container where I want clicking in edit button container expand in height and show option when I click on edit button container will close
You need to set bool for expand or not in edit button.
You can follow the bellow code.
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
bool isEdit;
class Test extends StatefulWidget {
#override
_TestState createState() => _TestState();
}
class _TestState extends State<Test> {
#override
void initState() {
isEdit = false;
super.initState();
}
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Center(
child: RaisedButton(
onPressed: () {
setState(() {
isEdit = !isEdit;
});
},
child: Text("Edit"),
),
),
isEdit
? ConstrainedBox(
constraints: BoxConstraints(
maxWidth: double.infinity,
minHeight: 0.0,
maxHeight: 200.0,
),
child: Container(
height: 50,
width: 50,
color: Color(0xffff0000),
child: TextField(),
),
)
: Container()
],
),
),
),
);
}
}
Related
I have an app that shows its content in a SingleChildScrollView. There is Container with a transparent color that I'd like to change the color of to red when the SingleChildScrollView is scrolled to any other position than the start position and then change the color back to transparent when the SingleChildScrollView is scrolled back to its starting position. Code:
class App extends StatefulWidget {
const App({Key? key}) : super(key: key);
#override
State<App> createState() => _AppState();
}
class _AppState extends State<App> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Stack(
children: [
Column(
children: [
Flexible(
child: ScrollConfiguration(
behavior: RemoveScrollGlow(),
child: SingleChildScrollView(
child: Column(
children: [
Stack(...) //This is the top section of the page
],
),
),
),
),
],
),
Container(
color: Colors.transparent, //This is the Color I want to change based on the position of the SingleChildScrollView
height: 120,
child: Column(...)
),
],
),
backgroundColor: Colors.white,
);
}
}
EDIT: I managed to make it work by wrapping the SingleChildScrollView in a NotificationListener and updating the color based on the notification like this:
class _AppState extends State<App> {
Color bannercolor = Colors.transparent;
#override
Widget build(BuildContext context) {
return Scaffold(
body: Stack(
children: [
Column(
children: [
Flexible(
child: ScrollConfiguration(
behavior: RemoveScrollGlow(),
child: NotificationListener<ScrollUpdateNotification>(
onNotification: (scrollEnd) {
final metrics = scrollEnd.metrics;
if (metrics.pixels != 0) {
setState(() {
bannercolor = Colors.white;
});
} else {
setState(() {
bannercolor = Colors.transparent;
});
}
return true;
},
child: SingleChildScrollView(
child: Column(
children: [
Column(...),
],
),
),
),
),
),
],
),
Container(
color: bannercolor,
height: 120,
child: Column(...),
),
],
),
backgroundColor: Colors.white,
);
}
}
You can try listening to the scroll controller offset like this
class App extends StatefulWidget {
const App({Key? key}) : super(key: key);
#override
State<App> createState() => _AppState();
}
class _AppState extends State<App> {
final ScrollController _scrollController = ScrollController ();
#override
Widget build(BuildContext context) {
return Scaffold(
body: Stack(
children: [
Column(
children: [
Flexible(
child: ScrollConfiguration(
behavior: RemoveScrollGlow(),
child: SingleChildScrollView(
controller: _scrollController, //add controller here
child: Column(
children: [
Stack(...) //This is the top section of the page
],
),
),
),
),
],
),
AnimatedBuilder(
animation: _scrollController,
builder: (context, _content) {
return Container (
(_scrollController.offset>20)? Colors.blue: Colors.transparent,
height: 120,
child: Column(...)
);
}
),
],
),
backgroundColor: Colors.white,
);
}
}
I am begginner flutter developer, I want to take a support, I designed welcome page and I put background image to the container, but I want it to scale and re-scale forever while user on welcome page, I just want to learn teory of animation controller and how to use them. How can I implement this to my code. Thank you... Have a nice day.
import 'package:flutter/material.dart';
import 'package:animated_text_kit/animated_text_kit.dart';
import 'file:///C:/Users/yagiz/AndroidStudioProjects/naber/lib/screens/login_screen.dart';
import 'file:///C:/Users/yagiz/AndroidStudioProjects/naber/lib/screens/registration_screen.dart';
import '../widgets.dart';
import 'package:naber/constants.dart';
class WelcomeScreen extends StatefulWidget {
static String id="welcome_screen";
#override
_WelcomeScreenState createState() => _WelcomeScreenState();
}
class _WelcomeScreenState extends State<WelcomeScreen> with TickerProviderStateMixin {
bool isFinished;
AnimationController controllerForContainerHeight;
AnimationController controllerForContainerWidth;
Animation scaleAnimationForContainerWidth;
Animation scaleAnimationForContainerHeight;
#override
void initState(){
super.initState();
controllerForContainerWidth=AnimationController(duration:(Duration(seconds: 2)),vsync: this);
scaleAnimationForContainerWidth=Tween<double>(begin: 1080, end: 1380).animate(controllerForContainerWidth);
controllerForContainerWidth.forward();
controllerForContainerWidth.addListener(() {
setState(() {
});
});
controllerForContainerWidth.addStatusListener((status) {
if(status==AnimationStatus.completed){
controllerForContainerWidth.reverse();
}
if(status==AnimationStatus.dismissed){
controllerForContainerWidth.forward();
}
});
controllerForContainerHeight=AnimationController(duration:(Duration(seconds: 2)),vsync: this);
scaleAnimationForContainerHeight=Tween<double>(begin: 1920, end: 2220).animate(controllerForContainerHeight);
controllerForContainerHeight.forward();
controllerForContainerHeight.addListener(() {
setState(() {
});
});
controllerForContainerHeight.addStatusListener((status) {
setState(() {
if(status==AnimationStatus.completed){
controllerForContainerHeight.reverse();
}
if(status==AnimationStatus.dismissed){
controllerForContainerHeight.forward();
}
});
});
controllerForContainerHeight.repeat(reverse: true);
}
#override
void dispose(){
controllerForContainerWidth.dispose();
controllerForContainerHeight.dispose();
super.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: AnimatedBuilder(
animation: controllerForContainerHeight,
builder: (BuildContext context,_){
return AnimatedBuilder(
animation: controllerForContainerWidth,
builder: (BuildContext context,_){
return Container(
width: controllerForContainerWidth.value,
height: controllerForContainerHeight.value,
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage(kWelcomeScreenBackgroundImage),
fit: BoxFit.cover,
),
),
child: Padding(
padding: EdgeInsets.all(20.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.start,
textBaseline: TextBaseline.alphabetic,
crossAxisAlignment: CrossAxisAlignment.end,
children: [
Hero(
tag: "logo",
child: Container(
child: Image.asset(kLogoImage),
height: 140,
),
),
TypewriterAnimatedTextKit(
speed: Duration(milliseconds:200),
text:[kWelcomePageText],
textStyle: kWelcomePageTextStyle,
),
],
),
SizedBox(
height: 70,
),
WelcomeScreenButtons(text:kLoginText,color1:kLoginButtonColor1,
color2:kLoginButtonColor2,
color3:kLoginButtonColor3,route: LoginScreen.id),
SizedBox(height: 15),
WelcomeScreenButtons(text:kRegistrationText,color1:kRegisterButtonColor1,
color2:kRegisterButtonColor2,
color3:kRegisterButtonColor3,route: RegistrationScreen.id),
],
),
),
);
}
);
}
),
);
}
}
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(home: Scaffold(body: Center(child: TestWidget())));
}
}
class TestWidget extends StatefulWidget {
TestWidgetState createState() => new TestWidgetState();
}
class TestWidgetState extends State<TestWidget> {
List<Widget> _bodyItems = [];
List<Widget> _topItems = [];
final Widget _boundary = Column(
children: <Widget>[
SizedBox(
height: 10,
),
SizedBox(
child: Container(
color: Colors.black12,
),
height: 1,
),
SizedBox(
height: 10,
),
],
);
#override
void initState() {
super.initState();
Widget e = GestureDetector(key: Key("0"), onTap: () {
onChangedFunction(Key("0"));
},child: Text("This text is on body range"));
_bodyItems.add(e);
_topItems = [];
}
void onChangedFunction(Key key) async {
setState(() {
_bodyItems.removeAt(0);
_topItems.add(Text("This text is on top range."));
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Column(
children: <Widget>[
SizedBox(
height: 10,
),
ConstrainedBox(
constraints: BoxConstraints(
maxHeight: 100,
),
child: ListView(
scrollDirection: Axis.horizontal,
children: _topItems,
),
),
_boundary,
ConstrainedBox(
constraints: BoxConstraints(
minHeight: 450,
maxHeight: 450,
),
child: Column(
children: _bodyItems,
),
),
_boundary,
],
)));
}
}
result
top items : [Text("This text is on top range.")]
This code deletes the body item when the widget of the body item is tapped and added item at the top item.
Looking at the result, you can see that the data disappeared from the body item widget and the data was added to the top item widget.
However, the data of the top item is not render.
I want to know what the reason is.
This happens because Children is constant, you can see that if you look into definition.
You will find following line in implementation of ListView.
List<Widget> children = const <Widget>[],
but you can change widget in side children, so you have to give list as a children of list.
As Foolowing.
children: [..._topItems],
Replace _topItems and _bodyItems with below
children: [..._topItems], & children: [..._bodyItems], --inside your body
I want to navigate from "Now Showing" to "Coming Soon" with a left swipe on the image, Moreover, I want the Appbar to not to move when I swipe, but I think it is only possible with tab bars and I am not sure, please give some advice if you know how to achieve this
enter image description here
As per GaboBrandX, he is correct. But you can also do one thing with the tabs also. The sliding will not work. It is complex, but you can give it a shot.
The picture I will give you, so there would be Tabs and below that there would be a container each container gets replaces by a click.
TabController controller;
int activeIndex = 0;
#override
void initState() {
super.initState();
this.tabController = TabController(length: 3, vsync: this);
}
//This changes the activeIndex based upon the tabController index
onTabChanged(){
this.setState((){
this.activeTabIndex = this.tabController.index;
});
}
//This will return your container, based upon your tabs selected
Widget getActiveTabView(){
case 1: {return YourSecondContainer();}
break;
default: {return YourFirstContainer();}
}
//Here is your full layout
#override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
TMTabBar(titles: 'XYZ', controller: this.tabController, onChange: this.onTabChanged),
this.getActiveTabView(),
]
);
}
//Create a TabBarWidget and do this
class TMTabBar extends StatefulWidget {
String/List<String> titles;
TabController controller;
VoidCallback onChange;
TMTabBar({#required this.titles, #required this.controller, this.onChange});
#override
_TMTabBarState createState() => _TMTabBarState();
}
class _TMTabBarState extends State<TMTabBar> {
#override
void initState() {
//this is for changing the content as per the tabbar
this.widget.controller.addListener((){
if(this.widget.controller.indexIsChanging){
if(this.widget.onChange != null) this.widget.onChange();
}
});
super.initState();
}
#override
Widget build(BuildContext context) {
return TabBar(tab: YourTabs);
}
This basically gives you, what you're hoping for. Hope that helps. Thanks :)
Here I've made an example of what your looking for using a PageView. I've put only text on PageView's children, but you can put there your ListViews or anything you need. When tapping on a button the PageView navigates to the corresponding "page". This can be a starting point for you:
import 'package:flutter/material.dart';
class HomePage extends StatefulWidget {
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
PageController _pageController = PageController(
initialPage: 0,
);
goToPage(num page) {
_pageController.animateToPage(
page,
duration: Duration(milliseconds: 350),
curve: Curves.easeIn,
);
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Stack(
children: <Widget>[
Align(
alignment: Alignment.topCenter,
child: Container(
width: double.infinity,
height: 60.0,
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
child: Row(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Expanded(
child: RaisedButton(
onPressed: () => goToPage(0),
child: Text('Now Showing'),
),
),
SizedBox(
width: 4.0,
),
Expanded(
child: RaisedButton(
onPressed: () => goToPage(1),
child: Text('Coming Soon'),
),
),
],
),
),
),
),
Align(
alignment: Alignment.bottomCenter,
child: Container(
width: double.infinity,
height: MediaQuery.of(context).size.height - 60.0,
child: PageView(
controller: _pageController,
children: <Widget>[
Center(
child: Text('Tab 1'),
),
Center(
child: Text('Tab 2'),
),
],
),
),
),
],
),
),
);
}
}
I am trying to make a simple image that appears or disappears when a button is pushed. This button resides in a separate class to the image, so in Flutter this creates a massive headache of an issue.
I have read many forums on this and I have tried all the solutions posed but none of them are working for me.
What I am trying to do:
class SinglePlayerMode extends StatefulWidget {
#override
SinglePlayerModeParentState createState() => SinglePlayerModeParentState();
}
class SinglePlayerModeParentState extends State<SinglePlayerMode> {\
bool coinVisible = false;
toggleCoin() {
setState(() {
coinVisible = !coinVisible;
});
}
Widget topMenuRow() {
return Stack(
children: [
Column(
children: [
coinVisible == true ?
Padding(
padding: EdgeInsets.all(50),
child: Container(
height: 60,
width: 60,
color: Colors.blueGrey[0],
decoration: BoxDecoration(
color: Colors.blueAccent,
image: DecorationImage(
image: ExactAssetImage('lib/images/coin_head.jpg'),
fit: BoxFit.cover,
),
),
),
) : Container(
height: 60,
width: 60,
color: Colors.black,
),
],
),
],
);
}
#override
Widget build(BuildContext context) {
return Scaffold(
child: ListView(
padding: EdgeInsets.symmetric(horizontal: 10.0, vertical: 10.0),
children: [
topMenuRow(),
SizedBox(height: 40),
],
),
),
);
}
And this is the separate class which I would like to trigger the SetState() on coinVisible from:
class dropDownMenu extends StatefulWidget { #override
_dropDownMenuState createState() => _dropDownMenuState();
}
class _dropDownMenuState extends State<dropDownMenu> {
#override
Widget build(BuildContext context) {
return Stack(
children: <Widget> [
Column(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
Container(
child: Opacity(
opacity: 0.0,
child: FloatingActionButton(
heroTag: null,
onPressed: (){
//SOMEHOW CALL SetState() ON coinVisble HERE!
},
),
),
);
}
}
But nothing I have tried is working, and I have lost hours.
It simple, you need to send your SinglePlayMode::toggleCoin function as callback to dropDownMenu class.
class dropDownMenu extends StatefulWidget {
final _callback; // callback reference holder
//you will pass the callback here in constructor
dropDownMenu( {#required void toggleCoinCallback() } ) :
_callback = toggleCoinCallback;
#override
_dropDownMenuState createState() => _dropDownMenuState();
}
class _dropDownMenuState extends State<dropDownMenu> {
#override
Widget build(BuildContext context) {
return Stack(
children: <Widget> [
Column(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
Container(
child: Opacity(
opacity: 0.0,
child: FloatingActionButton(
heroTag: null,
onPressed: (){
widget?._callback(); // callback calling
},
),
),
);
}
}
Then when you create a dropDownMenu class instance in your SinglePlayerMode class you will do
dropDownMenu(
toggleCoinCallback: toogleCoin,
);