previewer.ui Example File
webkit/previewer/previewer.ui

 <ui version="4.0" >
  <class>Form</class>
  <widget class="QWidget" name="Form" >
   <property name="geometry" >
    <rect>
     <x>0</x>
     <y>0</y>
     <width>911</width>
     <height>688</height>
    </rect>
   </property>
   <property name="windowTitle" >
    <string>Form</string>
   </property>
   <layout class="QHBoxLayout" name="horizontalLayout_4" >
    <item>
     <widget class="QSplitter" name="splitter" >
      <property name="orientation" >
       <enum>Qt::Horizontal</enum>
      </property>
      <widget class="QGroupBox" name="editorBox" >
       <property name="title" >
        <string>HTML Editor</string>
       </property>
       <layout class="QHBoxLayout" name="horizontalLayout_2" >
        <item>
         <layout class="QVBoxLayout" name="verticalLayout_2" >
          <item>
           <widget class="QPlainTextEdit" name="plainTextEdit" />
          </item>
          <item>
           <layout class="QHBoxLayout" name="horizontalLayout" >
            <item>
             <widget class="QPushButton" name="clearButton" >
              <property name="text" >
               <string>Clear</string>
              </property>
             </widget>
            </item>
            <item>
             <widget class="QPushButton" name="previewButton" >
              <property name="text" >
               <string>Preview</string>
              </property>
             </widget>
            </item>
           </layout>
          </item>
         </layout>
        </item>
       </layout>
      </widget>
      <widget class="QGroupBox" name="previewerBox" >
       <property name="title" >
        <string>HTML Preview</string>
       </property>
       <layout class="QHBoxLayout" name="horizontalLayout_3" >
        <item>
         <widget class="QWebView" name="webView" >
          <property name="url" >
           <url>
            <string>about:blank</string>
           </url>
          </property>
         </widget>
        </item>
       </layout>
      </widget>
     </widget>
    </item>
   </layout>
  </widget>
  <customwidgets>
   <customwidget>
    <class>QWebView</class>
    <extends>QWidget</extends>
    <header>QtWebKit/QWebView</header>
   </customwidget>
  </customwidgets>
  <resources/>
  <connections>
   <connection>
    <sender>clearButton</sender>
    <signal>clicked()</signal>
    <receiver>plainTextEdit</receiver>
    <slot>clear()</slot>
    <hints>
     <hint type="sourcelabel" >
      <x>56</x>
      <y>653</y>
     </hint>
     <hint type="destinationlabel" >
      <x>98</x>
      <y>551</y>
     </hint>
    </hints>
   </connection>
  </connections>
 </ui>