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abstract shared parts of switchTo methods away

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This commit is contained in:
Andrzej Rybczak
2012-09-15 22:27:50 +02:00
parent f7dba0a578
commit 14587cb4ec
46 changed files with 301 additions and 463 deletions
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src/screen_switcher.h Normal file
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/***************************************************************************
* Copyright (C) 2008-2012 by Andrzej Rybczak *
* electricityispower@gmail.com *
* *
* This program 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 2 of the License, or *
* (at your option) any later version. *
* *
* 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, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#ifndef _SCREEN_SWITCHER_H
#define _SCREEN_SWITCHER_H
#include "global.h"
class SwitchTo
{
template <bool ToBeExecuted, typename ScreenT> struct TabbableAction_ {
static void execute(ScreenT *) { }
};
template <typename ScreenT> struct TabbableAction_<true, ScreenT> {
static void execute(ScreenT *screen) {
using Global::myScreen;
// it has to work only if both current and previous screens are Tabbable
if (dynamic_cast<Tabbable *>(myScreen))
screen->setPreviousScreen(myScreen);
}
};
public:
template <typename ScreenT>
static void execute(ScreenT *screen)
{
using Global::myScreen;
using Global::myLockedScreen;
const bool isScreenMergable = screen->isMergable() && myLockedScreen;
const bool isScreenTabbable = std::is_base_of<Tabbable, ScreenT>::value;
assert(myScreen != screen);
if (isScreenMergable)
updateInactiveScreen(screen);
if (screen->hasToBeResized || isScreenMergable)
screen->resize();
TabbableAction_<isScreenTabbable, ScreenT>::execute(screen);
myScreen = screen;
}
};
#endif // _SCREEN_SWITCHER_H