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diff --git a/ext/js/pages/settings/modal.js b/ext/js/pages/settings/modal.js
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+/*
+ * Copyright (C) 2020-2021 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/>.
+ */
+
+/* global
+ * PanelElement
+ */
+
+class Modal extends PanelElement {
+ constructor(node) {
+ super({
+ node,
+ closingAnimationDuration: 375 // Milliseconds; includes buffer
+ });
+ this._contentNode = null;
+ this._canCloseOnClick = false;
+ }
+
+ prepare() {
+ const node = this.node;
+ this._contentNode = node.querySelector('.modal-content');
+ let dimmerNode = node.querySelector('.modal-content-dimmer');
+ if (dimmerNode === null) { dimmerNode = node; }
+ dimmerNode.addEventListener('mousedown', this._onModalContainerMouseDown.bind(this), false);
+ dimmerNode.addEventListener('mouseup', this._onModalContainerMouseUp.bind(this), false);
+ dimmerNode.addEventListener('click', this._onModalContainerClick.bind(this), false);
+
+ for (const actionNode of node.querySelectorAll('[data-modal-action]')) {
+ actionNode.addEventListener('click', this._onActionNodeClick.bind(this), false);
+ }
+ }
+
+ // Private
+
+ _onModalContainerMouseDown(e) {
+ this._canCloseOnClick = (e.currentTarget === e.target);
+ }
+
+ _onModalContainerMouseUp(e) {
+ if (!this._canCloseOnClick) { return; }
+ this._canCloseOnClick = (e.currentTarget === e.target);
+ }
+
+ _onModalContainerClick(e) {
+ if (!this._canCloseOnClick) { return; }
+ this._canCloseOnClick = false;
+ if (e.currentTarget !== e.target) { return; }
+ this.setVisible(false);
+ }
+
+ _onActionNodeClick(e) {
+ const {modalAction} = e.currentTarget.dataset;
+ switch (modalAction) {
+ case 'expand':
+ this._setExpanded(true);
+ break;
+ case 'collapse':
+ this._setExpanded(false);
+ break;
+ }
+ }
+
+ _setExpanded(expanded) {
+ if (this._contentNode === null) { return; }
+ this._contentNode.classList.toggle('modal-content-full', expanded);
+ }
+}