How to set the "Classes" for ListboxItem

[cboittin]

I want to customize how the selected ListBoxItems are displayed, but i want to do it for a specific ListBox, and from another file (or even another DLL).

I have a Style created for my ListBoxItem, the question is : how do i apply it ?

<Style Selector="ListBoxItem.FrameMenu">
  <Setter Property="Theme" Value="{DynamicResource ListBoxItem.FrameMenu}"/>
</Style>

For any other control i can just set "Classes" to whatever i want, but i don't see a way to do that for the ListBoxItems of my ListBox. All i can do is define it globally for all listboxes, or create the style inside my listbox, in which case i can't override it later.

Am i missing something ?
Perhaps ItemsControl should have a property "ItemsClasses" for this behavior ?

[cboittin]

Nevermind ! I was indeed missing something, there is a way to do it:

  <Style Selector="ListBox.FrameMenu > ListBoxItem">
    <Setter Property="Theme" Value="{DynamicResource ListBoxItem.FrameMenu}"/>
  </Style>

[Mumrikken]

Could you provide the complete example? I cant get this to work...

[cboittin]

I can add some bits.

In my Resources.axaml, i have the control template for my ListBoxItem:

  <ControlTheme x:Key="ListBoxItem.FrameMenu" TargetType="ListBoxItem">
    <Setter Property="Padding" Value="5" />
    <Setter Property="Template">
      <ControlTemplate>
        <Border Name="PART_Border" CornerRadius="10" Background="{TemplateBinding Background}">
          <ContentPresenter Name="PART_ContentPresenter"
                            Background="Transparent"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}"
                            CornerRadius="{TemplateBinding CornerRadius}"
                            ContentTemplate="{TemplateBinding ContentTemplate}"
                            Content="{TemplateBinding Content}"
                            Padding="{TemplateBinding Padding}"
                            VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
                            HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"/>
        </Border>
      </ControlTemplate>
    </Setter>
    
    <Style Selector="^:selected /template/ Border#PART_Border">
      <Setter Property="Background" Value="LightGray" />
    </Style>
  </ControlTheme>

In my styles.axaml, i have

  <Style Selector="ListBox.FrameMenu > ListBoxItem">
    <Setter Property="Theme" Value="{DynamicResource ListBoxItem.FrameMenu}"/>
  </Style>

Then, in my component, i just need to set the class for my ListBox, and it'll use the ListBoxItem template i defined.

<ListBox ItemsSource="{Binding MyItems}" SelectionMode="Single" Classes="FrameMenu"/>