I have a list of Widgets that I want to display in non-scrollable horizontal layout.
In the example below, I have 5 Widgets, 2 of them are fully displayed and the other 3 do not fit, hence the '+3' label.
I do not mind if there is some empty space after the label, but the important thing is that we only display Widgets that fully fit in the row.
I guess the main problem is how can I test that a Widget fits based on it's width into a row?
I thought about VisibilityDetector, but I will ended up rendering all widgets, then removing the ones that are not 100% visible, and the entire logic seems quite flawed for this use case.
Any ideas?
Thanks
try my version:
class Home extends StatefulWidget {
#override
State<Home> createState() => _HomeState();
}
class _HomeState extends State<Home> {
#override
void initState() {
super.initState();
}
#override
Widget build(BuildContext context) {
// widget
List<GlobalKey> keys = [];
var widgets = List.generate(25, (index) {
GlobalKey globalKey = GlobalKey();
keys.add(globalKey);
return FilterChip(
key: globalKey,
label: Text("asdasasd"),
);
});
return Scaffold(
appBar: AppBar(
title: Text('AppBar'),
),
body: Column(
children: [
OverRow(
keys: keys,
widgets: widgets,
),
],
),
);
}
}
class OverRow extends StatefulWidget {
OverRow({Key key, this.keys, this.widgets}) : super(key: key);
List<GlobalKey> keys = [];
List<Widget> widgets = [];
#override
State<OverRow> createState() => _OverRowState();
}
class _OverRowState extends State<OverRow> {
int overIndex = -1;
#override
void initState() {
// TODO: implement initState
WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
for (var i = 0; i < widget.keys.length; i++) {
final box = widget.keys[i].currentContext.findRenderObject() as RenderBox;
final pos = box.localToGlobal(Offset.zero);
var over = pos.dx + box.size.width > MediaQuery.of(context).size.width;
if (over) {
overIndex = i;
setState(() {});
return;
}
}
});
super.initState();
}
#override
Widget build(BuildContext context) {
return Row(
children: overIndex == -1
? widget.widgets
: [
...widget.widgets.take(overIndex).toList(),
Container(
child: Text("+${widget.widgets.skip(overIndex).length}"),
)
]);
}
}
EDIT: Included dynamic width based in label length
Try this, with defined width of item container and the +label or with dynamic calculating the width based on font size.
Change useFixedWidth to true or false if you want dynamic or static width.
Example in a Stateless widget:
class MyWidget extends StatelessWidget {
final double itemWidth = 100; //maxwidth if item container
final double labelWidth = 40; //maxWidth of +label
List<String> items = List.generate(
10, (index) => 'Name ${index + 1}'); //replace with a real list of items
final bool useFixedWidth =
false; // define if want to calculate dynamic with of each item
final double letterWidth =
12; // defined width of a letter || change depending on font size
#override
Widget build(BuildContext context) {
return LayoutBuilder(builder: (context, constraints) {
int totalItems = items.length;
int maxDisplayItems = 0;
List<double> dynamicItemsWidth = []; //if want to use dynamic width
if (useFixedWidth) {
//if want to use fixed width
maxDisplayItems =
(((constraints.maxWidth - labelWidth) / itemWidth).floor()).clamp(
0, totalItems); //check how many items fit including the +label
} else {
//if want to calculate based on string length
dynamicItemsWidth = items
.map((e) => e.length * letterWidth)
.toList(); //calculate individual item width
double _acumWidth = 0.0;
for (var width in dynamicItemsWidth) {
_acumWidth = _acumWidth + width;
if (_acumWidth < (constraints.maxWidth - labelWidth)) {
maxDisplayItems++;
}
}
}
bool showPlusSign =
maxDisplayItems < totalItems; //check if all items can be shown
return Row(children: [
Row(
children: List.generate(maxDisplayItems, (index) {
return SizedBox(
height: itemWidth,
width: useFixedWidth ? itemWidth : dynamicItemsWidth[index],
child: Container(
//color: Colors.red,
//width: itemWidth,
child: Center(child: Text('Name ${index + 1}'))));
}).toList()),
if (showPlusSign)
SizedBox(
width: labelWidth,
height: itemWidth,
child: Center(child: Text('+${totalItems - maxDisplayItems}')))
]);
});
}
}
shows this dynamic layout for 10 items:
With the code below
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
const MyApp({Key key}) : super(key: key);
#override
Widget build(BuildContext context) => MaterialApp(
home: const MyHomePage(),
);
}
class MyHomePage extends StatelessWidget {
const MyHomePage({Key key}) : super(key: key);
#override
Widget build(BuildContext context) => DefaultTabController(
length: 2,
child: Scaffold(
appBar: AppBar(
title: const Center(
child: Text('use the mouse wheel to scroll')),
bottom: TabBar(
tabs: const [
Center(child: Text('ScrollView')),
Center(child: Text('PageView'))
],
),
),
body: TabBarView(
children: [
SingleChildScrollView(
child: Column(
children: [
for (int i = 0; i < 10; i++)
Container(
height: MediaQuery.of(context).size.height,
child: const Center(
child: FlutterLogo(size: 80),
),
),
],
),
),
PageView(
scrollDirection: Axis.vertical,
children: [
for (int i = 0; i < 10; ++i)
const Center(
child: FlutterLogo(size: 80),
),
],
),
],
),
),
);
}
You can see, running it on dartpad or from this video,
that using the mouse wheel to scroll a PageView provides a mediocre experience (at best),
This is a known issue #35687 #32120, but I'm trying to find a workaround
to achieve either smooth scrolling for the PageView or at least prevent the "stutter".
Can someone help me out or point me in the right direction?
I'm not sure the issue is with PageScrollPhysics;
I have a gut feeling that the problem might be with WheelEvent
since swiping with multitouch scroll works perfectly
The problem arises from chain of events:
user rotate mouse wheel by one notch,
Scrollable receives PointerSignal and calls jumpTo method,
_PagePosition's jumpTo method (derived from ScrollPositionWithSingleContext) updates scroll position and calls goBallistic method,
requested from PageScrollPhysics simulation reverts position back to initial value, since produced by one notch offset is too small to turn the page,
another notch and process repeated from step (1).
One way to fix issue is perform a delay before calling goBallistic method. This can be done in _PagePosition class, however class is private and we have to patch the Flutter SDK:
// <FlutterSDK>/packages/flutter/lib/src/widgets/page_view.dart
// ...
class _PagePosition extends ScrollPositionWithSingleContext implements PageMetrics {
//...
// add this code to fix issue (mostly borrowed from ScrollPositionWithSingleContext):
Timer timer;
#override
void jumpTo(double value) {
goIdle();
if (pixels != value) {
final double oldPixels = pixels;
forcePixels(value);
didStartScroll();
didUpdateScrollPositionBy(pixels - oldPixels);
didEndScroll();
}
if (timer != null) timer.cancel();
timer = Timer(Duration(milliseconds: 200), () {
goBallistic(0.0);
timer = null;
});
}
// ...
}
Another way is to replace jumpTo with animateTo. This can be done without patching Flutter SDK, but looks more complicated because we need to disable default PointerSignalEvent listener:
import 'dart:async';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
class PageViewLab extends StatefulWidget {
#override
_PageViewLabState createState() => _PageViewLabState();
}
class _PageViewLabState extends State<PageViewLab> {
final sink = StreamController<double>();
final pager = PageController();
#override
void initState() {
super.initState();
throttle(sink.stream).listen((offset) {
pager.animateTo(
offset,
duration: Duration(milliseconds: 200),
curve: Curves.ease,
);
});
}
#override
void dispose() {
sink.close();
pager.dispose();
super.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Mouse Wheel with PageView'),
),
body: Container(
constraints: BoxConstraints.expand(),
child: Listener(
onPointerSignal: _handlePointerSignal,
child: _IgnorePointerSignal(
child: PageView.builder(
controller: pager,
scrollDirection: Axis.vertical,
itemCount: Colors.primaries.length,
itemBuilder: (context, index) {
return Padding(
padding: const EdgeInsets.all(8.0),
child: Container(color: Colors.primaries[index]),
);
},
),
),
),
),
);
}
Stream<double> throttle(Stream<double> src) async* {
double offset = pager.position.pixels;
DateTime dt = DateTime.now();
await for (var delta in src) {
if (DateTime.now().difference(dt) > Duration(milliseconds: 200)) {
offset = pager.position.pixels;
}
dt = DateTime.now();
offset += delta;
yield offset;
}
}
void _handlePointerSignal(PointerSignalEvent e) {
if (e is PointerScrollEvent && e.scrollDelta.dy != 0) {
sink.add(e.scrollDelta.dy);
}
}
}
// workaround https://github.com/flutter/flutter/issues/35723
class _IgnorePointerSignal extends SingleChildRenderObjectWidget {
_IgnorePointerSignal({Key key, Widget child}) : super(key: key, child: child);
#override
RenderObject createRenderObject(_) => _IgnorePointerSignalRenderObject();
}
class _IgnorePointerSignalRenderObject extends RenderProxyBox {
#override
bool hitTest(BoxHitTestResult result, {Offset position}) {
final res = super.hitTest(result, position: position);
result.path.forEach((item) {
final target = item.target;
if (target is RenderPointerListener) {
target.onPointerSignal = null;
}
});
return res;
}
}
Here is demo on CodePen.
Quite similar but easier to setup:
add smooth_scroll_web ^0.0.4 to your pubspec.yaml
...
dependencies:
...
smooth_scroll_web: ^0.0.4
...
Usage:
import 'package:smooth_scroll_web/smooth_scroll_web.dart';
import 'package:flutter/material.dart';
import 'dart:math'; // only for demo
class Page extends StatefulWidget {
#override
PageState createState() => PageState();
}
class PageState extends State<Page> {
final ScrollController _controller = new ScrollController();
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("SmoothScroll Example"),
),
body: SmoothScrollWeb(
controller: controller,
child: Container(
height: 1000,
child: ListView(
physics: NeverScrollableScrollPhysics(),
controller: _controller,
children: [
// Your content goes here, thoses children are only for demo
for (int i = 0; i < 100; i++)
Container(
height: 60,
color: Color.fromARGB(1,
Random.secure().nextInt(255),
Random.secure().nextInt(255),
Random.secure().nextInt(255)),
),
],
),
),
),
);
}
}
Thanks you hobbister !
Refer to flutter's issue #32120 on Github.
I know that it has been almost 1.5 year from this question, but I found a way that works smoothly. Maybe this will be very helpful whoever read it. Add a listener to your pageview controller with this code (You can make adjustments on duration or nextPage/animateToPage/jumpToPage etc.):
pageController.addListener(() {
if (pageController.position.userScrollDirection == ScrollDirection.reverse) {
pageController.nextPage(duration: const Duration(milliseconds: 60), curve: Curves.easeIn);
} else if (pageController.position.userScrollDirection == ScrollDirection.forward) {
pageController.previousPage(duration: const Duration(milliseconds: 60), curve: Curves.easeIn);
}
});
The issue is with the user settings, how the end-user has set the scrolling to happen with his mouse. I have a Logitech mouse that allows me to turn on or off the smooth scrolling capability via Logitech Options. When I enable smooth scrolling it works perfectly and scrolls as required but in case of disabling the smooth scroll it gets disabled on the project as well. The behavior is as set by the end-user.
Still, if there's a requirement to force the scroll to smooth scroll than can only be done by setting relevant animations. There's no direct way as of now.
I would like to put the following widgets into a SingleChildScrollView, but I want the blue box to lie right below the fold when the page renders. The user can choose to scroll it into view as needed, but to start with, it is out of the view.
I see a simple way of achieving this if I could calculate the space my red and green boxes are occupying in the screen and setting the top margin of the red box to the remaining space. A complication is that the height of the red and green boxes is dynamic based on their content, as well as the width of the boxes in portrait vs landscape layouts.
Perhaps I should use a SizedBox instead of adjusting the margin of my red box, which won't be a problem. But I still need to be able to calculate the height of the blank space at the top of my layout.
#pskink had the right idea. Here is what I did with it in code to achieve the layout.
enum AuthWidgets { form, action, disclaimer }
class AuthLayoutDelegate extends MultiChildLayoutDelegate {
AuthLayoutDelegate({#required screenHeight}) : _screenHeight = screenHeight;
double _overlap = 50;
double _screenHeight;
#override
void performLayout(Size size) {
Size formSize;
Size actionSize;
Size disclaimerSize;
// if (formSize == null && hasChild(AuthWidgets.form)) {
formSize = layoutChild(AuthWidgets.form, BoxConstraints.loose(size));
// }
// if (actionSize == null && hasChild(AuthWidgets.action)) {
actionSize = layoutChild(AuthWidgets.action, BoxConstraints.loose(size));
// }
// if (disclaimerSize == null && hasChild(AuthWidgets.disclaimer)) {
disclaimerSize =
layoutChild(AuthWidgets.disclaimer, BoxConstraints.loose(size));
// }
if (formSize != null && actionSize != null && disclaimerSize != null) {
print('laying out children');
// Need the height of the form and action area, minus the overlap
var aboveTheFold = formSize.height + actionSize.height - _overlap;
var offsetY = _screenHeight - aboveTheFold;
offsetY += formSize.height - _overlap;
positionChild(AuthWidgets.action, Offset(0, offsetY));
offsetY += actionSize.height;
positionChild(AuthWidgets.disclaimer, Offset(0, offsetY));
positionChild(AuthWidgets.form, Offset(0, _screenHeight - aboveTheFold));
}
}
#override
bool shouldRelayout(MultiChildLayoutDelegate oldDelegate) {
return false;
}
}
class AuthLayout extends StatelessWidget {
const AuthLayout({#required this.screenHeight, Key key}) : super(key: key);
final double screenHeight;
#override
Widget build(BuildContext context) {
return CustomMultiChildLayout(
delegate: AuthLayoutDelegate(screenHeight: screenHeight),
children: [
LayoutId(id: AuthWidgets.action, child: ActionMenu()),
LayoutId(id: AuthWidgets.disclaimer, child: Disclaimer()),
LayoutId(id: AuthWidgets.form, child: SignInForm()),
],
);
}
}
class SignInForm extends StatelessWidget {
const SignInForm({Key key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Container(
margin: EdgeInsets.symmetric(horizontal: 16),
child: Container(
color: Colors.red.withOpacity(0.5),
height: 350,
child: Center(
child: Text('SignInForm'),
),
),
);
}
}
class Disclaimer extends StatelessWidget {
const Disclaimer({Key key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Container(
height: 300,
color: Colors.blue.withOpacity(0.5),
child: Center(child: Text('Disclaimer')),
);
}
}
class ActionMenu extends StatelessWidget {
const ActionMenu({Key key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Container(
height: 200,
color: Colors.green.withOpacity(0.5),
child: Center(child: Text('ActionMenu')),
);
}
}
By using the delegate and the performLayout function, I was able to position my widgets precisely where I needed them. I did want my red area to appear "over" the top of the green area, so I had to ensure it was added to the CustomMultiChildLayout last (or at least after the green box).
Now I have been struggling with getting this to scroll on the page, but that is a question for a different thread.
I don't understand how LayoutBuilder is used to get the height of a Widget.
I need to display the list of Widgets and get their height so I can compute some special scroll effects. I am developing a package and other developers provide widget (I don't control them). I read that LayoutBuilder can be used to get height.
In very simple case, I tried to wrap Widget in LayoutBuilder.builder and put it in the Stack, but I always get minHeight 0.0, and maxHeight INFINITY. Am I misusing the LayoutBuilder?
EDIT: It seems that LayoutBuilder is a no go. I found the CustomSingleChildLayout which is almost a solution.
I extended that delegate, and I was able to get the height of widget in getPositionForChild(Size size, Size childSize) method. BUT, the first method that is called is Size getSize(BoxConstraints constraints) and as constraints, I get 0 to INFINITY because I'm laying these CustomSingleChildLayouts in a ListView.
My problem is that SingleChildLayoutDelegate getSize operates like it needs to return the height of a view. I don't know the height of a child at that moment. I can only return constraints.smallest (which is 0, the height is 0), or constraints.biggest which is infinity and crashes the app.
In the docs it even says:
...but the size of the parent cannot depend on the size of the child.
And that's a weird limitation.
To get the size/position of a widget on screen, you can use GlobalKey to get its BuildContext to then find the RenderBox of that specific widget, which will contain its global position and rendered size.
Just one thing to be careful of: That context may not exist if the widget is not rendered. Which can cause a problem with ListView as widgets are rendered only if they are potentially visible.
Another problem is that you can't get a widget's RenderBox during build call as the widget hasn't been rendered yet.
But what if I need to get the size during the build! What can I do?
There's one cool widget that can help: Overlay and its OverlayEntry.
They are used to display widgets on top of everything else (similar to stack).
But the coolest thing is that they are on a different build flow; they are built after regular widgets.
That have one super cool implication: OverlayEntry can have a size that depends on widgets of the actual widget tree.
Okay. But don't OverlayEntry requires to be rebuilt manually?
Yes, they do. But there's another thing to be aware of: ScrollController, passed to a Scrollable, is a listenable similar to AnimationController.
Which means you could combine an AnimatedBuilder with a ScrollController, it would have the lovely effect to rebuild your widget automatically on a scroll. Perfect for this situation, right?
Combining everything into an example:
In the following example, you'll see an overlay that follows a widget inside ListView and shares the same height.
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';
class MyHomePage extends StatefulWidget {
const MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final controller = ScrollController();
OverlayEntry sticky;
GlobalKey stickyKey = GlobalKey();
#override
void initState() {
if (sticky != null) {
sticky.remove();
}
sticky = OverlayEntry(
builder: (context) => stickyBuilder(context),
);
SchedulerBinding.instance.addPostFrameCallback((_) {
Overlay.of(context).insert(sticky);
});
super.initState();
}
#override
void dispose() {
sticky.remove();
super.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: ListView.builder(
controller: controller,
itemBuilder: (context, index) {
if (index == 6) {
return Container(
key: stickyKey,
height: 100.0,
color: Colors.green,
child: const Text("I'm fat"),
);
}
return ListTile(
title: Text(
'Hello $index',
style: const TextStyle(color: Colors.white),
),
);
},
),
);
}
Widget stickyBuilder(BuildContext context) {
return AnimatedBuilder(
animation: controller,
builder: (_,Widget child) {
final keyContext = stickyKey.currentContext;
if (keyContext != null) {
// widget is visible
final box = keyContext.findRenderObject() as RenderBox;
final pos = box.localToGlobal(Offset.zero);
return Positioned(
top: pos.dy + box.size.height,
left: 50.0,
right: 50.0,
height: box.size.height,
child: Material(
child: Container(
alignment: Alignment.center,
color: Colors.purple,
child: const Text("^ Nah I think you're okay"),
),
),
);
}
return Container();
},
);
}
}
Note:
When navigating to a different screen, call following otherwise sticky would stay visible.
sticky.remove();
This is (I think) the most straightforward way to do this.
Copy-paste the following into your project.
UPDATE: using RenderProxyBox results in a slightly more correct implementation, because it's called on every rebuild of the child and its descendants, which is not always the case for the top-level build() method.
NOTE: This is not exactly an efficient way to do this, as pointed by Hixie here. But it is the easiest.
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
typedef void OnWidgetSizeChange(Size size);
class MeasureSizeRenderObject extends RenderProxyBox {
Size? oldSize;
OnWidgetSizeChange onChange;
MeasureSizeRenderObject(this.onChange);
#override
void performLayout() {
super.performLayout();
Size newSize = child!.size;
if (oldSize == newSize) return;
oldSize = newSize;
WidgetsBinding.instance!.addPostFrameCallback((_) {
onChange(newSize);
});
}
}
class MeasureSize extends SingleChildRenderObjectWidget {
final OnWidgetSizeChange onChange;
const MeasureSize({
Key? key,
required this.onChange,
required Widget child,
}) : super(key: key, child: child);
#override
RenderObject createRenderObject(BuildContext context) {
return MeasureSizeRenderObject(onChange);
}
#override
void updateRenderObject(
BuildContext context, covariant MeasureSizeRenderObject renderObject) {
renderObject.onChange = onChange;
}
}
Then, simply wrap the widget whose size you would like to measure with MeasureSize.
var myChildSize = Size.zero;
Widget build(BuildContext context) {
return ...(
child: MeasureSize(
onChange: (size) {
setState(() {
myChildSize = size;
});
},
child: ...
),
);
}
So yes, the size of the parent cannot can depend on the size of the child if you try hard enough.
Personal anecdote - This is handy for restricting the size of widgets like Align, which likes to take up an absurd amount of space.
Here's a sample on how you can use LayoutBuilder to determine the widget's size.
Since LayoutBuilder widget is able to determine its parent widget's constraints, one of its use case is to be able to have its child widgets adapt to their parent's dimensions.
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
var dimension = 40.0;
increaseWidgetSize() {
setState(() {
dimension += 20;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(children: <Widget>[
Text('Dimension: $dimension'),
Container(
color: Colors.teal,
alignment: Alignment.center,
height: dimension,
width: dimension,
// LayoutBuilder inherits its parent widget's dimension. In this case, the Container in teal
child: LayoutBuilder(builder: (context, constraints) {
debugPrint('Max height: ${constraints.maxHeight}, max width: ${constraints.maxWidth}');
return Container(); // create function here to adapt to the parent widget's constraints
}),
),
]),
),
floatingActionButton: FloatingActionButton(
onPressed: increaseWidgetSize,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
Demo
Logs
I/flutter (26712): Max height: 40.0, max width: 40.0
I/flutter (26712): Max height: 60.0, max width: 60.0
I/flutter (26712): Max height: 80.0, max width: 80.0
I/flutter (26712): Max height: 100.0, max width: 100.0
Update: You can also use MediaQuery to achieve similar function.
#override
Widget build(BuildContext context) {
var screenSize = MediaQuery.of(context).size ;
if (screenSize.width > layoutSize){
return Widget();
} else {
return Widget(); /// Widget if doesn't match the size
}
}
Let me give you a widget for that
class SizeProviderWidget extends StatefulWidget {
final Widget child;
final Function(Size) onChildSize;
const SizeProviderWidget(
{Key? key, required this.onChildSize, required this.child})
: super(key: key);
#override
_SizeProviderWidgetState createState() => _SizeProviderWidgetState();
}
class _SizeProviderWidgetState extends State<SizeProviderWidget> {
#override
void initState() {
///add size listener for first build
_onResize();
super.initState();
}
void _onResize() {
WidgetsBinding.instance?.addPostFrameCallback((timeStamp) {
if (context.size is Size) {
widget.onChildSize(context.size!);
}
});
}
#override
Widget build(BuildContext context) {
///add size listener for every build uncomment the fallowing
///_onResize();
return widget.child;
}
}
EDIT
Just wrap the SizeProviderWidget with OrientationBuilder to make it respect the orientation of the device
I made this widget as a simple stateless solution:
class ChildSizeNotifier extends StatelessWidget {
final ValueNotifier<Size> notifier = ValueNotifier(const Size(0, 0));
final Widget Function(BuildContext context, Size size, Widget child) builder;
final Widget child;
ChildSizeNotifier({
Key key,
#required this.builder,
this.child,
}) : super(key: key) {}
#override
Widget build(BuildContext context) {
WidgetsBinding.instance.addPostFrameCallback(
(_) {
notifier.value = (context.findRenderObject() as RenderBox).size;
},
);
return ValueListenableBuilder(
valueListenable: notifier,
builder: builder,
child: child,
);
}
}
Use it like this
ChildSizeNotifier(
builder: (context, size, child) {
// size is the size of the text
return Text(size.height > 50 ? 'big' : 'small');
},
)
If I understand correctly, you want to measure the dimension of some arbitrary widgets, and you can wrap those widgets with another widget. In that case, the method in the this answer should work for you.
Basically the solution is to bind a callback in the widget lifecycle, which will be called after the first frame is rendered, from there you can access context.size. The catch is that you have to wrap the widget you want to measure within a stateful widget. And, if you absolutely need the size within build() then you can only access it in the second render (it's only available after the first render).
findRenderObject() returns the RenderBox which is used to give the size of the drawn widget and it should be called after the widget tree is built, so it must be used with some callback mechanism or addPostFrameCallback() callbacks.
class SizeWidget extends StatefulWidget {
#override
_SizeWidgetState createState() => _SizeWidgetState();
}
class _SizeWidgetState extends State<SizeWidget> {
final GlobalKey _textKey = GlobalKey();
Size textSize;
#override
void initState() {
super.initState();
WidgetsBinding.instance.addPostFrameCallback((_) => getSizeAndPosition());
}
getSizeAndPosition() {
RenderBox _cardBox = _textKey.currentContext.findRenderObject();
textSize = _cardBox.size;
setState(() {});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Size Position"),
),
body: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Text(
"Currern Size of Text",
key: _textKey,
textAlign: TextAlign.center,
style: TextStyle(fontSize: 22, fontWeight: FontWeight.bold),
),
SizedBox(
height: 20,
),
Text(
"Size - $textSize",
textAlign: TextAlign.center,
),
],
),
);
}
}
Output:
There is no direct way to calculate the size of the widget, so to find that we have to take the help of the context of the widget.
Calling context.size returns us the Size object, which contains the height and width of the widget. context.size calculates the render box of a widget and returns the size.
Checkout https://medium.com/flutterworld/flutter-how-to-get-the-height-of-the-widget-be4892abb1a2
In cases where you don't want to wait for a frame to get the size, but want to know it before including it in your tree:
The simplest way is to follow the example of the BuildOwner documentation.
With the following you can just do
final size = MeasureUtil.measureWidget(MyWidgetTree());
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
/// Small utility to measure a widget before actually putting it on screen.
///
/// This can be helpful e.g. for positioning context menus based on the size they will take up.
///
/// NOTE: Use sparingly, since this takes a complete layout and sizing pass for the subtree you
/// want to measure.
///
/// Compare https://api.flutter.dev/flutter/widgets/BuildOwner-class.html
class MeasureUtil {
static Size measureWidget(Widget widget, [BoxConstraints constraints = const BoxConstraints()]) {
final PipelineOwner pipelineOwner = PipelineOwner();
final _MeasurementView rootView = pipelineOwner.rootNode = _MeasurementView(constraints);
final BuildOwner buildOwner = BuildOwner(focusManager: FocusManager());
final RenderObjectToWidgetElement<RenderBox> element = RenderObjectToWidgetAdapter<RenderBox>(
container: rootView,
debugShortDescription: '[root]',
child: widget,
).attachToRenderTree(buildOwner);
try {
rootView.scheduleInitialLayout();
pipelineOwner.flushLayout();
return rootView.size;
} finally {
// Clean up.
element.update(RenderObjectToWidgetAdapter<RenderBox>(container: rootView));
buildOwner.finalizeTree();
}
}
}
class _MeasurementView extends RenderBox with RenderObjectWithChildMixin<RenderBox> {
final BoxConstraints boxConstraints;
_MeasurementView(this.boxConstraints);
#override
void performLayout() {
assert(child != null);
child!.layout(boxConstraints, parentUsesSize: true);
size = child!.size;
}
#override
void debugAssertDoesMeetConstraints() => true;
}
This creates an entirely new render tree separate from the main one, and wont be shown on your screen.
So for example
print(
MeasureUtil.measureWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Row(
mainAxisSize: MainAxisSize.min,
children: const [
Icon(Icons.abc),
SizedBox(
width: 100,
),
Text("Moin Meister")
],
),
),
),
);
Would give you Size(210.0, 24.0)
Might be this could help
Tested on Flutter: 2.2.3
Copy Below code this in your project.
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';
class WidgetSize extends StatefulWidget {
final Widget child;
final Function onChange;
const WidgetSize({
Key? key,
required this.onChange,
required this.child,
}) : super(key: key);
#override
_WidgetSizeState createState() => _WidgetSizeState();
}
class _WidgetSizeState extends State<WidgetSize> {
#override
Widget build(BuildContext context) {
SchedulerBinding.instance!.addPostFrameCallback(postFrameCallback);
return Container(
key: widgetKey,
child: widget.child,
);
}
var widgetKey = GlobalKey();
var oldSize;
void postFrameCallback(_) {
var context = widgetKey.currentContext;
if (context == null) return;
var newSize = context.size;
if (oldSize == newSize) return;
oldSize = newSize;
widget.onChange(newSize);
}
}
declare a variable to store Size
Size mySize = Size.zero;
Add following code to get the size:
child: WidgetSize(
onChange: (Size mapSize) {
setState(() {
mySize = mapSize;
print("mySize:" + mySize.toString());
});
},
child: ()
This is Remi's answer with null safety, since the edit queue is full, I have to post it here.
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key}) : super(key: key);
#override
MyHomePageState createState() => MyHomePageState();
}
class MyHomePageState extends State<MyHomePage> {
final controller = ScrollController();
OverlayEntry? sticky;
GlobalKey stickyKey = GlobalKey();
#override
void initState() {
sticky?.remove();
sticky = OverlayEntry(
builder: (context) => stickyBuilder(context),
);
SchedulerBinding.instance
.addPostFrameCallback((_) => Overlay.of(context)?.insert(sticky!));
super.initState();
}
#override
void dispose() {
sticky?.remove();
super.dispose();
}
#override
Widget build(BuildContext context) => Scaffold(
body: ListView.builder(
controller: controller,
itemBuilder: (context, index) {
if (index == 6) {
return Container(
key: stickyKey,
height: 100.0,
color: Colors.green,
child: const Text("I'm fat"),
);
}
return ListTile(
title: Text(
'Hello $index',
style: const TextStyle(color: Colors.white),
),
);
},
),
);
Widget stickyBuilder(BuildContext context) => AnimatedBuilder(
animation: controller,
builder: (_, Widget? child) {
final keyContext = stickyKey.currentContext;
if (keyContext != null) {
final box = keyContext.findRenderObject() as RenderBox;
final pos = box.localToGlobal(Offset.zero);
return Positioned(
top: pos.dy + box.size.height,
left: 50.0,
right: 50.0,
height: box.size.height,
child: Material(
child: Container(
alignment: Alignment.center,
color: Colors.purple,
child: const Text("Nah I think you're okay"),
),
),
);
}
return Container();
},
);
}
use the package: z_tools.
The steps:
1. change main file
void main() async {
runZoned(
() => runApp(
CalculateWidgetAppContainer(
child: Center(
child: LocalizedApp(delegate, MyApp()),
),
),
),
onError: (Object obj, StackTrace stack) {
print('global exception: obj = $obj;\nstack = $stack');
},
);
}
2. use in function
_Cell(
title: 'cal: Column-min',
callback: () async {
Widget widget1 = Column(
mainAxisSize: MainAxisSize.min,
children: [
Container(
width: 100,
height: 30,
color: Colors.blue,
),
Container(
height: 20.0,
width: 30,
),
Text('111'),
],
);
// size = Size(100.0, 66.0)
print('size = ${await getWidgetSize(widget1)}');
},
),
The easiest way is to use MeasuredSize it's a widget that calculates the size of it's child in runtime.
You can use it like so:
MeasuredSize(
onChange: (Size size) {
setState(() {
print(size);
});
},
child: Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
);
You can find it here: https://pub.dev/packages/measured_size
It's easy and still can be done in StatelessWidget.
class ColumnHeightWidget extends StatelessWidget {
#override
Widget build(BuildContext context) {
final scrollController = ScrollController();
final columnKey = GlobalKey();
_scrollToCurrentProgress(columnKey, scrollController);
return Scaffold(
body: SingleChildScrollView(
controller: scrollController,
child: Column(
children: [],
),
),
);
}
void _scrollToCurrentProgress(GlobalKey<State<StatefulWidget>> columnKey,
ScrollController scrollController) {
WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
final RenderBox renderBoxRed =
columnKey.currentContext.findRenderObject();
final height = renderBoxRed.size.height;
scrollController.animateTo(percentOfHeightYouWantToScroll * height,
duration: Duration(seconds: 1), curve: Curves.decelerate);
});
}
}
in the same manner you can calculate any widget child height and scroll to that position.
**Credit to #Manuputty**
class OrigChildWH extends StatelessWidget {
final Widget Function(BuildContext context, Size size, Widget? child) builder;
final Widget? child;
const XRChildWH({
Key? key,
required this.builder,
this.child,
}) : super(key: key);
#override
Widget build(BuildContext context) {
return OrientationBuilder(builder: (context, orientation) {
return ChildSizeNotifier(builder: builder);
});
}
}
class ChildSizeNotifier extends StatelessWidget {
final ValueNotifier<Size> notifier = ValueNotifier(const Size(0, 0));
final Widget Function(BuildContext context, Size size, Widget? child) builder;
final Widget? child;
ChildSizeNotifier({
Key? key,
required this.builder,
this.child,
}) : super(key: key);
#override
Widget build(BuildContext context) {
WidgetsBinding.instance!.addPostFrameCallback(
(_) {
notifier.value = (context.findRenderObject() as RenderBox).size;
},
);
return ValueListenableBuilder(
valueListenable: notifier,
builder: builder,
child: child,
);
}
}
**Simple to use:**
OrigChildWH(
builder: (context, size, child) {
//Your child here: mine:: Container()
return Container()
})