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Center when scrolling to tree item.

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This commit is contained in:
Stijn Hinlopen
2020-07-05 20:06:51 +02:00
parent df1724470d
commit 31824420e4
5 changed files with 24 additions and 15 deletions
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28
scene/gui/tree.cpp
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@@ -4409,21 +4409,29 @@ Point2 Tree::get_scroll() const {
return ofs;
}
void Tree::scroll_to_item(TreeItem *p_item) {
void Tree::scroll_to_item(TreeItem *p_item, bool p_center_on_item) {
if (!is_visible_in_tree()) {
// hack to work around crash in get_item_rect() if Tree is not in tree.
return;
return; // Hack to work around crash in get_item_rect() if Tree is not in tree.
}
// make sure the scrollbar min and max are up to date with latest changes.
update_scrollbars();
const Rect2 r = get_item_rect(p_item);
const real_t tree_height = get_size().y;
const Rect2 item_rect = get_item_rect(p_item);
const real_t item_y = item_rect.position.y;
const real_t item_height = item_rect.size.y + cache.vseparation;
if (r.position.y <= v_scroll->get_value()) {
v_scroll->set_value(r.position.y);
} else if (r.position.y + r.size.y + 2 * cache.vseparation > v_scroll->get_value() + get_size().y) {
v_scroll->set_value(r.position.y + r.size.y + 2 * cache.vseparation - get_size().y);
if (p_center_on_item) {
v_scroll->set_value(item_y - (tree_height - item_height) / 2.0f);
} else {
if (item_y < v_scroll->get_value()) {
v_scroll->set_value(item_y);
} else {
const real_t new_position = item_y + item_height - tree_height;
if (new_position > v_scroll->get_value()) {
v_scroll->set_value(new_position);
}
}
}
}
@@ -4868,7 +4876,7 @@ void Tree::_bind_methods() {
ClassDB::bind_method(D_METHOD("get_column_title_language", "column"), &Tree::get_column_title_language);
ClassDB::bind_method(D_METHOD("get_scroll"), &Tree::get_scroll);
ClassDB::bind_method(D_METHOD("scroll_to_item", "item"), &Tree::scroll_to_item);
ClassDB::bind_method(D_METHOD("scroll_to_item", "item", "center_on_item"), &Tree::scroll_to_item, DEFVAL(false));
ClassDB::bind_method(D_METHOD("set_h_scroll_enabled", "h_scroll"), &Tree::set_h_scroll_enabled);
ClassDB::bind_method(D_METHOD("is_h_scroll_enabled"), &Tree::is_h_scroll_enabled);