Add desktop widgets and streamline documentation
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# Ferese Shell Design Specification
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Status: Draft for implementation
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Target: Ferese desktop tier
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Normative owner: shell behavior and interaction
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Companion documents:
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- `ferese-window-manager-spec.md` — compositor mechanism and policy
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- `ferese-theme-ui-spec.md` — visual tokens and exact component geometry
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## 1. Purpose
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`ferese-shell` provides the integrated desktop interface around Ferese-managed
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windows.
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The initial shell consists of:
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- one floating top bar per output;
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- an apps-only launcher;
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- overview controls;
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- top-bar popovers and a compact control center;
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- notifications and notification history; and
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- volume/brightness OSD.
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Ferese deliberately provides no persistent dock or bottom application bar.
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The shell MUST remain optional. If it crashes, managed windows, layout trees,
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workspaces, focus topology, and client sessions remain valid.
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## 2. Document boundaries
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This document owns:
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```text
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shell visibility
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layer-shell roles
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exclusive-zone behavior
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focus acquisition/restoration
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launcher behavior
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top-bar actions
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notification/DND behavior
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modal interaction
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fullscreen shell behavior
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shell restart behavior
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```
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It MUST NOT define raw colors, pixel heights, radii, blur amounts, icon sizes,
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font sizes, or shadows. Those belong to `ferese-theme-ui-spec.md`.
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## 3. Surface architecture
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The shell uses public layer-shell for normal shell surfaces.
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```text
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background(output) background layer, optional
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top_bar(output) top layer, exclusive zone
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launcher(output) overlay layer, exclusive_zone = 0
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notification_stack(output) overlay layer, exclusive_zone = 0
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osd(output) overlay layer, exclusive_zone = 0
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popover(output) overlay/top, exclusive_zone = 0
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modal(output) overlay layer, exclusive_zone = 0
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```
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`ferese-shell-v1` is a private control protocol only. It MUST NOT duplicate
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layer-shell geometry or roles.
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Its initial responsibilities are:
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```text
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window list and lifecycle
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application identity metadata
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focused / urgent state
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activate managed window
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request close
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enter / exit overview
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select overview window / workspace
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```
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## 4. Top bar
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A top bar exists on every active output unless disabled.
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Its conceptual regions are:
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```text
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LEFT
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Ferese mark
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workspace switcher
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focused application
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CENTER
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clock / date
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RIGHT
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notifications
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sound
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power
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control-center entry
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```
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The top bar is the only persistent shell surface that reserves workspace space.
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Workspace controls MUST use compositor workspace truth and ordinary Ferese
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workspace policy.
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The top bar SHOULD remain non-keyboard-interactive during ordinary use.
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## 5. Fullscreen behavior
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Entering fullscreen hides the top bar visually.
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The underlying tiled workspace layout region MUST remain unchanged while
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fullscreen is active.
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A temporary top-bar reveal over fullscreen:
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```text
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uses overlay presentation
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uses exclusive_zone = 0
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does not resize the fullscreen client
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does not mutate the underlying workspace layout
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```
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Leaving fullscreen restores the ordinary top-bar presentation without
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reconfiguring hidden tiled windows merely because the bar reappears.
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## 6. Shell reservation lease
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If `ferese-shell` disconnects unexpectedly, Ferese SHOULD retain the most recent
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valid Ferese-owned top-bar reservation for a short bounded grace period.
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If the shell reconnects before expiry with a compatible reservation, tiled
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windows MUST NOT reflow.
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If the grace period expires, Ferese removes the reservation and performs at most
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one ordinary layout reflow.
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Default:
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```text
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reservation_grace_ms = 2000
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```
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## 7. Launcher
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The initial launcher is apps-only.
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Default invocation:
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```text
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Super + Space
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```
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The launcher MAY also be opened by a Ferese control in the top bar.
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The launcher:
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- receives keyboard focus immediately;
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- discovers XDG desktop applications;
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- searches by application name and normalized desktop identity;
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- supports pointer and keyboard navigation;
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- launches selected applications with XDG activation;
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- dismisses on Escape; and
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- restores the previous valid managed-window focus on dismissal.
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Initial placeholder:
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```text
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Search apps…
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```
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The launcher MUST NOT expose dead tabs for files, settings, commands, or recents.
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Future search providers MAY extend it without changing the base interaction
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model.
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## 8. Application identity and launch state
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The launcher consumes the compositor's normalized application identity and launch
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association model.
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It MUST NOT assume strings such as:
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```text
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firefox
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org.mozilla.firefox
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Mozilla Firefox
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```
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are the same application unless desktop-entry or activation metadata establishes
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that relationship.
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Ferese does not maintain a persistent running-application strip.
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## 9. Top-bar popovers
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A top-bar control may own one anchored popover.
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Only one primary top-bar popover SHOULD be open per output at a time.
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Initial popovers MAY include:
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```text
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calendar / time
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sound
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battery / power status
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notifications
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control center
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```
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Network and Bluetooth configuration are not part of the initial desktop tier and
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MUST NOT appear as required or placeholder rows.
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Opening another primary popover closes the previous one on that output.
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## 10. Control center
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The initial control center MAY expose only services backed by real providers:
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```text
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sound
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battery / power status
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Do Not Disturb
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notification state
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Ferese Settings
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```
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Unavailable capabilities are omitted.
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## 11. Do Not Disturb
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When DND is off:
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```text
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eligible notifications may create transient toasts
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notifications enter history according to normal policy
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```
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When DND is on:
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```text
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normal transient toasts are suppressed
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notifications still enter history
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unread state still updates
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```
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A future explicitly defined critical-urgency policy MAY bypass DND.
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No application-name heuristic may bypass DND.
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DND state persists across shell restart.
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## 12. Notifications
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`ferese-shell` implements `org.freedesktop.Notifications`.
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Initial support:
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```text
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summary
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body
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icon metadata
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expiry
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replacement
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close
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actions
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urgency metadata
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```
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Notification content is untrusted.
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Transient toasts:
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- do not reserve workspace space;
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- appear beneath the top bar;
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- obey DND;
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- do not take keyboard focus by default.
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## 13. Notification center
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Notification history opens from the top bar.
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The initial implementation SHOULD use a large anchored popover rather than a
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permanent side drawer.
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The center may take shell keyboard focus while interactive and MUST restore the
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previous managed-window focus when dismissed.
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## 14. OSD
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OSD handles transient state such as:
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```text
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volume
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brightness
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microphone mute
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keyboard backlight
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```
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OSD surfaces:
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```text
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use overlay layer
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use exclusive_zone = 0
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never take keyboard focus
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dismiss automatically
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```
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## 15. Overview
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`Super+Tab` enters overview.
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Managed-window previews remain compositor-owned live scene nodes.
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The shell provides:
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```text
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selection affordances
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application/window labels
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workspace controls
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optional later search UI
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```
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The shell MUST NOT implement overview by continuously copying each managed
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window into the shell process.
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Window activation and close actions use `ferese-shell-v1`.
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## 16. Modal interaction
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Shell modals are reserved for:
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```text
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destructive confirmation
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security-sensitive confirmation
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irreversible shell action
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```
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Ordinary settings MUST NOT use shell modals.
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When a shell modal opens:
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```text
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SeatState.keyboard_focus -> FocusTarget::Shell(modal)
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```
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The compositor presents the modal above a scrim.
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Input outside the modal is consumed by the scrim and MUST NOT reach managed
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applications.
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On dismissal, the previous valid managed-window focus is restored.
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Ferese does not ship a polkit authentication agent in the initial desktop tier.
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## 17. Shell restart
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On restart:
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```text
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managed windows remain unchanged
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workspace assignments remain unchanged
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layout trees remain unchanged
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managed-window focus remains valid where possible
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```
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The restarted shell reconstructs:
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```text
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top bars
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workspace indicators
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focused-app metadata
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notification service/state
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DND state
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```
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from compositor truth and persistent shell state.
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## 18. Shell configuration
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Representative behavior-only configuration:
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```toml
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[shell]
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enabled = true
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reservation_grace_ms = 2000
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[shell.top_bar]
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enabled = true
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hide_in_fullscreen = true
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show_workspaces = true
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show_focused_app = true
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show_clock = true
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[shell.launcher]
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enabled = true
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binding = "Super+Space"
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[shell.overview]
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enabled = true
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binding = "Super+Tab"
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[shell.notifications]
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enabled = true
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do_not_disturb = false
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```
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Visual measurements do not belong here.
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## 19. First shell implementation slice
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```text
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top bar
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launcher
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one top-bar popover
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OSD
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```
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Demo:
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```text
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1. Start Ferese.
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2. Top bar appears.
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3. Workspace and focused-app state are correct.
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4. Press Super+Space.
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5. Launcher opens and receives focus.
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6. Search for Foot and launch it.
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7. Foot enters the current workspace through normal tiling policy.
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8. Open Sound from the top bar.
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9. Sound popover anchors to its invoking control.
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10. Enter fullscreen.
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11. Top bar hides without changing the underlying tiled layout region.
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12. Reveal top bar temporarily as an overlay.
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13. Exit fullscreen.
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14. Top bar returns to normal reserved presentation.
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15. Restart ferese-shell.
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16. Tiled windows do not reflow during the reservation grace period.
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```
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## 20. Completion criteria
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The initial shell is complete when:
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1. every active output has a functional top bar;
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2. launcher search and application launching work;
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3. workspace indicators reflect compositor truth;
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4. focused application state is accurate;
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5. top-bar popovers anchor correctly;
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6. notifications and DND work;
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7. OSD works without taking focus;
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8. overview uses compositor-owned live windows;
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9. fullscreen hide/reveal does not alter underlying layout geometry;
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10. shell restart does not disturb managed windows; and
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11. all visual presentation is supplied through the theme/UI token system.
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