this is Antika. I have started learning to code since a few days back, and am only familiar with HTML/CSS/JS, and basics of dart/flutter
Developer Level: Beginner
Project type & language: I'm developing a Simple Notepad App, using flutter.
In my Project,
I want to dynamically add new TextField widgets on the screen, once the user hits enter or clicks the next button ('➡️'), in mobile devices, Just after the TextField in focus, and not to the end of the List.
Outline
User types text >> Clicks Submit >> Keeping in mind TextField in focus >> Add another TextField just after this one. >> The User feels like entering a new line.
For e.g., as is shown in the image below.
You could use a list with initially one TextField widget and onSubmitted adds another TextField to the list.
class MyWidget
extends StatefulWidget {
MyWidget({Key? key}) : super(key: key);
#override
State<MyWidget> createState() => _MyWidgetState();
}
class _MyWidgetState extends State<MyWidget> {
List<TextField> textFields = [];
#override
void initState(){
super.initState();
textFields.add(_buildTextField());
}
#override
Widget build(BuildContext context) {
return ListView(
children: textFields
);
}
TextField _buildTextField(){
return TextField(
autofocus: true,
onSubmitted: (_){
setState((){
textFields.add(_buildTextField());
});
}
);
}
}
Related
I want to create a list of widgets depending on the content of two or three dynamically generated lists.
List<String> Sound = ['A','B','C'];
List<String> Number = ['1','2','3'];
List<int> vertical = [10,20,30];
List<int> horizontal = [20,30,40];
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Row(
children: Sounds.map((sound) {
return FloatingActionButton(
onPressed: () => _audioCache.play(Sound),
child: Text(Number),
);
}).toList(),
),
),
);
}
}
Using the map function it seems like I can only build a list of Floating action buttons with one property. I want to give each button created by the map function properties from multiple different lists. How can I achieve that? This build function is in the state class of a stateful widget.
To expand on Uni's comment, here is a simple Dart program that shows the use of List.generate to create a list of Maps from two lists - your code would create your widgets:
void main() {
List<String> Sound = ['A', 'B', 'C'];
List<String> Number = ['1', '2', '3'];
var list = List.generate(
Sound.length,
(i) => {'Sound': Sound[i], 'Number': Number[i]},
);
print(list);
}
BTW it is recommended to name non-constant identifiers using lowerCamelCase, so Sound should be sound.
I would personally remodel the data.
If you are always using the same index of each list to build the widget why not make the a class with a sound and a number as properties then have one list of those objects.
Then the map you have would just be over those objects
I'm Developing Flutter Mobile Application. I want to Navigate another Page(With the Bottom Tab bar as display in the Picture) and I want to select a dropdown within the navigation's page. I think My problem is clear to you.
I Don't want to push that page.
And I don't want to duplicate My global Key
I added some screenshots of my app and numbers to understand you.
By Using a provider you can easily navigate between Navigation Tabs
Create a Provider for TabBar:
class MainTabProvider extends ChangeNotifier {
int _currentIndex = 0;
int get currentIndex {
return _currentIndex;
}
void setIndex(int index) {
_currentIndex = index;
notifyListeners();
}
}
Wrap you Tabbar with the Consumer
#override
Widget build(BuildContext context) {
return Consumer<MainTabProvider>(
builder: (context, data, child) => Scaffold(
backgroundColor: Colors.white,
body: _children[data.currentIndex],
......
Change Index from anywhere:
Provider.of<MainTabProvider>(context, listen: false).setIndex(2)
I'm receiving a list of images that I want to display dynamically in rows of 4 items each row. If there are 5 itens the row should wrap. The thing is, I need the images to allow for a longpress click that opens edit buttons in the appBar. Besides the edit button when longing pressing, it should allow for multiple selecting the other images.
Could this code be adapted for that:
class cardy extends StatefulWidget {
#override
_cardyState createState() => new _cardyState();
}
class _cardyState extends State<cardy> {
var isSelected = false;
var mycolor=Colors.white;
#override
Widget build(BuildContext context) {
return new Card(
color: mycolor,
child: new Column(mainAxisSize: MainAxisSize.min, children: <Widget>[
new ListTile(
selected: isSelected,
leading: const Icon(Icons.info),
title: new Text("Test"),
subtitle: new Text("Test Desc"),
trailing: new Text("3"),
onLongPress: toggleSelection // what should I put here,
)
]),
);
}
void toggleSelection() {
setState(() {
if (isSelected) {
mycolor=Colors.white;
isSelected = false;
} else {
mycolor=Colors.grey[300];
isSelected = true;
}
});
}
}
Yes, this code can be adapted for that ;)
To start, check out SliverGrid class.
https://api.flutter.dev/flutter/widgets/SliverGrid-class.html
Here is a (not complete) snippet to get you started, but you'll have to specify what options you want to use because this will not copy and paste solve your problem:
SliverGrid(
gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(
maxCrossAxisExtent: 200.0,
mainAxisSpacing: 5,
crossAxisSpacing: 3,
crossAxisCount,
),
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
return Container()})),
I'll note that if you want to use the information you're gathering, namely which images you're selecting, do take care to store that information somewhere. That is, your example toggles selection for a single item, but how will you get that information later? That is, if you click 3 items then hit edit, you need a way to record which 3 items have been selected. One option is maintaining a list and .removing / .adding it as part of your toggle.
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In flutter, how do we create a text widget, which will show just one line of a text , but it will expand to show all the contents of the text when clicked?
Welcome to the flutter world.
The widget you are looking for is ExpansionTile:
A simple code example:
ExpansionTile(
title: Text('My Expansion Tile'),
children: <Widget>[
Text('Item 1'),
Text('Item 2')],
),
Personally though, I use the Expandable package, which is an expansion tile on steroids.
If offers improved control and customisability. Check out their docs that have some really good examples.
Just try your code with Flexible class.
You can find the reference here, here. Or, read the docs here.
Hope it will help.
If i understand well you want only a part of the text to be show initially and when tapped on it expands or contracts back.
Try this custom stateful widget i implemented bellow..hope it helps
class ExpandableText extends StatefulWidget {
ExpandableText({this.text = ""});
//text is the total text of our expandable widget
final String text;
#override
_ExpandableTextState createState() => _ExpandableTextState();
}
class _ExpandableTextState extends State<ExpandableText> {
String textToDisplay;
#override
void initState() {
//if the text has more than a certain number of characters, the text we display will consist of that number of characters;
//if it's not longer we display all the text
print(widget.text.length);
//we arbitrarily chose 25 as the length
textToDisplay =
widget.text.length > 25 ? widget.text.substring(0,25)+"..." : widget.text;
super.initState();
}
#override
Widget build(BuildContext context) {
return InkWell(
child: Text(textToDisplay),
onTap: () {
//if the text is not expanded we show it all
if (widget.text.length > 25 && textToDisplay.length <= 25) {
setState(() {
textToDisplay = widget.text;
});
}
//else if the text is already expanded we contract it back
else if (widget.text.length > 25 && textToDisplay.length > 25) {
setState(() {
textToDisplay = widget.text.substring(0,25)+"...";
});
}
},
);
}
}
I'm building a Workout Tracker app using Flutter and Dart. On the tracking page are lists of exercises and a done Icon, when clicked, changes its color(To show that you're done with the set). Icon state changes locally in the file.
So the problem is when I scroll down, the upper items revert back to their original state. Long story short, I don't want the icons to Rerender on demand and save their state until I want to.
Tried AutomaticKeepAliveStateMixin but it doesn't seem to be working. I'm a newbie in coding so maybe I am implementing it wrong.
class _ExerciseInputState extends State<ExerciseInput>
with AutomaticKeepAliveClientMixin {
#override
bool get wantKeepAlive => true;
#override
Widget build(BuildContext context) {
super.build(context);
var deviceSize = MediaQuery.of(context).size;
return ListView.builder(
itemCount: widget.loadedRoutine.exercises.length,
itemBuilder: (BuildContext context, int i) {
return buildExerciseContainer(
widget.loadedRoutine.exercises[i].title,
widget.loadedRoutine.exercises[i].sets,
widget.loadedRoutine.exercises[i].reps,
deviceSize,
context);
},
);
}
}
No error messages.