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Better horizontal scroll for Tree 

* Adds pan gesture support for horizontal scroll.
* Scrolls horizontally when needed to ensure cursor visiblility.
This commit is contained in:
Haoyu Qiu 2020-01-03 18:29:22 +08:00
parent 9d3424f61d
commit 229b398146
1 changed files with 43 additions and 21 deletions
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62
scene/gui/tree.cpp
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@ -2745,9 +2745,13 @@ void Tree::_gui_input(Ref<InputEvent> p_event) {
Ref<InputEventPanGesture> pan_gesture = p_event;
if (pan_gesture.is_valid()) {
double prev_value = v_scroll->get_value();
double prev_v = v_scroll->get_value();
v_scroll->set_value(v_scroll->get_value() + v_scroll->get_page() * pan_gesture->get_delta().y / 8);
if (v_scroll->get_value() != prev_value) {
double prev_h = h_scroll->get_value();
h_scroll->set_value(h_scroll->get_value() + h_scroll->get_page() * pan_gesture->get_delta().x / 8);
if (v_scroll->get_value() != prev_v || h_scroll->get_value() != prev_h) {
accept_event();
}
}
@ -3455,30 +3459,48 @@ int Tree::get_item_offset(TreeItem *p_item) const {
}
void Tree::ensure_cursor_is_visible() {
if (!is_inside_tree())
if (!is_inside_tree()) {
return;
}
if (!selected_item || (selected_col == -1)) {
return; // Nothing under cursor.
}
TreeItem *selected = get_selected();
if (!selected)
return;
int ofs = get_item_offset(selected);
if (ofs == -1)
return;
const Size2 area_size = get_size() - cache.bg->get_minimum_size();
int y_offset = get_item_offset(selected_item);
if (y_offset != -1) {
const int tbh = _get_title_button_height();
ofs -= tbh;
y_offset -= tbh;
const int marginh = cache.bg->get_margin(MARGIN_TOP) + cache.bg->get_margin(MARGIN_BOTTOM);
int h = compute_item_height(selected) + cache.vseparation;
int screenh = get_size().height - h_scroll->get_combined_minimum_size().height - marginh - tbh;
const int cell_h = compute_item_height(selected_item) + cache.vseparation;
const int screen_h = area_size.height - h_scroll->get_combined_minimum_size().height - tbh;
if (h > screenh) { //screen size is too small, maybe it was not resized yet.
v_scroll->set_value(ofs);
} else if (ofs + h > v_scroll->get_value() + screenh) {
v_scroll->call_deferred("set_value", ofs - screenh + h);
} else if (ofs < v_scroll->get_value()) {
v_scroll->set_value(ofs);
if (cell_h > screen_h) { // Screen size is too small, maybe it was not resized yet.
v_scroll->set_value(y_offset);
} else if (y_offset + cell_h > v_scroll->get_value() + screen_h) {
v_scroll->call_deferred("set_value", y_offset - screen_h + cell_h);
} else if (y_offset < v_scroll->get_value()) {
v_scroll->set_value(y_offset);
}
}
if (select_mode != SELECT_ROW) { // Cursor always at col 0 in this mode.
int x_offset = 0;
for (int i = 0; i < selected_col; i++) {
x_offset += get_column_width(i);
}
const int cell_w = get_column_width(selected_col);
const int screen_w = area_size.width - v_scroll->get_combined_minimum_size().width;
if (cell_w > screen_w) {
h_scroll->set_value(x_offset);
} else if (x_offset + cell_w > h_scroll->get_value() + screen_w) {
h_scroll->call_deferred("set_value", x_offset - screen_w + cell_w);
} else if (x_offset < h_scroll->get_value()) {
h_scroll->set_value(x_offset);
}
}
}