Add a right click menu to the cover browser. It allows you to view a book, edit metadata etc. from withing the cover browser. The menu can be customized in Preferences->Toolbars

src/calibre/gui2/__init__.py

@@ -74,6 +74,13 @@ gprefs.defaults['action-layout-context-menu-device'] = (
         'Add To Library', 'Edit Collections',
         )
 
+gprefs.defaults['action-layout-context-menu-cover-browser'] = (
+        'Edit Metadata', 'Send To Device', 'Save To Disk',
+        'Connect Share', 'Copy To Library', None,
+        'Convert Books', 'View', 'Open Folder', 'Show Book Details',
+        'Similar Books', 'Tweak ePub', None, 'Remove Books',
+        )
+
 gprefs.defaults['show_splash_screen'] = True
 gprefs.defaults['toolbar_icon_size'] = 'medium'
 gprefs.defaults['automerge'] = 'ignore'

src/calibre/gui2/cover_flow.py

@@ -9,8 +9,8 @@ Module to implement the Cover Flow feature
 
 import sys, os, time
 
-from PyQt4.Qt import QImage, QSizePolicy, QTimer, QDialog, Qt, QSize, \
+from PyQt4.Qt import (QImage, QSizePolicy, QTimer, QDialog, Qt, QSize,
-        QStackedLayout, QLabel, QByteArray, pyqtSignal
+        QStackedLayout, QLabel, QByteArray, pyqtSignal)
 
 from calibre import plugins
 from calibre.gui2 import config, available_height, available_width, gprefs
@@ -84,6 +84,7 @@ if pictureflow is not None:
     class CoverFlow(pictureflow.PictureFlow):
 
         dc_signal = pyqtSignal()
+        context_menu_requested = pyqtSignal()
 
         def __init__(self, parent=None):
             pictureflow.PictureFlow.__init__(self, parent,
@@ -94,6 +95,17 @@ if pictureflow is not None:
                 QSizePolicy.Expanding))
             self.dc_signal.connect(self._data_changed,
                     type=Qt.QueuedConnection)
+            self.context_menu = None
+            self.setContextMenuPolicy(Qt.DefaultContextMenu)
+
+        def set_context_menu(self, cm):
+            self.context_menu = cm
+
+        def contextMenuEvent(self, event):
+            if self.context_menu is not None:
+                self.context_menu_requested.emit()
+                self.context_menu.popup(event.globalPos())
+                event.accept()
 
         def sizeHint(self):
             return self.minimumSize()
@@ -149,6 +161,7 @@ class CoverFlowMixin(object):
             self.cover_flow_sync_flag = True
             self.cover_flow = CoverFlow(parent=self)
             self.cover_flow.currentChanged.connect(self.sync_listview_to_cf)
+            self.cover_flow.context_menu_requested.connect(self.cf_context_menu_requested)
             self.library_view.selectionModel().currentRowChanged.connect(
                     self.sync_cf_to_listview)
             self.db_images = DatabaseImages(self.library_view.model())
@@ -234,6 +247,14 @@ class CoverFlowMixin(object):
             self.cover_flow.setCurrentSlide(current.row())
         self.cover_flow_sync_flag = True
 
+    def cf_context_menu_requested(self):
+        row = self.cover_flow.currentSlide()
+        m = self.library_view.model()
+        index = m.index(row, 0)
+        sm = self.library_view.selectionModel()
+        sm.select(index, sm.ClearAndSelect|sm.Rows)
+        self.library_view.setCurrentIndex(index)
+
     def cover_flow_do_sync(self):
         self.cover_flow_sync_flag = True
         try:

src/calibre/gui2/init.py

@@ -62,7 +62,6 @@ class LibraryViewMixin(object): # {{{
             view = getattr(self, view+'_view')
             view.verticalHeader().sectionDoubleClicked.connect(self.iactions['View'].view_specific_book)
 
-        self.build_context_menus()
         self.library_view.model().set_highlight_only(config['highlight_search_matches'])
 
     def build_context_menus(self):
@@ -81,6 +80,11 @@ class LibraryViewMixin(object): # {{{
         for v in (self.memory_view, self.card_a_view, self.card_b_view):
             v.set_context_menu(dm, ec)
 
+        if self.cover_flow is not None:
+            cm = QMenu(self.cover_flow)
+            populate_menu(cm,
+                    gprefs['action-layout-context-menu-cover-browser'])
+            self.cover_flow.set_context_menu(cm)
 
     def search_done(self, view, ok):
         if view is self.current_view():

src/calibre/gui2/pictureflow/pictureflow.cpp

@@ -1332,6 +1332,7 @@ void PictureFlow::mousePressEvent(QMouseEvent* event)
 
 void PictureFlow::mouseReleaseEvent(QMouseEvent* event)
 {
+  bool accepted = false;
   int sideWidth = (d->buffer.width() - slideSize().width()) /2;
 
   if (d->singlePress)
@@ -1339,14 +1340,21 @@ void PictureFlow::mouseReleaseEvent(QMouseEvent* event)
     if (event->x() < sideWidth )
     {
       showPrevious();
+      accepted = true;
     } else if ( event->x() > sideWidth + slideSize().width() ) {
       showNext();
+      accepted = true;
     } else {
+        if (event->button() == Qt::LeftButton) {
               emit itemActivated(d->getTarget());
+              accepted = true;
+        }
     }
 
+    if (accepted) {
         event->accept();
     }
+  }
 
   emit inputReceived();
 }

src/calibre/gui2/preferences/toolbar.py

@@ -225,6 +225,8 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
                 'calibre library')),
             ('context-menu-device', _('The context menu for the books on '
                 'the device')),
+            ('context-menu-cover-browser', _('The context menu for the cover '
+                'browser')),
             ]
 
     def genesis(self, gui):

src/calibre/gui2/ui.py

@@ -308,6 +308,8 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, EmailMixin, # {{{
                 self.height())
         self.resize(self.width(), self._calculated_available_height)
 
+        self.build_context_menus()
+
         for ac in self.iactions.values():
             try:
                 ac.gui_layout_complete()