Bug 545395 - Prompt user when closing with more than one tab open [r=vingtetun]

mobile/app/mobile.js

@@ -42,6 +42,8 @@ pref("browser.chromeURL", "chrome://browser/content/");
 
 pref("browser.startup.homepage", "about:firstrun");
 
+pref("browser.tabs.warnOnClose", true);
+
 #if MOZ_PLATFORM_MAEMO
 pref("browser.ui.cursor", false);
 #elifdef WINCE

mobile/chrome/content/browser.js

@@ -568,7 +568,35 @@ var Browser = {
 
   closing: function closing() {
     // Prompt if we have multiple tabs before closing window
-    // TODO: bug 545395
+    let numTabs = this._tabs.length;
+    if (numTabs > 1) {
+      let shouldPrompt = gPrefService.getBoolPref("browser.tabs.warnOnClose");
+      if (shouldPrompt) {
+        let prompt = Cc["@mozilla.org/embedcomp/prompt-service;1"].getService(Ci.nsIPromptService);
+  
+        // Default to true: if it were false, we wouldn't get this far
+        let warnOnClose = { value: true };
+
+        let messageBase = Elements.browserBundle.getString("tabs.closeWarning");
+        let message = PluralForm.get(numTabs, messageBase).replace("#1", numTabs);
+
+        let title = Elements.browserBundle.getString("tabs.closeWarningTitle");
+        let closeText = Elements.browserBundle.getString("tabs.closeButton");
+        let checkText = Elements.browserBundle.getString("tabs.closeWarningPromptMe");
+        let buttons = (prompt.BUTTON_TITLE_IS_STRING * prompt.BUTTON_POS_0) +
+                      (prompt.BUTTON_TITLE_CANCEL * prompt.BUTTON_POS_1);
+        let pressed = prompt.confirmEx(window, title, message, buttons, closeText, null, null, checkText, warnOnClose);
+
+        // Don't set the pref unless they press OK and it's false
+        let reallyClose = (pressed == 0);
+        if (reallyClose && !warnOnClose.value)
+          gPrefService.setBoolPref("browser.tabs.warnOnClose", false);
+
+        // If we don't want to close, return now. If we are closing, continue with other housekeeping.
+        if (!reallyClose)
+          return false;
+      }
+    }
 
     // Figure out if there's at least one other browser window around.
     let lastBrowser = true;

mobile/locales/en-US/chrome/browser.properties

@@ -120,6 +120,17 @@ offlineApps.notNow=Not Now
 # Bookmark List
 bookmarkList.desktop=Desktop Bookmarks
 
+# Closing Tabs
+tabs.closeWarningTitle=Confirm close
+
+# LOCALIZATION NOTE (tabs.closeWarning): Semi-colon list of plural forms.
+# See: http://developer.mozilla.org/en/docs/Localization_and_Plurals
+# #1 number of tabs (must be greater than 1)
+tabs.closeWarning=NOT USED;You are about to close #1 tabs. Continue?
+
+tabs.closeButton=Close tabs
+tabs.closeWarningPromptMe=Warn me when I attempt to close multiple tabs
+
 # Homepage
 homepage.custom=Custom