LimitedBox (Flutter Widget of the Week)
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- Опубликовано: 24 июн 2019
- Ever had a widget that misbehaved when given unlimited size to grow? The LimitedBox widget provides size constraints to widgets in cases where their dimensions are unbounded.
Learn more about LimitedBox → goo.gle/2wXZTM8
This video is also subtitled in Chinese, Indonesian, Italian, Japanese, Korean, Portuguese, and Spanish.
Learn everything about Flutter at → goo.gle/2WAhEN1
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Google : how many widgets you want ?
Developers : Yes
After a day of spiralling into a flutter layout rabbit hole, this video is an absolute gem.
I liked this widget. It really helps to set something in default size when parent's size is unknown.
I recognize the voice behind this clip was Emily. Thank you for making these! You guys are awesome!
I'm a simple man. I see a flutter video and I click like!
Then like my flutter video
@@praharshbhatt2934 i'm a simple man, i see a flutter video and i click like! Unless it is made by Praharsh Bhatt.
Bruh i was a menace 💀
@@breh2716 bro starts someone's villain arc 💀
Love these short videos. I don't even use flutter that much, but I remember like all the widget they have shown.
Compare to CSS:
SizedBox: display: inline-block;
LimitedBox: display: block;
Really a useful widget, thanks!
Counter Strike Source?
@@antongrekov7710 Nice ~
I had a hard time understanding constraints coming from CSS. But the moment you said container set their height to 0 when unconstrained. It all clicked! Thanks
I love everything you guys have done. Thanks.
Never heard of it. Will start using it! Thx☺️
This will surely simplify design patterns.
I think the example is not good enough to explain the widget. If it come to "unbounded constraint" from parent, the Sizedbox, ConstraintedBox can also do the same thing for the child.
It is about "if the parent with no constraint, Limitedbox give the child maxSize".
On the other hand, "if the parent with constraint, Limitedbox pass parent's constraint and ignore it own's".
Try the exampe below:
ListView(
children: [
LimitedBox(
maxHeight: 200,
child: Container(color: Colors.green),
),
ConstrainedBox(
constraints: const BoxConstraints(maxHeight: 300),
child: LimitedBox(
maxHeight: 200,
child: Container(color: Colors.blue),
),
),
ConstrainedBox(
constraints: const BoxConstraints(maxHeight: 300),
child: SizedBox(
height: 200,
child: Container(color: Colors.red),
),
),
],
);
This is beautiful💖! I was searching for something like this for an hour now
This is what i want thank you Flutter!😊✌🏻
Very good, very useful.
Awesome one!
You can use this on flutter_web since height is unbounded!
very useful widget!
Awesome video...
For AR android app development in flutter, is vscode editor is enough? . I am on windows 10 G2020 processor and 8gb ddr3 ram
This widget solves the problem when a unbounded horizontal listview is used?
Oke very useful this channel
This should ease many design problems.
i love flutter
Do you guys plan on making some good FlutterFire tutorials?
I love flutter
What if you use ConstrainedBox instead? Seems like has same effect
Why not just set a container's height?
If you don’t know at build time if a component is going to be in an unbounded parent or now you can wrap it in this. Think dynamic user interfaces.
Please make video on How to write efficient code?
Nobody but yourself will help you with that.
Could you be more specific? Efficient in what sense?
@@eshansingh1 in format
Check out the boring flutter podcast. It's a great resource.
(sigh) Seriously?
how is this different than SizedBox? can someone explain?
LimitedBox will get ignored once the parent already have size.
Sizedbox always constraints its children but this constrains it only if parent doesnt. This could be usefull to have in child component. Put this on your child components as topmost widget and you have a widget that constrains itself when its parent doesnt! Like in a column or list. But somewhere else if parent constrains it, it respects the parents constrains.
Simple e amazing
What program did they use to make these animations? Powerpoint?
Is there a solution for a login screen to distribute the children equally in portrait also scroll in landscape or when there's not enough space?
there are a number of ways to do it :
for equally distribution of screen height and width - crossAxisAllignment.spaceAround or mainAxisAllignment.spaceAround
for perfect screen to fields ratio while in portrait or landscape mode - use MEDIA QUERY
for custom space arrangement - use EXPANDED with FLEX
COMBINE EVERYTHING TO GET THE BEST RESULT
@LP Square That's what I ended up doing. But I'm having to put an arbitrary value for checking the height. It works for the purpose. But I was thinking if there's some better way so that instead of a hard coded height value how can we set the break point depending on the actual measured height of all widgets.
thank for sharing
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Just give height to the container?
The more I use Flutter, the more I like it, but the less forethought I think went into a lot of it. A lot of the specialty widgets could simply be optional parameters on (most?) every other widget of similar type. For instance, Expanded, LimitedBox, AnimatedContainer, (maybe a few more), and Container should all just be.... Container with a comprehensive set of properties. And a container with both a color and a box decoration shouldn't toss and exception. Container->Decoration->Color should simply supercede Container->Color because, ya know, Decoration takes more choices and thought to put in place, and would rarely show up by accident. Some really wacky choices were made expanding Flutter from inception, methinks.
While we can discuss the validity of it, the approach of "lots of small widgets" instead of "lots of optional parameters" was a design choice from the start. It's discussed in the official docs, "Flutter architectural overview" section "Composition":
"The class hierarchy is deliberately shallow and broad to maximize the possible number of combinations, focusing on small, composable widgets that each do one thing well. Core features are abstract, with even basic features like padding and alignment being implemented as separate components rather than being built into the core. (This also contrasts with more traditional APIs where features like padding are built in to the common core of every layout component.)"
It's a little hard to follow and understand at same for no English speakers xD but these videos are great
very nice
Thank you Heshan! 🙌
can't we set a height to the container itself instead of wrapping it in a limitedbox?
container doesn't have maxHeight
..
its working without limited box :D
what's the difference compared to SizedBox？
Why not set the container constraint ?
Can’t you just do this with a container and set he height and width?
Like she said in the video.. a Container always passes its constraints down to its child. This LimitedBox is basically a container that conditionally passes its constraints: only if the limitedbox's parent doesn't have them.
😍
Ummm why not just sized box?
👍👍👍
Interning..
My index finger pressed thumb up automatically.
what would be the difference if I just set constraints on a ListView child? Consider this example:
ListView(
children: [
Container(
constraints: BoxConstraints(maxHeight: 200.0),
color: Colors.teal[100],
)
],
);
This is usefull when you dont have control over the parent. So you put this on your child widget as topmost widget. For example Your code puts a fixed constraint. This one is disabled if there is a constraint on its parent, if not fixed box constraints apply. So you can be sure there will alvays be a constraint applying to your child.
exactly I was thinking of it !!
Or simply
ListView(
children: [
Container(
height: 200.0,
color: Colors.teal[100],
)
],
);
Documentation needs to be upgraded. There are lot of widgets, can't find which one perfectly fits my situation! 😒
Why use LimitedBox instead of SizedBox?
From @Alper Tokcan:
Sizedbox always constraints its children but this constrains it only if parent doesnt. This could be usefull to have in child component. Put this on your child components as topmost widget and you have a widget that constrains itself when its parent doesnt! Like in a column or list. But somewhere else if parent constrains it, it respects the parents constrains.
I don't get it @Emily.. inside listView children container when we set the height to some, we can attain the same output as shown in this video rit!! Or I'm missing something.. when actually this limited box required.. still confusing..
Sounds like constrained box
Do you know what the difference between them?
nightmare for nest widget
Ok
Why use a limited box instead of a sized box?
because sized box has a fixed size, limited size will let it's child take any size it wants but not allowing it to exceed the "maxHeight" you set in the limitedBox
@@marana.th4 thank you
BoxConstraints.maxheight.
First
Instead of having a billion different widgets, why not make it more like html where you can do everything with a div?
Ummm why not just sized box?