Add support for hotkeys which trigger a sequence of functions

sloth/gui/labeltool.py

@@ -16,14 +16,12 @@ from sloth.conf import config
 from sloth.core.utils import import_callable
 from sloth.annotations.model import AnnotationTreeView, FrameModelItem, ImageFileModelItem
 from sloth import APP_NAME, ORGANIZATION_DOMAIN
+from sloth.utils.bind import bind, compose_noargs
 
 GUIDIR=os.path.join(os.path.dirname(__file__))
 
 LOG=logging.getLogger(__name__)
 
-def bind(function, labeltool):
-    return lambda: function(labeltool)
-
 class BackgroundLoader(QObject):
     finished = pyqtSignal()
 
@@ -165,7 +163,10 @@ class MainWindow(QMainWindow):
             hk = QAction(desc, self)
             hk.setShortcut(QKeySequence(key))
             hk.setEnabled(True)
-            hk.triggered.connect(bind(fun, self.labeltool))
+            if hasattr(fun, '__call__'):
+                hk.triggered.connect(bind(fun, self.labeltool))
+            else:
+                hk.triggered.connect(compose_noargs([bind(f, self.labeltool) for f in fun]))
             self.ui.menuShortcuts.addAction(hk)
             self.shortcuts.append(hk)
 

sloth/utils/bind.py

@@ -1,2 +1,14 @@
 def bind(fun, *args):
     return lambda: fun(*args)
+
+def compose_noargs(funs):
+    def tmp():
+        for f in funs:
+            f()
+    return tmp
+
+def compose(funs):
+    def tmp(*args, **kwargs):
+        for f in funs:
+            f(*args, **kwargs)
+    return tmp