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Panels: double-click resize edge to toggle (#8193)

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Double-clicking the edge of a resizable panel will now toggle it
collapsed/expanded
This commit is contained in:
Emil Ernerfeldt
2026-05-24 12:32:03 +02:00
committed by GitHub
parent 27559ef3fd
commit 22d1fa8f5b
1 changed files with 19 additions and 3 deletions
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22
crates/egui/src/containers/panel.rs
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@@ -384,6 +384,8 @@ impl Panel {
/// `is_expanded` is taken by `&mut` so the panel can flip it to `false` when
/// the user drags the resize handle past the panel's minimum size, and back
/// to `true` if the user drags the handle outward while the panel is closed.
/// When [`Self::resizable`] is `true`, double-clicking the resize edge also
/// flips `*is_expanded`.
pub fn show_collapsible<R>(
self,
ui: &mut Ui,
@@ -465,6 +467,9 @@ impl Panel {
/// the expanded panel's id), so a single uninterrupted drag can collapse and
/// re-expand the panel without releasing.
///
/// Double-clicking the resize edge also flips `*is_expanded` (whichever
/// panel is currently shown is the one whose edge you click).
///
/// ```
/// # egui::__run_test_ui(|ui| {
/// let mut is_expanded = true;
@@ -615,7 +620,7 @@ impl Panel {
fn show_inside_dyn<'c, R>(
self,
parent_ui: &mut Ui,
is_expanded: Option<&mut bool>,
mut is_expanded: Option<&mut bool>,
add_contents: Box<dyn FnOnce(&mut Ui) -> R + 'c>,
) -> InnerResponse<R> {
let side = self.side;
@@ -642,7 +647,18 @@ impl Panel {
// store-skipped-during-drag rule would leave the stored size at the
// pre-drag value.
let resize_id = self.resize_id_source.unwrap_or(id).with("__resize");
if let Some(resize_response) = parent_ui.read_response(resize_id)
let resize_response = parent_ui.read_response(resize_id);
// Double-click on the resize edge toggles `*is_expanded` for the
// animated entry points (`show_collapsible` / `show_switched`).
if let Some(resize_response) = resize_response.as_ref()
&& resize_response.double_clicked()
&& let Some(is_expanded) = is_expanded.as_deref_mut()
{
*is_expanded = !*is_expanded;
}
if let Some(resize_response) = resize_response
&& (resize_response.dragged() || resize_response.drag_stopped())
&& let Some(pointer) = resize_response.interact_pointer_pos()
{
@@ -891,7 +907,7 @@ impl Panel {
// `show_switched` share one resize widget.
let resize_id = self.resize_id_source.unwrap_or(self.id).with("__resize");
let resize_rect = Rect::from_x_y_ranges(resize_x, resize_y).expand2(amount);
let resize_response = ui.interact(resize_rect, resize_id, Sense::drag());
let resize_response = ui.interact(resize_rect, resize_id, Sense::click_and_drag());
(resize_response.hovered(), resize_response.dragged())
}