Implement close_event in the Mac OS X native backend.

svn path=/trunk/matplotlib/; revision=8762

Author: mdehoon

src/_macosx.m

@@ -346,6 +346,7 @@ - (void)drawRect:(NSRect)rect;
 - (void)windowDidResize:(NSNotification*)notification;
 - (View*)initWithFrame:(NSRect)rect;
 - (void)setCanvas: (PyObject*)newCanvas;
+- (void)windowWillClose:(NSNotification*)notification;
 - (BOOL)windowShouldClose:(NSNotification*)notification;
 - (BOOL)isFlipped;
 - (void)mouseEntered:(NSEvent*)event;
@@ -4935,6 +4936,20 @@ - (void)windowDidResize: (NSNotification*)notification
     [self setNeedsDisplay: YES];
 }
 
+- (void)windowWillClose:(NSNotification*)notification
+{
+    PyGILState_STATE gstate;
+    PyObject* result;
+
+    gstate = PyGILState_Ensure();
+    result = PyObject_CallMethod(canvas, "close_event", "");
+    if(result)
+        Py_DECREF(result);
+    else
+        PyErr_Print();
+    PyGILState_Release(gstate);
+}
+
 - (BOOL)windowShouldClose:(NSNotification*)notification
 {
     NSWindow* window = [self window];