Hi, everyone.
I was using gnome-python pre2.0 for some time, with great success.
Unfortunately things seem to have changed for gnome-python 2.0 and now
my programs don't run.
I've already done the various conversions needed to support modules
moving around and being renamed. What I'm now stuck on is trying to add
a line to a gnome canvas object. I get an incomprehensible error, and
I've no way to determine what's wrong.
I've attached the program. The problem is in the call to 'build' within
the WorldObject. The first add() statement dies like this:
(tinydemo.py:5601): GnomeCanvas-CRITICAL **: file gnome-canvas.c: line
198 (gnome_canvas_item_new): assertion `g_type_is_a (type,
gnome_canvas_item_get_type ())' failed
Traceback (most recent call last):
File "./tinydemo.py", line 106, in ?
st.populate()
File "./tinydemo.py", line 89, in populate
self.element = WorldObject(self.canvas,200,200)
File "./tinydemo.py", line 16, in __init__
self.build()
File "./tinydemo.py", line 67, in build
fill_color='darkgrey')
RuntimeError: could not create canvas item object
Can anyone either shed some light, or point me to some documentation to
show how to add canvas objects in 2.0? I originally wrote this based on
the gnome-python example, but I can't find a 2.0 equivalent of that
example.
I've attached my program for reference.
Thanks in advance!
cf
#!/usr/bin/env python
import gtk, gtk.gdk, gnome.ui, gnome.canvas
class WorldObject:
def __init__(self,canvas,x,y):
self.myobj = None
self.myline = None
self.mylinepoints = [x,y,x,y]
self.canvas = canvas
self.width = 20
self.height = 20
self.x = x
self.y = y
self.lmb_pressed = 0
self.build()
def set_line_endpoint(self,x,y):
self.mylinepoints[0] = x
self.mylinepoints[1] = y
self.myline.set(points=self.mylinepoints)
def item_event(self, widget, event=None):
if event.type == gtk.gdk.BUTTON_RELEASE:
if event.button == 1:
self.lmb_pressed = 0
self.myline.hide()
return gtk.TRUE
elif event.type == gtk.gdk.BUTTON_PRESS:
if event.button == 1:
self.lmb_pressed = 1
self.set_line_endpoint(event.x,event.y)
self.myline.show()
return gtk.TRUE
elif event.type == gtk.gdk.MOTION_NOTIFY:
if event.state & gtk.gdk.BUTTON1_MASK:
self.set_line_endpoint(event.x, event.y)
return gtk.TRUE
elif event.type == gtk.gdk.ENTER_NOTIFY:
# Make the outline wide, show the arrow
widget.set(width_units=3, fill_color="cyan")
self.myline.show()
return gtk.TRUE
elif event.type == gtk.gdk.LEAVE_NOTIFY:
# Make the outline thin, hide the arrow
widget.set(width_units=1, fill_color="blue")
if self.lmb_pressed == 0:
self.myline.hide()
return gtk.TRUE
return gtk.FALSE
def build(self):
self.myline = self.canvas.root().add('line',
points=self.mylinepoints,
width_units=1.0,
line_style=gtk.gdk.LINE_ON_OFF_DASH,
arrow_shape_a=10.0,
arrow_shape_b=15.0,
arrow_shape_c=5.0,
first_arrowhead=gtk.TRUE,
last_arrowhead=gtk.FALSE,
fill_color='darkgrey')
self.myobj = self.canvas.root().add('ellipse',
x1=self.x-(self.width/2),
y1=self.y-(self.height/2),
x2=self.x+(self.width/2),
y2=self.y+(self.height/2),
fill_color='blue', outline_color='black',
width_units=1.0)
self.myline.hide()
self.myobj.show()
self.myobj.connect("event",self.item_event)
class SimpleTest:
def __init__(self):
self.width = 400
self.height = 400
self.canvas = None
def populate(self):
self.element = WorldObject(self.canvas,200,200)
def open_window(self):
win = gtk.Window(gtk.WINDOW_TOPLEVEL)
win.connect('destroy', gtk.mainquit)
win.set_title('Simple Example')
self.canvas = gnome.canvas.Canvas()
self.canvas.set_size_request(self.width, self.height)
self.canvas.set_scroll_region(0,0, self.width, self.height)
win.add(self.canvas)
self.canvas.show()
win.show()
if __name__ == '__main__':
st = SimpleTest()
st.open_window()
st.populate()
gtk.mainloop()
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