Gesture detection in Flutter TextSpan

问题

Is there a way to detect which word in the TextSpan was touched by the user?

This paragraph is here to get round the stack overflow robot that is insisting that I write more stuff :)

回答1:

You can improve by yourself

import 'package:flutter/gestures.dart';
...

new RichText(
      text: new TextSpan(text: 'Non touchable. ', children: [
        new TextSpan(
          text: 'Tap here.',
          recognizer: new TapGestureRecognizer()..onTap = () => print('Tap Here onTap'),
        )
      ]),
    );

回答2:

You can use recognizer property of TextSpan which allows almost every type of event. Here is a basic implementation.

import 'package:flutter/gestures.dart';

//... Following goes in StatefulWidget subclass

TapGestureRecognizer _recognizer1;
DoubleTapGestureRecognizer _recognizer2;
LongPressGestureRecognizer _recognizer3;

@override
void initState() {
  super.initState();
  _recognizer1 = TapGestureRecognizer()
    ..onTap = () {
      print("tapped");
    };
  _recognizer2 = DoubleTapGestureRecognizer()
    ..onDoubleTap = () {
      print("double tapped");
    };
  _recognizer3 = LongPressGestureRecognizer()
    ..onLongPress = () {
      print("long pressed");
    };
}

@override
Widget build(BuildContext context) {
  var underlineStyle = TextStyle(decoration: TextDecoration.underline, color: Colors.black, fontSize: 16);

  return Scaffold(
    appBar: AppBar(title: Text("TextSpan")),
    body: RichText(
      text: TextSpan(
        text: 'This is going to be a text which has ',
        style: underlineStyle.copyWith(decoration: TextDecoration.none),
        children: <TextSpan>[
          TextSpan(text: 'single tap ', style: underlineStyle, recognizer: _recognizer1),
          TextSpan(text: 'along with '),
          TextSpan(text: 'double tap ', style: underlineStyle, recognizer: _recognizer2),
          TextSpan(text: 'and '),
          TextSpan(text: 'long press', style: underlineStyle, recognizer: _recognizer3),
        ],
      ),
    ),
  );
}

来源：https://stackoverflow.com/questions/48914775/gesture-detection-in-flutter-textspan

标签

gesture

Flutter