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I am new to flutter and trying to develop a version updation software. I need to show the version in a radio list. Is there any way to contain the list view in a container? Currently the list view is overflowing through the other widgets. I need to contain the list view between the text and the button. Is there any way to do it.The code the screenshot is given below
[![screenshot][1]][1]
Widget _createVersionRadioTiles(List<String> versions) {
var radioTiles = <Widget>[];
for (var version in versionList) {
var tile = Padding(
padding: const EdgeInsets.all(8.0),
child: RadioListTile<String>(
selected: selectedVersion == version,
tileColor: colorDarkGray,
// selectedTileColor: Colors.white,
value: version,
groupValue: selectedVersion,
onChanged: (String? value) {
setState(() {
selectedVersion = value!.toString();
});
},
title: Text(version),
),
);
radioTiles.add(tile);
}
return Column(
children: [
SizedBox(
height: 500,
width: 500,
child: ListView(children: radioTiles),
)
],
);
} ```
[1]: https://i.stack.imgur.com/qQxns.jpg
Wrap the RadioListTile with a Card widget. It will contain the ListTile in the container.
You can replace SizedBox with Container, and use clipBehavior: Clip.hardEdge to remove the overflows. see code below:
return Column(
children: [
Container(
height: 500,
width: 500,
clipBehavior: Clip.hardEdge,
child: ListView(children: radioTiles),
)
],
);
I have List View and I have inside each item in the list a button called "Delete item". When I press that button inside each item I want to delete only that item from the list.
But it does not delete item, it just display Toast message that I have specified.
How I can solve this?
This is the code:
Widget build(BuildContext context) {
listItems = buildVCsFromAPI(context);
return Container(
child: ListView.builder(
itemBuilder: (context, index) =>
_buildListItem(context, listItems[index], index),
itemCount: listItems.length,
physics: AlwaysScrollableScrollPhysics()),
);
}
Widget _buildListItem(
BuildContext context, _VerifiableCredentialListItem cert, int index) {
return GestureDetector(
child: AnimatedAlign(
curve: Curves.ease,
duration: Duration(milliseconds: 500),
heightFactor: selectedPosition == index ? factorMax : factorMin,
alignment: Alignment.topCenter,
child: Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.all(Radius.circular(10)), //here
color: Colors.white,
boxShadow: [
BoxShadow(
color: Colors.grey.withOpacity(0.5),
offset: Offset(0, -1),
blurRadius: 10.0)
]),
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
HeadingRow(title: cert.fullTitle, appIcon: cert.appIcon),
displayListItem(index, selectedPosition, cert)
],
),
),
),
}
Column displayListItem(
int index, int selectedIndex, _VerifiableCredentialListItem cert) {
CredentialListGroupType groupType = cert.groupType;
return Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
SizedBox(
height: UIConstants.s2,
),
buildAnotherWidget(),
SizedBox(
height: UIConstants.s3,
),
buildDeleteAndExportButtons(),
],
);
}
Column buildDeleteAndExportButtons() {
return Column(
children: [
Padding(
padding: EdgeInsets.symmetric(
vertical: UIConstants.s1, horizontal: UIConstants.s2),
child: Row(
children: [
Expanded(
flex: 1,
child: BlueButtonWithIcon(
text: 'Delete item',
icon: 'assets/icons/delete-icon.svg',
onPressed: () {
setState(() {
AppToaster.pop(ToasterType.info, "Delete");
listItems.removeAt(0);
});
},
),
),
SizedBox(width: UIConstants.s1),
Expanded(
flex: 1,
child: BlueButtonWithIcon(
text: 'Export',
icon: 'assets/icons/export.svg',
onPressed: null,
),
)
],
),
),
SizedBox(height: UIConstants.s1)
],
);
}
Calling setState doesn't mean that flutter would actually full repaint the screen it means that it will check your widget tree with the last rendered widget tree and it will paint only the differences and it first compares widgets type and then widget keys to find that there is a difference between the current widget and the previous one and because of this when you remove an item from your list of items flutter checks your returned widgets to the currently rendered widget it doesn't found any difference and it won't repaint the screen and continues showing the last render
So for you to tell the flutter that one of the items in the listView is changed you could assign a uniqueKey key for each list item widget note that for this topic your keys should be unique to the data of that widget otherwise you will face performance issues because if your widget key is changed without any change in the representation of that widget in next time that builds method is called which could happen frequently flutter compares widgets key with the previous widgets key which is rendered to the screen and exist on the render tree and it founds that the keys are different and it repaints that widget which is a redundant operation because your widgets UI and representation are the same
For example, assign a unique id base on the index or content of your data to each data model in the listItems and use that to create a ValueKey() for the widget that is represented by that data
here is a working example of the list which when you click on the list item first list item will be removed
class ListItemDataModel {
final String id;
final Color color;
ListItemDataModel(this.id, this.color);
}
class _MyHomePageState extends State<MyHomePage> {
List<ListItemDataModel> items = [];
#override
void initState() {
super.initState();
items = [
ListItemDataModel("A", Colors.red),
ListItemDataModel("B", Colors.amber),
ListItemDataModel("C", Colors.green),
ListItemDataModel("D", Colors.lightBlueAccent),
ListItemDataModel("E", Colors.pink),
];
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Container(
child: ListView.builder(
itemBuilder: (context, index) {
return GestureDetector(
key: ValueKey(items[index].id),
//Tap to Remove first item from list
onTap: () {
items.removeAt(0);
setState(() {});
},
child: Container(
height: 60,
color: items[index].color,
child: Center(
child: Text(
"This is a unique item with id = ${items[index].id}"),
),
),
);
},
itemCount: items.length,
),
),
);
}
}
So,
We don't have acces to the code above.. so.. where does listItems came from?
Maybe you are retrieving the value of listItems after the init state? if so it's normal that you are retrieving always the same result..
What you should do is the following:
get listItems value from params, global vars, databse ecc
display the list
when you delete a single item you should update the original list
on state updated now the list will be loaded with updated values
If you delete an item from a list but the list is then reloaded in its original form your updates will be lost
I have a SingleChildScrollView and inside it I have a list with some cards, that you can remove ou add more. I need to fix an add button at the bottom of the screen, when the card list is not scrollable yet, but when the card list increase size and the scrollview is able to scroll now (to see all the content), the button must follow the list and not keep fixed at the bottom anymore.
For now, what I did to solve this, was check the scroll view every time that a card is added ou removed, if I checked that the screen is now scrollable or not scrollable I change some properties of my build widget:
SingleChildScrollView(
controller: _scrollController,
physics: AlwaysScrollableScrollPhysics(),
child: Container(
height: isNotScrollable
? _pageSize - (_appBarSize + _notifySize)
: null,
padding: const EdgeInsets.symmetric(
horizontal: Constraints.paddingNormal),
child: Column(
.....
and after the list render I create the button like this
isNotScrollable
? Expanded(
child: Container(),
)
: Container(),
CVButton(
color: Palette.white,
Basically, my idea is: if the screen is not scrollable yet (the list content fits in the screen size) I will set a height to the container inside scrollview and add a Expanded() widget before the add button (so the button will stay in the bottom of the container), but if the screen is scrollable (the list content not fits inside the screen size) so I remove the container height and the Expanded widget, then the button will follow the list now as normally.
I don't know if this is the better way to deal with that, I want to know if there is some way to do this without this 'dinamic' way that I am doing, only with fixed widgets and not changing the widget according to the state of the scrollview.
An example when the list becomes scrollable and the button will keep at list bottom
Here the list is not scrollable yet but the button must be at the screen bottom and not list bottom
(I dont wanna use bottomNavBar)
Anyone has any idea how I can solve this?
I have a solution for this. check the code bellow. I added some buttons to add or remove cards. The main trick is to use constraints like minHeight.
import 'package:flutter/material.dart';
class BottomButton extends StatefulWidget {
#override
_BottomButtonState createState() => _BottomButtonState();
}
class _BottomButtonState extends State<BottomButton> {
List<Widget> cards = [];
#override
Widget build(BuildContext context) {
var appBar2 = AppBar(
actions: [
IconButton(
icon: Icon(Icons.add),
onPressed: () {
_addCard();
}),
IconButton(
icon: Icon(Icons.remove),
onPressed: () {
_removeCard();
}),
],
);
return Scaffold(
appBar: appBar2,
body: Container(
height: MediaQuery.of(context).size.height -
(MediaQuery.of(context).padding.top + appBar2.preferredSize.height),
alignment: Alignment.topCenter,
child: ListView(
primary: true,
children: [
Container(
constraints: BoxConstraints(
minHeight: MediaQuery.of(context).size.height -
(MediaQuery.of(context).padding.top +
appBar2.preferredSize.height),
),
alignment: Alignment.topCenter,
child: Column(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Container(
constraints: BoxConstraints(
minHeight: MediaQuery.of(context).size.height -
(MediaQuery.of(context).padding.top +
appBar2.preferredSize.height +
50),
),
alignment: Alignment.topCenter,
child: Column(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.start,
children: cards,
),
),
ElevatedButton(
child: Text('this is a button'),
onPressed: () {},
),
],
),
)
],
),
),
);
}
void _addCard() {
Widget card = Card(
child: Container(
height: 100,
color: Colors.red,
padding: EdgeInsets.all(2),
),
);
setState(() {
cards.add(card);
});
}
void _removeCard() {
setState(() {
cards.removeLast();
});
}
}
I display a custom-made bottom app bar in a Stack because of keyboard padding reasons. The custom widget is fully opaque as it should be until it's a child of a Stack in which case, the content behind it starts to be visible since the color's opacity somehow changes.
As you can see, it's only the "main" color that's transparent. Icons remain opaque.
This is the build method of my custom BottomBar widget which is then just regularly put into a Stack. I have tried using a Material and even a simple Container in place of the BottomAppBar widget but the results are the same.
#override
Widget build(BuildContext context) {
return BottomAppBar(
color: Colors.blue.withOpacity(1),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
IconButton(
icon: Icon(MdiIcons.plusBoxOutline),
onPressed: () {},
),
Text('Edited 11:57'),
IconButton(
icon: Icon(MdiIcons.dotsVertical),
onPressed: () {},
),
],
),
);
}
Can you interact with the BottomAppBar ? It looks like an order problem. Try to put the BottomAppBar as last in the Stack children.
Note that BottomAppBar doesn't have a constant size, if you did not add it to Scaffold bottomNavigationBar named parameter has a size if this is not null. Below is peace of code in Scaffold dart file:
double bottomNavigationBarTop;
if (hasChild(_ScaffoldSlot.bottomNavigationBar)) {
final double bottomNavigationBarHeight = layoutChild(_ScaffoldSlot.bottomNavigationBar, fullWidthConstraints).height;
bottomWidgetsHeight += bottomNavigationBarHeight;
bottomNavigationBarTop = math.max(0.0, bottom - bottomWidgetsHeight);
positionChild(_ScaffoldSlot.bottomNavigationBar, Offset(0.0, bottomNavigationBarTop));
}
You can even develop your own Widget without BottomAppBar but if you want things like centerDocked and things like circular notched, you will have to do more stuff (anyway you have flexibility to custom design the way you want).
Here is a simple example to do that(one way to do that):
import 'package:flutter/material.dart';
class CustomBottomBar extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Stack(
children: <Widget>[
Container(
margin: EdgeInsets.only(bottom: 50),
color: Colors.greenAccent, // if you want this color under bottom bar add the margin to list view
child: ListView.builder(
itemCount: 100,
itemBuilder: (_, int index) => Text("Text $index"),
),
),
Positioned(
bottom: 0,
child: Container(
color: Colors.amber.withOpacity(.5),
width: MediaQuery.of(context).size.width,
height: 50,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: List.generate(4, (int index) => Text("Text $index")), // you can make these clickable by wrapping with InkWell or any gesture widget
),
),
),
],
),
);
}
}
I'm working on my first Flutter app (debugging on my Android phone). I have a list with row items. When you long-press the row, it copies the content into the user's clipboard. This is working great!
But I need to let the user know that the content was copied.
I've attempted to follow many tutorials on trying to get the row surrounded by a build method or inside a Scaffold, but I can't get any to work. Is there an alternative method to notifying the user (simply) that something like "Copied!" took place?
Notice the commented out Scaffold.of(... below. It just seems like there must be an easier method to notifying the user other than wrapping everything in a Scaffold. (and when I try, it breaks my layout).
import 'package:flutter/material.dart';
import 'package:my_app/Theme.dart' as MyTheme;
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/services.dart';
class RowRule extends StatelessWidget {
final DocumentSnapshot ruleGroup;
RowRule(this.ruleGroup);
_buildChildren() {
var builder = <Widget>[];
if (!ruleGroup['label'].isEmpty) {
builder.add(new Text(ruleGroup['label'],
style: MyTheme.TextStyles.articleContentLabelTextStyle));
}
if (!ruleGroup['details'].isEmpty) {
builder.add(new Text(ruleGroup['details'],
style: MyTheme.TextStyles.articleContentTextStyle));
}
return builder;
}
#override
Widget build(BuildContext context) {
return new GestureDetector(
onLongPress: () {
Clipboard.setData(new ClipboardData(text: ruleGroup['label'] + " " + ruleGroup['details']));
// Scaffold.of(context).showSnackBar(SnackBar
// (content: Text('text copied')));
},
child: Container(
margin: const EdgeInsets.symmetric(vertical: 3.0),
child: new FlatButton(
color: Colors.white,
padding: EdgeInsets.symmetric(horizontal: 0.0),
child: new Stack(
children: <Widget>[
new Container(
margin: const EdgeInsets.symmetric(
vertical: MyTheme.Dimens.ruleGroupListRowMarginVertical),
child: new Container(
child: Padding(
padding: EdgeInsets.symmetric(horizontal: 32.0, vertical: 8.0),
child: new Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: _buildChildren(),
),
)),
)
],
),
),
));
}
}
The goal is to have a page like this (see image), which I have, and it works and scrolls...etc, but I cannot get it to work with a Scaffold, and therefore, haven't been able to use the snackbar. Each "Row" (which this file is for) should show a snackbar on longPress.
You can use GlobalKey to make it work the way you want it.
Since I don't have access to your database stuff, this is how I gave you an idea to do it. Copy and paste this code in your class and make changes accordingly. I also believe there is something wrong in your RowRule class, can you just copy the full code I have given you and run?
void main() => runApp(MaterialApp(home: HomePage()));
class HomePage extends StatelessWidget {
final GlobalKey<ScaffoldState> _key = GlobalKey();
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Color(0xFFFFFFFF).withOpacity(0.9),
key: _key,
body: Column(
children: <Widget>[
Container(
color: Color.fromRGBO(52, 56, 245, 1),
height: 150,
alignment: Alignment.center,
child: Container(width: 56, padding: EdgeInsets.only(top: 12), decoration: BoxDecoration(shape: BoxShape.circle, color: Colors.yellow)),
),
Expanded(
child: ListView.builder(
padding: EdgeInsets.zero,
itemCount: 120,
itemBuilder: (context, index) {
return Container(
color: Colors.white,
margin: const EdgeInsets.all(4),
child: ListTile(
title: Text("Row #$index"),
onLongPress: () => _key.currentState
..removeCurrentSnackBar()
..showSnackBar(SnackBar(content: Text("Copied \"Row #$index\""))),
),
);
},
),
),
],
),
);
}
}
These is a simple plugin replacement for the Snackbar named "Flushbar".
You can get the plugin here - https://pub.dartlang.org/packages/flushbar
You don't have to take care of any wrapping of widgets into scaffold also you get a lot of modifications for you like background gradient, adding forms and so on into Snackbar's and all.
Inside your onLongPressed in GestureDetectore you can do this.
onLongPressed:(){
Clipboard.setData(new ClipboardData(text: ruleGroup['label'] + " " + ruleGroup['details']));
Flushbar(
message: "Copied !!",
duration: Duration(seconds: 3),
)..show(context);
}
This will display the snackbar in you app where you would want to see it also you can get a lot of modification available to you so the you can make it look as per your app.
There are couple of things you need to do, like use onPressed property of the FlatButton it is mandatory to allow clicks, wrap your GestureDetector in a Scaffold. I have further modified the code so that it uses GlobalKey to make things easy for you.
Here is the final code (Your way)
class RowRule extends StatelessWidget {
final GlobalKey<ScaffoldState> globalKey = GlobalKey();
final DocumentSnapshot ruleGroup;
RowRule(this.ruleGroup);
_buildChildren() {
var builder = <Widget>[];
if (!ruleGroup['label'].isEmpty) {
builder.add(new Text(ruleGroup['label'], style: MyTheme.TextStyles.articleContentLabelTextStyle));
}
if (!ruleGroup['details'].isEmpty) {
builder.add(new Text(ruleGroup['details'], style: MyTheme.TextStyles.articleContentTextStyle));
}
return builder;
}
#override
Widget build(BuildContext context) {
return Scaffold(
key: globalKey,
body: GestureDetector(
onLongPress: () {
Clipboard.setData(new ClipboardData(text: ruleGroup['label'] + " " + ruleGroup['details']));
globalKey.currentState
..removeCurrentSnackBar()
..showSnackBar(SnackBar(content: Text('text copied')));
},
child: Container(
margin: const EdgeInsets.symmetric(vertical: 3.0),
child: new FlatButton(
onPressed: () => print("Handle button press here"),
color: Colors.white,
padding: EdgeInsets.symmetric(horizontal: 0.0),
child: new Stack(
children: <Widget>[
new Container(
margin: const EdgeInsets.symmetric(vertical: MyTheme.Dimens.ruleGroupListRowMarginVertical),
child: new Container(
child: Padding(
padding: EdgeInsets.symmetric(horizontal: 32.0, vertical: 8.0),
child: new Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: _buildChildren(),
),
),
),
)
],
),
),
),
),
);
}
}
I made a dropdown banner package on pub that allows you to easily notify users of errors or confirmation of success. It's a work in progress as I continue to add visually rich features.
I am not sure if your build() method is completed or you are yet to change it, because it consist of many widgets which are just redundant. Like there is no need to have Container in Container and further Padding along with a FlatButton which would make complete screen clickable. Also having Column won't be a good idea because your screen may overflow if you have more data. Use ListView instead.
So, if you were to take my advice, use this simple code that should provide you what you are really looking for. (See the build() method is of just 5 lines.
class RowRule extends StatelessWidget {
final GlobalKey<ScaffoldState> globalKey = GlobalKey();
final DocumentSnapshot ruleGroup;
RowRule(this.ruleGroup);
_buildChildren() {
var builder = <Widget>[];
if (!ruleGroup['label'].isEmpty) {
builder.add(
ListTile(
title: Text(ruleGroup['label'], style: MyTheme.TextStyles.articleContentLabelTextStyle),
onLongPress: () {
globalKey.currentState
..removeCurrentSnackBar()
..showSnackBar(SnackBar(content: Text("Clicked")));
},
),
);
}
if (!ruleGroup['details'].isEmpty) {
builder.add(
ListTile(
title: Text(ruleGroup['details'], style: MyTheme.TextStyles.articleContentTextStyle),
onLongPress: () {
globalKey.currentState
..removeCurrentSnackBar()
..showSnackBar(SnackBar(content: Text("Clicked")));
},
),
);
}
return builder;
}
#override
Widget build(BuildContext context) {
return Scaffold(
key: globalKey,
body: ListView(children: _buildChildren()),
);
}
}
I read your comments on all answers and here is my conslusion:
You need ScaffoldState object that is just above the widget in tree to show Snackbar. You can either get it through GlobalKey as many have suggested. Fairly simple if the Scaffold is created inside build of the widget, but if it is outside the widget (in your case) then it becomes complicated. You need to pass that key, wherever you need it through Constructor arguments of child widgets.
Scaffold.of(context) is a very neat way to just do that. Just like an InheritedWidget, Scaffold.of(BuildContext context) gives you access of the closest ScaffoldState object above the tree. Else it could be a nightmare to get that instance (by passing it through as constructor arguments) if your tree was very deep.
Sorry, to disappoint but I don't think there is any better or cleaner method than this, if you want to get the ScaffoldState that is not built inside build of that widget. You can call it in any widget that has Scaffold as a parent.