Question

我有这个方法，我需要应用程序等待，直到通过移动方法显示gui中的操作我是怎么做到的？

void move (char c)
    {
        if (c == 't' || c == 'k')
        {
            KeyEventArgs e1 = new KeyEventArgs(Keyboard.PrimaryDevice, Keyboard.PrimaryDevice.ActiveSource, 0, Key.Down) { RoutedEvent = Keyboard.KeyDownEvent };
            InputManager.Current.ProcessInput(e1);

        }
        else if (c == 'l')
        {
            KeyEventArgs e1 = new KeyEventArgs(Keyboard.PrimaryDevice, Keyboard.PrimaryDevice.ActiveSource, 0, Key.Left) { RoutedEvent = Keyboard.KeyDownEvent };
            InputManager.Current.ProcessInput(e1);
        }
        else if (c == 'r')
        {
            KeyEventArgs e1 = new KeyEventArgs(Keyboard.PrimaryDevice, Keyboard.PrimaryDevice.ActiveSource, 0, Key.Right) { RoutedEvent = Keyboard.KeyDownEvent };
            InputManager.Current.ProcessInput(e1);
        }


        //System.Threading.Thread.Sleep(1000);
        Timer.Stop();
    }

Answer 1

你要么让你的动作线程在运行时对键盘进行采样，然后对按下的内容采取行动而不是对事件采取行动

或

使用您的事件在您的VM上设置待处理操作标志，然后让您的操作线程将其用作输入而不是键盘

这是这种方法的一个例子

按下复选框后，

此应用程序将每隔2秒将您的操作写入屏幕

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:WPF_ScratchPad"
    xmlns:ComponentModel="clr-namespace:System.ComponentModel;assembly=WindowsBase" 
    x:Class="WPF_ScratchPad.MainWindow"
    mc:Ignorable="d"
    Title="MainWindow"
    Height="350"
    Width="525" KeyUp="Window_KeyUp">
    <Window.DataContext>
        <local:VM/>
    </Window.DataContext>
    <Window.InputBindings>
        <KeyBinding Gesture="Up" Command="{Binding SetAction}" >
            <KeyBinding.CommandParameter>
                <local:GameAction>MoveUp</local:GameAction>
            </KeyBinding.CommandParameter>
        </KeyBinding>
        <KeyBinding Gesture="Down" Command="{Binding SetAction}" >
            <KeyBinding.CommandParameter>
                <local:GameAction>MoveDown</local:GameAction>
            </KeyBinding.CommandParameter>
        </KeyBinding>
        <KeyBinding Gesture="Left" Command="{Binding SetAction}" >
            <KeyBinding.CommandParameter>
                <local:GameAction>MoveLeft</local:GameAction>
            </KeyBinding.CommandParameter>
        </KeyBinding>
        <KeyBinding Gesture="Right" Command="{Binding SetAction}" >
            <KeyBinding.CommandParameter>
                <local:GameAction>MoveRight</local:GameAction>
            </KeyBinding.CommandParameter>
        </KeyBinding>
    </Window.InputBindings>
    <StackPanel>
        <CheckBox IsChecked="{Binding Running}"/>
        <TextBlock Text="{Binding ActionText}" TextWrapping="Wrap"/>
    </StackPanel>
</Window>

背后的代码

private void Window_KeyUp(object sender, KeyEventArgs e)
{
    (DataContext as VM).Action = GameAction.None;
}

操作定义为

public enum GameAction
{
    None,
    MoveUp,
    MoveDown,
    Moveleft,
    MoveRight,
}

和ViewModel为

public class VM:BindableBase
{
    public VM()
    {
        SetAction = new DelegateCommand<GameAction?>(a => Action = a ?? GameAction.None);
    }

    private string _ActionText;

    public string ActionText
    {
        get { return _ActionText; }
        set { SetProperty(ref _ActionText, value); }
    }

    private bool _Running = false;

    public bool Running
    {
        get { return _Running; }
        set
        {
            if(SetProperty(ref _Running, value))
            {
                if (Running)
                    StartGame();
            }
        }
    }


    public GameAction Action { get; set; }
    public DelegateCommand<GameAction?> SetAction { get; set; }
    public Task ActionThread { get; set; }

    public void StartGame()
    {
        if (ActionThread == null)
        {
            ActionThread = Task.Run((Action) GameLoop); 
        }
    }
    public async void GameLoop ()
    {
        while(Running)
        {
            switch (Action)
            {
                case GameAction.MoveUp:
                    ActionText += $"{DateTime.Now.ToLongTimeString()} Up";
                    break;
                case GameAction.MoveDown:
                    ActionText += $"{DateTime.Now.ToLongTimeString()} Down";
                    break;
                case GameAction.Moveleft:
                    ActionText += $"{DateTime.Now.ToLongTimeString()} Left";
                    break;
                case GameAction.MoveRight:
                    ActionText += $"{DateTime.Now.ToLongTimeString()} Right";
                    break;
                default:
                    ActionText += $"{DateTime.Now.ToLongTimeString()} No Move";
                    break;
            }

            await Task.Delay(2000);//wait 2 seconds
        }
        ActionThread = null;
    }
}

注意使用棱镜

如何在WPF中按键显示移动？

1 个答案: