03f10739d8
Note how the end of the `{PDFOutlineViewer, PDFAttachmentViewer, PDFLayerViewer}.render` methods share *almost* identical code, hence we can reduce some duplication by introducing the new `BaseTreeViewer` helper method here.
Furthermore, setting `this._lastToggleIsShow` can be made ever so slightly more efficient, since we don't care about the number of ".treeItemsHidden"-classes but only want to know if at least one exists.
126 lines
3.3 KiB
JavaScript
126 lines
3.3 KiB
JavaScript
/* Copyright 2020 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 { removeNullCharacters } from "pdfjs-lib";
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class BaseTreeViewer {
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constructor(options) {
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if (this.constructor === BaseTreeViewer) {
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throw new Error("Cannot initialize BaseTreeViewer.");
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}
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this.container = options.container;
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this.eventBus = options.eventBus;
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this.reset();
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}
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reset() {
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this._lastToggleIsShow = true;
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// Remove the tree from the DOM.
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this.container.textContent = "";
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// Ensure that the left (right in RTL locales) margin is always reset,
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// to prevent incorrect tree alignment if a new document is opened.
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this.container.classList.remove("treeWithDeepNesting");
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}
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/**
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* @private
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*/
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_dispatchEvent(count) {
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throw new Error("Not implemented: _dispatchEvent");
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}
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/**
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* @private
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*/
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_bindLink(element, params) {
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throw new Error("Not implemented: _bindLink");
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}
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/**
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* @private
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*/
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_normalizeTextContent(str) {
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return removeNullCharacters(str) || /* en dash = */ "\u2013";
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}
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/**
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* Prepend a button before a tree item which allows the user to collapse or
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* expand all tree items at that level; see `_toggleTreeItem`.
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* @private
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*/
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_addToggleButton(div, hidden = false) {
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const toggler = document.createElement("div");
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toggler.className = "treeItemToggler";
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if (hidden) {
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toggler.classList.add("treeItemsHidden");
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}
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toggler.onclick = evt => {
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evt.stopPropagation();
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toggler.classList.toggle("treeItemsHidden");
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if (evt.shiftKey) {
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const shouldShowAll = !toggler.classList.contains("treeItemsHidden");
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this._toggleTreeItem(div, shouldShowAll);
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}
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};
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div.insertBefore(toggler, div.firstChild);
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}
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/**
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* Collapse or expand the subtree of a tree item.
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*
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* @param {Element} root - the root of the item (sub)tree.
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* @param {boolean} show - whether to show the item (sub)tree. If false,
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* the item subtree rooted at `root` will be collapsed.
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* @private
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*/
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_toggleTreeItem(root, show = false) {
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this._lastToggleIsShow = show;
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for (const toggler of root.querySelectorAll(".treeItemToggler")) {
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toggler.classList.toggle("treeItemsHidden", !show);
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}
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}
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/**
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* Collapse or expand all subtrees of the `container`.
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* @private
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*/
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_toggleAllTreeItems() {
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this._toggleTreeItem(this.container, !this._lastToggleIsShow);
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}
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/**
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* @private
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*/
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_finishRendering(fragment, count, hasAnyNesting = false) {
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if (hasAnyNesting) {
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this.container.classList.add("treeWithDeepNesting");
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this._lastToggleIsShow = !fragment.querySelector(".treeItemsHidden");
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}
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this.container.appendChild(fragment);
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this._dispatchEvent(count);
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}
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render(params) {
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throw new Error("Not implemented: render");
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}
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}
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export { BaseTreeViewer };
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