Qt Toolkit - menu/menu.cpp example file

# Using menus

This example demontrates simple use of menus (a menu bar and pull-down menus). Qt also supports popup menus, but this example doesn't contain any.

    /****************************************************************************
    ** $Id: menu.cpp,v 2.15 1998/06/16 11:39:33 warwick Exp $
    **
    ** Copyright (C) 1992-1998 Troll Tech AS.  All rights reserved.
    **
    ** This file is part of an example program for Qt.  This example
    ** program may be used, distributed and modified without limitation.
    **
    *****************************************************************************/

    #include "menu.h"
    #include <qpopupmenu.h>
    #include <qkeycode.h>
    #include <qapplication.h>
    #include <qmessagebox.h>
    #include <qpixmap.h>

    /* XPM */
    static const char * p1_xpm[] = {
    "16 16 3 1",
    "       c None",
    ".      c #000000000000",
    "X      c #FFFFFFFF0000",
    "                ",
    "                ",
    "         ....   ",
    "        .XXXX.  ",
    " .............. ",
    " .XXXXXXXXXXXX. ",
    " .XXXXXXXXXXXX. ",
    " .XXXXXXXXXXXX. ",
    " .XXXXXXXXXXXX. ",
    " .XXXXXXXXXXXX. ",
    " .XXXXXXXXXXXX. ",
    " .XXXXXXXXXXXX. ",
    " .XXXXXXXXXXXX. ",
    " .XXXXXXXXXXXX. ",
    " .............. ",
    "                "};

    /* XPM */
    static const char * p2_xpm[] = {
    "16 16 3 1",
    "       c None",
    ".      c #000000000000",
    "X      c #FFFFFFFFFFFF",
    "                ",
    "   ......       ",
    "   .XXX.X.      ",
    "   .XXX.XX.     ",
    "   .XXX.XXX.    ",
    "   .XXX.....    ",
    "   .XXXXXXX.    ",
    "   .XXXXXXX.    ",
    "   .XXXXXXX.    ",
    "   .XXXXXXX.    ",
    "   .XXXXXXX.    ",
    "   .XXXXXXX.    ",
    "   .XXXXXXX.    ",
    "   .........    ",
    "                ",
    "                "};

    /* XPM */
    static const char * p3_xpm[] = {
    "16 16 3 1",
    "       c None",
    ".      c #000000000000",
    "X      c #FFFFFFFFFFFF",
    "                ",
    "                ",
    "   .........    ",
    "  ...........   ",
    "  ........ ..   ",
    "  ...........   ",
    "  ...........   ",
    "  ...........   ",
    "  ...........   ",
    "  ...XXXXX...   ",
    "  ...XXXXX...   ",
    "  ...XXXXX...   ",
    "  ...XXXXX...   ",
    "   .........    ",
    "                ",
    "                "};

    MenuExample::MenuExample( QWidget *parent, const char *name )
        : QWidget( parent, name )
    {
        QPixmap p1( p1_xpm );
        QPixmap p2( p2_xpm );
        QPixmap p3( p3_xpm );

        QPopupMenu *print = new QPopupMenu;
        CHECK_PTR( print );
        print->insertItem( "&Print to printer", this, SLOT(printer()) );
        print->insertItem( "Print to &file", this, SLOT(file()) );
        print->insertItem( "Print to fa&x", this, SLOT(fax()) );
        print->insertSeparator();
        print->insertItem( "Printer &Setup", this, SLOT(printerSetup()) );

        QPopupMenu *file = new QPopupMenu();
        CHECK_PTR( file );
        file->insertItem( p1, "&Open",  this, SLOT(open()), CTRL+Key_O );
        file->insertItem( p2, "&New", this, SLOT(news()), CTRL+Key_N );
        file->insertItem( p3, "&Save", this, SLOT(save()), CTRL+Key_S );
        file->insertItem( "&Close", this, SLOT(closeDoc()), CTRL+Key_W );
        file->insertSeparator();
        file->insertItem( "&Print", print, CTRL+Key_P );
        file->insertSeparator();
        file->insertItem( "E&xit",  qApp, SLOT(quit()), CTRL+Key_Q );

        QPopupMenu *edit = new QPopupMenu();
        CHECK_PTR( edit );
        int undoID = edit->insertItem( "&Undo", this, SLOT(undo()) );
        int redoID = edit->insertItem( "&Redo", this, SLOT(redo()) );
        edit->setItemEnabled( undoID, FALSE );
        edit->setItemEnabled( redoID, FALSE );

        options = new QPopupMenu();
        CHECK_PTR( options );
        options->insertItem( "&Normal Font", this, SLOT(normal()) );
        options->insertSeparator();
        boldID = options->insertItem( "&Bold", this, SLOT(bold()) );
        underlineID = options->insertItem( "&Underline", this, SLOT(underline()) );
        isBold = FALSE;
        isUnderline = FALSE;
        options->setCheckable( TRUE );

        QPopupMenu *help = new QPopupMenu;
        CHECK_PTR( help );
        help->insertItem( "&About", this, SLOT(about()), CTRL+Key_H );
        help->insertItem( "About &Qt", this, SLOT(aboutQt()) );

        menu = new QMenuBar( this );
        CHECK_PTR( menu );
        menu->insertItem( "&File", file );
        menu->insertItem( "&Edit", edit );
        menu->insertItem( "&Options", options );
        menu->insertSeparator();
        menu->insertItem( "&Help", help );
        menu->setSeparator( QMenuBar::InWindowsStyle );

        label = new QLabel( this );
        CHECK_PTR( label );
        label->setGeometry( 20, rect().center().y()-20, width()-40, 40 );
        label->setFrameStyle( QFrame::Box | QFrame::Raised );
        label->setLineWidth( 1 );
        label->setAlignment( AlignCenter );

        connect( this,  SIGNAL(explain(const char *)),
                 label, SLOT(setText(const char *)) );

        setMinimumSize( 100, 80 );
    }

    void MenuExample::open()
    {
        emit explain( "File/Open selected" );
    }

    void MenuExample::news()
    {
        emit explain( "File/New selected" );
    }

    void MenuExample::save()
    {
        emit explain( "File/Save selected" );
    }

    void MenuExample::closeDoc()
    {
        emit explain( "File/Close selected" );
    }

    void MenuExample::undo()
    {
        emit explain( "Edit/Undo selected" );
    }

    void MenuExample::redo()
    {
        emit explain( "Edit/Redo selected" );
    }

    void MenuExample::normal()
    {
        isBold = FALSE;
        isUnderline = FALSE;
        options->setItemChecked( boldID, isBold );
        options->setItemChecked( underlineID, isUnderline );
        emit explain( "Options/Normal selected" );
    }

    void MenuExample::bold()
    {
        isBold = !isBold;
        options->setItemChecked( boldID, isBold );
        emit explain( "Options/Bold selected" );
    }

    void MenuExample::underline()
    {
        isUnderline = !isUnderline;
        options->setItemChecked( underlineID, isUnderline );
        emit explain( "Options/Underline selected" );
    }

    void MenuExample::about()
    {
        QMessageBox::about( this, "Qt Menu Example",
                            "This example demonstrates simple use of Qt menus.\n"
                            "You can cut and paste lines from it to your own\n"
                            "programs." );
    }

    void MenuExample::aboutQt()
    {
        QMessageBox::aboutQt( this, "Qt Menu Example" );
    }

    void MenuExample::printer()
    {
        emit explain( "File/Printer/Print selected" );
    }

    void MenuExample::file()
    {
        emit explain( "File/Printer/Print To File selected" );
    }

    void MenuExample::fax()
    {
        emit explain( "File/Printer/Print To Fax selected" );
    }

    void MenuExample::printerSetup()
    {
        emit explain( "File/Printer/Printer Setup selected" );
    }

    void MenuExample::resizeEvent( QResizeEvent * )
    {
        label->setGeometry( 20, rect().center().y()-20, width()-40, 40 );
    }

    int main( int argc, char ** argv )
    {
        QApplication a( argc, argv );
        MenuExample m;

        a.setMainWidget( &m );
        m.show();
        return a.exec();
    }