onFocusChanged property

Implementation

Stream<bool> get onFocusChanged {
  if (_focusController != null) {
    return _focusController!.stream;
  }

  if (isWeb) {
    return WebUtils.onFocusChanged;
  } else if (isDesktop) {
    _WindowListener listener = _WindowListener(
      onBlur: () => _focusController!.add(false),
      onFocus: () => _focusController!.add(true),
    );

    _focusController = StreamController<bool>.broadcast(
      onListen: () => WindowManager.instance.addListener(listener),
      onCancel: () {
        WindowManager.instance.removeListener(listener);
        _focusController?.close();
        _focusController = null;
      },
    );
  } else {
    Worker? worker;

    _focusController = StreamController<bool>.broadcast(
      onListen:
          () =>
              worker = ever(
                router.lifecycle,
                (AppLifecycleState a) =>
                    _focusController?.add(a.inForeground),
              ),
      onCancel: () {
        worker?.dispose();
        _focusController?.close();
        _focusController = null;
      },
    );
  }

  return _focusController!.stream;
}