Related
I have an application like this:
My aim is that when I press the eye icon next to the text "Hello", I want a box to open just below the text and write the German version of "Hello". So it will say "Hallo".
My purpose is to show the meaning of the word.
When I press the eye, I want to show the German of the word. How can I make a white box under the word Hello, that is, the box in which the German language will be written?
Codes:
import 'package:flutter/material.dart';
import 'package:carousel_slider/carousel_slider.dart';
class selamlasmaLearn extends StatelessWidget {
List <wordAndMeaning> wordsList = [wordAndMeaning("Hello", "Hallo"), wordAndMeaning("Go", "Gehen")];
#override
Widget build(BuildContext context) {
return Scaffold(
body: Builder(
builder: (context) {
final double height = MediaQuery.of(context).size.height;
return CarouselSlider(
options: CarouselOptions(
height: height,
viewportFraction: 1.0,
enlargeCenterPage: false,
),
items: wordsList.map((wordAndMeaning word) {
return Builder(
builder: (BuildContext context) {
return Container(
width: MediaQuery.of(context).size.width,
decoration: BoxDecoration(color: Colors.amber),
child: Center(
child: Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
word.word,
style: TextStyle(fontSize: 45, color: Colors.white),
),
SizedBox(width: 10,),
Icon(Icons.remove_red_eye_sharp, color: Colors.white, size: 25,), // <<<<<<<<<
],
),
),
);
},
);
}).toList(),
);
}
),
);
}
}
class wordAndMeaning {
String word;
String meaning;
wordAndMeaning(this.word, this.meaning);
}
I keep the word and its German in a list called wordsList.
Thanks for the help in advance.
You can convert the widget to StatefulWidget or use a ValueNotifier to control the preserve/notify the state visibility.
You can use Visibility widget or just if to show and hide German text.
class selamlasmaLearn extends StatefulWidget {
#override
State<selamlasmaLearn> createState() => _selamlasmaLearnState();
}
class _selamlasmaLearnState extends State<selamlasmaLearn> {
bool _showGerman = false;
List<wordAndMeaning> wordsList = [
wordAndMeaning("Hello", "Hallo"),
wordAndMeaning("Go", "Gehen")
];
#override
Widget build(BuildContext context) {
return Scaffold(
body: Builder(builder: (context) {
final double height = MediaQuery.of(context).size.height;
return CarouselSlider(
options: CarouselOptions(
height: height,
viewportFraction: 1.0,
enlargeCenterPage: false,
),
items: wordsList.map((wordAndMeaning word) {
return Builder(
builder: (BuildContext context) {
return Container(
width: MediaQuery.of(context).size.width,
decoration: BoxDecoration(color: Colors.amber),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: [
Column(
mainAxisSize: MainAxisSize.min,
children: [
Text(word.word,
style:
TextStyle(fontSize: 45, color: Colors.white)),
if (_showGerman) Text(word.meaning), //modify the way you want
],
),
const SizedBox(
width: 10,
),
IconButton(
icon: Icon(Icons.remove_red_eye_sharp),
color: Colors.white,
iconSize: 25,
onPressed: () {
setState(() {
_showGerman = !_showGerman;
});
},
),
],
),
);
},
);
}).toList(),
);
}),
);
}
}
Use the Tooltip widget
I'm emphasizing on the popup part in your question title. When using a Tooltip you ensure that your widgets do not shift position or jump when the Tooltip widget appear, as the example below illustrates.
Example code:
import 'package:flutter/material.dart';
class TooltipExample extends StatelessWidget {
const TooltipExample({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Tooltip(
// Set the tooltip to trigger on a single tap, tapping outside the
// widget will make the tooltip disappear.
triggerMode: TooltipTriggerMode.tap,
// The message shown when the tooltip appears.
message: "Tooltip showing!",
// Consider adjusting this to your needs.
showDuration: const Duration(days: 1),
// The widget that must be clicked to show the tooltip.
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
mainAxisSize: MainAxisSize.min,
children: const [
Text("Hello"),
SizedBox(
width: 8,
),
Icon(Icons.visibility),
],
),
),
),
const Padding(
padding: EdgeInsets.all(8.0),
child: Text("Cover me!"),
)
],
),
);
}
}
// Some code to run the above example, note the theme part that turns the
// tooltip white.
class App extends StatelessWidget {
const App({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return MaterialApp(
// Style the overall design of tooltips in the app in one place,
// or provide in each tooltip individually.
theme: ThemeData(
tooltipTheme: const TooltipThemeData(
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(
Radius.circular(4),
),
),
textStyle: TextStyle(
backgroundColor: Colors.white,
color: Colors.black,
),
),
),
home: const Scaffold(
backgroundColor: Colors.amber,
body: TooltipExample(),
),
);
}
}
void main() => runApp(const App());
Here is how it looks:
Note that the Tooltip widget overlays whatever is below it. (instead of pushing it further down - like toggling the visibility of a normal widget in a row or column would have done)
i have setup banner ads in flutter and those are overlapping the bottom navigation bar
I want to display ads below that bottom navigation bar,
is there any way that i can add a margin below the bottom navigation bar ?
i have implemented ads in home.dart (mainpage)
import 'package:provider/provider.dart';
import '../../ui/widgets/bottom_nav_bar.dart';
import '../../core/utils/theme.dart';
import 'search_page.dart';
import 'category.dart';
import 'main_page.dart';
import 'settings.dart';
import 'package:flutter/material.dart';
import 'package:firebase_admob/firebase_admob.dart';
import 'for_you.dart';
const String AD_MOB_APP_ID = 'ca-app-pub-3940256099942544~3347511713';
const String AD_MOB_TEST_DEVICE = 'DEC3010B2445165B43EB949F5D97D0F8 - run ad then check device logs for value';
const String AD_MOB_AD_ID = 'ca-app-pub-3940256099942544/6300978111';
class HomePage extends StatefulWidget {
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
BannerAd _bannerAd;
static final MobileAdTargetingInfo targetingInfo = new MobileAdTargetingInfo(
testDevices: <String>[AD_MOB_TEST_DEVICE],
);
BannerAd createBannerAd() {
return new BannerAd(
adUnitId: AD_MOB_AD_ID,
size: AdSize.banner,
targetingInfo: targetingInfo,
);
}
final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
int _selectedIndex = 0;
final PageController _pageController = PageController();
#override
void initState() {
super.initState();
}
#override
void dispose() {
super.dispose();
_pageController.dispose();
}
#override
Widget build(BuildContext context) {
final stateData = Provider.of<ThemeNotifier>(context);
final ThemeData state = stateData.getTheme();
FirebaseAdMob.instance.initialize(appId: AD_MOB_APP_ID);
_bannerAd = createBannerAd()..load()..show();
return Scaffold(
key: _scaffoldKey,
appBar: AppBar(
centerTitle: false,
backgroundColor: state.primaryColor,
elevation: 0,
title: Text(
'RevWalls',
style: state.textTheme.headline,
),
actions: <Widget>[
IconButton(
icon: Icon(
Icons.search,
color: state.textTheme.body1.color,
),
onPressed: () => showSearch(
context: context, delegate: WallpaperSearch(themeData: state)),
)
],
),
body: Container(
color: state.primaryColor,
child: PageView(
controller: _pageController,
physics: BouncingScrollPhysics(),
onPageChanged: (index) {
setState(() {
_selectedIndex = index;
});
},
children: <Widget>[
MainBody(),
Category(),
ForYou(),
SettingsPage(),
],
),
),
bottomNavigationBar: BottomNavyBar(
selectedIndex: _selectedIndex,
unselectedColor: state.textTheme.body1.color,
onItemSelected: (index) {
_pageController.jumpToPage(index);
},
selectedColor: state.accentColor,
backgroundColor: state.primaryColor,
showElevation: false,
items: [
BottomNavyBarItem(
icon: Icon(Icons.home),
title: Text('Home'),
),
BottomNavyBarItem(
icon: Icon(Icons.category),
title: Text('Subreddits'),
),
BottomNavyBarItem(
icon: Icon(Icons.phone_android),
title: Text('Exact Fit'),
),
BottomNavyBarItem(
icon: Icon(Icons.settings),
title: Text('Settings'),
),
],
),
);
}
Widget oldBody(ThemeData state) {
return NestedScrollView(
headerSliverBuilder: (BuildContext context, bool boxIsScrolled) {
return <Widget>[
SliverAppBar(
backgroundColor: state.primaryColor,
elevation: 4,
title: Text(
'reWalls',
style: state.textTheme.headline,
),
actions: <Widget>[
IconButton(
icon: Icon(Icons.search, color: state.accentColor),
onPressed: () {
showSearch(
context: context,
delegate: WallpaperSearch(themeData: state));
},
)
],
floating: true,
pinned: _selectedIndex == 0 ? false : true,
snap: false,
centerTitle: false,
),
];
},
body: Container(
color: state.primaryColor,
child: PageView(
controller: _pageController,
onPageChanged: (index) {
setState(() {
_selectedIndex = index;
});
},
children: <Widget>[
MainBody(),
Category(),
ForYou(),
SettingsPage(),
],
),
),
);
}
}
and here is the bottom navigation bar -
library bottom_navy_bar;
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
class BottomNavyBar extends StatelessWidget {
final int selectedIndex;
final double iconSize;
final Color backgroundColor, selectedColor, unselectedColor;
final bool showElevation;
final Duration animationDuration;
final List<BottomNavyBarItem> items;
final ValueChanged<int> onItemSelected;
BottomNavyBar(
{Key key,
this.selectedIndex = 0,
this.showElevation = true,
this.iconSize = 20,
this.backgroundColor,
this.selectedColor,
this.unselectedColor,
this.animationDuration = const Duration(milliseconds: 250),
#required this.items,
#required this.onItemSelected}) {
assert(items != null);
assert(items.length >= 2 && items.length <= 5);
assert(onItemSelected != null);
}
Widget _buildItem(BottomNavyBarItem item, bool isSelected) {
return AnimatedContainer(
width: isSelected ? 120 : 50,
height: double.maxFinite,
duration: animationDuration,
decoration: BoxDecoration(
color: isSelected ? selectedColor.withOpacity(0.2) : backgroundColor,
borderRadius: BorderRadius.all(Radius.circular(100.0)),
),
alignment: Alignment.center,
child: ListView(
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
scrollDirection: Axis.horizontal,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Padding(
padding: const EdgeInsets.only(right: 8),
child: IconTheme(
data: IconThemeData(
size: iconSize,
color: isSelected ? selectedColor : unselectedColor),
child: item.icon,
),
),
isSelected
? DefaultTextStyle.merge(
style: TextStyle(
fontSize: 16,
color: selectedColor,
fontWeight: FontWeight.bold),
child: item.title,
)
: SizedBox.shrink()
],
)
],
),
);
}
#override
Widget build(BuildContext context) {
return Container(
color: backgroundColor,
child: Container(
width: double.infinity,
height: 55,
padding: EdgeInsets.all(8),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: items.map((item) {
var index = items.indexOf(item);
return GestureDetector(
onTap: () {
onItemSelected(index);
},
child: _buildItem(item, selectedIndex == index),
);
}).toList(),
),
),
);
}
}
class BottomNavyBarItem {
final Icon icon;
final Text title;
BottomNavyBarItem({
#required this.icon,
#required this.title,
}) {
assert(icon != null);
assert(title != null);
}
}
Please help
adding builder like this will solve the problem
var paddingBottom = 60.0;
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
//
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'World General info',
//theme: ThemeData(primarySwatch: Colors.cyan,),
theme: ThemeData(
primaryColor: Colors.cyan,
accentColor: Colors.green,
textTheme: TextTheme(bodyText2: TextStyle(color: Colors.purple)),
),
home: MyHomePage(title: 'World General Info'),
builder: (BuildContext context, Widget child) {
return new Padding(
child: child,
padding: EdgeInsets.only(bottom: paddingBottom),
);
}
);
}
}
You can use the MediaQuery.of(context) for that.
Wrap the whole Code inside a Container of height: MediaQuery.of(context).size.height - 60 . (the height of ad)
Column(
children: [
Container(
height: MediaQuery.of(context).size.height - 60,
child: HomePage(),
),
BannerAd(),
]
);
Found answer myself
We can use this to set margin in a container with other things like height, width
This code will add margin to bottom of bottom nav bar, as per my need i want to show ads below navbar so this solves my problem
margin: const EdgeInsets.only(bottom: 50)
Add this to your scaffold
bottomNavigationBar: Container(
height: 50.0,
color: Colors.white,
),
Think Simplest bro ... wrap your column ( mainAxisSize : MainAxisSize.min )
Scaffold(
appBar: _appBar,
body: _body,
bottomNavigationBar: Column(
mainAxisAlignment: MainAxisAlignment.end,
mainAxisSize: MainAxisSize.min,
children: [
Container(
color: Colors.amber,
height: 70,
child: Center(child: Text('Banner'))),
BottomNavigationBar(
items: const [
BottomNavigationBarItem(icon: Icon(Icons.add), label: 'Add'),
BottomNavigationBarItem(icon: Icon(Icons.add), label: 'Add'),
BottomNavigationBarItem(icon: Icon(Icons.add), label: 'Add')
],
)
]))
I want to create a horizontal stepper, which is easy I know, but this time, the count of steps should large.
Just to give an example, this is what I am doing for the vertical,
import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new HomePage(),
);
}
}
class HomePage extends StatelessWidget{
#override
Widget build(BuildContext context) {
return new Scaffold(
body: Container(
margin: EdgeInsets.symmetric(vertical: 20.0),
child: new ListView(
children: <Widget>[
new Text("Helllo "),
new Text( " Welcome"),
new Text (" Yaaa0"),
new SimpleWidget(),
],
), ),
);
}
}
class SimpleWidget extends StatefulWidget {
#override
SimpleWidgetState createState() => new SimpleWidgetState();
}
class SimpleWidgetState extends State<SimpleWidget> {
int stepCounter = 0;
List<Step> steps = [];
#override
void initState() {
prepareState();
super.initState();
}
void prepareState(){
for (var i= 0; i<100; i++){
var stepVal = new Step(
title:new Text("Step $i"),
content: new Text("This is the child of $i step"),
isActive: true,
);
steps.add(stepVal);
}
}
#override
Widget build(BuildContext context) {
return new Container(
child: new Stepper(
type: StepperType.vertical,
physics : ClampingScrollPhysics(),
currentStep: this.stepCounter,
steps: steps,
onStepTapped: (step) {
setState(() {
stepCounter = step;
});
},
onStepCancel: () {
setState(() {
stepCounter > 0 ? stepCounter -= 1 : stepCounter = 0;
});
},
onStepContinue: () {
setState(() {
stepCounter < steps.length - 1 ? stepCounter += 1 : stepCounter = 0;
});
},
),
);
}
}
As soon as I try to recreate this in the horizontal mode, it shows nothing. I have tried to make the listView horizontal, I have tried to make the stepper horizontal, both individually and also together. None works. You can try that in the dartpad.
My question :
1. How to make a Stepper in horizontal that is scrollable in the horizontal mode.
2. The content of the Stepper is scrollable , I can see that. Can it be switched off?
use this class
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:hexcolor/hexcolor.dart';
class StepProgressView extends StatelessWidget {
final double _width;
final List<String> _titles;
final int _curStep;
final Color _activeColor;
final Color _inactiveColor = HexColor("#E6EEF3");
final double lineWidth = 3.0;
StepProgressView(
{Key key,
#required int curStep,
List<String> titles,
#required double width,
#required Color color})
: _titles = titles,
_curStep = curStep,
_width = width,
_activeColor = color,
assert(width > 0),
super(key: key);
Widget build(BuildContext context) {
return Container(
width: this._width,
child: Column(
children: <Widget>[
Row(
children: _iconViews(),
),
SizedBox(
height: 8,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: _titleViews(),
),
],
));
}
List<Widget> _iconViews() {
var list = <Widget>[];
_titles.asMap().forEach((i, icon) {
var circleColor = (i == 0 || _curStep > i + 1) ? _activeColor : _inactiveColor;
var lineColor = _curStep > i + 1 ? _activeColor : _inactiveColor;
var iconColor = (i == 0 || _curStep > i + 1) ? _activeColor : _inactiveColor;
list.add(
Container(
width: 20.0,
height: 20.0,
padding: EdgeInsets.all(0),
decoration: new BoxDecoration(
/* color: circleColor,*/
borderRadius: new BorderRadius.all(new Radius.circular(22.0)),
border: new Border.all(
color: circleColor,
width: 2.0,
),
),
child: Icon(
Icons.circle,
color: iconColor,
size: 12.0,
),
),
);
//line between icons
if (i != _titles.length - 1) {
list.add(Expanded(
child: Container(
height: lineWidth,
color: lineColor,
)));
}
});
return list;
}
List<Widget> _titleViews() {
var list = <Widget>[];
_titles.asMap().forEach((i, text) {
list.add(Text(text, style: TextStyle(color: HexColor("#000000"))));
});
return list;
}
}
declare list and int variable inside class you want to use
final List<String> titles = [TextConstant.CART, TextConstant.ADDRESS, TextConstant.PAYMENT];
int _curStep = 1;
finally use above class
StepProgressView(width: MediaQuery.of(context).size.width,
curStep: _curStep,
color: Color(0xff50AC02),
titles: titles),
try this example, e.g: conf pubspec file: fa_stepper: ^0.0.2, then flutter packages get , after that: using FAStepper constructor, define something like this:
Widget w1(BuildContext context) {
return Scaffold(
// Body
body: Container(
child: FAStepper(
// physics: ClampingScrollPhysics(),
// Using a variable here for handling the currentStep
currentStep: this.currentStep,
// List the steps you would like to have
titleHeight: 120,
steps: mySteps,
// Define the type of Stepper style
// StepperType.horizontal : Horizontal Style
// StepperType.vertical : Vertical Style
type: FAStepperType.horizontal,
titleIconArrange: FAStepperTitleIconArrange.column,
stepNumberColor: Colors.pinkAccent,
// Know the step that is tapped
onStepTapped: (step) {
// On hitting step itself, change the state and jump to that step
setState(() {
// update the variable handling the current step value
// jump to the tapped step
currentStep = step;
});
// Log function call
print("onStepTapped : " + step.toString());
},
onStepCancel: () {
// On hitting cancel button, change the state
setState(() {
// update the variable handling the current step value
// going back one step i.e subtracting 1, until its 0
if (currentStep > 0) {
currentStep = currentStep - 1;
} else {
currentStep = 0;
}
});
// Log function call
print("onStepCancel : " + currentStep.toString());
},
// On hitting continue button, change the state
onStepContinue: () {
setState(() {
// update the variable handling the current step value
// going back one step i.e adding 1, until its the length of the step
if (currentStep < mySteps.length - 1) {
currentStep = currentStep + 1;
} else {
currentStep = 0;
}
});
// Log function call
print("onStepContinue : " + currentStep.toString());
},
)),
);
}
You can create Horizontal Stepper in Flutter without any external package also like by following
This will work fine and use StatefulWidget to put this code inside it (StatefulWidget).
int _currentStep = 0;
Widget build(BuildContext context) {
return Container(
child: Column(
children: [
Expanded(
child: Stepper(
type: StepperType.horizontal,
physics: ScrollPhysics(),
currentStep: _currentStep,
onStepTapped: (step) => tapped(step),
onStepContinue: continued,
onStepCancel: cancel,
steps: <Step>[
Step(
title: new Text(''),
content: Column(
children: <Widget>[
TextFormField(
decoration: InputDecoration(labelText: 'Email Address'),
),
TextFormField(
decoration: InputDecoration(labelText: 'Password'),
),
],
),
isActive: _currentStep >= 0,
state: _currentStep >= 0 ?
StepState.complete : StepState.disabled,
),
Step(
title: new Text(''),
content: Column(
children: <Widget>[
TextFormField(
decoration: InputDecoration(labelText: 'Home Address'),
),
TextFormField(
decoration: InputDecoration(labelText: 'Postcode'),
),
],
),
isActive: _currentStep >= 0,
state: _currentStep >= 1 ?
StepState.complete : StepState.disabled,
),
Step(
title: new Text(''),
content: Column(
children: <Widget>[
TextFormField(
decoration: InputDecoration(labelText: 'Mobile Number'),
),
],
),
isActive:_currentStep >= 0,
state: _currentStep >= 2 ?
StepState.complete : StepState.disabled,
),
Step(
title: new Text(''),
content: Column(
children: <Widget>[
TextFormField(
decoration: InputDecoration(labelText: 'Mobile Number'),
),
],
),
isActive:_currentStep >= 0,
state: _currentStep >= 3 ?
StepState.complete : StepState.disabled,
),
],
),
),
],
),
);
}
tapped(int step){
setState(() => _currentStep = step);
}
continued(){
_currentStep < 3 ?
setState(() => _currentStep += 1): null;
}
cancel(){
_currentStep > 0 ?
setState(() => _currentStep -= 1) : null;
}
Wrap the stepper with a ConstrainedBox and set its height to a constant and make the StepperType as horizontal. You can check it in dartpad .
return ConstrainedBox(
constraints: BoxConstraints.tightFor(height: 500.0),
child: Stepper(
type: StepperType.horizontal,
),
);
There is an issue about this on github https://github.com/flutter/flutter/issues/40601
BUT
This is what i m using right now
output image
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
theme:ThemeData(
primarySwatch:Colors.amber
),
debugShowCheckedModeBanner: false,
home: Scaffold(
body: Center(
child: MyWidget(),
),
),
);
}
}
class CustomStep {
final String title;
final Widget page;
CustomStep(
{#required this.title, #required this.page});
}
class MyWidget extends StatefulWidget {
const MyWidget({ Key key }) : super(key: key);
#override
_MyWidgetState createState() => _MyWidgetState();
}
class _MyWidgetState extends State<MyWidget> {
ScrollController _scrollController = new ScrollController();
static const double STEP_WIDTH = 90;
PageController pageController = PageController();
List<CustomStep> stepsList;
int currentPage=0;
#override
void initState() {
super.initState();
stepsList = [
CustomStep(
title: 'ddddd',
page: Placeholder(
color: Colors.pink,
),
),
CustomStep(
title: 'zzzzzzzz',
page: Placeholder(
color: Colors.deepPurple,
),
),
];
}
SizedBox buildStepDivider(int index) {
return SizedBox(
height: 90,
child: Container(
alignment: Alignment.topCenter,
child: Transform.translate(
offset: Offset(0, 16),
child: Container(
color: index < currentPage
? Theme.of(context).primaryColor
: Colors.grey,
width: 30,
height: 3,
padding: EdgeInsets.symmetric(horizontal: 10),
),
),
),
);
}
buildStep(int index) {
return Padding(
padding: const EdgeInsets.symmetric(horizontal: 5),
child: SizedBox(
height: 90,
width: STEP_WIDTH,
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Container(
decoration: BoxDecoration(
shape: BoxShape.circle,
color: index <= currentPage
? Theme.of(context).primaryColor
: Colors.grey[300],
),
padding: EdgeInsets.all(10),
child: Text((index + 1).toString()),
),
Expanded(
child: Text(
stepsList[index].title,
textAlign: TextAlign.center,
))
],
),
),
);
}
_buildStepper(int currentStep) {
Future.delayed(
Duration(milliseconds: 100),
() => _scrollController.animateTo((STEP_WIDTH * currentStep).toDouble(),
duration: const Duration(milliseconds: 300),
curve: Curves.easeOut));
return Center(
child: SizedBox(
height: 110,
child: ListView.builder(
controller: _scrollController,
shrinkWrap: true,
scrollDirection: Axis.horizontal,
itemCount: stepsList.length,
itemBuilder: (ctx, index) => index < stepsList.length - 1
? Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
buildStep(index),
buildStepDivider(index)
],
)
:Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
buildStep(index)]) ),
),
);
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('hello'), centerTitle: true),
body: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
_buildStepper(currentPage),
Expanded(
child: PageView.builder(
controller: pageController,
physics: NeverScrollableScrollPhysics(),
onPageChanged: (index) {
setState(() {
currentPage = index;
});
},
itemCount: stepsList.length,
itemBuilder: (ctx, index) =>
stepsList[index].page,
)),
],
),
);
}
}
I am sure you have got the answer, but maybe this is for someone who is looking for a package instead of creating a custom one. Here is something that I found good, please do check out and see if it fits in your use-case.
https://pub.dev/packages/im_stepper
A very easy step to create a number stepper is
Container(
margin: const EdgeInsets.only(top: 4, right: 6),
padding: const EdgeInsets.all(3.0),
decoration: BoxDecoration(
border: Border.all(color: Colors.red, width: 2),
borderRadius: BorderRadius.circular(2),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
InkWell(
child: Icon(Icons.remove, color: Colors.red),
onTap: _dicrement,
),
Container(
margin: EdgeInsets.only(right: 8, left: 8),
child: Text(
_currentCount.toString(),
style: TextStyle(fontWeight: FontWeight.bold),
),
),
InkWell(
child: Icon(Icons.add, color: Colors.red),
onTap: _increment,
),
],
),
),
I'm new to flutter and I'm using flutter video_player plugin to play videos. After I capture a video file (using camera plugin), I'd like to start video playback 1 second into the video (essentially to skip the first second). I tried using .seekTo and passed it a Duration but it returned the following error:
[VERBOSE-2:ui_dart_state.cc(148)] Unhandled Exception: NoSuchMethodError: The getter '_duration' was called on null.
Receiver: null
Tried calling: _duration
The API reference seemed straightforward enough but it's not like Duration. Here's my code and thanks in advance!
Future<void> _startVideoPlayer() async {
videoPlayerController = VideoPlayerController.file(File(videoPath));
videoPlayerController.setVolume(1.0);
videoPlayerController.setLooping(true);
videoPlayerController.seekTo(Duration(seconds: 1));
await videoPlayerController.initialize();
await videoPlayerController.play();
}
You need to initialize first then do seekTo and play
code snippet
_videoPlayerController1..initialize().then((_){
setState(() {
_videoPlayerController1.seekTo(Duration(seconds: 3));
_videoPlayerController1.play();
});
});
demo skip 3 seconds
full code
import 'package:chewie/chewie.dart';
import 'package:chewie/src/chewie_player.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:video_player/video_player.dart';
void main() {
runApp(
MyApp(),
);
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: ChewieDemo(title: 'Flutter Demo Home Page'),
);
}
}
class ChewieDemo extends StatefulWidget {
ChewieDemo({this.title = 'Chewie Demo'});
final String title;
#override
State<StatefulWidget> createState() {
return _ChewieDemoState();
}
}
class _ChewieDemoState extends State<ChewieDemo> {
TargetPlatform _platform;
VideoPlayerController _videoPlayerController1;
VideoPlayerController _videoPlayerController2;
ChewieController _chewieController;
#override
void initState() {
super.initState();
_videoPlayerController1 = VideoPlayerController.network(
'https://flutter.github.io/assets-for-api-docs/assets/videos/butterfly.mp4');
_videoPlayerController2 = VideoPlayerController.asset(
'assets/videos/sample.mp4');
_chewieController = ChewieController(
videoPlayerController: _videoPlayerController1,
aspectRatio: 3 / 2,
autoPlay: false,
looping: true,
// Try playing around with some of these other options:
// showControls: false,
// materialProgressColors: ChewieProgressColors(
// playedColor: Colors.red,
// handleColor: Colors.blue,
// backgroundColor: Colors.grey,
// bufferedColor: Colors.lightGreen,
// ),
// placeholder: Container(
// color: Colors.grey,
// ),
// autoInitialize: true,
);
}
#override
void dispose() {
_videoPlayerController1.dispose();
_videoPlayerController2.dispose();
_chewieController.dispose();
super.dispose();
}
#override
Widget build(BuildContext context) {
return MaterialApp(
title: widget.title,
theme: ThemeData.light().copyWith(
platform: _platform ?? Theme.of(context).platform,
),
home: Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Column(
children: <Widget>[
Expanded(
child: Center(
child: Chewie(
controller: _chewieController,
),
),
),
FlatButton(
onPressed: () {
_chewieController.enterFullScreen();
},
child: Text('Fullscreen'),
),
Row(
children: <Widget>[
Expanded(
child: FlatButton(
onPressed: () {
setState(() {
_chewieController.dispose();
/*_videoPlayerController2.pause();
_videoPlayerController2.seekTo(Duration(seconds: 0));*/
_chewieController = ChewieController(
videoPlayerController: _videoPlayerController1,
aspectRatio: 3 / 2,
autoPlay: false,
looping: true,
);
_videoPlayerController1..initialize().then((_){
setState(() {
_videoPlayerController1.seekTo(Duration(seconds: 3));
_videoPlayerController1.play();
});
});
});
},
child: Padding(
child: Text("Seek To"),
padding: EdgeInsets.symmetric(vertical: 16.0),
),
),
),
Expanded(
child: FlatButton(
onPressed: () {
setState(() {
_chewieController.dispose();
_videoPlayerController2.pause();
_videoPlayerController2.seekTo(Duration(seconds: 0));
_chewieController = ChewieController(
videoPlayerController: _videoPlayerController1,
aspectRatio: 3 / 2,
autoPlay: true,
looping: true,
);
});
},
child: Padding(
child: Text("Video 1"),
padding: EdgeInsets.symmetric(vertical: 16.0),
),
),
),
Expanded(
child: FlatButton(
onPressed: () {
setState(() {
_chewieController.dispose();
_videoPlayerController1.pause();
_videoPlayerController1.seekTo(Duration(seconds: 0));
_chewieController = ChewieController(
videoPlayerController: _videoPlayerController2,
aspectRatio: 3 / 2,
autoPlay: true,
looping: true,
);
});
},
child: Padding(
padding: EdgeInsets.symmetric(vertical: 16.0),
child: Text("Video 2"),
),
),
)
],
),
Row(
children: <Widget>[
Expanded(
child: FlatButton(
onPressed: () {
setState(() {
_platform = TargetPlatform.android;
});
},
child: Padding(
child: Text("Android controls"),
padding: EdgeInsets.symmetric(vertical: 16.0),
),
),
),
Expanded(
child: FlatButton(
onPressed: () {
setState(() {
_platform = TargetPlatform.iOS;
});
},
child: Padding(
padding: EdgeInsets.symmetric(vertical: 16.0),
child: Text("iOS controls"),
),
),
)
],
)
],
),
),
);
}
}
I have a main dart file and a settings dart file. The settings dart file is responsible for the appearance of the main dart file. Settings dart has a AppTheme class. Upon users typing on this settings page I want the main page to update.
My attempt at this was calling the class and redefining the variables based on user input. Doesnt work whether or not I use setState(). I also tried jus staying on the main page and tried changing the theme onPressed for the settings button. That didnt work either. Iconbutton update doesnt update the state either.
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:resume/settings.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Title',
theme: ThemeData.light(),
home: HomePage(),
);
}
}
class HomePage extends StatefulWidget {
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
#override
Widget build(BuildContext context) {
double buttonMargin = MediaQuery.of(context).size.width / 10;
double screenWidth = MediaQuery.of(context).size.width;
double screenHeight = MediaQuery.of(context).size.height;
return MaterialApp(
home: Scaffold(
backgroundColor: AppTheme().backgroundMain,
body: SafeArea(
child: Padding(
padding: const EdgeInsets.fromLTRB(0, 20, 0, 0),
child: Column(
children: <Widget>[
Container(
height: (MediaQuery.of(context).size.height / 2.25),
child: Column(children: <Widget>[
Container(
margin: EdgeInsets.all(10),
child: Text(AppTheme().name,
style: TextStyle(
fontFamily: 'Pacifico',
fontSize: screenWidth / 8.57142857143,
color: AppTheme().nameTextColor,
fontWeight: FontWeight.bold)),
),
]),
),
Container(
height: screenHeight / 2.3,
alignment: Alignment.bottomCenter,
child: ListView(
scrollDirection: Axis.horizontal,
children: <Widget>[
Container(
margin: EdgeInsets.fromLTRB(
buttonMargin * 1.5,
buttonMargin * 3,
buttonMargin * 1.5,
buttonMargin * 3),
height: MediaQuery.of(context).size.height / 2,
width: MediaQuery.of(context).size.width / 2,
child: RaisedButton(
color: AppTheme().backgroundSecondary,
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Icon(
Icons.settings,
color: Colors.white,
),
Padding(
padding: const EdgeInsets.all(8.0),
child: Text(
'Settings',
style: TextStyle(color: Colors.white),
),
)
],
),
onPressed: () {
setState(() {
Navigator.push(
context,
MaterialPageRoute(builder: (context) {
return MySettings();
}),
);
},
);
},
),
),
],
),
),
],
),
),
),
),
);
}
}
settings.dart
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
void settings() {
runApp(MySettings());
}
class AppTheme {
var backgroundMain = Colors.red;
var backgroundSecondary = Colors.teal;
var backgroundAvatar = Colors.white;
var nameTextColor = Colors.white;
var professionTextColor = Colors.red[100];
var contactTextColor = Colors.teal;
var testPrint = print("hi");
String name = 'John Doe';
String nameFont = 'Pacifico';
String professionFont = 'roboto';
}
class MySettings extends StatefulWidget {
#override
MySettingsState createState() => MySettingsState();
}
class MySettingsState extends State<MySettings> {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
backgroundColor: AppTheme().backgroundMain,
title: Text('Settings'),
leading: IconButton(
icon: Icon(Icons.arrow_back),
onPressed: () {
setState(() {
AppTheme().backgroundMain = Colors.yellow;
print(AppTheme().name);
Navigator.pop(context);
});
},
),
),
backgroundColor: Colors.teal,
body: SafeArea(
child: ListView(
children: <Widget>[
Container(
child: TextField(
onChanged: (text) {
setState(() {
AppTheme().name = text;
});
},
),
),
Container(
child: TextField(),
),
],
)),
),
);
}
}
1 Make sure to properly import
Flutter/Dart Static variables lost / keep getting reinitialized
2 You cannot alter the variables in the class. You must create an object and alter the object.
i.e I was doing
Class MyClass {
var myVariable = someValue
}
MyClass.myVariale = aDifferentValue
This did not update MyClass
What I needed to do worked once I created an object
var myClassObject = new Myclass();
myClassObject.myVariable = aDifferentValue
Now I just alter and call on myClassObject.