Quickview: add a "Refresh" action that is enabled when QV is locked.

src/calibre/gui2/actions/show_quickview.py

@@ -87,6 +87,15 @@ class ShowQuickviewAction(InterfaceAction):
                      group=self.action_spec[0])
         self.focus_bl_action.triggered.connect(self.focus_booklist)
 
+        self.focus_refresh_action = QAction(self.gui)
+        self.gui.addAction(self.focus_refresh_action)
+        self.gui.keyboard.register_shortcut('Refresh from Quickview',
+                     _('Refresh Quickview'),
+                     description=_('Refresh the information shown in the Quickview pane'),
+                     action=self.focus_refresh_action,
+                     group=self.action_spec[0])
+        self.focus_refresh_action.triggered.connect(self.refill_quickview)
+
         self.search_action = QAction(self.gui)
         self.gui.addAction(self.search_action)
         self.gui.keyboard.register_shortcut('Search from Quickview', _('Search from Quickview'),
@@ -96,6 +105,7 @@ class ShowQuickviewAction(InterfaceAction):
         self.search_action.triggered.connect(self.search_quickview)
         self.search_action.changed.connect(self.set_search_shortcut)
         self.menuless_qaction.changed.connect(self.set_search_shortcut)
+
         self.qv_button = QuickviewButton(self.gui, self)
 
     def initialization_complete(self):

src/calibre/gui2/dialogs/quickview.py

@@ -193,9 +193,11 @@ class Quickview(QDialog, Ui_Quickview):
         self.books_table.installEventFilter(focus_filter)
 
         self.close_button.clicked.connect(self.close_button_clicked)
+        self.refresh_button.clicked.connect(self.refill)
 
         self.tab_order_widgets = [self.items, self.books_table, self.lock_qv,
-                          self.dock_button, self.search_button, self.close_button]
+                          self.dock_button, self.search_button, self.refresh_button,
+                          self.close_button]
         for idx,widget in enumerate(self.tab_order_widgets):
             widget.installEventFilter(WidgetTabFilter(widget, idx, self.tab_pressed_signal))
 
@@ -239,8 +241,10 @@ class Quickview(QDialog, Ui_Quickview):
             self.dock_button.setText(_('Undock'))
             self.dock_button.setToolTip(_('Pop up the quickview panel into its own floating window'))
             self.dock_button.setIcon(QIcon(I('arrow-up.png')))
+            # Remove the ampersands from the buttons because shortcuts exist.
             self.lock_qv.setText(_('Lock Quickview contents'))
             self.search_button.setText(_('Search'))
+            self.refresh_button.setText(_('Refresh'))
             self.gui.quickview_splitter.add_quickview_dialog(self)
             self.close_button.setVisible(False)
         else:
@@ -252,6 +256,13 @@ class Quickview(QDialog, Ui_Quickview):
         self.dock_button.clicked.connect(self.show_as_pane_changed)
         self.gui.search.cleared.connect(self.indicate_no_items)
 
+        # Enable the refresh button only when QV is locked
+        self.refresh_button.setEnabled(False)
+        self.lock_qv.stateChanged.connect(self.lock_qv_changed)
+
+    def lock_qv_changed(self, state):
+        self.refresh_button.setEnabled(state)
+
     def add_columns_to_widget(self):
         '''
         Get the list of columns from the preferences. Clear the current table

src/calibre/gui2/dialogs/quickview.ui

@@ -148,6 +148,32 @@
        </property>
       </spacer>
      </item>
+     <item>
+      <widget class="QPushButton" name="refresh_button">
+       <property name="text">
+        <string>&amp;Refresh</string>
+       </property>
+       <property name="toolTip">
+        <string>When Quickview is locked, refresh the window using the last selected book and that book's value in the last selected column.</string>
+       </property>
+       <property name="autoDefault">
+        <bool>false</bool>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer>
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>0</width>
+         <height>0</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
      <item>
       <widget class="QPushButton" name="close_button">
        <property name="text">