Flutter: How to hide or show more text within certain length

Question

My Container having a description about movies.

Initially i want to show only few lines of description. And below to that there should be a link (more...

Answer 1

Try this.

Watch the output from here ( Video )

or refer below images

import 'package:flutter/material.dart';

class DemoPage extends StatefulWidget {
  final Widget child;

  DemoPage({Key key, this.child}) : super(key: key);

  _DemoPageState createState() => _DemoPageState();
}

class _DemoPageState extends State {

String descText = "Description Line 1\nDescription Line 2\nDescription Line 3\nDescription Line 4\nDescription Line 5\nDescription Line 6\nDescription Line 7\nDescription Line 8";
bool descTextShowFlag = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("DemoPage"),
      ),
      body: new Container(
        margin: EdgeInsets.all(16.0),
        child: new Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
              Text(descText,
                maxLines: descTextShowFlag ? 8 : 2,textAlign: TextAlign.start),
              InkWell(
                onTap: (){ setState(() {
                descTextShowFlag = !descTextShowFlag; 
                }); },
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.end,
                  children: [
                    descTextShowFlag ? Text("Show Less",style: TextStyle(color: Colors.blue),) :  Text("Show More",style: TextStyle(color: Colors.blue))
                  ],
                ),
              ),
          ],
        ),
      ),
    );
  }
}