python - Drawing my own object on a layout: problem with subclassing gtk.drawable -


i want draw own object on layout, i'm trying subclass gdk.drawable, 

class link(gtk.gdk.drawable):   def __init__(self,comp1,comp2,layout):       super(link, self).__init__()       self.x1=comp1.xpos       self.y1=comp1.ypos       self.x2=comp2.xpos       self.y2=comp2.ypos       self.layout=layout

error:

cannot create instance of abstract (non-instantiable) type `gdkdrawable'

i can without subclassing drawable using layout.bin_window.draw_line() in method drawlink() of link object, i'm not able create custom graphic context gdk.gc each object , have use layout.get_style() same links! 

  def drawlink(self):     gc = self.layout.get_style().fg_gc[gtk.state_normal]     gc.line_style=gtk.gdk.line_on_off_dash     gc.line_width=6     self.layout.bin_window.draw_line(gc,self.x1, self.y1, self.x2, self.y2)

this reason want subclass drawable. if can use custom gc without subclassing drawable or(window, pixmap) great.

thanks

any alternative?

if understand correctly, want not subclassing gtk.gdk.drawable populating gtk.drawingarea widget own content. description of widget is:

the gtk.drawingarea widget used creating custom user interface elements. it's blank widget containing gtk.gdk.window can draw on.


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