fix, check session's keyboard mode on conn

Signed-off-by: fufesou <shuanglongchen@yeah.net>

flutter/lib/consts.dart

@@ -11,6 +11,10 @@ const int kMainWindowId = 0;
 
 const kAllDisplayValue = -1;
 
+const kKeyLegacyMode = 'legacy';
+const kKeyMapMode = 'map';
+const kKeyTranslateMode = 'translate';
+
 const String kPeerPlatformWindows = "Windows";
 const String kPeerPlatformLinux = "Linux";
 const String kPeerPlatformMacOS = "Mac OS";

flutter/lib/desktop/widgets/remote_toolbar.dart

@@ -26,10 +26,6 @@ import '../../common/shared_state.dart';
 import './popup_menu.dart';
 import './kb_layout_type_chooser.dart';
 
-const _kKeyLegacyMode = 'legacy';
-const _kKeyMapMode = 'map';
-const _kKeyTranslateMode = 'translate';
-
 class ToolbarState {
   final kStoreKey = 'remoteMenubarState';
   late RxBool show;
@@ -1406,18 +1402,16 @@ class _KeyboardMenu extends StatelessWidget {
   Widget build(BuildContext context) {
     var ffiModel = Provider.of<FfiModel>(context);
     if (!ffiModel.keyboard) return Offstage();
+    // If use flutter to grab keys, we can only use one mode.
+    // Map mode and Legacy mode, at least one of them is supported.
     String? modeOnly;
     if (stateGlobal.grabKeyboard) {
       if (bind.sessionIsKeyboardModeSupported(
-          sessionId: ffi.sessionId, mode: _kKeyMapMode)) {
-        bind.sessionSetKeyboardMode(
-            sessionId: ffi.sessionId, value: _kKeyMapMode);
-        modeOnly = _kKeyMapMode;
+          sessionId: ffi.sessionId, mode: kKeyMapMode)) {
+        modeOnly = kKeyMapMode;
       } else if (bind.sessionIsKeyboardModeSupported(
-          sessionId: ffi.sessionId, mode: _kKeyLegacyMode)) {
-        bind.sessionSetKeyboardMode(
-            sessionId: ffi.sessionId, value: _kKeyLegacyMode);
-        modeOnly = _kKeyLegacyMode;
+          sessionId: ffi.sessionId, mode: kKeyLegacyMode)) {
+        modeOnly = kKeyLegacyMode;
       }
     }
     return _IconSubmenuButton(
@@ -1439,13 +1433,13 @@ class _KeyboardMenu extends StatelessWidget {
   keyboardMode(String? modeOnly) {
     return futureBuilder(future: () async {
       return await bind.sessionGetKeyboardMode(sessionId: ffi.sessionId) ??
-          _kKeyLegacyMode;
+          kKeyLegacyMode;
     }(), hasData: (data) {
       final groupValue = data as String;
       List<InputModeMenu> modes = [
-        InputModeMenu(key: _kKeyLegacyMode, menu: 'Legacy mode'),
-        InputModeMenu(key: _kKeyMapMode, menu: 'Map mode'),
-        InputModeMenu(key: _kKeyTranslateMode, menu: 'Translate mode'),
+        InputModeMenu(key: kKeyLegacyMode, menu: 'Legacy mode'),
+        InputModeMenu(key: kKeyMapMode, menu: 'Map mode'),
+        InputModeMenu(key: kKeyTranslateMode, menu: 'Translate mode'),
       ];
       List<RdoMenuButton> list = [];
       final enabled = !ffi.ffiModel.viewOnly;
@@ -1463,12 +1457,12 @@ class _KeyboardMenu extends StatelessWidget {
           continue;
         }
 
-        if (pi.isWayland && mode.key != _kKeyMapMode) {
+        if (pi.isWayland && mode.key != kKeyMapMode) {
           continue;
         }
 
         var text = translate(mode.menu);
-        if (mode.key == _kKeyTranslateMode) {
+        if (mode.key == kKeyTranslateMode) {
           text = '$text beta';
         }
         list.add(RdoMenuButton<String>(

flutter/lib/models/model.dart

@@ -703,6 +703,10 @@ class FfiModel with ChangeNotifier {
     _pi.isSet.value = true;
     stateGlobal.resetLastResolutionGroupValues(peerId);
 
+    if (isDesktop) {
+      checkDesktopKeyboardMode();
+    }
+
     notifyListeners();
 
     if (!isCache) {
@@ -710,6 +714,36 @@ class FfiModel with ChangeNotifier {
     }
   }
 
+  checkDesktopKeyboardMode() async {
+    final curMode = await bind.sessionGetKeyboardMode(sessionId: sessionId);
+    if (curMode != null) {
+      if (bind.sessionIsKeyboardModeSupported(
+          sessionId: sessionId, mode: curMode)) {
+        return;
+      }
+    }
+
+    // If current keyboard mode is not supported, change to another one.
+
+    if (stateGlobal.grabKeyboard) {
+      for (final mode in [kKeyMapMode, kKeyLegacyMode]) {
+        if (bind.sessionIsKeyboardModeSupported(
+            sessionId: sessionId, mode: mode)) {
+          bind.sessionSetKeyboardMode(sessionId: sessionId, value: mode);
+          break;
+        }
+      }
+    } else {
+      for (final mode in [kKeyMapMode, kKeyTranslateMode, kKeyLegacyMode]) {
+        if (bind.sessionIsKeyboardModeSupported(
+            sessionId: sessionId, mode: mode)) {
+          bind.sessionSetKeyboardMode(sessionId: sessionId, value: mode);
+          break;
+        }
+      }
+    }
+  }
+
   tryUseAllMyDisplaysForTheRemoteSession(String peerId) async {
     if (bind.sessionGetUseAllMyDisplaysForTheRemoteSession(
             sessionId: sessionId) !=