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treeview: Support scrolling to the highlighted node 

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>
This commit is contained in:
Daniel Silverstone 2019-08-02 21:34:53 +01:00
parent 813a284e9e
commit acad436d68
1 changed files with 36 additions and 0 deletions
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36
desktop/treeview.c
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@ -564,6 +564,32 @@ static int treeview_node_y(
}
/**
* Corewindow callback_wrapper: Scroll to make node visible
*
* \param[in] tree The treeview to scroll.
* \param[in] node The treeview node to scroll to visibility.
*/
static inline void treeview__cw_scroll_to_node(
const struct treeview *tree,
const struct treeview_node *node)
{
struct rect r = {
.x0 = 0,
.y0 = treeview_node_y(tree, node),
.x1 = 1,
.y1 = ((node->type == TREE_NODE_ENTRY) ?
node->height : tree_g.line_height),
};
r.y1 += r.y0; /* Apply the Y offset to the second Y coordinate */
if (tree->cw_t != NULL) {
tree->cw_t->scroll_visible(tree->cw_h, &r);
}
}
/**
* Redraw tree from given node to the bottom.
*
@ -3805,6 +3831,7 @@ treeview_keyboard_navigation(treeview *tree, uint32_t key, struct rect *rect)
int search_height = treeview__get_search_height(tree);
int h = treeview__get_display_height(tree) + search_height;
bool redraw = false;
struct treeview_node *scroll_to_node = NULL;
/* Fill out the nav. state struct, by examining the current selection
* state */
@ -3812,6 +3839,8 @@ treeview_keyboard_navigation(treeview *tree, uint32_t key, struct rect *rect)
TREEVIEW_WALK_MODE_DISPLAY, NULL,
treeview_node_nav_cb, &ns);
scroll_to_node = ns.curr;
if (tree->search.search == false) {
if (ns.next == NULL)
ns.next = tree->root->children;
@ -3832,10 +3861,12 @@ treeview_keyboard_navigation(treeview *tree, uint32_t key, struct rect *rect)
ns.curr->parent->type != TREE_NODE_ROOT) {
/* Step to parent */
ns.curr->parent->flags |= TV_NFLAGS_SELECTED;
scroll_to_node = ns.curr->parent;
} else if (ns.curr != NULL && tree->root->children != NULL) {
/* Select first node in tree */
tree->root->children->flags |= TV_NFLAGS_SELECTED;
scroll_to_node = tree->root->children;
}
break;
@ -3848,6 +3879,7 @@ treeview_keyboard_navigation(treeview *tree, uint32_t key, struct rect *rect)
/* Step to first child */
ns.curr->children->flags |=
TV_NFLAGS_SELECTED;
scroll_to_node = ns.curr->children;
} else {
/* Retain current node selection */
ns.curr->flags |= TV_NFLAGS_SELECTED;
@ -3869,6 +3901,7 @@ treeview_keyboard_navigation(treeview *tree, uint32_t key, struct rect *rect)
if (ns.prev != NULL) {
/* Step to previous node */
ns.prev->flags |= TV_NFLAGS_SELECTED;
scroll_to_node = ns.prev;
}
break;
@ -3876,6 +3909,7 @@ treeview_keyboard_navigation(treeview *tree, uint32_t key, struct rect *rect)
if (ns.next != NULL) {
/* Step to next node */
ns.next->flags |= TV_NFLAGS_SELECTED;
scroll_to_node = ns.next;
}
break;
@ -3883,6 +3917,8 @@ treeview_keyboard_navigation(treeview *tree, uint32_t key, struct rect *rect)
break;
}
treeview__cw_scroll_to_node(tree, scroll_to_node);
/* TODO: Deal with redraw area properly */
rect->x0 = 0;
rect->y0 = 0;