swipe_cards

A Flutter widget for Tinder like swipe cards. The card can be swiped right, left and up for different responses. Currently it supports the following responses:

• Right swipe for like
• Left swipe for nope
• Up swipe for superlike

Install

To install the package, add the following dependency to your pubspec.yaml

dependencies:
  swipe_cards: ^2.0.0+1

Usage

Basic

import 'package:swipe_cards/swipe_cards.dart';

SwipeCards(
            matchEngine: <MatchEngine>,
            itemBuilder: (BuildContext context, int index) {},
            onStackFinished: () {},
            itemChanged: (SwipeItem item, int index) {},
            upSwipeAllowed: <bool>,
            fillSpace: <bool>,
);

Attributes of SwipeCards

Key	Description
matchEngine	An instance of MatchEngine that acts as controller for trigerring swipes manually.
itemBuilder	A function that returns the view inside a swipe card.
likeTag	Widget appears in like/right area during swipe.
nopeTag	Widget appears in nope/left area during swipe.
superLikeTag	Widget appears in super-like/up area during swipe.
onStackFinished	A function that is triggered as soon as all the cards have been swiped.
itemChanged	A function that is triggered when item in the stack changes (moves to next card).
leftSwipeAllowed	To enable/disable left swipe. (Default: true)
rightSwipeAllowed	To enable/disable right swipe. (Default: true)
upSwipeAllowed	To enable/disable up swipe. (Default: false)
fillSpace	Config weather to fill up the space or not. (Default: true)
leftSwipeThreshold	Threshold for left swipe. The larger the number, the further the card needs to be dragged to activate the action. Must be less or equal to 0 to work correct. (Default: -0.45)
rightSwipeThreshold	Threshold for right swipe. The larger the number, the further the card needs to be dragged to activate the action. Must be bigger or equal to 0 to work correct. (Default: 0.45)
topSwipeThreshold	Threshold for top swipe. The larger the number, the further the card needs to be dragged to activate the action. (Default: -0.4)
onSwipeChange	Triggered when user dragging the card
onSwipeFinish	Triggered when user releases the card

MatchEngine

MatchEngine is the controller for the swipe cards. It takes swipeItems as an argument and is used to trigger the swipes manually, for example on button press. The data type of swipeItems is List<SwipeItem>.

MatchEngine _matchEngine = MatchEngine(swipeItems: List<SwipeItem>);

Functions in MatchEngine

Key	Description
_matchEngine.currentItem.like();	To trigger right swipe manually.
_matchEngine.currentItem.nope();	To trigger left swipe manually.
_matchEngine.currentItem.superLike();	To trigger up swipe manually.

SwipeItem

SwipeItem contains the actual data that can be rendered in the swipe card. Actually it is a wrapper over any dynamic object and just adds the functionality of like, nope and superlike to that object.

SwipeItem(
            content: "Anup Kumar Panwar",
            likeAction: () {
                log("Like");
            },
            nopeAction: () {
                log("Nope");
            },
            superlikeAction: () {
                log("Superlike");
            },
            onSlideUpdate: (SlideRegion? region){
                log("Region $region");
            }
);

Attributes of SwipeItem

Key	Description
content	An object that contains the actual data to be rendered in the swipe card.
likeAction	A function that is triggered when the card is liked.
nopeAction	A function that is triggered when the card is not liked / swiped left.
superlikeAction	A function that is triggered when the card is superliked.
onSlideUpdate	A function that is triggered when the card is being dragged and tells about the current region of the card.

Example

List<SwipeItem> _swipeItems = List<SwipeItem>();
  MatchEngine _matchEngine;
  GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey();
  List<String> _names = ["Red", "Blue", "Green", "Yellow", "Orange"];
  List<Color> _colors = [
    Colors.red,
    Colors.blue,
    Colors.green,
    Colors.yellow,
    Colors.orange
  ];

  @override
  void initState() {
    for (int i = 0; i < _names.length; i++) {
      _swipeItems.add(SwipeItem(
          content: Content(text: _names[i], color: _colors[i]),
          likeAction: () {
            ScaffoldMessenger.of(context).showSnackBar(SnackBar(
              content: Text("Liked ${_names[i]}"),
              duration: Duration(milliseconds: 500),
            ));
          },
          nopeAction: () {
            ScaffoldMessenger.of(context).showSnackBar(SnackBar(
              content: Text("Nope ${_names[i]}"),
              duration: Duration(milliseconds: 500),
            ));
          },
          superlikeAction: () {
            ScaffoldMessenger.of(context).showSnackBar(SnackBar(
              content: Text("Superliked ${_names[i]}"),
              duration: Duration(milliseconds: 500),
            ));
          },
          onSlideUpdate: (SlideRegion? region) async {
            print("Region $region");
          }));
    }

    _matchEngine = MatchEngine(swipeItems: _swipeItems);
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        key: _scaffoldKey,
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Container(
            child: Column(children: [
          Container(
            height: 550,
            child: SwipeCards(
              matchEngine: _matchEngine,
              itemBuilder: (BuildContext context, int index) {
                return Container(
                  alignment: Alignment.center,
                  color: _swipeItems[index].content.color,
                  child: Text(
                    _swipeItems[index].content.text,
                    style: TextStyle(fontSize: 100),
                  ),
                );
                  },
                  onStackFinished: () {
                    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                      content: Text("Stack Finished"),
                      duration: Duration(milliseconds: 500),
                    ));
                  },
                  itemChanged: (SwipeItem item, int index) {
                    print("item: ${item.content.text}, index: $index");
                  },
                  upSwipeAllowed: true,
                  fillSpace: true,
                ),
              ),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                children: [
                  RaisedButton(
                      onPressed: () {
                        _matchEngine.currentItem.nope();
                      },
                      child: Text("Nope")),
                  RaisedButton(
                      onPressed: () {
                        _matchEngine.currentItem.superLike();
                      },
                      child: Text("Superlike")),
                  RaisedButton(
                      onPressed: () {
                        _matchEngine.currentItem.like();
                      },
                      child: Text("Like"))
                ],
              )
            ])));
  }

  class Content {
    final String text;
    final Color color;

    Content({this.text, this.color});
  }

Screenshot