On Sat, Dec 27, 2008 at 09:59:55AM +0100, Alessandro Dentella wrote:
> > > 1. the explanation is exactly the same as for "emit_stop_by_name": which
> > > is the difference?
> > >
> > >
> > They are the same.
>
> ok, I guess some hystorical reason...
>
> > Some signals provide an explicit means of stopping the signal emission
> > using a return value from a handler. The "clicked" handler is not
> > supposed to provide a return value so returning True does nothing.
This sentenced induced me to think that "stop_emission" could be used always
while return True only by those signals that support it.
On the contrary in the following example I try to stop emission of
key-press-event from within the 'edited' callback back to the treeview
callback and it seems not to work.
I connected with Tab from the treeview a callback that shiftws the cell to
be edited, but I'd like to stop it under some conditions from within
editabel callback. it's enought to "return True" (Line #### 59) and it works
but it does not work instead the line:
self.treeview.emit_stop_by_name('key-press-event')
Did I mis-interpret the signal?
sandro
*:-)
#!/usr/bin/python
import gtk
import gtk.gdk
import gobject
class Tree(object):
def __init__(self):
self.w = gtk.Window()
self.w.connect('destroy', gtk.main_quit)
self.treeview = gtk.TreeView()
self.w.add(self.treeview)
self.model = gtk.ListStore(str, str)
self.treeview.set_model(self.model)
self.col1, cell1 = self.add_col('col1', 0)
self.col2, cell2 = self.add_col('col2', 1)
self.treeview.connect('key-press-event', self.on_tree_key_press)
cell1.connect('editing-started', self.text_editing_started_cb)
cell1.connect('edited', self.text_edited_cb )
self.fill_model()
self.w.show_all()
def on_tree_key_press(self, widget, event):
ksym = gtk.gdk.keyval_name(event.keyval)
if ksym == "Tab":
print "Tab from treeview"
path, col = self.treeview.get_cursor()
#self.treeview.set_cursor(path, self.col2, True)
self.tag = gobject.idle_add(self.treeview.set_cursor, path,
self.col2, True)
def add_col(self, label, pos):
cell = gtk.CellRendererText()
cell.set_property('editable', True)
cell.set_property('editable-set', True)
col = gtk.TreeViewColumn(label)
col.pack_start(cell)
col.add_attribute(cell, 'text', pos )
col.set_expand(True)
self.treeview.append_column(col)
return col, cell
def text_editing_started_cb(self, cell, editable, path):
#editable.connect('editing-done', self.editing_done_cb)
editable.connect('key-press-event', self.on_editable_cb)
def text_edited_cb(self, cell, editable, path):
#self.treeview.stop_emission
pass
def on_editable_cb(self, widget, event):
ksym = gtk.gdk.keyval_name(event.keyval)
if ksym == "Tab":
print "Tab from editable"
#return True #### line 59
#gobject.source_remove(self.tag)
widget.stop_emission('key-press-event')
#self.treeview.stop_emission('key-press-event')
self.treeview.emit_stop_by_name('key-press-event')
# def editing_done_cb(self, celleditable):
# if celleditable.get_text() == 'x':
# celleditable.stop_emission('remove-widget')
def fill_model(self):
for i in ('uno', 'due', 'tre'):
self.model.append([i *3, i*2])
t = Tree()
t.w.resize(400, 200)
#t.treeview.set_cursor(0, t.col2, True)
try:
gtk.main()
except KeyboardInterrupt, e:
pass
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