feat: give the classroom a desktop instead of a shell
The whole appliance UI is now configuration for a desktop Debian already ships: a Plasma 6.3 session with a colour scheme, a look and feel package that builds the bar, window rules, and KDE's own Kiosk restrictions. Two things were measured rather than assumed, and both changed a decision. Plasma restarts a crashed panel three times a minute and then gives up, which is the failure a classroom has already had. Four lines of systemd drop-in make it unconditional; the panel then survived eight SIGKILLs a second apart, back each time in 2.4s. Plasma draws a minimised task and a background task identically, so the five states the room needs cannot all be shown. Rather than write a task manager, the classroom removes minimise: clicking a launcher always means show me this. Co-Authored-By: Claude Opus 5 <[email protected]>
This commit is contained in:
ekklesia
co-authored by
Claude Opus 5
Claude Opus 5
parent
bfc7caf28f
commit
87b55761c6
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// The Ekklesia Classroom desktop.
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//
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// Plasma runs this once, when a session has no panel yet, and again on
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// demand — `plasma-apply-lookandfeel -a org.ekklesia.classroom.desktop
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// --resetLayout` rebuilds the whole desktop from this file. That is the
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// classroom's recovery path for a damaged shell, and it is Plasma's own
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// mechanism rather than something written here.
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//
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// One full-width bar along the bottom. Left is auxiliary, the middle is
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// applications, the right is the small amount of status a teacher needs.
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// Nothing else is on the screen.
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var WALLPAPER = "/usr/share/backgrounds/ekklesia/classroom-calm.png";
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// Matches the 76px strip the classroom has always used, so muscle memory
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// and the room's viewing distance both carry over.
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var PANEL_HEIGHT = 76;
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// The idle desktop: the wallpaper, and nothing on it.
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var screens = desktops();
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for (var i = 0; i < screens.length; i++) {
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var desktop = screens[i];
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desktop.wallpaperPlugin = "org.kde.image";
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desktop.currentConfigGroup = ["Wallpaper", "org.kde.image", "General"];
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desktop.writeConfig("Image", "file://" + WALLPAPER);
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desktop.writeConfig("SlidePaths", "");
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// 2 is "scaled and cropped": the landscape fills the display at any
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// aspect ratio without being stretched out of shape.
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desktop.writeConfig("FillMode", 2);
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desktop.reloadConfig();
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}
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var panel = new Panel();
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panel.location = "bottom";
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panel.height = PANEL_HEIGHT;
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panel.hiding = "none";
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panel.floating = false;
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panel.lengthMode = "fill";
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panel.alignment = "center";
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panel.opacity = "adaptive";
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// LEFT — auxiliary. Parent Call is not one of the room's applications and
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// is deliberately not in the row with them.
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var parentCall = panel.addWidget("org.kde.plasma.icon");
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parentCall.currentConfigGroup = ["General"];
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parentCall.writeConfig(
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"url",
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"file:///usr/share/applications/ekklesia-parent-call.desktop"
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);
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var leftGap = panel.addWidget("org.kde.plasma.panelspacer");
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leftGap.currentConfigGroup = ["General"];
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leftGap.writeConfig("expanding", true);
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// CENTRE — the applications, and the whole of the running/minimised/active
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// story. This applet is the reason the classroom stops writing a dock.
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var tasks = panel.addWidget("org.kde.plasma.icontasks");
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tasks.currentConfigGroup = ["General"];
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tasks.writeConfig("launchers", [
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"applications:ekklesia-wonderink.desktop",
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"applications:google-chrome.desktop"
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].join(","));
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// Every window gets its own button. Teachers should never have to open a
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// group to find out that a second window exists.
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tasks.writeConfig("groupingStrategy", 0);
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tasks.writeConfig("showOnlyCurrentDesktop", false);
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tasks.writeConfig("showOnlyCurrentActivity", false);
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tasks.writeConfig("showOnlyCurrentScreen", false);
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// Clicking a button always means "show me this", and never "hide it".
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//
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// This was measured before it was decided. Plasma 6.3 draws a minimised
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// task and a task that is merely behind another window identically: no
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// indicator for closed, a grey indicator for running, a teal one for
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// active — three marks for four states. Rather than write a task manager
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// that draws a fourth, the classroom removes the state. There is nothing
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// on the idle desktop for a teacher to want to see, so minimising an
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// application in this room has no purpose and only ever loses it.
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//
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// A window minimised some other way is still shown as running and comes
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// back with one click, so it can never be lost even then.
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tasks.writeConfig("minimizeActiveTaskOnClick", false);
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tasks.writeConfig("fill", false);
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tasks.writeConfig("maxStripes", 1);
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tasks.writeConfig("indicateAudioStreams", false);
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tasks.writeConfig("wheelEnabled", false);
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tasks.writeConfig("middleClickAction", "NewInstance");
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tasks.writeConfig("showToolTips", true);
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tasks.writeConfig("iconSpacing", 2);
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var rightGap = panel.addWidget("org.kde.plasma.panelspacer");
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rightGap.currentConfigGroup = ["General"];
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rightGap.writeConfig("expanding", true);
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// RIGHT — status.
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//
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// Four ordinary applets straight on the bar, and no system tray around
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// them. A tray is a container that discovers whatever is installed and
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// then hides most of it behind an arrow; measured in the lab it collected
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// battery, brightness, clipboard, keyboard layout, camera, vaults and
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// screen management on a machine that has none of those to say anything
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// about. Naming the four the classroom actually uses is both smaller and
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// deterministic, and it leaves nothing for a teacher to expand.
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panel.addWidget("org.kde.plasma.networkmanagement");
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panel.addWidget("org.kde.plasma.volume");
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// Present only while there is something in a drive. Plasma's own Solid
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// device notifier is what makes the DVD appear with the disc and leave
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// with it, so nothing in the classroom polls for media.
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panel.addWidget("org.kde.plasma.devicenotifier");
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panel.addWidget("org.kde.plasma.notifications");
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var clock = panel.addWidget("org.kde.plasma.digitalclock");
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clock.currentConfigGroup = ["Appearance"];
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clock.writeConfig("showDate", true);
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clock.writeConfig("dateFormat", "custom");
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clock.writeConfig("customDateFormat", "ddd d MMM");
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clock.writeConfig("showSeconds", 0);
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clock.writeConfig("dateDisplayFormat", "BelowTime");
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// Left to itself the clock grows to the height of the bar and becomes the
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// largest text in the room. It is status, not a headline.
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clock.writeConfig("autoFontAndSize", false);
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clock.writeConfig("fontSize", 15);
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clock.writeConfig("fontWeight", 500);
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