Merge pull request matplotlib#1034 from mdehoon/fix_for_issue_1013

MdH = allow compilation on recent Mac OS X without compiler warnings

Author: efiring

src/_macosx.m

@@ -355,7 +355,11 @@ - (void)masterCloses:(NSNotification*)notification;
 - (void)close;
 @end
 
+#ifdef COMPILING_FOR_10_6
+@interface View : NSView <NSWindowDelegate>
+#else
 @interface View : NSView
+#endif
 {   PyObject* canvas;
     NSRect rubberband;
     BOOL inside;
@@ -4244,14 +4248,22 @@ -(void)save_figure:(id)sender
     self->handler = [self->handler initWithToolbar: (PyObject*)self];
     for (i = 0; i < 9; i++)
     {
-        ScrollableButton* button;
+        NSButton* button;
         SEL scrollWheelUpAction = scroll_actions[i][0];
         SEL scrollWheelDownAction = scroll_actions[i][1];
-        if (scrollWheelUpAction || scrollWheelDownAction)
-            button = [ScrollableButton alloc];
+        if (scrollWheelUpAction && scrollWheelDownAction)
+        {
+            ScrollableButton* scrollable_button = [ScrollableButton alloc];
+            [scrollable_button initWithFrame: rect];
+            [scrollable_button setScrollWheelUpAction: scrollWheelUpAction];
+            [scrollable_button setScrollWheelDownAction: scrollWheelDownAction];
+            button = (NSButton*)scrollable_button;
+        }
         else
+        {
             button = [NSButton alloc];
-        [button initWithFrame: rect];
+            [button initWithFrame: rect];
+        }
         PyObject* imagedata = PyDict_GetItemString(images, imagenames[i]);
         NSImage* image = _read_ppm_image(imagedata);
         [button setBezelStyle: NSShadowlessSquareBezelStyle];
@@ -4264,10 +4276,6 @@ -(void)save_figure:(id)sender
         [button setToolTip: tooltips[i]];
         [button setTarget: self->handler];
         [button setAction: actions[i]];
-        if (scrollWheelUpAction)
-            [button setScrollWheelUpAction: scrollWheelUpAction];
-        if (scrollWheelDownAction)
-            [button setScrollWheelDownAction: scrollWheelDownAction];
         [[window contentView] addSubview: button];
         [button release];
         rect.origin.x += rect.size.width + smallgap;
@@ -4929,7 +4937,16 @@ -(void)save_figure:(id)sender
     [ns_default_filename release];
     if (result == NSOKButton)
     {
+#ifdef COMPILING_FOR_10_6
+        NSURL* url = [panel URL];
+        NSString* filename = [url path];
+        if (!filename) {
+            PyErr_SetString(PyExc_RuntimeError, "Failed to obtain filename");
+            return 0;
+        }
+#else
         NSString* filename = [panel filename];
+#endif
         unsigned int n = [filename length];
         unichar* buffer = malloc(n*sizeof(unichar));
         [filename getCharacters: buffer];