Modal refactor (#842)

* Add Modal class

* Use Modal class

1 files changed, 65 insertions, 0 deletions

diff --git a/ext/bg/js/settings/modal.js b/ext/bg/js/settings/modal.js
new file mode 100644
index 00000000..42a511ca
--- /dev/null
+++ b/ext/bg/js/settings/modal.js
@@ -0,0 +1,65 @@
+/*
+ * 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 Modal extends EventDispatcher {
+    constructor(node) {
+        super();
+        this._node = node;
+        this._eventListeners = new EventListenerCollection();
+    }
+
+    get node() {
+        return this._node;
+    }
+
+    setVisible(value) {
+        this._getWrappedNode().modal(value ? 'show' : 'hide');
+    }
+
+    on(eventName, callback) {
+        if (eventName === 'visibilityChanged') {
+            if (this._eventListeners.size === 0) {
+                const wrappedNode = this._getWrappedNode();
+                this._eventListeners.on(wrappedNode, 'hidden.bs.modal', this._onModalHide.bind(this));
+                this._eventListeners.on(wrappedNode, 'shown.bs.modal', this._onModalShow.bind(this));
+            }
+        }
+        return super.on(eventName, callback);
+    }
+
+    off(eventName, callback) {
+        const result = super.off(eventName, callback);
+        if (eventName === 'visibilityChanged' && !this.hasListeners(eventName)) {
+            this._eventListeners.removeAllEventListeners();
+        }
+        return result;
+    }
+
+    // Private
+
+    _onModalHide() {
+        this.trigger('visibilityChanged', {visible: false});
+    }
+
+    _onModalShow() {
+        this.trigger('visibilityChanged', {visible: true});
+    }
+
+    _getWrappedNode() {
+        return $(this._node);
+    }
+}