Expanded
and Flexible
are two widgets in Flutter that are used to control the layout and size of widgets within a parent widget.
Expanded
is used when you want to occupy a portion of the remaining space in a parent widget. For example, if you have a Row
widget with several children, and you want one of the children to take up all of the remaining space, you would wrap that child in an Expanded
widget. When using Expanded
, you can specify the flex
parameter to control the proportion of the remaining space that the Expanded
widget should take up. For example, if you have two Expanded
widgets with flex
values of 1 and 2 respectively, the second Expanded
widget will take up twice as much of the remaining space as the first.
Flexible
is similar to Expanded
, but it also allows you to specify a maximum and minimum size for the widget. For example, you could use Flexible
to wrap a widget that should take up a portion of the remaining space, but should never be smaller than a certain size, or larger than a certain size.
In general, Expanded
is the simpler of the two widgets to use, but Flexible
is more versatile. If you just need to occupy a portion of the remaining space and don’t have specific size constraints, use Expanded
. If you have more specific size constraints, use Flexible
.