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-rw-r--r--ext/js/display/element-overflow-controller.js129
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diff --git a/ext/js/display/element-overflow-controller.js b/ext/js/display/element-overflow-controller.js
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+/*
+ * Copyright (C) 2021 Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+class ElementOverflowController {
+ constructor() {
+ this._elements = [];
+ this._checkTimer = null;
+ this._eventListeners = new EventListenerCollection();
+ this._windowEventListeners = new EventListenerCollection();
+ this._dictionaries = new Map();
+ this._updateBind = this._update.bind(this);
+ this._onWindowResizeBind = this._onWindowResize.bind(this);
+ this._onToggleButtonClickBind = this._onToggleButtonClick.bind(this);
+ }
+
+ setOptions(options) {
+ this._dictionaries.clear();
+ for (const [dictionary, {definitionsCollapsible}] of Object.entries(options.dictionaries)) {
+ let collapsible = false;
+ let collapsed = false;
+ switch (definitionsCollapsible) {
+ case 'expanded':
+ collapsible = true;
+ break;
+ case 'collapsed':
+ collapsible = true;
+ collapsed = true;
+ break;
+ }
+ if (!collapsible) { continue; }
+ this._dictionaries.set(dictionary, {collapsed});
+ }
+ }
+
+ addElements(entry) {
+ if (this._dictionaries.size === 0) { return; }
+
+ const elements = entry.querySelectorAll('.definition-item-inner');
+ let any = false;
+ for (const element of elements) {
+ const {dictionary} = element.parentNode.dataset;
+ const dictionaryInfo = this._dictionaries.get(dictionary);
+ if (typeof dictionaryInfo === 'undefined') { continue; }
+
+ this._updateElement(element);
+ this._elements.push(element);
+
+ if (dictionaryInfo.collapsed) {
+ element.classList.add('collapsed');
+ }
+
+ const button = element.querySelector('.definition-item-expansion-button');
+ if (button !== null) {
+ this._eventListeners.addEventListener(button, 'click', this._onToggleButtonClickBind, false);
+ }
+
+ any = true;
+ }
+
+ if (any && this._windowEventListeners.size === 0) {
+ this._windowEventListeners.addEventListener(window, 'resize', this._onWindowResizeBind, false);
+ }
+ }
+
+ clearElements() {
+ if (this._elements.length === 0) { return; }
+ this._elements = [];
+ this._windowEventListeners.removeAllEventListeners();
+ }
+
+ // Private
+
+ _onWindowResize() {
+ if (this._checkTimer !== null) {
+ this._cancelIdleCallback(this._checkTimer);
+ }
+ this._checkTimer = this._requestIdleCallback(this._updateBind, 100);
+ }
+
+ _onToggleButtonClick(e) {
+ const container = e.currentTarget.closest('.definition-item-inner');
+ if (container === null) { return; }
+ container.classList.toggle('collapsed');
+ }
+
+ _update() {
+ for (const element of this._elements) {
+ this._updateElement(element);
+ }
+ }
+
+ _updateElement(element) {
+ const {classList} = element;
+ classList.add('collapse-test');
+ const collapsible = element.scrollHeight > element.clientHeight || element.scrollWidth > element.clientWidth;
+ classList.toggle('collapsible', collapsible);
+ classList.remove('collapse-test');
+ }
+
+ _requestIdleCallback(callback, timeout) {
+ if (typeof requestIdleCallback === 'function') {
+ return requestIdleCallback(callback, {timeout});
+ } else {
+ return setTimeout(callback, timeout);
+ }
+ }
+
+ _cancelIdleCallback(handle) {
+ if (typeof cancelIdleCallback === 'function') {
+ cancelIdleCallback(handle);
+ } else {
+ clearTimeout(handle);
+ }
+ }
+}