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/*
* Copyright © 2012 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3,
* as published by the Free Software Foundation.
*
* This program 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/>.
*
* Authored By: Robert Carr <robert.carr@canonical.com>
*/
#include "registration_order_focus_sequence.h"
#include "mir/frontend/session.h"
#include "mir/shell/session_container.h"
#include <boost/throw_exception.hpp>
#include <memory>
#include <cassert>
#include <algorithm>
#include <stdexcept>
namespace mf = mir::frontend;
namespace msh = mir::shell;
msh::RegistrationOrderFocusSequence::RegistrationOrderFocusSequence(std::shared_ptr<msh::SessionContainer> const& app_container) :
session_container(app_container)
{
}
std::shared_ptr<msh::Session> msh::RegistrationOrderFocusSequence::successor_of(std::shared_ptr<Session> const& focused_app) const
{
std::shared_ptr<Session> result, first;
bool found{false};
session_container->for_each(
[&](std::shared_ptr<Session> const& session)
{
if (!first)
{
first = session;
}
if (found)
{
if (!result) result = session;
}
else if (focused_app == session)
{
found = true;
}
});
if (result)
{
return result;
}
else if (found)
{
return first;
}
else
{
BOOST_THROW_EXCEPTION(std::logic_error("Invalid session"));
}
}
std::shared_ptr<msh::Session> msh::RegistrationOrderFocusSequence::predecessor_of(std::shared_ptr<Session> const& focused_app) const
{
std::shared_ptr<Session> result, last;
bool found{false};
session_container->for_each(
[&](std::shared_ptr<Session> const& session)
{
last = session;
if (focused_app == session)
{
found = true;
}
else if (!found)
{
result = session;
}
});
if (result)
{
return result;
}
if (found)
{
return last;
}
else
{
BOOST_THROW_EXCEPTION(std::logic_error("Invalid session"));
}
}
std::shared_ptr<msh::Session> msh::RegistrationOrderFocusSequence::default_focus() const
{
std::shared_ptr<Session> result;
session_container->for_each(
[&](std::shared_ptr<Session> const& session)
{
result = session;
});
return result;
}
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