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

Définition

Essaie de forcer la capture de la souris par cet élément.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

Retours

true si la souris est capturée correctement ; sinon, false.true if the mouse is successfully captured; otherwise, false.

Implémente

Exemples

L’exemple suivant implémente deux gestionnaires de souris et les touches d’entrée qui capture (et annuler la capture) de la souris et activer un mode spécial de la souris pour l’affichage d’un modèle 3D.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

Remarques

Pour être capturé, un élément doit être activé.To be captured, an element must be enabled. Vérifiez si IsEnabled est true avant d’appeler CaptureMouse.Check whether IsEnabled is true before you call CaptureMouse.

Si l’appel CaptureMouse retourne true, puis IsMouseCaptured est également true.If calling CaptureMouse returns true, then IsMouseCaptured is also true.

Si l’appel CaptureMouse retourne true, puis le GotMouseCapture et IsMouseCapturedChanged événements sont déclenchés, avec RoutedEventArgs.Source de l’événement signalé de données en tant que l’élément où la CaptureMouse méthode est appelée.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. Si vous forcez la capture, vous pouvez interférer avec les captures - en particulier avec des captures qui se rapportent à glisser-déplacer avec la souris.If you force capture, you might interfere with existing captures - especially with captures that relate to drag-and-drop with the mouse.

Pour effacer la capture de la souris à partir de tous les éléments, appelez Mouse.Capture avec la element paramètre fourni en tant que null.To clear mouse capture from all elements, call Mouse.Capture with the element parameter provided as null.

S’applique à

Voir aussi