CODEWITHSUNDEEP
c#wpf
Nicke Manarin
Nicke Manarin

Reputation: 3360

Temporarily hiding/removing ComboBox items

I have a ComboBox that displays some objects by using this simplified template:

<DataTemplate x:Key="ComboBoxDataTemplate">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
   
        <TextBlock Grid.Row="0" Text="{Binding Title}" Margin="10,0,2,0" VerticalAlignment="Center"/>
        <TextBlock Grid.Row="1" Text="{Binding Description}" Margin="10,0,2,0" 
                   TextTrimming="CharacterEllipsis" FontSize="11" VerticalAlignment="Center"/>
    </Grid>
</DataTemplate>

The ComboBox has predefined items (they extend from FrameworkElement), but depending on other parameters, I need to hide some of these items.

<ComboBox VerticalAlignment="Center" Margin="10,3,5,3" Height="38" ItemTemplate="{StaticResource ComboBoxDataTemplate}">
    <i:GenericItem x:Name="SomethingItem" Title="Something" Description="Abc" Value="{x:Static u:MyEnum.Something}"/>

    <i:GenericItem x:Name="ElseItem" Title="Else" Description="Def" Value="{x:Static u:MyEnum.Else}"/>

    <i:GenericItem x:Name="GoesItem" Title="Goes" Description="Ghj" Value="{x:Static u:MyEnum.Goes}"/>

    <i:GenericItem x:Name="HereItem" Title="Here" Description="Ijk" Value="{x:Static u:MyEnum.Here}"/>
</ComboBox>

I'm wondering if there's a simple way, like setting IsEnabled, to hide these items?

Without having to add/remove the items from the ComboBox.

Upvotes: 1

Views: 38

Answers (1)

mm8
mm8

Reputation: 169370

You could define an ItemContainerStyle that sets the Visibility property of the ComboBoxItem container to Collapsed based on some property value of a GenericItem, e.g.:

<ComboBox VerticalAlignment="Center" Margin="10,3,5,3" Height="38" ItemTemplate="{StaticResource ComboBoxDataTemplate}">
    <ComboBox.ItemContainerStyle>
        <Style TargetType="ComboBoxItem">
            <Style.Triggers>
                <DataTrigger Binding="{Binding IsEnabled}" Value="False">
                    <Setter Property="Visibility" Value="Collapsed"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </ComboBox.ItemContainerStyle>

    <i:GenericItem x:Name="SomethingItem" Title="Something" Description="Abc" Value="{x:Static u:MyEnum.Something}"/>

    <i:GenericItem x:Name="ElseItem" Title="Else" Description="Def" Value="{x:Static u:MyEnum.Else}"/>

    <i:GenericItem x:Name="GoesItem" Title="Goes" Description="Ghj" Value="{x:Static u:MyEnum.Goes}"/>

    <i:GenericItem x:Name="HereItem" Title="Here" Description="Ijk" Value="{x:Static u:MyEnum.Here}"/>
</ComboBox>

The above sample markup should hide any item that gets disabled.

Upvotes: 1

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