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andrew 2f59d3c115 Add Nebula.Windows with Sway IPC backend

Introduces a new `core/windows` module (`Nebula.Windows`) with `WindowService`, window/workspace models, and a Sway IPC backend for live window tracking and control (focus, close, move/resize, snap, maximize/restore, minimize, workspace switch). The desktop shell now links this module, uses compositor focus for top-bar active app text, and adds an Open Windows section in the launcher with focus/close actions.

Also updates application metadata handling to parse `StartupWMClass` and map window `app_id`/class to friendly names and icons, and revises Sway config/docs for the new floating-first Desktop 0.2 behavior with temporary compositor-provided decorations.

2026-08-26 18:20:56 +12:00

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Nebula Windows

Shared C++ window-management service. Desktop, the future Bigscreen shell, and a future Nebula compositor backend should all talk to this library rather than to a compositor directly.

Nebula QML
    ↓
WindowService
    ↓
generic WindowBackend
    ↓
Sway IPC          now
Nebula compositor later

QML must not run swaymsg. Sway-specific protocol, socket handling, and tree parsing stay in backends/sway/.

Behaviour

Connects to the compositor IPC socket from SWAYSOCK. The path is never hard-coded.
If IPC is missing or fails, the shell keeps running and WindowService stays empty. A development warning is logged.
Subscribes to window, workspace, and output events instead of polling.
Exposes WindowModel (QAbstractListModel) and WorkspaceModel.
Tracks the focused normal application window. Layer-shell chrome (desktop, top bar, launcher) is not treated as the active app.
Resolves a user-facing name via ApplicationService when possible, then a small identifier humanizer (footclient → Foot, org.mozilla.firefox → Firefox).

QML module URI: Nebula.Windows.

Operations

focusWindow, closeWindow, maximizeWindow, restoreWindow, setWindowFloating, plus moveWindow / resizeWindow / snapWindow / switchWorkspace.

closeWindow asks the compositor to close the client. It does not kill the process.

Maximise fills the current workspace usable area (below the Nebula exclusive zone) using compositor-relative sizing. Restore returns the previous floating geometry when WindowService saved it.

Minimise is implemented for the Sway backend using scratchpad semantics, but the UI must not mention scratchpad. The user-facing idea is only hide / show.

Snap edges (SnapLeft, SnapRight, SnapMaximize) are prepared for a later Snap Layouts UI.

See shells/desktop/README.md and compositor/README.md for session behaviour.

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Nebula Windows

Behaviour

Operations

1.9 KiB

Raw Blame History