Add "Tool Panel Factory" - flutter example.

[ilopX]

Abstract Factory Pattern

Abstract Factory is a creational design pattern that lets you produce families of related objects
without specifying their concrete classes.

Tutorial: here.

Online demo:

Click on the picture to see the demo.

Diagram:

Client code (using the "createShape" method):

final app = App(
  tools: Tools(
    factories: [
      TxtFactory(),
      LineFactory(),
      CircleFactory(),
      TriangleFactory(),
      StarFactory(),
    ],
  ),
);

class App {
  void addShape(double x, double y) {
    final newShape = activeFactory.createShape(x, y, activeColor);
    shapes.add(newShape);
  }
}

mixin IconBoxMixin implements FactoryTool {
  Image? _icon;

  @override
  Image get icon => _icon!;

  Future<void> updateIcon(Color color) async {
    final shape = createShape(0, 0, color);
    final pngBytes = await _pngImageFromShape(shape);
    _icon = Image.memory(pngBytes);
  }
}