Title: show a indeterminate ProgressBar in Win XP?
{
Use this ProgressBar when you do not know the amount of progress toward
completion but wish to indicate that progress is being made.
This ProgressBar works only on Windows XP and the ComCtl32.dll version
6.00 or later is needed. To use the new ComCtrl you have to provide the manifest.
In Delphi 7 just drop TXPManifest on the form. For prior versions of Delphi
you have to include the XP manifest resource.
}
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.