I'm currently working on a chat app's interface on flutter. I tried to customize the chat message with the following container, to show a vertical line beside each message, like Snapchat does:
child: new Container(
margin: const EdgeInsets.symmetric(vertical: 10.0),
child: new Row(
mainAxisAlignment: MainAxisAlignment.end,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
new Container(
alignment: Alignment.centerRight,
width: 300.0,
child: new Text(text),
),
new Container(width: 2.0, height: 10.0, color: Colors.amber, child: null)
],
),
)
Problem is, this:
new Container(width: 2.0, height: 10.0, color: Colors.amber, child: null)
When I specify an explicit height, like the 10.0 above, it doesn't scale with the message, it just stays at the top like this:
So I was wondering if there was a way to scale the height for the line(container) dynamically as the other container for the message Text increases in height.
LayoutBuilder is what you want.
The builder delegate receives a BoxConstraint as parameter, corresponding to the container's size.
While the answer by Darky is correct, in your case, you don't need to know the container dimensions. A much simpler way is to just have a border on the right side of your container.
For example:
new Container(
margin: const EdgeInsets.symmetric(vertical: 10.0),
decoration: new BoxDecoration(
border: new Border(
right: new BorderSide(
width: 2.0,
color: Colors.amber,
),
),
),
child: new Text('Hello World!'),
);
Related
I am trying to create a listview with an image and vertical line at the start of the list tile. I will try to explain with an image.
I have tried using a stack with a container for the vertical line, and then an image right after, but it didn't work. I also tried adding a Position.fill to the vertical line, which also didn't work.
Row(
children: <Widget>[
Stack(
children: <Widget>[
new Image(image: new AssetImage("assets/img/airplane.png")),
Positioned.fill(
child: Container(
height: 1.0,
width: 3.0,
color: Colors.green,
margin: const EdgeInsets.only(left: 30.0, right: 10.0),
),
),
],
)
],
),
This is what i am trying to achieve.
An example of an app on the store that does what I am trying to achieve:
Here an example:
class MainPageState extends State<MainPage> {
//State must have "build" => return Widget
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Stack(alignment: const Alignment(0.0, 0.0), children: <Widget>[
Container(
//Do you need to make Image as "Circle"
child: Image.asset('images/sanBernardo1.jpg',
width: 150.0, height: 150.0, fit: BoxFit.fill),
),
Positioned(
left: 50.0,
child: Container(
width: 12.0,
height: 100.0,
padding: const EdgeInsets.all(5.0),
decoration: BoxDecoration(color: Colors.red[400])),
)
]));
}
}
Hope this help.
The correct widget for this case is Stepper
https://api.flutter.dev/flutter/material/Stepper-class.html
So, you can create progress through a sequence of steps with a lot of built-in functionality.
Also, it could be useful take a look to Material style guide https://material.io/archive/guidelines/components/steppers.html#
I need to rotate a text inside a card. What I would like to obtain is this:
But I don't know how can i do this with flutter. The problem I am facing is that the text view exceeds the card.
Here is what I have so far:
Widget cardDetails(String title, String imgPath) {
return Material(
elevation: 8.0,
borderRadius: BorderRadius.circular(15.0),
child: Container(
height: 135.0,
width: 135.0,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8.0), color: Colors.white),
child: Stack(
alignment: Alignment.topLeft,
children: <Widget>[
Transform.rotate(
angle: -pi / 4,
child: Container(
height: 15.0,
width: 55.0,
alignment: Alignment.topCenter,
color: const Color(0xFFFFd77B),
child: Text(
title,
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.white,
fontSize: 12.0,
),
),
),
),
],
),
),
);
}
And here it's how it looks like:
Thanks in advance
The simplest way to make a banner is to use the Banner widget. However, it still paints outside the bounds of the item you're using, and unfortunately is not nearly as configurable as it could be (and doesn't handle things like longer text).
To fix the painting outside the bounds, all you need to do is add a ClipRect right under your card widget, and that should fix the overflow with the Banner widget or for what you're doing with the rotated box.
Depending on how configurable you need the banner to be, you could re-implement the Banner widget - using TextPainter you could figure out the length of the text and resize automatically based on it if need be (and to remove the dropshadow...)
I want to make my TextField height the same as my container height. Please check my code below and let me know how can I make TextField match_parent of my container. I've checked this question The equivalent of wrap_content and match_parent in flutter? but I didn't find any solution. I need to make TextField to take full height and width of my container.
new Container(
height: 200.0,
decoration: new BoxDecoration(
border: new Border.all(color: Colors.black)
),
child: new SizedBox.expand(
child: new TextField(
maxLines: 2,
style: new TextStyle(
fontSize: 16.0,
// height: 2.0,
color: Colors.black
),
decoration: const InputDecoration(
hintText: "There is no data",
contentPadding: const EdgeInsets.symmetric(vertical: 40.0),
)
),
),
)
Please check the screenshot below. As said, I need my TextField to take full height of Container
Here is my solution:
Container(
height: 200,
color: Color(0xffeeeeee),
padding: EdgeInsets.all(10.0),
child: new ConstrainedBox(
constraints: BoxConstraints(
maxHeight: 200.0,
),
child: new Scrollbar(
child: new SingleChildScrollView(
scrollDirection: Axis.vertical,
reverse: true,
child: SizedBox(
height: 190.0,
child: new TextField(
maxLines: 100,
decoration: new InputDecoration(
border: InputBorder.none,
hintText: 'Add your text here',
),
),
),
),
),
),
),
It works pretty good for me. And here is a screen shot.
Answering this in 2021. There is an expands property available now. This code works:
Column(
children: [
Expanded(
child: TextField(
maxLines: null,
minLines: null,
expands: true,
),
flex: 1),
],
)
Let's remove a few lines in code and understand how flutter works.
Why we are giving height 200 to Container. Can't the Container adjust the height based on its child (in this case SizedBox.expand)
If we remove height 200, then Container occupied the entire screen because of SizedBox.expand
Do we really need the SizedBox for our use case. Let's remove that also see what happens.
Now our Container wraps the TextField. But there is some space above and below.
Who decided that space? TextField's decoration's contentPadding. Let's remove that also. It looks like below where textField wrapped by Container. Hope this is what you want. If not, please comment, we can tweak a bit and get what you want. Cheers
Final version of code which displays the above image
new Container(
// height: 200.0,
decoration: new BoxDecoration(
border: new Border.all(color: Colors.black)
),
child: new TextField(
maxLines: 2,
style: new TextStyle(
fontSize: 16.0,
// height: 2.0,
color: Colors.black
),
decoration: const InputDecoration(
hintText: "There is no data",
// contentPadding: const EdgeInsets.symmetric(vertical: 40.0),
)
),
)
Currently the only way to achieve the TextField to fill the available vertical space is:
TextField(maxLines: 1000000) //maxlines: any large int
While it is tempting to use TextField(maxLines: null), it will just set the TextField to expand with its content, until it reaches its container limit.
I think there needs to be a bool stretchVertically parameter. TextField(stretchVertically: true) would mean that the TextField will try to fill as much vertical space as it can. stretchVertically and maxLines would have to be mutually exclusive.
I'm looking for a way to set the height to a Drawer Header.
I have this DrawerHeader:
DrawerHeader(
child: Text('Categories', style: TextStyle(color: Colors.white)),
decoration: BoxDecoration(
color: Colors.black
),
margin: EdgeInsets.all(0.0),
)
)
But I don't see a way to set the Height to the Drawer, that's too big.
You wrap this with a SizedBox widget.
const SizedBox(
height: 64.0,
child: DrawerHeader(
child: Text('Categories', style: TextStyle(color: Colors.white)),
decoration: BoxDecoration(color: Colors.black),
margin: EdgeInsets.all(0.0),
padding: EdgeInsets.all(0.0),
),
);
You can use SizedBox widget for resize height DrawerHeader
new SizedBox(
height : 120.0,
child : new DrawerHeader(
child : new Text('Categories', style: TextStyle(color: Colors.white)),
decoration: new BoxDecoration(color: Colors.black),
margin : EdgeInsets.zero,
padding: EdgeInsets.zero
),
);
Use SizedBox.
A Container is a heavier Widget than a SizedBox, and as bonus, SizedBox has a const constructor.
Like the previous answers, I would put my Drawer in a SizedBox. Since it is also important for me to controll where the Drawer appears, which by default should be the centerLeft, I would make the child of the box an Align with an alignment = Alignment.topLeft. See example below.
Align(
alignment: Alignment.topLeft,
child: SizedBox(
height: 300,//Your height goes here
child: Drawer(
backgroundColor: Colors.white, //Your background color goes here.
child: ListView(
children: [ ... ],
),
),
),
);
I am using Flutter for my app development.
I would like to overlay a poster image view on top of a background image just like in this screenshot below.
The code snippet below does this, but it requires me to also position every other widget including the movie title, release date, etc based on poster's position and background image's position, which is not reliable across several devices and orientation. Is there an example or suggestion to solve this problem?
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new PlatformAdaptiveAppBar(
title: new Text(widget.movie.title),
),
body: new Container(
constraints: new BoxConstraints.expand(),
child: new Stack(
children: <Widget>[
new Container(
child: new Image(
image: new AdvancedNetworkImage(
movieGridUtil.getUrlFromPath(widget.movie.backdrop_path,
MovieGridImageTypes.BACKDROP),
useMemoryCache: false,
useDiskCache: true)),
constraints: new BoxConstraints.expand(height: 250.0),
),
new Positioned(
left: 12.0,
top: 220.0,
child: new Image(
width: 100.0,
height: 150.0,
image: new AdvancedNetworkImage(
movieGridUtil.getUrlFromPath(widget.movie.poster_path,
MovieGridImageTypes.POSTER),
useMemoryCache: false,
useDiskCache: true),
)),
],
)),
);
}
Create Stack
Then inside Stack add Column and make full layout without the poster.
Then as a second Child of Stack, add this combination:
new Stack(
children: [
new Column(
children: _layout()
new Positioned(
top:200,
left:50,
child: _child // or optionaly wrap the child in FractionalTranslation
)]
)
)
Stack(
children: <Widget>[
Container(
color: Colors.blue,
height: 200.0,
),
Padding(
padding: const EdgeInsets.only(left: 20.0,right: 20.0, top:160.0),
child: Container(
color: Colors.pink,
height: 150.0,
width: 110.0,
),
)
],
),
By Creating the Stack,
You can add multiple Container, whichever is last added will be on the top.
Stack(
children: <Widget>[
Container(
color: Colors.blue,
height: 200.0,
),
Padding(
padding: const EdgeInsets.only(left: 20.0,right: 20.0, top:160.0),
child: Container(
color: Colors.pink,
height: 150.0,
width: 110.0,
),
)
],
),