CODEWITHSUNDEEP
c#wpf
Nathanael
Nathanael

Reputation: 1772

How can I change the colour of selected text in a WPF ComboBox?

In my application, I have defined the following style for TextBlocks.

<Style TargetType="{x:Type TextBlock}">
    <Setter Property="FontFamily" Value="Arial"/>
    <Setter Property="FontSize" Value="11"/>
    <Setter Property="Foreground" Value="{StaticResource TextBrush}"/>
    <Setter Property="Opacity" Value="1.0"/>
    <Style.Triggers>
        <Trigger Property="IsEnabled" Value="false">
            <Setter Property="Opacity" Value="0.40"/>
        </Trigger>
    </Style.Triggers>
</Style>

The style is intentionally defined at the highest level of my application so that it applies to all TextBlocks by default.

The problem is that this style breaks the behaviour of TextBlocks in ComboBoxes. Normally, the selected item in a ComboBox has its Foreground colour change to white. With this style applied however, the foreground colour of the text does not change.

How can I trigger the text to change colour when the TextBlock in a ComboBox is highlighted?

Upvotes: 2

Views: 5628

Answers (3)

Nathanael
Nathanael

Reputation: 1772

I resolved this issue by moving the styles out of app.xaml and into a separate resource dictionary that I include as needed in my application Window & Pages.

This stops the TextBlock style from affecting the colour of the text in the ComboBox. Finally, to achieve the text colour I wanted on all items I overrode the following default system colours with my own.

<SolidColorBrush x:Key="{x:Static SystemColors.ControlTextBrushKey}"
                 Color="{StaticResource TextColor}"/>

<SolidColorBrush x:Key="{x:Static SystemColors.WindowTextBrushKey}"
                 Color="{StaticResource TextColor}"/>

Upvotes: 1

Rohit Vats
Rohit Vats

Reputation: 81313

If you just want to change the texblock foreground for selected item(say Red), just add this to your style resources:

<Style.Resources>
    <SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}" Color="Red"/>
</Style.Resources>

Upvotes: 2

IVerzin
IVerzin

Reputation: 888

You can add second style based on your first and reset background property.

<Style TargetType="{x:Type TextBlock}">
    <Setter Property="Foreground" Value="{StaticResource TextBrush}"/>
</Style>

<Style TargetType="{x:Type TextBlock}" BasedOn="{StaticResource {x:Type TextBlock}}" x:Key="ResetBG">
    <Setter Property="Foreground" Value="{Binding Control.Background}"/>
</Style>

<TextBlock Text="Red"/>
<TextBlock Text="Default" Style="{StaticResource ResourceKey=ResetBG}"/>

Upvotes: 0

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