refactor OverlayKeyState for OverlayDialogManager and ChatModel

flutter/lib/desktop/pages/file_manager_page.dart

@@ -80,6 +80,7 @@ class _FileManagerPageState extends State<FileManagerPage>
   Entry? _lastClickEntry;
 
   final _dropMaskVisible = false.obs; // TODO impl drop mask
+  final _overlayKeyState = OverlayKeyState();
 
   ScrollController getBreadCrumbScrollController(bool isLocal) {
     return isLocal ? _breadCrumbScrollerLocal : _breadCrumbScrollerRemote;
@@ -115,6 +116,7 @@ class _FileManagerPageState extends State<FileManagerPage>
     // register location listener
     _locationNodeLocal.addListener(onLocalLocationFocusChanged);
     _locationNodeRemote.addListener(onRemoteLocationFocusChanged);
+    _ffi.dialogManager.setOverlayState(_overlayKeyState);
   }
 
   @override
@@ -137,9 +139,8 @@ class _FileManagerPageState extends State<FileManagerPage>
   @override
   Widget build(BuildContext context) {
     super.build(context);
-    return Overlay(initialEntries: [
-      OverlayEntry(builder: (context) {
-        _ffi.dialogManager.setOverlayState(Overlay.of(context));
+    return Overlay(key: _overlayKeyState.key, initialEntries: [
+      OverlayEntry(builder: (_) {
         return ChangeNotifierProvider.value(
             value: _ffi.fileModel,
             child: Consumer<FileModel>(builder: (context, model, child) {

flutter/lib/desktop/pages/remote_page.dart

@@ -62,7 +62,7 @@ class _RemotePageState extends State<RemotePage>
   late RxBool _remoteCursorMoved;
   late RxBool _keyboardEnabled;
 
-  final overlayState = PenetrableOverlayState();
+  final _blockableOverlayState = BlockableOverlayState();
 
   final FocusNode _rawKeyFocusNode = FocusNode(debugLabel: "rawkeyFocusNode");
 
@@ -136,10 +136,11 @@ class _RemotePageState extends State<RemotePage>
     //   _isCustomCursorInited = true;
     // }
 
-    _ffi.chatModel.setPenetrableOverlayState(overlayState);
+    _ffi.dialogManager.setOverlayState(_blockableOverlayState);
+    _ffi.chatModel.setOverlayState(_blockableOverlayState);
     // make remote page penetrable automatically, effective for chat over remote
-    overlayState.onMiddleBlockedClick = () {
-      overlayState.setMiddleBlocked(false);
+    _blockableOverlayState.onMiddleBlockedClick = () {
+      _blockableOverlayState.setMiddleBlocked(false);
     };
   }
 
@@ -201,8 +202,11 @@ class _RemotePageState extends State<RemotePage>
   Widget buildBody(BuildContext context) {
     return Scaffold(
       backgroundColor: Theme.of(context).backgroundColor,
-      body: PenetrableOverlay(
-        state: overlayState,
+
+      /// the Overlay key will be set with _blockableOverlayState in BlockableOverlay
+      /// see override build() in [BlockableOverlay]
+      body: BlockableOverlay(
+        state: _blockableOverlayState,
         underlying: Container(
             color: Colors.black,
             child: RawKeyFocusScope(