/// <summary>
/// Expand
/// </summary>
public void Expand()
{
// 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 (this.Visible)
{
Items.ReadWriteLock.AcquireReaderLock(-1);
for (int i = Items.Count - 1; i >= 0; i--)
{
TreeListViewItem item = this.Items[i];
if (!item.Visible)
{
ListView LView = this.ListView;
LView.Items.Insert(
this.Index + 1,
item);
item.SetIndentation();
}
if (item.IsExpanded)
{
item.Expand();
}
}
Items.ReadWriteLock.ReleaseReaderLock();
}
// The item wasn't expanded -> raise an event
if (Visible && !_isexpanded && ListView != null)
{
this._isexpanded = true;
TreeListViewEventArgs e = new TreeListViewEventArgs(
this, TreeListViewAction.Expand);
ListView.RaiseAfterExpand(e);
if (AfterExpand != null)
{
AfterExpand(this);
}
}
this._isexpanded = true;
}
/// <summary>
/// Adds an item in the collection and in the TreeListView
/// </summary>
/// <param name="item"></param>
/// <returns>Index of the item in the collection</returns>
public virtual int Add(TreeListViewItem item)
{
int index = GetInsertCollectionIndex(item);
if (index == -1)
{
return(-1);
}
if (Parent != null)
{
item.SetParent(Parent);
}
item.Items.Comparer = this.Comparer;
ReadWriteLock.AcquireWriterLock(-1);
int treelistviewindex = GetInsertTreeListViewIndex(item);
// Insert in the ListView
if (treelistviewindex > -1)
{
ListView listview = (ListView)TreeListView;
InsertListViewItem insert = new InsertListViewItem(listview.Items.Insert);
if (listview.InvokeRequired)
{
listview.Invoke(insert, new object[] { treelistviewindex, (ListViewItem)item });
}
else
{
listview.Items.Insert(treelistviewindex, (ListViewItem)item);
}
if (item.IsExpanded)
{
item.Expand();
}
item.SetIndentation();
}
// Insert in this collection
if (index > -1)
{
List.Insert(index, item);
}
ReadWriteLock.ReleaseWriterLock();
return(index);
}
/// <summary>
/// WndProc
/// </summary>
/// <param name="m"></param>
protected override void WndProc(ref System.Windows.Forms.Message m)
{
TreeListViewItem item = null;
switch ((WM_MESSAGE)m.Msg)
{
// Disable this notification to remove the auto-check when
// the user double-click on an item
case WM_MESSAGE.WM_LBUTTONDBLCLK:
if (this.SelectedIndices.Count > 0)
{
item = this.SelectedItems[0];
bool doExpColl = false;
Rectangle rec;
switch (ExpandMethod)
{
case TreeListViewExpandMethod.IconDbleClick:
rec = item.GetBounds(ItemBoundsPortion.Icon);
if (rec.Contains(PointToClient(MousePosition)))
{
doExpColl = true;
}
break;
case TreeListViewExpandMethod.ItemOnlyDbleClick:
rec = item.GetBounds(ItemBoundsPortion.ItemOnly);
if (rec.Contains(PointToClient(MousePosition)))
{
doExpColl = true;
}
break;
case TreeListViewExpandMethod.EntireItemDbleClick:
rec = item.GetBounds(ItemBoundsPortion.Entire);
if (rec.Contains(PointToClient(MousePosition)))
{
doExpColl = true;
}
break;
default:
break;
}
if (doExpColl)
{
FindForm().Cursor = Cursors.WaitCursor;
BeginUpdate();
if (item.IsExpanded)
{
item.Collapse();
}
else
{
item.Expand();
}
EndUpdate();
FindForm().Cursor = Cursors.Default;
}
}
return;
case WM_MESSAGE.WM_KEYDOWN:
if (this.SelectedIndices.Count == 0)
{
break;
}
item = this.SelectedItems[0];
if (item == null)
{
break;
}
switch ((Keys)(int)m.WParam)
{
case Keys.Enter:
break;
case Keys.Left:
this.BeginUpdate();
if (item.IsExpanded)
{
item.Collapse();
}
else if (item.Parent != null)
{
item.Parent.Selected = true;
item.Parent.Focused = true;
}
this.EndUpdate();
break;
case Keys.Right:
if (item.Items.Count == 0)
{
break;
}
this.BeginUpdate();
if (!item.IsExpanded)
{
item.Expand();
}
else
{
item.Items[item.Items.Count - 1].Selected = true;
item.Items[item.Items.Count - 1].Focused = true;
}
this.EndUpdate();
break;
}
return;
}
base.WndProc(ref m);
}
