How to detect swipe in flutter

Question

I've tried using the swipe detector plugin for flutter to achieve navigating to a new screen on swipe right but it's not working, no errors are thrown and the breakpoint is never hit when I debug it. I looked into the GestureDector but I wasn't sure it would work for a swipe right scenario, we want it to navigate to a screen when anywhere on the screen is swiped right.

Here's my code using the plugin

 @override
 Widget build(BuildContext context){
return new Scaffold(
 appBar : LBAppBar().getAppBar(),
  //drawer: new LBDrawer().getDrawer(),
 body:  Container(
decoration: BoxDecoration(
    gradient: new LinearGradient(
        colors: [Color.fromRGBO(1,89,99, 1.0), Colors.grey],
        begin: Alignment.bottomLeft,
        end: Alignment.topRight
    )
),
 child: 
 SwipeDetector(
     onSwipeRight: () {
       Navigator.of(context).push(new MaterialPageRoute(builder: (BuildContext context) => new WidgetsPage())
        ); },
  child: Column(
  mainAxisAlignment: MainAxisAlignment.center,    
  children:[
    Row(
            children: [
          Container(
            margin: EdgeInsets.only(left: 20.0,top: 10.0, bottom: 10.0, right:30.0),
            child: Column(
  children: <Widget>[



            Text("Hi ${user.firstName}, Today is " + formatDate(), style: new TextStyle( color: Colors.white70, fontWeight: FontWeight.bold, fontSize: 19.0 
 )),




        ],

         ),
                 ),
                  ]
            ),

      Row(
        //ROW 1
        children: [
          Container(
            margin: EdgeInsets.only(left: 30.0,top: 60.0, bottom: 30.0, right:30.0),
            child: Column(
      children: <Widget>[
           GestureDetector(
                 child: Icon(
                 FontAwesomeIcons.checkSquare,
                 size: 50.0,
                 color: Colors.white70,
         ),
              onTap: () {
                        Navigator.of(context).push(new MaterialPageRoute(builder: (BuildContext context) => new CheckIn()));
                      }),
                Text("Check In", style: new TextStyle( color: Colors.white70, fontWeight: FontWeight.normal ))
  ],
 ),
              ),
              Container(
           margin: EdgeInsets.only(left: 50.0,top: 60.0, bottom: 30.0, right:30.0),
                child: Column(
      children: <Widget>[
           GestureDetector(

                 child: Icon(
                 FontAwesomeIcons.list,
                 size: 50.0,
                  color: Colors.white70,
         ),
              onTap: () {
                    Navigator.of(context).push(new MaterialPageRoute(builder: (BuildContext context) => new DayAtAGlance()));
                      }),
            Text("My Day", style: new TextStyle( color: Colors.white70, fontWeight: FontWeight.normal ))
],
 ),
               ),
            Container(
           margin: EdgeInsets.only(left: 30.0,top: 60.0, bottom: 30.0, right:30.0),
            child: Column(
  children: <Widget>[
       GestureDetector(
                 child: Icon(
                 FontAwesomeIcons.phone,
                 size: 45.0,
                  color: Colors.white70,
         ),
              onTap: () {
                    Navigator.of(context).push(new MaterialPageRoute(builder: (BuildContext context) => new CommunicationLinks()));
                      }),
              Text("Communication", style: new TextStyle( color: Colors.white70, fontWeight: FontWeight.normal ))
  ],
 ),
             ),
             ]
              ),
         Row(//ROW 2
          children: [
        Container(
           margin: EdgeInsets.only(left: 32.0,top: 50.0, bottom: 30.0),
            child: Column(
  children: <Widget>[
       GestureDetector(
                 child: Icon(
                 FontAwesomeIcons.dollarSign,
                 size: 50.0,
                  color: Colors.white70,
           ),
              onTap: () {
                   Navigator.of(context).push(new MaterialPageRoute(builder: (BuildContext context) => new Budget()));
                      }),
            Text("Budget", style: new TextStyle( color: Colors.white70, fontWeight: FontWeight.normal ))
],
 ),

              ),
        Container(
           margin: EdgeInsets.only(left: 75.0, top: 50.0, bottom: 30.0, right: 30.0),
            child: Column(
  children: <Widget>[
       GestureDetector(
                 child: Icon(
                 FontAwesomeIcons.trophy,
                 size: 50.0,
                  color:  Colors.white70,
         ),
              onTap: () {
                    print("Pressed");
                      }),
            Text("Goals", style: new TextStyle( color:  Colors.white70, fontWeight: FontWeight.normal ))
],
),

            ),
         Container(
           margin: EdgeInsets.only(left: 50.0, top: 50.0, bottom: 30.0, right: 20.0),
            child: Column(
  children: <Widget>[
       GestureDetector(
                 child: Icon(
                 FontAwesomeIcons.calendar,
                 size: 50.0,
                  color: Colors.white70,
         ),
              onTap: () {

                   Navigator.of(context).push(new MaterialPageRoute(builder: (BuildContext context) => new CalendarsPage()));
                      }),
            Text("Calendar", style: new TextStyle( color: Colors.white70, fontWeight: FontWeight.normal ))
  ],
),
            )
         ]),
      Row(// ROW 3
          children: [
        Container(
           margin: EdgeInsets.only(left: 30.0, top: 50.0, bottom: 30.0, right: 30.0),
            child: Column(
  children: <Widget>[
       GestureDetector(
                 child: Icon(
                 FontAwesomeIcons.comments,
                 size: 50.0,
                  color: Colors.white70,
         ),
              onTap: () {
                    print("Pressed");
                      }),
            Text("Community", style: new TextStyle( color: Colors.white70, fontWeight: FontWeight.normal ))
  ],
),

            ),
        Container(
           margin: EdgeInsets.only(left: 20.0, top: 50.0, bottom: 30.0, right: 20.0),
            child: Column(
  children: <Widget>[
       GestureDetector(
                 child: Icon(
                 FontAwesomeIcons.shoppingCart,
                 size: 50.0,
                 color: Colors.white70,
         ),
              onTap: () {
                     Navigator.of(context).push(new MaterialPageRoute(builder: (BuildContext context) => new ShoppingList()));
                      }),
            Text("Shopping", style: new TextStyle( color: Colors.white70, fontWeight: FontWeight.normal ))
  ],
),

              ),
          Container(
           margin: EdgeInsets.only(left: 50.0, top: 50.0, bottom: 30.0, right: 40.0),
            child: Column(
  children: <Widget>[
       GestureDetector(
                 child: Icon(
                 FontAwesomeIcons.solidCheckSquare,
                 size: 50.0,
                  color: Colors.white70,
         ),
              onTap: () {
                    Navigator.of(context).push(new MaterialPageRoute(builder: (BuildContext context) => new CheckOut()));
                      }),
            Text("Check Out", style: new TextStyle( color: Colors.white70, fontWeight: FontWeight.bold ))
],
),

            ),
      ]),
    ],
      ),
   )


 )


   );

Solution 1

Use GestureDetector.onPanUpdate:

GestureDetector(
  onPanUpdate: (details) {
    // Swiping in right direction.
    if (details.delta.dx > 0) {}
  
    // Swiping in left direction.
    if (details.delta.dx < 0) {}
  },
  child: YourWidget(),
)

---

To cover all the area (passing the parent constraints to the widget), you can include SizedBox.expand.

SizedBox.expand(
  child: GestureDetector(
    onPanUpdate: (details) {
      // Swiping in right direction.
      if (details.delta.dx > 0) {}

      // Swiping in left direction.
      if (details.delta.dx < 0) {}
    },
    child: YourWidget(),
  ),
)

Solution 2

Wrap your Widget in GestureDetector and use onHorizontalDragUpdate as,

GestureDetector(
    onHorizontalDragUpdate: (details) {  
        // Note: Sensitivity is integer used when you don't want to mess up vertical drag
        int sensitivity = 8;
        if (details.delta.dx > sensitivity) {
            // Right Swipe
        } else if(details.delta.dx < -sensitivity){
            //Left Swipe
        }
    }
);

Or if you're looking for a vertical swipe, you can use this code:

GestureDetector(
    onVerticalDragUpdate: (details) {
        int sensitivity = 8;
        if (details.delta.dy > sensitivity) {
            // Down Swipe
        } else if(details.delta.dy < -sensitivity){
            // Up Swipe
        }
    }
)

Solution 3

To piggy back off of @Vimal Rai's answer. I found that onHorizontalDragUpdate calls the function with every update. That could lead to unwanted behavior in your app. If you want the function to be called just once upon swiping, go with OnHorizontalDragEnd:

GestureDetector(
    onHorizontalDragEnd: (DragEndDetails details) {
      if (details.primaryVelocity > 0) {
        // User swiped Left
      } else if (details.primaryVelocity < 0) {
        // User swiped Right
      }
    }
);

Solution 4

In some cases GestureDetector does not fire gesture events if it's used as a child or parent of other scrollable widgets. Maybe a better! way to detect any gesture is to use Listener widget.

Listener(
   onPointerMove: (moveEvent){
      if(moveEvent.delta.dx > 0) {
          print("swipe right");
      }
   }
    child: PageView(...) // or any other widget
)

Solution 5

This is my solution using GestureDetector. I put the handler inside onPanEnd, as onPanUpdate gets called multiple times when the swiping is in progress.

@override
  Widget build(BuildContext context) {
    String? swipeDirection;

    return GestureDetector(
      onPanUpdate: (details) {
        swipeDirection = details.delta.dx < 0 ? 'left' : 'right';
      },
      onPanEnd: (details) {
        if (swipeDirection == null) {
          return;
        }
        if (swipeDirection == 'left') {
          //handle swipe left event
        }
        if (swipeDirection == 'right') {
          //handle swipe right event
        }
      },
      child: //child widget
    );
  }

View more solutions

Comments

[Sam Cromer]

Can I wrap the entire screen? We want to have swipe right capabilities on the entire screen.

[CopsOnRoad]

I believe, you can do that too by wrapping your root widget (the one inside body of Scaffold)

[Sam Cromer]

The swipe right is working but none of the screens content is showing up.

[Taras Lukavyi]

add child to GestureDetector

[Kamlesh]

undefined 'sensitivity'?

[Vimal Rai]

Sensitivity is an integer used to perform an action when a user has swiped up to some extent.

[Nizar B.]

This has nothing to do with detecting swipe.

[b0rgBart3]

This works great- I set the sensitivity to 8. But I'm curious if there is a standard amount that would be considered a "swipe".

[Viraj D]

If this code is being triggered many times on swiping right then you can use this solution (Probably there is a better way to do this but this works for me) int test = 0 if (details.delta.dx > 0 && test == 0) { test += 1 /*your code*/ } and on swipe left set the variable (test) to 0 again

[malik kurosaki]

Thanks, your solution saved my day, I can attach it to the multilevel pageview

[Yavuz Tarhan]

thanx, others call the func too many times

[Luke Irvin]

This still detects diagonal drags. Is there a way to prevent that or to ignore those?

[Luke Irvin]

Could I get more context on these --> tapOperator(widget.settings.swipeUpOperator),

[Bugzilla]

@LukeIrvin oops, that wasn't supposed to be there. It's just the function to be executed when a swipe is detected

[Luis]

details.velocity.pixelsPerSecond provides an offset for x and y values. Have you looked at those?

[geisterfurz007]

Note: If the user dragged, then stopped their finger for a second then lift their finger, the reported velocity in the details will be 0.

[batuhankrbb]

This idea is brilliant! Other answers triggers the swipe function many times but this is so good. Thanks!

[JahidRatul]

very nice , perfect one for swipe to widget