public override bool Merge(CommandItem newitem)
{
SelectionMovedOrResizedCI newitemx = newitem as SelectionMovedOrResizedCI;
// Ensure items are of the same type.
if (newitemx == null ||
newitemx._editingOperationCount != _editingOperationCount ||
!StrokeCollectionsAreEqual(newitemx._selection, _selection))
{
return(false);
}
// Keep former oldrect, latter newrect.
_newrect = newitemx._newrect;
return(true);
}
/// <summary>
/// Enabling undo/redo for selections moving or resizing.
/// </summary>
void MyInkCanvas_SelectionMovingOrResizing(object sender, InkCanvasSelectionEditingEventArgs e)
{
// Enforce stroke bounds to positive territory.
Rect newRect = e.NewRectangle; Rect oldRect = e.OldRectangle;
if (newRect.Top < 0d || newRect.Left < 0d)
{
Rect newRect2 =
new Rect(newRect.Left < 0d ? 0d : newRect.Left,
newRect.Top < 0d ? 0d : newRect.Top,
newRect.Width,
newRect.Height);
e.NewRectangle = newRect2;
}
CommandItem item = new SelectionMovedOrResizedCI(_cmdStack, MyInkCanvas.GetSelectedStrokes(), newRect, oldRect, _editingOperationCount);
_cmdStack.Enqueue(item);
}