TdxTreeViewCustomDrawNodeEvent Type

The custom draw procedural type for tree nodes.

Declaration

TdxTreeViewCustomDrawNodeEvent = procedure(Sender: TdxCustomTreeView; ACanvas: TcxCanvas; ANodeViewInfo: TdxTreeViewNodeViewInfo; var AHandled: Boolean) of object;

Parameters

Name	Type	Description
Sender	TdxCustomTreeView	The Tree View control that raised a custom draw event for a node.
ACanvas	TcxCanvas	The Sender Tree View control’s canvas.
ANodeViewInfo	TdxTreeViewNodeViewInfo	ViewInfo information on the drawn tree node.
AHandled	Boolean	Assign True to this property to override the built-in node draw routine. Do not change this parameter value if you only need to add custom draw operations to the built-in routine.

Remarks

The following OnCustomDrawNode event handler applies the italic font attribute to a selected node’s caption:

Delphi

procedure TForm1.dxTreeViewControl1CustomDrawNode(Sender: TdxCustomTreeView;
  ACanvas: TcxCanvas; ANodeViewInfo: TdxTreeViewNodeViewInfo;
  var AHandled: Boolean);
begin
  if ANodeViewInfo.Node.Selected then
    ACanvas.Font.Style := ACanvas.Font.Style + [fsItalic];
end;

C++

void __fastcall TForm1::dxTreeViewControl1CustomDrawNode(TdxCustomTreeView *Sender,
  TcxCanvas *ACanvas, TdxTreeViewNodeViewInfo *ANodeViewInfo, bool &AHandled)
{
  if (ANodeViewInfo->Node->Selected)
    ACanvas->Font->Style = ACanvas->Font->Style << fsItalic;
}

The Tree View’s OnCustomDrawNode event references the TdxTreeViewCustomDrawNodeEvent type.