UIElement.CaptureMouse Méthode

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

Boolean

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

Implémente

Exemples

L’exemple suivant implémente une paire de gestionnaires pour la souris et la combinaison d’entrée de clé qui capturent (et décapturent) la souris et activent un mode de souris spécial 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 capturés, 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 à CaptureMouse retourne true , IsMouseCaptured est également true .If calling CaptureMouse returns true, then IsMouseCaptured is also true.

Si l' CaptureMouse appel true de retourne, GotMouseCapture les IsMouseCapturedChanged événements et sont déclenchés, avec RoutedEventArgs.Source dans les données d’événement signalées comme 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 risquez d’interférer avec les captures existantes, en particulier avec les captures qui se rapportent au 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 de tous les éléments, appelez Mouse.Capture avec le element paramètre fourni sous la forme null .To clear mouse capture from all elements, call Mouse.Capture with the element parameter provided as null.

S’applique à

Voir aussi