Added initial drawing code plus a test app.

jgui/events/events.py

@@ -0,0 +1,37 @@
+
+class Event(object):
+    def __init__(self, name='event', data=None):
+        self.name = name
+        self.data = data
+
+class EventSource(object):
+    types = [] # list of event names
+
+    def __init__(self):
+        super(EventSource, self).__init__()
+        self.events = {}
+        for type in self.types:
+            self.events[type] = []
+
+    def accept(self, event, callback):
+        if event in self.events:
+            if callback not in self.events[event]:
+                self.events[event].append(callback)
+
+    def dispatch(self, event, *args, **kwargs):
+        for callback in self.events[event]:
+            callback(*args, **kwargs)
+
+    def reject(self, event, callback):
+        if event in self.events:
+            if callback in self.events[event]:
+                self.events[event].remove(callback)
+
+class WindowEventSource(EventSource):
+    types = ['mouse-enter', 'mouse-leave',
+             'resize', 'move',
+             'key-repeat', 'key-down', 'key-up',
+             'mouse-right-down', 'mouse-right-up',
+             'mouse-left-down', 'mouse-left-up',
+             'mouse-middle-down', 'mouse-middle-up',
+             'scroll-up', 'scroll-down', 'drag']