Hi William,<br><br><div class="gmail_quote">On Thu, May 10, 2012 at 8:26 AM, William Kyngesburye <span dir="ltr"><<a href="mailto:woklist@kyngchaos.com" target="_blank">woklist@kyngchaos.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On May 9, 2012, at 12:08 PM, Larry Shaffer wrote:<br>
<br>
> During a recent audit of almost every PyQGIS plugin (casually studying repetitive design patterns) and helping some users on <a href="http://gis.stackexhange.com" target="_blank">gis.stackexhange.com</a> [0] I have come across an issue that may affect over 30 plugins (for now, only on Mac).<br>
><br>
> From what I can gather, William Kyngesburye's Mac builds (and Unix/Linux, too?) consistently use a current, stable version of Qt, now at 4.8, while the OSGEO4W package is at 4.4 [1]. This hasn't been an issue since, I believe (and assume), the bundled Qt in Mac builds included Qt3 support. The most recent 1.7.4 Mac version appears to have a bundled Qt with no Qt3 support (is this correct?).<br>
><br>
I haven't included Qt3Support since QGIS 1.2, when the last of the Qt3 usage was removed (I think GRASS plugin was the last holdout).<br></blockquote><div><br>I'm referring to Qt4 being compiled with the legacy '-qt3support' option (supposedly on by
default [0]), not direct Qt3 support (frameworks, etc). Recently, when there was an
issue with QWebKit on 10.6, you posted a configure line for compiling Qt4 to fix the
problem [1]. I noted that you chose the '-no-qt3support' option. Is that the same Qt you used for bundling the recent QGIS 1.7.4-x? Had you nixed -qt3support in past builds, or used Nokia's pre-compiled Qt4 builds with '-qt3support'?<br>
<br>[0] <a href="http://qt-project.org/doc/qt-4.8/configure-options.html">http://qt-project.org/doc/qt-4.8/configure-options.html</a><br>[1] <a href="http://osgeo-org.1560.n6.nabble.com/OS-X-QtWebKit-problem-fixed-PyQwt-still-broken-td4513113.html#a4519323">http://osgeo-org.1560.n6.nabble.com/OS-X-QtWebKit-problem-fixed-PyQwt-still-broken-td4513113.html#a4519323</a><br>
</div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
> This has caused many PyQGIS plugins to fail to launch on Mac, due to their use of a Qt3-only QAction signal of activated() in a plugin's initGui() method. Basically, the plugin does not launch (i.e. does nothing), with no error. However, for Windows users, the plugin launches fine, causing problems when trying to offer cross-platform support for plugin issues.<br>
><br>
> Can someone else verify these findings?<br>
><br>
> I am slightly surprised Qt3 is still supported, and think dropping its support sounds like a good idea, especially for QGIS version 1.8 or >, but certainly don't know all the details on versioning for QGIS distributions. I understand this may cause problems with the OSGEO4W package. (btw: Why is it still on Qt 4.4?)<br>
><br>
I would assume that Qt3 usage in external plugins would require support in PyQt, but PyQt has never compiled a PyQt3 module for me, and I'm not sure if it can, or how.<br></blockquote><div>
<br>Can you think of anything else that might have caused this issue,
via differences between your 1.7.3 and 1.7.4 builds? It may be even
between the latest 1.7.4-x builds. I can try to re-install each of the
versions to find when the issue occurs.<br><br> </div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
> Here are the plugins I have found that use the deprecated activated() signal, including two core C++ [2]<br>
<br>
This is odd because those plugins then should not even compile if Qt3 is missing. And spatialquery works for me without Qt3Support. (GRASS works, but has its own problems)<br></blockquote><div><br>The 'Hello World' plugin is the simplest for testing/exhibiting the
issue [2]. Odd that I get no launch of Spatial Query plugin, on all my
1.7.4-4 installs, but you're having success with it.<br>
<br>
[2] <a href="http://plugins.qgis.org/plugins/HelloWorld/">http://plugins.qgis.org/plugins/HelloWorld/</a><br><br> </div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
> and a ZIP archive of the particular files that I found to contain that signal [3]. Without a complete examination of each plugin, I am not entirely certain all of the signals are of QAction. I tried to include only those that appear to be. (Note: there may be more uses of Qt3 deprecated methods, etc.)<br>
><br>
> Please correct me if I am off on my assessment of this situation, or if I am late to the discussion.<br>
><br>
> [0] <a href="http://gis.stackexchange.com/a/22953/6725" target="_blank">http://gis.stackexchange.com/a/22953/6725</a> , <a href="http://gis.stackexchange.com/a/24860/6725" target="_blank">http://gis.stackexchange.com/a/24860/6725</a><br>
> [1] <a href="http://trac.osgeo.org/osgeo4w/wiki/pkg-qt4-libs" target="_blank">http://trac.osgeo.org/osgeo4w/wiki/pkg-qt4-libs</a><br>
> [2] <a href="http://dl.dropbox.com/u/4058089/qgis/plugins_contain-qt3activated.txt" target="_blank">http://dl.dropbox.com/u/4058089/qgis/plugins_contain-qt3activated.txt</a><br>
> [3] <a href="http://dl.dropbox.com/u/4058089/qgis/plugins_contain-qt3activated.zip" target="_blank">http://dl.dropbox.com/u/4058089/qgis/plugins_contain-qt3activated.zip</a><br>
><br>
> Regards,<br>
><br>
> Larry Shaffer<br>
> Dakota Cartography<br>
> Black Hills, South Dakota<br>
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<br>
-----<br>
William Kyngesburye <kyngchaos*at*kyngchaos*dot*com><br>
<a href="http://www.kyngchaos.com/" target="_blank">http://www.kyngchaos.com/</a><br>
<br>
"History is an illusion caused by the passage of time, and time is an illusion caused by the passage of history."<br>
<br>
- Hitchhiker's Guide to the Galaxy<br>
<br>
<br>
</blockquote></div><br>