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)); } } }