Generalize modal, move to popup-elements.js (#931)

1 files changed, 114 insertions, 0 deletions

diff --git a/ext/bg/js/settings/popup-elements.js b/ext/bg/js/settings/popup-elements.js
new file mode 100644
index 00000000..1a35ddc9
--- /dev/null
+++ b/ext/bg/js/settings/popup-elements.js
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2020  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 PopupElement extends EventDispatcher {
+    constructor({node, visibleClassName, openingClassName, closingClassName, closingAnimationDuration}) {
+        super();
+        this._node = node;
+        this._visibleClassName = visibleClassName;
+        this._openingClassName = openingClassName;
+        this._closingClassName = closingClassName;
+        this._closingAnimationDuration = closingAnimationDuration;
+        this._mutationObserver = null;
+        this._visible = false;
+        this._closeTimer = null;
+    }
+
+    get node() {
+        return this._node;
+    }
+
+    isVisible() {
+        return this._node.classList.contains(this._visibleClassName);
+    }
+
+    setVisible(value, animate=true) {
+        value = !!value;
+        const {classList} = this._node;
+        if (classList.contains(this._visibleClassName) === value) { return; }
+
+        if (this._closeTimer !== null) {
+            clearTimeout(this._closeTimer);
+            this._closeTimer = null;
+        }
+
+        if (value) {
+            if (animate) { classList.add(this._openingClassName); }
+            classList.remove(this._closingClassName);
+            getComputedStyle(this._node).getPropertyValue('display'); // Force update of CSS display property, allowing animation
+            classList.add(this._visibleClassName);
+            if (animate) { classList.remove(this._openingClassName); }
+            this._node.focus();
+        } else {
+            if (animate) { classList.add(this._closingClassName); }
+            classList.remove(this._visibleClassName);
+            if (animate) {
+                this._closeTimer = setTimeout(() => {
+                    this._closeTimer = null;
+                    classList.remove(this._closingClassName);
+                }, this._closingAnimationDuration);
+            }
+        }
+    }
+
+    on(eventName, callback) {
+        if (eventName === 'visibilityChanged') {
+            if (this._mutationObserver === null) {
+                this._visible = this._node.classList.contains(this._visibleClassName);
+                this._mutationObserver = new MutationObserver(this._onMutation.bind(this));
+                this._mutationObserver.observe(this._node, {
+                    attributes: true,
+                    attributeFilter: ['class'],
+                    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._node.classList.contains(this._visibleClassName);
+        if (this._visible === visible) { return; }
+        this._visible = visible;
+        this.trigger('visibilityChanged', {visible});
+    }
+}
+
+class Modal extends EventDispatcher {
+    constructor(node) {
+        super({
+            node,
+            visibleClassName: 'modal-container-open',
+            openingClassName: 'modal-container-opening',
+            closingClassName: 'modal-container-closing',
+            closingAnimationDuration: 375 // Milliseconds; includes buffer
+        });
+    }
+}