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List:       pykde
Subject:    [PyQt] PyQt5.uic.loadUiType() ignores <customwidgets> for main widget class
From:       Kyle Altendorf <sda () fstab ! net>
Date:       2019-08-04 16:38:28
Message-ID: eb22c4d23715e8aeba85fb61892b8836 () fstab ! net
[Download RAW message or body]

It looks like presently PyQt5.uic.loadUiType() assumes that the .ui 
file's base widget's class is going to be in PyQt5.QtWidgets.  This is 
not the case for mine which often use a custom type specified in the 
<customwidgets> section.

Rather than:
     return (ui_globals[winfo["uiclass"]], getattr(QtWidgets, 
winfo["baseclass"]))

This seems to work:
     ui_base = ui_globals.get(winfo["baseclass"])

     if ui_base is None:
         ui_base = getattr(QtWidgets, winfo["baseclass"])

     return (ui_globals[winfo["uiclass"]], ui_base)

Example code and output are available at:
     https://gist.github.com/altendky/325d0737a923e6f678617364e0f68f83

Output:
     sys.version: 3.7.4 (default, Aug  2 2019, 12:58:45)
     [GCC 6.3.0 20170516]
     sys.platform: linux
     QT_VERSION_STR: 5.13.0
     PYQT_VERSION_STR: 5.13.0
     SIP_VERSION_STR: 4.19.18
     Traceback (most recent call last):
       File "bad3.py", line 50, in <module>
         main()
       File "bad3.py", line 46, in main
         Ui, UiBase = PyQt5.uic.loadUiType(io.StringIO(ui_text))
       File 
"/home/altendky/st.src/venv/lib/python3.7/site-packages/PyQt5/uic/__init__.py", 
line 204, in loadUiType
         return (ui_globals[winfo["uiclass"]], getattr(QtWidgets, 
winfo["baseclass"]))
     AttributeError: module 'PyQt5.QtWidgets' has no attribute 'MyWidget'

I'll attach my files again here but last time they didn't seem to be 
liked.  If anyone has suggestions on what I should do differently when 
attaching I'm happy to hear them.  I'm using RoundCube webmail.

Cheers,
-kyle

["bad3.py" (text/x-python)]

import io
import sys

import PyQt5.QtCore
import PyQt5.QtWidgets
import PyQt5.uic
import sip


system_info = f'''\
sys.version: {sys.version}
sys.platform: {sys.platform}
QT_VERSION_STR: {PyQt5.QtCore.QT_VERSION_STR}
PYQT_VERSION_STR: {PyQt5.QtCore.PYQT_VERSION_STR}
SIP_VERSION_STR: {sip.SIP_VERSION_STR}'''


ui_text = '''\
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Form</class>
 <widget class="MyWidget" name="Form">
  <layout class="QVBoxLayout" name="layout">
  </layout>
 </widget>
 <customwidgets>
  <customwidget>
   <class>MyWidget</class>
   <extends>QWidget</extends>
   <header>bad3</header>
  </customwidget>
 </customwidgets>
 <resources/>
 <connections/>
</ui>
'''

class MyWidget(PyQt5.QtWidgets.QWidget):
    pass


def main():
    print(system_info)
    app = PyQt5.QtWidgets.QApplication([])

    Ui, UiBase = PyQt5.uic.loadUiType(io.StringIO(ui_text))


if __name__ == '__main__':
    main()


    #exec(code_string.getvalue(), ui_globals)
    #ui_base = ui_globals.get(winfo["baseclass"])
    #if ui_base is None:
        #ui_base = getattr(QtWidgets, winfo["baseclass"])
    #return (ui_globals[winfo["uiclass"]], ui_base)

["out" (text/x-c)]

 ~/st.src  �  boots ●  venv/bin/python bad3.py
sys.version: 3.7.4 (default, Aug  2 2019, 12:58:45) 
[GCC 6.3.0 20170516]
sys.platform: linux
QT_VERSION_STR: 5.13.0
PYQT_VERSION_STR: 5.13.0
SIP_VERSION_STR: 4.19.18
Traceback (most recent call last):
  File "bad3.py", line 50, in <module>
    main()
  File "bad3.py", line 46, in main
    Ui, UiBase = PyQt5.uic.loadUiType(io.StringIO(ui_text))
  File "/home/altendky/st.src/venv/lib/python3.7/site-packages/PyQt5/uic/__init__.py", \
line 204, in loadUiType  return (ui_globals[winfo["uiclass"]], getattr(QtWidgets, \
                winfo["baseclass"]))
AttributeError: module 'PyQt5.QtWidgets' has no attribute 'MyWidget'


[Attachment #5 (text/plain)]

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