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moc o hellowin.moc hellowin.h g++ -lkdecore -lkdeui -lqt -o hellowin hellowin.cpp
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Depending on your system, you may also need to specify the location of the KDE libraries and header files. These are usually held in a KDE directory specified in the KDEDIR system variable. Use the -L option with the /lib directory to specify the libraries, and -I options with the /include directory for header files, as in -L$KDEDIR/lib and -I$KDEDIR/include. If KDEDIR is not set, then check with your system administrator or with your Linux distribution manual for the location of the KDE libraries and header files. An example of the compile operation specifying the location of the KDE include and lib directories is shown here:
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g++ -L$KDEDIR/lib -I$KDEDIR/include -lkdecore lkdeui \ -lqt -o hellowin hellowin.cpp
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The displaying of the "Hello World" message will be handled by a KMsgBox object. This class implements a simple dialog box with messages and several buttons, if you want them. In addition to a simple message dialog box, KMsgBox also supports dialog boxes with Yes and No buttons and Yes, No, and Cancel buttons. Be sure to include kmsgbox.h. The basic tasks for creating a Hellowin program are listed here.
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Create the hellowin.h header file that will hold the class definition of the Hellowin class. Include header files that contain class definitions for objects such as windows, buttons, and message boxes. In this case, include the header file for the main window, ktmainwindow.h, for a button, qpushbutton.h, and for a message box, kmsgbox.h.
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Define the Hellowin class, derived from the KTMainWindow class. Give the Hellowin class two slots (functions) called myhello and myexit. Define two pointers to buttons: buttonhi and buttonExit. The myhello.cpp file will hold the main program. Begin it by including header files and the hellowin.moc file, which needs to be separately generated by the MOC preprocessor. Define a constructor function for the Hellowin class, Hellowin::Hellowin. When an object of that class is defined, this function is automatically executed. Create a button object using QPushButton, and assign it to the buttonhi pointer. Set its size and then display it. It is connected to the myhello slot so that when it is clicked, the myhello function is executed. Create another button object using QPushButton, and assign it to the buttonExit pointer. Set its size and then display it. Connect it to the myexit slot so that when it is clicked, the myexit function will be executed. Define a closeEvent function for the Hellowin class. This function should simply end the program by invoking the kapp->quit function. Define the myhello function for the Hellowin class. This should display a separate message box with the message "Hello World". Define the myexit function for the Hellowin class, and set it to close the Hellowin window. In the main function, define a Kapplication called myapp. Define a Hellowin object called mywin. Then set the size of the object. Use the setMainWidget function for myapp to make the mywin object the main application window. Use mywin.show to show that window. Use myapp.exec to run the application.
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The code for the hellowin.h file is shown next. hellowin.h
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#include #include #include #include <kapp.h> <ktmainwindow.h> <qpushbutton.h> <kmsgbox.h>
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class Hellowin : public KTMainWindow { Q_OBJECT public: Hellowin (); void closeEvent(QCloseEvent *); public slots: void myhello(); void myexit(); private: QPushButton *buttonhi; QPushButton *buttonExit; };
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The following is the code for the hellowin.cpp file.
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hellowin.cpp
#include #include #include #include #include <kapp.h> <ktmainwindow.h> <qpushbutton.h> "hellowin.moc" <kmsgbox.h>
Hellowin::Hellowin () : KTMainWindow() { buttonhi = new QPushButton("Hello", this); buttonhi->setGeometry(45,30,50,25); buttonhi->show(); connect(buttonhi, SIGNAL(clicked()), this, SLOT(myhello())); buttonExit = new QPushButton("Exit", this); buttonExit->setGeometry(105,30,50,25); buttonExit->show(); connect(buttonExit, SIGNAL(clicked()), this, SLOT(myexit())); } void Hellowin::closeEvent(QCloseEvent *) { kapp->quit(); } void Hellowin::myhello() { KMsgBox::message(0,"Important","Hello World!"); } void Hellowin::myexit() { close(); } int main( int argc, char **argv ) { KApplication myapp ( argc, argv, "Hello World!" ); Hellowin mywin; mywin.setGeometry(100,100,200,100); myapp.setMainWidget( &mywin ); mywin.show(); return myapp.exec(); }
Menus
To create menus, you create a KDE menu bar and then add Qt menus with their menu items to it. You will need to include the qpopupmenu.h header file for the menus and the kmenubar.h header file for the menu bar, as shown here:
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