From Lazarus wiki
Jump to: navigation, search

Deutsch (de) | English (en)


ATTabs is a tab-control component for Delphi and Lazarus. It's not replacement for standard tab control, but is alternative one, it has different API. It paints tabs OS-indenendant, using custom drawing on canvas.


ATTabs demo.png

Author: Alexey Torgashin

How to use it like TPageControl

Make some new panel, which will be like TPageControl. Place ATTabs on it, make Align=alTop. Now you create several Forms or Frames onto this panel (they have Parent:=Panel1). How to switch these frames on changing tabs?

1) Add tabs OnChange event handler. 2) In this event handler make a) hiding all frames, b) showing frame, which is assigned to current TabIndex.

When you create a new tab, you can set its TabObject property. Set TabObject to a frame. When OnChage occurs, get TabIndex, call GetTabData for this index, and read TabObject for this tab. Show frame, which is stored in this TabObject, hide all others.

    d: TATTabData;
    d:= t.GetTabData(t.TabIndex);
    if Assigned(d) then
      (d.TabObject as TMyFrame).Show;


License: MPL 2.0. Also if your project needs it, you can use it under LGPL.


Latest version, with demo app, is always at

  • Download the zip file from Github using "Download zip" button.
  • No installation into Lazarus needed, just unpack file ATTabs.pas to any folder.


Lazarus: 1.2.0+

Tested on: Win32 (Windows 7), Linux GTK2 or QT (Ubuntu 14.04), macOS (10.8).


Component doesn't support Lazarus designer, you need to create TATTabs objects at runtime. See API documentation at "Wiki" page of Github page.