private void treeListView1_BeforeCollapse(object sender, System.Windows.Forms.TreeListViewCancelEventArgs e)
{
if (e.Item.ImageIndex == 2)
{
e.Item.ImageIndex = 1;
}
}
private void treeListView1_BeforeExpand(object sender, System.Windows.Forms.TreeListViewCancelEventArgs e)
{
if (e.Item.ImageIndex == 1)
{
e.Item.ImageIndex = 2;
}
}
/// <summary>
/// Raises the BeforeExpand event.
/// </summary>
/// <param name="e"></param>
protected virtual void OnBeforeExpand(TreeListViewCancelEventArgs e)
{
if(BeforeExpand != null) BeforeExpand(this, e);
}
/// <summary>
/// Raises the BeforeCollapse event.
/// </summary>
/// <param name="e"></param>
protected virtual void OnBeforeCollapse(TreeListViewCancelEventArgs e)
{
if(BeforeCollapse != null) BeforeCollapse(this, e);
}
internal void RaiseBeforeExpand(TreeListViewCancelEventArgs e)
{
OnBeforeExpand(e);
}
internal void RaiseBeforeCollapse(TreeListViewCancelEventArgs e)
{
OnBeforeCollapse(e);
}
/// <summary>
/// expand all nodes from this item to the top
/// </summary>
/// <param name="TLVI"></param>
public void Expand(TreeListViewItem TLVI)
{
BeginUpdate();
SelectedItems.Clear();
TLVI.Selected = true;
while (TLVI != null)
{
TreeListViewCancelEventArgs e = new TreeListViewCancelEventArgs(
TLVI, TreeListViewAction.Expand);
RaiseBeforeExpand(e);
TLVI = TLVI.Parent;
}
EndUpdate();
}
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 = 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 LView = this.ListView;
LView.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;
}
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;
}
}
}
}
void FSExplorer_BeforeCollapse(object sender, TreeListViewCancelEventArgs e)
{
if (e.Item.Level > 0)
{
if (e.Item.ImageKey == "文件夹展开")
{
e.Item.ImageKey = "文件夹收起";
}
}
}
void FSExplorer_BeforeExpand(object sender, TreeListViewCancelEventArgs e)
{
if (e.Item.Level > 0)
{
if (e.Item.ImageKey == "文件夹收起")
{
Shell32.SHFILEINFO shFolderInfo = new Shell32.SHFILEINFO();
Apq.Windows.Forms.IconChache.GetFileSystemIcon(e.Item.FullPath, ref shFolderInfo, true);
e.Item.ImageKey = "文件夹展开";
}
}
}