From 4167c2e65252ce9287bcd57468b1a934197af894 Mon Sep 17 00:00:00 2001
From: Robob27 <robertgoodberry@robertgoodberry.com>
Date: Thu, 16 Feb 2023 02:56:52 -0500
Subject: [PATCH] Add key_back, rename switch_tab_key to key

---
 library/lua/gui/widgets.lua | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/library/lua/gui/widgets.lua b/library/lua/gui/widgets.lua
index 7276efefe..77c6c2c28 100644
--- a/library/lua/gui/widgets.lua
+++ b/library/lua/gui/widgets.lua
@@ -2188,7 +2188,8 @@ TabBar.ATTRS{
     active_tab_pens=DEFAULT_ACTIVE_TAB_PENS,
     inactive_tab_pens=DEFAULT_INACTIVE_TAB_PENS,
     get_pens=DEFAULT_NIL,
-    switch_tab_key=DEFAULT_NIL,
+    key=DEFAULT_NIL,
+    key_back=DEFAULT_NIL,
 }
 
 function TabBar:init()
@@ -2228,12 +2229,18 @@ end
 
 function TabBar:onInput(keys)
     if TabBar.super.onInput(self, keys) then return true end
-    if self.switch_tab_key and keys[self.switch_tab_key] then
+    if self.key and keys[self.key] then
         local zero_idx = self.get_cur_page() - 1
         local next_zero_idx = (zero_idx + 1) % #self.labels
         self.on_select(next_zero_idx + 1)
         return true
     end
+    if self.key_back and keys[self.key_back] then
+        local zero_idx = self.get_cur_page() - 1
+        local prev_zero_idx = (zero_idx - 1) % #self.labels
+        self.on_select(prev_zero_idx + 1)
+        return true
+    end
 end
 
 return _ENV