Setting the Focused Background Color of a MaskedEntry Control on Windows

Environment

Property	Value
Product	MaskedEntry for .NET MAUI
Version	6.6.0

Description

I want to set the background color for the focused state of a MaskedEntry control on Windows in my .NET MAUI application. By default, when I tab into the control, the focused background color reverts to white even after setting the background color to black. Changing the background using the 'Focused' visual state does not work either.

Solution

To set the background color for the focused state of the MaskedEntry control on Windows in a .NET MAUI application, follow these steps:

1. Create a custom ResourceDictionary that contains the desired adjustments for the visual states.
2. Merge this ResourceDictionary in the Platforms/Windows/App.xaml file.

Here is an example:

1. Create a new file named CustomStyles.xaml in the Platforms/Windows folder of your .NET MAUI application.

2. Add the following XAML code to the CustomStyles.xaml file:

<ResourceDictionary xmlns="http://xamarin.com/schemas/2014/forms"
                    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">
    <Style TargetType="TextBox">
        <Setter Property="Background" Value="Black" />
        <Setter Property="BorderBrush" Value="Black" />
        <Setter Property="Foreground" Value="White" />
        <Setter Property="Padding" Value="5" />
    </Style>
    <Style TargetType="TextBox" x:Key="FocusVisualStyle">
        <Setter Property="Background" Value="Black" />
        <Setter Property="Foreground" Value="White" />
    </Style>
</ResourceDictionary>

3. Open the Platforms/Windows/App.xaml file and add the following line inside the ResourceDictionary section:

    <maui:MauiWinUIApplication.Resources>
        <ResourceDictionary>
            <!--Replace the resources of Telerik-->
            <ResourceDictionary.ThemeDictionaries>
                <ResourceDictionary x:Key="Default">
                    <winui:UserThemeResources x:Key="ResourceLoaderInitializer"
                                              LightResourcesPath="ms-appx:///Platforms/Windows/CustomStyles.xaml"/>
                </ResourceDictionary>
            </ResourceDictionary.ThemeDictionaries>
        </ResourceDictionary>
    </maui:MauiWinUIApplication.Resources>

4. Save the changes and rebuild your .NET MAUI application.

Now, when you tab into the MaskedEntry control on Windows, the focused background color will be set to black.

Notes

• By creating a custom ResourceDictionary and merging it in the Platforms/Windows/App.xaml file, you can override the default visual states of the MaskedEntry control and customize its appearance on Windows.
• Make sure to adjust the background color values in the CustomStyles.xaml file according to your desired color scheme.

See Also

• Customizing the Visual Appearance of Controls in .NET MAUI