Combines multiple concepts from the material design specification, namely:
It is responsive and changes view to apply to the material design guidelines.
The currently visible part: either the left sheet, right sheet or the search bar
The initial state of the layout
Update the model, put this function into your subscription. The first argument is the seconds that have passed sice the function was called last.
View the layout. Replacement of Element.layout.
Queues a message and displayes it as a snackbar once no other snackbar is visible.
The model of the layout containing the snackbar and the currently active side sheet (or search bar)