The equivalent of wrap content and match parent in flutter

Question

In Android match parent and wrap content are used to resize the widgets automatically relative to their parent to the content the widget contains   In Flutter it seems by default all widgets are set to wrap content  how would I change it such that I can fill its width and height to that of its parent

User · Answer

Use the widget Wrap    For Column like behavior try     return Wrap            direction  Axis vertical            spacing  10            children   lt Widget gt            For Row like behavior try     return Wrap            direction  Axis horizontal            spacing  10            children   lt Widget gt            For more information  Wrap  Flutter Widget

User · Answer

You can do with little Trick  Suppose you have requirement of     Width Height    Wrap content  Wrap content        use this as child  Wrap    children   lt Widget gt   your child      Match parent Match parent       use this as child Container          height  double infinity      width  double infinity child  your child     Match parent Wrap content        use this as child Row    mainAxisSize  MainAxisSize max    children   lt Widget gt   your child         Wrap content  Match parent       use this as child Column    mainAxisSize  MainAxisSize max    children   lt Widget gt  your child

User · Answer

I used this solution  you have to define the height and width of your screen using MediaQuery    Container          height  MediaQuery of context  size height          width  MediaQuery of context  size width

User · Answer

There are actually some options available   You can use SizedBox expand to make your widget match parents dimensions  or SizedBox width  double infinity  to match only the width or SizedBox heigth  double infinity  to match only the heigth   If you want a wrap content behavior it depends on the parent widget you are using  for example if you put a button on a column it will behave like wrap content and to use it like match parent you can wrap the button with a Expanded widget or a sizedbox   With a ListView the button gets a match parent behavior and to get a wrap content behavior you can wrap it with a Flex widget like Row   Using an Expanded widget makes a child of a Row  Column  or Flex expand to fill the available space in the main axis  e g   horizontally for a Row or vertically for a Column   https   docs flutter io flutter widgets Expanded-class html  Using a Flexible widget gives a child of a Row  Column  or Flex the flexibility to expand to fill the available space in the main axis  e g   horizontally for a Row or vertically for a Column   but  unlike Expanded  Flexible does not require the child to fill the available space  https   docs flutter io flutter widgets Flexible-class html

User · Answer

A simple workaround    If a container has only one top level child  then you can specify alignment property for the child and give it any available value  it ll fill all the space in the container   Container color Colors white height 200 0 width 200 0   child Container      color  Colors yellow      alignment Alignment  any available option     make the yellow child match the parent size          Another way   Container color Colors white height 200 0 width 200 0   child Container      color  Colors yellow      constraints   BoxConstraints expand height  100 0      height will be 100 dip and width will be match parent

User · Answer

Use FractionallySizedBox widget  FractionallySizedBox    widthFactor  1 0     width w r t to parent   heightFactor  1 0      height w r t to parent   child   Your Child Here     This widget is also very useful when you want to size your child at a fractional of its parent s size   Example  If you want the child to occupy 50  width of its parent  provide widthFactor as 0 5

User · Answer

To make a child fill its parent  simply wrap it into a FittedBox     FittedBox       child  Image asset  foo png         fit  BoxFit fill

User · Answer

In order to get behavior for match parent and wrap content we need to   use mainAxisSize property in Row Column widget  the mainAxisSize   property takes MainAxisSize enum having two values which is   MainAxisSize min which behaves as wrap content and MainAxisSize max   which behaves as match parent      Link of the original Article

User · Answer

Use this line of codes inside the Column  For wrap content   mainAxisSize  MainAxisSize min For match parent   mainAxisSize  MainAxisSize max

User · Answer

The short answer is that the parent doesn t have a size until the child has a size   The way layout works in Flutter is that each widget provides constraints to each of its children  like  you can be up to this wide  you must be this tall  you have to be at least this wide   or whatever  specifically  they get a minimum width  a maximum width  a minimum height  and a maximum height   Each child takes those constraints  does something  and picks a size  width and height  that matches those constraints  Then  once each child has done its thing  the widget can can pick its own size   Some widgets try to be as big as the parent allows  Some widgets try to be as small as the parent allows  Some widgets try to match a certain  natural  size  e g  text  images    Some widgets tell their children they can be any size they want  Some give their children the same constraints that they got from their parent

User · Answer

Stack    children        Container color Colors red  height 200 0  width 200 0       Positioned fill        child  Container color  Colors  yellow

[flutter] The equivalent of wrap_content and match_parent in flutter?

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