2a195beb30
Currently we repeat the same code in lots of places, to update the "toggled" class and "aria-checked" attribute, when various toolbar buttons are clicked. For the MOZCENTRAL build-target this patch reduces the size of the *built* `web/viewer.js` file by just over `1.2` kilo-bytes.
429 lines
13 KiB
JavaScript
429 lines
13 KiB
JavaScript
/* Copyright 2016 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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import {
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PresentationModeState,
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RenderingStates,
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SidebarView,
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toggleCheckedBtn,
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} from "./ui_utils.js";
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const UI_NOTIFICATION_CLASS = "pdfSidebarNotification";
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/**
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* @typedef {Object} PDFSidebarOptions
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* @property {PDFSidebarElements} elements - The DOM elements.
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* @property {PDFViewer} pdfViewer - The document viewer.
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* @property {PDFThumbnailViewer} pdfThumbnailViewer - The thumbnail viewer.
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* @property {EventBus} eventBus - The application event bus.
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* @property {IL10n} l10n - The localization service.
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*/
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/**
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* @typedef {Object} PDFSidebarElements
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* @property {HTMLDivElement} outerContainer - The outer container
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* (encasing both the viewer and sidebar elements).
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* @property {HTMLDivElement} sidebarContainer - The sidebar container
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* (in which the views are placed).
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* @property {HTMLButtonElement} toggleButton - The button used for
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* opening/closing the sidebar.
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* @property {HTMLButtonElement} thumbnailButton - The button used to show
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* the thumbnail view.
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* @property {HTMLButtonElement} outlineButton - The button used to show
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* the outline view.
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* @property {HTMLButtonElement} attachmentsButton - The button used to show
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* the attachments view.
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* @property {HTMLButtonElement} layersButton - The button used to show
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* the layers view.
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* @property {HTMLDivElement} thumbnailView - The container in which
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* the thumbnails are placed.
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* @property {HTMLDivElement} outlineView - The container in which
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* the outline is placed.
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* @property {HTMLDivElement} attachmentsView - The container in which
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* the attachments are placed.
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* @property {HTMLDivElement} layersView - The container in which
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* the layers are placed.
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* @property {HTMLDivElement} outlineOptionsContainer - The container in which
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* the outline view-specific option button(s) are placed.
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* @property {HTMLButtonElement} currentOutlineItemButton - The button used to
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* find the current outline item.
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*/
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class PDFSidebar {
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/**
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* @param {PDFSidebarOptions} options
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*/
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constructor({ elements, pdfViewer, pdfThumbnailViewer, eventBus, l10n }) {
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this.isOpen = false;
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this.active = SidebarView.THUMBS;
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this.isInitialViewSet = false;
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this.isInitialEventDispatched = false;
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/**
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* Callback used when the sidebar has been opened/closed, to ensure that
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* the viewers (PDFViewer/PDFThumbnailViewer) are updated correctly.
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*/
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this.onToggled = null;
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this.pdfViewer = pdfViewer;
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this.pdfThumbnailViewer = pdfThumbnailViewer;
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this.outerContainer = elements.outerContainer;
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this.sidebarContainer = elements.sidebarContainer;
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this.toggleButton = elements.toggleButton;
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this.thumbnailButton = elements.thumbnailButton;
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this.outlineButton = elements.outlineButton;
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this.attachmentsButton = elements.attachmentsButton;
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this.layersButton = elements.layersButton;
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this.thumbnailView = elements.thumbnailView;
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this.outlineView = elements.outlineView;
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this.attachmentsView = elements.attachmentsView;
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this.layersView = elements.layersView;
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this._outlineOptionsContainer = elements.outlineOptionsContainer;
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this._currentOutlineItemButton = elements.currentOutlineItemButton;
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this.eventBus = eventBus;
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this.l10n = l10n;
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this.#addEventListeners();
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}
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reset() {
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this.isInitialViewSet = false;
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this.isInitialEventDispatched = false;
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this.#hideUINotification(/* reset = */ true);
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this.switchView(SidebarView.THUMBS);
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this.outlineButton.disabled = false;
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this.attachmentsButton.disabled = false;
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this.layersButton.disabled = false;
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this._currentOutlineItemButton.disabled = true;
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}
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/**
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* @type {number} One of the values in {SidebarView}.
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*/
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get visibleView() {
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return this.isOpen ? this.active : SidebarView.NONE;
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}
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/**
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* @param {number} view - The sidebar view that should become visible,
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* must be one of the values in {SidebarView}.
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*/
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setInitialView(view = SidebarView.NONE) {
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if (this.isInitialViewSet) {
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return;
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}
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this.isInitialViewSet = true;
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// If the user has already manually opened the sidebar, immediately closing
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// it would be bad UX; also ignore the "unknown" sidebar view value.
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if (view === SidebarView.NONE || view === SidebarView.UNKNOWN) {
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this.#dispatchEvent();
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return;
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}
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this.switchView(view, /* forceOpen = */ true);
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// Prevent dispatching two back-to-back "sidebarviewchanged" events,
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// since `this.switchView` dispatched the event if the view changed.
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if (!this.isInitialEventDispatched) {
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this.#dispatchEvent();
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}
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}
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/**
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* @param {number} view - The sidebar view that should be switched to,
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* must be one of the values in {SidebarView}.
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* @param {boolean} [forceOpen] - Ensure that the sidebar is open.
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* The default value is `false`.
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*/
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switchView(view, forceOpen = false) {
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const isViewChanged = view !== this.active;
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let shouldForceRendering = false;
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switch (view) {
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case SidebarView.NONE:
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if (this.isOpen) {
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this.close();
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}
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return; // Closing will trigger rendering and dispatch the event.
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case SidebarView.THUMBS:
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if (this.isOpen && isViewChanged) {
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shouldForceRendering = true;
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}
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break;
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case SidebarView.OUTLINE:
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if (this.outlineButton.disabled) {
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return;
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}
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break;
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case SidebarView.ATTACHMENTS:
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if (this.attachmentsButton.disabled) {
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return;
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}
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break;
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case SidebarView.LAYERS:
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if (this.layersButton.disabled) {
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return;
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}
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break;
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default:
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console.error(`PDFSidebar.switchView: "${view}" is not a valid view.`);
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return;
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}
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// Update the active view *after* it has been validated above,
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// in order to prevent setting it to an invalid state.
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this.active = view;
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// Update the CSS classes (and aria attributes), for all buttons and views.
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toggleCheckedBtn(
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this.thumbnailButton,
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view === SidebarView.THUMBS,
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this.thumbnailView
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);
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toggleCheckedBtn(
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this.outlineButton,
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view === SidebarView.OUTLINE,
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this.outlineView
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);
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toggleCheckedBtn(
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this.attachmentsButton,
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view === SidebarView.ATTACHMENTS,
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this.attachmentsView
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);
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toggleCheckedBtn(
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this.layersButton,
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view === SidebarView.LAYERS,
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this.layersView
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);
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// Finally, update view-specific CSS classes.
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this._outlineOptionsContainer.classList.toggle(
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"hidden",
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view !== SidebarView.OUTLINE
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);
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if (forceOpen && !this.isOpen) {
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this.open();
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return; // Opening will trigger rendering and dispatch the event.
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}
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if (shouldForceRendering) {
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this.#updateThumbnailViewer();
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this.#forceRendering();
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}
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if (isViewChanged) {
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this.#dispatchEvent();
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}
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}
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open() {
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if (this.isOpen) {
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return;
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}
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this.isOpen = true;
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this.toggleButton.classList.add("toggled");
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this.toggleButton.setAttribute("aria-expanded", "true");
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this.outerContainer.classList.add("sidebarMoving", "sidebarOpen");
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if (this.active === SidebarView.THUMBS) {
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this.#updateThumbnailViewer();
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}
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this.#forceRendering();
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this.#dispatchEvent();
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this.#hideUINotification();
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}
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close() {
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if (!this.isOpen) {
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return;
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}
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this.isOpen = false;
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this.toggleButton.classList.remove("toggled");
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this.toggleButton.setAttribute("aria-expanded", "false");
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this.outerContainer.classList.add("sidebarMoving");
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this.outerContainer.classList.remove("sidebarOpen");
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this.#forceRendering();
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this.#dispatchEvent();
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}
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toggle() {
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if (this.isOpen) {
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this.close();
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} else {
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this.open();
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}
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}
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#dispatchEvent() {
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if (this.isInitialViewSet && !this.isInitialEventDispatched) {
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this.isInitialEventDispatched = true;
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}
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this.eventBus.dispatch("sidebarviewchanged", {
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source: this,
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view: this.visibleView,
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});
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}
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#forceRendering() {
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if (this.onToggled) {
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this.onToggled();
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} else {
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// Fallback
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this.pdfViewer.forceRendering();
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this.pdfThumbnailViewer.forceRendering();
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}
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}
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#updateThumbnailViewer() {
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const { pdfViewer, pdfThumbnailViewer } = this;
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// Use the rendered pages to set the corresponding thumbnail images.
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const pagesCount = pdfViewer.pagesCount;
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for (let pageIndex = 0; pageIndex < pagesCount; pageIndex++) {
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const pageView = pdfViewer.getPageView(pageIndex);
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if (pageView?.renderingState === RenderingStates.FINISHED) {
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const thumbnailView = pdfThumbnailViewer.getThumbnail(pageIndex);
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thumbnailView.setImage(pageView);
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}
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}
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pdfThumbnailViewer.scrollThumbnailIntoView(pdfViewer.currentPageNumber);
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}
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#showUINotification() {
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this.toggleButton.setAttribute(
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"data-l10n-id",
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"toggle_sidebar_notification2"
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);
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this.l10n.translate(this.toggleButton);
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if (!this.isOpen) {
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// Only show the notification on the `toggleButton` if the sidebar is
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// currently closed, to avoid unnecessarily bothering the user.
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this.toggleButton.classList.add(UI_NOTIFICATION_CLASS);
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}
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}
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#hideUINotification(reset = false) {
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if (this.isOpen || reset) {
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// Only hide the notification on the `toggleButton` if the sidebar is
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// currently open, or when the current PDF document is being closed.
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this.toggleButton.classList.remove(UI_NOTIFICATION_CLASS);
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}
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if (reset) {
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this.toggleButton.setAttribute("data-l10n-id", "toggle_sidebar");
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this.l10n.translate(this.toggleButton);
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}
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}
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#addEventListeners() {
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this.sidebarContainer.addEventListener("transitionend", evt => {
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if (evt.target === this.sidebarContainer) {
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this.outerContainer.classList.remove("sidebarMoving");
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}
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});
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this.toggleButton.addEventListener("click", () => {
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this.toggle();
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});
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// Buttons for switching views.
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this.thumbnailButton.addEventListener("click", () => {
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this.switchView(SidebarView.THUMBS);
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});
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this.outlineButton.addEventListener("click", () => {
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this.switchView(SidebarView.OUTLINE);
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});
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this.outlineButton.addEventListener("dblclick", () => {
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this.eventBus.dispatch("toggleoutlinetree", { source: this });
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});
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this.attachmentsButton.addEventListener("click", () => {
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this.switchView(SidebarView.ATTACHMENTS);
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});
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this.layersButton.addEventListener("click", () => {
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this.switchView(SidebarView.LAYERS);
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});
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this.layersButton.addEventListener("dblclick", () => {
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this.eventBus.dispatch("resetlayers", { source: this });
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});
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// Buttons for view-specific options.
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this._currentOutlineItemButton.addEventListener("click", () => {
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this.eventBus.dispatch("currentoutlineitem", { source: this });
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});
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// Disable/enable views.
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const onTreeLoaded = (count, button, view) => {
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button.disabled = !count;
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if (count) {
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this.#showUINotification();
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} else if (this.active === view) {
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// If the `view` was opened by the user during document load,
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// switch away from it if it turns out to be empty.
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this.switchView(SidebarView.THUMBS);
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}
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};
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this.eventBus._on("outlineloaded", evt => {
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onTreeLoaded(evt.outlineCount, this.outlineButton, SidebarView.OUTLINE);
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evt.currentOutlineItemPromise.then(enabled => {
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if (!this.isInitialViewSet) {
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return;
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}
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this._currentOutlineItemButton.disabled = !enabled;
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});
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});
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this.eventBus._on("attachmentsloaded", evt => {
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onTreeLoaded(
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evt.attachmentsCount,
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this.attachmentsButton,
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SidebarView.ATTACHMENTS
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);
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});
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this.eventBus._on("layersloaded", evt => {
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onTreeLoaded(evt.layersCount, this.layersButton, SidebarView.LAYERS);
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});
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// Update the thumbnailViewer, if visible, when exiting presentation mode.
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this.eventBus._on("presentationmodechanged", evt => {
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if (
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evt.state === PresentationModeState.NORMAL &&
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this.visibleView === SidebarView.THUMBS
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) {
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this.#updateThumbnailViewer();
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}
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});
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}
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}
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export { PDFSidebar };
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