/// <summary>
/// Toggles the expanded/collapsed state of the specified tree item.
/// This will raise the EventSubtreeExpanded or EventSubtreeCollapsed
/// events based on the current item's state.
/// </summary>
/// <param name="item"></param>
public void ToggleSubtree(TreeViewItemRenderingState item)
{
if (d_itemModel == null)
{
return;
}
item.d_subtreeIsExpanded = !item.d_subtreeIsExpanded;
var args = new ItemViewEventArgs(this, d_itemModel.MakeIndex(item.d_childId, item.d_parentIndex));
if (item.d_subtreeIsExpanded)
{
ComputeRenderedChildrenForItem(item, d_itemModel.MakeIndex(item.d_childId, item.d_parentIndex), ref d_renderedMaxWidth, ref d_renderedTotalHeight);
OnSubtreeExpanded(args);
}
else
{
ClearItemRenderedChildren(item, ref d_renderedTotalHeight);
OnSubtreeCollapsed(args);
}
UpdateScrollbars();
// we need just a simple invalidation. No need to redo the render state
// as we modified it ourself directly.
Invalidate(false);
}
protected virtual void OnSelectionChanged(ItemViewEventArgs args)
{
InvalidateView(false);
FireEvent(EventSelectionChanged, args);
}
protected virtual void OnSubtreeCollapsed(ItemViewEventArgs args)
{
FireEvent(EventSubtreeCollapsed, args, EventNamespace);
}
