[pygtk] treeview.scroll_to_cell() has no effect

[Karl Ostmo]

On Sat, Sep 13, 2008 at 1:37 PM, Karl Ostmo <kostmo at purdue.edu> wrote:

> Does anyone know what is wrong with my usage of scroll_to_cell( ) ?  When I
> run the program below, after I click on a row and scroll such that it is out
> of view, I would expect that when I click on the "Scroll to highlighted row"
> button that the row would be brought back into view.
>
> Thanks,
> Karl
>
> #!/usr/bin/python
>
> from pygtk import require
> require('2.0')
> import gtk, gobject
>
> class TreeviewTest(gtk.Window):
>     def __init__(self):
>         gtk.Window.__init__( self, gtk.WINDOW_TOPLEVEL )
>         self.connect("destroy", self.destroy)
>
>         vbox = gtk.VBox(False, 5)
>         self.add( vbox )
>
>         button = gtk.Button("Scroll to highlighted row")
>         button.connect("clicked", self.cb_scroll)
>         vbox.pack_start(button, False, False)
>
>         self.tv = gtk.TreeView( gtk.TreeStore(gobject.TYPE_STRING,
> gobject.TYPE_STRING) )
>
>         for i, colname in enumerate(["Index", "Name"]):
>             self.tv.append_column( gtk.TreeViewColumn(colname,
> gtk.CellRendererText(), text=i) )
>
>         for i in range(20):
>             self.tv.get_model().append(None, row=(str(i), "Foo"))
>
>         scrolled_window = gtk.ScrolledWindow()
>         scrolled_window.add_with_viewport(self.tv)
>         vbox.pack_start(scrolled_window, True, True)
>
>         self.show_all()
>
>     def cb_scroll(self, widget):
>         selection = self.tv.get_selection()
>         tm, tree_iter = selection.get_selected()
>         path = tm.get_path(tree_iter)
>         print path
>         self.tv.scroll_to_cell(path)
> #        gobject.idle_add(self.tv.scroll_to_cell, path)    # This doesn't
> work either
>
>     def destroy(self, widget, data=None):
>         gtk.main_quit()
>
> if __name__ == "__main__":
>     application = TreeviewTest()
>     gtk.main()
>
>
I ran into this problem again recently and finally solved it.  Google turned
up my old post, so I will post the resolution in case it helps someone else.

The error in the above code is my use of the "add_with_viewport" method.
Since a treeview has native scrolling capability, I should have used the
"add" method instead (see
http://www.pygtk.org/docs/pygtk/class-gtkscrolledwindow.html#method-gtkscrolledwindow--add-with-viewport).
 Making that change to the code above fixes it!

HTH,
Karl
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