Is there a way to make a widget, for instance a Container, always expand to a screen border, not dependent of a specific widget tree structure?
Containers impose constraints on their children so you can't make a child's width bigger than its parent when it is a container
some tips :
you can use the Expanded widget to take all the remaining space
to take all the size of the screen you can use width: double.infinity
As they said already, in Container() you can use width: double.infinity or width: MediaQuery.of(context).size.width. But for this, the parent of Container can't have a size smaller than the screen.
Related
I'm having a bunch of widgets (dynamically sized) in a ListView, and I want each of those widgets to be exactly 300 pixels. How is it possible?
(Note: Using SizedBox along with BoxFit.contain makes some of widgets too small; I want it to be cropped).
Use BoxFit.cover instead of contain to crop it. BoxFit.contain will shrink it to fit in its parent.
For more info check this out
https://api.flutter.dev/flutter/painting/BoxFit-class.html
Container(
height: min(
widget.order.products.length * 20.0 + 10,
100,
),)
widget.order.products.length => will return me the list of dynamic products.
While viewing the list of these products, I want the set the height of the container dynamic which I'm not able to do with the "min" function.
Can anyone help me.
Thanks in advance.
This can be done by using an IntrinsicHeight:
https://api.flutter.dev/flutter/widgets/IntrinsicHeight-class.html
A widget that sizes its child to the child's intrinsic height.
This class is useful, for example, when unlimited height is available and you would like a child that would otherwise attempt to expand infinitely to instead size itself to a more reasonable height.
The constraints that this widget passes to its child will adhere to the parent's constraints, so if the constraints are not large enough to satisfy the child's maximum intrinsic height, then the child will get less height than it otherwise would. Likewise, if the minimum height constraint is larger than the child's maximum intrinsic height, the child will be given more height than it otherwise would.
This van be put Around things like a listView, Column etc.
I have a Column that holds an array of Container Widgets. The Height of one of these Container Widgets is dependent on the Heigth of the Rich Text Widget it holds, for better understanding here is a screenshot:
I want the History Container to be the same height as all the other ones, is there an elegant solution to do this?
You can give a fixed height to a container ! and set text to fit in one line Text('Name',maxLines: 1,), so it will take same height in all row.
or
Alternatively you can add a empty Text widget as subtitle(grey one) in History row.
like -> Text(" ", style:TextStyle()) Give it same style as other subtitle. as result Text widget will take it space like other but wont be visible to UI.
By wrapping every widget on your Column with an Expanded widget, they will all share the same height.
Card, by default, assumes the size of its child. So, if we want to change the size of that card, then we also need to change the size of its child.
Text, on the other hand, is a widget. Which, by default, only takes as much space as this text needs. Therefore, if you want to change the size of Text, you need to also change the size of its parent. Since the Card depends on the child and the Text depends on the parent.
Card by default does not have any height or width. The width/height depends on the Child or the Card. In the screenshot, the child here is Text() Widget. The Text widget takes as much space as it's font size. So more the font size is, the larger will be Card.
The last part of the explanation is incorrect. You can't change parent size here as "Card" widget does not has any size properties. So if u want bigger card and small text, use "Container" Widget instead of Card. Almost all developers use Container only to create Card. Container has more feature then a card has.
Container(
height: 100,
width: 100,
child: Material(
elevation: 5,
child: Text("Chart!"),
),
)
I am learning flutter and currently switched from android to flutter.In flutter i mostly get an error something like
bottom overflowed by 234 pixels or renderbox overflowed by 340 pixels.And i fixes that problem by increase the height of the widget.If so then how to know that what much size giving to widget.I mean in android we can declare the height of the layout to be wrap content and its works perfectly.Please explain me that how can i avoid this situation because if i fixes the issue by changing the height of widget in one device then in devices of other screen sizes if throws same error ?Here is a image which throws an error.Ignore the red error , see the error in below screen.Thanks in advance.
!https://imgur.com/a/PsZzeMp
If you want to give fixed width and height to your widgets wrap it with SizedBox.
You can specify fixed width and height and you child widget will be the exact dimension.
If you want one of the dimension fixed and the other as big as the parent widget, you can try something like this:
SizedBox(
width: double.inifinity,
height: 50.0
child: Conttainer()
)
If you are worried about giving fixed dimensions. You can give the height or width according to the ratio of the screen size. You can get the height and width of the screen like this:
double width = MediaQuery.of(context).size.width;
Use the above value to give the width to your widgets like below:
Container(
width: MediaQuery.of(context).size.width * 0.8,
height: 100,
)
To answer question in the comment. You can do the following to wrap the text with dynamic content.
ConstrainedBox(
constraints: BoxConstraints(
maxWidth: 100
),
child: Text(
'ADASFASF ssss'
),
)
The above code will wrap the text to next line if the text widget is more than 100 pixels wide. As we don't have any constraints on the height.
Overflow happens when the minimum size of a child widget is bigger than the parent's constraints (width and/or height).
Which means you can:
make the parent widget bigger (eg: SizedBox(height:, width:,))
make the child smaller (eg: using a FittedBox(fit: BoxFit.scaleDown) widget)
Though the first method will not allow you a size bigger than the parent's parent widget. It should be enough to build the children relatively to their parents and not the other way.
In your case, it seems like you text + image widget is taking a little too much space. I recommend wrapping it in a FittedBox that will scale down the child widget until it fits in you bottom bar.
FittedBox(
fit: BoxFit.scaleDown,
child: _buildChildWidget(),
)
You can then wrap it in other widgets to build the layout you want (Row, Expanded, Flexible, LayoutBuilder, ...).
As the overflow issue usually happens because text or images are too big. A good exercise is trying to make your app work while setting text size to the maximum value allowed by the accessibility options of your device. You can do the same with images by setting an image size relative to your text size for example.
Paddings and margins can also cause problems because they leave less space for the child widget.