Simple adder UI

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainDialog</class>
 <widget class="QDialog" name="MainDialog">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>275</width>
    <height>105</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Calculator</string>
  </property>
  <layout class="QHBoxLayout" name="horizontalLayout">
   <item>
    <widget class="QWidget" name="widget" native="true">
     <layout class="QFormLayout" name="formLayout">
      <property name="fieldGrowthPolicy">
       <enum>QFormLayout::ExpandingFieldsGrow</enum>
      </property>
      <item row="0" column="0">
       <widget class="QLabel" name="aLabel">
        <property name="text">
         <string>A</string>
        </property>
       </widget>
      </item>
      <item row="0" column="1">
       <widget class="QLineEdit" name="aLineEdit"/>
      </item>
      <item row="1" column="0">
       <widget class="QLabel" name="bLabel">
        <property name="text">
         <string>B</string>
        </property>
       </widget>
      </item>
      <item row="1" column="1">
       <widget class="QLineEdit" name="bLineEdit"/>
      </item>
      <item row="2" column="0">
       <widget class="QLabel" name="resultLabel">
        <property name="text">
         <string>Result</string>
        </property>
       </widget>
      </item>
      <item row="2" column="1">
       <widget class="QLineEdit" name="resultLineEdit"/>
      </item>
     </layout>
    </widget>
   </item>
   <item>
    <widget class="QWidget" name="widget_2" native="true">
     <layout class="QVBoxLayout" name="verticalLayout">
      <item>
       <widget class="QPushButton" name="calculateButton">
        <property name="text">
         <string>Calculate</string>
        </property>
        <property name="default">
         <bool>true</bool>
        </property>
       </widget>
      </item>
      <item>
       <widget class="QPushButton" name="clearButton">
        <property name="text">
         <string>Clear</string>
        </property>
       </widget>
      </item>
      <item>
       <spacer name="closeButtonSpacer">
        <property name="orientation">
         <enum>Qt::Vertical</enum>
        </property>
        <property name="sizeHint" stdset="0">
         <size>
          <width>20</width>
          <height>5</height>
         </size>
        </property>
       </spacer>
      </item>
      <item>
       <widget class="QPushButton" name="closeButton">
        <property name="text">
         <string>Close</string>
        </property>
       </widget>
      </item>
     </layout>
    </widget>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections>
  <connection>
   <sender>closeButton</sender>
   <signal>clicked()</signal>
   <receiver>MainDialog</receiver>
   <slot>close()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>227</x>
     <y>84</y>
    </hint>
    <hint type="destinationlabel">
     <x>137</x>
     <y>52</y>
    </hint>
   </hints>
  </connection>
  <connection>
   <sender>clearButton</sender>
   <signal>clicked()</signal>
   <receiver>aLineEdit</receiver>
   <slot>clear()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>227</x>
     <y>47</y>
    </hint>
    <hint type="destinationlabel">
     <x>112</x>
     <y>19</y>
    </hint>
   </hints>
  </connection>
  <connection>
   <sender>clearButton</sender>
   <signal>clicked()</signal>
   <receiver>bLineEdit</receiver>
   <slot>clear()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>227</x>
     <y>47</y>
    </hint>
    <hint type="destinationlabel">
     <x>112</x>
     <y>46</y>
    </hint>
   </hints>
  </connection>
  <connection>
   <sender>clearButton</sender>
   <signal>clicked()</signal>
   <receiver>resultLineEdit</receiver>
   <slot>clear()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>227</x>
     <y>47</y>
    </hint>
    <hint type="destinationlabel">
     <x>112</x>
     <y>73</y>
    </hint>
   </hints>
  </connection>
 </connections>
</ui>