ShaderBuilder class

A widget that loads and caches FragmentPrograms based on the asset key.

Usage of this widget avoids the need for a user authored stateful widget for managing the lifecycle of loading a shader. Once a shader is cached, subsequent usages of it via a ShaderBuilder will always be available synchronously. These shaders can also be precached imperatively with ShaderBuilder.precacheShader.

If the shader is not yet loaded, the provided child widget or a SizedBox is returned instead of invoking the builder callback.

Example: providing access to a FragmentShader instance.

Widget build(BuildContext context) {
 return ShaderBuilder(
   builder: (BuildContext context, ui.FragmentShader shader, Widget? child) {
     return WidgetThatUsesFragmentShader(
       shader: shader,
       child: child,
     );
   },
   child: Text('Hello, Shader'),
 );
}