Pie Menus C code backend.

This commit merges the code in the pie-menu branch.

As per decisions taken the last few days, there are no pie menus
included and there will be an official add-on including overrides of
some keys with pie menus. However, people will now be able to use the
new code in python.

Full Documentation is in http://wiki.blender.org/index.php/Dev:Ref/

Thanks:
Campbell Barton, Dalai Felinto and Ton Roosendaal for the code review
and design comments

Jonathan Williamson, Pawel Lyczkowski, Pablo Vazquez among others for
suggestions during the development.

Special Thanks to Sean Olson, for his support, suggestions, testing and
merciless bugging so that I would finish the pie menu code. Without him
we wouldn't be here. Also to the rest of the developers of the original
python add-on, Patrick Moore and Dan Eicher and finally to Matt Ebb, who
did the research and first implementation and whose code I used to get
started.

release/scripts/modules/bpy_types.py

@@ -140,6 +140,15 @@ class WindowManager(bpy_types.ID):
         finally:
             self.pupmenu_end__internal(popup)
 
+    def popup_menu_pie(self, event, draw_func, title="", icon='NONE'):
+        import bpy
+        pie = self.piemenu_begin__internal(title, icon, event)
+
+        try:
+            draw_func(pie, bpy.context)
+        finally:
+            self.piemenu_end__internal(pie)
+
 
 class _GenericBone:
     """

release/scripts/startup/bl_operators/wm.py

@@ -527,7 +527,33 @@ class WM_OT_context_menu_enum(Operator):
 
         context.window_manager.popup_menu(draw_func=draw_cb, title=prop.name, icon=prop.icon)
 
-        return {'PASS_THROUGH'}
+        return {'FINISHED'}
+
+
+class WM_OT_context_pie_enum(Operator):
+    bl_idname = "wm.context_pie_enum"
+    bl_label = "Context Enum Pie"
+    bl_options = {'UNDO', 'INTERNAL'}
+    data_path = rna_path_prop
+
+    def invoke(self, context, event):
+        data_path = self.data_path
+        value = context_path_validate(context, data_path)
+
+        if value is Ellipsis:
+            return {'PASS_THROUGH'}
+
+        base_path, prop_string = data_path.rsplit(".", 1)
+        value_base = context_path_validate(context, base_path)
+        prop = value_base.bl_rna.properties[prop_string]
+
+        def draw_cb(self, context):
+            layout = self.layout
+            layout.prop(value_base, prop_string, expand=True)
+
+        context.window_manager.popup_menu_pie(draw_func=draw_cb, title=prop.name, icon=prop.icon, event=event)
+
+        return {'FINISHED'}
 
 
 class WM_OT_context_set_id(Operator):

release/scripts/startup/bl_ui/space_userpref.py

@@ -216,6 +216,13 @@ class USERPREF_PT_interface(Panel):
         sub.prop(view, "open_toplevel_delay", text="Top Level")
         sub.prop(view, "open_sublevel_delay", text="Sub Level")
 
+        col.separator()
+        col.label(text="Pie Menus:")
+        sub = col.column(align=True)
+        sub.prop(view, "pie_animation_timeout")
+        sub.prop(view, "pie_initial_timeout")
+        sub.prop(view, "pie_menu_radius")
+        sub.prop(view, "pie_menu_threshold")
         col.separator()
         col.separator()
         col.separator()
@@ -681,6 +688,9 @@ class USERPREF_PT_theme(Panel):
             col.label(text="Menu:")
             self._theme_widget_style(col, ui.wcol_menu)
 
+            col.label(text="Pie Menu:")
+            self._theme_widget_style(col, ui.wcol_pie_menu)
+
             col.label(text="Pulldown:")
             self._theme_widget_style(col, ui.wcol_pulldown)
 

release/scripts/templates_py/ui_pie_menu.py

@@ -0,0 +1,32 @@
+import bpy
+from bpy.types import Menu
+
+# spawn an edit mode selection pie (run while object is in edit mode to get a valid output)
+
+
+class VIEW3D_PIE_template(Menu):
+    # label is displayed at the center of the pie menu.
+    bl_label = "Select Mode"
+
+    def draw(self, context):
+        layout = self.layout
+
+        pie = layout.menu_pie()
+        # operator_enum will just spread all available options
+        # for the type enum of the operator on the pie
+        pie.operator_enum("mesh.select_mode", "type")
+
+
+def register():
+    bpy.utils.register_class(VIEW3D_PIE_template)
+
+
+def unregister():
+    bpy.utils.unregister_class(VIEW3D_PIE_template)
+
+
+if __name__ == "__main__":
+    register()
+
+    bpy.ops.wm.call_menu_pie(name="VIEW3D_PIE_template")
+