fix(windows): allow web fullscreen APIs to work

.changes/windows-fullscreen.md

@@ -0,0 +1,5 @@
+---
+tauri-runtime-wry: "patch:bug"
+---
+
+Allow web fullscreen APIs to work on Windows (e.g. `video.requestFullscreen` and `document.exitFullscreen`)

crates/tauri-runtime-wry/src/lib.rs

@@ -38,7 +38,7 @@ use tao::platform::unix::{WindowBuilderExtUnix, WindowExtUnix};
 #[cfg(windows)]
 use tao::platform::windows::{WindowBuilderExtWindows, WindowExtWindows};
 #[cfg(windows)]
-use webview2_com::FocusChangedEventHandler;
+use webview2_com::{ContainsFullScreenElementChangedEventHandler, FocusChangedEventHandler};
 #[cfg(windows)]
 use windows::Win32::Foundation::HWND;
 #[cfg(target_os = "ios")]
@@ -4821,8 +4821,7 @@ You may have it installed on another user account, but it is not available for t
   #[cfg(windows)]
   {
     let controller = webview.controller();
-    let proxy = context.proxy.clone();
-    let proxy_ = proxy.clone();
+    let proxy_clone = context.proxy.clone();
     let window_id_ = window_id.clone();
     let mut token = 0;
     unsafe {
@@ -4837,7 +4836,7 @@ You may have it installed on another user account, but it is not available for t
           focused_webview.replace(label_.clone());
 
           if !already_focused {
-            let _ = proxy.send_event(Message::Webview(
+            let _ = proxy_clone.send_event(Message::Webview(
               *window_id_.lock().unwrap(),
               id,
               WebviewMessage::SynthesizedWindowEvent(SynthesizedWindowEvent::Focused(true)),
@@ -4851,6 +4850,8 @@ You may have it installed on another user account, but it is not available for t
     .unwrap();
     unsafe {
       let label_ = label.clone();
+      let window_id_ = window_id.clone();
+      let proxy_clone = context.proxy.clone();
       controller.add_LostFocus(
         &FocusChangedEventHandler::create(Box::new(move |_, _| {
           let mut focused_webview = focused_webview.lock().unwrap();
@@ -4866,8 +4867,8 @@ You may have it installed on another user account, but it is not available for t
           if lost_window_focus {
             // only reset when we lost window focus - otherwise some other webview is focused
             *focused_webview = None;
-            let _ = proxy_.send_event(Message::Webview(
-              *window_id.lock().unwrap(),
+            let _ = proxy_clone.send_event(Message::Webview(
+              *window_id_.lock().unwrap(),
               id,
               WebviewMessage::SynthesizedWindowEvent(SynthesizedWindowEvent::Focused(false)),
             ));
@@ -4878,6 +4879,26 @@ You may have it installed on another user account, but it is not available for t
       )
     }
     .unwrap();
+
+    if let Ok(webview) = unsafe { controller.CoreWebView2() } {
+      let proxy_clone = context.proxy.clone();
+      unsafe {
+        let _ = webview.add_ContainsFullScreenElementChanged(
+          &ContainsFullScreenElementChangedEventHandler::create(Box::new(move |sender, _| {
+            let mut contains_fullscreen_element = windows::core::BOOL::default();
+            sender
+              .ok_or_else(windows::core::Error::empty)?
+              .ContainsFullScreenElement(&mut contains_fullscreen_element)?;
+            let _ = proxy_clone.send_event(Message::Window(
+              *window_id.lock().unwrap(),
+              WindowMessage::SetFullscreen(contains_fullscreen_element.as_bool()),
+            ));
+            Ok(())
+          })),
+          &mut token,
+        );
+      }
+    }
   }
 
   Ok(WebviewWrapper {