yogurt_editor 0.0.1

A flexible editor create and manipulate diagrams programmatically. Easily generate, customize, and visualize diagrams within your applications.

Features

Custom your diagrams editor.

Getting started

To start using the library, add the following dependency to your pubspec.yaml file:

dependencies:
  yogurt_editor: any

Usage

import 'dart:ui' as ui;

import 'package:flutter/material.dart';
import 'package:yogurt_editor/yogurt_editor.dart';

void main() {
  runApp(const MainApp());
}

class MainApp extends StatelessWidget {
  const MainApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: Scaffold(
        body: Example(),
      ),
    );
  }
}

class Example extends StatefulWidget {
  const Example({super.key});

  @override
  State<Example> createState() => _ExampleState();
}

class _ExampleState extends State<Example> {
  late final EditorController controller;

  static int _nextId = 0;

  static int _id() => _nextId++;

  @override
  void initState() {
    super.initState();
    controller = EditorController(
      root: CellState(
        id: _id(),
        model: CustomCellModel(
          builder: (context, state) {
            return const SizedBox();
          },
        ),
      ),
    );

    controller.create(CellState(
      id: _id(),
      model: const NodeModel(),
      all: const {
        Bounds: Bounds.fixed(
          left: 100,
          top: 100,
          width: 100,
          height: 100,
        ),
      },
    ));

    controller.create(CellState(
      id: _id(),
      model: const NodeModel(),
      all: const {
        Bounds: Bounds.fixed(
          left: 250,
          top: 150,
          width: 100,
          height: 100,
        ),
      },
    ));

    controller.create(
      CellState(
        id: _id(),
        model: const NodeModel(),
        all: const {
          String: 'inner text',
          Bounds: Bounds.intrinsic(
            top: 300,
            left: 300,
            delegate: IntrinsicBounds(),
          ),
        },
      ),
      extraPlugins: [
        const IntrinsicBoundsPlugin(
          delegate: IntrinsicBounds(),
        )
      ],
    );
  }

  @override
  void dispose() {
    controller.close();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return EditorView(
      controller: controller,
    );
  }
}

class NodeModel extends CellModelBase {
  const NodeModel();

  @override
  List<CellPluginBase> get plugins => const [
        BoundsPlugin(),
        DragPlugin(),
        DropPlugin(),
      ];

  @override
  Widget build(BuildContext context, CellState state) {
    return ColoredBox(
      color: Colors.blue,
      child: state.has<String>() ? Text(state()) : null,
    );
  }
}

class IntrinsicBounds extends IntrinsicBoundsDelegate {
  const IntrinsicBounds();

  @override
  Size computeDryLayout(CellController controller) {
    final builder = ui.ParagraphBuilder(ui.ParagraphStyle(
      fontSize: 14,
    ));

    builder.pushStyle(ui.TextStyle());
    builder.addText(controller.state<String>());

    final paragraph = builder.build();

    paragraph.layout(const ui.ParagraphConstraints(
      width: 120,
    ));

    return Size(paragraph.width, paragraph.height);
  }
}