Johannes Jordens <[EMAIL PROTECTED]> writes:
> Question: How do I get an iter to the row preceding the selected one?
> alternatively, how do I implement moving a row upwards?
In a ListStore, you can do something like this:
path = listiter.get_path()
row = path[0]
assert row > 0
prev_row = row - 1
prev_iter = listmodel.get_iter(prev_row)
This makes use of the fact that in a ListStore the path is a 1-tuple
that gives the row number.
Since we typically want to operate on the selected row, I use an up
button 'clicked' handler that looks something like this:
def on_up_button__clicked(button, my_model):
"""Move the selected row up. """
selection = my_model.get_selection()
model, selected = selection.get_selected()
assert not selected is None
path = model.get_path(selected)
row = path[0]
assert row > 0
this = model[row][0]
prev = model[row-1][0]
model[row-1][0] = this
model[row][0] = prev
selection.select_path(row-1)
(Here I have passed the model as an extra argument to the handler.
Use any convenient means to get the treeview selection.) The code
works for a 1-column liststore. You need to make the obvious
modifications if the liststore has more columns. [We would like to
use the ListStore.move_before() and ListStore.move_after() methods,
but since they are gtk+ 2.2 API additions they aren't wrapped yet by
pygtk.] I make liberal use of the pygtk binding's Python list-like
API; you can use model.get_value() and model.set_value() if you
prefer. (This is explained in the excellent pygtk FAQ.)
The assertions check to make sure that the move up makes sense since I
use a 'changed' handler on the selection to make the up button
insensitive when the selected row can't be moved up. If this function
might be called when the move can't be made you can instead simply
return rather than causing an assertion failure. In case you're
interested, the selection 'changed' handler method that I use looks
like this:
def selection_changed(self, selection):
"""Set button sensitivities after treeview selection changes. """
model, selected = selection.get_selected()
has_selection = bool(selected)
self.remove_button.set_sensitive(has_selection)
path = has_selection and model.get_path(selected)
self.up_button.set_sensitive(path and path[0] > 0)
self.down_button.set_sensitive(path and path[0] < len(model)-1)
Here again pygtk's nifty Python list API for ListStore helps by
letting us easily find the number of rows in the model with a simple
len(model).
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