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

[Glenn L. <pe...@ne...>]

Is that with the bitmap scrolling, or other scrolling?  I've used the 
bitmap scrolling with values up to about 4000 vertical and 2400 
horizontal so far, and except for the off-by-one issue I noted, have had 
no problems.  I'm not sure if 4000 qualifies as one of your "large 
values",  nor what the "issues" look like :)

On approximately 9/30/2004 8:09 AM, came the following characters from 
the keyboard of Jez White:
> 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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> 
> 
> 
> 
> 

-- 
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.