flutter listview alphabet index












0














How to get the finger movement event in flutter like 'recyclerview alphabet index in android' check the sample image.



I have created a Positioned alphabet index listview but I can't find the current index in DragUpdate.



            var alphabet = ["#","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];

new Positioned(
top: .0,
left: 1,
bottom: 10,
width: 55,
child: Material(
borderRadius: BorderRadius.circular(15.0),
elevation: 10.0,
child: ListView.builder(
itemCount: alphabet.length,
itemBuilder: (BuildContext context, int index) {


return new GestureDetector(
onVerticalDragUpdate:
(DragUpdateDetails detail) {
setState(() {
_barOffset += detail.delta.dy;
});

print("$detail");
print("Update ${alphabet[index]}");
},

onVerticalDragStart: (DragStartDetails detail) {
print("onVerticalDragStart");
print("Start ${alphabet[index]}");
},
onVerticalDragEnd: (DragEndDetails detail) {
print("onVerticalDragEnd");
print("End ${alphabet[index]}");
},
onTap: () => print(alphabet[index]),
child: new Container(
margin: EdgeInsets.only(
left: 20.0, right: 10.0, top: 6.5),
height: 15.0,
child: new Text('${alphabet[index]}'),
));
}),
),


enter image description here










share|improve this question






















  • pub.dartlang.org/packages/side_header_list_view is somewhat similar
    – Günter Zöchbauer
    Nov 22 at 14:14










  • or maybe this one: pub.dartlang.org/packages/draggable_scrollbar
    – diegoveloper
    Nov 22 at 14:47
















0














How to get the finger movement event in flutter like 'recyclerview alphabet index in android' check the sample image.



I have created a Positioned alphabet index listview but I can't find the current index in DragUpdate.



            var alphabet = ["#","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];

new Positioned(
top: .0,
left: 1,
bottom: 10,
width: 55,
child: Material(
borderRadius: BorderRadius.circular(15.0),
elevation: 10.0,
child: ListView.builder(
itemCount: alphabet.length,
itemBuilder: (BuildContext context, int index) {


return new GestureDetector(
onVerticalDragUpdate:
(DragUpdateDetails detail) {
setState(() {
_barOffset += detail.delta.dy;
});

print("$detail");
print("Update ${alphabet[index]}");
},

onVerticalDragStart: (DragStartDetails detail) {
print("onVerticalDragStart");
print("Start ${alphabet[index]}");
},
onVerticalDragEnd: (DragEndDetails detail) {
print("onVerticalDragEnd");
print("End ${alphabet[index]}");
},
onTap: () => print(alphabet[index]),
child: new Container(
margin: EdgeInsets.only(
left: 20.0, right: 10.0, top: 6.5),
height: 15.0,
child: new Text('${alphabet[index]}'),
));
}),
),


enter image description here










share|improve this question






















  • pub.dartlang.org/packages/side_header_list_view is somewhat similar
    – Günter Zöchbauer
    Nov 22 at 14:14










  • or maybe this one: pub.dartlang.org/packages/draggable_scrollbar
    – diegoveloper
    Nov 22 at 14:47














0












0








0







How to get the finger movement event in flutter like 'recyclerview alphabet index in android' check the sample image.



I have created a Positioned alphabet index listview but I can't find the current index in DragUpdate.



            var alphabet = ["#","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];

new Positioned(
top: .0,
left: 1,
bottom: 10,
width: 55,
child: Material(
borderRadius: BorderRadius.circular(15.0),
elevation: 10.0,
child: ListView.builder(
itemCount: alphabet.length,
itemBuilder: (BuildContext context, int index) {


return new GestureDetector(
onVerticalDragUpdate:
(DragUpdateDetails detail) {
setState(() {
_barOffset += detail.delta.dy;
});

print("$detail");
print("Update ${alphabet[index]}");
},

onVerticalDragStart: (DragStartDetails detail) {
print("onVerticalDragStart");
print("Start ${alphabet[index]}");
},
onVerticalDragEnd: (DragEndDetails detail) {
print("onVerticalDragEnd");
print("End ${alphabet[index]}");
},
onTap: () => print(alphabet[index]),
child: new Container(
margin: EdgeInsets.only(
left: 20.0, right: 10.0, top: 6.5),
height: 15.0,
child: new Text('${alphabet[index]}'),
));
}),
),


enter image description here










share|improve this question













How to get the finger movement event in flutter like 'recyclerview alphabet index in android' check the sample image.



I have created a Positioned alphabet index listview but I can't find the current index in DragUpdate.



            var alphabet = ["#","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];

new Positioned(
top: .0,
left: 1,
bottom: 10,
width: 55,
child: Material(
borderRadius: BorderRadius.circular(15.0),
elevation: 10.0,
child: ListView.builder(
itemCount: alphabet.length,
itemBuilder: (BuildContext context, int index) {


return new GestureDetector(
onVerticalDragUpdate:
(DragUpdateDetails detail) {
setState(() {
_barOffset += detail.delta.dy;
});

print("$detail");
print("Update ${alphabet[index]}");
},

onVerticalDragStart: (DragStartDetails detail) {
print("onVerticalDragStart");
print("Start ${alphabet[index]}");
},
onVerticalDragEnd: (DragEndDetails detail) {
print("onVerticalDragEnd");
print("End ${alphabet[index]}");
},
onTap: () => print(alphabet[index]),
child: new Container(
margin: EdgeInsets.only(
left: 20.0, right: 10.0, top: 6.5),
height: 15.0,
child: new Text('${alphabet[index]}'),
));
}),
),


enter image description here







listview flutter alphabet






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 22 at 14:13









Anish Manchappillil

1177




1177












  • pub.dartlang.org/packages/side_header_list_view is somewhat similar
    – Günter Zöchbauer
    Nov 22 at 14:14










  • or maybe this one: pub.dartlang.org/packages/draggable_scrollbar
    – diegoveloper
    Nov 22 at 14:47


















  • pub.dartlang.org/packages/side_header_list_view is somewhat similar
    – Günter Zöchbauer
    Nov 22 at 14:14










  • or maybe this one: pub.dartlang.org/packages/draggable_scrollbar
    – diegoveloper
    Nov 22 at 14:47
















pub.dartlang.org/packages/side_header_list_view is somewhat similar
– Günter Zöchbauer
Nov 22 at 14:14




pub.dartlang.org/packages/side_header_list_view is somewhat similar
– Günter Zöchbauer
Nov 22 at 14:14












or maybe this one: pub.dartlang.org/packages/draggable_scrollbar
– diegoveloper
Nov 22 at 14:47




or maybe this one: pub.dartlang.org/packages/draggable_scrollbar
– diegoveloper
Nov 22 at 14:47

















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