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vendor/yomitan/js/dom/panel-element.js

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+/*
+ * Copyright (C) 2023-2025  Yomitan Authors
+ * Copyright (C) 2020-2022  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/>.
+ */
+
+import {EventDispatcher} from '../core/event-dispatcher.js';
+
+/**
+ * @augments EventDispatcher<import('panel-element').Events>
+ */
+export class PanelElement extends EventDispatcher {
+    /**
+     * @param {HTMLElement} node
+     * @param {number} closingAnimationDuration
+     */
+    constructor(node, closingAnimationDuration) {
+        super();
+        /** @type {HTMLElement} */
+        this._node = node;
+        /** @type {number} */
+        this._closingAnimationDuration = closingAnimationDuration;
+        /** @type {string} */
+        this._hiddenAnimatingClass = 'hidden-animating';
+        /** @type {?MutationObserver} */
+        this._mutationObserver = null;
+        /** @type {boolean} */
+        this._visible = false;
+        /** @type {?import('core').Timeout} */
+        this._closeTimer = null;
+    }
+
+    /** @type {HTMLElement} */
+    get node() {
+        return this._node;
+    }
+
+    /**
+     * @returns {boolean}
+     */
+    isVisible() {
+        return !this._node.hidden;
+    }
+
+    /**
+     * @param {boolean} value
+     * @param {boolean} [animate]
+     */
+    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);
+            }
+        }
+    }
+
+    /**
+     * @template {import('core').EventNames<import('panel-element').Events>} TName
+     * @param {TName} eventName
+     * @param {(details: import('core').EventArgument<import('panel-element').Events, TName>) => void} callback
+     */
+    on(eventName, callback) {
+        if (eventName === 'visibilityChanged' && 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,
+            });
+        }
+        super.on(eventName, callback);
+    }
+
+    /**
+     * @template {import('core').EventNames<import('panel-element').Events>} TName
+     * @param {TName} eventName
+     * @param {(details: import('core').EventArgument<import('panel-element').Events, TName>) => void} callback
+     * @returns {boolean}
+     */
+    off(eventName, callback) {
+        const result = super.off(eventName, callback);
+        if (eventName === 'visibilityChanged' && !this.hasListeners(eventName) && 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});
+    }
+
+    /**
+     * @param {boolean} reopening
+     */
+    _completeClose(reopening) {
+        this._closeTimer = null;
+        this._node.classList.remove(this._hiddenAnimatingClass);
+        this.trigger('closeCompleted', {reopening});
+    }
+}