Re: TreeView - First element

[Daniel Elstner <daniel kitta googlemail com>]

Hi,

Am Dienstag, den 05.01.2010, 05:44 -0800 schrieb Adam Chyla [PL]:
> It should works.
> 
> Try this: http://chyla.site90.net/gtk_foobar-0.1.tar.gz

You were simply not testing whether the position after the selected item
is actually valid.  The corrected code is attached.

Note that I used operator bool() instead of comparing against the end()
iterator, but I did so only for convenience.  Either way works.

Cheers,
--Daniel

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
/*
 * main.cc
 * Copyright (C) Adam Chyła 2010 <adam chyla gmail com>
 * 
 * gtk-foobar is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * gtk-foobar is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include "Main.h"
 
 MainClass::MainClass()
 {
	set_title("Hi all!");
	set_default_size(400, 400);
	
	add(MainVBox);
	MainVBox.pack_start(MoveDown, Gtk::PACK_SHRINK);
	MainVBox.pack_start(TreeViewExample);
	
	MoveDown.set_label("MoveDown");
	MoveDown.signal_clicked().connect(sigc::mem_fun(*this, &MainClass::MoveDownFun));

	ListStore = Gtk::ListStore::create(Column);
	TreeViewExample.set_model(ListStore);
	
	row = *(ListStore->append());
	row[Column.first] = "asdf";
	
	row = *(ListStore->append());
	row[Column.first] = "sdcsdcsdcsdcsd";

	TreeViewExample.append_column("First", Column.first);
	
	show_all_children();
	
 }
 
MainClass::~MainClass()
 {
 }
 
 void MainClass::MoveDownFun()
 {
	Glib::RefPtr<Gtk::TreeSelection> selection = TreeViewExample.get_selection();
	Gtk::TreeModel::iterator iter = selection->get_selected();

	if (iter)
        {
		Gtk::TreeModel::iterator next = iter;
		if (++next)
			ListStore->iter_swap(iter, next);
	}
 }