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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});
}
}
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