release keys for flutter input source

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

flutter/lib/common/widgets/remote_input.dart

@@ -34,7 +34,8 @@ class RawKeyFocusScope extends StatelessWidget {
             canRequestFocus: true,
             focusNode: focusNode,
             onFocusChange: onFocusChange,
-            onKey: inputModel.handleRawKeyEvent,
+            onKey: (FocusNode data, RawKeyEvent e) =>
+                inputModel.handleRawKeyEvent(e),
             child: child));
   }
 }

flutter/lib/models/input_model.dart

@@ -52,6 +52,111 @@ class PointerEventToRust {
   }
 }
 
+class ToReleaseKeys {
+  RawKeyEvent? lastLShiftKeyEvent;
+  RawKeyEvent? lastRShiftKeyEvent;
+  RawKeyEvent? lastLCtrlKeyEvent;
+  RawKeyEvent? lastRCtrlKeyEvent;
+  RawKeyEvent? lastLAltKeyEvent;
+  RawKeyEvent? lastRAltKeyEvent;
+  RawKeyEvent? lastLCommandKeyEvent;
+  RawKeyEvent? lastRCommandKeyEvent;
+  RawKeyEvent? lastSuperKeyEvent;
+
+  reset() {
+    lastLShiftKeyEvent = null;
+    lastRShiftKeyEvent = null;
+    lastLCtrlKeyEvent = null;
+    lastRCtrlKeyEvent = null;
+    lastLAltKeyEvent = null;
+    lastRAltKeyEvent = null;
+    lastLCommandKeyEvent = null;
+    lastRCommandKeyEvent = null;
+    lastSuperKeyEvent = null;
+  }
+
+  updateKeyDown(LogicalKeyboardKey logicKey, RawKeyDownEvent e) {
+    if (e.isAltPressed) {
+      if (logicKey == LogicalKeyboardKey.altLeft) {
+        lastLAltKeyEvent = e;
+      } else if (logicKey == LogicalKeyboardKey.altRight) {
+        lastRAltKeyEvent = e;
+      }
+    } else if (e.isControlPressed) {
+      if (logicKey == LogicalKeyboardKey.controlLeft) {
+        lastLCtrlKeyEvent = e;
+      } else if (logicKey == LogicalKeyboardKey.controlRight) {
+        lastRCtrlKeyEvent = e;
+      }
+    } else if (e.isShiftPressed) {
+      if (logicKey == LogicalKeyboardKey.shiftLeft) {
+        lastLShiftKeyEvent = e;
+      } else if (logicKey == LogicalKeyboardKey.shiftRight) {
+        lastRShiftKeyEvent = e;
+      }
+    } else if (e.isMetaPressed) {
+      if (logicKey == LogicalKeyboardKey.metaLeft) {
+        lastLCommandKeyEvent = e;
+      } else if (logicKey == LogicalKeyboardKey.metaRight) {
+        lastRCommandKeyEvent = e;
+      } else if (logicKey == LogicalKeyboardKey.superKey) {
+        lastSuperKeyEvent = e;
+      }
+    }
+  }
+
+  updateKeyUp(LogicalKeyboardKey logicKey, RawKeyUpEvent e) {
+    if (e.isAltPressed) {
+      if (logicKey == LogicalKeyboardKey.altLeft) {
+        lastLAltKeyEvent = null;
+      } else if (logicKey == LogicalKeyboardKey.altRight) {
+        lastRAltKeyEvent = null;
+      }
+    } else if (e.isControlPressed) {
+      if (logicKey == LogicalKeyboardKey.controlLeft) {
+        lastLCtrlKeyEvent = null;
+      } else if (logicKey == LogicalKeyboardKey.controlRight) {
+        lastRCtrlKeyEvent = null;
+      }
+    } else if (e.isShiftPressed) {
+      if (logicKey == LogicalKeyboardKey.shiftLeft) {
+        lastLShiftKeyEvent = null;
+      } else if (logicKey == LogicalKeyboardKey.shiftRight) {
+        lastRShiftKeyEvent = null;
+      }
+    } else if (e.isMetaPressed) {
+      if (logicKey == LogicalKeyboardKey.metaLeft) {
+        lastLCommandKeyEvent = null;
+      } else if (logicKey == LogicalKeyboardKey.metaRight) {
+        lastRCommandKeyEvent = null;
+      } else if (logicKey == LogicalKeyboardKey.superKey) {
+        lastSuperKeyEvent = null;
+      }
+    }
+  }
+
+  release(KeyEventResult Function(RawKeyEvent e) handleRawKeyEvent) {
+    for (final key in [
+      lastLShiftKeyEvent,
+      lastRShiftKeyEvent,
+      lastLCtrlKeyEvent,
+      lastRCtrlKeyEvent,
+      lastLAltKeyEvent,
+      lastRAltKeyEvent,
+      lastLCommandKeyEvent,
+      lastRCommandKeyEvent,
+      lastSuperKeyEvent,
+    ]) {
+      if (key != null) {
+        handleRawKeyEvent(RawKeyUpEvent(
+          data: key.data,
+          character: key.character,
+        ));
+      }
+    }
+  }
+}
+
 class InputModel {
   final WeakReference<FFI> parent;
   String keyboardMode = "legacy";
@@ -62,6 +167,8 @@ class InputModel {
   var alt = false;
   var command = false;
 
+  final ToReleaseKeys toReleaseKeys = ToReleaseKeys();
+
   // trackpad
   var _trackpadLastDelta = Offset.zero;
   var _stopFling = true;
@@ -89,7 +196,7 @@ class InputModel {
     sessionId = parent.target!.sessionId;
   }
 
-  KeyEventResult handleRawKeyEvent(FocusNode data, RawKeyEvent e) {
+  KeyEventResult handleRawKeyEvent(RawKeyEvent e) {
     if (isDesktop && !isInputSourceFlutter) {
       return KeyEventResult.handled;
     }
@@ -114,6 +221,7 @@ class InputModel {
           command = true;
         }
       }
+      toReleaseKeys.updateKeyDown(key, e);
     }
     if (e is RawKeyUpEvent) {
       if (key == LogicalKeyboardKey.altLeft ||
@@ -130,6 +238,8 @@ class InputModel {
           key == LogicalKeyboardKey.superKey) {
         command = false;
       }
+
+      toReleaseKeys.updateKeyUp(key, e);
     }
 
     // * Currently mobile does not enable map mode
@@ -319,6 +429,8 @@ class InputModel {
   }
 
   void enterOrLeave(bool enter) {
+    toReleaseKeys.release(handleRawKeyEvent);
+
     // Fix status
     if (!enter) {
       resetModifiers();