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Implement the new alt text flow (bug 1909604)
For the Firefox pdf viewer, we want to use AI to guess an alt-text when adding an image to a pdf. For now the telemtry stuff is not implemented and will come soon. In order to test it locally: - set enableAltText, enableFakeMLManager and enableUpdatedAddImage to true. or in Firefox: - set browser.ml.enable, pdfjs.enableAltText and pdfjs.enableUpdatedAddImage to true.
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Calixte Denizet
parent
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commit
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22 changed files with 1366 additions and 91 deletions
399
web/new_alt_text_manager.js
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399
web/new_alt_text_manager.js
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/* Copyright 2024 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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class NewAltTextManager {
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#boundCancel = this.#cancel.bind(this);
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#createAutomaticallyButton;
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#currentEditor = null;
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#cancelButton;
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#descriptionContainer;
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#dialog;
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#disclaimer;
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#firstTime = false;
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#guessedAltText;
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#isEditing = null;
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#imagePreview;
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#imageData;
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#isAILoading = false;
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#wasAILoading = false;
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#learnMore;
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#notNowButton;
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#overlayManager;
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#textarea;
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#title;
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#uiManager;
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#previousAltText = null;
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#telemetryData = null;
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constructor(
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{
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descriptionContainer,
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dialog,
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imagePreview,
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cancelButton,
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disclaimer,
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notNowButton,
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saveButton,
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textarea,
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learnMore,
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errorCloseButton,
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createAutomaticallyButton,
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title,
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},
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overlayManager
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) {
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this.#cancelButton = cancelButton;
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this.#createAutomaticallyButton = createAutomaticallyButton;
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this.#descriptionContainer = descriptionContainer;
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this.#dialog = dialog;
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this.#disclaimer = disclaimer;
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this.#notNowButton = notNowButton;
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this.#imagePreview = imagePreview;
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this.#textarea = textarea;
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this.#learnMore = learnMore;
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this.#title = title;
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this.#overlayManager = overlayManager;
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dialog.addEventListener("close", this.#close.bind(this));
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dialog.addEventListener("contextmenu", event => {
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if (event.target !== this.#textarea) {
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event.preventDefault();
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}
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});
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cancelButton.addEventListener("click", this.#boundCancel);
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notNowButton.addEventListener("click", this.#boundCancel);
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saveButton.addEventListener("click", this.#save.bind(this));
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errorCloseButton.addEventListener("click", () => {
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this.#toggleError(false);
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});
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createAutomaticallyButton.addEventListener("click", async () => {
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const checked =
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createAutomaticallyButton.getAttribute("aria-pressed") !== "true";
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if (this.#uiManager) {
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this.#uiManager.setPreference("enableGuessAltText", checked);
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await this.#uiManager.mlManager.toggleService("altText", checked);
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}
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this.#toggleGuessAltText(checked, /* isInitial = */ false);
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});
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textarea.addEventListener("focus", () => {
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this.#wasAILoading = this.#isAILoading;
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this.#toggleLoading(false);
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});
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textarea.addEventListener("blur", () => {
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if (textarea.value) {
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return;
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}
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this.#toggleLoading(this.#wasAILoading);
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});
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textarea.addEventListener("input", () => {
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this.#toggleTitle();
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this.#toggleDisclaimer();
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});
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this.#overlayManager.register(dialog);
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}
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#toggleLoading(value) {
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if (!this.#uiManager || this.#isAILoading === value) {
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return;
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}
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this.#isAILoading = value;
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this.#descriptionContainer.classList.toggle("loading", value);
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}
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#toggleError(value) {
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if (!this.#uiManager) {
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return;
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}
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this.#dialog.classList.toggle("error", value);
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}
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#toggleTitle() {
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const isEditing = this.#isAILoading || !!this.#textarea.value;
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if (this.#isEditing === isEditing) {
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return;
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}
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this.#isEditing = isEditing;
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this.#title.setAttribute(
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"data-l10n-id",
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`pdfjs-editor-new-alt-text-dialog-${isEditing ? "edit" : "add"}-label`
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);
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}
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async #toggleGuessAltText(value, isInitial = false) {
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if (!this.#uiManager) {
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return;
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}
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this.#dialog.classList.toggle("aiDisabled", !value);
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this.#createAutomaticallyButton.setAttribute("aria-pressed", value);
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if (value) {
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const { altTextLearnMoreUrl } = this.#uiManager.mlManager;
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if (altTextLearnMoreUrl) {
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this.#learnMore.href = altTextLearnMoreUrl;
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}
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this.#mlGuessAltText(isInitial);
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} else {
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this.#toggleLoading(false);
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this.#isAILoading = false;
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this.#toggleTitle();
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this.#toggleDisclaimer();
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}
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}
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#toggleNotNow() {
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this.#notNowButton.classList.toggle("hidden", !this.#firstTime);
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this.#cancelButton.classList.toggle("hidden", this.#firstTime);
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}
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#toggleAI(value) {
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this.#dialog.classList.toggle("noAi", !value);
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this.#toggleTitle();
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}
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#toggleDisclaimer(value = null) {
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if (!this.#uiManager) {
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return;
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}
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const hidden =
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value === null
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? !this.#guessedAltText || this.#guessedAltText !== this.#textarea.value
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: !value;
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this.#disclaimer.classList.toggle("hidden", hidden);
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}
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async #mlGuessAltText(isInitial) {
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if (this.#isAILoading) {
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// We're still loading the previous guess.
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return;
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}
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if (this.#textarea.value) {
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// The user has already set an alt text.
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return;
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}
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if (isInitial && this.#previousAltText !== null) {
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// The user has already set an alt text (empty or not).
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return;
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}
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this.#guessedAltText = this.#currentEditor.guessedAltText;
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if (this.#previousAltText === null && this.#guessedAltText) {
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// We have a guessed alt text and the user didn't change it.
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this.#addAltText(this.#guessedAltText);
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this.#toggleDisclaimer();
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this.#toggleTitle();
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return;
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}
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this.#toggleLoading(true);
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this.#toggleTitle();
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this.#toggleDisclaimer(true);
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let hasError = false;
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try {
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const { width, height, data } = this.#imageData;
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// Take a reference on the current editor, as it can be set to null (if
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// the dialog is closed before the end of the guess).
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// But in case we've an alt-text, we want to set it on the editor.
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const editor = this.#currentEditor;
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// When calling #mlGuessAltText we don't wait for it, so we must take care
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// that the alt text dialog can have been closed before the response is.
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const response = await this.#uiManager.mlGuess({
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service: "moz-image-to-text",
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request: {
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data,
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width,
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height,
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channels: data.length / (width * height),
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},
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});
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if (!response || response.error || !response.output) {
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throw new Error("No valid response from the AI service.");
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}
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const altText = (this.#guessedAltText = response.output);
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await editor.setGuessedAltText(altText);
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this.#wasAILoading = this.#isAILoading;
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if (this.#isAILoading) {
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this.#addAltText(altText);
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}
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} catch (e) {
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console.error(e);
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hasError = true;
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}
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this.#toggleLoading(false);
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if (hasError && this.#uiManager) {
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this.#toggleError(true);
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this.#toggleTitle();
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this.#toggleDisclaimer();
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}
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}
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#addAltText(altText) {
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if (!this.#uiManager || this.#textarea.value) {
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return;
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}
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this.#textarea.value = altText;
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}
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async editAltText(uiManager, editor, firstTime) {
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if (this.#currentEditor || !editor) {
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return;
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}
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if (firstTime && editor.hasAltTextData()) {
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editor.altTextFinish();
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return;
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}
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this.#firstTime = firstTime;
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let { mlManager } = uiManager;
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if (!mlManager?.isReady("altText")) {
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mlManager = null;
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}
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const isAltTextEnabledPromise = mlManager?.isEnabledFor("altText");
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this.#currentEditor = editor;
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this.#uiManager = uiManager;
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this.#uiManager.removeEditListeners();
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({ altText: this.#previousAltText } = editor.altTextData);
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this.#textarea.value = this.#previousAltText ?? "";
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// TODO: get this value from Firefox
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// (https://bugzilla.mozilla.org/show_bug.cgi?id=1908184)
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const AI_MAX_IMAGE_DIMENSION = 224;
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// The max dimension of the preview in the dialog is 180px, so we keep 224px
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// and rescale it thanks to css.
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let canvas;
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if (mlManager) {
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({ canvas, imageData: this.#imageData } = editor.copyCanvas(
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AI_MAX_IMAGE_DIMENSION,
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/* createImageData = */ true
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));
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this.#toggleGuessAltText(
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await isAltTextEnabledPromise,
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/* isInitial = */ true
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);
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} else {
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({ canvas } = editor.copyCanvas(
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AI_MAX_IMAGE_DIMENSION,
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/* createImageData = */ false
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));
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}
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canvas.setAttribute("role", "presentation");
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this.#imagePreview.append(canvas);
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this.#toggleNotNow();
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this.#toggleAI(!!mlManager);
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this.#toggleError(false);
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try {
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await this.#overlayManager.open(this.#dialog);
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} catch (ex) {
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this.#close();
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throw ex;
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}
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}
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#cancel() {
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this.#currentEditor.altTextData = {
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cancel: true,
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};
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this.#finish();
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}
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#finish() {
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if (this.#overlayManager.active === this.#dialog) {
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this.#overlayManager.close(this.#dialog);
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}
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}
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#close() {
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const canvas = this.#imagePreview.firstChild;
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canvas.remove();
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canvas.width = canvas.height = 0;
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this.#imageData = null;
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this.#currentEditor._reportTelemetry(
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this.#telemetryData || {
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action: "alt_text_cancel",
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}
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);
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this.#telemetryData = null;
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this.#toggleLoading(false);
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this.#uiManager?.addEditListeners();
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this.#currentEditor.altTextFinish();
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this.#uiManager?.setSelected(this.#currentEditor);
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this.#currentEditor = null;
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this.#uiManager = null;
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}
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#save() {
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const altText = this.#textarea.value.trim();
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this.#currentEditor.altTextData = {
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altText,
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decorative: false,
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};
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this.#telemetryData = {
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action: "alt_text_save",
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alt_text_description: !!altText,
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alt_text_edit:
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!!this.#previousAltText && this.#previousAltText !== altText,
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alt_text_decorative: false,
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alt_text_altered:
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this.#guessedAltText && this.#guessedAltText !== altText,
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};
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this.#finish();
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}
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destroy() {
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this.#uiManager = null; // Avoid re-adding the edit listeners.
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this.#finish();
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}
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}
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export { NewAltTextManager };
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