Add entry to context menu for column headers to launch the Quickview dialog (for columns that support quick view)

src/calibre/gui2/actions/show_quickview.py

@@ -38,6 +38,13 @@ class ShowQuickviewAction(InterfaceAction):
                 Quickview(self.gui, self.gui.library_view, index)
             self.current_instance.show()
 
+    def change_quickview_column(self, idx):
+        self.show_quickview()
+        if self.current_instance:
+            if self.current_instance.is_closed:
+                return
+            self.current_instance.change_quickview_column.emit(idx)
+
     def library_changed(self, db):
         if self.current_instance and not self.current_instance.is_closed:
             self.current_instance.set_database(db)

src/calibre/gui2/dialogs/quickview.py

@@ -6,7 +6,7 @@ __docformat__ = 'restructuredtext en'
 
 from PyQt4.Qt import (Qt, QDialog, QAbstractItemView, QTableWidgetItem,
                       QListWidgetItem, QByteArray, QCoreApplication,
-                      QApplication)
+                      QApplication, pyqtSignal)
 
 from calibre.customize.ui import find_plugin
 from calibre.gui2 import gprefs
@@ -44,6 +44,8 @@ class TableItem(QTableWidgetItem):
 
 class Quickview(QDialog, Ui_Quickview):
 
+    change_quickview_column   = pyqtSignal(object)
+
     def __init__(self, gui, view, row):
         QDialog.__init__(self, gui, flags=Qt.Window)
         Ui_Quickview.__init__(self)
@@ -105,6 +107,7 @@ class Quickview(QDialog, Ui_Quickview):
         self.refresh(row)
 
         self.view.clicked.connect(self.slave)
+        self.change_quickview_column.connect(self.slave)
         QCoreApplication.instance().aboutToQuit.connect(self.save_state)
         self.search_button.clicked.connect(self.do_search)
         view.model().new_bookdisplay_data.connect(self.book_was_changed)
@@ -164,6 +167,8 @@ class Quickview(QDialog, Ui_Quickview):
 
         if vals:
             self.no_valid_items = False
+            if self.db.field_metadata[key]['datatype'] == 'rating':
+                vals = unicode(vals/2)
             if not isinstance(vals, list):
                 vals = [vals]
             vals.sort(key=sort_key)

src/calibre/gui2/library/views.py

@@ -197,6 +197,16 @@ class BooksView(QTableView): # {{{
         elif action.startswith('align_'):
             alignment = action.partition('_')[-1]
             self._model.change_alignment(column, alignment)
+        elif action == 'quickview':
+            from calibre.customize.ui import find_plugin
+            qv = find_plugin('Show Quickview')
+            if qv:
+                rows = self.selectionModel().selectedRows()
+                if len(rows) > 0:
+                    current_row = rows[0].row()
+                    current_col = self.column_map.index(column)
+                    index = self.model().index(current_row, current_col)
+                    qv.actual_plugin_.change_quickview_column(index)
 
         self.save_state()
 
@@ -240,7 +250,14 @@ class BooksView(QTableView): # {{{
                             a.setCheckable(True)
                             a.setChecked(True)
 
-
+            if self._model.db.field_metadata[col]['is_category']:
+                act = self.column_header_context_menu.addAction(_('Quickview column %s') %
+                        name,
+                    partial(self.column_header_context_handler, action='quickview',
+                        column=col))
+                rows = self.selectionModel().selectedRows()
+                if len(rows) > 1:
+                    act.setEnabled(False)
 
             hidden_cols = [self.column_map[i] for i in
                     range(self.column_header.count()) if