modalview: allow to close the modalview by hitting escape, if the auto_dismiss is allowed. closes #776

examples/demo/showcase/main.py

@@ -255,8 +255,7 @@ class ShowcaseApp(App):
         content.add_widget(Label(text='Hello world'))
         content.add_widget(btnclose)
         popup = Popup(content=content, title='Modal popup example',
-                      size_hint=(None, None), size=('300dp', '300dp'),
-                      auto_dismiss=False)
+                      size_hint=(None, None), size=('300dp', '300dp'))
         btnclose.bind(on_release=popup.dismiss)
         button = Button(text='Open popup', size_hint=(None, None),
                         size=('150sp', '70dp'),

kivy/uix/modalview.py

@@ -61,6 +61,12 @@ view from closing by explictly returning True from your callback ::
     view.bind(on_dismiss=my_callback)
     view.open()
 
+
+.. versionchanged:: 1.5.0
+
+    The ModalView can be closed by hitting escape key on the keyboard, if the
+    :data:`ModalView.auto_dismiss` is allowed.
+
 '''
 
 __all__ = ('ModalView', )
@@ -165,7 +171,9 @@ class ModalView(AnchorLayout):
             Logger.warning('ModalView: cannot open view, no window found.')
             return self
         self._window.add_widget(self)
-        self._window.bind(on_resize=self._align_center)
+        self._window.bind(
+            on_resize=self._align_center,
+            on_keyboard=self._handle_keyboard)
         self.center = self._window.center
         a = Animation(_anim_alpha=1., d=self._anim_duration)
         a.bind(on_complete=lambda *x: self.dispatch('on_open'))
@@ -227,7 +235,9 @@ class ModalView(AnchorLayout):
     def on__anim_alpha(self, instance, value):
         if value == 0 and self._window is not None:
             self._window.remove_widget(self)
-            self._window.unbind(on_resize=self._align_center)
+            self._window.unbind(
+                on_resize=self._align_center,
+                on_keyboard=self._handle_keyboard)
             self._window = None
 
     def on_open(self):
@@ -236,6 +246,11 @@ class ModalView(AnchorLayout):
     def on_dismiss(self):
         pass
 
+    def _handle_keyboard(self, window, key, *largs):
+        if key == 27 and self.auto_dismiss:
+            self.dismiss()
+            return True
+
 
 if __name__ == '__main__':
     from kivy.base import runTouchApp