button: add the button widget

kivy/core/window/__init__.py

@@ -306,6 +306,7 @@ class WindowBase(EventDispatcher):
         from kivy.core.gl import *
         from kivy.graphics import GraphicContext
         from kivy.lib.transformations import clip_matrix
+
         context = GraphicContext.instance()
         context.set('projection_mat', clip_matrix(0, self.width, 0, self.height, -1, 1))
 

kivy/factory.py

@@ -63,6 +63,8 @@ class FactoryBase(object):
 
         return cls
 
+    get = __getattr__
+
 
 #: Factory instance to use for getting new classes
 Factory = FactoryBase()

kivy/factory_registers.py

@@ -26,3 +26,4 @@ Factory.register('TouchFactory', module='kivy.input.factory')
 Factory.register('TouchShape', module='kivy.input.shape')
 Factory.register('TouchShapeRect', module='kivy.input.shape')
 Factory.register('Widget', module='kivy.uix.widget')
+Factory.register('Button', module='kivy.uix.button')

kivy/uix/button.py

@@ -0,0 +1,40 @@
+'''
+Button: 
+'''
+
+__all__ = ('Button', )
+
+from kivy.uix.widget import Widget
+from kivy.c_ext.properties import OptionProperty
+
+class Button(Widget):
+
+    state = OptionProperty(['normal', 'down'])
+
+    def __init__(self, **kwargs):
+        super(Button, self).__init__(**kwargs)
+        self.register_event_type('on_press')
+        self.register_event_type('on_release')
+
+    def on_touch_down(self, touch):
+        if not self.collide_point(touch.x, touch.y):
+            return False
+        if self in touch.userdata:
+            return False
+        touch.grab(self)
+        touch.userdata[self] = True
+        self.state = 'down'
+        self.dispatch('on_press')
+        return True
+
+    def on_touch_move(self, touch):
+        return self in touch.userdata
+
+    def on_touch_up(self, touch):
+        if not self in touch.userdata:
+            return False
+        touch.ungrab(self)
+        self.state = 'normal'
+        self.dispatch('on_release')
+        return True
+