andrew
2f59d3c115
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.
108 lines
3.7 KiB
Markdown
108 lines
3.7 KiB
Markdown
# Compositor
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Sway is the **temporary** Wayland compositor while Nebula Desktop is developed. Configuration lives in `sway/nebula-sway.conf`.
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Sway currently provides:
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- Wayland compositor
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- floating-first application window management
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- temporary title bars and borders on normal application windows
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- XWayland
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- input and the pointer cursor
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- output handling
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Nebula provides the visible shell (Qt Quick/QML via LayerShellQt) and logical window management through `WindowService` (`core/windows`). The Sway config must not enable a Sway bar.
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A custom Nebula compositor is a later milestone. Do not treat this Sway setup as the final architecture. QML must not call `swaymsg`; the Sway IPC backend is the only Sway-specific code, and it is isolated so it can be replaced.
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```text
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Ubuntu/Linux
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↓
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Wayland
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↓
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Sway now
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Nebula compositor later
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↓
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Nebula Shell
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Qt Quick/QML
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```
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## Floating-first session
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Ordinary application windows open as floating windows, sized to about **70% of the current workspace** (the usable output area below the 40px Nebula top bar) and centred. Sway workspace geometry already excludes the top-bar exclusive zone, so placement stays on-screen at any resolution.
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Rules match only normal application views:
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- Wayland: `shell="xdg_shell"` (`app_id`)
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- XWayland: `shell="xwayland"` (`class`)
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Layer-shell surfaces (Nebula desktop, top bar, launcher, overlays) are a different shell and are not matched. They stay on BACKGROUND / TOP / OVERLAY.
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Sway draws a restrained title bar and border on those application windows so they can be identified, dragged, and resized with the mouse. This is **temporary**. Custom Nebula decorations, CSD, and wrapping Wayland clients inside QML are out of scope.
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## Development session
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From the NebulaOS repository root:
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```bash
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sway -c compositor/sway/nebula-sway.conf
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```
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Recommended on the Ubuntu VMware VM (repo-root `cd`, cursor environment, software cursors):
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```bash
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sh compositor/sway/dev/run-sway-vm.sh
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```
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Sway then autostarts Nebula Desktop through `scripts/run-nebula-vm.sh`.
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Skip shell autostart:
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```bash
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NEBULA_SHELL_AUTOSTART=0 sh compositor/sway/dev/run-sway-vm.sh
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```
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### Output / resolution
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The development config uses scale `1` and does not pin a resolution. Sway uses the output's preferred mode, which follows the current display size (including VMware Autofit Guest). Window sizes use workspace-relative percentages, not hard-coded pixel dimensions.
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```bash
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swaymsg -t get_outputs
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swaymsg output <name> scale 1
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```
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### Cursor
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```text
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seat * xcursor_theme Adwaita 24
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XCURSOR_THEME=Adwaita
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XCURSOR_SIZE=24
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```
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Requires `adwaita-icon-theme`. A Nebula-branded cursor theme is a later task.
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`WLR_NO_HARDWARE_CURSORS=1` is VMware-specific and is set by `run-sway-vm.sh`, not by production session files.
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### Emergency / development shortcuts
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Normal launching, focusing, and closing is done from the Nebula GUI. These remain compositor fallbacks:
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| Shortcut | Action |
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|----------|--------|
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| Super+Enter | open Foot |
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| Super+Left Mouse | move the floating window under the pointer |
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| Super+Right Mouse | resize the floating window under the pointer |
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| Super+Left | snap to left half of the usable area |
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| Super+Right | snap to right half of the usable area |
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| Super+Up | maximise to the usable area (below the top bar) |
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| Super+Down | restore to the default ~70% centred size |
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| Super+Shift+Q | close the focused window |
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| Super+Shift+E | exit Sway |
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| Super+Shift+C | reload Sway config |
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Title-bar drag and border resize should be the normal mouse path. Super+mouse is an emergency convenience.
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### Rendering
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`scripts/run-nebula-vm.sh` sets `QT_QUICK_BACKEND=software` for the VMware guest GPU. Production `nebula-shell` must not set that variable.
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