rework GUI frontend selection

[lilass.git] / gui.py

diff --git a/gui.py b/gui.py
index edb9b2b9a8086ceeeddb794986891cb6599df1fb..155226b3939fff4598786870baa61b3aedf13396 100644 (file)
--- a/gui.py
+++ b/gui.py
@@ -12,14 +12,42 @@
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program (gpl.txt); if not, write to the Free Software
+# along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 
-# This file bstracts GUI stuff away, so that the actual dsl.py does not have to deal with it
+# This file abstracts GUI stuff away, so that the actual dsl.py does not have to deal with it
 import sys
-from PyQt4 import QtGui
-app = QtGui.QApplication(sys.argv)
 
-def error(message):
-       QtGui.QMessageBox.critical(None, 'Fatal error', message)
-       raise Exception(message)
+# frontend detectors
+def qtAvailable():
+       try:
+               import PyQt4
+               return True
+       except ImportError:
+               return False
+
+def zenityAvailable():
+       return True # FIXME
+
+# actual frontend
+if qtAvailable():
+       from PyQt4 import QtGui
+       from qt_dialogue import PositionSelection
+       app = QtGui.QApplication(sys.argv)
+       
+       def error(message):
+               '''Displays a fatal error to the user'''
+               QtGui.QMessageBox.critical(None, 'Fatal error', message)
+       
+       def setup(internalResolutions, externalResolutions):
+               '''Returns a ScreenSetup instance, or None if the user canceled'''
+               return PositionSelection(internalResolutions, externalResolutions).run()
+elif zenityAvailable():
+       import subprocess
+       from zenity_dialogue import run as setup # this provides the setup function
+       
+       def error(message):
+               '''Displays a fatal error to the user'''
+               subprocess.check_call(["zenity", "--error", "--text="+message])
+else:
+       print >> sys.stderr, 'No GUI frontend available, please make sure PyQt4 or Zenity is installed'