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Palettes in graphic controls

Posted on 1998-11-18
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Last Modified: 2010-04-04
I want to use more than the standard palette in graphic controls more precise I want them to be 16bit. Is that possible. I guess you can set the palette if you want 256 colours but how to set it to be true color?

More spesific I want a TListBox with 16bit bitmap on it.. How can I do that?
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Question by:mortenmo
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BoRiS earned 200 total points
ID: 1347265
mortenmo

Here is a simple component that does that but it is still in beta so you may need to get your hands dirty...

unit TransListBox;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TTransListBox = class(TListbox)
  private
    FBitmap : TBitmap;
  protected
    Constructor Create (AnOwner : TComponent); overRide;
    Destructor Destroy; Override;
    Procedure DefaultHandler (Var Message); Override;
    Procedure WM_EraseBkGnd(Var Msg : TWMEraseBkGnd); Message WM_EraseBkGnd;
    Procedure SetBitmap(NewBitmap : TBitmap);
  public
 
  published
   
    Property Bitmap : TBitmap Read fBitmap Write SetBitmap;
  end;

procedure Register;

implementation

Constructor TTransListbox.Create (AnOwner : TComponent);
Begin
  Inherited Create(AnOwner);
  FBitmap := TBitmap.Create;
  Color := clNone;  // Setting to clWindow causes the strange behavior we are all familiar with.
End;

Destructor TTransListbox.Destroy;
Begin
  fBitmap.Free;
  Inherited Destroy;
End;

Procedure TTransListbox.SetBitmap(NewBitmap : TBitmap);
Begin
  FBitmap.Assign(NewBitmap);
End;

Procedure TTransListbox.DefaultHandler (Var Message);
Begin
  Inherited DefaultHandler(Message);
  With TMessage(Message) Do
  Begin
    Case Msg Of
      cn_CTLCOLORMSGBOX..cn_CTLCOLORSTATIC:
        begin
          SetBkMode(WParam, Transparent);
        end;
    End;
  End;
End;

Procedure TTransListbox.WM_EraseBkGnd(Var Msg : TWMEraseBkGnd);
Var
  Canvas : TCanvas;
Begin
  Inherited;
   Msg.Result := 0;
// Draw your own custom background here.
  Canvas := TCanvas.Create;
  Canvas.Handle := msg.DC;
  Canvas.Draw(0,0,fBitmap);
  Canvas.Free;
   Msg.Result := 1;
End;

procedure Register;
begin
  RegisterComponents('BoRiS', [TTransListbox]);
end;

end.


This component will allow you to choose a picture for the background of the listbox, but like i said this is still in beta and my be abit buggy, but you will get the general idea form here...

Later
BoRiS
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