add signal/slot implementation 'framework'

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@21781 a592a061-630c-0410-9148-cb99ea01b6c8

src/support/Makefile.am

@@ -77,6 +77,9 @@ liblyxsupport_la_SOURCES = \
 	strfwd.h \
 	Systemcall.cpp \
 	Systemcall.h \
+	SignalSlot.cpp \
+	SignalSlot.h \
+	SignalSlotPrivate.h \
 	tempname.cpp \
 	textutils.h \
 	Translator.h \

src/support/SignalSlot.cpp

@@ -0,0 +1,72 @@
+// -*- C++ -*-
+/**
+ * \file SignalSlot.cpp
+ * This file is part of LyX, the document processor.
+ * Licence details can be found in the file COPYING.
+ *
+ * \author André Pönitz
+ *
+ * Full author contact details are available in file CREDITS.
+ */
+
+#include "SignalSlot.h"
+#include "SignalSlotPrivate.h"
+
+namespace lyx {
+
+/////////////////////////////////////////////////////////////////////
+//
+// Signal
+//
+/////////////////////////////////////////////////////////////////////
+
+Signal::Signal()
+	: impl(new SignalImpl)
+{}
+
+
+Signal::~Signal()
+{
+	delete impl;
+}
+
+
+void Signal::fire()
+{
+	impl->fire();
+}
+
+
+/////////////////////////////////////////////////////////////////////
+//
+// Slot
+//
+/////////////////////////////////////////////////////////////////////
+
+void SlotImpl::called()
+{
+	owner_.called();
+}
+
+Slot::Slot()
+	: impl(new SlotImpl(*this))
+{}
+
+Slot::~Slot()
+{
+	delete impl;
+}
+
+
+/////////////////////////////////////////////////////////////////////
+//
+// Connect
+//
+/////////////////////////////////////////////////////////////////////
+
+void connect(Signal & sig, Slot & slot)
+{
+	QObject::connect(sig.impl, SIGNAL(fire()), slot.impl, SLOT(called()));
+}
+
+} // namespace lyx

src/support/SignalSlot.h

@@ -0,0 +1,51 @@
+// -*- C++ -*-
+/**
+ * \file SignalSlot.h
+ * This file is part of LyX, the document processor.
+ * Licence details can be found in the file COPYING.
+ *
+ * \author André Pönitz
+ *
+ * Full author contact details are available in file CREDITS.
+ */
+
+#ifndef SIGNALSLOT_H
+#define SIGNALSLOT_H
+
+namespace lyx {
+
+class Slot;
+class SlotImpl;
+class SignalImpl;
+
+class Signal
+{
+public:
+	Signal();
+	~Signal();
+	void fire();
+private:
+	Signal(Signal const &);
+	void operator=(Signal const &);
+	SignalImpl * impl;
+	friend void connect(Signal & sig, Slot & slot);
+};
+
+class Slot
+{
+public:
+	Slot();
+	virtual ~Slot();
+	virtual void called() {}
+private:
+	Slot(Slot const &);
+	void operator=(Slot const &);
+	SlotImpl * impl;
+	friend void connect(Signal & sig, Slot & slot);
+};
+
+void connect(Signal & sig, Slot & slot);
+
+} // namespace lyx
+
+#endif

src/support/SignalSlotPrivate.h

@@ -0,0 +1,47 @@
+// -*- C++ -*-
+/**
+ * \file SignalSlotPrivate.h
+ * This file is part of LyX, the document processor.
+ * Licence details can be found in the file COPYING.
+ *
+ * \author André Pönitz
+ *
+ * Full author contact details are available in file CREDITS.
+ */
+
+#ifndef SIGNALSLOTPRIVATE_H
+#define SIGNALSLOTPRIVATE_H
+
+#include <QObject>
+
+namespace lyx {
+
+class SignalImpl : public QObject
+{
+	Q_OBJECT
+public:
+	SignalImpl() {}
+	virtual ~SignalImpl() {}
+	
+Q_SIGNALS:
+	void fire();
+	friend class Signal;
+};
+
+
+class Slot;
+class SlotImpl : public QObject
+{
+	Q_OBJECT
+public:
+	SlotImpl(Slot & owner) : owner_(owner) {}
+	virtual ~SlotImpl() {}
+public Q_SLOTS:
+	void called();
+private:
+	Slot & owner_;
+};
+
+} // namespace lyx
+
+#endif // SIGNALSLOTPRIVATE_H