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List: kde-panel-devel
Subject: Re: Review Request: Fix KSelectionWatcher / KWindowSystem::compositingChanged signal
From: Thomas_Lübking <thomas.luebking () web ! de>
Date: 2013-01-05 16:32:14
Message-ID: 20130105163214.8814.17102 () vidsolbach ! de
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> On Jan. 5, 2013, 3:13 p.m., Fredrik Höglund wrote:
> > Because the XFixesSelectSelectionInput() call specifies that the event should be \
> > delivered to winId(). KSelectionOwner does not send XFixes events; they are \
> > generated by the X server.
Ok, problem is: whether by compiz, e17, kwin, xcompmgr - the event occurs on the root \
but not on winId() - even for the simplistic testcase (which also works on \
QApplication but for the selectionwatcher)
I tried adding some junk into XFixesSelectSelectionInput and get a request error (as \
expected)
X Error: BadWindow (invalid Window parameter) 3
Extension: 138 (Uknown extension)
Minor opcode: 2 (Unknown request)
Resource id: 0x3039
yet KWindowSystem fires on compositing toggle.
Then i removed XFixesSelectSelectionInput - and still (patched to check against root) \
KWindowSystem fires on compositing toggle.
Now it gets interesting (I removed the KSelectionWatcher bits for the last tests):
-----------------------------------------------------------------------------------------
If i keep XFixesSelectSelectionInput AND the check against the root window i get \
after the event on root TWO additional events on the winId() If i remove either, i \
get none of them (but still one on the root which however is ignored)
So ulitmately i just ate away (return true) selectionnotify events on the root window \
and in return got ONE additional event on the winId which then fired the signal - \
what is all less then ideal, since (just as the present patch btw.) we also eat away \
"regular" selectionowner events.
- Thomas
-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/107983/#review24751
-----------------------------------------------------------
On Jan. 5, 2013, 2:38 p.m., Thomas Lübking wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/107983/
> -----------------------------------------------------------
>
> (Updated Jan. 5, 2013, 2:38 p.m.)
>
>
> Review request for kdelibs, kwin, Plasma, Aaron J. Seigo, Marco Martin, Martin \
> Gräßlin, and Fredrik Höglund.
>
> Description
> -------
>
> It works fine here (tested so far KWindowSystem signal, KSelectionWatcher only with \
> kwin) with kwin (shift+alt+f12), xcompmgr, compiz & "metacity -c" and e17. Didn't \
> try xfce nor mutter.
> Technically:
> I do not at all understand why KWindowSystem is *not* watching the root window - \
> KSelectionOwner for one is sending events to the root and this also seems the case \
> for all other WMs (at least everything now starts to cause the signal to be \
> emitted)
> The KSelectionWatcher failure seems to be kwin specific (wrote me a cleaner \
> testcase), there'll be some X11 event processing on top that eats away the client \
> messages. So this one can be scratched from the patch, the KWindowSystem issue \
> remains.
>
> This addresses bug 179042.
> http://bugs.kde.org/show_bug.cgi?id=179042
>
>
> Diffs
> -----
>
> kdeui/windowmanagement/kwindowsystem_x11.cpp f9b3cc1
>
> Diff: http://git.reviewboard.kde.org/r/107983/diff/
>
>
> Testing
> -------
>
> see summary
>
>
> Thanks,
>
> Thomas Lübking
>
>
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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/107983/">http://git.reviewboard.kde.org/r/107983/</a>
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<br />
<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: \
10px;"> <p style="margin-top: 0;">On January 5th, 2013, 3:13 p.m., <b>Fredrik \
Höglund</b> wrote:</p> <blockquote style="margin-left: 1em; border-left: 2px solid \
#d0d0d0; padding-left: 10px;"> <pre style="white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">Because the XFixesSelectSelectionInput() call specifies that the event \
should be delivered to winId(). KSelectionOwner does not send XFixes events; they are \
generated by the X server. </pre>
</blockquote>
</blockquote>
<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: \
-pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Ok, problem is: whether \
by compiz, e17, kwin, xcompmgr - the event occurs on the root but not on winId() - \
even for the simplistic testcase (which also works on QApplication but for the \
selectionwatcher)
I tried adding some junk into XFixesSelectSelectionInput and get a request error (as \
expected)
X Error: BadWindow (invalid Window parameter) 3
Extension: 138 (Uknown extension)
Minor opcode: 2 (Unknown request)
Resource id: 0x3039
yet KWindowSystem fires on compositing toggle.
Then i removed XFixesSelectSelectionInput - and still (patched to check against root) \
KWindowSystem fires on compositing toggle.
Now it gets interesting (I removed the KSelectionWatcher bits for the last tests):
-----------------------------------------------------------------------------------------
If i keep XFixesSelectSelectionInput AND the check against the root window i get \
after the event on root TWO additional events on the winId() If i remove either, i \
get none of them (but still one on the root which however is ignored)
So ulitmately i just ate away (return true) selectionnotify events on the root window \
and in return got ONE additional event on the winId which then fired the signal - \
what is all less then ideal, since (just as the present patch btw.) we also eat away \
"regular" selectionowner events.</pre> <br />
<p>- Thomas</p>
<br />
<p>On January 5th, 2013, 2:38 p.m., Thomas Lübking wrote:</p>
<table bgcolor="#fefadf" width="100%" cellspacing="0" cellpadding="8" \
style="background-image: \
url('http://git.reviewboard.kde.org/media/rb/images/review_request_box_top_bg.png'); \
background-position: left top; background-repeat: repeat-x; border: 1px black \
solid;"> <tr>
<td>
<div>Review request for kdelibs, kwin, Plasma, Aaron J. Seigo, Marco Martin, Martin \
Gräßlin, and Fredrik Höglund.</div> <div>By Thomas Lübking.</div>
<p style="color: grey;"><i>Updated Jan. 5, 2013, 2:38 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" \
style="border: 1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">It works fine here (tested so far KWindowSystem signal, \
KSelectionWatcher only with kwin) with kwin (shift+alt+f12), xcompmgr, compiz & \
"metacity -c" and e17. Didn't try xfce nor mutter.
Technically:
I do not at all understand why KWindowSystem is *not* watching the root window - \
KSelectionOwner for one is sending events to the root and this also seems the case \
for all other WMs (at least everything now starts to cause the signal to be emitted)
The KSelectionWatcher failure seems to be kwin specific (wrote me a cleaner \
testcase), there'll be some X11 event processing on top that eats away the client \
messages. So this one can be scratched from the patch, the KWindowSystem issue \
remains.</pre> </td>
</tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: \
1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">see summary</pre> </td>
</tr>
</table>
<div style="margin-top: 1.5em;">
<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="http://bugs.kde.org/show_bug.cgi?id=179042">179042</a>
</div>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>kdeui/windowmanagement/kwindowsystem_x11.cpp <span style="color: \
grey">(f9b3cc1)</span></li>
</ul>
<p><a href="http://git.reviewboard.kde.org/r/107983/diff/" style="margin-left: \
3em;">View Diff</a></p>
</td>
</tr>
</table>
</div>
</body>
</html>
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