[PyQt] Changing current runtime directory prevent icons to be loaded from *.ui files

[Phil Thompson]

On Fri, 16 Apr 2010 13:10:53 +0200, Yann Cointepas <yann at sapetnioc.org>
wrote:
> Icons file names are relative  in *.ui files. When loadUi is used, PyQt4
> (at
> least for version 4.3.3) directly sends this relative path to QIcon
> constructor. As a result icons cannot be loaded if Python current
directory
> is not the directory of the *.ui file. Changing the runtime directory
> before
> calling loadUi is not always possible. For instance if you are in a
> multithreaded application you may have problems if some threads are using
> the current directory.
> 
> A solution could be to have a base directory for relative paths for each
> *.ui file parser. This base directory would be set to the directory
> containing the ui file. This can be done by modifying the
> PyQt4.uic.properties.Property class so that the _iconset method uses this
> base directory. Others methods could be changed in the same way (_pixmap
> for
> instance). The following example show how _iconset could be modified to
> take
> into account a base directory stored in an attribute named
_basedirectory:
> 
> Current code (from PyQt 4.3.3 installed on Linux):
> 
>     def _iconset(self, prop):
>         return QtGui.QIcon(prop.text.replace("\\", "\\\\"))
> 
> Modified code:
> 
>     def _iconset(self, prop):
>         return
> QtGui.QIcon(os.path.join(self._basedirectory,prop.text).replace("\\",
> "\\\\"))
> 
> For current version of PyQt, it is possible to use the following ugly
code
> do define a replacement function to loadUi:
> 
> import os
> from functools import partial
> from PyQt4 import QtGui, uic
> from PyQt4.uic.Loader import loader
> 
> def _iconset(self, prop):
>   return QtGui.QIcon( os.path.join( self._basedirectory, prop.text
> ).replace("\\", "\\\\") )
> 
> def loadUiWithIcons( ui, *args, **kwargs ):
>   uiLoader = loader.DynamicUILoader()
>   uiLoader.wprops._basedirectory = os.path.dirname( os.path.abspath( ui )
)
>   uiLoader.wprops._iconset = partial( _iconset, uiLoader.wprops )
>   return uiLoader.loadUi( ui, *args, **kwargs )
> 
> 
>       Yann

I've changed loadUi() so that image files with relative names (and not
referring to resource files) will be relative to the directory containing
the .ui file.

Phil