Add Continuous mode to ctx.memory.options

crates/eframe/src/native/epi_integration.rs

@@ -283,10 +283,11 @@ impl EpiIntegration {
 
         let full_output = self.egui_ctx.run(raw_input, |egui_ctx| {
             if let Some(viewport_ui_cb) = viewport_ui_cb {
-                // Child viewport
+                // Child Deferred Viewport
                 crate::profile_scope!("viewport_callback");
                 viewport_ui_cb(egui_ctx);
             } else {
+                // ROOT Viewport ( with Immediate Viewport )
                 crate::profile_scope!("App::update");
                 app.update(egui_ctx, &mut self.frame);
             }

crates/egui/src/context.rs

@@ -1977,7 +1977,7 @@ impl ContextImpl {
             .graphics
             .drain(self.memory.areas().order(), &self.memory.layer_transforms);
 
-        let mut repaint_needed = false;
+        let mut repaint_needed = self.memory.options.continuous_mode;
 
         {
             if self.memory.options.repaint_on_widget_change {

crates/egui/src/memory.rs

@@ -191,6 +191,10 @@ pub struct Options {
     /// Controls the tessellator.
     pub tessellation_options: epaint::TessellationOptions,
 
+    /// If `true`, This will call `egui::Context::request_repaint()` at the end of each frame
+    /// If `false` (default), egui is only updated if are input events (like mouse movements) or there are some animations in the GUI.
+    pub continuous_mode: bool,
+
     /// If any widget moves or changes id, repaint everything.
     ///
     /// It is recommended you keep this OFF, because
@@ -230,6 +234,7 @@ impl Default for Options {
             zoom_factor: 1.0,
             zoom_with_keyboard: true,
             tessellation_options: Default::default(),
+            continuous_mode: false,
             repaint_on_widget_change: false,
             screen_reader: false,
             preload_font_glyphs: true,
@@ -246,6 +251,7 @@ impl Options {
             zoom_factor: _, // TODO(emilk)
             zoom_with_keyboard,
             tessellation_options,
+            continuous_mode,
             repaint_on_widget_change,
             screen_reader: _, // needs to come from the integration
             preload_font_glyphs: _,
@@ -257,6 +263,8 @@ impl Options {
         CollapsingHeader::new("⚙ Options")
             .default_open(false)
             .show(ui, |ui| {
+                ui.checkbox(continuous_mode, "Repaint at the end of each frame");
+
                 ui.checkbox(
                     repaint_on_widget_change,
                     "Repaint if any widget moves or changes id",

crates/egui_demo_app/src/backend_panel.rs

@@ -65,10 +65,11 @@ impl BackendPanel {
         match self.run_mode {
             RunMode::Continuous => {
                 // Tell the backend to repaint as soon as possible
-                ctx.request_repaint();
+                ctx.options_mut(|options| options.continuous_mode = true);
             }
             RunMode::Reactive => {
                 // let the computer rest for a bit
+                ctx.options_mut(|options| options.continuous_mode = false);
             }
         }
     }