mainwindow.ui Example File

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>713</width>
    <height>455</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>StyleSheet Browser</string>
  </property>
  <property name="unifiedTitleAndToolBarOnMac">
   <bool>false</bool>
  </property>
  <widget class="QWidget" name="centralWidget">
   <layout class="QHBoxLayout" name="horizontalLayout">
    <property name="spacing">
     <number>0</number>
    </property>
    <property name="leftMargin">
     <number>0</number>
    </property>
    <property name="topMargin">
     <number>0</number>
    </property>
    <property name="rightMargin">
     <number>0</number>
    </property>
    <property name="bottomMargin">
     <number>0</number>
    </property>
    <item>
     <widget class="QWidget" name="webContentsWidget" native="true">
      <layout class="QVBoxLayout" name="verticalLayout_3">
       <property name="spacing">
        <number>0</number>
       </property>
       <property name="leftMargin">
        <number>0</number>
       </property>
       <property name="topMargin">
        <number>0</number>
       </property>
       <property name="rightMargin">
        <number>0</number>
       </property>
       <property name="bottomMargin">
        <number>0</number>
       </property>
       <item>
        <widget class="QWidget" name="urlBarWidget" native="true">
         <property name="sizePolicy">
          <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
           <horstretch>0</horstretch>
           <verstretch>0</verstretch>
          </sizepolicy>
         </property>
         <layout class="QHBoxLayout" name="horizontalLayout_2">
          <item>
           <widget class="QLineEdit" name="urlBar"/>
          </item>
          <item>
           <widget class="QPushButton" name="reloadButton">
            <property name="text">
             <string/>
            </property>
            <property name="icon">
             <iconset resource="stylesheetbrowser.qrc">
              <normaloff>:/view-refresh.png</normaloff>:/view-refresh.png</iconset>
            </property>
            <property name="shortcut">
             <string>Ctrl+R</string>
            </property>
           </widget>
          </item>
          <item>
           <widget class="QPushButton" name="settingsButton">
            <property name="text">
             <string>Settings</string>
            </property>
           </widget>
          </item>
         </layout>
        </widget>
       </item>
       <item>
        <widget class="QWebEngineView" name="webEngineView" native="true">
         <property name="sizePolicy">
          <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
           <horstretch>0</horstretch>
           <verstretch>0</verstretch>
          </sizepolicy>
         </property>
         <property name="url" stdset="0">
          <url>
           <string>about:blank</string>
          </url>
         </property>
        </widget>
       </item>
      </layout>
     </widget>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menuBar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>713</width>
     <height>20</height>
    </rect>
   </property>
  </widget>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <customwidgets>
  <customwidget>
   <class>QWebEngineView</class>
   <extends>QWidget</extends>
   <header location="global">QtWebEngineWidgets/QWebEngineView</header>
  </customwidget>
 </customwidgets>
 <resources>
  <include location="stylesheetbrowser.qrc"/>
 </resources>
 <connections/>
</ui>