366 lines
12 KiB
JavaScript
366 lines
12 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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animationStarted,
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DEFAULT_SCALE,
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DEFAULT_SCALE_VALUE,
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docStyle,
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MAX_SCALE,
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MIN_SCALE,
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noContextMenuHandler,
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} from "./ui_utils.js";
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import { AnnotationEditorType } from "pdfjs-lib";
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const PAGE_NUMBER_LOADING_INDICATOR = "visiblePageIsLoading";
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/**
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* @typedef {Object} ToolbarOptions
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* @property {HTMLDivElement} container - Container for the secondary toolbar.
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* @property {HTMLSpanElement} numPages - Label that contains number of pages.
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* @property {HTMLInputElement} pageNumber - Control for display and user input
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* of the current page number.
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* @property {HTMLSelectElement} scaleSelect - Scale selection control.
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* Its width is adjusted, when necessary, on UI localization.
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* @property {HTMLOptionElement} customScaleOption - The item used to display
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* a non-predefined scale.
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* @property {HTMLButtonElement} previous - Button to go to the previous page.
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* @property {HTMLButtonElement} next - Button to go to the next page.
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* @property {HTMLButtonElement} zoomIn - Button to zoom in the pages.
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* @property {HTMLButtonElement} zoomOut - Button to zoom out the pages.
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* @property {HTMLButtonElement} viewFind - Button to open find bar.
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* @property {HTMLButtonElement} openFile - Button to open a new document.
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* @property {HTMLButtonElement} presentationModeButton - Button to switch to
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* presentation mode.
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* @property {HTMLButtonElement} editorNoneButton - Button to disable editing.
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* @property {HTMLButtonElement} editorFreeTextButton - Button to switch to
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* FreeText editing.
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* @property {HTMLButtonElement} download - Button to download the document.
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* @property {HTMLAnchorElement} viewBookmark - Button to obtain a bookmark link
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* to the current location in the document.
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*/
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class Toolbar {
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/**
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* @param {ToolbarOptions} options
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* @param {EventBus} eventBus
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* @param {IL10n} l10n - Localization service.
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*/
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constructor(options, eventBus, l10n) {
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this.toolbar = options.container;
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this.eventBus = eventBus;
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this.l10n = l10n;
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this.buttons = [
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{ element: options.previous, eventName: "previouspage" },
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{ element: options.next, eventName: "nextpage" },
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{ element: options.zoomIn, eventName: "zoomin" },
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{ element: options.zoomOut, eventName: "zoomout" },
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{ element: options.print, eventName: "print" },
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{
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element: options.presentationModeButton,
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eventName: "presentationmode",
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},
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{ element: options.download, eventName: "download" },
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{ element: options.viewBookmark, eventName: null },
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{
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element: options.editorNoneButton,
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eventName: "switchannotationeditormode",
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eventDetails: { mode: AnnotationEditorType.NONE },
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},
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{
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element: options.editorFreeTextButton,
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eventName: "switchannotationeditormode",
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eventDetails: { mode: AnnotationEditorType.FREETEXT },
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},
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{
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element: options.editorInkButton,
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eventName: "switchannotationeditormode",
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eventDetails: { mode: AnnotationEditorType.INK },
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},
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];
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if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
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this.buttons.push({ element: options.openFile, eventName: "openfile" });
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}
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this.items = {
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numPages: options.numPages,
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pageNumber: options.pageNumber,
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scaleSelect: options.scaleSelect,
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customScaleOption: options.customScaleOption,
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previous: options.previous,
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next: options.next,
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zoomIn: options.zoomIn,
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zoomOut: options.zoomOut,
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editorNoneButton: options.editorNoneButton,
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editorFreeTextButton: options.editorFreeTextButton,
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editorFreeTextParamsToolbar: options.editorFreeTextParamsToolbar,
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editorInkButton: options.editorInkButton,
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editorInkParamsToolbar: options.editorInkParamsToolbar,
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};
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this._wasLocalized = false;
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this.reset();
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// Bind the event listeners for click and various other actions.
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this._bindListeners(options);
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}
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setPageNumber(pageNumber, pageLabel) {
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this.pageNumber = pageNumber;
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this.pageLabel = pageLabel;
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this._updateUIState(false);
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}
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setPagesCount(pagesCount, hasPageLabels) {
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this.pagesCount = pagesCount;
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this.hasPageLabels = hasPageLabels;
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this._updateUIState(true);
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}
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setPageScale(pageScaleValue, pageScale) {
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this.pageScaleValue = (pageScaleValue || pageScale).toString();
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this.pageScale = pageScale;
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this._updateUIState(false);
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}
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reset() {
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this.pageNumber = 0;
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this.pageLabel = null;
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this.hasPageLabels = false;
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this.pagesCount = 0;
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this.pageScaleValue = DEFAULT_SCALE_VALUE;
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this.pageScale = DEFAULT_SCALE;
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this._updateUIState(true);
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this.updateLoadingIndicatorState();
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// Reset the Editor buttons too, since they're document specific.
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this.eventBus.dispatch("toolbarreset", { source: this });
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}
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_bindListeners(options) {
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const { pageNumber, scaleSelect } = this.items;
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const self = this;
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// The buttons within the toolbar.
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for (const { element, eventName, 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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if (eventDetails) {
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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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}
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this.eventBus.dispatch(eventName, details);
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}
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});
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}
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// The non-button elements within the toolbar.
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pageNumber.addEventListener("click", function () {
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this.select();
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});
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pageNumber.addEventListener("change", function () {
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self.eventBus.dispatch("pagenumberchanged", {
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source: self,
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value: this.value,
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});
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});
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scaleSelect.addEventListener("change", function () {
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if (this.value === "custom") {
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return;
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}
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self.eventBus.dispatch("scalechanged", {
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source: self,
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value: this.value,
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});
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});
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// Here we depend on browsers dispatching the "click" event *after* the
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// "change" event, when the <select>-element changes.
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scaleSelect.addEventListener("click", function (evt) {
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const target = evt.target;
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// Remove focus when an <option>-element was *clicked*, to improve the UX
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// for mouse users (fixes bug 1300525 and issue 4923).
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if (
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this.value === self.pageScaleValue &&
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target.tagName.toUpperCase() === "OPTION"
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) {
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this.blur();
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}
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});
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// Suppress context menus for some controls.
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scaleSelect.oncontextmenu = noContextMenuHandler;
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this.eventBus._on("localized", () => {
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this._wasLocalized = true;
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this.#adjustScaleWidth();
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this._updateUIState(true);
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});
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this.#bindEditorToolsListener(options);
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}
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#bindEditorToolsListener({
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editorNoneButton,
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editorFreeTextButton,
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editorFreeTextParamsToolbar,
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editorInkButton,
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editorInkParamsToolbar,
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}) {
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const editorModeChanged = (evt, disableButtons = false) => {
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const editorButtons = [
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{ mode: AnnotationEditorType.NONE, button: editorNoneButton },
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{
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mode: AnnotationEditorType.FREETEXT,
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button: editorFreeTextButton,
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toolbar: editorFreeTextParamsToolbar,
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},
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{
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mode: AnnotationEditorType.INK,
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button: editorInkButton,
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toolbar: editorInkParamsToolbar,
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},
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];
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for (const { mode, button, toolbar } of editorButtons) {
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const checked = mode === evt.mode;
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button.classList.toggle("toggled", checked);
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button.setAttribute("aria-checked", checked);
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button.disabled = disableButtons;
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if (toolbar) {
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toolbar.classList.toggle("hidden", !checked);
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}
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}
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};
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this.eventBus._on("annotationeditormodechanged", editorModeChanged);
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this.eventBus._on("toolbarreset", evt => {
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if (evt.source === this) {
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editorModeChanged(
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{ mode: AnnotationEditorType.NONE },
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/* disableButtons = */ true
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);
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}
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});
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}
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_updateUIState(resetNumPages = false) {
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if (!this._wasLocalized) {
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// Don't update the UI state until we localize the toolbar.
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return;
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}
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const { pageNumber, pagesCount, pageScaleValue, pageScale, items } = this;
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if (resetNumPages) {
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if (this.hasPageLabels) {
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items.pageNumber.type = "text";
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} else {
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items.pageNumber.type = "number";
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this.l10n.get("of_pages", { pagesCount }).then(msg => {
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items.numPages.textContent = msg;
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});
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}
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items.pageNumber.max = pagesCount;
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}
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if (this.hasPageLabels) {
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items.pageNumber.value = this.pageLabel;
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this.l10n.get("page_of_pages", { pageNumber, pagesCount }).then(msg => {
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items.numPages.textContent = msg;
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});
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} else {
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items.pageNumber.value = pageNumber;
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}
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items.previous.disabled = pageNumber <= 1;
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items.next.disabled = pageNumber >= pagesCount;
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items.zoomOut.disabled = pageScale <= MIN_SCALE;
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items.zoomIn.disabled = pageScale >= MAX_SCALE;
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this.l10n
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.get("page_scale_percent", { scale: Math.round(pageScale * 10000) / 100 })
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.then(msg => {
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let predefinedValueFound = false;
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for (const option of items.scaleSelect.options) {
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if (option.value !== pageScaleValue) {
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option.selected = false;
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continue;
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}
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option.selected = true;
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predefinedValueFound = true;
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}
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if (!predefinedValueFound) {
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items.customScaleOption.textContent = msg;
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items.customScaleOption.selected = true;
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}
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});
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}
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updateLoadingIndicatorState(loading = false) {
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const { pageNumber } = this.items;
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pageNumber.classList.toggle(PAGE_NUMBER_LOADING_INDICATOR, loading);
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}
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/**
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* Increase the width of the zoom dropdown DOM element if, and only if, it's
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* too narrow to fit the *longest* of the localized strings.
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*/
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async #adjustScaleWidth() {
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const { items, l10n } = this;
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const predefinedValuesPromise = Promise.all([
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l10n.get("page_scale_auto"),
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l10n.get("page_scale_actual"),
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l10n.get("page_scale_fit"),
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l10n.get("page_scale_width"),
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]);
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await animationStarted;
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const style = getComputedStyle(items.scaleSelect),
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scaleSelectContainerWidth = parseInt(
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style.getPropertyValue("--scale-select-container-width"),
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10
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),
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scaleSelectOverflow = parseInt(
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style.getPropertyValue("--scale-select-overflow"),
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10
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);
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// The temporary canvas is used to measure text length in the DOM.
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const canvas = document.createElement("canvas");
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const ctx = canvas.getContext("2d", { alpha: false });
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ctx.font = `${style.fontSize} ${style.fontFamily}`;
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let maxWidth = 0;
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for (const predefinedValue of await predefinedValuesPromise) {
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const { width } = ctx.measureText(predefinedValue);
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if (width > maxWidth) {
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maxWidth = width;
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}
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}
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maxWidth += 2 * scaleSelectOverflow;
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if (maxWidth > scaleSelectContainerWidth) {
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docStyle.setProperty("--scale-select-container-width", `${maxWidth}px`);
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}
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// Zeroing the width and height cause Firefox to release graphics resources
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// immediately, which can greatly reduce memory consumption.
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canvas.width = 0;
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canvas.height = 0;
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}
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}
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export { Toolbar };
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