Adding upstream version 48.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

js/ui/components.js

@@ -0,0 +1,60 @@
+import * as Main from './main.js';
+
+export class ComponentManager {
+    constructor() {
+        this._allComponents = {};
+        this._enabledComponents = [];
+
+        Main.sessionMode.connect('updated', () => {
+            this._sessionModeUpdated().catch(logError);
+        });
+
+        this._sessionModeUpdated().catch(logError);
+    }
+
+    async _sessionModeUpdated() {
+        let newEnabledComponents = Main.sessionMode.components;
+
+        await Promise.allSettled([...newEnabledComponents
+            .filter(name => !this._enabledComponents.includes(name))
+            .map(name => this._enableComponent(name))]);
+
+        this._enabledComponents
+            .filter(name => !newEnabledComponents.includes(name))
+            .forEach(name => this._disableComponent(name));
+
+        this._enabledComponents = newEnabledComponents;
+    }
+
+    async _importComponent(name) {
+        let module = await import(`./components/${name}.js`);
+        return module.Component;
+    }
+
+    async _ensureComponent(name) {
+        let component = this._allComponents[name];
+        if (component)
+            return component;
+
+        if (Main.sessionMode.isLocked)
+            return null;
+
+        let constructor = await this._importComponent(name);
+        component = new constructor();
+        this._allComponents[name] = component;
+        return component;
+    }
+
+    async _enableComponent(name) {
+        let component = await this._ensureComponent(name);
+        if (component)
+            component.enable();
+    }
+
+    _disableComponent(name) {
+        let component = this._allComponents[name];
+        if (component == null)
+            return;
+        component.disable();
+    }
+}