/// <summary>
/// Destroy the current rubberband viewmodel to make way
/// for a new rubber band selection based on a new viewmodel and view.
/// </summary>
public void ResetRubberBand()
{
if (_RubberBand != null)
{
_RubberBand = null;
}
}
/// <summary>
/// Is called if the user begins a drag operation on the canvas and there is no other
/// mouse handler (eg, AssociationMouseHandler) currently activated.
///
/// Otherwise, the OnShapeDragBegin method of the other mouse handler is executed and
/// this method is completely ignorred for the current drag operation.
/// </summary>
/// <param name="position"></param>
/// <param name="shape"></param>
void ICanvasViewMouseHandler.OnShapeDragBegin(Point position, ShapeViewModelBase shape)
{
if (shape != null)
{
// Activate shape selection if user starts to drag a shape
if (shape.IsSelected == false)
{
((ICanvasViewMouseHandler)this).OnShapeClick(this.mDragShape);
}
}
else // user starts a drag operation on the canvas so we setup a rubber band adorner command
{ // to implement multi object selection via rubber band
if (this.mCurrentMouseHandler == this)
{
// Clear current selection if no control key is pressed on the keyboard (which would allow adding selected items)
if ((Keyboard.IsKeyDown(Key.LeftCtrl) == false &&
Keyboard.IsKeyDown(Key.RightCtrl) == false))
{
CanvasViewModel.SelectedItem.SelectShape(null);
}
RubberBandViewModel vm = this.GetRubberBand(position);
// Create a new mouse handler command, attach event on completion, and hook it into the system
CreateRubberBandMouseHandler handler = new CreateRubberBandMouseHandler(vm, this.CanvasViewModel);
handler.RubberBandSelection += handler_RubberBandSelection;
// Hook up into frame work system
this.CanvasViewModel.BeginCanvasViewMouseHandler(handler);
this.BeginMouseOperation();
//this.mCurrentMouseHandler = this.CanvasViewModel.CanvasViewMouseHandler;
}
}
}
/// <summary>
/// Destroy the current rubberband viewmodel to make way
/// for a new rubber band selection based on a new viewmodel and view.
/// </summary>
public void ResetRubberBand()
{
if (this.mRubberBand != null)
{
this.mRubberBand = null;
}
}
/// <summary>
/// Create a new rubber band adorner along with its viewmodel in this canvas viewmodel.
/// </summary>
/// <param name="position"></param>
/// <returns></returns>
private RubberBandViewModel GetRubberBand(Point position)
{
this.DestroyRubberband();
RubberBandViewModel rbViewModel = this.CanvasViewModel.RubberBand;
rbViewModel.IsVisible = false;
rbViewModel.Position = new Point(position.X, position.Y);
rbViewModel.EndPosition = new Point(position.X, position.Y);
if (this.mRubberbandAdorner == null)
{
this.mRubberbandAdorner = new RubberbandAdorner(this, new Point(position.X, position.Y));
this.mRubberbandAdorner.Visibility = System.Windows.Visibility.Hidden;
this.mRubberbandAdorner.Width = this.mRubberbandAdorner.Height = 0;
// EndPosition binding with converter
{
var endPosBinding = new Binding("EndPosition");
endPosBinding.Source = rbViewModel;
BindingOperations.SetBinding(this.mRubberbandAdorner, RubberbandAdorner.EndPointProperty, endPosBinding);
}
// Visibility binding with converter
{
var visiblityBinding = new Binding("IsVisible");
visiblityBinding.Source = rbViewModel;
visiblityBinding.Converter = CanvasView.mBoolToVisConverter;
BindingOperations.SetBinding(this.mRubberbandAdorner, RubberbandAdorner.VisibilityProperty, visiblityBinding);
}
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);
if (adornerLayer != null)
{
adornerLayer.Add(this.mRubberbandAdorner);
}
}
rbViewModel.IsVisible = true;
return(rbViewModel);
}
