Make itemBuilder run every time without calling setState()
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I am having a code like this for PageView.builder
@override
Widget build(BuildContext context) {
return PageView.builder(
itemCount: myList.length,
onPageChanged: (int pageIndex) => setState(() => index = pageIndex), // this make it work fine
itemBuilder: (context, index) => MyPage(myList[index])
);
}
The problem with this itemBuilder (of PageView.builder) and normal itemBuilder (of ListView.builder) is that they stop getting called once they have drawn the widget on the screen for previous index value.
Now in my use case, I want this itemBuilder to fire every time the Page has changed in the PageView because I am updating list and now I want to show new data in MyPage for new list. How to do that?
PS: There is onPageChanged() callback and I can use setState() in that, it works fine but it simply ruins the purpose of PageView OR is it okay to use setState() in onPageChanged(), wont' that be redundant?
dart 
flutter asked Nov 11 at 16:16
Volley Ball
386114
add a comment |
up vote
0
down vote
favorite
I am having a code like this for PageView.builder
@override
Widget build(BuildContext context) {
return PageView.builder(
itemCount: myList.length,
onPageChanged: (int pageIndex) => setState(() => index = pageIndex), // this make it work fine
itemBuilder: (context, index) => MyPage(myList[index])
);
}
The problem with this itemBuilder (of PageView.builder) and normal itemBuilder (of ListView.builder) is that they stop getting called once they have drawn the widget on the screen for previous index value.
Now in my use case, I want this itemBuilder to fire every time the Page has changed in the PageView because I am updating list and now I want to show new data in MyPage for new list. How to do that?
PS: There is onPageChanged() callback and I can use setState() in that, it works fine but it simply ruins the purpose of PageView OR is it okay to use setState() in onPageChanged(), wont' that be redundant?
dart flutter asked Nov 11 at 16:16
Volley Ball
386114
so you have to rebuild yourPageViewas there is no "animated" alternative likeAnimatedListfor staticListView
– pskink
Nov 17 at 9:31
So, I ended up calling setState() to solve the issue. Not a nice solution but worked for me.
– Volley Ball
Nov 17 at 9:33
you dont have to use anyonPageChangedand callsetState- just make surePageViewis rebuilt - like here
– pskink
Nov 17 at 9:38
@pskink I am sorry, I didn't quite try it yet, I am still using my solution of callingsetState()fromonPageChanged().
– Volley Ball
Nov 17 at 11:47
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I am having a code like this for PageView.builder
@override
Widget build(BuildContext context) {
return PageView.builder(
itemCount: myList.length,
onPageChanged: (int pageIndex) => setState(() => index = pageIndex), // this make it work fine
itemBuilder: (context, index) => MyPage(myList[index])
);
}
The problem with this itemBuilder (of PageView.builder) and normal itemBuilder (of ListView.builder) is that they stop getting called once they have drawn the widget on the screen for previous index value.
Now in my use case, I want this itemBuilder to fire every time the Page has changed in the PageView because I am updating list and now I want to show new data in MyPage for new list. How to do that?
PS: There is onPageChanged() callback and I can use setState() in that, it works fine but it simply ruins the purpose of PageView OR is it okay to use setState() in onPageChanged(), wont' that be redundant?
dart flutter asked Nov 11 at 16:16
Volley Ball
386114
I am having a code like this for PageView.builder
@override
Widget build(BuildContext context) {
return PageView.builder(
itemCount: myList.length,
onPageChanged: (int pageIndex) => setState(() => index = pageIndex), // this make it work fine
itemBuilder: (context, index) => MyPage(myList[index])
);
}
The problem with this itemBuilder (of PageView.builder) and normal itemBuilder (of ListView.builder) is that they stop getting called once they have drawn the widget on the screen for previous index value.
Now in my use case, I want this itemBuilder to fire every time the Page has changed in the PageView because I am updating list and now I want to show new data in MyPage for new list. How to do that?
PS: There is onPageChanged() callback and I can use setState() in that, it works fine but it simply ruins the purpose of PageView OR is it okay to use setState() in onPageChanged(), wont' that be redundant?
dart flutter dart flutter asked Nov 11 at 16:16
Volley Ball
386114
asked Nov 11 at 16:16
Volley Ball
386114
edited Nov 11 at 16:47
asked Nov 11 at 16:16
Volley Ball
386114
asked Nov 11 at 16:16
Volley Ball
386114
asked Nov 11 at 16:16
Volley Ball
386114
386114
so you have to rebuild yourPageViewas there is no "animated" alternative likeAnimatedListfor staticListView
– pskink
Nov 17 at 9:31
So, I ended up calling setState() to solve the issue. Not a nice solution but worked for me.
– Volley Ball
Nov 17 at 9:33
you dont have to use anyonPageChangedand callsetState- just make surePageViewis rebuilt - like here
– pskink
Nov 17 at 9:38
@pskink I am sorry, I didn't quite try it yet, I am still using my solution of callingsetState()fromonPageChanged().
– Volley Ball
Nov 17 at 11:47
add a comment |
so you have to rebuild yourPageViewas there is no "animated" alternative likeAnimatedListfor staticListView
– pskink
Nov 17 at 9:31
So, I ended up calling setState() to solve the issue. Not a nice solution but worked for me.
– Volley Ball
Nov 17 at 9:33
you dont have to use anyonPageChangedand callsetState- just make surePageViewis rebuilt - like here
– pskink
Nov 17 at 9:38
@pskink I am sorry, I didn't quite try it yet, I am still using my solution of callingsetState()fromonPageChanged().
– Volley Ball
Nov 17 at 11:47
so you have to rebuild your
PageView as there is no "animated" alternative like AnimatedList for static ListView– pskink
Nov 17 at 9:31
so you have to rebuild your
PageView as there is no "animated" alternative like AnimatedList for static ListView– pskink
Nov 17 at 9:31
So, I ended up calling setState() to solve the issue. Not a nice solution but worked for me.
– Volley Ball
Nov 17 at 9:33
So, I ended up calling setState() to solve the issue. Not a nice solution but worked for me.
– Volley Ball
Nov 17 at 9:33
you dont have to use any
onPageChanged and call setState - just make sure PageView is rebuilt - like here– pskink
Nov 17 at 9:38
you dont have to use any
onPageChanged and call setState - just make sure PageView is rebuilt - like here– pskink
Nov 17 at 9:38
@pskink I am sorry, I didn't quite try it yet, I am still using my solution of calling
setState() from onPageChanged().– Volley Ball
Nov 17 at 11:47
@pskink I am sorry, I didn't quite try it yet, I am still using my solution of calling
setState() from onPageChanged().– Volley Ball
Nov 17 at 11:47
add a comment |
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so you have to rebuild your
PageViewas there is no "animated" alternative likeAnimatedListfor staticListView– pskink
Nov 17 at 9:31
So, I ended up calling setState() to solve the issue. Not a nice solution but worked for me.
– Volley Ball
Nov 17 at 9:33
you dont have to use any
onPageChangedand callsetState- just make surePageViewis rebuilt - like here– pskink
Nov 17 at 9:38
@pskink I am sorry, I didn't quite try it yet, I am still using my solution of calling
setState()fromonPageChanged().– Volley Ball
Nov 17 at 11:47