Development/Tutorials/KDE2/KHello/Tutorial 4

Description

Now we will make our users very happy by adding a menu!

Source code

/************* khello.h *******************/
// From KHello3
#include <kapp.h>
#include <kmainwindow.h>
#include <kmessagebox.h>
#include <qpushbutton.h>
// end From KHello3
#include <kmenubar.h>
#include <kpopupmenu.h>

// From KHello3
class KHello : public KMainWindow
{
  Q_OBJECT
public:
  KHello();
  void closeEvent(QCloseEvent *);
public slots:
  void slotHello();
  void slotExit();
private:
  QPushButton *btnHello;
  QPushButton *btnExit;
// end From KHello3
  KMenuBar *menu;
  KPopupMenu *file, *help;
};

/************* khello.cc ******************/
// From KHello3
#include "khello.moc"
#include <kmessagebox.h>

KHello::KHello() : KMainWindow()
{
  btnHello = new QPushButton("Hello", this);
  btnHello->setGeometry(45,30,50,25);
  btnHello->show();
  connect(btnHello, SIGNAL(clicked()), this, SLOT(slotHello()));

  btnExit = new QPushButton("Exit", this);
  btnExit->setGeometry(105,30,50,25);
  btnExit->show();
  connect(btnExit, SIGNAL(clicked()), this, SLOT(slotExit()));
// end From KHello3
  file = new KPopupMenu();
  file->insertItem("&Hello", this, SLOT(slotHello()));
  file->insertItem("&Exit", this, SLOT(slotExit()));
  
  help = helpMenu("KHello\nby Daniel Marjamäki\nUpdated by David Leimbach");
  
  menu = menuBar();
  menu->insertItem("&File", file);
  menu->insertItem("&Help", help);
}
// From KHello3
void KHello::closeEvent(QCloseEvent *e)
{
  kapp->beep();
  KMainWindow::closeEvent(e);
}

void KHello::slotHello()
{
  KMessageBox::information(this, "Hello World!", "Important");
}

void KHello::slotExit()
{
  close();
}
// end From KHello3

Important code

This code was simple and didn't need any explaining. However, I think one line was important, and will comment it.

help = helpMenu("KHello\nby Daniel Marjamäki\nUpdated by David Leimbach");

KMainWindow has a built in function which generates a help menu. Use it, in order to make your application consistent to other KDE programs.

Compiling

[on linux where KDEDIR and QTDIR contain the paths to where KDE and Qt are installed respectively] [FreeBSD 5.x users may omit the -ldl]

g++ -c -I$KDEDIR/include -I$QTDIR/include -fno-rtti main.cc
moc khello.h -o khello.moc
g++ -c -I$KDEDIR/include -I$QTDIR/include -fno-rtti khello.cc
g++ -L$KDEDIR/lib -L$QTDIR/lib -lkdeui -lkdecore -lqt -ldl -o khello main.o khello.o