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https://github.com/zen-browser/pdf.js.git
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511458fbbc
This implements a new Page scrolling mode, essentially bringing (and extending) the functionality from `PDFSinglePageViewer` into the regular `PDFViewer`-class. Compared to `PDFSinglePageViewer`, which as its name suggests will only display one page at a time, in the `PDFViewer`-implementation this new Page scrolling mode also support spreadModes properly (somewhat similar to e.g. Adobe Reader). Given the size and scope of these changes, I've tried to focus on implementing the basic functionality. Hence there's room for further clean-up and/or improvements, including e.g. simplifying the CSS/JS related to PresentationMode and implementing easier page-switching with the mouse-wheel/arrow-keys.
363 lines
11 KiB
JavaScript
363 lines
11 KiB
JavaScript
/* Copyright 2012 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 { SCROLLBAR_PADDING, ScrollMode, SpreadMode } from "./ui_utils.js";
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import { CursorTool } from "./pdf_cursor_tools.js";
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import { PDFSinglePageViewer } from "./pdf_single_page_viewer.js";
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/**
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* @typedef {Object} SecondaryToolbarOptions
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* @property {HTMLDivElement} toolbar - Container for the secondary toolbar.
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* @property {HTMLButtonElement} toggleButton - Button to toggle the visibility
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* of the secondary toolbar.
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* @property {HTMLDivElement} toolbarButtonContainer - Container where all the
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* toolbar buttons are placed. The maximum height of the toolbar is controlled
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* dynamically by adjusting the 'max-height' CSS property of this DOM element.
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* @property {HTMLButtonElement} presentationModeButton - Button for entering
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* presentation mode.
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* @property {HTMLButtonElement} openFileButton - Button to open a file.
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* @property {HTMLButtonElement} printButton - Button to print the document.
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* @property {HTMLButtonElement} downloadButton - Button to download the
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* document.
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* @property {HTMLAnchorElement} viewBookmarkButton - Button to obtain a
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* bookmark link to the current location in the document.
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* @property {HTMLButtonElement} firstPageButton - Button to go to the first
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* page in the document.
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* @property {HTMLButtonElement} lastPageButton - Button to go to the last page
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* in the document.
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* @property {HTMLButtonElement} pageRotateCwButton - Button to rotate the pages
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* clockwise.
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* @property {HTMLButtonElement} pageRotateCcwButton - Button to rotate the
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* pages counterclockwise.
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* @property {HTMLButtonElement} cursorSelectToolButton - Button to enable the
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* select tool.
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* @property {HTMLButtonElement} cursorHandToolButton - Button to enable the
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* hand tool.
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* @property {HTMLButtonElement} documentPropertiesButton - Button for opening
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* the document properties dialog.
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*/
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class SecondaryToolbar {
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/**
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* @param {SecondaryToolbarOptions} options
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* @param {HTMLDivElement} mainContainer
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* @param {EventBus} eventBus
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*/
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constructor(options, mainContainer, eventBus) {
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this.toolbar = options.toolbar;
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this.toggleButton = options.toggleButton;
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this.toolbarButtonContainer = options.toolbarButtonContainer;
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this.buttons = [
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{
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element: options.presentationModeButton,
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eventName: "presentationmode",
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close: true,
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},
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{ element: options.openFileButton, eventName: "openfile", close: true },
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{ element: options.printButton, eventName: "print", close: true },
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{ element: options.downloadButton, eventName: "download", close: true },
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{ element: options.viewBookmarkButton, eventName: null, close: true },
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{ element: options.firstPageButton, eventName: "firstpage", close: true },
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{ element: options.lastPageButton, eventName: "lastpage", close: true },
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{
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element: options.pageRotateCwButton,
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eventName: "rotatecw",
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close: false,
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},
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{
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element: options.pageRotateCcwButton,
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eventName: "rotateccw",
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close: false,
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},
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{
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element: options.cursorSelectToolButton,
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eventName: "switchcursortool",
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eventDetails: { tool: CursorTool.SELECT },
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close: true,
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},
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{
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element: options.cursorHandToolButton,
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eventName: "switchcursortool",
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eventDetails: { tool: CursorTool.HAND },
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close: true,
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},
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{
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element: options.scrollPageButton,
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eventName: "switchscrollmode",
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eventDetails: { mode: ScrollMode.PAGE },
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close: true,
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},
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{
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element: options.scrollVerticalButton,
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eventName: "switchscrollmode",
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eventDetails: { mode: ScrollMode.VERTICAL },
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close: true,
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},
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{
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element: options.scrollHorizontalButton,
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eventName: "switchscrollmode",
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eventDetails: { mode: ScrollMode.HORIZONTAL },
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close: true,
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},
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{
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element: options.scrollWrappedButton,
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eventName: "switchscrollmode",
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eventDetails: { mode: ScrollMode.WRAPPED },
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close: true,
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},
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{
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element: options.spreadNoneButton,
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eventName: "switchspreadmode",
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eventDetails: { mode: SpreadMode.NONE },
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close: true,
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},
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{
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element: options.spreadOddButton,
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eventName: "switchspreadmode",
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eventDetails: { mode: SpreadMode.ODD },
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close: true,
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},
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{
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element: options.spreadEvenButton,
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eventName: "switchspreadmode",
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eventDetails: { mode: SpreadMode.EVEN },
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close: true,
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},
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{
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element: options.documentPropertiesButton,
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eventName: "documentproperties",
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close: true,
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},
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];
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this.items = {
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firstPage: options.firstPageButton,
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lastPage: options.lastPageButton,
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pageRotateCw: options.pageRotateCwButton,
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pageRotateCcw: options.pageRotateCcwButton,
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};
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this.mainContainer = mainContainer;
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this.eventBus = eventBus;
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this.opened = false;
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this.containerHeight = null;
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this.previousContainerHeight = null;
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this.reset();
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// Bind the event listeners for click, cursor tool, and scroll/spread mode
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// actions.
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this._bindClickListeners();
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this._bindCursorToolsListener(options);
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this._bindScrollModeListener(options);
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this._bindSpreadModeListener(options);
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// Bind the event listener for adjusting the 'max-height' of the toolbar.
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this.eventBus._on("resize", this._setMaxHeight.bind(this));
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// Hide the Scroll/Spread mode buttons, when they're not applicable to the
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// current `BaseViewer` instance (in particular `PDFSinglePageViewer`).
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this.eventBus._on("baseviewerinit", evt => {
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if (evt.source instanceof PDFSinglePageViewer) {
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this.toolbarButtonContainer.classList.add(
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"hiddenScrollModeButtons",
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"hiddenSpreadModeButtons"
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);
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} else {
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this.toolbarButtonContainer.classList.remove(
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"hiddenScrollModeButtons",
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"hiddenSpreadModeButtons"
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);
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}
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});
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}
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/**
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* @type {boolean}
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*/
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get isOpen() {
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return this.opened;
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}
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setPageNumber(pageNumber) {
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this.pageNumber = pageNumber;
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this._updateUIState();
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}
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setPagesCount(pagesCount) {
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this.pagesCount = pagesCount;
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this._updateUIState();
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}
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reset() {
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this.pageNumber = 0;
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this.pagesCount = 0;
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this._updateUIState();
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// Reset the Scroll/Spread buttons too, since they're document specific.
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this.eventBus.dispatch("secondarytoolbarreset", { source: this });
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}
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_updateUIState() {
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this.items.firstPage.disabled = this.pageNumber <= 1;
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this.items.lastPage.disabled = this.pageNumber >= this.pagesCount;
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this.items.pageRotateCw.disabled = this.pagesCount === 0;
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this.items.pageRotateCcw.disabled = this.pagesCount === 0;
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}
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_bindClickListeners() {
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// Button to toggle the visibility of the secondary toolbar.
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this.toggleButton.addEventListener("click", this.toggle.bind(this));
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// All items within the secondary toolbar.
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for (const { element, eventName, close, eventDetails } of this.buttons) {
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element.addEventListener("click", evt => {
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if (eventName !== null) {
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const details = { source: this };
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for (const property in eventDetails) {
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details[property] = eventDetails[property];
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}
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this.eventBus.dispatch(eventName, details);
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}
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if (close) {
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this.close();
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}
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});
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}
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}
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_bindCursorToolsListener(buttons) {
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this.eventBus._on("cursortoolchanged", function ({ tool }) {
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buttons.cursorSelectToolButton.classList.toggle(
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"toggled",
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tool === CursorTool.SELECT
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);
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buttons.cursorHandToolButton.classList.toggle(
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"toggled",
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tool === CursorTool.HAND
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);
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});
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}
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_bindScrollModeListener(buttons) {
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function scrollModeChanged({ mode }) {
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buttons.scrollPageButton.classList.toggle(
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"toggled",
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mode === ScrollMode.PAGE
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);
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buttons.scrollVerticalButton.classList.toggle(
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"toggled",
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mode === ScrollMode.VERTICAL
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);
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buttons.scrollHorizontalButton.classList.toggle(
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"toggled",
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mode === ScrollMode.HORIZONTAL
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);
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buttons.scrollWrappedButton.classList.toggle(
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"toggled",
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mode === ScrollMode.WRAPPED
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);
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// Temporarily *disable* the Spread buttons when horizontal scrolling is
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// enabled, since the non-default Spread modes doesn't affect the layout.
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const isScrollModeHorizontal = mode === ScrollMode.HORIZONTAL;
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buttons.spreadNoneButton.disabled = isScrollModeHorizontal;
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buttons.spreadOddButton.disabled = isScrollModeHorizontal;
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buttons.spreadEvenButton.disabled = isScrollModeHorizontal;
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}
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this.eventBus._on("scrollmodechanged", scrollModeChanged);
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this.eventBus._on("secondarytoolbarreset", evt => {
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if (evt.source === this) {
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scrollModeChanged({ mode: ScrollMode.VERTICAL });
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}
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});
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}
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_bindSpreadModeListener(buttons) {
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function spreadModeChanged({ mode }) {
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buttons.spreadNoneButton.classList.toggle(
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"toggled",
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mode === SpreadMode.NONE
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);
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buttons.spreadOddButton.classList.toggle(
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"toggled",
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mode === SpreadMode.ODD
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);
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buttons.spreadEvenButton.classList.toggle(
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"toggled",
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mode === SpreadMode.EVEN
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);
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}
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this.eventBus._on("spreadmodechanged", spreadModeChanged);
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this.eventBus._on("secondarytoolbarreset", evt => {
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if (evt.source === this) {
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spreadModeChanged({ mode: SpreadMode.NONE });
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}
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});
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}
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open() {
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if (this.opened) {
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return;
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}
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this.opened = true;
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this._setMaxHeight();
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this.toggleButton.classList.add("toggled");
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this.toggleButton.setAttribute("aria-expanded", "true");
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this.toolbar.classList.remove("hidden");
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}
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close() {
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if (!this.opened) {
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return;
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}
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this.opened = false;
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this.toolbar.classList.add("hidden");
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this.toggleButton.classList.remove("toggled");
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this.toggleButton.setAttribute("aria-expanded", "false");
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}
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toggle() {
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if (this.opened) {
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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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/**
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* @private
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*/
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_setMaxHeight() {
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if (!this.opened) {
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return; // Only adjust the 'max-height' if the toolbar is visible.
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}
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this.containerHeight = this.mainContainer.clientHeight;
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if (this.containerHeight === this.previousContainerHeight) {
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return;
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}
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this.toolbarButtonContainer.style.maxHeight = `${
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this.containerHeight - SCROLLBAR_PADDING
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}px`;
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this.previousContainerHeight = this.containerHeight;
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}
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}
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export { SecondaryToolbar };
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