Book details panel: ALlow right clicking on a format to delete it.

src/calibre/gui2/actions/delete.py

@@ -139,6 +139,21 @@ class DeleteAction(InterfaceAction):
             return set([])
         return set(map(self.gui.library_view.model().id, rows))
 
+    def remove_format_by_id(self, book_id, fmt):
+        title = self.gui.current_db.title(book_id, index_is_id=True)
+        if not confirm('<p>'+(_(
+            'The %(fmt)s format will be <b>permanently deleted</b> from '
+            '%(title)s. Are you sure?')%dict(fmt=fmt, title=title))
+                            +'</p>', 'library_delete_specific_format', self.gui):
+            return
+
+        self.gui.library_view.model().db.remove_format(book_id, fmt,
+                index_is_id=True, notify=False)
+        self.gui.library_view.model().refresh_ids([book_id])
+        self.gui.library_view.model().current_changed(self.gui.library_view.currentIndex(),
+                self.gui.library_view.currentIndex())
+        self.gui.tags_view.recount()
+
     def delete_selected_formats(self, *args):
         ids = self._get_selected_ids()
         if not ids:

src/calibre/gui2/book_details.py

@@ -5,8 +5,8 @@ __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
 
-from PyQt4.Qt import (QPixmap, QSize, QWidget, Qt, pyqtSignal, QUrl,
-    QPropertyAnimation, QEasingCurve, QApplication, QFontInfo,
+from PyQt4.Qt import (QPixmap, QSize, QWidget, Qt, pyqtSignal, QUrl, QIcon,
+    QPropertyAnimation, QEasingCurve, QApplication, QFontInfo, QAction,
     QSizePolicy, QPainter, QRect, pyqtProperty, QLayout, QPalette, QMenu)
 from PyQt4.QtWebKit import QWebView
 
@@ -382,6 +382,7 @@ class CoverView(QWidget): # {{{
 class BookInfo(QWebView):
 
     link_clicked = pyqtSignal(object)
+    remove_format = pyqtSignal(int, object)
 
     def __init__(self, vertical, parent=None):
         QWebView.__init__(self, parent)
@@ -395,6 +396,16 @@ class BookInfo(QWebView):
         palette.setBrush(QPalette.Base, Qt.transparent)
         self.page().setPalette(palette)
         self.css = P('templates/book_details.css', data=True).decode('utf-8')
+        self.remove_format_action = QAction(QIcon(I('trash.png')),
+                '', self)
+        self.remove_format_action.current_fmt = None
+        self.remove_format_action.triggered.connect(self.remove_format_triggerred)
+
+    def remove_format_triggerred(self):
+        f = self.remove_format_action.current_fmt
+        if f:
+            book_id, fmt = f
+            self.remove_format.emit(book_id, fmt)
 
     def link_activated(self, link):
         self._link_clicked = True
@@ -420,6 +431,32 @@ class BookInfo(QWebView):
         else:
             ev.ignore()
 
+    def contextMenuEvent(self, ev):
+        p = self.page()
+        mf = p.mainFrame()
+        r = mf.hitTestContent(ev.pos())
+        url = unicode(r.linkUrl().toString()).strip()
+        menu = p.createStandardContextMenu()
+        ca = self.pageAction(p.Copy)
+        for action in list(menu.actions()):
+            if action is not ca:
+                menu.removeAction(action)
+        if not r.isNull() and url.startswith('format:'):
+            parts = url.split(':')
+            try:
+                book_id, fmt = int(parts[1]), parts[2]
+            except:
+                import traceback
+                traceback.print_exc()
+            else:
+                self.remove_format_action.current_fmt = (book_id, fmt)
+                self.remove_format_action.setText(_('Delete the %s format')%parts[
+                    2])
+                menu.addAction(self.remove_format_action)
+        if len(menu.actions()) > 0:
+            menu.exec_(ev.globalPos())
+
+
 # }}}
 
 class DetailsLayout(QLayout): # {{{
@@ -513,6 +550,7 @@ class BookDetails(QWidget): # {{{
     show_book_info = pyqtSignal()
     open_containing_folder = pyqtSignal(int)
     view_specific_format = pyqtSignal(int, object)
+    remove_specific_format = pyqtSignal(int, object)
     remote_file_dropped = pyqtSignal(object, object)
     files_dropped = pyqtSignal(object, object)
     cover_changed = pyqtSignal(object, object)
@@ -579,6 +617,7 @@ class BookDetails(QWidget): # {{{
         self.book_info = BookInfo(vertical, self)
         self._layout.addWidget(self.book_info)
         self.book_info.link_clicked.connect(self.handle_click)
+        self.book_info.remove_format.connect(self.remove_specific_format)
         self.setCursor(Qt.PointingHandCursor)
 
     def handle_click(self, link):

src/calibre/gui2/init.py

@@ -265,6 +265,8 @@ class LayoutMixin(object): # {{{
                 type=Qt.QueuedConnection)
         self.book_details.open_containing_folder.connect(self.iactions['View'].view_folder_for_id)
         self.book_details.view_specific_format.connect(self.iactions['View'].view_format_by_id)
+        self.book_details.remove_specific_format.connect(
+                self.iactions['Remove Books'].remove_format_by_id)
 
         m = self.library_view.model()
         if m.rowCount(None) > 0: