Ajout du GUI

kivy/effects/opacityscroll.py

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+'''
+Opacity scroll effect
+=====================
+
+Based on the :class:`~kivy.effects.damped.DampedScrollEffect`, this one will
+also decrease the opacity of the target widget during the overscroll.
+
+'''
+
+__all__ = ('OpacityScrollEffect', )
+
+
+from kivy.effects.dampedscroll import DampedScrollEffect
+
+
+class OpacityScrollEffect(DampedScrollEffect):
+    '''OpacityScrollEffect class. Uses the overscroll
+    information to reduce the opacity of the scrollview widget. When the user
+    stops the drag, the opacity is set back to 1.
+    '''
+
+    def on_overscroll(self, *args):
+        if self.target_widget and self.target_widget.height != 0:
+            alpha = (1.0 -
+                     abs(self.overscroll / float(self.target_widget.height)))
+            self.target_widget.opacity = min(1, alpha)
+        self.trigger_velocity_update()