qt - Why does enabling word wrap for a QLabel alter the layout? -

so have small program i've made qt designer, , part, it's fine. there 1 niggling problem;

i have qlabel, text long, want make text wrap. should simple task.

here looks no wordwrap

and fine. when text gets long, puts in horrible scroll bar. don't want this, enable wordwrap. happens:

which @ first thought qt designer being crap, compiled , run hoping go away. happens, thought reasonable assumption.

it wasn't.

why hell happening?!

edit: enabling word wrap manually in widget initialiser causes same behaviour - it's not caused qt designer, it's issue elsewhere. appreciated!

here content of ui 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>705</width>     <height>347</height>    </rect>   </property>   <property name="windowtitle">    <string>title</string>   </property>   <property name="windowicon">    <iconset resource="icons.qrc">     <normaloff>:/icons/icons/3/bonus48x48_20.png</normaloff>:/icons/icons/3/bonus48x48_20.png</iconset>   </property>   <widget class="qwidget" name="centralwidget">    <layout class="qgridlayout" name="gridlayout" columnstretch="0,1,1">     <item row="1" column="0">      <widget class="qlabel" name="label_molecule">       <property name="text">        <string>molecule:</string>       </property>      </widget>     </item>     <item row="1" column="1">      <widget class="qlineedit" name="lineedit_molecule"/>     </item>     <item row="2" column="0" colspan="2">      <widget class="qtoolbox" name="toolbox_modeldetails">       <property name="currentindex">        <number>0</number>       </property>       <widget class="qwidget" name="page_isomer">        <property name="geometry">         <rect>          <x>0</x>          <y>0</y>          <width>373</width>          <height>154</height>         </rect>        </property>        <attribute name="label">         <string>isomer</string>        </attribute>        <layout class="qvboxlayout" name="verticallayout">         <item>          <widget class="qlistwidget" name="listwidget_isomers">           <property name="alternatingrowcolors">            <bool>true</bool>           </property>          </widget>         </item>        </layout>       </widget>       <widget class="qwidget" name="page_model">        <property name="geometry">         <rect>          <x>0</x>          <y>0</y>          <width>357</width>          <height>231</height>         </rect>        </property>        <attribute name="label">         <string>model</string>        </attribute>        <layout class="qvboxlayout" name="verticallayout_2" stretch="0,0">         <item>          <widget class="qlistwidget" name="listwidget_models">           <property name="sizepolicy">            <sizepolicy hsizetype="expanding" vsizetype="expanding">             <horstretch>0</horstretch>             <verstretch>0</verstretch>            </sizepolicy>           </property>           <property name="font">            <font>             <stylestrategy>preferdefault</stylestrategy>            </font>           </property>           <property name="linewidth">            <number>1</number>           </property>           <property name="alternatingrowcolors">            <bool>true</bool>           </property>          </widget>         </item>         <item>          <widget class="qlabel" name="label_description">           <property name="text">            <string>howdy!</string>           </property>           <property name="wordwrap">            <bool>true</bool>           </property>          </widget>         </item>        </layout>       </widget>       <widget class="qwidget" name="page_basisset">        <property name="geometry">         <rect>          <x>0</x>          <y>0</y>          <width>373</width>          <height>154</height>         </rect>        </property>        <attribute name="label">         <string>basis set</string>        </attribute>        <layout class="qvboxlayout" name="verticallayout_3">         <item>          <widget class="qlistwidget" name="listwidget_basissets">           <property name="alternatingrowcolors">            <bool>true</bool>           </property>          </widget>         </item>        </layout>       </widget>      </widget>     </item>     <item row="3" column="0" colspan="3">      <layout class="qhboxlayout" name="horizontallayout_buttons">       <item>        <spacer name="horizontalspacer_buttons">         <property name="orientation">          <enum>qt::horizontal</enum>         </property>         <property name="sizehint" stdset="0">          <size>           <width>40</width>           <height>20</height>          </size>         </property>        </spacer>       </item>       <item>        <widget class="qpushbutton" name="pushbutton_save">         <property name="text">          <string>save input file</string>         </property>        </widget>       </item>       <item>        <widget class="qpushbutton" name="pushbutton_open">         <property name="text">          <string>open</string>         </property>        </widget>       </item>      </layout>     </item>     <item row="1" column="2" rowspan="2">      <widget class="qgroupbox" name="groupbox_moleculeviewer">       <property name="title">        <string>molecule</string>       </property>      </widget>     </item>    </layout>   </widget>   <widget class="qstatusbar" name="statusbar"/>  </widget>  <resources>   <include location="icons.qrc"/>  </resources>  <connections/> </ui> 

why nesting widgets (the qlabel , qlistwidget) qwidget?

that's why getting 2 scrollbars. 1 qlistwidget, because has more items can viewed. , 1 parent qwidget.

you should using layouts.

this have:

should this: