TdxTreeViewCustomDrawEvent Type

The custom draw procedural type for the Tree View control.

Declaration

TdxTreeViewCustomDrawEvent = procedure(Sender: TdxCustomTreeView; ACanvas: TcxCanvas; AViewInfo: TdxTreeViewViewInfo; var AHandled: Boolean) of object;

Parameters

Name	Type	Description
Sender	TdxCustomTreeView	The Tree View control that raised a custom draw event.
ACanvas	TcxCanvas	The Sender Tree View control’s canvas.
AViewInfo	TdxTreeViewViewInfo	The Tree View control’s ViewInfo information.
AHandled	Boolean	Assign True to this parameter if you override the Tree View control’s built-in draw routine. Do not change the parameter value if you only need to complement the built-in draw routine with custom draw operations.

Remarks

The following OnCustomDraw event handler changes the default background color of the Tree View to blue:

Delphi

procedure TForm1.dxTreeViewControl1CustomDraw(Sender: TdxCustomTreeView;
  ACanvas: TcxCanvas; AViewInfo: TdxTreeViewViewInfo; var AHandled: Boolean);
begin
  ACanvas.Brush.Color := clSkyBlue;
  ACanvas.FillRect(AViewInfo.Bounds);
end;

C++

void __fastcall TForm1::dxTreeViewControl1CustomDraw(TdxCustomTreeView *Sender,
  TcxCanvas *ACanvas, TdxTreeViewViewInfo *AViewInfo, bool &AHandled)
{
  ACanvas->Brush->Color = clSkyBlue;
  ACanvas->FillRect(AViewInfo->Bounds);
}

The Tree View’s OnCustomDraw event references the TdxTreeViewCustomDrawEvent type.