rich_editor/example/lib/basic.dart

import 'dart:convert';

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

class BasicDemo extends StatelessWidget {
  final GlobalKey<RichEditorState> keyEditor = GlobalKey();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Basic Demo'),
        actions: [
          PopupMenuButton(
            child: IconButton(
              icon: Icon(Icons.more_vert),
              onPressed: null,
              disabledColor: Colors.white,
            ),
            itemBuilder: (context) {
              return [
                PopupMenuItem(
                  child: Text('Get HTML'),
                  value: 0,
                ),
                PopupMenuItem(
                  child: Text('Clear content'),
                  value: 1,
                ),
                PopupMenuItem(
                  child: Text('Hide keyboard'),
                  value: 2,
                ),
                PopupMenuItem(
                  child: Text('Show Keyboard'),
                  value: 3,
                ),
              ];
            },
            onSelected: (val) async {
              switch (val) {
                case 0:
                  String? html = await keyEditor.currentState?.getHtml();
                  print(html);
                  break;
                case 1:
                  await keyEditor.currentState?.clear();
                  break;
                case 2:
                  await keyEditor.currentState?.unFocus();
                  break;
                case 3:
                  await keyEditor.currentState?.focus();
                  break;
              }
            },
          ),
        ],
      ),
      body: RichEditor(
        key: keyEditor,
        value: '''
        Hello, This is a rich text Editor for Flutter. It supports most things like Bold, italics and underline.
        As well as Subscript, Superscript, Colored text, Colors bg text and hyperlink.
        Images and Videos are also supports
        ''', // initial HTML data
        editorOptions: RichEditorOptions(
          placeholder: 'Start typing',
          // backgroundColor: Colors.blueGrey, // Editor's bg color
          // baseTextColor: Colors.white,
          // editor padding
          padding: EdgeInsets.symmetric(horizontal: 5.0),
          // font name
          baseFontFamily: 'sans-serif',
          // Position of the editing bar (BarPosition.TOP or BarPosition.BOTTOM)
          barPosition: BarPosition.TOP,
        ),

        // You can return a Link (maybe you need to upload the image to your
        // storage before displaying in the editor or you can also use base64
        getImageUrl: (image) {
          String base64 = base64Encode(image.readAsBytesSync());
          String base64String = 'data:image/png;base64, $base64';
          return base64String;
        },
        getVideoUrl: (video) {
          String link = 'https://file-examples-com.github.io/uploads/2017/'
              '04/file_example_MP4_480_1_5MG.mp4';
          return link;
        },
      ),
    );
  }
}