Display in viewport without modal operation

Hello,
I want to display in the viewport property without using the modal operation. is it possible ? I found it, but I did not understand how I can use (I started with python)
Thank you


import bpy
import blf

class DrawingClass:
    def __init__(self, context, prop):
        self.prop = prop
        self.handle = bpy.types.SpaceView3D.draw_handler_add(
                   self.draw_text_callback,(context,),
                   'WINDOW', 'POST_PIXEL')

    def draw_text_callback(self, context):
        font_id = 0  # XXX, need to find out how best to get this.

        # draw some text
        blf.position(font_id, 15, 50, 0)
        blf.size(font_id, 20, 72)
        blf.draw(font_id, "%s %s" % (context.scene.name, self.prop))



    def remove_handle(self):
         bpy.types.SpaceView3D.draw_handler_remove(self.handle, 'WINDOW')

context = bpy.context             
dc = DrawingClass(context, "Draw This On Screen")

#dc.remove_handle()  # will remove the handle and stop drawing

http://blender.stackexchange.com/questions/40675/display-in-viewport-without-modal-operation/40676#40676

There is this template also here:
Blender\2.76\scripts emplates_py\operator_modal_draw.py

@const Think you’ll find operator_modal_draw does use modal operation