माउसप्रेसइवेंट को अधिलेखित करने के बाद क्यूटी विजेट का आकार बदलना

मैं QtTreeView विजेट में एक संदर्भ मेनू लागू करने का प्रयास कर रहा हूं। में सलाह का उपयोग करना मैंने QTreeView का एक उप वर्ग बनाया है :

class TreeView(QTreeView):
def mousePressEvent(self, event):
    if event.type() == QEvent.MouseButtonPress:
        if event.button() == Qt.LeftButton:
            print( "Left click")
        elif event.button() == Qt.RightButton:
            print( "Right click")
        elif event.button() == Qt.MiddleButton:
            print( "Middle click")
    super(TreeView, self).mousePressEvent(event)

जिसे मैं QtTreeView (जिसे मैंने Qt डिज़ाइनर में डिज़ाइन किया है) को इस प्रकार अधिलेखित कर रहा हूँ:

self.dockWidget.treeView = TreeView(self.dockWidget.treeView)

यह काम करता है और ट्री व्यू में माउसप्रेस एवेन्ट्स को कैप्चर करने की अनुमति देता है लेकिन यह ट्री व्यू में सामग्री के आकार को बदलता है:

जब यह दिखना चाहिए:

मैंने SizePolicy सेट करने का प्रयास किया है:

self.dockWidget.treeView.setSizePolicy(QSizePolicy.Expanding,QSizePolicy.Expanding)

लेकिन इससे कोई फर्क नहीं पड़ रहा है। मैं इसे आकार बदलने से रोकने के लिए या इसे बदलने के बाद इसे अपने मूल आकार में वापस करने का एक तरीका ढूंढ रहा हूं।

रेप्रेक्स - 3 फाइलें:

Main.py

from PyQt5.QtWidgets import QApplication, QMainWindow, QDockWidget, 
QListWidget,QTextEdit,QTreeView, QSizePolicy
from PyQt5.QtGui import QIcon, QStandardItemModel
from PyQt5.QtCore import Qt, QEvent
import sys

from utility_core_dockwidget import UtilityDockWidget



class Window(QMainWindow):
    def __init__(self):
        super().__init__()

        title= "Dockable Application"
        top=400
        left=400
        width=600
        height= 500

        icon = "icon.png"

        self.setWindowTitle(title)
        self.setGeometry(top,left,width,height)
        self.setWindowIcon(QIcon("icon.png"))

        self.textEdit = QTextEdit()
        self.setCentralWidget(self.textEdit)
        self.dockAble()
        self.populateTreeView()

    def dockAble(self):
        self.dock = UtilityDockWidget()
        self.dock.treeView= TreeView(self.dock.treeView) #overwriting the treeview with the custom class causes the display issues
        self.addDockWidget(Qt.RightDockWidgetArea,self.dock)
        self.dock.treeView.setSizePolicy(QSizePolicy.Expanding,QSizePolicy.Expanding)

    def populateTreeView(self):
        print("here")
        model = self.createTreeViewLayerModel(self.dock.treeView)
        self.dock.treeView.setModel(model)

        for i in range (1,10):
            layerName= f"LayerName {i}"
            visibility = "Visible"
            layerId = i
            self.addTreeViewItem(model, layerName, visibility, layerId)

    def createTreeViewLayerModel(self,parent):
        model = QStandardItemModel(0, 3, parent)
        model.setHeaderData(0, Qt.Horizontal, "Layer Name")
        model.setHeaderData(1, Qt.Horizontal, "Visibility")
        model.setHeaderData(2, Qt.Horizontal, "Layer ID")

        return model

    def addTreeViewItem(self,model, layerName, visibility,layerId):
        model.insertRow(0)
        model.setData(model.index(0, 0), layerName)
        model.setData(model.index(0, 1), visibility)
        model.setData(model.index(0, 2), layerId)


class TreeView(QTreeView):
    def mousePressEvent(self, event):
        if event.type() == QEvent.MouseButtonPress:
            if event.button() == Qt.LeftButton:
                print( "Left click")
            elif event.button() == Qt.RightButton:
                print( "Right click")
            elif event.button() == Qt.MiddleButton:
                print( "Middle click")
        super(TreeView, self).mousePressEvent(event)

app = QApplication(sys.argv)
window=Window()
window.show()
app.exec()

उपयोगिता_कोर_डॉकविजेट.py:

import os

from PyQt5 import uic, QtWidgets, QtGui
from PyQt5.QtCore import pyqtSignal, Qt


FORM_CLASS, _ = uic.loadUiType(os.path.join(
    os.path.dirname(__file__), 'utility_core_dockwidget_base.ui'))


class UtilityDockWidget(QtWidgets.QDockWidget, FORM_CLASS):

    closingPlugin = pyqtSignal()

    def __init__(self, parent=None):
        """Constructor."""
        super(UtilityDockWidget, self).__init__(parent)
        self.setupUi(self)

    def closeEvent(self, event):
        self.closingPlugin.emit()
        event.accept()

उपयोगिता_कोर_डॉकविजेट_बेस.यूआई:

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>utilityDockWidgetBase</class>
 <widget class="QDockWidget" name="utilityDockWidgetBase">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>660</width>
    <height>807</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Utility</string>
  </property>
  <widget class="QWidget" name="dockWidgetContents">
   <layout class="QHBoxLayout" name="horizontalLayout_7">
    <item>
     <widget class="QTabWidget" name="tabWidget_2">
      <property name="sizePolicy">
       <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
        <horstretch>0</horstretch>
        <verstretch>0</verstretch>
       </sizepolicy>
      </property>
      <property name="minimumSize">
       <size>
        <width>200</width>
        <height>500</height>
       </size>
      </property>
      <property name="currentIndex">
       <number>0</number>
      </property>
      <widget class="QWidget" name="tab_5">
       <attribute name="title">
        <string>Layer Source Changer</string>
       </attribute>
       <layout class="QVBoxLayout" name="verticalLayout_7">
        <item>
         <layout class="QGridLayout" name="gridLayout_2">
          <property name="topMargin">
           <number>6</number>
          </property>
          <item row="1" column="0">
           <widget class="QLabel" name="label_8">
            <property name="font">
             <font>
              <weight>75</weight>
              <bold>true</bold>
             </font>
            </property>
            <property name="text">
             <string>Source List</string>
            </property>
           </widget>
          </item>
          <item row="0" column="1" colspan="2">
           <widget class="QLineEdit" name="searchBar">
            <property name="sizePolicy">
             <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
              <horstretch>0</horstretch>
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
            <property name="maximumSize">
             <size>
              <width>10000</width>
              <height>16777215</height>
             </size>
            </property>
           </widget>
          </item>
          <item row="1" column="1">
           <widget class="QComboBox" name="layerSourceList">
            <property name="sizePolicy">
             <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
              <horstretch>0</horstretch>
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
            <property name="minimumSize">
             <size>
              <width>250</width>
              <height>0</height>
             </size>
            </property>
            <property name="maximumSize">
             <size>
              <width>10000</width>
              <height>16777215</height>
             </size>
            </property>
            <property name="font">
             <font>
              <family>MS Shell Dlg 2</family>
             </font>
            </property>
            <property name="editable">
             <bool>false</bool>
            </property>
           </widget>
          </item>
          <item row="1" column="2">
           <widget class="QPushButton" name="browseNewSource">
            <property name="maximumSize">
             <size>
              <width>35</width>
              <height>16777215</height>
             </size>
            </property>
            <property name="text">
             <string>...</string>
            </property>
           </widget>
          </item>
          <item row="0" column="0">
           <widget class="QLabel" name="label_9">
            <property name="sizePolicy">
             <sizepolicy hsizetype="MinimumExpanding" vsizetype="Preferred">
              <horstretch>0</horstretch>
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
            <property name="maximumSize">
             <size>
              <width>50</width>
              <height>16777215</height>
             </size>
            </property>
            <property name="font">
             <font>
              <weight>75</weight>
              <bold>true</bold>
             </font>
            </property>
            <property name="layoutDirection">
             <enum>Qt::LeftToRight</enum>
            </property>
            <property name="autoFillBackground">
             <bool>false</bool>
            </property>
            <property name="text">
             <string>Search</string>
            </property>
           </widget>
          </item>
         </layout>
        </item>
        <item>
         <layout class="QHBoxLayout" name="horizontalLayout_8">
          <item>
           <widget class="QPushButton" name="refreshComboBox">
            <property name="sizePolicy">
             <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
              <horstretch>0</horstretch>
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
            <property name="minimumSize">
             <size>
              <width>75</width>
              <height>0</height>
             </size>
            </property>
            <property name="maximumSize">
             <size>
              <width>120</width>
              <height>16777215</height>
             </size>
            </property>
            <property name="text">
             <string>Refresh Sources</string>
            </property>
           </widget>
          </item>
          <item>
           <widget class="QCheckBox" name="onlyVisibleCheckbox">
            <property name="layoutDirection">
             <enum>Qt::LeftToRight</enum>
            </property>
            <property name="text">
             <string>Only Visible Layers</string>
            </property>
           </widget>
          </item>
         </layout>
        </item>
        <item>
         <layout class="QGridLayout" name="gridLayout_4">
          <property name="topMargin">
           <number>10</number>
          </property>
          <item row="1" column="0">
           <widget class="QPushButton" name="updateSelectedButton">
            <property name="sizePolicy">
             <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
              <horstretch>0</horstretch>
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
            <property name="minimumSize">
             <size>
              <width>110</width>
              <height>0</height>
             </size>
            </property>
            <property name="maximumSize">
             <size>
              <width>100</width>
              <height>16777215</height>
             </size>
            </property>
            <property name="text">
             <string>Update Selected</string>
            </property>
           </widget>
          </item>
          <item row="1" column="1">
           <widget class="QPushButton" name="updateAllButton">
            <property name="minimumSize">
             <size>
              <width>110</width>
              <height>0</height>
             </size>
            </property>
            <property name="maximumSize">
             <size>
              <width>110</width>
              <height>16777215</height>
             </size>
            </property>
            <property name="toolTip">
             <string>Update all the layers with sources found in Source List</string>
            </property>
            <property name="text">
             <string>Update All</string>
            </property>
           </widget>
          </item>
          <item row="1" column="2">
           <spacer name="horizontalSpacer_5">
            <property name="orientation">
             <enum>Qt::Horizontal</enum>
            </property>
            <property name="sizeType">
             <enum>QSizePolicy::Expanding</enum>
            </property>
            <property name="sizeHint" stdset="0">
             <size>
              <width>40</width>
              <height>20</height>
             </size>
            </property>
           </spacer>
          </item>
          <item row="2" column="0">
           <widget class="QLabel" name="sourceInformationLabel">
            <property name="maximumSize">
             <size>
              <width>120</width>
              <height>16777215</height>
             </size>
            </property>
            <property name="font">
             <font>
              <weight>75</weight>
              <bold>true</bold>
             </font>
            </property>
            <property name="text">
             <string>Source Information</string>
            </property>
           </widget>
          </item>
          <item row="0" column="0">
           <widget class="QLabel" name="label_10">
            <property name="sizePolicy">
             <sizepolicy hsizetype="MinimumExpanding" vsizetype="Preferred">
              <horstretch>0</horstretch>
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
            <property name="maximumSize">
             <size>
              <width>110</width>
              <height>16777215</height>
             </size>
            </property>
            <property name="font">
             <font>
              <weight>75</weight>
              <bold>true</bold>
             </font>
            </property>
            <property name="toolTip">
             <string>Update to the latest version</string>
            </property>
            <property name="text">
             <string>Automatic Options</string>
            </property>
           </widget>
          </item>
         </layout>
        </item>
        <item>
         <widget class="QTreeView" name="treeView">
          <property name="sizePolicy">
           <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
            <horstretch>0</horstretch>
            <verstretch>0</verstretch>
           </sizepolicy>
          </property>
          <property name="minimumSize">
           <size>
            <width>0</width>
            <height>0</height>
           </size>
          </property>
          <property name="maximumSize">
           <size>
            <width>16777215</width>
            <height>16777215</height>
           </size>
          </property>
          <property name="styleSheet">
           <string notr="true">selection-color: qradialgradient(spread:repeat, cx:0.5, cy:0.5, radius:0.077, fx:0.5, fy:0.5, stop:0 rgba(0, 169, 255, 147), stop:0.497326 rgba(0, 0, 0, 147), stop:1 rgba(0, 169, 255, 147));</string>
          </property>
          <property name="rootIsDecorated">
           <bool>false</bool>
          </property>
          <property name="sortingEnabled">
           <bool>true</bool>
          </property>
          <property name="animated">
           <bool>true</bool>
          </property>
          <attribute name="headerCascadingSectionResizes">
           <bool>true</bool>
          </attribute>
          <attribute name="headerDefaultSectionSize">
           <number>200</number>
          </attribute>
          <attribute name="headerShowSortIndicator" stdset="0">
           <bool>true</bool>
          </attribute>
         </widget>
        </item>
        <item>
         <widget class="QLabel" name="label_11">
          <property name="font">
           <font>
            <weight>75</weight>
            <bold>true</bold>
           </font>
          </property>
          <property name="text">
           <string>Log</string>
          </property>
         </widget>
        </item>
        <item>
         <widget class="QTextEdit" name="textEdit"/>
        </item>
        <item>
         <spacer name="verticalSpacer_4">
          <property name="orientation">
           <enum>Qt::Vertical</enum>
          </property>
          <property name="sizeHint" stdset="0">
           <size>
            <width>20</width>
            <height>40</height>
           </size>
          </property>
         </spacer>
        </item>
       </layout>
      </widget>
     </widget>
    </item>
   </layout>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>