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Date Posted: 22:52:33 12/07/03 Sun
Author: Michel
Subject: Re: You have probably already answered this but...Help!
In reply to: Dave Bracken 's message, "You have probably already answered this but...Help!" on 13:29:03 12/05/03 Fri

Hi Dave,

The ZoomChange is triggered after the zoom is changed so it does not help you to prevent the change. You should simply apply the same logic when assign a new zoom value to the TImageScrollBox.ZoomPercent property. For example, in the DemoForm.Pas example, this is done in the TMainForm.ZoomEditChange method.

Best regards,


>I need to know how to limit zooming in on an image to
>a certain percent. I tried testing the zoompercent in
>onzoomchanged, but that did not work. You can see it
>in the following code:
>procedure TForm1.ImageScrollBox1ZoomChange(const
>Sender: TImageScrollBox;
> const Zoom: Single);
> if ZoomedMax then begin
> exit;
> end;
> if ImageScrollBox1.ZoomPercent > 200 then begin
> Screen.Cursor := crHourGlass; //this also does not
> Application.ProcessMessages;
> ImageScrollBox1.ZoomPercent := 200;
> ZoomedMax := true;
> Screen.Cursor := crDefault;
> end;
> Hpos := ImageScrollBox1.HorzScrollBar.Position;
> Vpos := ImageScrollBox1.VertScrollBar.Position;
>I tried to look through your example, and could not
>find any indication there either.
>I need to limit this because it severely slows down my
>system, and takes up quite alot of memory to zoom very
>I would appreciate any help you can give.

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