Title: How to show a indeterminate ProgressBar in Win XP
unit MarqueeProgressBar;
interface
uses
SysUtils, Windows, Classes, Controls, ComCtrls, Messages;
type
TMarqueeProgressBar = class(TProgressBar)
private
FActive: Boolean;
FAnimationSpeed: Integer;
procedure SetActive(const Value: Boolean);
procedure SetAnimationSpeed(const Value: Integer);
procedure UpdateProgressBar;
protected
procedure CreateParams(var Params: TCreateParams); override;
public
constructor Create(AOwner: TComponent); override;
published
property Active: Boolean read FActive write SetActive;
property AnimationSpeed: Integer read FAnimationSpeed write SetAnimationSpeed;
end;
const
PBS_MARQUEE = $08;
PBM_SETMARQUEE = WM_USER 10;
procedure Register;
implementation
procedure Register;
begin
RegisterComponents('SwissDelphiCenter', [TMarqueeProgressBar]);
end;
constructor TMarqueeProgressBar.Create(AOwner: TComponent);
begin
inherited;
FAnimationSpeed := 60;
end;
procedure TMarqueeProgressBar.CreateParams(var Params: TCreateParams);
begin
inherited;
Params.Style := Params.Style or PBS_MARQUEE;
end;
procedure TMarqueeProgressBar.SetActive(const Value: Boolean);
begin
FActive := Value;
UpdateProgressBar;
end;
procedure TMarqueeProgressBar.SetAnimationSpeed(const Value: Integer);
begin
FAnimationSpeed := Value;
UpdateProgressBar;
end;
procedure TMarqueeProgressBar.UpdateProgressBar;
begin
if FActive then
SendMessage(Self.Handle, PBM_SETMARQUEE, 1, FAnimationSpeed)
else
SendMessage(Self.Handle, PBM_SETMARQUEE, 0, 0);
end;
end.
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