TdxTabbedMDIManager.ViewInfo Property

Provides access to ViewInfo information about the tabbed control that arranges MDI child forms within the tabbed MDI manager.

Declaration

property ViewInfo: TdxTabbedMDITabControlViewInfo read;

Property Value

Type
TdxTabbedMDITabControlViewInfo

Remarks

Use the ViewInfo information to access the settings of UI elements displayed in the MDI manager’s tabbed control. For instance, you can use this information when implementing your own drag-and-drop logic.

The following code snippet shows a form’s OnDragOver event handler which uses the ViewInfo information to determine the tabbed page located under the mouse pointer.

procedure <Form>.FormDragOver(Sender, Source: TObject; X, Y: Integer; State: TDragState; var Accept: Boolean);
var
  APoint: TPoint;
  APageIndex: Integer;
begin
  Accept := False;
  if dxTabbedMDIManager1.Active then
  begin
    APoint := cxPointOffset(Point(X, Y), dxTabbedMDIManager1.ViewInfo.BoundsRect.TopLeft, False);
    APageIndex := dxTabbedMDIManager1.ViewInfo.VisibleIndexOfTabAt(APoint.X, APoint.Y);
    if APageIndex <> -1 then
    begin
      dxTabbedMDIManager1.TabProperties.PageIndex := APageIndex;
      Accept := True;
    end;
  end;
end;

Refer to the solution published at https://supportcenter.devexpress.com/ticket/details/q226932/add-the-capability-to-activate-a-tab-when-dragging-an-object-over-it-during-form-to-form for the complete code example.