Adding a widget to a layout created from .ui file

Question

I am creating a GUI in Python using PySide2, this is my .ui file:

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>main_window</class>
 <widget class="QWidget" name="main_window">
  <property name="windowModality">
   <enum>Qt::NonModal</enum>
  </property>
  <property name="enabled">
   <bool>true</bool>
  </property>
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>1000</width>
    <height>640</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Testing App</string>
  </property>
  <layout class="QVBoxLayout" name="layout">
   <item>
    <layout class="QVBoxLayout" name="other_layout">
     <item>
      <widget class="QWidget" name="panel" native="true">
       <layout class="QHBoxLayout" name="layout3">
        <item>
         <layout class="QVBoxLayout" name="layout4">
          <item>
           <layout class="QHBoxLayout" name="layout5">
            <item>
             <widget class="QLabel" name="lo">
              <property name="text">
               <string>X</string>
              </property>
              <property name="alignment">
               <set>Qt::AlignCenter</set>
              </property>
             </widget>
            </item>
            <item>
             <widget class="QLineEdit" name="resolution_x">
              <property name="sizePolicy">
               <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
                <horstretch>0</horstretch>
                <verstretch>0</verstretch>
               </sizepolicy>
              </property>
              <property name="inputMethodHints">
               <set>Qt::ImhDigitsOnly</set>
              </property>
              <property name="text">
               <string>175</string>
              </property>
             </widget>
            </item>
           </layout>
          </item>
          <item>
           <layout class="QHBoxLayout" name="layout6">
            <item>
             <widget class="QLabel" name="lo2">
              <property name="text">
               <string>Y</string>
              </property>
              <property name="alignment">
               <set>Qt::AlignCenter</set>
              </property>
             </widget>
            </item>
            <item>
             <widget class="QLineEdit" name="res2">
              <property name="sizePolicy">
               <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
                <horstretch>0</horstretch>
                <verstretch>0</verstretch>
               </sizepolicy>
              </property>
              <property name="inputMethodHints">
               <set>Qt::ImhDigitsOnly</set>
              </property>
              <property name="text">
               <string>150</string>
              </property>
             </widget>
            </item>
           </layout>
          </item>
         </layout>
        </item>
        <item>
         <layout class="QVBoxLayout" name="layout7">
          <item>
           <layout class="QHBoxLayout" name="iterations_layout">
            <item>
             <widget class="QLabel" name="iterLab">
              <property name="text">
               <string>Num Passes</string>
              </property>
              <property name="alignment">
               <set>Qt::AlignCenter</set>
              </property>
             </widget>
            </item>
            <item>
             <widget class="QLineEdit" name="itr">
              <property name="sizePolicy">
               <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
                <horstretch>0</horstretch>
                <verstretch>0</verstretch>
               </sizepolicy>
              </property>
              <property name="inputMethodHints">
               <set>Qt::ImhDigitsOnly</set>
              </property>
              <property name="text">
               <string>20</string>
              </property>
             </widget>
            </item>
           </layout>
          </item>
          <item>
           <layout class="QHBoxLayout" name="layout8">
            <item>
             <widget class="QPushButton" name="reset_button">
              <property name="sizePolicy">
               <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
                <horstretch>0</horstretch>
                <verstretch>0</verstretch>
               </sizepolicy>
              </property>
              <property name="minimumSize">
               <size>
                <width>50</width>
                <height>0</height>
               </size>
              </property>
              <property name="layoutDirection">
               <enum>Qt::LeftToRight</enum>
              </property>
              <property name="text">
               <string>Zoom</string>
              </property>
             </widget>
            </item>
           </layout>
          </item>
         </layout>
        </item>
       </layout>
      </widget>
     </item>
     <item>
      <layout class="QHBoxLayout" name="process_layout">
       <item alignment="Qt::AlignLeft">
        <widget class="QLabel" name="status">
         <property name="sizePolicy">
          <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
           <horstretch>0</horstretch>
           <verstretch>0</verstretch>
          </sizepolicy>
         </property>
         <property name="minimumSize">
          <size>
           <width>120</width>
           <height>20</height>
          </size>
         </property>
         <property name="maximumSize">
          <size>
           <width>120</width>
           <height>20</height>
          </size>
         </property>
         <property name="text">
          <string/>
         </property>
         <property name="alignment">
          <set>Qt::AlignCenter</set>
         </property>
        </widget>
       </item>
       <item alignment="Qt::AlignRight">
        <widget class="QLabel" name="procLab">
         <property name="minimumSize">
          <size>
           <width>77</width>
           <height>20</height>
          </size>
         </property>
         <property name="maximumSize">
          <size>
           <width>77</width>
           <height>20</height>
          </size>
         </property>
         <property name="text">
          <string>#</string>
         </property>
        </widget>
       </item>
       <item alignment="Qt::AlignRight">
        <widget class="QLineEdit" name="processes">
         <property name="sizePolicy">
          <sizepolicy hsizetype="Maximum" vsizetype="Fixed">
           <horstretch>0</horstretch>
           <verstretch>0</verstretch>
          </sizepolicy>
         </property>
         <property name="minimumSize">
          <size>
           <width>50</width>
           <height>0</height>
          </size>
         </property>
         <property name="maximumSize">
          <size>
           <width>50</width>
           <height>2000</height>
          </size>
         </property>
         <property name="inputMethodHints">
          <set>Qt::ImhDigitsOnly</set>
         </property>
         <property name="text">
          <string>8</string>
         </property>
        </widget>
       </item>
      </layout>
     </item>
    </layout>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections/>
</ui>

I want to add a widget dynamically from my Python script to the main layout ('layout'):

app = QApplication(sys.argv)
f = MyWindow()
sys.exit(app.exec_())

class MyWindow(QWidget):
    def __init__(self):
        super(MyWindow, self).__init__(None)
        ui_file = QtCore.QFile("./myui.ui")
        ui_file.open(QtCore.QFile.ReadOnly)
        loader = QtUiTools.QUiLoader()
        self.window = loader.load(ui_file)
        ui_file.close()

        self.layout.addWidget(QLabel('Stuff'))

        self.window.show()

However, I get the following error

    self.layout.addWidget(QLabel('Stuff'))
AttributeError: 'builtin_function_or_method' object has no attribute 'addWidget'

I don't understand why self.layout doesn't have the property addWidget. I thought self.layout would have a reference to a QVBoxLayout object?

added more of the .ui file

Pablo
– Pablo

2020-11-29 15:54:23 +00:00
Commented Nov 29, 2020 at 15:54 — Pablo
– Pablo, Commented Nov 29, 2020 at 15:54
@eyllanesc added it

Pablo
– Pablo

2020-11-29 16:04:02 +00:00
Commented Nov 29, 2020 at 16:04 — Pablo
– Pablo, Commented Nov 29, 2020 at 16:04

eyllanesc · Accepted Answer · 2020-11-29 16:30:15Z

You have several errors:

The widget loaded from the .ui is not the MyWindow, on the other hand in PySide2 it is not possible to load a .ui to a widget class implemented by python (in PyQt5 if possible via uic.loadUi()) so the class should handle the widget.
On the other hand, do not use variable names that may conflict with the names of the methods, for example the QWidget class has a layout method so it is not recommended that you have an attribute with that name, a possible solution is to use findChild to get the layout:

import sys

from PySide2.QtCore import QObject, QFile
from PySide2.QtWidgets import QApplication, QLabel, QVBoxLayout, QWidget
from PySide2.QtUiTools import QUiLoader


class Manager(QObject):
    def __init__(self):
        super(Manager, self).__init__(None)
        ui_file = QFile("./myui.ui")
        ui_file.open(QFile.ReadOnly)
        loader = QUiLoader()
        self.window = loader.load(ui_file)
        ui_file.close()
        lay = self.window.findChild(QVBoxLayout, "layout")
        lay.addWidget(QLabel("Stuff"))

        self.window.show()


if __name__ == "__main__":

    app = QApplication(sys.argv)
    f = Manager()
    sys.exit(app.exec_())

Another possible solution is to change the name of the layout to for example vlayout: <layout class="QVBoxLayout" name="vlayout">

import sys

from PySide2.QtCore import QObject, QFile
from PySide2.QtWidgets import QApplication, QLabel, QWidget
from PySide2.QtUiTools import QUiLoader


class Manager(QObject):
    def __init__(self):
        super(Manager, self).__init__(None)
        ui_file = QFile("./myui.ui")
        ui_file.open(QFile.ReadOnly)
        loader = QUiLoader()
        self.window = loader.load(ui_file)
        ui_file.close()
        self.window.vlayout.addWidget(QLabel("Stuff"))

        self.window.show()


if __name__ == "__main__":

    app = QApplication(sys.argv)
    f = Manager()
    sys.exit(app.exec_())

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