Re: CustomItem not displaying on mouse click

[Shashank Bandari <mail shashank-bandari in>]

On 12/22/2010 05:44 PM, Damon Chaplin wrote:

On Wed, 2010-12-22 at 09:01 +0000, Shashank Bandari wrote:

Hi,
 I am trying to use a custom item to draw objects onto the canvas on a 
mouse click. The item is not displayed on mouse click.
However if I minimise the window and then maximise, the item is 
displayed. The code is shown below.

#!/usr/bin/env python
import sys
import pygtk
import string

pygtk.require('2.0')
import gtk
import gobject
import gtk.glade
import goocanvas
import cairo
import os.path

from Objects import GeneratorItem

class MainWindow:
 def __init__(self):
   self.edit_state=0
   self.builder = gtk.Builder()
   self.builder.add_from_file("sample_glade.glade")
   self.window=self.builder.get_object("sample_window")
   self.canvas_window=self.builder.get_object("main_canvas") #Scrolled 
Window
   self.canvas=goocanvas.Canvas()
   self.canvas_window.add(self.canvas)
   self.window.show_all()
   
self.canvas.connect("button_release_event",self.canvas_mouse_up,None)

 def canvas_mouse_up(self,item,event,cr):
   root = self.canvas.get_root_item()
   item = GeneratorItem.GeneratorItem(x=100, y=100, width=100, 
height=100,line_width=20)
   root.add_child(item)
   self.canvas.request_update()
   self.canvas_window.show_all()

window=MainWindow()
gtk.main()

GeneratorItem is the sample CustomRectItem from the demos directory.

Kindly suggest the points I am missing in the code.

It looks like it should work.

Does the item display correctly if you add it when you create the
canvas?

Are you sure canvas_mouse_up() is being called?

Damon


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Hi Damon,
    I have checked it by adding a print statement in the canvas_move_up() function and it is being called on mouse release event. The sample code along with the glade file is attached for further reference. The issue is that I can see the item on canvas if I minimize and then maximize the window.


--
Shashank Bandari

Attachment: sample.tar
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