From af9abdaf4f4ff1ad03cf6a015eeefb876bd300cf Mon Sep 17 00:00:00 2001
From: wixette <wixette@gmail.com>
Date: Sun, 8 Mar 2020 16:55:36 +0800
Subject: [PATCH] use local storage to cache locale choice

---
 js/l10n.js  | 20 ++++++++++++++++++++
 js/panel.js |  3 +++
 2 files changed, 23 insertions(+)

diff --git a/js/l10n.js b/js/l10n.js
index a45c8e1..ed7e3da 100644
--- a/js/l10n.js
+++ b/js/l10n.js
@@ -72,6 +72,11 @@ l10n.MESSAGES = {
  */
 l10n.current = 0;
 
+/**
+ * Local storage key.
+ */
+l10n.localStorageKey = 'sim8800locale';
+
 /**
  * Switches to the next locale.
  */
@@ -79,6 +84,21 @@ l10n.nextLocale = function() {
     l10n.current++;
     l10n.current = l10n.current % l10n.LOCALES.length;
     l10n.updateMessages();
+    localStorage.setItem(l10n.localStorageKey, l10n.current);
+};
+
+/**
+ * Restores the last locale from local storage.
+ */
+l10n.restoreLocale = function() {
+    var val = localStorage.getItem(l10n.localStorageKey);
+    if (val) {
+        var index = parseInt(val);
+        if (!isNaN(index)) {
+            l10n.current = index % l10n.LOCALES.length;
+            l10n.updateMessages();
+        }
+    }
 };
 
 /**
diff --git a/js/panel.js b/js/panel.js
index 8161ba5..3b7e129 100644
--- a/js/panel.js
+++ b/js/panel.js
@@ -553,6 +553,9 @@ panel.sim = null;
  * Initializes thie UI.
  */
 panel.init = function() {
+    // Restores the last locale if it exists.
+    l10n.restoreLocale();
+
     // Initializes event listener for nav buttons.
     var button = document.getElementById('locale');
     button.addEventListener('click', l10n.nextLocale, false);