feat(core): allow force redrawing of frames

CHANGELOG.md

@@ -25,6 +25,9 @@ Please only add new entries below the [Unreleased](#unreleased---releasedate) he
 
 ## [@Unreleased] - @ReleaseDate
 
+### Features
+- **core**: Add the ability to force redraw a frame. (#pr @zihadmahiuddin)
+
 ## [0.4.0-alpha.26] - 2025-02-05
 
 ### Fixed

core/src/test_helper.rs

@@ -105,7 +105,7 @@ impl TestWindow {
     self.run_frame_tasks();
 
     AppCtx::frame_ticks().clone().next(Instant::now());
-    self.0.draw_frame();
+    self.0.draw_frame(false);
   }
 }
 

core/src/window.rs

@@ -217,15 +217,15 @@ impl Window {
 
   /// Draw an image what current render tree represent.
   #[track_caller]
-  pub fn draw_frame(&self) -> bool {
+  pub fn draw_frame(&self, force: bool) -> bool {
     AppCtx::run_until_stalled();
     let mut ticker = self.frame_ticker.clone();
     ticker.next(FrameMsg::NewFrame(Instant::now()));
     self.run_frame_tasks();
 
     self.update_painter_viewport();
     let draw = self.need_draw() && !self.size().is_empty();
-    if draw {
+    if force || draw {
       let root = self.tree().root();
 
       let surface = {

ribir/src/app.rs

@@ -108,7 +108,7 @@ impl App {
               if wnd.is_visible() != Some(false) {
                 // if this frame is really draw, request another redraw. To make sure the draw
                 // always end with a empty draw and emit an extra tick cycle message.
-                if wnd.draw_frame() {
+                if wnd.draw_frame(false) {
                   request_redraw(&wnd);
                 }
               }