Hello everybody. As I told in my last email, I spennt another night on this
and could not find what was causing any trouble. The following program
should let me drag a node over another, and then the dragged node becomes a
child of the other one. drag_data_set were methods of my node object, which
led to many segfaults. Now, I placed them away but I still have problems.
I pass a string to look up at which node is passed, as you can only pass
strings in a drag data I think. My problem is, the dragged data disappears,
the other ones remain as they were and a gtk warning appears. What do I
wrong ? can someone cast some light on me ?
-- Beginning of the "program"
# Sample gnome-python prog
# Imports
from gtk import *
import GDK
import GTK
def drag_data_get (widget,context,data,info,time,user) :
data.set(data.target,123,user)
def drag_data_rec (widget,context,x,y,data,info,time,user) :
if user == data.data :
# drags over myself : do nothing
widget.drag_finish(context,FALSE,FALSE,time)
else :
noeud = app.nodes[data.data] # Look up the dragged
(incoming) node
noeud.gtknode.drag_finish(context,TRUE,TRUE,time)
me = app.nodes[user] # who has it been dragged to ? (whoami
?)
# if no tree, create one
if me.subtree==None :
me.subtree = GtkTree()
me.subtree.show()
noeud.gtknode.set_subtree(me.subtree)
noeud.gtknode.reparent(me.subtree)
noeud.gtknode.show()
# my main node class.
class UI_Node :
def __init__ (self, label="Unknown") :
self.label = label
self.subtree = None
self.gtknode = GtkTreeItem(self.label)
self.gtknode.show()
# Drag interface
target = [('GLOOPNODE',0,-1)]
self.gtknode.drag_source_set(GDK.BUTTON1_MASK,target,GDK.ACTION_COPY)
self.gtknode.connect("drag_data_get",drag_data_get,self.label)
# Drop interface
self.gtknode.connect("drag_data_received",drag_data_rec,self.label)
self.gtknode.drag_dest_set(GTK.DEST_DEFAULT_ALL,target,GDK.ACTION_COPY)
class App :
def __init__(self):
self.window = GtkWindow();
self.window.connect("destroy",mainquit)
self.tree = GtkTree()
self.window.add(self.tree)
self.window.show_all()
self.nodes = {} # Nodes : a dictonnary, keys are names of
nodes, then node is given
def append(self,node) :
self.nodes[node.label] = node
self.tree.append(node.gtknode)
def main (self) :
self.append(UI_Node("foo1"))
self.append(UI_Node("foo2"))
self.append(UI_Node("foo3"))
self.append(UI_Node("foo4"))
if __name__ == '__main__' :
global app
app = App()
app.main()
mainloop()
# dragging a node to another makes :
# Gtk-CRITICAL **: file gtkwidget.c: line 2933
(gtk_widget_reparent_container_child): assertion `client_data != NULL'
failed.
# and the dragged widget disappears.
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