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- #ifndef K3DSDK_SIGNAL_ACCUMULATORS_H
- #define K3DSDK_SIGNAL_ACCUMULATORS_H
-
- // K-3D
- // Copyright (c) 1995-2004, Timothy M. Shead
- //
- // Contact: tshead@k-3d.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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-
- #include "log.h"
- #include <iostream>
-
- namespace k3d
- {
-
- namespace signal
- {
-
- /** Defines a signal accumulator for libsigc++ signals that require slots returning bool.
- iff any slot returns "false", signal emission is stopped immediately and the signal will
- return "false". Otherwise, the signal will return "true". This is handy for signals that
- represent some action that any observer can cancel, e.g. a document object can prevent
- the application from closing if the document hasn't been saved. */
-
- class cancelable
- {
- public:
- typedef bool result_type;
-
- template<typename IteratorT>
- result_type operator()(IteratorT First, IteratorT Last)
- {
- for(; First != Last; ++First)
- {
- if(false == *First)
- return false;
- }
-
- return true;
- }
- };
-
- /** Defines a signal accumulator for libsigc++ signals that require slots returning bool.
- iff any slot returns "true", signal emission is stopped immediately and the signal will
- return "true". Otherwise, the signal will return "false". This is handy for signals that
- represent some event that is "consumed" by an observer, e.g. a keyboard event that
- might-or-might-not be used in a hotkey. If used, emission of the event should stop;
- if not, it should continue. */
-
- class consumable
- {
- public:
- typedef bool result_type;
-
- /// New implementation for use with libsigc++ 2.0
- template<typename IteratorT>
- result_type operator()(IteratorT First, IteratorT Last)
- {
- for(; First != Last; ++First)
- {
- if(true == *First)
- return true;
- }
-
- return false;
- }
- };
-
- } // namespace signal
-
- } // namespace k3d
-
- #endif // !K3DSDK_SIGNAL_ACCUMULATORS_H
-
-