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Date Posted: 08:26:17 04/07/01 Sat
Author: Michel
Subject: Re: Error in OnZoomChange event???
In reply to: Timo Meier 's message, "Re: Error in OnZoomChange event???" on 03:23:37 04/07/01 Sat

Hi Timo,

Indeed when changing fractional zoom quantities the OnZoomChange was not changed when going from a fractional to a integral value. Here are the changes necessary to correct this:

1. Add an FLastZoomPercent data member in TImageScrollBox
FZoomPercent : Single;
FLastZoomPercent : Single; <-- add this line

2. Modify .SetZoomPercent

if FSourceGraphic.IsEmpty or (InPercent <= 0.1) then

FLastZoomPercent := FZoomPercent; <-- add this line
FZoomPercent := InPercent;

3. In .Redraw, near RecalcZoom, change the code as below and remove the OldZoom variable
in the var section of the method.

{ MB Mar 02, 2000. Move outside of RedrawBW and RedrawNotBW.
MB Apr 04, 2001. Change triggering of OnZoomChange by adding
the FLastZoomPercent data member }
ZoomChanged := (FLastZoomPercent <> FZoomPercent);
if Assigned(FOnZoomChange) and ZoomChanged then
FOnZoomChange(Self, FZoomPercent);
FLastZoomPercent := FZoomPercent;

Best regards,


>Have you found the something?

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