Add commands for selecting the next tab and previous tab.

1 files changed, 24 insertions, 0 deletions

diff --git a/background_page.html b/background_page.html
index fc19fa4a..7ba89c41 100644
--- a/background_page.html
+++ b/background_page.html
@@ -62,6 +62,27 @@
     chrome.tabs.create({}, function(tab) { callback(); });
   }
 
+  function nextTab() { selectTab("next"); }
+  function previousTab() { selectTab("previous"); }
+
+  /*
+   * Selects a tab before or after the currently selected tab. Direction is either "next" or "previous".
+   */
+  function selectTab(direction) {
+    chrome.tabs.getAllInWindow(null, function(tabs) {
+      if (tabs.length <= 1)
+        return;
+      for (var i = 0; i < tabs.length; i++) {
+        if (tabs[i].selected) {
+          var delta = (direction == "next") ? 1 : -1;
+          var toSelect = tabs[(i + delta + tabs.length) % tabs.length];
+          chrome.tabs.update(toSelect.id, { selected: true });
+          break;
+        }
+      }
+    });
+  }
+
   function removeTab(callback) {
     getCurrentTabWithScrollPosition(function(tab, scrollX, scrollY) {
                                       tabQueue.push({ tabUrl: tab.url, scrollX: scrollX, scrollY: scrollY });
@@ -108,6 +129,9 @@
   keyToCommandRegistry['fo'] = 'goForward';
   keyToCommandRegistry['L']  = 'goForward';
 
+  keyToCommandRegistry['J']  = nextTab;
+  keyToCommandRegistry['K']  = previousTab;
+
   keyToCommandRegistry['t']  = createTab;
   keyToCommandRegistry['d']  = removeTab;
   keyToCommandRegistry['u']  = restoreTab;