Add function to provide elided text

Fixes: https://launchpad.net/bugs/1405260

openlp/core/ui/slidecontroller.py

@@ -43,6 +43,7 @@ from openlp.core.lib import OpenLPToolbar, ItemCapabilities, ServiceItem, ImageS
     ScreenList, build_icon, build_html
 from openlp.core.ui import HideMode, MainDisplay, Display, DisplayControllerType
 from openlp.core.lib.ui import create_action
+from openlp.core.utils import elide_text
 from openlp.core.utils.actions import ActionList, CategoryOrder
 from openlp.core.ui.listpreviewwidget import ListPreviewWidget
 
@@ -161,6 +162,7 @@ class SlideController(DisplayController, RegistryProperties):
         # Info label for the title of the current item, at the top of the slide controller
         self.info_label = QtGui.QLabel(self.panel)
         self.info_label.setAlignment(QtCore.Qt.AlignCenter)
+        self.info_label.setSizePolicy(QtGui.QSizePolicy.Ignored, QtGui.QSizePolicy.Preferred)
         self.panel_layout.addWidget(self.info_label)
         # Splitter
         self.splitter = QtGui.QSplitter(self.panel)
@@ -808,7 +810,8 @@ class SlideController(DisplayController, RegistryProperties):
         if service_item.is_command():
             Registry().execute(
                 '%s_start' % service_item.name.lower(), [self.service_item, self.is_live, self.hide_mode(), slide_no])
-        self.info_label.setText(self.service_item.title)
+        self.info_label.setText(elide_text(self.service_item.title, self.info_label.font(), self.info_label.width()))
+        self.info_label.setToolTip(self.service_item.title)
         self.slide_list = {}
         if self.is_live:
             self.song_menu.menu().clear()

openlp/core/utils/__init__.py

@@ -506,6 +506,17 @@ def get_natural_key(string):
         return [b''] + key
     return key
 
+def elide_text(text, font, width):
+    """
+    Add an ellipsis to text if it is wider than width.
+
+    :param text: The string to elide
+    :param font: The font that the text is being desplayed in
+    :param width: The width that the elided text string needs to fill
+    :return: The elided string or just text
+    """
+    font_metrics = QtGui.QFontMetrics(font)
+    return font_metrics.elidedText(text, QtCore.Qt.ElideRight, width)
 
 from .languagemanager import LanguageManager
 from .actions import ActionList