Implement Fix #1298 (Deleting Cover Art from Metadata dialog)

src/calibre/gui2/dialogs/metadata_single.py

@@ -33,6 +33,11 @@ def __init__(self, parent, ext, size, path=None):
 
 class MetadataSingleDialog(QDialog, Ui_MetadataSingleDialog):
     
+    def do_reset_cover(self, *args):
+        pix = QPixmap(':/images/book.svg')
+        self.cover.setPixmap(pix)
+        self.cover_changed = True
+    
     def select_cover(self, checked):
         files = choose_images(self, 'change cover dialog', 
                              u'Choose cover for ' + qstring_to_unicode(self.title.text()))
@@ -149,6 +154,7 @@ def __init__(self, window, row, db, accepted_callback=None):
                         self.remove_unused_series)
         QObject.connect(self.auto_author_sort, SIGNAL('clicked()'),
                         self.deduce_author_sort)
+        self.connect(self.reset_cover, SIGNAL('clicked()'), self.do_reset_cover)
         self.connect(self.swap_button, SIGNAL('clicked()'), self.swap_title_author)
         self.timeout = float(prefs['network_timeout'])
         self.title.setText(db.title(row))

src/calibre/gui2/dialogs/metadata_single.ui

@@ -519,6 +519,20 @@
                 </property>
                </widget>
               </item>
+              <item>
+               <widget class="QToolButton" name="reset_cover" >
+                <property name="toolTip" >
+                 <string>Reset cover to default</string>
+                </property>
+                <property name="text" >
+                 <string>...</string>
+                </property>
+                <property name="icon" >
+                 <iconset resource="../images.qrc" >
+                  <normaloff>:/images/trash.svg</normaloff>:/images/trash.svg</iconset>
+                </property>
+               </widget>
+              </item>
              </layout>
             </item>
            </layout>