Add a keybinding to the Kivy textarea to render when ctrl-S is pressed.

examples/demo/kivycatalog/kivycatalog.kv

@@ -148,7 +148,7 @@
             id: bl
             orientation: "vertical"
             size_hint: .4, 1
-            TextInput:
+            KivyRenderTextInput:
                 text_size: self.width-20, self.height-20
                 font_name: "DroidSansMono.ttf"
                 valign: "top"

examples/demo/kivycatalog/main.py

@@ -1,4 +1,5 @@
 import os
+import sys
 from kivy.app import App
 from kivy.factory import Factory
 from kivy.lang import Builder, Parser, ParserException
@@ -7,6 +8,7 @@ from kivy.properties import ObjectProperty
 from kivy.uix.boxlayout import BoxLayout
 from kivy.uix.popup import Popup
 from kivy.uix.label import Label
+from kivy.uix.textinput import TextInput
 
 '''List of classes that need to be instantiated in the factory from .kv files.
 '''
@@ -53,6 +55,25 @@ for class_name in CONTAINER_CLASSES:
     globals()[class_name] = type(class_name, (Container,), {})
 
 
+@factoryable
+class KivyRenderTextInput(TextInput):
+    def _keyboard_on_key_down(self, window, keycode, text, modifiers):
+        is_osx = sys.platform == 'darwin'
+        # Keycodes on OSX:
+        ctrl, cmd = 64, 1024
+        key, key_str = keycode
+
+        if text and not key in (self.interesting_keys.keys() + [27]):
+            # This allows *either* ctrl *or* cmd, but not both.
+            if modifiers == ['ctrl'] or (is_osx and modifiers == ['meta']):
+                if key == ord('s'):
+                    self.parent.parent.parent.change_kv(True)
+                    return
+
+        super(KivyRenderTextInput, self)._keyboard_on_key_down(
+            window, keycode, text, modifiers)
+
+
 class Catalog(BoxLayout):
     '''Catalog of widgets. This is the root widget of the app. It contains
     a tabbed pain of widgets that can be displayed and a textbox where .kv