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

下列範例會針對滑鼠和按鍵輸入組合, 執行一組處理常式來捕捉 (和 uncapture) 滑鼠, 並啟用特殊的滑鼠模式來觀看3D 模型。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

若要加以捕獲, 必須啟用元素。To be captured, an element must be enabled. 請檢查IsEnabled是否true在呼叫CaptureMouse之前。Check whether IsEnabled is true before you call CaptureMouse.

如果呼叫CaptureMouse true傳回,IsMouseCaptured則也true會是。If calling CaptureMouse returns true, then IsMouseCaptured is also true.

如果呼叫CaptureMouse RoutedEventArgs.Source CaptureMouse IsMouseCapturedChanged傳回, 則會引發和事件,並在事件資料中回報為呼叫方法的元素。GotMouseCapture trueIf 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 capture, 可能會干擾現有的捕捉, 特別是與滑鼠拖放相關的捕捉。If you force capture, you might interfere with existing captures - especially with captures that relate to drag-and-drop with the mouse.

若要清除所有元素的滑鼠捕捉, Mouse.Capture請使用element提供null的參數呼叫。To clear mouse capture from all elements, call Mouse.Capture with the element parameter provided as null.

適用於

另請參閱