[pygtk] problem with moving too many gtk.Images inside a gtk.Layout

[Victor Matheus]

hello, i'm trying to make a simple canvas, where i can move images by
dragging them with the mouse, i don't want to use the drag'n'drop functions
because i want to know when there were collisions between the images, so i
did it with the usual events 'motion-notify-event','button-press-event' and
'release-press-event'. but when there are too many images in the screen, the
position of the mouse given by motion-notify-event is wrong and the images
shakes...

do somebody know how can i solve this problem?

here is a example of the problem, see by yourself:

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import gtk

class img( gtk.Image ):

    #list with all images
    list =3D []

    def __init__(self, image, layout, img_to_follow):
        gtk.Image.__init__(self)

    self.drag =3D False
        self.drag_x =3D 0
        self.drag_y =3D 0

        self.layout =3D layout

    #position of the image in the layout
        self.x =3D 0
        self.y =3D 0

        self.set_from_file( image )

        self.event_box =3D gtk.EventBox()
        self.event_box.set_visible_window( False )
        self.event_box.add( self )

    #images cannot have these events....
        self.event_box.add_events( gtk.gdk.POINTER_MOTION_MASK |
gtk.gdk.BUTTON_PRESS_MASK | gtk.gdk.BUTTON_RELEASE_MASK )
        self.event_box.connect("button-press-event", self.click)
        self.event_box.connect("button-release-event", self.release)
        self.event_box.connect("motion-notify-event", self.mousemove)

        if img_to_follow:
            self.img_to_follow =3D img_to_follow
            self.follow =3D True
        else:
            self.follow =3D False

        self.layout.put( self.event_box, 0, 0 )
        self.list.append( self )

    def click(self, widget, event):
    #drag begin
        self.drag =3D True
        self.drag_x =3D event.x
        self.drag_y =3D event.y

    def release(self, widget, event):
        self.drag =3D False

    def mousemove(self, widget, event):
        if self.drag:

            for k in self.list:
                if k.follow =3D=3D False:
            #follow
                    self.layout.move( k.event_box, k.x+int(
event.x-self.drag_x), k.y+int(event.y-self.drag_y) )
                else:
            self.layout.move( k.event_box, k.img_to_follow.x + 10,
k.img_to_follow.y + 10 )
        #refresh logic position
                k.x, k.y =3D self.layout.child_get( k.event_box, 'x', 'y' )

class move_test( object ):

    def __init__( self ):

        win =3D gtk.Window( gtk.WINDOW_TOPLEVEL )

        layout =3D gtk.Layout()

        #try to put more images here
        img1 =3D img( 'img.png', layout, None )
        img2 =3D img( 'img.png', layout, img1 )
        img3 =3D img( 'img.png', layout, img2 )
        img4 =3D img( 'img.png', layout, img3 )
        img5 =3D img( 'img.png', layout, img4 )
        img6 =3D img( 'img.png', layout, img5 )
        img7 =3D img( 'img.png', layout, img6 )
        img8 =3D img( 'img.png', layout, img7 )
        img9 =3D img( 'img.png', layout, img8 )
        img10 =3D img( 'img.png', layout, img9 )
        img11 =3D img( 'img.png', layout, img10 )
        img12 =3D img( 'img.png', layout, img11 )
        img13 =3D img( 'img.png', layout, img12 )


        win.add( layout )
        win.show_all()

move_test()
gtk.main()

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sorry for any possible english error XD

bye!

victor matheus
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