Question

Screensaver with preview, how to scale

Asked by: formi

How can I scale my screensaver for the preview-window. If the parameter is /P I set the ParentWindow of my saver to the handle I get in parameter2. It works, but the preview is fullsized, i.e. I can not see elements outside the window. Thanks for your answers, Peter

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Asked On
2009-11-04 at 03:36:08ID24870530
Tags

Delphi

,

screensaver

,

preview

Topics

Delphi Programming

,

Windows Programming

Participating Experts
3
Points
500
Comments
10

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Answers

 

by: KoenVandemoortelPosted on 2009-11-04 at 05:35:52ID: 25739090

A screensaver is ment to cover the whole screen, that's the whole idea.
So, I think it's easier to change the resolution settings of your screen temporarily for this test.

 

by: formiPosted on 2009-11-04 at 06:32:59ID: 25739619

If you configure the screensaver windows has a small preview-window where you can see the screensaver - that's what I want

 

by: Idle_MindPosted on 2009-11-04 at 06:40:32ID: 25739692

Never used Delphi before...but if you use /p and are getting a handle passed to you then use the GetWindowRect() API to figure out how big the window associated with that handle is in Pixels.  Then you can adjust your drawing code accordingly...

 

by: LukA_YJKPosted on 2009-11-05 at 14:41:38ID: 25754910

I did it long ago, through calling the following procedure:

procedure TFormMain.RunPreview(TargetHandle: THandle);
var PrevRect: TRect;
begin
  //Application.ShowMainForm := False;
  while not IsWindowVisible(TargetHandle) do
    Application.ProcessMessages;
  GetWindowRect(TargetHandle, PrevRect);
  PrevRect.Right  := PrevRect.Right - PrevRect.Left;
  PrevRect.Bottom := PrevRect.Bottom - PrevRect.Top;
  PrevRect.Left := 0; PrevRect.Top := 0;

  Parent := FindControl(TargetHandle);
  Top := 0; Left := 0;
  Width := PrevRect.Right;
  Height := PrevRect.Bottom;

  DrawingCanvas := TCanvas.Create;
  DrawingCanvas.Handle := GetDC(svrParam);
  while IsWindowVisible(TargetHandle) do  begin
    TimerTimer(self);
    Sleep(Timer.Interval);
  end;
  ReleaseDC(TargetHandle, DrawingCanvas.Handle);
  Application.Terminate;
end;

The main program in the .dpr file was as in the attachment.

program Scrsaver; 
uses
  Forms,
  Unit1 in 'Unit1.pas' {FormMain},
  UntInit in 'UntInit.pas'; 
{$R *.RES}
{$E scr} // Set the screen saver's extension 
begin
  if svrMode = C_EXECUTE then
  begin
    Application.Initialize;
    Application.CreateForm(TFormMain, FormMain);
    Application.Run;
  end else
  if svrMode = C_PREVIEW then
  begin
    Application.Initialize;
    Application.CreateForm(TFormMain, FormMain);
    FormMain.RunPreview(svrParam);
    //Application.Run;
  end else
  begin
    Application.Initialize;
    Application.MessageBox(PChar(cDialog +#13+ cWebSite), cCaption, 0);
  end
end.

                                              
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by: LukA_YJKPosted on 2009-11-05 at 14:46:07ID: 25754944

So, if you use standard Canvas methods, you can draw everything on a Bitmap named PrevBitmap and then you can use Canvas.StretchDraw(PrevRect, PrevBitmap);

 

by: formiPosted on 2009-11-06 at 00:54:35ID: 25757621

Is it possible to stretch a whole form (TForm)? On my form there are components that moves and I want to show that too. I think with StretchDraw I can only draw a static image?

 

by: LukA_YJKPosted on 2009-11-06 at 01:15:16ID: 25757694

A static image redrawn after certain intervals of time becomes dynamic, doesn't? This is what the following loop is all about. You could do your painting through drawing on canvas, it is more advanced to moving graphical objects around.

  while IsWindowVisible(TargetHandle) do  begin
    TimerTimer(self);
    Sleep(Timer.Interval);
  end;

                                              
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by: formiPosted on 2009-11-06 at 01:17:39ID: 31649925

Thanks for your help. It's not what I dreamed of - but a possible solution :-)

 

by: LukA_YJKPosted on 2009-11-06 at 01:17:48ID: 25757708

And TimerTimer would do some drawing on the Canvas:

procedure TFormMain.TimerTimer(Sender: TObject);
begin
  with DrawingCanvas do begin
    CopyMode := cmMergePaint;
    Pen.Width := Random(MAX_PEN_WIDTH);
    Pen.Color := RGB(Random(MAX_COLOR_RED),
                     Random(MAX_COLOR_GREEN),
                     Random(MAX_COLOR_BLUE));
    MoveTo(Random(ClientWidth), Random(ClientHeight));
    LineTo(Random(ClientWidth), Random(ClientHeight));
  end;
end;

                                              
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by: LukA_YJKPosted on 2009-11-06 at 01:20:18ID: 25757718

For the future, don't expect somebody to make your dreams come true, do it yourself :-)

20120131-EE-VQP-002

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