3 files changed, 123 insertions, 0 deletions
diff --git a/ext/mixed/js/display-generator.js b/ext/mixed/js/display-generator.js
index 1810000b..1ccd5941 100644
--- a/ext/mixed/js/display-generator.js
+++ b/ext/mixed/js/display-generator.js
@@ -117,6 +117,10 @@ class DisplayGenerator {
         return node;
     }
 
+    createEmptyFooterNotification() {
+        return this._templates.instantiate('footer-notification');
+    }
+
     // Private
 
     _createTermExpression(details) {
@@ -310,6 +314,7 @@ class DisplayGenerator {
 
         node.title = details.notes;
         inner.textContent = details.name;
+        node.dataset.details = details.notes || details.name;
         node.dataset.category = details.category;
         if (details.redundant) { node.dataset.redundant = 'true'; }
 
@@ -472,6 +477,7 @@ class DisplayGenerator {
         node.dataset.readingIsSame = `${reading === expression}`;
         node.dataset.dictionary = dictionary;
         node.dataset.frequency = frequency;
+        node.dataset.details = `${dictionary}: ${frequency}`;
 
         return node;
     }
@@ -486,6 +492,7 @@ class DisplayGenerator {
         node.dataset.character = character;
         node.dataset.dictionary = dictionary;
         node.dataset.frequency = frequency;
+        node.dataset.details = `${dictionary}: ${frequency}`;
 
         return node;
     }
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;
+        }
+    }
+}
diff --git a/ext/mixed/js/display.js b/ext/mixed/js/display.js
index 26a05abd..77bf9649 100644
--- a/ext/mixed/js/display.js
+++ b/ext/mixed/js/display.js
@@ -20,6 +20,7 @@
  * AudioSystem
  * DisplayGenerator
  * DisplayHistory
+ * DisplayNotification
  * DocumentUtil
  * FrameEndpoint
  * Frontend
@@ -114,6 +115,8 @@ class Display extends EventDispatcher {
         this._frameResizeStartSize = null;
         this._frameResizeStartOffset = null;
         this._frameResizeEventListeners = new EventListenerCollection();
+        this._tagNotification = null;
+        this._tagNotificationContainer = document.querySelector('#content-footer');
 
         this.registerActions([
             ['close',             () => { this.onEscape(); }],
@@ -543,6 +546,7 @@ class Display extends EventDispatcher {
             this._closePopups();
             this._eventListeners.removeAllEventListeners();
             this._mediaLoader.unloadAll();
+            this._hideTagNotification(false);
 
             // Prepare
             const urlSearchParams = new URLSearchParams(location.search);
@@ -799,6 +803,27 @@ class Display extends EventDispatcher {
         this._entrySetCurrent(index);
     }
 
+    _onTagClick(e) {
+        const node = e.currentTarget;
+        const {dataset: {details}} = node;
+        this._showTagNotification(details);
+    }
+
+    _showTagNotification(content) {
+        if (this._tagNotification === null) {
+            const node = this._displayGenerator.createEmptyFooterNotification();
+            this._tagNotification = new DisplayNotification(this._tagNotificationContainer, node);
+        }
+
+        this._tagNotification.setContent(content);
+        this._tagNotification.open();
+    }
+
+    _hideTagNotification(animate) {
+        if (this._tagNotification === null) { return; }
+        this._tagNotification.close(animate);
+    }
+
     _updateDocumentOptions(options) {
         const data = document.documentElement.dataset;
         data.ankiEnabled = `${options.anki.enable}`;
@@ -1720,6 +1745,7 @@ class Display extends EventDispatcher {
         this._addMultipleEventListeners(entry, '.action-play-audio', 'click', this._onAudioPlay.bind(this));
         this._addMultipleEventListeners(entry, '.kanji-link', 'click', this._onKanjiLookup.bind(this));
         this._addMultipleEventListeners(entry, '.debug-log-link', 'click', this._onDebugLogClick.bind(this));
+        this._addMultipleEventListeners(entry, '.tag', 'click', this._onTagClick.bind(this));
     }
 
     _updateDefinitionTextScanner(options) {