ScrollController animateTo()
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}
I want the selected item in the horizontal listView to be centered, so I first calculate the position that should animate to (scroll to), and it is always calculated correctly, but when I select an item that is far from the currently selected one, the list doesn't scroll correctly to the calculated position.
Code:
double _position = index * (_width + 2 * _horizontalPadding)
+ (_selectedWidth+_horizontalPadding);
_scrollController.animateTo(
_position,
duration: Duration(milliseconds: 1000),
curve: Curves.ease);
where _width is the width of all elements but the selected one, as its width is _selectedWidth , and horizontal padding is constant .. and index is the index of the selected item
flutter flutter-animation asked Nov 23 '18 at 12:19
Omar FarragOmar Farrag
227
add a comment |
I want the selected item in the horizontal listView to be centered, so I first calculate the position that should animate to (scroll to), and it is always calculated correctly, but when I select an item that is far from the currently selected one, the list doesn't scroll correctly to the calculated position.
Code:
double _position = index * (_width + 2 * _horizontalPadding)
+ (_selectedWidth+_horizontalPadding);
_scrollController.animateTo(
_position,
duration: Duration(milliseconds: 1000),
curve: Curves.ease);
where _width is the width of all elements but the selected one, as its width is _selectedWidth , and horizontal padding is constant .. and index is the index of the selected item
flutter flutter-animation asked Nov 23 '18 at 12:19
Omar FarragOmar Farrag
227
It better if you can provide relavent code snippet with this nice explonation, so that we can help better
– Blasanka
Nov 23 '18 at 12:22
@Blasanka added the code
– Omar Farrag
Nov 23 '18 at 12:33
add a comment |
I want the selected item in the horizontal listView to be centered, so I first calculate the position that should animate to (scroll to), and it is always calculated correctly, but when I select an item that is far from the currently selected one, the list doesn't scroll correctly to the calculated position.
Code:
double _position = index * (_width + 2 * _horizontalPadding)
+ (_selectedWidth+_horizontalPadding);
_scrollController.animateTo(
_position,
duration: Duration(milliseconds: 1000),
curve: Curves.ease);
where _width is the width of all elements but the selected one, as its width is _selectedWidth , and horizontal padding is constant .. and index is the index of the selected item
flutter flutter-animation asked Nov 23 '18 at 12:19
Omar FarragOmar Farrag
227
I want the selected item in the horizontal listView to be centered, so I first calculate the position that should animate to (scroll to), and it is always calculated correctly, but when I select an item that is far from the currently selected one, the list doesn't scroll correctly to the calculated position.
Code:
double _position = index * (_width + 2 * _horizontalPadding)
+ (_selectedWidth+_horizontalPadding);
_scrollController.animateTo(
_position,
duration: Duration(milliseconds: 1000),
curve: Curves.ease);
where _width is the width of all elements but the selected one, as its width is _selectedWidth , and horizontal padding is constant .. and index is the index of the selected item
flutter flutter-animation flutter flutter-animation asked Nov 23 '18 at 12:19
Omar FarragOmar Farrag
227
asked Nov 23 '18 at 12:19
Omar FarragOmar Farrag
227
edited Nov 23 '18 at 13:03
Omar Farrag
asked Nov 23 '18 at 12:19
Omar FarragOmar Farrag
227
asked Nov 23 '18 at 12:19
Omar FarragOmar Farrag
227
asked Nov 23 '18 at 12:19
Omar FarragOmar Farrag
227
227
It better if you can provide relavent code snippet with this nice explonation, so that we can help better
– Blasanka
Nov 23 '18 at 12:22
@Blasanka added the code
– Omar Farrag
Nov 23 '18 at 12:33
add a comment |
It better if you can provide relavent code snippet with this nice explonation, so that we can help better
– Blasanka
Nov 23 '18 at 12:22
@Blasanka added the code
– Omar Farrag
Nov 23 '18 at 12:33
It better if you can provide relavent code snippet with this nice explonation, so that we can help better
– Blasanka
Nov 23 '18 at 12:22
It better if you can provide relavent code snippet with this nice explonation, so that we can help better
– Blasanka
Nov 23 '18 at 12:22
@Blasanka added the code
– Omar Farrag
Nov 23 '18 at 12:33
@Blasanka added the code
– Omar Farrag
Nov 23 '18 at 12:33
add a comment |
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It better if you can provide relavent code snippet with this nice explonation, so that we can help better
– Blasanka
Nov 23 '18 at 12:22
@Blasanka added the code
– Omar Farrag
Nov 23 '18 at 12:33