Theme library
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What is Theme manager?
Theme manager has been originally created by Mike Lischke (see http://www.soft-gems.net/) to enable Windows XP theme painting in Borland Delphi and Borland C++ Builder applications.
Why do we need Theme manager?
It gives the ability to have ownerdraw controls with the same look and feel as native controls.
What ownerdraw controls do we have?
- TCustomSpeedButton descendants (TSpeedButton)
- TCustomSplitter descendants (TSplitter)
- TCustomGrid descendants (TStringGrid, TDBGrid)
- TCustomUpDown descendants (TUpDown)
- ...
What is the current state of implementation?
Windows XP and Vista applications with manifest - fully implemented since theme manager originally created for Windows XP.
Element | default | gtk | gtk2 | carbon | qt | Used in components |
---|---|---|---|---|---|---|
teButton | Partially Implemented | Partially Implemented | Partially Implemented | Partially Implemented | Partially Implemented | TSpeedButton |
teHeader | Partially Implemented | Partially Implemented | Partially Implemented | Not Implemented | Partially Implemented | TCustomGrid |
teRebar | Partially Implemented | Partially Implemented | Partially Implemented | Partially Implemented | Not Implemented | TSplitter |
teToolBar | Partially Implemented | Partially Implemented | Partially Implemented | Partially Implemented | Partially Implemented | TSpeedButton |
How to use ThemeServices class for painting?
It is rather simple. Let's do an empty form and paint a push button on it with normal state.
unit Unit1;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, LResources, Forms, Controls, Graphics;
type
TForm1 = class(TForm)
private
{ private declarations }
public
procedure Paint; override;
end;
var
Form1: TForm1;
implementation
{$R manifest.res}
uses
LCLType, Themes;
procedure TForm1.Paint;
var
Details: TThemedElementDetails;
PaintRect: TRect;
begin
inherited Paint;
PaintRect := Rect(10, 10, 80, 50);
Details := ThemeServices.GetElementDetails(tbPushButtonNormal);
ThemeServices.DrawElement(Canvas.Handle, Details, PaintRect, nil);
PaintRect := ThemeServices.ContentRect(Canvas.Handle, Details, PaintRect);
ThemeServices.DrawText(Canvas, Details, 'Test caption', PaintRect,
DT_CENTER or DT_VCENTER or DT_SINGLELINE, 0);
end;
initialization
{$I unit1.lrs}
end.
And the result will look so:
--Paul Ishenin 20:31, 9 June 2007 (CEST)