/// <summary>
/// Method is executed if a shape is dragged across the canvas.
/// </summary>
/// <param name="position"></param>
/// <param name="delta"></param>
void ICanvasViewMouseHandler.OnShapeDragUpdate(Point position, Vector delta)
{
if (this.mPart_ItemsControl == null)
{
return;
}
foreach (ShapeViewModelBase shape in CanvasViewModel.SelectedItem.Shapes)
{
FrameworkElement control = this.ControlFromElement(shape);
if ((bool)control.GetValue(CanvasView.CustomDragProperty))
{
continue;
}
// Get current position of shape
Point origin = shape.Position;
// Move shape by this delta in X and Y
Point p = origin + delta;
// Check whether the new position is legal and optimize based on the canvas view size
if (p.X < 0)
{
p.X = 0;
}
else
{
if (p.X + control.ActualWidth > this.mPart_ItemsControl.ActualWidth)
{
p.X = this.mPart_ItemsControl.ActualWidth - control.ActualWidth;
}
}
if (p.Y < 0)
{
p.Y = 0;
}
else
{
if (p.Y + control.ActualHeight > this.mPart_ItemsControl.ActualHeight)
{
p.Y = this.mPart_ItemsControl.ActualHeight - control.ActualHeight;
}
}
// Set shape to new position
shape.Position = p;
// Invoke snap event if possible to let lines adjust correctly
if (control is ISnapTarget)
{
ISnapTarget ist = control as ISnapTarget;
ist.NotifySnapTargetUpdate(new SnapTargetUpdateEventArgs(p - origin));
}
}
}
/// <summary>
/// Occurs when the SnapTargetUpdate event occurs
/// in the ISnapTarget dependency property.
/// </summary>
/// <param name="source"></param>
/// <param name="e"></param>
private void snapTargetUpdate(ISnapTarget source, SnapTargetUpdateEventArgs e)
{
if (e.IsMoveUpdate == MoveUpdate.MoveDelta)
{
this.MoveTo(new Point(this.Left, this.Top) + e.MoveDelta);
}
else
{
this.CoerceLater();
}
}
private void snapTargetUpdate(ISnapTarget source, SnapTargetUpdateEventArgs e)
{
if (e.isMoveUpdate)
{
MoveTo(new Point(Left, Top) + e.moveDelta);
}
else
{
CoerceLater();
}
}
void ICanvasViewMouseHandler.OnShapeDragUpdate(Point position, Vector delta)
{
foreach (XElement shape in _CanvasViewModel.prop_SelectedShapes)
{
FrameworkElement control = ControlFromElement(shape);
if ((bool)control.GetValue(CanvasView.CustomDragProperty))
{
continue;
}
Point origin = shape.GetPositionAttributes();
Point p = origin + delta;
if (p.X < 0)
{
p.X = 0;
}
else if (p.X + control.ActualWidth > _itemsControl.ActualWidth)
{
p.X = _itemsControl.ActualWidth - control.ActualWidth;
}
if (p.Y < 0)
{
p.Y = 0;
}
else if (p.Y + control.ActualHeight > _itemsControl.ActualHeight)
{
p.Y = _itemsControl.ActualHeight - control.ActualHeight;
}
shape.SetPositionAttributes(p);
ISnapTarget ist = control as ISnapTarget;
if (ist != null)
{
ist.NotifySnapTargetUpdate(new SnapTargetUpdateEventArgs(p - origin));
}
}
}
private void snapTargetUpdate(ISnapTarget source, SnapTargetUpdateEventArgs e)
{
NotifySnapTargetUpdate(e);
}