WPF Listbox layout: multiple columns

Question

I have a ListBox (WPF) that contains CheckBoxes. I'm using is in a configuration screen. Schematic example below:

Now I want to add a "Test 5" CheckBox. I have limited vertical space, so I want it to appear in the horizontal direction, as shown below:

Can the ListBox layout be modified so the CheckBoxes will be arranged like this?

Answer 1

<ListBox Name="CategoryListBox"
         ScrollViewer.HorizontalScrollBarVisibility="Disabled"
         ItemsSource="{Binding Path=RefValues,
                UpdateSourceTrigger=PropertyChanged}"
                SelectionMode="Multiple">
    <ListBox.ItemsPanel>
        <ItemsPanelTemplate>
            <WrapPanel />
        </ItemsPanelTemplate>
    </ListBox.ItemsPanel>
    <ListBox.ItemTemplate>
        <DataTemplate >
            <StackPanel Orientation="Horizontal"
                        MinWidth="150" MaxWidth="150"
                        Margin="0,5, 0, 5" >
                <CheckBox
                    Name="checkedListBoxItem"
                    IsChecked="{Binding
                            RelativeSource={RelativeSource FindAncestor,
                            AncestorType={x:Type ListBoxItem} },
                            Path=IsSelected, Mode=TwoWay}" />
                <ContentPresenter
                    Content="{Binding
                            RelativeSource={RelativeSource TemplatedParent},
                            Path=Content}"
                    Margin="5,0, 0, 0" />
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

or as simple as this:

<Grid>
    <ListBox ScrollViewer.HorizontalScrollBarVisibility="Disabled">
        <ListBox.ItemsPanel>
            <ItemsPanelTemplate>
                <WrapPanel IsItemsHost="True" />
            </ItemsPanelTemplate>
        </ListBox.ItemsPanel>
        <ListBoxItem>listbox item 1</ListBoxItem>
        <ListBoxItem>listbox item 2</ListBoxItem>
        <ListBoxItem>listbox item 3</ListBoxItem>
        <ListBoxItem>listbox item 4</ListBoxItem>
        <ListBoxItem>listbox item 5</ListBoxItem>
    </ListBox>
</Grid>

Answer 2

I encountered a similar problem and eibhrum's answer gave me some idea. I used the following code and I think this also what you need. I used UniformGrid instead of WrapPanel.

<ListBox HorizontalAlignment="Stretch" 
      ItemsSource="{Binding Timers}" 
      >
   <ListBox.ItemContainerStyle>
      <Style TargetType="ListBoxItem">
         <Setter Property="HorizontalContentAlignment" Value="Stretch"></Setter>
      </Style>
   </ListBox.ItemContainerStyle>

      <ListBox.ItemsPanel>
         <ItemsPanelTemplate>
            <!-- UNIFORM GRID HERE -->
            <UniformGrid Columns="3" IsItemsHost="True" 
               HorizontalAlignment="Stretch"/>
         </ItemsPanelTemplate>
      </ListBox.ItemsPanel>

      <ListBox.ItemTemplate>
         <DataTemplate>
            <Border>
               <StackPanel Orientation="Vertical" >
                  <TextBlock Text="{Binding Label}" TextWrapping="Wrap"/>
                  <Separator Margin="5,0,10,0"/>
               </StackPanel>
            </Border>
         </DataTemplate>
      </ListBox.ItemTemplate>

   </ListBox>