/// <summary>
/// Handle mouse down
/// </summary>
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
m_lastLocation = e.Location;
SetTransformedLocation(e.Location);
m_originalLocation = m_transformed_location;
if (e.Button == MouseButtons.Left)
{
IElement clickedElement = FindElementAt(Point.Round(m_transformed_location), true);
if (clickedElement != null)
{
clickedElement.As <IMouseDownHandler>()?.OnMouseDown(e);
if (clickedElement.CanBeSelected && !clickedElement.Selected)
{
Selection.UnselectAll();
Selection.AddElement(clickedElement);
BringElementToFront(clickedElement);
}
m_dragElement = true;
}
else
{
m_dragElement = false;
}
SelectedElement = clickedElement;
if (SelectedElement != null)
{
SelectedElement.Selected = true;
}
}
}