/* * 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}); } }