x%x : %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return false;
	}

	width  = info.extent.x1 - info.extent.x0;
	height = info.extent.y1 - info.extent.y0;

	drag.type = wimp_DRAG_USER_POINT;
	drag.bbox.x1 = pointer.pos.x + info.xscroll;
	drag.bbox.y0 = pointer.pos.y + info.yscroll;
	drag.bbox.x0 = drag.bbox.x1 - (width  - (info.visible.x1 - info.visible.x0));
	drag.bbox.y1 = drag.bbox.y0 + (height - (info.visible.y1 - info.visible.y0));

	if (g->toolbar) {
		int tbar_height = ro_toolbar_full_height(g->toolbar);
		drag.bbox.y0 -= tbar_height;
		drag.bbox.y1 -= tbar_height;
	}

	error = xwimp_drag_box(&drag);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_drag_box: 0x%x : %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return false;
	}

	ro_mouse_drag_start(ro_gui_window_scroll_end, ro_gui_window_mouse_at,
			NULL, g);
	return true;
}


/**
 * Platform-dependent part of starting drag operation.
 *
 * \param  g	gui window containing the drag
 * \param  type	type of drag the core is performing
 * \param  rect rectangle to constrain pointer to (relative to drag start coord)
 * \return true iff succesful
 */
static bool
gui_window_drag_start(struct gui_window *g,
		      gui_drag_type type,
		      const struct rect *rect)
{
	wimp_pointer pointer;
	wimp_drag drag;
	float scale = browser_window_get_scale(g->bw);

	if (rect != NULL) {
		/* We have a box to constrain the pointer to, for the drag
		 * duration */
		os_error *error = xwimp_get_pointer_info(&pointer);
		if (error) {
			NSLOG(netsurf, INFO,
			      "xwimp_get_pointer_info 0x%x : %s",
			      error->errnum,
			      error->errmess);
			ro_warn_user("WimpError", error->errmess);
			return false;
		}

		drag.type = wimp_DRAG_USER_POINT;
		drag.bbox.x0 = pointer.pos.x +
				(int)(rect->x0 * 2 * scale);
		drag.bbox.y0 = pointer.pos.y +
				(int)(rect->y0 * 2 * scale);
		drag.bbox.x1 = pointer.pos.x +
				(int)(rect->x1 * 2 * scale);
		drag.bbox.y1 = pointer.pos.y +
				(int)(rect->y1 * 2 * scale);

		error = xwimp_drag_box(&drag);
		if (error) {
			NSLOG(netsurf, INFO, "xwimp_drag_box: 0x%x : %s",
			      error->errnum, error->errmess);
			ro_warn_user("WimpError", error->errmess);
			return false;
		}
	}

	switch (type) {
	case GDRAGGING_SCROLLBAR:
		/* Dragging a core scrollbar */
		ro_mouse_drag_start(ro_gui_window_scroll_end,
				    ro_gui_window_mouse_at,
				    NULL, g);
		break;

	default:
		/* Not handled here yet */
		break;
	}

	return true;
}


/**
 * Save the specified content as a link.
 *
 * \param g  The window containing the content
 * \param url The url of the link
 * \param title The title of the link
 */
static nserror
gui_window_save_link(struct gui_window *g, nsurl *url, const char *title)
{
	ro_gui_save_prepare(GUI_SAVE_LINK_URL, NULL, NULL, url, title);
	ro_gui_dialog_open_persistent(g->window, dialog_saveas, true);
	return NSERROR_OK;
}


/**
 * Display a menu of options for a form select control.
 *
 * \param  g	    gui window containing form control
 * \param  control  form control of type GADGET_SELECT
 */
static void
gui_window_create_form_select_menu(struct gui_window *g,
				   struct form_control *control)
{
	os_error	*error;
	wimp_pointer	pointer;

	/* The first time the menu is opened, control bypasses the normal
	 * Menu Prepare event and so we prepare here.  On any re-opens,
	 * ro_gui_window_prepare_form_select_menu() is called from the
	 * normal wimp event.
	 */

	if (!ro_gui_window_prepare_form_select_menu(g, control))
		return;

	error = xwimp_get_pointer_info(&pointer);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_get_pointer_info: 0x%x: %s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		ro_gui_menu_destroy();
		return;
	}

	gui_form_select_control = control;
	ro_gui_menu_create(gui_form_select_menu,
			pointer.pos.x, pointer.pos.y, g->window);
}


/**
 * Import text file into window
 *
 * \param  g	     gui window containing textarea
 * \param  filename  pathname of file to be imported
 * \return true iff successful
 */
static bool
ro_gui_window_import_text(struct gui_window *g, const char *filename)
{
	fileswitch_object_type obj_type;
	os_error *error;
	char *buf, *utf8_buf, *sp;
	int size;
	nserror ret;
	const char *ep;
	char *p;

	error = xosfile_read_stamped(filename, &obj_type, NULL, NULL,
			&size, NULL, NULL);
	if (error) {
		NSLOG(netsurf, INFO, "xosfile_read_stamped: 0x%x:%s",
		      error->errnum, error->errmess);
		ro_warn_user("FileError", error->errmess);
		return true;  /* was for us, but it didn't work! */
	}

	/* Allocate one byte more than needed to ensure that the buffer is
	 * always terminated, regardless of file contents.
	 */

	buf = calloc(size + 1, sizeof(char));
	if (!buf) {
		ro_warn_user("NoMemory", NULL);
		return true;
	}

	error = xosfile_load_stamped(filename, (byte*)buf,
			NULL, NULL, NULL, NULL, NULL);

	if (error) {
		NSLOG(netsurf, INFO, "xosfile_load_stamped: 0x%x:%s",
		      error->errnum, error->errmess);
		ro_warn_user("LoadError", error->errmess);
		free(buf);
		return true;
	}

	ret = utf8_from_local_encoding(buf, size, &utf8_buf);
	if (ret != NSERROR_OK) {
		/* bad encoding shouldn't happen */
		assert(ret != NSERROR_BAD_ENCODING);
		NSLOG(netsurf, INFO, "utf8_from_local_encoding failed");
		free(buf);
		ro_warn_user("NoMemory", NULL);
		return true;
	}
	size = strlen(utf8_buf);

	ep = utf8_buf + size;
	p = utf8_buf;

	/* skip leading whitespace */
	while (isspace(*p)) p++;

	sp = p;
	while (*p && *p != '\r' && *p != '\n')
		p += utf8_next(p, ep - p, 0);
	*p = '\0';

	if (p > sp)
		ro_gui_window_launch_url(g, sp);

	free(buf);
	free(utf8_buf);
	return true;
}


/**
 * process miscellaneous window events
 *
 * \param gw The window receiving the event.
 * \param event The event code.
 * \return NSERROR_OK when processed ok
 */
static nserror
ro_gui_window_event(struct gui_window *gw, enum gui_window_event event)
{
	switch (event) {
	case GW_EVENT_UPDATE_EXTENT:
		gui_window_update_extent(gw);
		break;

	case GW_EVENT_REMOVE_CARET:
		gui_window_remove_caret(gw);
		break;

	case GW_EVENT_SCROLL_START:
		gui_window_scroll_start(gw);
		break;

	case GW_EVENT_NEW_CONTENT:
		gui_window_new_content(gw);
		break;

	case GW_EVENT_START_THROBBER:
		gui_window_start_throbber(gw);
		break;

	case GW_EVENT_STOP_THROBBER:
		gui_window_stop_throbber(gw);
		break;

	case GW_EVENT_START_SELECTION:
		/* from textselection */
		gui_start_selection(gw);
		break;

	case GW_EVENT_PAGE_INFO_CHANGE:
		gui_window_page_info_change(gw);
		break;

	default:
		break;
	}
	return NSERROR_OK;
}


/**
 * RISC OS browser window operation table
 */
static struct gui_window_table window_table = {
	.create = gui_window_create,
	.destroy = gui_window_destroy,
	.invalidate = ro_gui_window_invalidate_area,
	.get_scroll = gui_window_get_scroll,
	.set_scroll = gui_window_set_scroll,
	.get_dimensions = gui_window_get_dimensions,
	.event = ro_gui_window_event,

	.set_title = gui_window_set_title,
	.set_url = ro_gui_window_set_url,
	.set_icon = gui_window_set_icon,
	.set_status = riscos_window_set_status,
	.set_pointer = gui_window_set_pointer,
	.place_caret = gui_window_place_caret,
	.save_link = gui_window_save_link,
	.drag_start = gui_window_drag_start,
	.create_form_select_menu = gui_window_create_form_select_menu,

	/* from save */
	.drag_save_object = gui_drag_save_object,
	.drag_save_selection =gui_drag_save_selection,
};

struct gui_window_table *riscos_window_table = &window_table;


/* exported interface documented in riscos/window.h */
void ro_gui_window_initialise(void)
{
	/* Build the browser window menu. */

	static const struct ns_menu browser_definition = {
		"NetSurf", {
			{ "Page", BROWSER_PAGE, 0 },
			{ "Page.PageInfo",BROWSER_PAGE_INFO, &dialog_pageinfo },
			{ "Page.Save", BROWSER_SAVE, &dialog_saveas },
			{ "Page.SaveComp", BROWSER_SAVE_COMPLETE, &dialog_saveas },
			{ "Page.Export", NO_ACTION, 0 },
#ifdef WITH_DRAW_EXPORT
			{ "Page.Export.Draw", BROWSER_EXPORT_DRAW, &dialog_saveas },
#endif
#ifdef WITH_PDF_EXPORT
			{ "Page.Export.PDF", BROWSER_EXPORT_PDF, &dialog_saveas },
#endif
			{ "Page.Export.Text", BROWSER_EXPORT_TEXT, &dialog_saveas },
			{ "Page.SaveURL", NO_ACTION, 0 },
			{ "Page.SaveURL.URI", BROWSER_SAVE_URL_URI, &dialog_saveas },
			{ "Page.SaveURL.URL", BROWSER_SAVE_URL_URL, &dialog_saveas },
			{ "Page.SaveURL.LinkText", BROWSER_SAVE_URL_TEXT, &dialog_saveas },
			{ "_Page.Print", BROWSER_PRINT, &dialog_print },
			{ "Page.NewWindow", BROWSER_NEW_WINDOW, 0 },
			{ "Page.FindText", BROWSER_FIND_TEXT, &dialog_search },
			{ "Page.ViewSrc", BROWSER_VIEW_SOURCE, 0 },
			{ "Object", BROWSER_OBJECT, 0 },
			{ "Object.Object", BROWSER_OBJECT_OBJECT, 0 },
			{ "Object.Object.ObjInfo", BROWSER_OBJECT_INFO, &dialog_objinfo },
			{ "Object.Object.ObjSave", BROWSER_OBJECT_SAVE, &dialog_saveas },
			{ "Object.Object.Export", BROWSER_OBJECT_EXPORT, 0 },
			{ "Object.Object.Export.Sprite", BROWSER_OBJECT_EXPORT_SPRITE, &dialog_saveas },
#ifdef WITH_DRAW_EXPORT
			{ "Object.Object.Export.ObjDraw", BROWSER_OBJECT_EXPORT_DRAW, &dialog_saveas },
#endif
			{ "Object.Object.SaveURL", NO_ACTION, 0 },
			{ "Object.Object.SaveURL.URI", BROWSER_OBJECT_SAVE_URL_URI, &dialog_saveas },
			{ "Object.Object.SaveURL.URL", BROWSER_OBJECT_SAVE_URL_URL, &dialog_saveas },
			{ "Object.Object.SaveURL.LinkText", BROWSER_OBJECT_SAVE_URL_TEXT, &dialog_saveas },
			{ "Object.Object.ObjPrint", BROWSER_OBJECT_PRINT, 0 },
			{ "Object.Object.ObjReload", BROWSER_OBJECT_RELOAD, 0 },
			{ "Object.Link", BROWSER_OBJECT_LINK, 0 },
			{ "Object.Link.LinkSave", BROWSER_LINK_SAVE, 0 },
			{ "Object.Link.LinkSave.URI", BROWSER_LINK_SAVE_URI, &dialog_saveas },
			{ "Object.Link.LinkSave.URL", BROWSER_LINK_SAVE_URL, &dialog_saveas },
			{ "Object.Link.LinkSave.LinkText", BROWSER_LINK_SAVE_TEXT, &dialog_saveas },
			{ "_Object.Link.LinkDload", BROWSER_LINK_DOWNLOAD, 0 },
			{ "Object.Link.LinkNew", BROWSER_LINK_NEW_WINDOW, 0 },
			{ "Selection", BROWSER_SELECTION, 0 },
			{ "_Selection.SelSave", BROWSER_SELECTION_SAVE, &dialog_saveas },
			{ "Selection.Copy", BROWSER_SELECTION_COPY, 0 },
			{ "Selection.Cut", BROWSER_SELECTION_CUT, 0 },
			{ "_Selection.Paste", BROWSER_SELECTION_PASTE, 0 },
			{ "Selection.Clear", BROWSER_SELECTION_CLEAR, 0 },
			{ "Selection.SelectAll", BROWSER_SELECTION_ALL, 0 },
			{ "Navigate", NO_ACTION, 0 },
			{ "Navigate.Home", BROWSER_NAVIGATE_HOME, 0 },
			{ "Navigate.Back", BROWSER_NAVIGATE_BACK, 0 },
			{ "Navigate.Forward", BROWSER_NAVIGATE_FORWARD, 0 },
			{ "_Navigate.UpLevel", BROWSER_NAVIGATE_UP, 0 },
			{ "Navigate.Reload", BROWSER_NAVIGATE_RELOAD_ALL, 0 },
			{ "Navigate.Stop", BROWSER_NAVIGATE_STOP, 0 },
			{ "View", NO_ACTION, 0 },
			{ "View.ScaleView", BROWSER_SCALE_VIEW, &dialog_zoom },
			{ "View.Images", NO_ACTION, 0 },
			{ "View.Images.ForeImg", BROWSER_IMAGES_FOREGROUND, 0 },
			{ "View.Images.BackImg", BROWSER_IMAGES_BACKGROUND, 0 },
			{ "View.Toolbars", NO_ACTION, 0 },
			{ "View.Toolbars.ToolButtons", TOOLBAR_BUTTONS, 0 },
			{ "View.Toolbars.ToolAddress", TOOLBAR_ADDRESS_BAR, 0 },
			{ "_View.Toolbars.ToolThrob", TOOLBAR_THROBBER, 0 },
			{ "View.Toolbars.EditToolbar", TOOLBAR_EDIT, 0 },
			{ "_View.Render", NO_ACTION, 0 },
			{ "View.Render.RenderAnims", BROWSER_BUFFER_ANIMS, 0 },
			{ "View.Render.RenderAll", BROWSER_BUFFER_ALL, 0 },
			{ "_View.OptDefault", BROWSER_SAVE_VIEW, 0 },
			{ "View.Window", NO_ACTION, 0 },
			{ "View.Window.WindowSave", BROWSER_WINDOW_DEFAULT, 0 },
			{ "View.Window.WindowStagr", BROWSER_WINDOW_STAGGER, 0 },
			{ "_View.Window.WindowSize", BROWSER_WINDOW_COPY, 0 },
			{ "View.Window.WindowReset", BROWSER_WINDOW_RESET, 0 },
			{ "Utilities", NO_ACTION, 0 },
			{ "Utilities.Hotlist", HOTLIST_SHOW, 0 },
			{ "Utilities.Hotlist.HotlistAdd", HOTLIST_ADD_URL, 0 },
			{ "Utilities.Hotlist.HotlistShow", HOTLIST_SHOW, 0 },
			{ "Utilities.History", HISTORY_SHOW_GLOBAL, 0 },
			{ "Utilities.History.HistLocal", HISTORY_SHOW_LOCAL, 0 },
			{ "Utilities.History.HistGlobal", HISTORY_SHOW_GLOBAL, 0 },
			{ "Utilities.Cookies", COOKIES_SHOW, 0 },
			{ "Utilities.Cookies.ShowCookies", COOKIES_SHOW, 0 },
			{ "Utilities.Cookies.DeleteCookies", COOKIES_DELETE, 0 },
			{ "Help", HELP_OPEN_CONTENTS, 0 },
			{ "Help.HelpContent", HELP_OPEN_CONTENTS, 0 },
			{ "Help.HelpGuide", HELP_OPEN_GUIDE, 0 },
			{ "_Help.HelpInfo", HELP_OPEN_INFORMATION, 0 },
			{ "Help.HelpCredits", HELP_OPEN_CREDITS, 0 },
			{ "_Help.HelpLicence", HELP_OPEN_LICENCE, 0 },
			{ "Help.HelpInter", HELP_LAUNCH_INTERACTIVE, 0 },
			{NULL, 0, 0}
		}
	};
	ro_gui_browser_window_menu =
			ro_gui_menu_define_menu(&browser_definition);

}


/* exported interface documented in riscos/window.h */
nserror
ro_gui_window_invalidate_area(struct gui_window *g, const struct rect *rect)
{
	bool use_buffer;
	int x0, y0, x1, y1;
	struct update_box *cur;
	wimp_window_info info;
	os_error *error;

	assert(g);

	if (rect == NULL) {
		info.w = g->window;
		error = xwimp_get_window_info_header_only(&info);
		if (error) {
			NSLOG(netsurf, INFO,
			      "xwimp_get_window_info_header_only: 0x%x: %s",
			      error->errnum,
			      error->errmess);
			ro_warn_user("WimpError", error->errmess);
			return NSERROR_INVALID;
		}

		error = xwimp_force_redraw(g->window,
					   info.extent.x0, info.extent.y0,
					   info.extent.x1, info.extent.y1);
		if (error) {
			NSLOG(netsurf, INFO, "xwimp_force_redraw: 0x%x: %s",
			      error->errnum, error->errmess);
			ro_warn_user("WimpError", error->errmess);
			return NSERROR_INVALID;
		}
		return NSERROR_OK;
	}

	x0 = floorf(rect->x0 * 2 );
	y0 = -ceilf(rect->y1 * 2 );
	x1 = ceilf(rect->x1 * 2 ) + 1;
	y1 = -floorf(rect->y0 * 2 ) + 1;
	use_buffer =
		(g->option.buffer_everything || g->option.buffer_animations);

	/* try to optimise buffered redraws */
	if (use_buffer) {
		for (cur = pending_updates; cur != NULL; cur = cur->next) {
			if ((cur->g != g) || (!cur->use_buffer)) {
				continue;
			}
			if ((((cur->x0 - x1) < MARGIN) ||
			     ((cur->x1 - x0) < MARGIN)) &&
			    (((cur->y0 - y1) < MARGIN) ||
			     ((cur->y1 - y0) < MARGIN))) {
				cur->x0 = min(cur->x0, x0);
				cur->y0 = min(cur->y0, y0);
				cur->x1 = max(cur->x1, x1);
				cur->y1 = max(cur->y1, y1);
				return NSERROR_OK;
			}
		}
	}
	cur = malloc(sizeof(struct update_box));
	if (!cur) {
		NSLOG(netsurf, INFO, "No memory for malloc.");
		return NSERROR_NOMEM;
	}

	cur->x0 = x0;
	cur->y0 = y0;
	cur->x1 = x1;
	cur->y1 = y1;
	cur->next = pending_updates;
	pending_updates = cur;
	cur->g = g;
	cur->use_buffer = use_buffer;

	return NSERROR_OK;
}


/* exported function documented in riscos/window.h */
nserror ro_gui_window_set_url(struct gui_window *g, nsurl *url)
{
	size_t idn_url_l;
	char *idn_url_s = NULL;

	if (g->toolbar) {
		if (nsoption_bool(display_decoded_idn) == true) {
			if (nsurl_get_utf8(url, &idn_url_s, &idn_url_l) != NSERROR_OK)
				idn_url_s = NULL;
		}

		ro_toolbar_set_url(g->toolbar, idn_url_s ? idn_url_s : nsurl_access(url), true, false);

		if (idn_url_s)
			free(idn_url_s);

		ro_gui_url_complete_start(g->toolbar);
	}

	return NSERROR_OK;
}


/* exported interface documented in riscos/window.h */
void ro_gui_window_set_scale(struct gui_window *g, float scale)
{
	browser_window_set_scale(g->bw, scale, true);
}


/* exported interface documented in riscos/window.h */
bool ro_gui_window_dataload(struct gui_window *g, wimp_message *message)
{
	os_error *error;
	os_coord pos;

	/* Ignore directories etc. */
	if (0x1000 <= message->data.data_xfer.file_type)
		return false;

	if (!ro_gui_window_to_window_pos(g, message->data.data_xfer.pos.x,
			message->data.data_xfer.pos.y, &pos))
		return false;

	if (browser_window_drop_file_at_point(g->bw, pos.x, pos.y,
			message->data.data_xfer.file_name) == false)
		return false;

	/* send DataLoadAck */
	message->action = message_DATA_LOAD_ACK;
	message->your_ref = message->my_ref;
	error = xwimp_send_message(wimp_USER_MESSAGE, message, message->sender);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_send_message: 0x%x: %s\n",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
	}

	return true;
}


/* exported interface documented in riscos/window.h */
void ro_gui_window_mouse_at(wimp_pointer *pointer, void *data)
{
	os_coord pos;
	struct gui_window *g = (struct gui_window *) data;

	if (ro_gui_window_to_window_pos(g, pointer->pos.x, pointer->pos.y, &pos)) {
		browser_window_mouse_track(
			g->bw,
			ro_gui_mouse_drag_state(pointer->buttons,
						wimp_BUTTON_DOUBLE_CLICK_DRAG),
			pos.x,
			pos.y);
	}
}


/* exported interface documented in riscos/window.h */
void
ro_gui_window_iconise(struct gui_window *g, wimp_full_message_window_info *wi)
{
	/* sadly there is no 'legal' way to get the sprite into
	 * the Wimp sprite pool other than via a filing system */
	const char *temp_fname = "Pipe:$._tmpfile";
	struct browser_window *bw = g->bw;
	osspriteop_header *overlay = NULL;
	osspriteop_header *sprite_header;
	struct bitmap *bitmap;
	osspriteop_area *area;
	int width = 34, height = 34;
	struct hlcache_handle *h;
	os_error *error;
	int len, id;

	assert(bw);

	h = browser_window_get_content(bw);
	if (!h) return;

	/* if an overlay sprite is defined, locate it and gets its dimensions
	 * so that we can produce a thumbnail with the same dimensions */
	if (!ro_gui_wimp_get_sprite("ic_netsfxx", &overlay)) {
		error = xosspriteop_read_sprite_info(osspriteop_PTR,
				(osspriteop_area *)0x100,
				(osspriteop_id)overlay, &width, &height, NULL,
				NULL);
		if (error) {
			NSLOG(netsurf, INFO,
			      "xosspriteop_read_sprite_info: 0x%x: %s",
			      error->errnum,
			      error->errmess);
			ro_warn_user("MiscError", error->errmess);
			overlay = NULL;
		} else if (sprite_bpp(overlay) != 8) {
			NSLOG(netsurf, INFO, "overlay sprite is not 8bpp");
			overlay = NULL;
		}
	}

	/* create the thumbnail sprite */
	bitmap = riscos_bitmap_create(width, height,
			BITMAP_NEW | BITMAP_OPAQUE | BITMAP_CLEAR_MEMORY);
	if (!bitmap) {
		NSLOG(netsurf, INFO, "Thumbnail initialisation failed.");
		return;
	}
	riscos_bitmap_render(bitmap, h);
	if (overlay) {
		riscos_bitmap_overlay_sprite(bitmap, overlay);
	}
	area = riscos_bitmap_convert_8bpp(bitmap);
	riscos_bitmap_destroy(bitmap);
	if (!area) {
		NSLOG(netsurf, INFO, "Thumbnail conversion failed.");
		return;
	}

	/* choose a suitable sprite name */
	id = 0;
	while (iconise_used[id])
		if ((unsigned)++id >= NOF_ELEMENTS(iconise_used)) {
			id = iconise_next;
			if ((unsigned)++iconise_next >=
					NOF_ELEMENTS(iconise_used))
				iconise_next = 0;
			break;
		}

	sprite_header = (osspriteop_header *)(area + 1);
	len = sprintf(sprite_header->name, "ic_netsf%.2d", id);

	error = xosspriteop_save_sprite_file(osspriteop_USER_AREA,
			area, temp_fname);
	if (error) {
		NSLOG(netsurf, INFO, "xosspriteop_save_sprite_file: 0x%x:%s",
		      error->errnum, error->errmess);
		ro_warn_user("MiscError", error->errmess);
		free(area);
		return;
	}

	error = xwimpspriteop_merge_sprite_file(temp_fname);
	if (error) {
		NSLOG(netsurf, INFO,
		      "xwimpspriteop_merge_sprite_file: 0x%x:%s",
		      error->errnum,
		      error->errmess);
		ro_warn_user("WimpError", error->errmess);
		remove(temp_fname);
		free(area);
		return;
	}

	memcpy(wi->sprite_name, sprite_header->name + 3, len - 2); /* inc NUL */
	strncpy(wi->title, g->title, sizeof(wi->title));
	wi->title[sizeof(wi->title) - 1] = '\0';

	if (wimptextop_string_width(wi->title, 0) > 182) {
		/* work around bug in Pinboard where it will fail to display
		 * the icon if the text is very wide */
		if (strlen(wi->title) > 10)
			wi->title[10] = '\0';	/* pinboard does this anyway */
		while (wimptextop_string_width(wi->title, 0) > 182)
			wi->title[strlen(wi->title) - 1] = '\0';
	}

	wi->size = sizeof(wimp_full_message_window_info);
	wi->your_ref = wi->my_ref;
	error = xwimp_send_message(wimp_USER_MESSAGE, (wimp_message*)wi,
			wi->sender);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_send_message: 0x%x:%s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
	}
	else {
		g->iconise_icon = id;
		iconise_used[id] = true;
	}

	free(area);
}


/* exported interface documented in riscos/window.h */
bool ro_gui_toolbar_dataload(struct gui_window *g, wimp_message *message)
{
	if (message->data.data_xfer.file_type == osfile_TYPE_TEXT &&
			ro_gui_window_import_text(g,
					message->data.data_xfer.file_name)) {
		os_error *error;

		/* send DataLoadAck */
		message->action = message_DATA_LOAD_ACK;
		message->your_ref = message->my_ref;
		error = xwimp_send_message(wimp_USER_MESSAGE, message,
				message->sender);
		if (error) {
			NSLOG(netsurf, INFO,
			      "xwimp_send_message: 0x%x: %s\n",
			      error->errnum,
			      error->errmess);
			ro_warn_user("WimpError", error->errmess);
		}
		return true;
	}
	return false;
}


/* exported interface documented in riscos/window.h */
bool ro_gui_window_check_menu(wimp_menu *menu)
{
	return (ro_gui_browser_window_menu == menu) ? true : false;
}


/* exported interface documented in riscos/window.h */
void ro_gui_window_redraw_all(void)
{
	struct gui_window *g;
	for (g = window_list; g; g = g->next) {
		ro_gui_window_invalidate_area(g, NULL);
	}
}


/* exported interface documented in riscos/window.h */
void ro_gui_window_update_boxes(void)
{
	osbool more;
	bool use_buffer;
	wimp_draw update;
	struct rect clip;
	os_error *error;
	struct update_box *cur;
	struct gui_window *g;
	struct redraw_context ctx = {
		.interactive = true,
		.background_images = true,
		.plot = &ro_plotters
	};

	for (cur = pending_updates; cur != NULL; cur = cur->next) {
		g = cur->g;
		if (!g)
			continue;

		use_buffer = cur->use_buffer;

		update.w = g->window;
		update.box.x0 = cur->x0;
		update.box.y0 = cur->y0;
		update.box.x1 = cur->x1;
		update.box.y1 = cur->y1;

		error = xwimp_update_window(&update, &more);
		if (error) {
			NSLOG(netsurf, INFO, "xwimp_update_window: 0x%x: %s",
			      error->errnum, error->errmess);
			ro_warn_user("WimpError", error->errmess);
			continue;
		}

		/* Set the current redraw gui_window to get options from */
		ro_gui_current_redraw_gui = g;

		ro_plot_origin_x = update.box.x0 - update.xscroll;
		ro_plot_origin_y = update.box.y1 - update.yscroll;

		while (more) {
			clip.x0 = (update.clip.x0 - ro_plot_origin_x) / 2;
			clip.y0 = (ro_plot_origin_y - update.clip.y1) / 2;
			clip.x1 = (update.clip.x1 - ro_plot_origin_x) / 2;
			clip.y1 = (ro_plot_origin_y - update.clip.y0) / 2;

			if (use_buffer)
				ro_gui_buffer_open(&update);

			browser_window_redraw(g->bw, 0, 0, &clip, &ctx);

			if (use_buffer)
				ro_gui_buffer_close();

			error = xwimp_get_rectangle(&update, &more);
			/* RISC OS 3.7 returns an error here if enough buffer
			 * was claimed to cause a new dynamic area to be
			 * created. It doesn't actually stop anything working,
			 * so we mask it out for now until a better fix is
			 * found. This appears to be a bug in RISC OS. */
			if (error && !(use_buffer &&
					error->errnum == error_WIMP_GET_RECT)) {
				NSLOG(netsurf, INFO,
				      "xwimp_get_rectangle: 0x%x: %s",
				      error->errnum,
				      error->errmess);
				ro_warn_user("WimpError", error->errmess);
				ro_gui_current_redraw_gui = NULL;
				continue;
			}
		}

		/* Reset the current redraw gui_window to prevent
		 * thumbnails from retaining options */
		ro_gui_current_redraw_gui = NULL;
	}
	while (pending_updates) {
		cur = pending_updates;
		pending_updates = pending_updates->next;
		free(cur);
	}
}


/* exported interface documented in riscos/window.h */
void ro_gui_window_quit(void)
{
	while (window_list) {
		struct gui_window *cur = window_list;
		window_list = window_list->next;

		browser_window_destroy(cur->bw);
	}
}


/* exported interface documented in riscos/window.h */
void ro_gui_throb(void)
{
	struct gui_window *g;

	for (g = window_list; g; g = g->next) {
		if (!g->active)
			continue;
		if (g->toolbar != NULL)
			ro_toolbar_throb(g->toolbar);
	}
}


/* exported interface documented in riscos/window.h */
void ro_gui_window_default_options(struct gui_window *gui)
{
	float cscale;

	if (gui == NULL)
		return;

	cscale = browser_window_get_scale(gui->bw);

	/*	Save the basic options	*/
	nsoption_set_int(scale, cscale * 100);
	nsoption_set_bool(buffer_animations, gui->option.buffer_animations);
	nsoption_set_bool(buffer_everything, gui->option.buffer_everything);

	/*	Set up the toolbar	*/
	if (gui->toolbar != NULL) {
		nsoption_set_bool(toolbar_show_buttons,
				  ro_toolbar_get_display_buttons(gui->toolbar));
		nsoption_set_bool(toolbar_show_address,
				  ro_toolbar_get_display_url(gui->toolbar));
		nsoption_set_bool(toolbar_show_throbber,
				  ro_toolbar_get_display_throbber(gui->toolbar));
	}
	if (gui->status_bar != NULL) {
		nsoption_set_int(toolbar_status_size,
				 ro_gui_status_bar_get_width(gui->status_bar));
	}
}


/* exported interface documented in riscos/window.h */
struct gui_window *ro_gui_window_lookup(wimp_w window)
{
	struct gui_window *g;
	for (g = window_list; g; g = g->next) {
		if (g->window == window) {
			return g;
		}
	}
	return NULL;
}


/* exported interface documented in riscos/window.h */
struct gui_window *ro_gui_toolbar_lookup(wimp_w window)
{
	struct gui_window	*g = NULL;
	struct toolbar		*toolbar;
	wimp_w			parent;

	toolbar = ro_toolbar_window_lookup(window);

	if (toolbar != NULL) {
		parent = ro_toolbar_get_parent_window(toolbar);
		g = ro_gui_window_lookup(parent);
	}

	return g;
}


/* exported interface documented in riscos/window.h */
bool
ro_gui_window_to_window_pos(struct gui_window *g, int x, int y, os_coord *pos)
{
	wimp_window_state state;
	os_error *error;

	assert(g);

	state.w = g->window;
	error = xwimp_get_window_state(&state);
	if (error) {
		NSLOG(netsurf, INFO, "xwimp_get_window_state: 0x%x:%s",
		      error->errnum, error->errmess);
		ro_warn_user("WimpError", error->errmess);
		return false;
	}
	pos->x = (x - (state.visible.x0 - state.xscroll)) / 2 ;
	pos->y = ((state.visible.y1 - state.yscroll) - y) / 2 ;
	return true;
}


/* exported interface documented in riscos/window.h */
enum browser_mouse_state
ro_gui_mouse_click_state(wimp_mouse_state buttons, wimp_icon_flags type)
{
	browser_mouse_state state = 0; /* Blank state with nothing set */
	static struct {
		enum { CLICK_SINGLE, CLICK_DOUBLE, CLICK_TRIPLE } type;
		uint64_t time;
	} last_click;

	switch (type) {
	case wimp_BUTTON_CLICK_DRAG:
		/* Handle single clicks. */

		/* We fire core PRESS and CLICK events together for "action on
		 * press" behaviour. */
		if (buttons & (wimp_CLICK_SELECT)) /* Select click */
			state |= BROWSER_MOUSE_PRESS_1 | BROWSER_MOUSE_CLICK_1;
		if (buttons & (wimp_CLICK_ADJUST)) /* Adjust click */
			state |= BROWSER_MOUSE_PRESS_2 | BROWSER_MOUSE_CLICK_2;
		break;

	case wimp_BUTTON_DOUBLE_CLICK_DRAG:
		/* Handle single, double, and triple clicks. */

		/* Single clicks: Fire PRESS and CLICK events together
		 * for "action on press" behaviour. */
		if (buttons & (wimp_SINGLE_SELECT)) {
			/* Select single click */
			state |= BROWSER_MOUSE_PRESS_1 | BROWSER_MOUSE_CLICK_1;
		} else if (buttons & (wimp_SINGLE_ADJUST)) {
			/* Adjust single click */
			state |= BROWSER_MOUSE_PRESS_2 | BROWSER_MOUSE_CLICK_2;
		}

		/* Double clicks: Fire PRESS, CLICK, and DOUBLE_CLICK
		 * events together for "action on 2nd press" behaviour. */
		if (buttons & (wimp_DOUBLE_SELECT)) {
			/* Select double click */
			state |= BROWSER_MOUSE_PRESS_1 | BROWSER_MOUSE_CLICK_1 |
					BROWSER_MOUSE_DOUBLE_CLICK;
		} else if (buttons & (wimp_DOUBLE_ADJUST)) {
			/* Adjust double click */
			state |= BROWSER_MOUSE_PRESS_2 | BROWSER_MOUSE_CLICK_2 |
					BROWSER_MOUSE_DOUBLE_CLICK;
		}

		/* Need to consider what we have and decide whether to fire
		 * triple click instead */
		if ((state == (BROWSER_MOUSE_PRESS_1 |
				BROWSER_MOUSE_CLICK_1)) ||
		    (state == (BROWSER_MOUSE_PRESS_2 |
				BROWSER_MOUSE_CLICK_2))) {
			/* WIMP told us single click, but maybe we want to call
			 * it a triple click */

			if (last_click.type == CLICK_DOUBLE) {
				uint64_t ms_now;
				nsu_getmonotonic_ms(&ms_now);

				if (ms_now < (last_click.time + 500)) {
					/* Triple click!  Fire PRESS, CLICK, and
					 * TRIPLE_CLICK events together for
					 * "action on 3nd press" behaviour. */
					last_click.type = CLICK_TRIPLE;
					state |= BROWSER_MOUSE_TRIPLE_CLICK;
				} else {
					/* Single click */
					last_click.type = CLICK_SINGLE;
				}
			} else {
				/* Single click */
				last_click.type = CLICK_SINGLE;
			}
		} else if ((state == (BROWSER_MOUSE_PRESS_1 |
					BROWSER_MOUSE_CLICK_1 |
					BROWSER_MOUSE_DOUBLE_CLICK)) ||
			   (state == (BROWSER_MOUSE_PRESS_2 |
					BROWSER_MOUSE_CLICK_2 |
					BROWSER_MOUSE_DOUBLE_CLICK))) {
			/* Wimp told us double click, but we may want to
			 * call it single click */

			if (last_click.type == CLICK_TRIPLE) {
				state &= ~BROWSER_MOUSE_DOUBLE_CLICK;
				last_click.type = CLICK_SINGLE;
			} else {
				last_click.type = CLICK_DOUBLE;
				nsu_getmonotonic_ms(&last_click.time);
			}
		} else {
			last_click.type = CLICK_SINGLE;
		}
		break;
	}

	/* Check if a drag has started */
	if (buttons & (wimp_DRAG_SELECT)) {
		/* A drag was _started_ with Select; Fire DRAG_1. */
		state |= BROWSER_MOUSE_DRAG_1;
		mouse_drag_select = true;
	}
	if (buttons & (wimp_DRAG_ADJUST)) {
		/* A drag was _started_ with Adjust; Fire DRAG_2. */
		state |= BROWSER_MOUSE_DRAG_2;
		mouse_drag_adjust = true;
	}

	/* Set modifier key state */
	if (ro_gui_shift_pressed()) state |= BROWSER_MOUSE_MOD_1;
	if (ro_gui_ctrl_pressed())  state |= BROWSER_MOUSE_MOD_2;
	if (ro_gui_alt_pressed())   state |= BROWSER_MOUSE_MOD_3;

	return state;
}


/* exported interface documented in riscos/window.h */
browser_mouse_state
ro_gui_mouse_drag_state(wimp_mouse_state buttons, wimp_icon_flags type)
{
	browser_mouse_state state = 0; /* Blank state with nothing set */

	/* If mouse buttons aren't held, turn off drags */
	if (!(buttons & (wimp_CLICK_SELECT | wimp_CLICK_ADJUST))) {
		mouse_drag_select = false;
		mouse_drag_adjust = false;
	}

	/* If there's a drag happening, set DRAG_ON and record which button
	 * the drag is happening with, i.e. HOLDING_1 or HOLDING_2 */
	if (mouse_drag_select) {
		state |= BROWSER_MOUSE_DRAG_ON | BROWSER_MOUSE_HOLDING_1;
	}
	if (mouse_drag_adjust) {
		state |= BROWSER_MOUSE_DRAG_ON | BROWSER_MOUSE_HOLDING_2;
	}

	/* Set modifier key state */
	if (ro_gui_shift_pressed()) state |= BROWSER_MOUSE_MOD_1;
	if (ro_gui_ctrl_pressed())  state |= BROWSER_MOUSE_MOD_2;
	if (ro_gui_alt_pressed())   state |= BROWSER_MOUSE_MOD_3;

	return state;
}


/* exported interface documented in riscos/window.h */
bool ro_gui_shift_pressed(void)
{
	int shift = 0;
	xosbyte1(osbyte_SCAN_KEYBOARD, 0 ^ 0x80, 0, &shift);
	return (shift == 0xff);
}


/* exported interface documented in riscos/window.h */
bool ro_gui_ctrl_pressed(void)
{
	int ctrl = 0;
	xosbyte1(osbyte_SCAN_KEYBOARD, 1 ^ 0x80, 0, &ctrl);
	return (ctrl == 0xff);
}


/* exported interface documented in riscos/window.h */
bool ro_gui_alt_pressed(void)
{
	int alt = 0;
	xosbyte1(osbyte_SCAN_KEYBOARD, 2 ^ 0x80, 0, &alt);
	return (alt == 0xff);
}


/* exported interface documented in riscos/window.h */
void gui_window_set_pointer(struct gui_window *g, gui_pointer_shape shape)
{
	static gui_pointer_shape curr_pointer = GUI_POINTER_DEFAULT;
	struct ro_gui_pointer_entry *entry;
	os_error *error;

	if (shape == curr_pointer)
		return;

	assert(shape < sizeof ro_gui_pointer_table /
			sizeof ro_gui_pointer_table[0]);

	entry = &ro_gui_pointer_table[shape];

	if (entry->wimp_area) {
		/* pointer in the Wimp's sprite area */
		error = xwimpspriteop_set_pointer_shape(entry->sprite_name,
				1, entry->xactive, entry->yactive, 0, 0);
		if (error) {
			NSLOG(netsurf, INFO,
			      "xwimpspriteop_set_pointer_shape: 0x%x: %s",
			      error->errnum,
			      error->errmess);
			ro_warn_user("WimpError", error->errmess);
		}
	} else {
		/* pointer in our own sprite area */
		error = xosspriteop_set_pointer_shape(osspriteop_USER_AREA,
				gui_sprites,
				(osspriteop_id) entry->sprite_name,
				1, entry->xactive, entry->yactive, 0, 0);
		if (error) {
			NSLOG(netsurf, INFO,
			      "xosspriteop_set_pointer_shape: 0x%x: %s",
			      error->errnum,
			      error->errmess);
			ro_warn_user("WimpError", error->errmess);
		}
	}

	curr_pointer = shape;
}
