refactor: optimize undecorated resizing handling (#8790)

* refactor: optimize undecorated resizing handling

* license

* separate modules

* fix windows

* rename export

* fix export

* same for gtk

* shared hit_test function

* change cursor on drag

* only set cursor on windows

* Revert "only set cursor on windows"

This reverts commit 03294a8.

* fix flickering on Windows, change cursor on motion on Linux

* remove changing cursor on move on linux

* fix linux implementation

* clippy

* Windows, on left click only

* prevent on fullscreen, use OS border size on Windows

* fix build

* clippy

---------

Co-authored-by: Lucas Nogueira <[email protected]>

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

@@ -114,6 +114,16 @@ use std::{
 pub type WebviewId = u32;
 type IpcHandler = dyn Fn(String) + 'static;
 
+#[cfg(any(
+  windows,
+  target_os = "linux",
+  target_os = "dragonfly",
+  target_os = "freebsd",
+  target_os = "netbsd",
+  target_os = "openbsd"
+))]
+mod undecorated_resizing;
+
 mod webview;
 pub use webview::Webview;
 
@@ -1858,6 +1868,9 @@ pub struct WindowWrapper {
   has_children: AtomicBool,
   webviews: Vec<WebviewWrapper>,
   window_event_listeners: WindowEventListeners,
+  #[cfg(windows)]
+  is_window_fullscreen: bool,
+  #[cfg(windows)]
   is_window_transparent: bool,
   #[cfg(windows)]
   surface: Option<softbuffer::Surface<Arc<Window>, Arc<Window>>>,
@@ -1868,7 +1881,6 @@ impl fmt::Debug for WindowWrapper {
     f.debug_struct("WindowWrapper")
       .field("label", &self.label)
       .field("inner", &self.inner)
-      .field("is_window_transparent", &self.is_window_transparent)
       .finish()
   }
 }
@@ -2603,6 +2615,10 @@ fn handle_user_message<T: UserEvent>(
             } else {
               window.set_fullscreen(None)
             }
+            #[cfg(windows)]
+            if let Some(w) = windows.borrow_mut().get_mut(&id) {
+              w.is_window_fullscreen = fullscreen;
+            }
           }
           WindowMessage::SetFocus => {
             window.set_focus();
@@ -2838,7 +2854,12 @@ fn handle_user_message<T: UserEvent>(
     },
     Message::CreateRawWindow(window_id, handler, sender) => {
       let (label, builder) = handler();
+
+      #[cfg(windows)]
+      let is_window_fullscreen = builder.window.fullscreen.is_some();
+      #[cfg(windows)]
       let is_window_transparent = builder.window.transparent;
+
       if let Ok(window) = builder.build(event_loop) {
         window_id_map.insert(window.id(), window_id);
 
@@ -2868,6 +2889,9 @@ fn handle_user_message<T: UserEvent>(
             inner: Some(window.clone()),
             window_event_listeners: Default::default(),
             webviews: Vec::new(),
+            #[cfg(windows)]
+            is_window_fullscreen,
+            #[cfg(windows)]
             is_window_transparent,
             #[cfg(windows)]
             surface,
@@ -3192,7 +3216,10 @@ fn create_window<T: UserEvent, F: Fn(RawWindow) + Send + 'static>(
 
   let window_event_listeners = WindowEventListeners::default();
 
+  #[cfg(windows)]
   let is_window_transparent = window_builder.inner.window.transparent;
+  #[cfg(windows)]
+  let is_window_fullscreen = window_builder.inner.window.fullscreen.is_some();
 
   #[cfg(target_os = "macos")]
   {
@@ -3324,6 +3351,9 @@ fn create_window<T: UserEvent, F: Fn(RawWindow) + Send + 'static>(
     inner: Some(window),
     webviews,
     window_event_listeners,
+    #[cfg(windows)]
+    is_window_fullscreen,
+    #[cfg(windows)]
     is_window_transparent,
     #[cfg(windows)]
     surface,
@@ -3413,6 +3443,11 @@ fn create_webview<T: UserEvent>(
     .with_transparent(webview_attributes.transparent)
     .with_accept_first_mouse(webview_attributes.accept_first_mouse);
 
+  #[cfg(windows)]
+  if kind == WebviewKind::WindowContent {
+    webview_builder = webview_builder.with_initialization_script(undecorated_resizing::SCRIPT);
+  }
+
   if webview_attributes.file_drop_handler_enabled {
     let proxy = context.proxy.clone();
     webview_builder = webview_builder.with_file_drop_handler(move |event| {
@@ -3541,15 +3576,14 @@ fn create_webview<T: UserEvent>(
     webview_builder = webview_builder.with_https_scheme(false);
   }
 
-  if let Some(handler) = ipc_handler {
-    webview_builder = webview_builder.with_ipc_handler(create_ipc_handler(
-      window_id,
-      id,
-      context.clone(),
-      label.clone(),
-      handler,
-    ));
-  }
+  webview_builder = webview_builder.with_ipc_handler(create_ipc_handler(
+    kind,
+    window_id,
+    id,
+    context.clone(),
+    label.clone(),
+    ipc_handler,
+  ));
 
   for (scheme, protocol) in uri_scheme_protocols {
     webview_builder =
@@ -3626,6 +3660,17 @@ fn create_webview<T: UserEvent>(
     .build()
     .map_err(|e| Error::CreateWebview(Box::new(e)))?;
 
+  #[cfg(any(
+    target_os = "linux",
+    target_os = "dragonfly",
+    target_os = "freebsd",
+    target_os = "netbsd",
+    target_os = "openbsd"
+  ))]
+  if kind == WebviewKind::WindowContent {
+    undecorated_resizing::attach_resize_handler(&webview);
+  }
+
   #[cfg(windows)]
   if kind == WebviewKind::WindowContent {
     let controller = webview.controller();
@@ -3679,24 +3724,34 @@ fn create_webview<T: UserEvent>(
 
 /// Create a wry ipc handler from a tauri ipc handler.
 fn create_ipc_handler<T: UserEvent>(
+  _kind: WebviewKind,
   window_id: WindowId,
   webview_id: WebviewId,
   context: Context<T>,
   label: String,
-  handler: WebviewIpcHandler<T, Wry<T>>,
+  ipc_handler: Option<WebviewIpcHandler<T, Wry<T>>>,
 ) -> Box<IpcHandler> {
   Box::new(move |request| {
-    handler(
-      DetachedWebview {
-        label: label.clone(),
-        dispatcher: WryWebviewDispatcher {
-          window_id,
-          webview_id,
-          context: context.clone(),
+    #[cfg(windows)]
+    if _kind == WebviewKind::WindowContent
+      && undecorated_resizing::handle_request(context.clone(), window_id, &request)
+    {
+      return;
+    }
+
+    if let Some(handler) = &ipc_handler {
+      handler(
+        DetachedWebview {
+          label: label.clone(),
+          dispatcher: WryWebviewDispatcher {
+            window_id,
+            webview_id,
+            context: context.clone(),
+          },
         },
-      },
-      request,
-    );
+        request,
+      );
+    }
   })
 }