Improve display tags (#1117)

* Update tag style

* Add styles/HTML for notifications

* Add DisplayNotification class

* Add support for tag notifications

* Simplify notification content

1 files changed, 90 insertions, 0 deletions

diff --git a/ext/mixed/js/display-notification.js b/ext/mixed/js/display-notification.js
new file mode 100644
index 00000000..2d3c50bb
--- /dev/null
+++ b/ext/mixed/js/display-notification.js
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2017-2020  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 DisplayNotification {
+    constructor(container, node) {
+        this._container = container;
+        this._node = node;
+        this._body = node.querySelector('.footer-notification-body');
+        this._closeButton = node.querySelector('.footer-notification-close-button');
+        this._eventListeners = new EventListenerCollection();
+        this._closeTimer = null;
+    }
+
+    open() {
+        if (!this.isClosed()) { return; }
+
+        this._clearTimer();
+
+        const node = this._node;
+        this._container.appendChild(node);
+        const style = getComputedStyle(node);
+        node.hidden = true;
+        style.getPropertyValue('opacity'); // Force CSS update, allowing animation
+        node.hidden = false;
+        this._eventListeners.addEventListener(this._closeButton, 'click', this._onCloseButtonClick.bind(this), false);
+    }
+
+    close(animate=false) {
+        if (this.isClosed()) { return; }
+
+        if (animate) {
+            if (this._closeTimer !== null) { return; }
+
+            this._node.hidden = true;
+            this._closeTimer = setTimeout(this._onDelayClose.bind(this), 200);
+        } else {
+            this._clearTimer();
+
+            this._eventListeners.removeAllEventListeners();
+            const parent = this._node.parentNode;
+            if (parent !== null) {
+                parent.removeChild(this._node);
+            }
+        }
+    }
+
+    setContent(text) {
+        this._body.textContent = text;
+    }
+
+    isClosing() {
+        return this._closeTimer !== null;
+    }
+
+    isClosed() {
+        return this._node.parentNode === null;
+    }
+
+    // Private
+
+    _onCloseButtonClick() {
+        this.close(true);
+    }
+
+    _onDelayClose() {
+        this._closeTimer = null;
+        this.close(false);
+    }
+
+    _clearTimer() {
+        if (this._closeTimer !== null) {
+            clearTimeout(this._closeTimer);
+            this._closeTimer = null;
+        }
+    }
+}