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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /graphics/epix/active_screen.h
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+/*
+ * active_screen.h -- ePiX screen_broker class
+ *
+ * This file is part of ePiX, a C++ library for creating high-quality
+ * figures in LaTeX
+ *
+ * Version 1.1.11
+ * Last Change: August 15, 2007
+ */
+
+/*
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ * Andrew D. Hwang <rot 13 nujnat at zngupf dot ubylpebff dot rqh>
+ * Department of Mathematics and Computer Science
+ * College of the Holy Cross
+ * Worcester, MA, 01610-2395, USA
+ */
+
+/*
+ * ePiX 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.
+ *
+ * ePiX 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 ePiX; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*
+ * A screen_broker is a simple stack of screen*, permitting client code
+ * to activate a screen then restore the state later. No attempt is made
+ * to handle concurrent threads, but the global "deactivate" function
+ * in picture.h prints a warning if its argument is not active.
+ */
+#ifndef EPIX_ACTIVE_SCREEN
+#define EPIX_ACTIVE_SCREEN
+
+#include <list>
+
+namespace ePiX {
+
+ class screen;
+
+ class screen_broker {
+ public:
+ screen_broker();
+
+ // no need for destructor; we don't manage resources
+
+ screen* active() const;
+ void push(screen&);
+ screen* pop();
+
+ private:
+ std::list<screen*> m_screens;
+
+ // forbid copying
+ screen_broker(const screen_broker&);
+ screen_broker& operator= (const screen_broker&);
+ };
+
+ screen_broker& the_screen_stack();
+ screen* active_screen();
+} // end of namespace
+
+#endif /* EPIX_ACTIVE_SCREEN */