130 lines
4.3 KiB
JavaScript
130 lines
4.3 KiB
JavaScript
/*
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* Copyright (C) 2021-2022 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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class ElementOverflowController {
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constructor() {
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this._elements = [];
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this._checkTimer = null;
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this._eventListeners = new EventListenerCollection();
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this._windowEventListeners = new EventListenerCollection();
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this._dictionaries = new Map();
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this._updateBind = this._update.bind(this);
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this._onWindowResizeBind = this._onWindowResize.bind(this);
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this._onToggleButtonClickBind = this._onToggleButtonClick.bind(this);
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}
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setOptions(options) {
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this._dictionaries.clear();
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for (const {name, definitionsCollapsible} of options.dictionaries) {
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let collapsible = false;
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let collapsed = false;
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switch (definitionsCollapsible) {
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case 'expanded':
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collapsible = true;
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break;
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case 'collapsed':
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collapsible = true;
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collapsed = true;
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break;
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}
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if (!collapsible) { continue; }
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this._dictionaries.set(name, {collapsed});
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}
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}
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addElements(entry) {
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if (this._dictionaries.size === 0) { return; }
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const elements = entry.querySelectorAll('.definition-item-inner');
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let any = false;
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for (const element of elements) {
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const {dictionary} = element.parentNode.dataset;
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const dictionaryInfo = this._dictionaries.get(dictionary);
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if (typeof dictionaryInfo === 'undefined') { continue; }
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this._updateElement(element);
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this._elements.push(element);
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if (dictionaryInfo.collapsed) {
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element.classList.add('collapsed');
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}
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const button = element.querySelector('.definition-item-expansion-button');
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if (button !== null) {
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this._eventListeners.addEventListener(button, 'click', this._onToggleButtonClickBind, false);
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}
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any = true;
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}
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if (any && this._windowEventListeners.size === 0) {
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this._windowEventListeners.addEventListener(window, 'resize', this._onWindowResizeBind, false);
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}
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}
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clearElements() {
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if (this._elements.length === 0) { return; }
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this._elements = [];
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this._windowEventListeners.removeAllEventListeners();
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}
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// Private
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_onWindowResize() {
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if (this._checkTimer !== null) {
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this._cancelIdleCallback(this._checkTimer);
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}
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this._checkTimer = this._requestIdleCallback(this._updateBind, 100);
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}
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_onToggleButtonClick(e) {
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const container = e.currentTarget.closest('.definition-item-inner');
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if (container === null) { return; }
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container.classList.toggle('collapsed');
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}
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_update() {
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for (const element of this._elements) {
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this._updateElement(element);
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}
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}
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_updateElement(element) {
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const {classList} = element;
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classList.add('collapse-test');
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const collapsible = element.scrollHeight > element.clientHeight || element.scrollWidth > element.clientWidth;
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classList.toggle('collapsible', collapsible);
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classList.remove('collapse-test');
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}
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_requestIdleCallback(callback, timeout) {
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if (typeof requestIdleCallback === 'function') {
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return requestIdleCallback(callback, {timeout});
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} else {
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return setTimeout(callback, timeout);
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}
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}
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_cancelIdleCallback(handle) {
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if (typeof cancelIdleCallback === 'function') {
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cancelIdleCallback(handle);
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} else {
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clearTimeout(handle);
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}
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}
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}
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