/// <summary>
/// Determines whether the +/- button is clicked and expands or
/// collapses the tree branch that starts from the node if so ...
/// </summary>
/// <param name="point">The document coordinates of the mouse pointer.</param>
/// <returns>true if the expand/collapse button has been clicked.</returns>
internal override bool hitTest(PointF point)
{
RectangleF bounds = item.getRotatedBounds();
RectangleF iconRect = getIconRect(bounds);
if (Utilities.pointInRect(point, iconRect))
{
FlowChart fc = item.flowChart;
Node node = item as Node;
if (fc.ExpandButtonAction == ExpandButtonAction.ExpandTreeBranch)
{
fc.UndoManager.onStartExpand();
if (node.Expanded)
{
// collapse the tree branch groiwng from this node
node.collapse();
fc.fireTreeCollapsed(node);
}
else
{
// expand the tree branch groiwng from this node
node.expand();
fc.fireTreeExpanded(node);
}
fc.UndoManager.onEndExpand();
}
if (fc.ExpandButtonAction == ExpandButtonAction.RaiseEvents)
{
node.SetExpandedFlag(!node.isExpanded());
fc.raiseExpandBtnClicked(node);
}
return(true);
}
return(false);
}