+ implement mechanism to connect QAction signal with class method

src/Gui/ActionFunction.cpp

@@ -0,0 +1,71 @@
+/***************************************************************************
+ *   Copyright (c) 2015 Werner Mayer <wmayer[at]users.sourceforge.net>     *
+ *                                                                         *
+ *   This file is part of the FreeCAD CAx development system.              *
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or         *
+ *   modify it under the terms of the GNU Library General Public           *
+ *   License as published by the Free Software Foundation; either          *
+ *   version 2 of the License, or (at your option) any later version.      *
+ *                                                                         *
+ *   This library  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 Library General Public License for more details.                  *
+ *                                                                         *
+ *   You should have received a copy of the GNU Library General Public     *
+ *   License along with this library; see the file COPYING.LIB. If not,    *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
+ *   Suite 330, Boston, MA  02111-1307, USA                                *
+ *                                                                         *
+ ***************************************************************************/
+
+
+#include "PreCompiled.h"
+
+#ifndef _PreComp_
+#endif
+
+#include "ActionFunction.h"
+
+using namespace Gui;
+
+
+namespace Gui {
+class ActionFunctionPrivate
+{
+public:
+    QMap<QAction*, boost::function<void()> > actionFuncMap;
+};
+}
+
+ActionFunction::ActionFunction(QObject* parent)
+  : QObject(parent), d_ptr(new ActionFunctionPrivate())
+{
+}
+
+ActionFunction::~ActionFunction()
+{
+}
+
+void ActionFunction::mapSignal(QAction* action, boost::function<void()> func)
+{
+    Q_D(ActionFunction);
+
+    d->actionFuncMap[action] = func;
+    connect(action, SIGNAL(triggered()), this, SLOT(trigger()));
+}
+
+void ActionFunction::trigger()
+{
+    Q_D(ActionFunction);
+
+    QAction* a = qobject_cast<QAction*>(sender());
+    QMap<QAction*, boost::function<void()> >::iterator it = d->actionFuncMap.find(a);
+    if (it != d->actionFuncMap.end()) {
+        // invoke the class function here
+        it.value()();
+    }
+}
+
+#include "moc_ActionFunction.cpp"

src/Gui/ActionFunction.h

@@ -0,0 +1,86 @@
+/***************************************************************************
+ *   Copyright (c) 2015 Werner Mayer <wmayer[at]users.sourceforge.net>     *
+ *                                                                         *
+ *   This file is part of the FreeCAD CAx development system.              *
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or         *
+ *   modify it under the terms of the GNU Library General Public           *
+ *   License as published by the Free Software Foundation; either          *
+ *   version 2 of the License, or (at your option) any later version.      *
+ *                                                                         *
+ *   This library  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 Library General Public License for more details.                  *
+ *                                                                         *
+ *   You should have received a copy of the GNU Library General Public     *
+ *   License along with this library; see the file COPYING.LIB. If not,    *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
+ *   Suite 330, Boston, MA  02111-1307, USA                                *
+ *                                                                         *
+ ***************************************************************************/
+
+
+#ifndef GUI_ACTIONFUNCTION_H
+#define GUI_ACTIONFUNCTION_H
+
+#include <QObject>
+#include <boost/function.hpp>
+
+namespace Gui
+{
+
+class ActionFunctionPrivate;
+
+/*!
+  The class connects the triggered() signal of a QAction instance with the method
+  of a usual C++ class not derived from QObject.
+
+  The class can e.g be used to fill up the context-menu of the view provider classes.
+  \code
+    void MyViewProvider::setupContextMenu(QMenu* menu, QObject* receiver, const char* member)
+    {
+        Gui::ActionFunction* func = new Gui::ActionFunction(menu);
+
+        QAction* a1 = menu->addAction(QObject::tr("Menu item 1..."));
+        func->mapSignal(a1, boost::bind(&MyViewProvider::doItem1, this));
+
+        QAction* a2 = menu->addAction(QObject::tr("Menu item 2..."));
+        func->mapSignal(a2, boost::bind(&MyViewProvider::doItem2, this));
+
+        QAction* a3 = menu->addAction(QObject::tr("Menu item 3..."));
+        func->mapSignal(a3, boost::bind(&MyViewProvider::doItem3, this));
+    }
+  \endcode
+
+  @author Werner Mayer
+
+  http://www.boost.org/doc/libs/1_57_0/libs/bind/bind.html#with_boost_function
+*/
+class GuiExport ActionFunction : public QObject
+{
+    Q_OBJECT
+
+public:
+    /// Constructor
+    ActionFunction(QObject*);
+    virtual ~ActionFunction();
+
+    /*!
+       Connects the QAction's triggered() signal with the function \a func
+     */
+    void mapSignal(QAction* a, boost::function<void()> func);
+
+private Q_SLOTS:
+    void trigger();
+
+private:
+    QScopedPointer<ActionFunctionPrivate> d_ptr;
+    Q_DISABLE_COPY(ActionFunction)
+    Q_DECLARE_PRIVATE(ActionFunction)
+};
+
+} //namespace Gui
+
+
+#endif // GUI_ACTIONFUNCTION_H