Button touchDown 和 Button touchUp 事件

Question

我正在开发 Windows Universal App（Windows 8.1 + Winwdows Phone 8.1）。我可以在 Button 上检测到 Click 事件：

<Button x:Name="menuButton" Click="menuButton_Click" />

我还想检测该按钮上的“按下”事件和“释放”事件。按下按钮时，我必须更改应用程序中的图像。当按钮被释放时，图像返回到它的初始状态。我检查了与Button 类相关的方法，但似乎没有什么可以帮助我。提前谢谢你。

Answer 1

你必须像这样实现它

public class MyButton : Button
{
    public event RoutedEventHandler MyPointerPressed;
    public event RoutedEventHandler MyPointerReleased;
    public event RoutedEventHandler MyPointerExited;
    public event RoutedEventHandler MyPointerMoved;

    public event EventHandler HoldingStarted;

    protected override void OnPointerPressed(PointerRoutedEventArgs e)
    {
        base.OnPointerPressed(e);

        MyPointerPressed?.Invoke(this, e);
    }

    protected override void OnPointerMoved(PointerRoutedEventArgs e)
    {
        base.OnPointerMoved(e);

        MyPointerMoved?.Invoke(this, e);
    }

    protected override void OnPointerReleased(PointerRoutedEventArgs e)
    {
        base.OnPointerReleased(e);

        MyPointerReleased?.Invoke(this, e);
    }

    protected override void OnPointerExited(PointerRoutedEventArgs e)
    {
        base.OnPointerExited(e);

        MyPointerExited?.Invoke(this, e);
    }

    protected override void OnHolding(HoldingRoutedEventArgs e)
    {
        if (e.HoldingState == HoldingState.Started)
        {
            HoldingStarted?.Invoke(this, new EventArgs());
            return;
        }

        base.OnHolding(e);
    }
}