- '''Returns a ScreenSetup instance, or None if the user canceled'''
- if qt_available:
- return PositionSelection(internalResolutions, externalResolutions).run()
- else:
- return zenity_run(internalResolutions, externalResolutions)
+ Both arguments are lists of (width, height) tuples of resolutions. You can use dsl.res2user to obtain a user-readable representation of a resolution tuple.
+ The user should be asked about his display setup preferences.
+ The function returns None if the user cancelled, and an instance of dsl.ScreenSetup otherwise.
+'''
+import collections
+
+from qt_frontend import QtFrontend
+from cli_frontend import CLIFrontend
+from zenity_frontend import ZenityFrontend
+
+
+# list of available frontends
+frontends = collections.OrderedDict()
+frontends["qt"] = QtFrontend
+frontends["zenity"] = ZenityFrontend
+frontends["cli"] = CLIFrontend
+
+# get a frontend
+def getFrontend(name = None):
+ # by name
+ if name is not None:
+ if name in frontends:
+ if frontends[name].isAvailable():
+ return frontends[name]() # call constructor
+ else:
+ raise Exception("Frontend %s not available" % name)
+ # frontend not found
+ raise Exception("Frontend %s not found" % name)
+ # auto-detect
+ for frontend in frontends.values():
+ if frontend.isAvailable():
+ return frontend() # call constructor
+ raise Exception("No frontend is available - this should not happen")