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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/. */
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
TranslationsParent: "resource://gre/actors/TranslationsParent.sys.mjs",
EngineProcess: "chrome://global/content/ml/EngineProcess.sys.mjs",
});
/**
* This parent is blank because the Translations actor handles most of the features
* needed in AboutTranslations.
*/
export class AboutTranslationsParent extends JSWindowActorParent {
#isDestroyed = false;
didDestroy() {
this.#isDestroyed = true;
}
async receiveMessage({ name, data }) {
switch (name) {
case "AboutTranslations:GetTranslationsPort": {
const { fromLanguage, toLanguage } = data;
const translationsEngineParent =
await lazy.EngineProcess.getTranslationsEngineParent();
if (this.#isDestroyed) {
return undefined;
}
const { port1, port2 } = new MessageChannel();
translationsEngineParent.startTranslation(
fromLanguage,
toLanguage,
port1,
this.browsingContext.top.embedderElement.innerWindowID
);
// At the time of writing, you can't return a port via the `sendQuery` API,
// so results can't just be returned. The `sendAsyncMessage` method must be
// invoked. Additionally, in the AboutTranslationsChild, the port must
// be transfered to the content page with `postMessage`.
this.sendAsyncMessage(
"AboutTranslations:SendTranslationsPort",
{
fromLanguage,
toLanguage,
port: port2,
},
[port2] // Mark the port as transerable.
);
return undefined;
}
case "AboutTranslations:GetSupportedLanguages": {
return lazy.TranslationsParent.getSupportedLanguages();
}
case "AboutTranslations:IsTranslationsEngineSupported": {
return lazy.TranslationsParent.getIsTranslationsEngineSupported();
}
default:
throw new Error("Unknown AboutTranslations message: " + name);
}
}
}
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