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List [index +1] works [index - 1] doesn't (Flutter)
How do I check if a list is empty?Finding the index of an item given a list containing it in PythonDifference between append vs. extend list methods in PythonAccessing the index in 'for' loops?How do I remove an element from a list by index in Python?Getting the last element of a list in PythonHow to make a flat list out of list of lists?How do I get the number of elements in a list in Python?How do I concatenate two lists in Python?How to clone or copy a list?
I have a method to skip to the next list item, which works fine, but the method to display the previous list item doesn't seem to re-render.
When I print to console, the list item index it goes down by 1, but the text widget doesn't update like it does when it increases by 1.
I have shown the 2x methods below and an excerpt from the build. Help! :)
void _skipFlashcard ()
setState(()
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var nextFlashcard = allFlashcards[currentIndex + 1];
widget.flashcardToShow = nextFlashcard;
print(widget.flashcardToShow.flashcardId);
);
void _previousFlashcard ()
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var previousFlashcard = allFlashcards[currentIndex - 1];
widget.flashcardToShow = previousFlashcard;
print(widget.flashcardToShow.flashcardId);
-------------------------
Container(
child: Row(
children: <Widget>[
Text(widget.flashcardToShow.flashcardId.toString()),
list
flutter setstate asked Mar 21 at 21:28
ChrisChris
13
add a comment |
I have a method to skip to the next list item, which works fine, but the method to display the previous list item doesn't seem to re-render.
When I print to console, the list item index it goes down by 1, but the text widget doesn't update like it does when it increases by 1.
I have shown the 2x methods below and an excerpt from the build. Help! :)
void _skipFlashcard ()
setState(()
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var nextFlashcard = allFlashcards[currentIndex + 1];
widget.flashcardToShow = nextFlashcard;
print(widget.flashcardToShow.flashcardId);
);
void _previousFlashcard ()
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var previousFlashcard = allFlashcards[currentIndex - 1];
widget.flashcardToShow = previousFlashcard;
print(widget.flashcardToShow.flashcardId);
-------------------------
Container(
child: Row(
children: <Widget>[
Text(widget.flashcardToShow.flashcardId.toString()),
list
flutter setstate asked Mar 21 at 21:28
ChrisChris
13
add a comment |
I have a method to skip to the next list item, which works fine, but the method to display the previous list item doesn't seem to re-render.
When I print to console, the list item index it goes down by 1, but the text widget doesn't update like it does when it increases by 1.
I have shown the 2x methods below and an excerpt from the build. Help! :)
void _skipFlashcard ()
setState(()
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var nextFlashcard = allFlashcards[currentIndex + 1];
widget.flashcardToShow = nextFlashcard;
print(widget.flashcardToShow.flashcardId);
);
void _previousFlashcard ()
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var previousFlashcard = allFlashcards[currentIndex - 1];
widget.flashcardToShow = previousFlashcard;
print(widget.flashcardToShow.flashcardId);
-------------------------
Container(
child: Row(
children: <Widget>[
Text(widget.flashcardToShow.flashcardId.toString()),
list
flutter setstate asked Mar 21 at 21:28
ChrisChris
13
I have a method to skip to the next list item, which works fine, but the method to display the previous list item doesn't seem to re-render.
When I print to console, the list item index it goes down by 1, but the text widget doesn't update like it does when it increases by 1.
I have shown the 2x methods below and an excerpt from the build. Help! :)
void _skipFlashcard ()
setState(()
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var nextFlashcard = allFlashcards[currentIndex + 1];
widget.flashcardToShow = nextFlashcard;
print(widget.flashcardToShow.flashcardId);
);
void _previousFlashcard ()
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var previousFlashcard = allFlashcards[currentIndex - 1];
widget.flashcardToShow = previousFlashcard;
print(widget.flashcardToShow.flashcardId);
-------------------------
Container(
child: Row(
children: <Widget>[
Text(widget.flashcardToShow.flashcardId.toString()),
list
flutter setstate list
flutter setstate asked Mar 21 at 21:28
ChrisChris
13
asked Mar 21 at 21:28
ChrisChris
13
asked Mar 21 at 21:28
ChrisChris
13
asked Mar 21 at 21:28
ChrisChris
13
asked Mar 21 at 21:28
ChrisChris
13
13
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Wrap your code in setState, that's all that is missed :-)
void _previousFlashcard ()
setState()
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var previousFlashcard = allFlashcards[currentIndex - 1];
widget.flashcardToShow = previousFlashcard;
print(widget.flashcardToShow.flashcardId);
answered Mar 21 at 21:34
Tom AlabasterTom Alabaster
605412
Ahhh I should have seen that!!! Thanks :)
– Chris
Mar 21 at 22:07
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Wrap your code in setState, that's all that is missed :-)
void _previousFlashcard ()
setState()
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var previousFlashcard = allFlashcards[currentIndex - 1];
widget.flashcardToShow = previousFlashcard;
print(widget.flashcardToShow.flashcardId);
answered Mar 21 at 21:34
Tom AlabasterTom Alabaster
605412
Ahhh I should have seen that!!! Thanks :)
– Chris
Mar 21 at 22:07
add a comment |
Wrap your code in setState, that's all that is missed :-)
void _previousFlashcard ()
setState()
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var previousFlashcard = allFlashcards[currentIndex - 1];
widget.flashcardToShow = previousFlashcard;
print(widget.flashcardToShow.flashcardId);
answered Mar 21 at 21:34
Tom AlabasterTom Alabaster
605412
Ahhh I should have seen that!!! Thanks :)
– Chris
Mar 21 at 22:07
add a comment |
Wrap your code in setState, that's all that is missed :-)
void _previousFlashcard ()
setState()
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var previousFlashcard = allFlashcards[currentIndex - 1];
widget.flashcardToShow = previousFlashcard;
print(widget.flashcardToShow.flashcardId);
answered Mar 21 at 21:34
Tom AlabasterTom Alabaster
605412
Wrap your code in setState, that's all that is missed :-)
void _previousFlashcard ()
setState()
int currentIndex = allFlashcards.indexOf(widget.flashcardToShow);
var previousFlashcard = allFlashcards[currentIndex - 1];
widget.flashcardToShow = previousFlashcard;
print(widget.flashcardToShow.flashcardId);
answered Mar 21 at 21:34
Tom AlabasterTom Alabaster
605412
answered Mar 21 at 21:34
Tom AlabasterTom Alabaster
605412
answered Mar 21 at 21:34
Tom AlabasterTom Alabaster
605412
answered Mar 21 at 21:34
Tom AlabasterTom Alabaster
605412
605412
Ahhh I should have seen that!!! Thanks :)
– Chris
Mar 21 at 22:07
add a comment |
Ahhh I should have seen that!!! Thanks :)
– Chris
Mar 21 at 22:07
Ahhh I should have seen that!!! Thanks :)
– Chris
Mar 21 at 22:07
Ahhh I should have seen that!!! Thanks :)
– Chris
Mar 21 at 22:07
add a comment |
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