On Tue, 18 Jul 2000 09:29:47 +0200, MOULET Xavier FTRD/DMR/ISS
<[EMAIL PROTECTED]> wrote:
> 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()
I think you might have the source and destination mixed up.
try ->
# if no tree, create one
if me.subtree == None:
me.subtree = GtkTree ()
me.subtree.show ()
#noeud.gtknode.set_subtree(me.subtree)
widget.set_subtree (me.subtree) # widget is where you are
# dragging to
#noeud.gtknode.reparent(me.subtree)
#noeud.gtknode.show()
# remember to remove the item you drag, that caused the
# gtk warning.
# noeud.gtknode is the item you are dragging, and 'tree' is
# the original tree you created in App.__init__()
global tree
tree.remove_item (noeud.gtknode)
me.subtree.append (noeud.gtknode)
there's also some changes to class App ->
> # 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)
>
global tree
> self.tree = GtkTree()
tree = self.tree
> 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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>
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