viewportStableHeight property

  1. @override
double? get viewportStableHeight
override

The height of the visible area of the Mini App in its last stable state. Also available in CSS as a variable var(--tg- viewport-stable-height).

The application can display just the top part of the Mini App, with its lower part remaining outside the screen area. From this position, the user can “pull” the Mini App to its maximum height, while the bot can do the same by calling the expand() method. Unlike the value of viewportHeight, the value of viewportStableHeight does not change as the position of the Mini App changes with user gestures or during animations. The value of viewportStableHeight will be updated after all gestures and animations are completed and the Mini App reaches its final size.

Note the event viewportChanged with the passed parameter isStateStable=true, which will allow you to track when the stable state of the height of the visible area changes.

Implementation

@override
double? get viewportStableHeight => 548.0;