updated the set_default_header_footer method on lib/theme.py

all the works and the import is inside the method.

openlp/core/lib/theme.py

@@ -36,6 +36,7 @@ from lxml import etree, objectify
 
 from openlp.core.lib import str_to_bool
 
+
 log = logging.getLogger(__name__)
 
 BLANK_THEME_XML = \
@@ -444,12 +445,14 @@ class ThemeXML(object):
         element.appendChild(child)
         return child
 
-    def set_default_header_footer(self, current_screen):
+    def set_default_header_footer(self):
         """
         Set the header and footer size into the current primary screen
         """
         #10 px border set round display
-        self.font_main_y = 0;
+        from openlp.core.ui import ScreenList
+        current_screen = ScreenList.get_instance().current
+        self.font_main_y = 0
         self.font_main_width = current_screen[u'size'].width() - 20
         self.font_main_height = current_screen[u'size'].height() * 9 / 10
         self.font_footer_width = current_screen[u'size'].width() - 20

openlp/core/ui/thememanager.py

@@ -43,7 +43,7 @@ from openlp.core.lib.theme import ThemeXML, BackgroundType, VerticalType, \
 from openlp.core.lib.ui import UiStrings, critical_error_message_box, \
     create_widget_action
 from openlp.core.theme import Theme
-from openlp.core.ui import FileRenameForm, ThemeForm, ScreenList
+from openlp.core.ui import FileRenameForm, ThemeForm
 from openlp.core.utils import AppLocation, delete_file, get_filesystem_encoding
 
 log = logging.getLogger(__name__)
@@ -255,7 +255,7 @@ class ThemeManager(QtGui.QWidget):
         editing form for the user to make their customisations.
         """
         theme = ThemeXML()
-        theme.set_default_header_footer(ScreenList.get_instance().current)
+        theme.set_default_header_footer()
         self.themeForm.theme = theme
         self.themeForm.exec_()