Module rs::panel

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Panel state management.

This is effectively a mirror of the previous C code, with an explicit state machine managing the panel size.

It still relies on a callback from Wayland to accept the panel size, which makes this code somewhat prone to mistakes.

An alternative to the callback would be to send a message all the way to state::State every time the allocated size changes. That would allow for a more holistic view of interactions of different pieces of state.

However, state::State already has the potential to become a ball of mud, tightly coupling different functionality and making it difficult to see independent units.

For this reason, I’m taking a light touch approach with the panel manager, and moving it just a bit closer to state::State. Hopefully ths still allows us to expose assumptions that were not stated yet (e.g. can the output disappear between size request andallocation?).

Tight coupling, e.g. a future one between presented hints and layout size, will have to be taken into account later.

Modules§

Structs§

  • Tries to contain all the panel sizing duties.
  • Size in pixels that is aware of scaling
  • Size 🔒

Enums§

  • State 🔒
    This state requests the Wayland layer shell protocol synchronization: the application asks for some size, and then receives a size that the compositor thought appropriate. Stores raw values passed to Wayland, i.e. scaled dimensions.
  • Update 🔒
    A command to send out to the next layer of processing. Here, it’s the C side of the panel.

Functions§