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https://github.com/zen-browser/pdf.js.git
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f0aa08b464
This replaces our *custom* overlays with standard `<dialog>` DOM elements, see https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dialog, thus simplifying the related CSS, HTML, and JavaScript code. With these changes, some of the functionality of the `OverlayManager` class is now handled natively (e.g. `Esc` to close the dialog). However, since we still need to be able to prevent dialogs from overlaying one another, it still makes sense to keep this functionality (as far as I'm concerned).
99 lines
3.2 KiB
JavaScript
99 lines
3.2 KiB
JavaScript
/* Copyright 2014 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 OverlayManager {
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#overlays = Object.create(null);
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#active = null;
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get active() {
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return this.#active;
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}
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/**
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* @param {string} name - The name of the overlay that is registered.
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* @param {HTMLDialogElement} dialog - The overlay's DOM element.
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* @param {boolean} [canForceClose] - Indicates if opening the overlay closes
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* an active overlay. The default is `false`.
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* @returns {Promise} A promise that is resolved when the overlay has been
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* registered.
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*/
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async register(name, dialog, canForceClose = false) {
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if (!name || !dialog) {
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throw new Error("Not enough parameters.");
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} else if (this.#overlays[name]) {
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throw new Error("The overlay is already registered.");
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}
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this.#overlays[name] = { dialog, canForceClose };
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dialog.addEventListener("cancel", evt => {
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this.#active = null;
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});
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}
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/**
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* @param {string} name - The name of the overlay that is unregistered.
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* @returns {Promise} A promise that is resolved when the overlay has been
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* unregistered.
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*/
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async unregister(name) {
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if (!this.#overlays[name]) {
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throw new Error("The overlay does not exist.");
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} else if (this.#active === name) {
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throw new Error("The overlay cannot be removed while it is active.");
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}
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delete this.#overlays[name];
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}
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/**
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* @param {string} name - The name of the overlay that should be opened.
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* @returns {Promise} A promise that is resolved when the overlay has been
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* opened.
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*/
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async open(name) {
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if (!this.#overlays[name]) {
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throw new Error("The overlay does not exist.");
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} else if (this.#active) {
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if (this.#active === name) {
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throw new Error("The overlay is already active.");
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} else if (this.#overlays[name].canForceClose) {
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await this.close();
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} else {
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throw new Error("Another overlay is currently active.");
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}
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}
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this.#active = name;
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this.#overlays[this.#active].dialog.showModal();
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}
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/**
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* @param {string} name - The name of the overlay that should be closed.
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* @returns {Promise} A promise that is resolved when the overlay has been
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* closed.
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*/
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async close(name = this.#active) {
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if (!this.#overlays[name]) {
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throw new Error("The overlay does not exist.");
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} else if (!this.#active) {
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throw new Error("The overlay is currently not active.");
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} else if (this.#active !== name) {
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throw new Error("Another overlay is currently active.");
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}
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this.#overlays[this.#active].dialog.close();
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this.#active = null;
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}
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}
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export { OverlayManager };
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