/// <summary>
/// The marquee rectangle is upon to be dragged.
/// </summary>
private void OnDragStarting(object sender, MarqueeSelectionEventArgs e)
{
var hitGroupNode = GetHitGroupNode(e.Context, e.Context.CanvasControl.LastEventLocation);
layoutHelper = new ClearAreaLayoutHelper(graphControl)
{
ClearRectangle = e.Rectangle,
GroupNode = hitGroupNode
};
layoutHelper.InitializeLayout();
}
/// <summary>
/// Dragging the marquee rectangle has been finished so
/// we execute the layout with the final rectangle.
/// </summary>
private void OnDragFinished(object sender, MarqueeSelectionEventArgs e)
{
layoutHelper.ClearRectangle = e.Rectangle;
layoutHelper.StopLayout();
}
/// <summary>
/// Dragging the marquee rectangle has been canceled so
/// the state before the gesture must be restored.
/// </summary>
private void OnDragCanceled(object sender, MarqueeSelectionEventArgs e)
{
layoutHelper.ClearRectangle = e.Rectangle;
layoutHelper.CancelLayout();
}
