From 3c1d2bd560300f3a90b244dbd65ec236599b3327 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 10 May 2015 18:09:12 +0530
Subject: [PATCH] Add keyboard shortcuts (Ctrl+Right, Ctrl+Left) to switch
 between virtual library tabs. Fixes #1453497 [[Enhancement] Shortcuts for
 cycling through virtual
 libraries](https://bugs.launchpad.net/calibre/+bug/1453497)

---
 manual/gui.rst           |  4 ++++
 src/calibre/gui2/init.py | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/manual/gui.rst b/manual/gui.rst
index 98b16ad47e..a4fd0eb7d0 100644
--- a/manual/gui.rst
+++ b/manual/gui.rst
@@ -704,6 +704,10 @@ Calibre has several keyboard shortcuts to save you time and mouse movement. Thes
       - Clear the additional restriction
     * - :kbd:`Ctrl+*`
       - Create a temporary virtual library based on the current search
+    * - :kbd:`Ctrl+Right`
+      - Select the next virtual library tab
+    * - :kbd:`Ctrl+Left`
+      - Select the previous virtua library tab
     * - :kbd:`N or F3`
       - Find the next book that matches the current search (only works if the highlight checkbox next to the search bar is checked)
     * - :kbd:`Shift+N or Shift+F3`
diff --git a/src/calibre/gui2/init.py b/src/calibre/gui2/init.py
index 715f524651..e6f1e30067 100644
--- a/src/calibre/gui2/init.py
+++ b/src/calibre/gui2/init.py
@@ -325,6 +325,25 @@ class VLTabs(QTabBar):  # {{{
         self.tabCloseRequested.connect(self.tab_close)
         self.setStyleSheet('QTabBar::tab:selected { font-weight: bold } QTabBar::tab { text-align: center }')
         self.setVisible(gprefs['show_vl_tabs'])
+        self.next_action = a = QAction(self)
+        a.triggered.connect(partial(self.next_tab, delta=1)), self.gui.addAction(a)
+        self.previous_action = a = QAction(self)
+        a.triggered.connect(partial(self.next_tab, delta=-1)), self.gui.addAction(a)
+        self.gui.keyboard.register_shortcut(
+            'virtual-library-tab-bar-next', _('Next virtual library'), action=self.next_action,
+            default_keys=('Ctrl+Right',),
+            description=_('Switch to the next Virtual Library in the Virtual Library tab bar')
+        )
+        self.gui.keyboard.register_shortcut(
+            'virtual-library-tab-bar-previous', _('Previous virtual library'), action=self.previous_action,
+            default_keys=('Ctrl+Left',),
+            description=_('Switch to the previous Virtual Library in the Virtual Library tab bar')
+        )
+
+    def next_tab(self, delta=1):
+        if self.count() > 1 and self.isVisible():
+            idx = (self.currentIndex() + delta) % self.count()
+            self.setCurrentIndex(idx)
 
     def enable_bar(self):
         gprefs['show_vl_tabs'] = True