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

定義

この要素にマウスをキャプチャするように強制することを試みます。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

戻り値

マウスが正常にキャプチャされた場合は true。それ以外の場合は falsetrue if the mouse is successfully captured; otherwise, false.

実装

次の例では、マウスをキャプチャ (および uncapture) し、3D モデルを表示するための特殊なマウスモードを有効にする、マウスとキー入力の組み合わせに対するハンドラーのペアを実装します。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

注釈

キャプチャするには、要素を有効にする必要があります。To be captured, an element must be enabled. を呼び出すIsEnabled true 前に、がであるかどうかをCaptureMouse確認します。Check whether IsEnabled is true before you call CaptureMouse.

を呼びCaptureMouse出すtrueと、 IsMouseCapturedtrueになります。If calling CaptureMouse returns true, then IsMouseCaptured is also true.

を呼びCaptureMouse出すtrue GotMouseCaptureと、イベントとIsMouseCapturedChangedイベントが発生RoutedEventArgs.Sourceし、 CaptureMouseメソッドが呼び出された要素として報告されたイベントデータが返されます。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. キャプチャを強制的に実行すると、既存のキャプチャに干渉する可能性があります。特に、ドラッグアンドドロップに関連するキャプチャがマウスで発生する場合です。If you force capture, you might interfere with existing captures - especially with captures that relate to drag-and-drop with the mouse.

すべての要素からマウスキャプチャをクリアするMouse.Captureにはelement 、としnullて指定されたパラメーターを使用してを呼び出します。To clear mouse capture from all elements, call Mouse.Capture with the element parameter provided as null.

適用対象

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