private void CollapseInternal(bool byInternal)
{
if (!is_expanded || nodes.Count < 1)
{
return;
}
if (IsRoot)
{
return;
}
bool cancel = false;
TreeView tree_view = TreeView;
if (tree_view != null)
{
TreeViewCancelEventArgs e = new TreeViewCancelEventArgs(this, false, TreeViewAction.Collapse);
tree_view.OnBeforeCollapse(e);
cancel = e.Cancel;
}
if (!cancel)
{
int count_to_next = CountToNext();
is_expanded = false;
if (tree_view != null)
{
tree_view.OnAfterCollapse(new TreeViewEventArgs(this));
bool hbar_visible = tree_view.hbar.Visible;
bool vbar_visible = tree_view.vbar.Visible;
tree_view.RecalculateVisibleOrder(this);
tree_view.UpdateScrollBars(false);
// CollapseBelow if we affect the visible area
if (visible_order < tree_view.skipped_nodes + tree_view.VisibleCount + 1 && ArePreviousNodesExpanded)
{
tree_view.CollapseBelow(this, count_to_next);
}
if (!byInternal && HasFocusInChildren())
{
tree_view.SelectedNode = this;
}
// If one or both of our scrollbars disappeared,
// invalidate everything
if ((hbar_visible & !tree_view.hbar.Visible) || (vbar_visible & !tree_view.vbar.Visible))
{
tree_view.Invalidate();
}
}
}
}
// Collapse the children recursively but don't redraw.
private void CollapseInternal()
{
bool selected = false;
// Recursively collapse, if a child was selected, mark to select the parent.
if (childCount > 0)
{
for (int i = 0; i < childCount; i++)
{
if (null != treeView)
{
if (treeView.SelectedNode == children[i])
{
selected = true;
}
}
children[i].CollapseInternal();
}
}
if (expanded)
{
// Do the events.
TreeViewCancelEventArgs eventArgs = new TreeViewCancelEventArgs(this, false, TreeViewAction.Collapse);
if (null != treeView)
{
treeView.OnBeforeCollapse(eventArgs);
}
if (!eventArgs.Cancel)
{
// The node is now collapsed.
expanded = false;
if (null != treeView)
{
treeView.OnAfterCollapse(new TreeViewEventArgs(this));
}
}
}
if (selected)
{
if (null != treeView)
{
treeView.SelectedNode = this;
}
}
}
/// <include file='doc\TreeNode.uex' path='docs/doc[@for="TreeNode.DoCollapse"]/*' />
/// <devdoc>
/// Windows TreeView doesn't send the proper notifications on collapse, so we do it manually.
/// </devdoc>
private void DoCollapse(TreeView tv) {
if ((State & NativeMethods.TVIS_EXPANDED) != 0) {
TreeViewCancelEventArgs e = new TreeViewCancelEventArgs(this, false, TreeViewAction.Collapse);
tv.OnBeforeCollapse(e);
if (!e.Cancel) {
UnsafeNativeMethods.SendMessage(new HandleRef(tv, tv.Handle), NativeMethods.TVM_EXPAND, NativeMethods.TVE_COLLAPSE, Handle);
tv.OnAfterCollapse(new TreeViewEventArgs(this));
}
}
}