TdxCustomTileControl.OnGroupDragBegin Event

Enables you to forbid end-users to drag-and-drop specific tile groups within the control.

Declaration

delphi

property OnGroupDragBegin: TdxTileControlGroupDragBeginEvent read; write;

Remarks

This event occurs every time an end-user starts dragging a tile group. You can assign False to the AAllow parameter within the OnGroupDragBegin event handler to prevent an end-user from dragging all or only specific groups within the control. For instance, you can allow end-users to drag only the top or leftmost group, depending on the OptionsView.GroupLayout property value:

Delphi
C++

delphi

procedure TMyForm.dxTileControl1GroupDragBegin(Sender: TdxCustomTileControl; AInfo: TdxTileControlDragGroupInfo; var AAllow: Boolean);
begin
  if AInfo.BeginIndex <> 0 then // If the dragged group is not the first...
    AAllow := False; // Forbids an end-user to drop a group here
end;

cpp

void __fastcall TMyForm::dxTileControl1GroupDragOver(TdxCustomTileControl *Sender, TdxTileControlDragGroupInfo *AInfo, bool &AAccept)
{
  if(AInfo->BeginIndex != 0) { // If the dragged group is not the first...
    AAllow = False; // Forbids an end-user to drop a group here
  }
}

Refer to the TdxTileControlGroupDragBeginEvent procedural type description for detailed information on all parameters accessible within an OnGroupDragBegin event handler.