1 files changed, 126 insertions, 0 deletions
diff --git a/dispatcher.h b/dispatcher.h
new file mode 100644
index 0000000..74bbfc3
--- /dev/null
+++ b/dispatcher.h
@@ -0,0 +1,126 @@
+// Copyright (C) 2003 Mooffie <mooffie@typo.co.il>
+//
+// 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, USA.
+
+#ifndef BDE_DISPATCHER_H
+#define BDE_DISPATCHER_H
+
+#include "event.h"
+
+// class Dispatcher represents a class that receives GUI events.
+
+#define INTERACTIVE
+
+struct binding_entry {
+    Event evt;
+    const char *action;
+};
+
+class Dispatcher {
+    
+public:
+
+    Dispatcher() { }
+
+    virtual bool do_action(const char *action) {
+	return false;
+    }
+
+    virtual const char *get_event_action(const Event &evt) {
+	return NULL;
+    }
+    
+    virtual bool get_action_event(const char *action, Event &evt) {
+	return false;
+    }
+    
+    virtual const char *get_action_description(const char *action) {
+	return NULL;
+    }
+
+    virtual bool handle_event(const Event &evt) {
+	return do_action(get_event_action(evt));
+    }
+};
+
+// :TODO: I should use STL's map instead of a simple linear search.
+
+#define HAS_ACTIONS_MAP(CLASS, PARENT_CLASS)    \
+    typedef void (CLASS::*method_ptr)();    \
+    struct action_entry {		    \
+	const char *action;		    \
+	method_ptr method;		    \
+	const char *short_description;	    \
+    };					    \
+    static action_entry actions_table[];    \
+    virtual bool do_action(const char *action) {    \
+	if (!action) return false;		    \
+	action_entry *entry = actions_table;	    \
+	while (entry->action) {			    \
+	    if (!strcmp(entry->action, action)) {   \
+		(this->*(entry->method))();	    \
+		return true;			    \
+	    }					    \
+	    entry++;				    \
+	}					    \
+	return PARENT_CLASS::do_action(action);	    \
+    }						    \
+    virtual const char *get_action_description	    \
+    (const char *action) {			    \
+	if (!action) return NULL;		    \
+	action_entry *entry = actions_table;	    \
+	while (entry->action) {			    \
+	    if (!strcmp(entry->action, action))	    \
+		return entry->short_description;    \
+	    entry++;				    \
+	}					    \
+	return PARENT_CLASS::			    \
+	    get_action_description(action);	    \
+    }
+
+#define ADD_ACTION(CLASS, METHOD, DESC)	\
+ { #METHOD, &CLASS::METHOD, DESC }
+
+#define END_ACTIONS \
+ { 0, 0 }
+
+#define HAS_BINDINGS_MAP(CLASS, PARENT_CLASS)		    	\
+    static binding_entry bindings_table[];		    	\
+    virtual const char *get_event_action(const Event &evt) {	\
+	binding_entry *entry = bindings_table;			\
+	while (entry->action) {					\
+	    if (entry->evt == evt)				\
+		return entry->action;				\
+	    entry++;						\
+	}							\
+	return PARENT_CLASS::get_event_action(evt);		\
+    } \
+    virtual bool get_action_event(const char *action, Event &evt) { \
+	binding_entry *entry = bindings_table;			\
+	while (entry->action) {					\
+	    if (!strcmp(entry->action, action))	{		\
+		evt = entry->evt;				\
+		return true;					\
+	    }							\
+	    entry++;						\
+	}							\
+	return PARENT_CLASS::get_action_event(action, evt);	\
+    }
+
+#define END_BINDINGS \
+ { Event(), 0 }
+
+#endif
+