In my configuration I have this:
Expanded(
flex: 1,
child: ListView(
scrollDirection: Axis.horizontal,
children: <Widget>[
Container(
width: 100,
height: 200,
color: Colors.red,
),
Container(
width: 100,
height: 200,
color: Colors.blue,
),
],
),
),
Here, it works but each container take 100 fixed length width.
If I replace
width: 100,
by
width: double.infinity / 2,
nothing appears
and
If I replace it by
width: MediaQuery.of(context).size.width / 2,
In portrait mode it's good but in landscape mode I have a problem of gap in the left of the screen
Related
My use case is:
There are 3 widgets in a Column: widgets 1 and 3 are fixed height, and widget 2 will expand the available content.
Container(
height: 300, // h0: dynamic height
child: Column(
children: [
Container(
color: Colors.green,
width: 100, // h1: fixed height
height: 100,
),
Expanded(
child: Container(
color: Colors.red,
width: 100, // h2: fill remain content
child: Placeholder(),
),
),
Container(
color: Colors.blue,
width: 100, // h3: fixed height
height: 100,
),
],
),
)
When h0 > h1 + h3:
Show all 3 widgets -> Passed
When h0 < h1 + h3:
Show widgets 1 and 3, the widget in Expanded will be invisible -> Passed
Clip the content if overflow -> Failed the content is not clipped and a warning Bottom overflow
I cannot use ScrollView because the content in Expanded should be flexible which ScrollView does not support behavior like that.
I can use ClipRect to clip the overflow content but the warning Bottom overflow still remains. Is there a way to dismiss the warning?
Try wrapping Column with SingleChildScrollView:
Container(
height: 300, // h0: dynamic height
child: CustomScrollView(
slivers: [
SliverFillRemaining(
hasScrollBody: false,
child: Column(
children: [
Container(
color: Colors.green,
width: 100, // h1: fixed height
height: 100,
),
Expanded(
child: Container(
color: Colors.red,
width: 100, // h2: fill remain content
child: Placeholder(),
),
),
Container(
color: Colors.blue,
width: 100, // h3: fixed height
height: 100,
),
],
),
),
],
),
),
You can try it :
Container(
height: 300,
child: SingleChildScrollView(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Container(
color: Colors.green,
width: 100, // h1: fixed height
height: 100,
),
Flexible(
fit: FlexFit.loose,
child: Container(
color: Colors.red,
width: 100, // h2: fill remain content
child: Placeholder(),
),
),
Container(
color: Colors.blue,
width: 100, // h3: fixed height
height: 100,
),
],
),
),
),
I want to put another widget on the top corner of a container, and I want to put it slightly out of the container as in the picture below.
Use Stack widget and set its clipBehavior to none:
Stack(
clipBehavior: Clip.none, // <--- important part
children: [
Container(
width: 200,
height: 100,
color: Colors.blue,
),
Positioned(
right: -10,
top: -10,
child: Container(
width: 50,
height: 20,
color: Colors.green,
),
),
],
),
SingleChildScrollView(
child: Column(
children: [
Container(
height: 200.0,
width: double.infinity,
color: myBlue.withOpacity(.6),
child: TopCarouselSlider(bgColor: null),
),
//
Container(
height: MediaQuery.of(context).size.width * 1,
width: MediaQuery.of(context).size.width * 0.90,
color: myBlue.withOpacity(.5),
//
child: GridView.count(
mainAxisSpacing: 8,
crossAxisSpacing: 8,
crossAxisCount: 2,
children: [
Container(
height: 200.0,
width: 150.0,
color: myAccent,
),
Container(
height: 150.0,
width: 150.0,
color: myAccent,
),
Container(
height: 150.0,
width: 150.0,
color: myAccent,
),
Container(
height: 150.0,
width: 150.0,
color: myAccent,
)
],
),
),
],
),
),
Issue: If I try to scroll the page with the slide gesture inside the GridView area I don't get the scroll effect. Is this means that inside SingleChildScrollView the usual effects scroll for Grid or List will not work?
Please note I tried with GridView.Builder too, but the same result. Cannot figure a solution!
Thanks in advance for your help
you can do that using NestedScrollView or CustomScrollView, and it will work with sliverGrid and SliverList, but the problem is you can't add normal RenderBox widget like Container be the parent of the Slivers,
Is something wrong with this snippet? The positioned element isn't showing up but the others are. deviceHeight is defined elsewhere as the height of the device.
The first container holds the other two containers under it. The second container appears at the top correctly, but the third one (positioned) which should be under the second one doesn't appear. Welcome to hear any alternatives.
Align(
alignment: Alignment.bottomCenter,
child: Stack(children: <Widget>[
Container(
color: Color(bgDark),
height: deviceHeight / 100 * 40,
),
Container(color: Colors.red, height: deviceHeight / 18),
Positioned(
top: 50,
child: Container(
color: Colors.green, height: deviceHeight / 1))
]))
Adding a width to the Positioned Container made it visible.
Align(
alignment: Alignment.bottomCenter,
child: Stack(
children: <Widget>[
Container(
color: Colors.blue,
height: 300,
),
Container(
color: Colors.red,
height: 200,
),
Positioned(
top: 50,
child: Container(
color: Colors.green,
height: 100,
width:100,
),
),
],
),
);
I am not sure about the exact cause of the issue but it seems Positioned needed both height and width dimensions.
If I set the height of the green container to MediaQuery.of(context).size.height/2 it's work as expected, But set the height of the green container to MediaQuery.of(context).size.height/3 causes the green container to cut the blue container.
How do I get over this?
Stack(
children: <Widget>[
Container(
height: MediaQuery.of(context).size.height/3,
color: Colors.green,
),
Positioned(
top: 80,
right: 30,
left: 30,
child: Container(
height: 200,
width: 400.0,
))
For some reason the green container is working as the "main screen" and it's positioning the rest of the Stack children into it.
So... I just wrapped the main Container into a Column (I think you could use any multi-child layout) and it works as expected.
body: Stack(
children: <Widget>[
Column(
children: [
Container(
height: MediaQuery.of(context).size.height / 3,
color: Colors.green,
),
],
),
Positioned(
top: 80,
right: 30,
left: 30,
child: Container(
color: Colors.blue,
height: 200,
width: 400.0,
),
),
],
),
);
Hope it helps you.