ca244d9bca
Over time, as we've been introducing JavaScript code to modify CSS variables, we've been adding shorthand properties to various classes to reduce unnecessary repetition when accessing the document-styles. Rather than repeating this in multiple places, it seems overall simpler to just introduce a constant and re-use that throughout the viewer instead.
288 lines
9.2 KiB
JavaScript
288 lines
9.2 KiB
JavaScript
/* Copyright 2016 Mozilla Foundation
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
import {
|
|
animationStarted,
|
|
DEFAULT_SCALE,
|
|
DEFAULT_SCALE_VALUE,
|
|
docStyle,
|
|
MAX_SCALE,
|
|
MIN_SCALE,
|
|
noContextMenuHandler,
|
|
} from "./ui_utils.js";
|
|
|
|
const PAGE_NUMBER_LOADING_INDICATOR = "visiblePageIsLoading";
|
|
|
|
/**
|
|
* @typedef {Object} ToolbarOptions
|
|
* @property {HTMLDivElement} container - Container for the secondary toolbar.
|
|
* @property {HTMLSpanElement} numPages - Label that contains number of pages.
|
|
* @property {HTMLInputElement} pageNumber - Control for display and user input
|
|
* of the current page number.
|
|
* @property {HTMLSelectElement} scaleSelect - Scale selection control.
|
|
* Its width is adjusted, when necessary, on UI localization.
|
|
* @property {HTMLOptionElement} customScaleOption - The item used to display
|
|
* a non-predefined scale.
|
|
* @property {HTMLButtonElement} previous - Button to go to the previous page.
|
|
* @property {HTMLButtonElement} next - Button to go to the next page.
|
|
* @property {HTMLButtonElement} zoomIn - Button to zoom in the pages.
|
|
* @property {HTMLButtonElement} zoomOut - Button to zoom out the pages.
|
|
* @property {HTMLButtonElement} viewFind - Button to open find bar.
|
|
* @property {HTMLButtonElement} openFile - Button to open a new document.
|
|
* @property {HTMLButtonElement} presentationModeButton - Button to switch to
|
|
* presentation mode.
|
|
* @property {HTMLButtonElement} download - Button to download the document.
|
|
* @property {HTMLAnchorElement} viewBookmark - Button to obtain a bookmark link
|
|
* to the current location in the document.
|
|
*/
|
|
|
|
class Toolbar {
|
|
/**
|
|
* @param {ToolbarOptions} options
|
|
* @param {EventBus} eventBus
|
|
* @param {IL10n} l10n - Localization service.
|
|
*/
|
|
constructor(options, eventBus, l10n) {
|
|
this.toolbar = options.container;
|
|
this.eventBus = eventBus;
|
|
this.l10n = l10n;
|
|
this.buttons = [
|
|
{ element: options.previous, eventName: "previouspage" },
|
|
{ element: options.next, eventName: "nextpage" },
|
|
{ element: options.zoomIn, eventName: "zoomin" },
|
|
{ element: options.zoomOut, eventName: "zoomout" },
|
|
{ element: options.print, eventName: "print" },
|
|
{
|
|
element: options.presentationModeButton,
|
|
eventName: "presentationmode",
|
|
},
|
|
{ element: options.download, eventName: "download" },
|
|
{ element: options.viewBookmark, eventName: null },
|
|
];
|
|
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
|
|
this.buttons.push({ element: options.openFile, eventName: "openfile" });
|
|
}
|
|
this.items = {
|
|
numPages: options.numPages,
|
|
pageNumber: options.pageNumber,
|
|
scaleSelect: options.scaleSelect,
|
|
customScaleOption: options.customScaleOption,
|
|
previous: options.previous,
|
|
next: options.next,
|
|
zoomIn: options.zoomIn,
|
|
zoomOut: options.zoomOut,
|
|
};
|
|
|
|
this._wasLocalized = false;
|
|
this.reset();
|
|
|
|
// Bind the event listeners for click and various other actions.
|
|
this._bindListeners();
|
|
}
|
|
|
|
setPageNumber(pageNumber, pageLabel) {
|
|
this.pageNumber = pageNumber;
|
|
this.pageLabel = pageLabel;
|
|
this._updateUIState(false);
|
|
}
|
|
|
|
setPagesCount(pagesCount, hasPageLabels) {
|
|
this.pagesCount = pagesCount;
|
|
this.hasPageLabels = hasPageLabels;
|
|
this._updateUIState(true);
|
|
}
|
|
|
|
setPageScale(pageScaleValue, pageScale) {
|
|
this.pageScaleValue = (pageScaleValue || pageScale).toString();
|
|
this.pageScale = pageScale;
|
|
this._updateUIState(false);
|
|
}
|
|
|
|
reset() {
|
|
this.pageNumber = 0;
|
|
this.pageLabel = null;
|
|
this.hasPageLabels = false;
|
|
this.pagesCount = 0;
|
|
this.pageScaleValue = DEFAULT_SCALE_VALUE;
|
|
this.pageScale = DEFAULT_SCALE;
|
|
this._updateUIState(true);
|
|
this.updateLoadingIndicatorState();
|
|
}
|
|
|
|
_bindListeners() {
|
|
const { pageNumber, scaleSelect } = this.items;
|
|
const self = this;
|
|
|
|
// The buttons within the toolbar.
|
|
for (const { element, eventName } of this.buttons) {
|
|
element.addEventListener("click", evt => {
|
|
if (eventName !== null) {
|
|
this.eventBus.dispatch(eventName, { source: this });
|
|
}
|
|
});
|
|
}
|
|
// The non-button elements within the toolbar.
|
|
pageNumber.addEventListener("click", function () {
|
|
this.select();
|
|
});
|
|
pageNumber.addEventListener("change", function () {
|
|
self.eventBus.dispatch("pagenumberchanged", {
|
|
source: self,
|
|
value: this.value,
|
|
});
|
|
});
|
|
|
|
scaleSelect.addEventListener("change", function () {
|
|
if (this.value === "custom") {
|
|
return;
|
|
}
|
|
self.eventBus.dispatch("scalechanged", {
|
|
source: self,
|
|
value: this.value,
|
|
});
|
|
});
|
|
// Here we depend on browsers dispatching the "click" event *after* the
|
|
// "change" event, when the <select>-element changes.
|
|
scaleSelect.addEventListener("click", function (evt) {
|
|
const target = evt.target;
|
|
// Remove focus when an <option>-element was *clicked*, to improve the UX
|
|
// for mouse users (fixes bug 1300525 and issue 4923).
|
|
if (
|
|
this.value === self.pageScaleValue &&
|
|
target.tagName.toUpperCase() === "OPTION"
|
|
) {
|
|
this.blur();
|
|
}
|
|
});
|
|
// Suppress context menus for some controls.
|
|
scaleSelect.oncontextmenu = noContextMenuHandler;
|
|
|
|
this.eventBus._on("localized", () => {
|
|
this._wasLocalized = true;
|
|
this.#adjustScaleWidth();
|
|
this._updateUIState(true);
|
|
});
|
|
}
|
|
|
|
_updateUIState(resetNumPages = false) {
|
|
if (!this._wasLocalized) {
|
|
// Don't update the UI state until we localize the toolbar.
|
|
return;
|
|
}
|
|
const { pageNumber, pagesCount, pageScaleValue, pageScale, items } = this;
|
|
|
|
if (resetNumPages) {
|
|
if (this.hasPageLabels) {
|
|
items.pageNumber.type = "text";
|
|
} else {
|
|
items.pageNumber.type = "number";
|
|
this.l10n.get("of_pages", { pagesCount }).then(msg => {
|
|
items.numPages.textContent = msg;
|
|
});
|
|
}
|
|
items.pageNumber.max = pagesCount;
|
|
}
|
|
|
|
if (this.hasPageLabels) {
|
|
items.pageNumber.value = this.pageLabel;
|
|
this.l10n.get("page_of_pages", { pageNumber, pagesCount }).then(msg => {
|
|
items.numPages.textContent = msg;
|
|
});
|
|
} else {
|
|
items.pageNumber.value = pageNumber;
|
|
}
|
|
|
|
items.previous.disabled = pageNumber <= 1;
|
|
items.next.disabled = pageNumber >= pagesCount;
|
|
|
|
items.zoomOut.disabled = pageScale <= MIN_SCALE;
|
|
items.zoomIn.disabled = pageScale >= MAX_SCALE;
|
|
|
|
this.l10n
|
|
.get("page_scale_percent", { scale: Math.round(pageScale * 10000) / 100 })
|
|
.then(msg => {
|
|
let predefinedValueFound = false;
|
|
for (const option of items.scaleSelect.options) {
|
|
if (option.value !== pageScaleValue) {
|
|
option.selected = false;
|
|
continue;
|
|
}
|
|
option.selected = true;
|
|
predefinedValueFound = true;
|
|
}
|
|
if (!predefinedValueFound) {
|
|
items.customScaleOption.textContent = msg;
|
|
items.customScaleOption.selected = true;
|
|
}
|
|
});
|
|
}
|
|
|
|
updateLoadingIndicatorState(loading = false) {
|
|
const pageNumberInput = this.items.pageNumber;
|
|
|
|
pageNumberInput.classList.toggle(PAGE_NUMBER_LOADING_INDICATOR, loading);
|
|
}
|
|
|
|
/**
|
|
* Increase the width of the zoom dropdown DOM element if, and only if, it's
|
|
* too narrow to fit the *longest* of the localized strings.
|
|
*/
|
|
async #adjustScaleWidth() {
|
|
const { items, l10n } = this;
|
|
|
|
const predefinedValuesPromise = Promise.all([
|
|
l10n.get("page_scale_auto"),
|
|
l10n.get("page_scale_actual"),
|
|
l10n.get("page_scale_fit"),
|
|
l10n.get("page_scale_width"),
|
|
]);
|
|
await animationStarted;
|
|
|
|
const style = getComputedStyle(items.scaleSelect),
|
|
scaleSelectContainerWidth = parseInt(
|
|
style.getPropertyValue("--scale-select-container-width"),
|
|
10
|
|
),
|
|
scaleSelectOverflow = parseInt(
|
|
style.getPropertyValue("--scale-select-overflow"),
|
|
10
|
|
);
|
|
|
|
// The temporary canvas is used to measure text length in the DOM.
|
|
const canvas = document.createElement("canvas");
|
|
const ctx = canvas.getContext("2d", { alpha: false });
|
|
ctx.font = `${style.fontSize} ${style.fontFamily}`;
|
|
|
|
let maxWidth = 0;
|
|
for (const predefinedValue of await predefinedValuesPromise) {
|
|
const { width } = ctx.measureText(predefinedValue);
|
|
if (width > maxWidth) {
|
|
maxWidth = width;
|
|
}
|
|
}
|
|
maxWidth += 2 * scaleSelectOverflow;
|
|
|
|
if (maxWidth > scaleSelectContainerWidth) {
|
|
docStyle.setProperty("--scale-select-container-width", `${maxWidth}px`);
|
|
}
|
|
// Zeroing the width and height cause Firefox to release graphics resources
|
|
// immediately, which can greatly reduce memory consumption.
|
|
canvas.width = 0;
|
|
canvas.height = 0;
|
|
}
|
|
}
|
|
|
|
export { Toolbar };
|