UIElement.CaptureMouse UIElement.CaptureMouse UIElement.CaptureMouse UIElement.CaptureMouse Method

定義

嘗試強制將滑鼠的捕捉給這個項目。Attempts to force capture of the mouse to this element.

public:
 virtual bool CaptureMouse();
public bool CaptureMouse ();
abstract member CaptureMouse : unit -> bool
override this.CaptureMouse : unit -> bool
Public Function CaptureMouse () As Boolean

傳回

如果成功捕捉到滑鼠則為 true,否則為 falsetrue if the mouse is successfully captured; otherwise, false.

實作

範例

下列範例會實作一組處理常式的滑鼠和輸入的按鍵組合的滑鼠捕捉 (和釋放),並啟用檢視 3D 模型的特殊滑鼠模式。The following example implements a pair of handlers for mouse and key input combination that capture (and uncapture) the mouse and enable a special mouse mode for viewing a 3D model.

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();
}
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

若要擷取項目必須先啟用。To be captured, an element must be enabled. 檢查是否IsEnabledtrue之前先呼叫CaptureMouseCheck whether IsEnabled is true before you call CaptureMouse.

如果呼叫CaptureMouse會傳回true,然後IsMouseCaptured也是trueIf calling CaptureMouse returns true, then IsMouseCaptured is also true.

如果呼叫CaptureMouse傳回true,則GotMouseCaptureIsMouseCapturedChanged引發事件,與RoutedEventArgs.Source事件中的項目報告資料其中CaptureMouse呼叫方法。If calling CaptureMouse returns true, then the GotMouseCapture and IsMouseCapturedChanged events are raised, with RoutedEventArgs.Source in the event data reported as the element where the CaptureMouse method is called. 如果您強制擷取時,您可能會干擾現有的擷取-特別是使用與拖曳和置放滑鼠的擷取。If you force capture, you might interfere with existing captures - especially with captures that relate to drag-and-drop with the mouse.

若要清除滑鼠捕捉,從所有的項目,請呼叫Mouse.Capture具有element提供的參數nullTo clear mouse capture from all elements, call Mouse.Capture with the element parameter provided as null.

適用於

另請參閱