Question

我有一个 Main_Form_Keydown和Keyup功能，用键盘控制机器人。 问题 如果我失去了主窗口窗口的焦点我无法再控制机器人，除非我再次关注 ，这是一个问题，因为我这样做可能会使机器人崩溃。

我有什么想法可以改进我的代码吗？

      public void Main_Form_KeyDown(object sender, KeyEventArgs e) //Controlo do drone com o teclado
    {
        switch (e.KeyCode) //Controlo pelo Teclado
        {
            case Keys.F:
                _droneClient.FlatTrim();
                break;
            case Keys.Back:
                if (!isSensitiveMode)
                {
                    flightSensitivityConst = 0.25f;
                    isSensitiveMode = true;
                }
                else
                {
                    flightSensitivityConst = 0.9f;
                    isSensitiveMode = false;
                }
                break;
            case Keys.W:
                _droneClient.Progress(FlightMode.Progressive, pitch: -flightSensitivityConst);
                break;
            case Keys.S:
                _droneClient.Progress(FlightMode.Progressive, pitch: +flightSensitivityConst);
                break;
            case Keys.A:
                _droneClient.Progress(FlightMode.Progressive, roll: -flightSensitivityConst);
                break;
            case Keys.D:
                _droneClient.Progress(FlightMode.Progressive, roll: +flightSensitivityConst);
                break;
            case Keys.I:
                _droneClient.Progress(FlightMode.Progressive, gaz: +flightSensitivityConst);
                break;
            case Keys.K:
                _droneClient.Progress(FlightMode.Progressive, gaz: -flightSensitivityConst);
                break;
            case Keys.J:
                _droneClient.Progress(FlightMode.Progressive, yaw: -flightSensitivityConst);
                break;
            case Keys.L:
                _droneClient.Progress(FlightMode.Progressive, yaw: +flightSensitivityConst);
                break;
            case Keys.E:
                _droneClient.Takeoff();
                break;
            case Keys.Q:
                _droneClient.Emergency();
                break;
            case Keys.Space:
                _droneClient.Land();
                break;
            //FLIPS
            case Keys.P:
                _settings.Control.FlightAnimation = new FlightAnimation(FlightAnimationType.FlipLeft);
                _droneClient.Send(_settings);
                //FLIP
                break;
            case Keys.O:
                _settings.Control.FlightAnimation = new FlightAnimation(FlightAnimationType.FlipRight);
                _droneClient.Send(_settings);
                //FLIP
                break;
            case Keys.Y:
                _settings.Control.FlightAnimation = new FlightAnimation(FlightAnimationType.FlipBehind);
                _droneClient.Send(_settings);
                break;
            case Keys.U:
                _settings.Control.FlightAnimation = new FlightAnimation(FlightAnimationType.FlipAhead);
                _droneClient.Send(_settings);
                break;
            case Keys.C:
                var configuration = new Settings();
                configuration.Video.Channel = VideoChannelType.Next;
                _droneClient.Send(configuration);
                break;
            case Keys.R:
                string path = string.Format("ttu_flight_{0:yyyy_MM_dd_HH_mm}" + ARDroneTrackFileExt, DateTime.Now);
                using (var dialog = new SaveFileDialog { DefaultExt = ARDroneTrackFileExt, Filter = ARDroneTrackFilesFilter, FileName = path })
                {
                    if (dialog.ShowDialog(this) == DialogResult.OK)
                    {
                        StopRecording();

                        _recorderStream = new FileStream(dialog.FileName, FileMode.OpenOrCreate);
                        _packetRecorderWorker = new PacketRecorder(_recorderStream);
                        _packetRecorderWorker.Start();
                    }
                }
                break;
        }
    } //Controlo do drone através do teclado

    private void Main_Form_KeyUp(object sender, KeyEventArgs e) //Se nao estiver a ser comandado pelo teclado
    {
        _droneClient.Hover(); //Fica pairado
    }

我正在考虑在计时器上使用普通函数，但它会缺少KeyEventArgs e

Answer 1

使用全局密钥钩子。当您的窗口没有焦点时，这也会捕获键（请参阅：http://www.codeproject.com/Articles/19004/A-Simple-C-Global-Low-Level-Keyboard-Hook或Global keyboard capture in C# application）。

或者，您可以捕获表单的LostFocus事件，然后中断程序，直到表单再次聚焦为止。

如何提高KeyDown功能

1 个答案: