fix: dialog, trackpad speed, buttons (close -> ok, cancel) (#15918)

* fix: dialog, trackpad speed, buttons (close -> ok, cancel)

Signed-off-by: fufesou <linlong1266@gmail.com>

* fix(flutter): handle trackpad speed dialog submission

- commit typed values from Enter and OK
- validate input before saving
- prevent duplicate submissions
- surface save failures

Signed-off-by: fufesou <linlong1266@gmail.com>

* fix(flutter): sync trackpad speed input and slider

- handle trackpad speed submission from IME actions
- update the slider when a valid speed is typed
- cover Enter, OK, IME, and invalid input behavior

Signed-off-by: fufesou <linlong1266@gmail.com>

---------

Signed-off-by: fufesou <linlong1266@gmail.com>

flutter/lib/common/widgets/dialog.dart

@@ -1899,26 +1899,110 @@ customImageQualityDialog(SessionID sessionId, String id, FFI ffi) async {
   msgBoxCommon(ffi.dialogManager, 'Custom Image Quality', content, [btnClose]);
 }
 
-trackpadSpeedDialog(SessionID sessionId, FFI ffi) async {
-  int initSpeed = ffi.inputModel.trackpadSpeed;
+int? _validateTrackpadSpeed(String text) {
+  final speed = int.tryParse(text);
+  if (speed == null || speed < kMinTrackpadSpeed || speed > kMaxTrackpadSpeed) {
+    BotToast.showText(
+      text:
+          '${translate('Invalid format')}: $kMinTrackpadSpeed-$kMaxTrackpadSpeed',
+      contentColor: Colors.red,
+    );
+    return null;
+  }
+  return speed;
+}
+
+Future<void> _saveTrackpadSpeed({
+  required SessionID sessionId,
+  required FFI ffi,
+  required int initSpeed,
+  required int speed,
+}) async {
+  if (speed == initSpeed) {
+    return;
+  }
+  await bind.sessionSetTrackpadSpeed(sessionId: sessionId, value: speed);
+  await ffi.inputModel.updateTrackpadSpeed();
+}
+
+void _showTrackpadSpeedSaveError(Object error, StackTrace stackTrace) {
+  debugPrint('Failed to save trackpad speed: $error');
+  debugPrintStack(stackTrace: stackTrace);
+  BotToast.showText(
+    text: translate('Failed'),
+    contentColor: Colors.red,
+  );
+}
+
+List<Widget> _trackpadSpeedDialogActions({
+  required bool isSubmitting,
+  required VoidCallback close,
+  required VoidCallback submit,
+}) {
+  return [
+    dialogButton(
+      'Cancel',
+      icon: Icon(Icons.close_rounded),
+      onPressed: isSubmitting ? null : close,
+      isOutline: true,
+    ),
+    dialogButton(
+      'OK',
+      icon: Icon(Icons.done_rounded),
+      onPressed: isSubmitting ? null : submit,
+    ),
+  ];
+}
+
+void trackpadSpeedDialog(SessionID sessionId, FFI ffi) {
+  final initSpeed = ffi.inputModel.trackpadSpeed;
   final curSpeed = SimpleWrapper(initSpeed);
-  final btnClose = dialogButton('Close', onPressed: () async {
-    if (curSpeed.value <= kMaxTrackpadSpeed &&
-        curSpeed.value >= kMinTrackpadSpeed &&
-        curSpeed.value != initSpeed) {
-      await bind.sessionSetTrackpadSpeed(
-          sessionId: sessionId, value: curSpeed.value);
-      await ffi.inputModel.updateTrackpadSpeed();
+  var speedText = initSpeed.toString();
+  var isSubmitting = false;
+  ffi.dialogManager.show((setState, close, context) {
+    Future<void> submit([String? submittedText]) async {
+      if (isSubmitting) {
+        return;
+      }
+      speedText = submittedText ?? speedText;
+      final speed = _validateTrackpadSpeed(speedText);
+      if (speed == null) {
+        return;
+      }
+      setState(() => isSubmitting = true);
+      try {
+        await _saveTrackpadSpeed(
+          sessionId: sessionId,
+          ffi: ffi,
+          initSpeed: initSpeed,
+          speed: speed,
+        );
+        close();
+      } catch (error, stackTrace) {
+        _showTrackpadSpeedSaveError(error, stackTrace);
+        setState(() => isSubmitting = false);
+      }
     }
-    ffi.dialogManager.dismissAll();
-  });
-  msgBoxCommon(
-      ffi.dialogManager,
-      'Trackpad speed',
-      TrackpadSpeedWidget(
-        value: curSpeed,
+
+    return CustomAlertDialog(
+      title: Text(
+        translate('Trackpad speed'),
+        style: TextStyle(fontSize: 21),
       ),
-      [btnClose]);
+      content: TrackpadSpeedWidget(
+        value: curSpeed,
+        onTextChanged: (text) => speedText = text,
+        onTextSubmitted: submit,
+      ),
+      actions: _trackpadSpeedDialogActions(
+        isSubmitting: isSubmitting,
+        close: close,
+        submit: submit,
+      ),
+      onSubmit: isSubmitting ? null : submit,
+      onCancel: isSubmitting ? null : close,
+    );
+  });
 }
 
 void deleteConfirmDialog(Function onSubmit, String title) async {