UIElement.ReleaseMouseCapture 方法

定义

命名空间:

System.Windows

程序集:

PresentationCore.dll

如果此元素具有鼠标捕获，则释放该捕获。

C#

public void ReleaseMouseCapture ();

实现

ReleaseMouseCapture()

示例

以下示例与给定 CaptureMouse的示例并行：它处理鼠标按钮以释放鼠标捕获并重新启用鼠标移动。

C#

private void MouseDownHandler(object sender, MouseButtonEventArgs e)
{
    if (!Enabled) return;
    e.Handled = true;

    if (Keyboard.IsKeyDown(Key.F1) == true)
    {
        Reset();
        return;
    }

    UIElement el = (UIElement)sender;
    _point = e.MouseDevice.GetPosition(el);
    // Initialize the center of rotation to the lookatpoint
    if (!_centered)
    {
        ProjectionCamera camera = (ProjectionCamera)_slaves[0].Camera;
        _center = camera.LookDirection;
        _centered = true;
    }

    _scaling = (e.MiddleButton == MouseButtonState.Pressed);

    if (Keyboard.IsKeyDown(Key.Space) == false)
        _rotating = true;
    else
        _rotating = false;

    el.CaptureMouse();
}

private void MouseUpHandler(object sender, MouseButtonEventArgs e)
{
    if (!_enabled) return;
    e.Handled = true;

    // Stuff the current initial + delta into initial so when we next move we
    // start at the right place.
    if (_rotating == true)
    {
        _rotation = _rotationDelta * _rotation;
    }
    else
    {
        _translate += _translateDelta;
        _translateDelta.X = 0;
        _translateDelta.Y = 0;
    }

    //_scale = _scaleDelta*_scale;
    UIElement el = (UIElement)sender;
    el.ReleaseMouseCapture();
}

注解

如果此元素未保存捕获，则调用此方法不起作用。 请考虑在调用此方法之前检查其值 IsMouseCaptured 。

适用于

另请参阅

• IsMouseCaptured