Windows platforms do not support a maximize call in onDoubleTapDown

[luoluoqixi]

windowManager.maximize() doesn't work when I change onDoubleTap to onDoubleTapDown (only windows)

@override
  Widget build(BuildContext context) {
    return GestureDetector(
      behavior: HitTestBehavior.translucent,
      onPanStart: (details) {
        windowManager.startDragging();
      },
      onDoubleTapDown: (details) async {
        bool isMaximized = await windowManager.isMaximized();
        if (!isMaximized) {
          await windowManager.maximize();
        } else {
          await windowManager.unmaximize();
        }
      },
      child: child,
    );
  }

A simple fix looks like this:

onDoubleTapDown: (details) async {
  final isFix = Platform.isWindows;
  bool alwaysTop = false;
  if (isFix) {
    alwaysTop = await windowManager.isAlwaysOnTop();
    await windowManager.setAlwaysOnTop(true);
    await windowManager.blur();
  }
  bool isMaximized = await windowManager.isMaximized();
  if (!isMaximized) {
    await windowManager.maximize();
  } else {
    await windowManager.unmaximize();
  }
  if (isFix) {
    await windowManager.focus();
    await windowManager.setAlwaysOnTop(alwaysTop);
  }
},

[luoluoqixi]

I found a way to solve it, just send WM_LBUTTONUP before performing maximize

// dart
onDoubleTapDown: (details) async {
    if (Platform.isWindows) {
      // windows平台鼠标按下时maximize不生效, 强行释放一下鼠标
      await windowsInterface.releaseMouse();
    }
    bool isMaximized = await windowManager.isMaximized();
    if (!isMaximized) {
      await windowManager.maximize();
    } else {
      await windowManager.unmaximize();
    }
    _isDoubleTapped = true;
}

// c++
void WindowsInterface::ReleaseMouse() {
  HWND hwnd = GetMainWindow();
  ReleaseCapture();
  SendMessage(hwnd, WM_LBUTTONUP, 0, MAKELPARAM(0, 0));
}

[luoluoqixi]

Can you replace the default onDoubleTap with this onDoubleTapDown implementation? Because if you look at the other applications in Windows, they are all maximized at the moment of onDoubleTapDown