The difference can be summarised into:
- I want to be as big as my parent allows (
double.INFINITY
) - I want to be as big as the screen (
MediaQuery
).
Usually, you’ll want to use double.infinity
, but it’s not always possible. Some Widgets allow their children to be as big as they want to be (Column
, ListView
, OverflowBox
…). In that situation using double.infinity
creates a paradox:
- The parent allows any size
- The child wants the biggest size allowed by the parent