Hi William, On Thu, May 10, 2012 at 8:26 AM, William Kyngesburye <[email protected]>wrote:
> On May 9, 2012, at 12:08 PM, Larry Shaffer wrote: > > > During a recent audit of almost every PyQGIS plugin (casually studying > repetitive design patterns) and helping some users on gis.stackexhange.com[0] > I have come across an issue that may affect over 30 plugins (for now, > only on Mac). > > > > 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?). > > > 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). > 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'? [0] http://qt-project.org/doc/qt-4.8/configure-options.html [1] http://osgeo-org.1560.n6.nabble.com/OS-X-QtWebKit-problem-fixed-PyQwt-still-broken-td4513113.html#a4519323 > > 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. > > > > Can someone else verify these findings? > > > > 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?) > > > 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. > 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. > > Here are the plugins I have found that use the deprecated activated() > signal, including two core C++ [2] > > 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) > 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. [2] http://plugins.qgis.org/plugins/HelloWorld/ > > 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.) > > > > Please correct me if I am off on my assessment of this situation, or if > I am late to the discussion. > > > > [0] http://gis.stackexchange.com/a/22953/6725 , > http://gis.stackexchange.com/a/24860/6725 > > [1] http://trac.osgeo.org/osgeo4w/wiki/pkg-qt4-libs > > [2] > http://dl.dropbox.com/u/4058089/qgis/plugins_contain-qt3activated.txt > > [3] > http://dl.dropbox.com/u/4058089/qgis/plugins_contain-qt3activated.zip > > > > Regards, > > > > Larry Shaffer > > Dakota Cartography > > Black Hills, South Dakota > > _______________________________________________ > > Qgis-developer mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/qgis-developer > > ----- > William Kyngesburye <kyngchaos*at*kyngchaos*dot*com> > http://www.kyngchaos.com/ > > "History is an illusion caused by the passage of time, and time is an > illusion caused by the passage of history." > > - Hitchhiker's Guide to the Galaxy > > >
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