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-rw-r--r--browser/components/migration/MigrationWizardChild.sys.mjs57
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diff --git a/browser/components/migration/MigrationWizardChild.sys.mjs b/browser/components/migration/MigrationWizardChild.sys.mjs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import { MigrationWizardConstants } from "chrome://browser/content/migration/migration-wizard-constants.mjs";
+
+/**
+ * This class is responsible for updating the state of a <migration-wizard>
+ * component, and for listening for events from that component to perform
+ * various migration functions.
+ */
+export class MigrationWizardChild extends JSWindowActorChild {
+ #wizardEl = null;
+
+ /**
+ * General event handler function for events dispatched from the
+ * <migration-wizard> component.
+ *
+ * @param {Event} event
+ * The DOM event being handled.
+ * @returns {Promise}
+ */
+ async handleEvent(event) {
+ if (event.type == "MigrationWizard:Init") {
+ this.#wizardEl = event.target;
+ let migrators = await this.sendQuery("GetAvailableMigrators");
+ this.setComponentState({
+ migrators,
+ page: MigrationWizardConstants.PAGES.SELECTION,
+ });
+ }
+ }
+
+ /**
+ * Calls the `setState` method on the <migration-wizard> component. The
+ * state is cloned into the execution scope of this.#wizardEl.
+ *
+ * @param {object} state The state object that a <migration-wizard>
+ * component expects. See the documentation for the element's setState
+ * method for more details.
+ */
+ setComponentState(state) {
+ if (!this.#wizardEl) {
+ return;
+ }
+ // We waive XrayWrappers in the event that the element is embedded in
+ // a document without system privileges, like about:welcome.
+ Cu.waiveXrays(this.#wizardEl).setState(
+ Cu.cloneInto(
+ state,
+ // ownerGlobal doesn't exist in content windows.
+ // eslint-disable-next-line mozilla/use-ownerGlobal
+ this.#wizardEl.ownerDocument.defaultView
+ )
+ );
+ }
+}