UIElement.CaptureMouse Metodo

Definizione

Tenta di forzare l’acquisizione del mouse in questo elemento.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

Restituisce

true se il mouse viene acquisito correttamente; in caso contrario, false.true if the mouse is successfully captured; otherwise, false.

Implementazioni

Esempi

Nell'esempio seguente viene implementata una coppia di gestori per la combinazione di input del mouse e chiave che acquisisce (e non acquisisce) il mouse e Abilita una modalità speciale del mouse per la visualizzazione di un modello 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

Commenti

Per l'acquisizione, è necessario abilitare un elemento.To be captured, an element must be enabled. Prima di chiamare CaptureMouse, controllare se IsEnabled è true.Check whether IsEnabled is true before you call CaptureMouse.

Se la chiamata di CaptureMouse restituisce true, viene trueanche IsMouseCaptured.If calling CaptureMouse returns true, then IsMouseCaptured is also true.

Se la chiamata di CaptureMouse restituisce true, vengono generati gli eventi GotMouseCapture e IsMouseCapturedChanged, con RoutedEventArgs.Source nei dati degli eventi segnalati come elemento in cui viene chiamato il metodo CaptureMouse.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. Se si impone l'acquisizione, è possibile interferire con le acquisizioni esistenti, soprattutto con le acquisizioni correlate al trascinamento della selezione con il mouse.If you force capture, you might interfere with existing captures - especially with captures that relate to drag-and-drop with the mouse.

Per cancellare il mouse capture da tutti gli elementi, chiamare Mouse.Capture con il parametro element fornito come null.To clear mouse capture from all elements, call Mouse.Capture with the element parameter provided as null.

Si applica a

Vedi anche