Opt: enter or leave

flutter/lib/desktop/pages/remote_page.dart

@@ -517,6 +517,19 @@ class _RemotePageState extends State<RemotePage>
     }
   }
 
+  void enterView(PointerEnterEvent evt) {
+    if (!_imageFocused) {
+      _physicalFocusNode.requestFocus();
+    }
+    _cursorOverImage.value = true;
+    _ffi.enterOrLeave(true);
+  }
+
+  void leaveView(PointerExitEvent evt) {
+    _cursorOverImage.value = false;
+    _ffi.enterOrLeave(false);
+  }
+
   Widget _buildImageListener(Widget child) {
     return Listener(
         onPointerHover: _onPointHoverImage,
@@ -525,15 +538,8 @@ class _RemotePageState extends State<RemotePage>
         onPointerMove: _onPointMoveImage,
         onPointerSignal: _onPointerSignalImage,
         child: MouseRegion(
-            onEnter: (evt) {
-              if (!_imageFocused) {
-                _physicalFocusNode.requestFocus();
-              }
-              _cursorOverImage.value = true;
-            },
-            onExit: (evt) {
-              _cursorOverImage.value = false;
-            },
+            onEnter: enterView,
+            onExit: leaveView,
             child: child));
   }
 

flutter/lib/models/model.dart

@@ -1003,6 +1003,10 @@ class FFI {
         downOrUp: down);
   }
 
+  void enterOrLeave(bool enter) {
+    bind.sessionEnterOrLeave(id: id, enter: enter);
+  }
+
   /// Send key stroke event.
   /// [down] indicates the key's state(down or up).
   /// [press] indicates a click event(down and up).

src/flutter_ffi.rs

@@ -247,6 +247,16 @@ pub fn session_handle_flutter_key_event(
     }
 }
 
+pub fn session_enter_or_leave(id: String, enter: bool) {
+    if let Some(session) = SESSIONS.read().unwrap().get(&id) {
+        if enter {
+            session.enter();
+        } else {
+            session.leave();
+        }
+    }
+}
+
 pub fn session_input_key(
     id: String,
     name: String,