TdxTreeViewGetImageIndexEvent Type
The image index retrieval procedural type for tree nodes.
Declaration
TdxTreeViewGetImageIndexEvent = procedure(Sender: TdxCustomTreeView; ANode: TdxTreeViewNode; var AImageIndex: Integer) of object;
Parameters
Name | Type | Description |
---|---|---|
Sender | TdxCustomTreeView | The Tree View control that raised an image index retrieval event. |
ANode | TdxTreeViewNode | The target tree node. |
AImageIndex | Integer | An index of the image displayed in the target tree node. |
Remarks
The following OnGetImageIndex event handler assigns images with the indexes 1 and 2 to expanded and collapsed nodes, respectively.
procedure TForm1.dxTreeViewControl1GetImageIndex(Sender: TdxCustomTreeView;
ANode: TdxTreeViewNode; var AImageIndex: Integer);
begin
if ANode.HasChildren then
if ANode.Expanded then
ANode.ImageIndex := 1
else
ANode.ImageIndex := 2;
end;
Note
A tree node’s ExpandedImageIndex allows you to do the same without an OnGetImageIndex event handler.
The Tree View’s OnGetImageIndex and OnGetSelectedImageIndex events reference the TdxTreeViewGetImageIndexEvent type.
See Also