Well, I've just found some MSDN that declares:
The coordinates returned by GetClientRect() are not inclusive. For example,
> to draw a border around the edge of the client area, draw it from the
> coordinates (Rectangle.left, Rectangle.top) to (Rectangle.right-1,
> Rectangle.bottom-1).
So it would appear, that whereever the off-by-one error is, it is not in
sub Win32::GUI::Width.
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" <[EMAIL PROTECTED]>
To: "Jez White" <[EMAIL PROTECTED]>
Cc: "Laurent ROCHER" <[EMAIL PROTECTED]>;
<perl-win32-gui-hackers@lists.sourceforge.net>
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:[EMAIL PROTECTED]>
*To:* perl-win32-gui-hackers@lists.sourceforge.net
<mailto:perl-win32-gui-hackers@lists.sourceforge.net>
*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/
===========================
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because you have all kinds of things that you should be doing.
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===========================
The best part about procrastination is that you are never bored,
because you have all kinds of things that you should be doing.
