how-to-assign-color-each-user-in-.net-maui-chat

Sample

    <ContentPage.Resources>
        <ResourceDictionary>
            <local:AuthorColorConverter x:Key="authorColorConverter"/>

            <Style TargetType="syncfusion:OutgoingMessageAuthorView">
                <Setter Property="ControlTemplate">
                    <Setter.Value>
                        <ControlTemplate x:DataType="syncfusion:TextMessage">
                            <Label Text="{Binding Author.Name}" TextColor="{TemplateBinding BindingContext, Converter= {StaticResource authorColorConverter},ConverterParameter={x:Reference viewModel}}" BindingContext="{TemplateBinding BindingContext}"/>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>

            <Style TargetType="syncfusion:IncomingMessageAuthorView">
                <Setter Property="ControlTemplate">
                    <Setter.Value>
                        <ControlTemplate x:DataType="syncfusion:TextMessage">
                            <Label Text="{Binding Author.Name}" TextColor="{TemplateBinding BindingContext, Converter= {StaticResource authorColorConverter},ConverterParameter={x:Reference viewModel}}" BindingContext="{TemplateBinding BindingContext}"/>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </ResourceDictionary>
    </ContentPage.Resources>
    
Converter:

    public class AuthorColorConverter : IValueConverter
    {
        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            if (parameter is ChatViewModel chatViewModel && value is IMessage message)
            {
                return chatViewModel.AuthorColors.TryGetValue(message.Author, out Color? color)
                    ? color ?? Colors.Black
                    : chatViewModel.AddColorForAuthor(message.Author);
            }

            return Colors.Black;
        }

        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            return Colors.Black;
        }
    }

Requirements to run the demo

To run the demo, refer to System Requirements for .NET MAUI

Troubleshooting:

Path too long exception

If you are facing path too long exception when building this example project, close Visual Studio and rename the repository to short and build the project.

License

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