internal void CollapseInternal()
{
if (IsInATreeListView)
{
if (ListView.InvokeRequired)
{
throw new Exception("Invoke Required");
}
}
TreeListViewItem selItem = null;
if (TreeListView != null)
{
selItem = TreeListView.FocusedItem;
}
// The item was expanded -> raise an event
if (Visible && _IsExpanded && ListView != null)
{
TreeListViewCancelEventArgs e = new TreeListViewCancelEventArgs(this, TreeListViewAction.Collapse);
ListView.RaiseBeforeCollapse(e);
if (e.Cancel)
{
return;
}
}
// Collapse
if (this.Visible)
{
foreach (TreeListViewItem item in Items)
{
item.Hide();
}
}
// The item was expanded -> raise an event
if (Visible && _IsExpanded && IsInATreeListView)
{
this._IsExpanded = false;
TreeListViewEventArgs e = new TreeListViewEventArgs(this, TreeListViewAction.Collapse);
ListView.RaiseAfterCollapse(e);
if (AfterCollapse != null)
{
AfterCollapse(this);
}
}
this._IsExpanded = false;
if (IsInATreeListView && selItem != null)
{
if (selItem.Visible)
{
selItem.Focused = true;
}
else
{
ListView listview = (ListView)TreeListView;
listview.SelectedItems.Clear();
TreeListViewItem[] items = selItem.ParentsInHierarch;
for (int i = items.Length - 1; i >= 0; i--)
{
if (items[i].Visible)
{
items[i].Focused = true;
break;
}
}
}
}
}
internal void ExpandInternal()
{
if (IsInATreeListView)
{
if (ListView.InvokeRequired)
{
throw new Exception("Invoke Required");
}
}
TreeListViewItem selItem = null;
if (TreeListView != null)
{
selItem = TreeListView.FocusedItem;
}
// Must set ListView.checkDirection to CheckDirection.None.
// Forbid recursively checking.
CheckDirection oldDirection = CheckDirection.All;
if (ListView != null)
{
oldDirection = this.ListView.CheckDirection;
ListView.CheckDirection = CheckDirection.None;
}
// The item wasn't expanded -> raise an event
if (Visible && !_IsExpanded && ListView != null)
{
TreeListViewCancelEventArgs e = new TreeListViewCancelEventArgs(this, TreeListViewAction.Expand);
ListView.RaiseBeforeExpand(e);
if (e.Cancel)
{
return;
}
}
if (Visible)
{
for (int i = Items.Count - 1; i >= 0; i--)
{
TreeListViewItem item = this.Items[i];
if (!item.Visible)
{
ListView listView = this.ListView;
listView.Items.Insert(this.Index + 1, item);
item.SetIndentation();
}
if (item.IsExpanded)
{
item.Expand();
}
}
}
// The item wasn't expanded -> raise an event
if (Visible && !_IsExpanded && IsInATreeListView)
{
this._IsExpanded = true;
TreeListViewEventArgs e = new TreeListViewEventArgs(this, TreeListViewAction.Expand);
ListView.RaiseAfterExpand(e);
if (AfterExpand != null)
{
AfterExpand(this);
}
}
this._IsExpanded = true;
// Reset ListView.checkDirection
if (IsInATreeListView)
{
ListView.CheckDirection = oldDirection;
}
if (TreeListView != null && selItem != null)
{
if (selItem.Visible)
{
selItem.Focused = true;
}
}
}