Add hotkeys to change dictionary (#1243)

* Add nextEntryDifferentDictionary and previousEntryDifferentDictionary hotkeys

* Update settings

ext/bg/settings2.html

@@ -2879,6 +2879,8 @@
             <option value="previousEntry3">Go to previous entry (x3)</option>
             <option value="lastEntry">Go to last entry</option>
             <option value="firstEntry">Go to first entry</option>
+            <option value="nextEntryDifferentDictionary">Go to next dictionary</option>
+            <option value="previousEntryDifferentDictionary">Go to previous dictionary</option>
             <option value="historyBackward">Navigate backward in history</option>
             <option value="historyForward">Navigate forward in history</option>
             <option value="addNoteKanji">Add kanji note</option>

ext/mixed/js/display.js

@@ -130,7 +130,9 @@ class Display extends EventDispatcher {
             ['addNoteTermKana',   () => { this._tryAddAnkiNoteForSelectedDefinition('term-kana'); }],
             ['viewNote',          () => { this._tryViewAnkiNoteForSelectedDefinition(); }],
             ['playAudio',         () => { this._playAudioCurrent(); }],
-            ['copyHostSelection', () => this._copyHostSelection()]
+            ['copyHostSelection', () => this._copyHostSelection()],
+            ['nextEntryDifferentDictionary',     () => { this._focusEntryWithDifferentDictionary(1, true); }],
+            ['previousEntryDifferentDictionary', () => { this._focusEntryWithDifferentDictionary(-1, true); }]
         ]);
         this.registerMessageHandlers([
             ['setMode', {async: false, handler: this._onMessageSetMode.bind(this)}]
@@ -1144,6 +1146,32 @@ class Display extends EventDispatcher {
         }
     }
 
+    _focusEntryWithDifferentDictionary(offset, smooth) {
+        const offsetSign = Math.sign(offset);
+        if (offsetSign === 0) { return false; }
+
+        let index = this._index;
+        const definitionCount = this._definitions.length;
+        if (index < 0 || index >= definitionCount) { return false; }
+
+        const {dictionary} = this._definitions[index];
+        for (let indexNext = index + offsetSign; indexNext >= 0 && indexNext < definitionCount; indexNext += offsetSign) {
+            const {dictionaryNames} = this._definitions[indexNext];
+            if (dictionaryNames.length > 1 || !dictionaryNames.includes(dictionary)) {
+                offset -= offsetSign;
+                if (Math.sign(offsetSign) !== offset) {
+                    index = indexNext;
+                    break;
+                }
+            }
+        }
+
+        if (index === this._index) { return false; }
+
+        this._focusEntry(index, smooth);
+        return true;
+    }
+
     _sourceTermView() {
         this._relativeTermView(false);
     }