104 lines
3.4 KiB
JavaScript
104 lines
3.4 KiB
JavaScript
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/*
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* Copyright (C) 2020 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 PanelElement extends EventDispatcher {
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constructor({node, closingAnimationDuration}) {
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super();
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this._node = node;
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this._closingAnimationDuration = closingAnimationDuration;
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this._hiddenAnimatingClass = 'hidden-animating';
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this._mutationObserver = null;
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this._visible = false;
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this._closeTimer = null;
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}
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get node() {
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return this._node;
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}
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isVisible() {
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return !this._node.hidden;
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}
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setVisible(value, animate=true) {
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value = !!value;
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if (this.isVisible() === value) { return; }
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if (this._closeTimer !== null) {
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clearTimeout(this._closeTimer);
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this._completeClose(true);
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}
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const node = this._node;
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const {classList} = node;
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if (value) {
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if (animate) { classList.add(this._hiddenAnimatingClass); }
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getComputedStyle(node).getPropertyValue('display'); // Force update of CSS display property, allowing animation
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classList.remove(this._hiddenAnimatingClass);
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node.hidden = false;
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node.focus();
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} else {
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if (animate) { classList.add(this._hiddenAnimatingClass); }
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node.hidden = true;
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if (animate) {
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this._closeTimer = setTimeout(() => this._completeClose(false), this._closingAnimationDuration);
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}
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}
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}
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on(eventName, callback) {
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if (eventName === 'visibilityChanged') {
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if (this._mutationObserver === null) {
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this._visible = this.isVisible();
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this._mutationObserver = new MutationObserver(this._onMutation.bind(this));
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this._mutationObserver.observe(this._node, {
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attributes: true,
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attributeFilter: ['hidden'],
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attributeOldValue: true
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});
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}
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}
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return super.on(eventName, callback);
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}
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off(eventName, callback) {
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const result = super.off(eventName, callback);
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if (eventName === 'visibilityChanged' && !this.hasListeners(eventName)) {
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if (this._mutationObserver !== null) {
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this._mutationObserver.disconnect();
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this._mutationObserver = null;
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}
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}
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return result;
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}
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// Private
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_onMutation() {
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const visible = this.isVisible();
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if (this._visible === visible) { return; }
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this._visible = visible;
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this.trigger('visibilityChanged', {visible});
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}
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_completeClose(reopening) {
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this._closeTimer = null;
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this._node.classList.remove(this._hiddenAnimatingClass);
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this.trigger('closeCompleted', {reopening});
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}
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}
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