UIElement.CaptureMouse 方法

public:
 virtual bool CaptureMouse();

public bool CaptureMouse();

abstract member CaptureMouse : unit -> bool
override this.CaptureMouse : unit -> bool

Public Function CaptureMouse () As Boolean

傳回

true如果老鼠被成功捕獲;否則，。 false

實作

範例

以下範例實作了一對用於滑鼠與按鍵輸入組合的處理器，負責捕捉（與解開）滑鼠，並啟用一種特殊的滑鼠模式以觀看 3D 模型。

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

    if (Keyboard.IsKeyDown(Key.F1))
    {
        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))
        _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)
    {
        _rotation = _rotationDelta * _rotation;
    }
    else
    {
        _translate += _translateDelta;
        _translateDelta.X = 0;
        _translateDelta.Y = 0;
    }

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

Private Sub MouseDownHandler(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
    If Not Enabled Then
        Return
    End If
    e.Handled = True


    If Keyboard.IsKeyDown(Key.F1) = True Then
        Reset()
        Return
    End If

    Dim el As UIElement = CType(sender, UIElement)
    _point = e.MouseDevice.GetPosition(el)
    ' Initialize the center of rotation to the lookatpoint
    If Not _centered Then
        Dim camera As ProjectionCamera = CType(_slaves(0).Camera, ProjectionCamera)
        _center = camera.LookDirection
        _centered = True
    End If

    _scaling = (e.MiddleButton = MouseButtonState.Pressed)

    If Keyboard.IsKeyDown(Key.Space) = False Then
        _rotating = True
    Else
        _rotating = False
    End If

    el.CaptureMouse()
End Sub

Private Sub MouseUpHandler(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
    If Not _enabled Then
        Return
    End If
    e.Handled = True

    ' Stuff the current initial + delta into initial so when we next move we
    ' start at the right place.
    If _rotating = True Then
        _rotation = _rotationDelta * _rotation
    Else
        _translate += _translateDelta
        _translateDelta.X = 0
        _translateDelta.Y = 0
    End If

    '_scale = _scaleDelta * _scale
    Dim el As UIElement = CType(sender, UIElement)
    el.ReleaseMouseCapture()
End Sub

備註

要被捕獲，必須啟用元素。 在打電話前IsEnabled確認是否true存在CaptureMouse。

若呼叫 CaptureMouse 返回 true，則 IsMouseCaptured 也是 true。

若呼叫 CaptureMouse 回傳 true，則 GotMouseCapture 會觸發 和 IsMouseCapturedChanged 事件，事件 RoutedEventArgs.Source 中資料為方法被呼叫的元素 CaptureMouse 。 如果你強制吃子，可能會干擾現有的吃子——尤其是那些用滑鼠拖放的吃子。

要清除所有元素中的滑鼠捕捉，請以參數Mouse.Capture呼叫elementnull。

另請參閱

• IsMouseCaptured