Swipe List Item for more options (Flutter)

Question

Somedays ago I decided to choose an Ui for an app from Pinterest to practice building apps with Flutter but I\'m stuck with the Slider which shows an \"more\" and \"delete\"

Answer 1

Padding(
        padding: const EdgeInsets.all(8.0),
        child: ListView.builder(
            itemCount: the_length_of_your_items,
            itemBuilder: (BuildContext context,int index) {
              return Slidable(
                actionPane: SlidableDrawerActionPane(),
                actionExtentRatio: 0.25,
                child: Container(
                  color: Colors.white,
                  child: ListTile(
                    leading: Text(('the_leading')),
                    title: Text(('the_title')),
                    trailing: Text(('the_trailing')),
                    subtitle: Text(('the_subtitle')),
                  ),
                ),
                actions: <Widget>[
                  IconSlideAction(
                     caption: 'Archive',
                    color: Colors.blue,
                    icon: Icons.archive,
                    onTap: () {print('archive');},
                  ),
                  IconSlideAction(
                    caption: 'Share',
                    color: Colors.indigo,
                    icon: Icons.share,
                    onTap: () {print('share');},
                  ),
                ],
                secondaryActions: <Widget>[
                  IconSlideAction(
                    caption: 'More',
                    color: Colors.black45,
                    icon: Icons.more_horiz,
                    onTap: ()  {print('more');},
                  ),
                  IconSlideAction(
                    caption: 'Delete',
                    color: Colors.red,
                    icon: Icons.delete,
                    onTap: () {print('delete');},
                  ),
                ],
              );
            }),
      ),

Answer 2

I have a task that needs the same swipeable menu actions I tried answeres of Romain Rastel and Rémi Rousselet. but I have complex widget tree. the issue with that slideable solutions is they go on other widgets(to left widgets of listview). I found a batter solution here someone wrote a nice article medium and GitHub sample is here.

Answer 3

I created a package for doing this kind of layout: flutter_slidable (Thanks Rémi Rousselet for the based idea)

With this package it's easier to create contextual actions for a list item. For example if you want to create the kind of animation you described:

You will use this code:

new Slidable(
  delegate: new SlidableDrawerDelegate(),
  actionExtentRatio: 0.25,
  child: new Container(
    color: Colors.white,
    child: new ListTile(
      leading: new CircleAvatar(
        backgroundColor: Colors.indigoAccent,
        child: new Text('$3'),
        foregroundColor: Colors.white,
      ),
      title: new Text('Tile n°$3'),
      subtitle: new Text('SlidableDrawerDelegate'),
    ),
  ),
  actions: <Widget>[
    new IconSlideAction(
      caption: 'Archive',
      color: Colors.blue,
      icon: Icons.archive,
      onTap: () => _showSnackBar('Archive'),
    ),
    new IconSlideAction(
      caption: 'Share',
      color: Colors.indigo,
      icon: Icons.share,
      onTap: () => _showSnackBar('Share'),
    ),
  ],
  secondaryActions: <Widget>[
    new IconSlideAction(
      caption: 'More',
      color: Colors.black45,
      icon: Icons.more_horiz,
      onTap: () => _showSnackBar('More'),
    ),
    new IconSlideAction(
      caption: 'Delete',
      color: Colors.red,
      icon: Icons.delete,
      onTap: () => _showSnackBar('Delete'),
    ),
  ],
);

Answer 4

There's already a widget for this kind of gesture. It's called Dismissible.

You can find it here. https://docs.flutter.io/flutter/widgets/Dismissible-class.html

EDIT

If you need the exact same transtion, you'd probably have to implement if yourself. I made a basic example. You'd probably want to tweak the animation a bit, but it's working at least.

class Test extends StatefulWidget {
  @override
  _TestState createState() => new _TestState();
}

class _TestState extends State<Test> {
  double rating = 3.5;

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new ListView(
        children: ListTile
            .divideTiles(
              context: context,
              tiles: new List.generate(42, (index) {
                return new SlideMenu(
                  child: new ListTile(
                    title: new Container(child: new Text("Drag me")),
                  ),
                  menuItems: <Widget>[
                    new Container(
                      child: new IconButton(
                        icon: new Icon(Icons.delete),
                      ),
                    ),
                    new Container(
                      child: new IconButton(
                        icon: new Icon(Icons.info),
                      ),
                    ),
                  ],
                );
              }),
            )
            .toList(),
      ),
    );
  }
}

class SlideMenu extends StatefulWidget {
  final Widget child;
  final List<Widget> menuItems;

  SlideMenu({this.child, this.menuItems});

  @override
  _SlideMenuState createState() => new _SlideMenuState();
}

class _SlideMenuState extends State<SlideMenu> with SingleTickerProviderStateMixin {
  AnimationController _controller;

  @override
  initState() {
    super.initState();
    _controller = new AnimationController(vsync: this, duration: const Duration(milliseconds: 200));
  }

  @override
  dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final animation = new Tween(
      begin: const Offset(0.0, 0.0),
      end: const Offset(-0.2, 0.0)
    ).animate(new CurveTween(curve: Curves.decelerate).animate(_controller));

    return new GestureDetector(
      onHorizontalDragUpdate: (data) {
        // we can access context.size here
        setState(() {
          _controller.value -= data.primaryDelta / context.size.width;
        });
      },
      onHorizontalDragEnd: (data) {
        if (data.primaryVelocity > 2500)
          _controller.animateTo(.0); //close menu on fast swipe in the right direction
        else if (_controller.value >= .5 || data.primaryVelocity < -2500) // fully open if dragged a lot to left or on fast swipe to left
          _controller.animateTo(1.0);
        else // close if none of above
          _controller.animateTo(.0);
      },
      child: new Stack(
        children: <Widget>[
          new SlideTransition(position: animation, child: widget.child),
          new Positioned.fill(
            child: new LayoutBuilder(
              builder: (context, constraint) {
                return new AnimatedBuilder(
                  animation: _controller,
                  builder: (context, child) {
                    return new Stack(
                      children: <Widget>[
                        new Positioned(
                          right: .0,
                          top: .0,
                          bottom: .0,
                          width: constraint.maxWidth * animation.value.dx * -1,
                          child: new Container(
                            color: Colors.black26,
                            child: new Row(
                              children: widget.menuItems.map((child) {
                                return new Expanded(
                                  child: child,
                                );
                              }).toList(),
                            ),
                          ),
                        ),
                      ],
                    );
                  },
                );
              },
            ),
          )
        ],
      ),
    );
  }
}

EDIT

Flutter no longer allows type Animation<FractionalOffset> in SlideTransition animation property. According to this post https://groups.google.com/forum/#!topic/flutter-dev/fmr-C9xK5t4 it should be replaced with AlignmentTween but this also doesn't work. Instead, according to this issue: https://github.com/flutter/flutter/issues/13812 replacing it instead with a raw Tween and directly creating Offset object works instead. Unfortunately, the code is much less clear.