awesome-uiwidgets/AwesomeUIWidgets/Assets/Scripts/Widgets/inherited_theme.cs

using Unity.UIWidgets.foundation;
using Unity.UIWidgets.widgets;

namespace UIWidgetsSample
{
    internal class InheritedChatTheme : InheritedWidget
    {
        /// Represents chat theme
        public readonly ChatTheme theme;

        /// Creates [InheritedWidget] from a provided [ChatTheme] class
        public InheritedChatTheme(
            ChatTheme theme,
            Widget child,
            Key key = null
        ) : base(key, child)
        {
            this.theme = theme;
        }

        public static InheritedChatTheme of(BuildContext context)
        {
            return context.dependOnInheritedWidgetOfExactType<InheritedChatTheme>();
        }


        public override bool updateShouldNotify(InheritedWidget oldWidget)
        {
            var result = theme.GetHashCode() != ((InheritedChatTheme) oldWidget).theme.GetHashCode();
            return result;
        }
    }
}