How do you display a tool tip for a custom modal operator? I've got a modal operator in my add-on that allows the user to draw a gradient. I'd really like to show the user more information about an axis snap feature the operator has, but I'm not sure how best to do this. From looking at other operators, such as vertex slide, the Blender way is to show a tool tip in the bar at the bottom of the screen, as shown in this image.



How do I do this?
Area.header_text_set

A call to area.header_text_set(text) sets the header text to text No argument area.header_text_set() and  it returns header to usual mode (menus et al).

Code below from Scripting &gt; Templates &gt; Python &gt; operator_modal_view3d.py 

    if event.type == 'MOUSEMOVE':
        self.offset = (self._initial_mouse - Vector((event.mouse_x, event.mouse_y, 0.0))) * 0.02
        self.execute(context)
        context.area.header_text_set("Offset %.4f %.4f %.4f" % tuple(self.offset))

    elif event.type == 'LEFTMOUSE':
        context.area.header_text_set()
        return {'FINISHED'}