I show dialog with list inside it.
showDialog(
context: context,
builder: (context) {
return AlertDialog(
title: Text(select_conference),
content: ListView.separated(
itemCount: selected.length,
separatorBuilder: (context, index) => CommonDivider(),
itemBuilder: (context, index) => ListTile(...),
),
);
});
But no matter how many elements is has - dialog fills all available height. Is there any solution to solve this without calculating height of list elements?
Wrap your content with a Column and set mainAxisSize to MainAxisSize.min:
AlertDialog(
content: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
//your content
],
),
You can wrap it inside a SizedBox or ConstrainedBox
ConstrainedBox(
constraints: BoxConstraints(maxHeight: 100.0),
child: AlertDialog(
...
),
);
Alternatively, you can set shrinkWrap to true in your ListView so that it takes the least amount of vertical space necessary.
ListView(
shrinkWrap: true,
...
)
A Dialog's insetPadding property controls the padding around the dialog so you could set values to effectively reduce the height / width of the dialog, e.g.
showDialog(
context: context,
builder: (context) {
return AlertDialog(
insetPadding: EdgeInsets.symmetric(
horizontal: 50.0,
vertical: 100.0,
),
title: Text('...'),
content: Text('...'),
);
});
Related
I have this code:
Widget build(BuildContext context) {
return Scaffold(
floatingActionButton: FloatingActionButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => addProductClass()),
);
},
child: const Icon(
Icons.add,
color: Colors.black,
),
),
body: Column(children: [
FutureBuilder(
future: getDocId(),
builder: (context, snapshot) {
return ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: dataIDs.length,
itemBuilder: (BuildContext context, int index) {
return GetProduct(
documentId: dataIDs[index],
);
},
);
}),
Text("text")
]));
}
And i want to use scrollDirection: Axis.horizontal for listview. When I insert this value, I got the error:
Horizontal viewport was given unbounded height
Viewports expand in the cross axis to fill their container and '
'constrain their children to match their extent in the cross axis. '
'In this case, a horizontal viewport was given an unlimited amount of '
'vertical space in which to expand
How can I resolve this?
Easiest way is to provide a fixed height, either using a SizedBox or a ConstrainedBox with a maxHeight set.
Try to set shrinkwrap to true for listview builder
here is an example of listview builder in horizontal mode :
SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: ListView.builder(
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
scrollDirection: Axis.horizontal,
itemCount: 10,
itemBuilder: (BuildContext context, int index){
return Container( margin: EdgeInsets.all(5), height:10, width:20, color:black);
}
),
),
hope it will help !
I'm trying to create a draggable bottom sheet that will have a set header & footer. Between those, the body/content will vary. There may be an empty state or there may be a list of data. The user should be able to expand this sheet to the top of the screen as well.
Here is a base example where I can see all the data, but I can't get it to drag up to the max size. I can only scroll within that ListView between the header & footer.
How can I update this so I can still drag the sheet to snap to the top, or back to the middle, or dismiss?
Code Example:
void _showDraggableSheet(context) {
showModalBottomSheet(
context: context,
isScrollControlled: true,
useRootNavigator: true,
builder: (_) {
return DraggableScrollableSheet(
expand: false,
initialChildSize: 0.65,
minChildSize: 0.65,
maxChildSize: 0.9,
builder: (_, controller) {
return Container(
color: Colors.black,
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
_buildHeader(),
_buildContent(),
_buildFooter(),
],
),
);
},
);
},
);
}
Widget _buildContent() {
return Expanded(
child: Container(
color: Colors.green,
child: ListView.builder(
itemCount: 100,
itemBuilder: (_, i) => ListTile(title: Text('Item $i')),
),
),
);
}
I have several containiers inside a ListView which will result in a scrollable content within a page. Each container has a Column as child and within the Column I have a title and a divider, then the actual content.
I want one of the container to be something like:
Title
--------- (divider)
Scrollable content (most likely a ListView)
What I have so far:
Container(
height: 250,
child: Column(children: <Widget>[
Text('Title'),
Divider(),
SingleChildScrollView(
child: ListView.builder(
shrinkWrap: true,
itemCount: 15,
itemBuilder: (BuildContext context, int index) {
return Text('abc');
}
)
)
]
)
The thing is that I want the container to have a specific height, but I get an overflow pixel error.
Wrap your ListView with Expanded. Remove your SingleChildScrollView as ListView has its own scrolling behaviour. Try as follows:
Container(
height: 250,
child: Column(children: <Widget>[
Text('Title'),
Divider(),
Expanded(
child: ListView.builder(
shrinkWrap: true,
itemCount: 15,
itemBuilder: (BuildContext context, int index) {
return Text('abc');
}
),
)
]
))
Wrap your ListView.builder() widget inside a SizedBox() widget and specify available height after accommodating Title() widget.
Container(
height: 250,
child: Column(children: <Widget>[
Text('Title'),
Divider(),
SizedBox(
height: 200, // (250 - 50) where 50 units for other widgets
child: SingleChildScrollView(
child: ListView.builder(
shrinkWrap: true,
itemCount: 15,
itemBuilder: (BuildContext context, int index) {
return Text('abc');
}
)
)
)
]
)
You can also use Container() widget instead SizedBox() widget but only if needed.
SizedBox() is a const constructor where Container() widget is not, so SizedBox() allows the compiler to create more efficient code.
Both Listview and Gridview needs height to be shown into our app.
But each model of phone has different size as height so it is impossible to define static height of the parent container of the list.
What I need to put as height for the container once use listview and gridview to cover all the phone model ?
Code:
Container(
height: 500,
child: GridView.builder(
itemCount: 20,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 3,
),
itemBuilder: (BuildContext context, int index){
return GestureDetector(
onTap: () => showDialog(
context: context, builder: (context) => AlertDialog(
actions: [
Image.asset(widget.user.imageUrl),
Text(widget.user.name),
],
)
),
child: Card(
elevation: 5,
child: Image.asset(widget.user.imageUrl),
),
);
},
),
),
in this specific case height is 500 and it is good for some mobile phone but for other no, please let me know.
You can use screen height width for make it responsive according to devices:
height: MediaQuery.of(context).size.height * 0.1 //It takes 1 of 10 proportion of screen height
width: MediaQuery.of(context).size.width* 0.2 //It takes 2 of 10 proportion of screen width
You can place your GridView or ListView inside Expanded widget. The Expanded widget will take all the available space & you can easily show your GridView or ListView widget.
This solution will work on multiple screen sizes also without any problem because it will occupy the available space on its own.
Column(
children: [
// Any other widget
Expanded(
child: GridView.builder(
itemCount: 20,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 3,
),
itemBuilder: (BuildContext context, int index){
return GestureDetector(
onTap: () => showDialog(
context: context, builder: (context) => AlertDialog(
actions: [
Image.asset(widget.user.imageUrl),
Text(widget.user.name),
],
),
),
child: Card(
elevation: 5,
child: Image.asset(widget.user.imageUrl),
),
);
},
),
),
// Any other widget
],
),
I want to display some option in the bottom of Flutter AlertDialog. As you can see
If I understand correctly you can use the showDialog component which lays behind the AlertDialog with a nested Column. For a greyed out background ou can use Opacity with a Container:
showDialog(
context: context,
builder: (context) {
return Opacity(
opacity: 0.8, // some opacity
child: Container(
// container to set color
color: Colors.grey,
child: Column(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.end,
children: [
RaisedButton(
onPressed: null,
), // replace with your buttons
RaisedButton(
onPressed: null,
),
]
)
)
);
}
);
Simple way: you can use padding
showDialog<String>(
context: context,
barrierDismissible: true,
builder: (BuildContext context) {
return Padding(
padding: const EdgeInsets.only(top:300.0),
child: //AlertDiloag / CupertinoAlertDialog
);
},
);