Improve display tags (#1117)

* Update tag style

* Add styles/HTML for notifications

* Add DisplayNotification class

* Add support for tag notifications

* Simplify notification content

7 files changed, 221 insertions, 0 deletions

diff --git a/ext/bg/search.html b/ext/bg/search.html
index c0f98d8c..34d36478 100644
--- a/ext/bg/search.html
+++ b/ext/bg/search.html
@@ -65,6 +65,7 @@
                 </div>
             </div>
         </div>
+        <div class="content-footer-container1"><div class="content-footer-container2"><div class="content-footer" id="content-footer"></div><div class="scrollbar-spacer scrollbar"></div></div></div>
     </div>
 </div>
 
@@ -87,6 +88,7 @@
 <script src="/mixed/js/display.js"></script>
 <script src="/mixed/js/display-generator.js"></script>
 <script src="/mixed/js/display-history.js"></script>
+<script src="/mixed/js/display-notification.js"></script>
 <script src="/mixed/js/dynamic-loader.js"></script>
 <script src="/mixed/js/media-loader.js"></script>
 <script src="/mixed/js/scroll.js"></script>
diff --git a/ext/fg/float.html b/ext/fg/float.html
index 50c3b691..41e73a7e 100644
--- a/ext/fg/float.html
+++ b/ext/fg/float.html
@@ -52,6 +52,7 @@
                 </div>
             </div>
         </div>
+        <div class="content-footer-container1"><div class="content-footer-container2"><div class="content-footer" id="content-footer"></div><div class="scrollbar-spacer scrollbar"></div></div></div>
     </div>
     <div class="content-sidebar scrollbar" id="content-sidebar" hidden>
         <div class="content-sidebar-inner">
@@ -91,6 +92,7 @@
 <script src="/mixed/js/display.js"></script>
 <script src="/mixed/js/display-generator.js"></script>
 <script src="/mixed/js/display-history.js"></script>
+<script src="/mixed/js/display-notification.js"></script>
 <script src="/mixed/js/dynamic-loader.js"></script>
 <script src="/mixed/js/frame-endpoint.js"></script>
 <script src="/mixed/js/media-loader.js"></script>
diff --git a/ext/mixed/css/display.css b/ext/mixed/css/display.css
index 0a676a8f..d95aee2f 100644
--- a/ext/mixed/css/display.css
+++ b/ext/mixed/css/display.css
@@ -126,6 +126,10 @@
     --progress-bar-track-color: #cccccc;
     --progress-bar-indicator-color: var(--accent-color);
     --entry-current-indicator-color: var(--accent-color);
+
+    --notification-text-color: #ffffff;
+    --notification-background-color: #333333;
+    --notification-shadow-color: rgba(0, 0, 0, 0.5);
 }
 :root[data-theme=dark] {
     /* Colors */
@@ -182,6 +186,10 @@
     --progress-bar-track-color: #3a3a3a;
     --progress-bar-indicator-color: var(--accent-color);
     --entry-current-indicator-color: var(--accent-color);
+
+    --notification-text-color: #2f2f2f;
+    --notification-background-color: #e1e1e1;
+    --notification-shadow-color: rgba(255, 255, 255, 0.25);
 }
 
 
@@ -252,6 +260,13 @@ a {
 :root:not([data-theme=default]) .scrollbar::-webkit-scrollbar-corner {
     background-color: var(--scrollbar-track-color);
 }
+.scrollbar-spacer {
+    display: inline-block;
+    overflow-x: hidden;
+    overflow-y: scroll;
+    visibility: hidden;
+    flex: 0 1 auto;
+}
 
 
 /* Main layout */
@@ -284,6 +299,27 @@ a {
     width: 100%;
     padding: var(--main-content-vertical-padding) var(--main-content-horizontal-padding);
 }
+.content-footer-container1 {
+    display: flex;
+    flex-flow: row nowrap;
+    position: absolute;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    max-height: 100%;
+    pointer-events: none;
+    z-index: 5;
+}
+.content-footer-container2 {
+    display: flex;
+    flex-flow: row nowrap;
+    justify-content: center;
+    flex: 1 1 auto;
+}
+.content-footer {
+    max-width: var(--main-content-size);
+    width: 100%;
+}
 
 
 /* Sidebar layout */
@@ -519,6 +555,7 @@ button.action-button {
     background-color: var(--tag-default-background-color);
     border: var(--tag-border-size) var(--tag-border-style) var(--tag-border-color);
     margin-right: 0.375em;
+    cursor: pointer;
 }
 .tag[data-category=name] {
     background-color: var(--tag-name-background-color);
@@ -1165,6 +1202,57 @@ button.action-button {
 }
 
 
+/* Footer notifications */
+.footer-notification {
+    display: flex;
+    flex-flow: row nowrap;
+    align-items: center;
+    pointer-events: auto;
+    border-radius: 0.25em;
+    background-color: var(--notification-background-color);
+    box-shadow: 0 0.125em 0.25em 0 var(--notification-shadow-color);
+    color: var(--notification-text-color);
+    margin: 0.5em;
+    padding: 0.5em 0.75em;
+    transition: opacity var(--animation-duration) ease-out;
+}
+.footer-notification[hidden] {
+    display: flex;
+    opacity: 0;
+    transition: opacity var(--animation-duration) ease-in;
+}
+.footer-notification-body {
+    flex: 1 1 auto;
+    padding-right: 0.5em;
+}
+.footer-notification-close-button {
+    flex: 0 0 auto;
+    background-color: transparent;
+    margin: -0.25em;
+    padding: 0.5em;
+    border: none;
+    outline: none;
+    cursor: pointer;
+    font-size: inherit;
+}
+.footer-notification-close-button-icon {
+    display: block;
+    width: calc(12em / var(--font-size-no-units));
+    height: calc(12em / var(--font-size-no-units));
+    mask-repeat: no-repeat;
+    mask-position: center center;
+    mask-mode: alpha;
+    mask-size: var(--sidebar-button-icon-size) var(--sidebar-button-icon-size);
+    mask-image: url(/mixed/img/cross.svg);
+    -webkit-mask-repeat: no-repeat;
+    -webkit-mask-position: center center;
+    -webkit-mask-mode: alpha;
+    -webkit-mask-size: var(--sidebar-button-icon-size) var(--sidebar-button-icon-size);
+    -webkit-mask-image: url(/mixed/img/cross.svg);
+    background-color: var(--notification-text-color);
+}
+
+
 /* Conditional styles */
 :root:not([data-enable-search-tags=true]) .tag[data-category=search] {
     display: none;
diff --git a/ext/mixed/display-templates.html b/ext/mixed/display-templates.html
index 3953098d..40d11d7a 100644
--- a/ext/mixed/display-templates.html
+++ b/ext/mixed/display-templates.html
@@ -117,4 +117,10 @@
     </span>
 </span></template>
 
+<!-- Extra -->
+<template id="footer-notification-template"><div class="footer-notification">
+    <div class="footer-notification-body"></div>
+    <button class="footer-notification-close-button"><span class="footer-notification-close-button-icon"></span></button>
+</div></template>
+
 </body></html>
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) {