[bench] benchmark demo app when everything is open

egui/benches/benchmark.rs

@@ -10,7 +10,21 @@ pub fn criterion_benchmark(c: &mut Criterion) {
         let mut ctx = egui::Context::new();
         let mut demo_app = egui::demos::DemoApp::default();
 
-        c.bench_function("demo_app", |b| {
+        c.bench_function("demo_app_minimal", |b| {
+            b.iter(|| {
+                let mut ui = ctx.begin_frame(raw_input.clone());
+                demo_app.ui(&mut ui, &Default::default());
+                ctx.end_frame()
+            })
+        });
+    }
+
+    {
+        let mut ctx = egui::Context::new();
+        ctx.memory().all_collpasing_are_open = true; // expand the demo window with everything
+        let mut demo_app = egui::demos::DemoApp::default();
+
+        c.bench_function("demo_app_full", |b| {
             b.iter(|| {
                 let mut ui = ctx.begin_frame(raw_input.clone());
                 demo_app.ui(&mut ui, &Default::default());

egui/src/containers/collapsing_header.rs

@@ -36,11 +36,15 @@ impl State {
 
     // Helper
     pub fn is_open(ctx: &Context, id: Id) -> Option<bool> {
+        if ctx.memory().all_collpasing_are_open {
+            Some(true)
+        } else {
             ctx.memory()
                 .collapsing_headers
                 .get(&id)
                 .map(|state| state.open)
         }
+    }
 
     pub fn toggle(&mut self, ui: &Ui) {
         self.open = !self.open;
@@ -49,7 +53,7 @@ impl State {
 
     /// 0 for closed, 1 for open, with tweening
     pub fn openness(&self, ctx: &Context, id: Id) -> f32 {
-        ctx.animate_bool(id, self.open)
+        ctx.animate_bool(id, self.open || ctx.memory().all_collpasing_are_open)
     }
 
     /// Show contents if we are open, with a nice animation between closed and open
@@ -91,7 +95,7 @@ impl State {
                 child_ui.force_set_min_rect(min_rect);
                 r
             }))
-        } else if self.open {
+        } else if self.open || ui.memory().all_collpasing_are_open {
             let ret_rect = ui.add_custom(add_contents);
             let full_size = ret_rect.1.size();
             self.open_height = Some(full_size.y);

egui/src/containers/window.rs

@@ -192,7 +192,7 @@ impl<'open> Window<'open> {
             collapsible,
         } = self;
 
-        if matches!(open, Some(false)) {
+        if matches!(open, Some(false)) && !ctx.memory().all_windows_are_open {
             return None;
         }
 
@@ -201,10 +201,11 @@ impl<'open> Window<'open> {
         let resize_id = window_id.with("resize");
         let collapsing_id = window_id.with("collapsing");
 
+        let is_maximized =
+            collapsing_header::State::is_open(ctx, collapsing_id).unwrap_or_default();
         let possible = PossibleInteractions {
             movable: area.is_movable(),
-            resizable: resize.is_resizable()
+            resizable: resize.is_resizable() && is_maximized,
-                && collapsing_header::State::is_open(ctx, collapsing_id).unwrap_or_default(),
         };
 
         let area = area.movable(false); // We move it manually

egui/src/memory.rs

@@ -49,6 +49,13 @@ pub struct Memory {
     /// Could be a combo box, color picker, menu etc.
     #[cfg_attr(feature = "serde", serde(skip))]
     popup: Option<Id>,
+
+    /// Useful for debugging, benchmarking etc.
+    pub all_collpasing_are_open: bool,
+    /// Useful for debugging, benchmarking etc.
+    pub all_menues_are_open: bool,
+    /// Useful for debugging, benchmarking etc.
+    pub all_windows_are_open: bool,
 }
 
 /// Say there is a button in a scroll area.

egui/src/menu.rs

@@ -93,7 +93,7 @@ fn menu_impl<'c>(
         bar_state.open_menu = Some(menu_id);
     }
 
-    if bar_state.open_menu == Some(menu_id) {
+    if bar_state.open_menu == Some(menu_id) || ui.memory().all_menues_are_open {
         let area = Area::new(menu_id)
             .order(Order::Foreground)
             .fixed_pos(button_response.rect.left_bottom());