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-rw-r--r--ext/js/dom/panel-element.js103
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diff --git a/ext/js/dom/panel-element.js b/ext/js/dom/panel-element.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/>.
+ */
+
+class PanelElement extends EventDispatcher {
+ constructor({node, closingAnimationDuration}) {
+ super();
+ this._node = node;
+ this._closingAnimationDuration = closingAnimationDuration;
+ this._hiddenAnimatingClass = 'hidden-animating';
+ this._mutationObserver = null;
+ this._visible = false;
+ this._closeTimer = null;
+ }
+
+ get node() {
+ return this._node;
+ }
+
+ isVisible() {
+ return !this._node.hidden;
+ }
+
+ setVisible(value, animate=true) {
+ value = !!value;
+ if (this.isVisible() === value) { return; }
+
+ if (this._closeTimer !== null) {
+ clearTimeout(this._closeTimer);
+ this._completeClose(true);
+ }
+
+ const node = this._node;
+ const {classList} = node;
+ if (value) {
+ if (animate) { classList.add(this._hiddenAnimatingClass); }
+ getComputedStyle(node).getPropertyValue('display'); // Force update of CSS display property, allowing animation
+ classList.remove(this._hiddenAnimatingClass);
+ node.hidden = false;
+ node.focus();
+ } else {
+ if (animate) { classList.add(this._hiddenAnimatingClass); }
+ node.hidden = true;
+ if (animate) {
+ this._closeTimer = setTimeout(() => this._completeClose(false), this._closingAnimationDuration);
+ }
+ }
+ }
+
+ on(eventName, callback) {
+ if (eventName === 'visibilityChanged') {
+ if (this._mutationObserver === null) {
+ this._visible = this.isVisible();
+ this._mutationObserver = new MutationObserver(this._onMutation.bind(this));
+ this._mutationObserver.observe(this._node, {
+ attributes: true,
+ attributeFilter: ['hidden'],
+ attributeOldValue: true
+ });
+ }
+ }
+ return super.on(eventName, callback);
+ }
+
+ off(eventName, callback) {
+ const result = super.off(eventName, callback);
+ if (eventName === 'visibilityChanged' && !this.hasListeners(eventName)) {
+ if (this._mutationObserver !== null) {
+ this._mutationObserver.disconnect();
+ this._mutationObserver = null;
+ }
+ }
+ return result;
+ }
+
+ // Private
+
+ _onMutation() {
+ const visible = this.isVisible();
+ if (this._visible === visible) { return; }
+ this._visible = visible;
+ this.trigger('visibilityChanged', {visible});
+ }
+
+ _completeClose(reopening) {
+ this._closeTimer = null;
+ this._node.classList.remove(this._hiddenAnimatingClass);
+ this.trigger('closeCompleted', {reopening});
+ }
+}