internal void RaiseBeforeCollapse(TreeListViewCancelEventArgs e)
{
if (BeforeCollapse != null)
{
BeforeCollapse(this, e);
}
}
internal void RaiseBeforeExpand(TreeListViewCancelEventArgs e)
{
if (BeforeExpand != null)
{
BeforeExpand(this, e);
}
}
/// <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>
/// Collapse
/// </summary>
public void Collapse()
{
// 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
Items.ReadWriteLock.AcquireReaderLock(-1);
if (this.Visible)
{
foreach (TreeListViewItem item in Items)
{
item.Hide();
}
}
Items.ReadWriteLock.ReleaseReaderLock();
// The item was expanded -> raise an event
if (Visible && _isexpanded && ListView != null)
{
this._isexpanded = false;
TreeListViewEventArgs e = new TreeListViewEventArgs(
this, TreeListViewAction.Collapse);
ListView.RaiseAfterCollapse(e);
if (AfterCollapse != null)
{
AfterCollapse(this);
}
}
this._isexpanded = false;
}