Re: [perl-win32-gui-hackers] Main Commit

[Jez W. <je...@je...>]

As a quick reply, I have noticed other 'issues' with scrolling, typically 
when large values are used for the scroll range, I'm not sure if it's a 
win32::gui thing, a windows thing or a bug- it might or might not be related 
to issue you've highlighted.

Cheers,

jez.
----- Original Message ----- 
From: "Glenn Linderman" <pe...@ne...>
To: "Jez White" <je...@je...>
Cc: "Laurent ROCHER" <ro...@cl...>; 
<per...@li...>
Sent: Thursday, September 30, 2004 3:57 PM
Subject: Re: [perl-win32-gui-hackers] Main Commit


> Now you know I'm not really a Windows GUI expert.    I'm going to look now 
> at updating my applications in the same manner as Laurent updated the 
> sample code.
>
> But I've recently noticed something in the sample bitmap scrolling code, 
> which I am gratefully using in a couple of my applications, which is more 
> obvious when displaying Black & White line art that extends to the very 
> edge of the BMP, rather than full-color images, although once you know to 
> look for it, it can be seen with full-color images also.
>
> When scrolling to the complete right/bottom of a bitmap in a smaller 
> window, especially when scrolling via "pages" by clicking on the empty 
> area of the scroll bar, it becomes clear that the right-/bottom-most 
> column/row of pixels in the window does not get redrawn at the very end. 
> It is like there is an off-by-one error somewhere in the code.
>
> Now I notice the scrolling limits are based on Win32::GUI::Width, and that 
> Win32::GUI::Width calculates width as Right-Left.  Now I don't know the 
> Windows spec well enough to know if it should be Right-Left+1 -- in other 
> words, in Right the last drawable pixel, or the first non-drawable pixel? 
> Of course, maybe the off-by-one error is somewhere else instead; this 
> possible source of the off-by-one is just speculation on my part that I 
> haven't yet confirmed or discarded by reading the Windows documentation. 
> But the scrolling bug exists, regardless of where the off-by-one error 
> creeps in.
>
>
> On approximately 9/30/2004 12:01 AM, came the following characters from 
> the keyboard of Jez White:
>> Hi,
>>  I've just tested the changes to the -onpaint event and it looks good:)
>>  Cheers,
>>  jez.
>>
>>     ----- Original Message -----
>>     *From:* Laurent ROCHER <mailto:ro...@cl...>
>>     *To:* per...@li...
>>     <mailto:per...@li...>
>>     *Sent:* Wednesday, September 29, 2004 10:22 PM
>>     *Subject:* [perl-win32-gui-hackers] Main Commit
>>
>>     Hi,
>>      Changelog
>>      - MakeFile.pl, MakeFile_m.pl
>>             + Use tab as space in rule for use with dmake
>>         - GUI.pm, GUI.xs
>>             + Add -brush option for Win32::GUI::Class.
>>         - GUI_Helper.cpp
>>             + classname_From and handle_From : Replace strlen as static
>>     string length.
>>         - Window.xs, GUI_MessageLoops.cpp, Samples\BitmpaScroll.pl :
>>             + Move Paint event in Window_onEvent.
>>             + Use DoEvent_Paint function like Graphic
>>         - ToolTip.xs :
>>             + Add -balloon option
>>      Laurent.
>
> -- 
> Glenn -- http://nevcal.com/
> ===========================
> The best part about procrastination is that you are never bored,
> because you have all kinds of things that you should be doing.
>
>
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