Add a slot to mainwindow but amend to use Q_SLOTS

For some reason, 'private slots:' causes a build error but private
Q_SLOTS: works.

The error was that 'slots' did not name a type and it appeared to be
insensitive to whether the Makefile rule for .moc was in its current
place or preceeded the rule for .cpp.

Add a slot using the connectByName idiom e.g. actionNew connects to slot
on_actionNew_triggered(). Use qDebug to show this fires if the menu
option is selected.

Above to demonstrate how to begin to link menu to code paths.

Signed-off-by: Amit Chaudhuri <amit.k.chaudhuri@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/mainwindow.cpp

@@ -2,10 +2,16 @@
 #include "ui_mainwindow.h"
 
 #include <QVBoxLayout>
+#include <QtDebug>
 
 MainWindow::MainWindow() : ui(new Ui::MainWindow())
 {
 	ui->setupUi(this);
 }
 
+void MainWindow::on_actionNew_triggered()
+{
+    qDebug() << "actionNew";
+}
+
 #include "mainwindow.moc"

qt-ui/mainwindow.h

@@ -3,6 +3,7 @@
 
 #include <QMainWindow>
 
+
 namespace Ui
 {
 	class MainWindow;
@@ -13,12 +14,18 @@ class DiveNotes;
 class Stats;
 class Equipment;
 
-class MainWindow : public QMainWindow{
-	Q_OBJECT
+class MainWindow : public QMainWindow
+{
+Q_OBJECT
 public:
 	MainWindow();
+
+private Q_SLOTS:
+
+	void on_actionNew_triggered();
+
 private:
 	Ui::MainWindow *ui;
 };
 
-#endif
+#endif