ATListbox

About

ATListbox is OS-independant listbox control. It's made for dialog like Sublime Text's command list. Fully owner-drawn: you must not set captions, but must add OnDrawItem event, and set ItemCount, ItemIndex.

Author: Alexey Torgashin.

Screenshot:

Download

Homepage at github: https://github.com/Alexey-T/ATButtons

License

MPL 2.0 or LGPL.

Requirements

Lazarus: 1.4.0.

Tested on: Linux gtk2 (Ubuntu 14.04), Win32 (Win7), QT.

Properties

• ItemCount
• ItemIndex (index of active item)
• ItemTop (index of item visible at the top)
• ItemHeight (height in pixels of each item)
• VisibleItems (count of items fully visible inside control)
• OnDrawItem
• OnClick

Example

Let's create list:

var
  b: TATListbox;

procedure TfmMain.FormCreate(Sender: TObject);
begin
  b:= TATListbox.Create(Self);
  b.Parent:= Self;
  b.Align:= alClient;

  b.OnDrawItem:= @ListDraw;
  b.OnClick:= @ListClick;

  b.Color:= $e0e0e0;
  b.ItemCount:= 21;
end;

Let's set OnDrawItem to this (simply paint "itemNN"):

procedure TfmMain.ListDraw(Sender: TObject; C: TCanvas; AIndex: integer;
  const ARect: TRect);
begin
  C.Brush.Color:= IfThen(AIndex=b.ItemIndex, clMedGray, b.Color);
  C.FillRect(ARect);

  C.Pen.Color:= clMedGray;
  C.Line(ARect.Left+2, ARect.Bottom-1, ARect.Right-2, ARect.Bottom-1);

  C.TextOut(ARect.Left+6, ARect.Top+2, 'item '+inttostr(AIndex));
end;

Then need to add OnKeyDown event to form, which handles Up/Down/Home/End keys: just change "b.ItemIndex". Example of this event is in demo.