How to remove build side effects in this context, using Staggered Grid View Builder Flutter? - flutter

Question

I am trying to create the build method without side effects (without blinking). I solved this problem using StatefulBuilder, but I read that I should rebuild 1000x times without any change or effect.
The Staggered Grid View Builder Widget are rebuilt when the keyboard is opening, or whenever I open again the page, or add/remove an item from it. That's good, normally, but with side effects like you see below. Maybe there is any solution to animate the remove/add functionality, or the infinite reloading and keep the rest of the items in cache. So I need to limit the builder recreate inside Grid View Builder?
On other applications I don't see this ugly "blinking". Where is the problem and how can I solve it? I used Animation Limiter but it's not working for me, neither PrecacheImage, somehow I need to rebuild without blink (first items).
My code:
class VisionBoard extends StatefulWidget {
const VisionBoard({Key? key}) : super(key: key);
#override
_VisionBoardState createState() => _VisionBoardState();
}
class _VisionBoardState extends State<VisionBoard> with SingleTickerProviderStateMixin {
ScreenshotController screenshotController = ScreenshotController();
String saveGoalsButtonText = "SAVE GOALS";
String wallpaperButtonText = "CREATE WALLPAPER";
String saveWallpaperButtonText = "SAVE";
bool createWallpaper = false;
bool isWallpaperCreated = false;
late File imageFile;
late String newImage;
late Uint8List imageRaw;
int noOfImages = 0;
late Uint8List wallpaperBytes;
String title = "My Vision Board";
String goals = "";
late List<String> visions = <String>[];
final TextEditingController _textFieldController = TextEditingController();
final TextEditingController _goalsController = TextEditingController();
static final _formKey = GlobalKey<FormState>();
#override
void initState() {
super.initState();
loadVisionBoardTitleAndImages();
}
void loadVisionBoardTitleAndImages() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
//await prefs.clear();
setState(() {
_textFieldController.text = prefs.getString('titlu') ?? title;
visions = prefs.getStringList('visions') ?? <String>[];
_goalsController.text = prefs.getString('goals') ?? goals;
});
}
void _removeVisions(int index) async {
SharedPreferences prefs = await SharedPreferences.getInstance();
setState(() {
isButtonDisabled=true;
visions.removeAt(index);
prefs.setStringList('visions', visions);
createWallpaper = false;
wallpaperButtonText = "CREATE WALLPAPER";
isWallpaperCreated = false;
});
await CreateWallpaperLayouts().createWallpaper(visions).then((value) {
setState(() {
wallpaperBytes = value;
wallpaper = Image.memory(wallpaperBytes);
precacheImage(wallpaper.image, context);
isButtonDisabled=false;
});
});
}
#override
Widget build(BuildContext context) {
return Sizer(
builder: (context, orientation, deviceType) {
return GestureDetector(
onTap: () {
FocusScopeNode currentFocus = FocusScope.of(context);
if (!currentFocus.hasPrimaryFocus) {
currentFocus.unfocus();
}
},
child: Scaffold(
body: AnimationLimiter(
child: Container(
decoration: const BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/background-marmura.jpeg"), fit: BoxFit.cover)),
child: SafeArea(
child: SingleChildScrollView(
child: Container(
margin: const EdgeInsets.fromLTRB(20, 0, 20, 0),
child: Column(
children: [
StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return Row(
children: [
Flexible(
child: Text(_textFieldController.text,
style: const TextStyle(
fontWeight: FontWeight.w700,
fontSize: 21,
color: Color(0xff393432),
),
),
),
IconButton(
icon: const Icon(
Icons.edit,
size: 21,
color: Color(0xff393432),
),
onPressed: () {
showAlertDialog(context, setState);
},
)
]);
}
),
const SizedBox(height: 5),
GridView.builder(
clipBehavior: Clip.none,
physics: const ScrollPhysics(),
shrinkWrap: true,
gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(
maxCrossAxisExtent: SizeConfig.screenWidth!/3,),
itemCount: (visions.length == 12) ? visions.length : visions.length + 1,
itemBuilder: (BuildContext ctx, index) {
if (index < visions.length) {
return AnimationConfiguration.staggeredGrid(
position: index,
duration: const Duration(milliseconds: 1000),
columnCount: 3,
child: ScaleAnimation(
child: FadeInAnimation(
child: OpacityAnimatedWidget.tween(
opacityEnabled: 1, //define start value
opacityDisabled: 0, //and end value
enabled: index < visions.length, //bind with the boolean
child: Stack(
alignment: Alignment.center,
children: [
Container(
width: 25.w,
height: 25.w,
decoration: BoxDecoration(
image: DecorationImage(
image: CleverCloset.imageFromBase64String(visions[index]).image,
fit: BoxFit.fill),
borderRadius: const BorderRadius.all(
Radius.circular(
5.0) // <--- border radius here
),
),
),
Positioned(
top:0,
right:0,
child: ClipOval(
child: InkWell(
onTap: () {
_removeVisions(index);
},
child: Container(
padding: const EdgeInsets.all(5),
color: Colors.white,
child:
const Icon(
Icons.delete,
size: 16,
color: Color(0xff393432)),
),
),
),
),
],
clipBehavior: Clip.none,
),
),
),
),
);
}
else if(index<12){
return InkWell(
onTap: () {
_openGallery(context);
},
child:
Stack(
alignment: Alignment.center,
children:[
Container(
width: 25.w,
height: 25.w,
decoration:
BoxDecoration(
border: Border.all(color: const Color(0xff393432)),
borderRadius: const BorderRadius.all(Radius.circular(5.0)),
),
child:
const Icon(
Icons.add,
size: 25,
color: Color(0xff393432),
)
),
],
),
);
}
else {
return Container(color: Colors.red);
}
}
),
const SizedBox(height: 10),
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: const [
Text("You can add up to 12 pictures.",
style: TextStyle(
fontSize: 15,
fontWeight: FontWeight.w400,
fontStyle: FontStyle.italic,
),),
],
),
const SizedBox(height: 10),
StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return Column (
children: [
if(visions.isNotEmpty && visions.length>1 && !isWallpaperCreated) Row(
children: [
SizedBox(
width: 50.w,
child: OpacityAnimatedWidget.tween(
opacityEnabled: 1, //define start value
opacityDisabled: 0, //and end value)
enabled: !isWallpaperCreated &&
visions.isNotEmpty && visions.length > 1,
child: OutlinedButton(
onPressed: visions.isNotEmpty &&
visions.length > 1 ? () async{
setState(() {
wallpaperButtonText = "CREATING...";
//_createWallpaper();
});
wallpaperBytes = await CreateWallpaperLayouts().createWallpaper(visions);
setState(() {
noOfImages = visions.length;
isWallpaperCreated = true;
createWallpaper = true;
});
//Navigator.pushReplacementNamed(context, '/masterclasses');
} : null,
style: OutlinedButton.styleFrom(
primary: const Color(0xffE4BCB4),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(
18.0),
),
side: const BorderSide(
width: 3, color: Color(0xffE4BCB4)),
),
child: Text(
wallpaperButtonText,
style: const TextStyle(
color: Color(0xff393432),
fontSize: 14,
fontWeight: FontWeight.w700,
)
),
),
),
),
],
),
const SizedBox(height:40),
if(createWallpaper==true) OpacityAnimatedWidget.tween(
opacityEnabled: 1, //define start value
opacityDisabled: 0, //and end value
enabled: createWallpaper, //bind with the boolean
child: Row(
children: const [
Flexible(
child: Text("Wallpaper",
style: TextStyle(
fontWeight: FontWeight.w700,
fontSize: 21,
color: Color(0xff393432),
),
),
),
],
),
),
if(createWallpaper==true) const SizedBox(height:15),
if(createWallpaper==true)
OpacityAnimatedWidget.tween(
opacityEnabled: 1, //define start value
opacityDisabled: 0, //and end value
enabled: createWallpaper,
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children:[ Container(
width: 50.w,//double.infinity,
height: 50.h,//SizeConfig.screenHeight,
decoration: BoxDecoration(
image: DecorationImage(
image: Image.memory(wallpaperBytes).image,
fit: BoxFit.fill,
)
),
//child: CreateWallpaperLayouts().createWallpaper(visions),
),],
),
),
if(createWallpaper==true) const SizedBox(height:10),
if(createWallpaper==true) StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return OpacityAnimatedWidget.tween(
opacityEnabled: 1, //define start value
opacityDisabled: 0, //and end value
enabled: createWallpaper,
child: Row(
children: [
SizedBox(
width: 50.w,
child: OutlinedButton(
onPressed: () {
_saveWallpaper(wallpaperBytes);
setState(() {
saveWallpaperButtonText = "SAVED!";
});
Future.delayed(const Duration(milliseconds: 1300), () {
setState(() {
saveWallpaperButtonText = "SAVE";
});
});
//Navigator.pushReplacementNamed(context, '/masterclasses');
},
style: OutlinedButton.styleFrom(
primary: const Color(0xffE4BCB4),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(18.0),
),
side: const BorderSide(width: 3, color: Color(0xffE4BCB4)),
),
child: Text(
saveWallpaperButtonText,
style: const TextStyle(
color: Color(0xff393432),
fontSize: 14,
fontWeight: FontWeight.w700,
)
),
),
),
const SizedBox(width: 10),
],
),
);
}
),
if(createWallpaper==true) const SizedBox(height:50),
Row(
children: const [
Flexible(
child: Text("Goals & Affirmations",
style: TextStyle(
fontWeight: FontWeight.w700,
fontSize: 21,
color: Color(0xff393432),
),
),
),
],
),
],
);
}
),
const SizedBox(height: 10),
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: const [
Text("Add goals and affirmations.",
style: TextStyle(
fontSize: 15,
),),
],
),
const SizedBox(height: 10),
StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return Column(
children: [
Card(
elevation: 0,
color: const Color(0xffEFEFEF),
child: Padding(
padding: const EdgeInsets.all(10.0),
child: TextFormField(
key: _formKey,
controller: _goalsController,
maxLines: 8,
decoration: const InputDecoration(border: InputBorder.none),
),
)
),
const SizedBox(height: 10),
Row(
children: [
Container(
width: 50.w,
margin: const EdgeInsets.fromLTRB(0, 0, 0, 40),
child: OutlinedButton(
onPressed: () async{
setState(() {
saveGoalsButtonText = "SAVED!";
});
Future.delayed(const Duration(seconds: 1), () {
setState(() {
saveGoalsButtonText = "SAVE GOALS";
});
});
SharedPreferences prefs = await SharedPreferences.getInstance();
setState(() {
goals = _goalsController.text;
prefs.setString('goals', goals);
});
//Navigator.pushReplacementNamed(context, '/masterclasses');
},
style: OutlinedButton.styleFrom(
primary: const Color(0xffE4BCB4),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(18.0),
),
side: const BorderSide(width: 3, color: Color(0xffE4BCB4)),
),
child: Text(
saveGoalsButtonText,
style: const TextStyle(
color: Color(0xff393432),
fontSize: 14,
fontWeight: FontWeight.w700,
)
),
),
),
],
),
],
);
}
),
],
),
),
),
),
),
),
),
);
}
);
}
}