UIElement.ReleaseMouseCapture Method
Definition
Important
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Releases the mouse capture, if this element held the capture.
public:
virtual void ReleaseMouseCapture();
public void ReleaseMouseCapture ();
abstract member ReleaseMouseCapture : unit -> unit
override this.ReleaseMouseCapture : unit -> unit
Public Sub ReleaseMouseCapture ()
Implements
Examples
The following example is the parallel to the example given for CaptureMouse: it handles mouse button up to release mouse capture and re-enable moving the mouse.
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
Remarks
If this element did not hold the capture, calling this method has no effect. Consider checking the value of IsMouseCaptured before you call this method.
Applies to
See also
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