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List: kde-panel-devel
Subject: Review Request 113443: Attempt to unbreak pre-configuring QML applets via desktop scripting
From: "Eike Hein" <hein () kde ! org>
Date: 2013-10-26 0:55:56
Message-ID: 20131026005556.21798.55477 () vidsolbach ! de
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This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/113443/
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Review request for Plasma, Aaron J. Seigo and Marco Martin.
Repository: kde-workspace
Description
-------
I've noticed that a panel layout JavaScript template file doesn't succeed in \
scripting the config of a pure-QML applet. I.e. this doesn't work:
foo = panel.addWidget("bar");
foo.currentConfigGroup = new Array("General");
foo.writeConfig("foo", "bar");
It does work for C++ applets however. Also, the config does ultimately make it to \
disk, and a subsequent restart of plasma-desktop reads it in just fine. Or even just \
opening and OK'ing the config dialog, even if the setting isn't exposed in the GUI.
So I've been looking at the code a little, and what it comes down to is that \
kde-workspace/libs/plasmagenericshell/scripting/applet.cpp holds an \
Applet::reloadConfig() that calls Plasma::Applet::configChanged(), which, if there's \
a d->script, calls readConfig() on its d->configLoader. ConfigLoader is a \
KConfigSkeleton subclass, and what KCoreConfigSkeleton::readConfig() does is \
explicitly read in the config from disk.
Therefore the attached patch addresses this by calling for a config sync ahead of \
time.
Now, I'm new to those parts of the Plasma code base, and I'm really not sure this is \
a kosher way to go about it. It's not clear to me whether we want to flush to disk at \
that time, or if there might be a prohibitive performance penalty. There may be a way \
to avoid this. Perhaps Plasma::Applet shouldn't clobber the modified config group by \
pulling in from disk -- but perhaps it needs to for other reasons. That's why someone \
with the bigger picture of how the design was supposed to operate needs to review \
this.
Debate welcome. OTOH, I am a bit pressed for time to ideally get this fixed for a \
release, so there'd be some value in a "good enough" too :).
Diffs
-----
libs/plasmagenericshell/scripting/applet.cpp 3c81f77
Diff: http://git.reviewboard.kde.org/r/113443/diff/
Testing
-------
Thanks,
Eike Hein
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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/113443/">http://git.reviewboard.kde.org/r/113443/</a>
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<div>Review request for Plasma, Aaron J. Seigo and Marco Martin.</div>
<div>By Eike Hein.</div>
<div style="margin-top: 1.5em;">
<b style="color: #575012; font-size: 10pt;">Repository: </b>
kde-workspace
</div>
<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;">I've noticed that a panel layout JavaScript template file \
doesn't succeed in scripting the config of a pure-QML applet. I.e. this \
doesn't work:
foo = panel.addWidget("bar");
foo.currentConfigGroup = new Array("General");
foo.writeConfig("foo", "bar");
It does work for C++ applets however. Also, the config does ultimately make it to \
disk, and a subsequent restart of plasma-desktop reads it in just fine. Or even just \
opening and OK'ing the config dialog, even if the setting isn't exposed in \
the GUI.
So I've been looking at the code a little, and what it comes down to is that \
kde-workspace/libs/plasmagenericshell/scripting/applet.cpp holds an \
Applet::reloadConfig() that calls Plasma::Applet::configChanged(), which, if \
there's a d->script, calls readConfig() on its d->configLoader. \
ConfigLoader is a KConfigSkeleton subclass, and what \
KCoreConfigSkeleton::readConfig() does is explicitly read in the config from disk.
Therefore the attached patch addresses this by calling for a config sync ahead of \
time.
Now, I'm new to those parts of the Plasma code base, and I'm really not sure \
this is a kosher way to go about it. It's not clear to me whether we want to \
flush to disk at that time, or if there might be a prohibitive performance penalty. \
There may be a way to avoid this. Perhaps Plasma::Applet shouldn't clobber the \
modified config group by pulling in from disk -- but perhaps it needs to for other \
reasons. That's why someone with the bigger picture of how the design was \
supposed to operate needs to review this.
Debate welcome. OTOH, I am a bit pressed for time to ideally get this fixed for a \
release, so there'd be some value in a "good enough" too :).</pre> \
</td> </tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>libs/plasmagenericshell/scripting/applet.cpp <span style="color: \
grey">(3c81f77)</span></li>
</ul>
<p><a href="http://git.reviewboard.kde.org/r/113443/diff/" style="margin-left: \
3em;">View Diff</a></p>
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