Added FbTk::relaySignal, which relays new signals to old Subject type signals.

src/FbTk/RelaySignal.hh

@@ -0,0 +1,62 @@
+// RelaySignal.hh
+// Copyright (c) 2010 Fluxbox Team (fluxgen at fluxbox dot org)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+#ifndef FBTK_RELAY_SIGNAL_HH
+#define FBTK_RELAY_SIGNAL_HH
+
+#include "Signal.hh"
+#include "MemFun.hh"
+#include "Subject.hh"
+
+namespace FbTk {
+
+/**
+ * Relays a new signal type to the old subject type signal. When the new signal
+ * emits the subject notify() will be called.
+ * This function is temporary and just a helper during transition between old
+ * and new signal system.
+ *
+ * @param from The original source of the signal.
+ * @param to_subject The destination Subject.
+ */
+template < typename Signal >
+void relaySignal(Signal& from, FbTk::Subject& to_subject) {
+    from.connect(MemFunIgnoreArgs(to_subject, &FbTk::Subject::notify));
+}
+
+/**
+ * Relays a new signal type to the old subject type signal. When the new signal
+ * emits the subject notify() will be called.
+ * This function is temporary and just a helper during transition between old
+ * and new signal system.
+ *
+ * @param tracker Keeps track of signals
+ * @param from The original source of the signal.
+ * @param to_subject The destination Subject
+ */
+template < typename Signal >
+void relaySignal(SignalTracker& tracker, Signal& from, FbTk::Subject& to_subject) {
+    tracker.join(from, MemFunIgnoreArgs(to_subject, &FbTk::Subject::notify));
+}
+
+} // end namespace FbTk
+
+#endif // FBTK_RELAY_SIGNAL_HH

src/tests/Makefile

@@ -1,5 +1,5 @@
 CXX=g++
-CXXFLAGS= -I.. -I../FbTk -I../.. -DDEBUG -DUSE_XFT -Wall -g -O2 ../FbTk/libFbTk.a
+CXXFLAGS= -I.. -I../FbTk -I../.. -DDEBUG -DUSE_XFT -Wall -g -O2 -fno-inline
 LIBS= 
 XFLAGS= -I/usr/X11R6/include
 XLIBS= -L/usr/X11R6/lib -lX11 -lXft -lXpm -lImlib2
@@ -17,7 +17,7 @@ glxtest: ../FbTk/App.hh glxtest.cc
 	${CXX} glxtest.cc ${CXXFLAGS} ${XLIBS} -lGL -lGLU -lXpm -o glxtest
 
 testSignals: testSignals.o ../FbTk/Signal.hh ../FbTk/MemFun.hh
-	$(CXX) $(LIBS) testSignals.o -o testSignals
+	$(CXX) $(LIBS) testSignals.o -o testSignals ../FbTk/libFbTk.a
 
 testStringUtil: StringUtiltest.o
 	$(CXX) $(LIBS) StringUtiltest.o ../FbTk/libFbTk.a -o testStringUtil

src/tests/testSignals.cc

@@ -3,6 +3,9 @@ using namespace std;
 
 #include "../FbTk/Signal.hh"
 #include "../FbTk/MemFun.hh"
+#include "../FbTk/RelaySignal.hh"
+#include "../FbTk/Observer.hh"
+#include "../FbTk/Subject.hh"
 
 #include <string>
 
@@ -138,5 +141,24 @@ int main() {
                        2.9);
 
     }
-
+    // Test relay new signals to old
+    {
+        cout << "---------- Testing relay of signals" << endl;
+        struct Observer: public FbTk::Observer {
+            void update(FbTk::Subject* subj) {
+                cout << "Observer called." << endl;
+            }
+        };
+        // setup old subject->observer listening
+        FbTk::Subject destination;
+        Observer obs;
+        destination.attach(&obs);
+        // create a new signal and relay it to the
+        // old subject
+        FbTk::Signal<void, string> source;
+        FbTk::relaySignal(source, destination);
+        // the new signal should now make the old
+        // subject notify its observers
+        source.emit("hello world");
+    }
 }