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# A Complete Application Window with Actions

The TQAction class provides a way of associating user input from different user interface elements with abstract high level actions. This approach makes it easy to customize applications for different types of users.

This example program is just like the application example, but uses TQAction to build the menu and the toolbar.

Header file:

    /****************************************************************************
    ** $Id: qt/application.h   3.3.8   edited Jan 11 14:36 $
    **
    ** Copyright (C) 1992-2007 Trolltech ASA.  All rights reserved.
    **
    ** This file is part of an example program for TQt.  This example
    ** program may be used, distributed and modified without limitation.
    **
    *****************************************************************************/

    #ifndef APPLICATION_H
    #define APPLICATION_H

    #include <tqmainwindow.h>

    class TQTextEdit;

    class ApplicationWindow: public TQMainWindow
    {
        TQ_OBJECT

    public:
        ApplicationWindow();
        ~ApplicationWindow();

    protected:
        void closeEvent( TQCloseEvent* );

    private slots:
        void newDoc();
        void choose();
        void load( const TQString &fileName );
        void save();
        void saveAs();
        void print();

        void about();
        void aboutTQt();

    private:
        TQPrinter *printer;
        TQTextEdit *e;
        TQString filename;
    };

    #endif

Implementation:

    /****************************************************************************
    ** $Id: qt/application.cpp   3.3.8   edited Jan 11 14:36 $
    **
    ** Copyright (C) 1992-2007 Trolltech ASA.  All rights reserved.
    **
    ** This file is part of an example program for TQt.  This example
    ** program may be used, distributed and modified without limitation.
    **
    *****************************************************************************/

    #include "application.h"

    #include <tqimage.h>
    #include <tqpixmap.h>
    #include <tqtoolbar.h>
    #include <tqtoolbutton.h>
    #include <tqpopupmenu.h>
    #include <tqmenubar.h>
    #include <tqtextedit.h>
    #include <tqfile.h>
    #include <tqfiledialog.h>
    #include <tqstatusbar.h>
    #include <tqmessagebox.h>
    #include <tqprinter.h>
    #include <tqapplication.h>
    #include <tqaccel.h>
    #include <tqtextstream.h>
    #include <tqpainter.h>
    #include <tqpaintdevicemetrics.h>
    #include <tqwhatsthis.h>
    #include <tqaction.h>
    #include <tqsimplerichtext.h>

    #include "filesave.xpm"
    #include "fileopen.xpm"
    #include "fileprint.xpm"

    ApplicationWindow::ApplicationWindow()
        : TQMainWindow( 0, "example application main window", WDestructiveClose )
    {
        printer = new TQPrinter( TQPrinter::HighResolution );

        TQAction * fileNewAction;
        TQAction * fileOpenAction;
        TQAction * fileSaveAction, * fileSaveAsAction, * filePrintAction;
        TQAction * fileCloseAction, * fileQuitAction;

        fileNewAction = new TQAction( "&New", CTRL+Key_N, this, "new" );
        connect( fileNewAction, TQ_SIGNAL( activated() ) , this,
                 TQ_SLOT( newDoc() ) );

        fileOpenAction = new TQAction( TQPixmap( fileopen ), "&Open...",
                                      CTRL+Key_O, this, "open" );
        connect( fileOpenAction, TQ_SIGNAL( activated() ) , this, TQ_SLOT( choose() ) );

        const char * fileOpenText = "<p><img source=\"fileopen\"> "
                         "Click this button to open a <em>new file</em>. <br>"
                         "You can also select the <b>Open</b> command "
                         "from the <b>File</b> menu.</p>";
        TQMimeSourceFactory::defaultFactory()->setPixmap( "document-open",
                              fileOpenAction->iconSet().pixmap() );
        fileOpenAction->setWhatsThis( fileOpenText );

        fileSaveAction = new TQAction( TQPixmap( filesave ),
                                      "&Save", CTRL+Key_S, this, "save" );
        connect( fileSaveAction, TQ_SIGNAL( activated() ) , this, TQ_SLOT( save() ) );

        const char * fileSaveText = "<p>Click this button to save the file you "
                         "are editing. You will be prompted for a file name.\n"
                         "You can also select the <b>Save</b> command "
                         "from the <b>File</b> menu.</p>";
        fileSaveAction->setWhatsThis( fileSaveText );

        fileSaveAsAction = new TQAction( "Save File As", "Save &As...", 0,  this,
                                        "save as" );
        connect( fileSaveAsAction, TQ_SIGNAL( activated() ) , this,
                 TQ_SLOT( saveAs() ) );
        fileSaveAsAction->setWhatsThis( fileSaveText );

        filePrintAction = new TQAction( "Print File", TQPixmap( fileprint ),
                                       "&Print...", CTRL+Key_P, this, "print" );
        connect( filePrintAction, TQ_SIGNAL( activated() ) , this,
                 TQ_SLOT( print() ) );

        const char * filePrintText = "Click this button to print the file you "
                         "are editing.\n You can also select the Print "
                         "command from the File menu.";
        filePrintAction->setWhatsThis( filePrintText );

        fileCloseAction = new TQAction( "Close", "&Close", CTRL+Key_W, this,
                                       "close" );
        connect( fileCloseAction, TQ_SIGNAL( activated() ) , this,
                 TQ_SLOT( close() ) );

        fileQuitAction = new TQAction( "Quit", "&Quit", CTRL+Key_Q, this,
                                      "quit" );
        connect( fileQuitAction, TQ_SIGNAL( activated() ) , tqApp,
                 TQ_SLOT( closeAllWindows() ) );

        // populate a tool bar with some actions

        TQToolBar * fileTools = new TQToolBar( this, "file operations" );
        fileTools->setLabel( "File Operations" );
        fileOpenAction->addTo( fileTools );
        fileSaveAction->addTo( fileTools );
        filePrintAction->addTo( fileTools );
        (void)TQWhatsThis::whatsThisButton( fileTools );

        // populate a menu with all actions

        TQPopupMenu * file = new TQPopupMenu( this );
        menuBar()->insertItem( "&File", file );
        fileNewAction->addTo( file );
        fileOpenAction->addTo( file );
        fileSaveAction->addTo( file );
        fileSaveAsAction->addTo( file );
        file->insertSeparator();
        filePrintAction->addTo( file );
        file->insertSeparator();
        fileCloseAction->addTo( file );
        fileQuitAction->addTo( file );

        menuBar()->insertSeparator();

        // add a help menu

        TQPopupMenu * help = new TQPopupMenu( this );
        menuBar()->insertItem( "&Help", help );
        help->insertItem( "&About", this, TQ_SLOT(about()), Key_F1 );
        help->insertItem( "About &TQt", this, TQ_SLOT(aboutTQt()) );
        help->insertSeparator();
        help->insertItem( "What's &This", this, TQ_SLOT(whatsThis()),
                          SHIFT+Key_F1 );

        // create and define the central widget

        e = new TQTextEdit( this, "editor" );
        e->setFocus();
        setCentralWidget( e );
        statusBar()->message( "Ready", 2000 );

        resize( 450, 600 );
    }

    ApplicationWindow::~ApplicationWindow()
    {
        delete printer;
    }

    void ApplicationWindow::newDoc()
    {
        ApplicationWindow *ed = new ApplicationWindow;
        ed->show();
    }

    void ApplicationWindow::choose()
    {
        TQString fn = TQFileDialog::getOpenFileName( TQString::null, TQString::null,
                                                   this);
        if ( !fn.isEmpty() )
            load( fn );
        else
            statusBar()->message( "Loading aborted", 2000 );
    }

    void ApplicationWindow::load( const TQString &fileName )
    {
        TQFile f( fileName );
        if ( !f.open( IO_ReadOnly ) )
            return;

        TQTextStream ts( &f );
        e->setText( ts.read() );
        e->setModified( false );
        setCaption( fileName );
        statusBar()->message( "Loaded document " + fileName, 2000 );
    }

    void ApplicationWindow::save()
    {
        if ( filename.isEmpty() ) {
            saveAs();
            return;
        }

        TQString text = e->text();
        TQFile f( filename );
        if ( !f.open( IO_WriteOnly ) ) {
            statusBar()->message( TQString("Could not write to %1").arg(filename),
                                  2000 );
            return;
        }

        TQTextStream t( &f );
        t << text;
        f.close();

        e->setModified( false );

        setCaption( filename );

        statusBar()->message( TQString( "File %1 saved" ).arg( filename ), 2000 );
    }

    void ApplicationWindow::saveAs()
    {
        TQString fn = TQFileDialog::getSaveFileName( TQString::null, TQString::null,
                                                   this );
        if ( !fn.isEmpty() ) {
            filename = fn;
            save();
        } else {
            statusBar()->message( "Saving aborted", 2000 );
        }
    }

    void ApplicationWindow::print()
    {
        printer->setFullPage( true );
        if ( printer->setup(this) ) {               // printer dialog
            statusBar()->message( "Printing..." );
            TQPainter p;
            if( !p.begin( printer ) ) {               // paint on printer
                statusBar()->message( "Printing aborted", 2000 );
                return;
            }

            TQPaintDeviceMetrics metrics( p.device() );
            int dpiy = metrics.logicalDpiY();
            int margin = (int) ( (2/2.54)*dpiy ); // 2 cm margins
            TQRect view( margin, margin, metrics.width() - 2*margin, metrics.height() - 2*margin );
            TQSimpleRichText richText( TQStyleSheet::convertFromPlainText(e->text()),
                                      TQFont(),
                                      e->context(),
                                      e->styleSheet(),
                                      e->mimeSourceFactory(),
                                      view.height() );
            richText.setWidth( &p, view.width() );
            int page = 1;
            do {
                richText.draw( &p, margin, margin, view, colorGroup() );
                view.moveBy( 0, view.height() );
                p.translate( 0 , -view.height() );
                p.drawText( view.right() - p.fontMetrics().width( TQString::number( page ) ),
                            view.bottom() + p.fontMetrics().ascent() + 5, TQString::number( page ) );
                if ( view.top() - margin >= richText.height() )
                    break;
                printer->newPage();
                page++;
            } while (true);

            statusBar()->message( "Printing completed", 2000 );
        } else {
            statusBar()->message( "Printing aborted", 2000 );
        }
    }

    void ApplicationWindow::closeEvent( TQCloseEvent* ce )
    {
        if ( !e->isModified() ) {
            ce->accept();
            return;
        }

        switch( TQMessageBox::information( this, "TQt Application Example",
                                          "The document has been changed since "
                                          "the last save.",
                                          "Save Now", "Cancel", "Leave Anyway",
                                          0, 1 ) ) {
        case 0:
            save();
            ce->accept();
            break;
        case 1:
        default: // just for sanity
            ce->ignore();
            break;
        case 2:
            ce->accept();
            break;
        }
    }

    void ApplicationWindow::about()
    {
        TQMessageBox::about( this, "TQt Application Example",
                            "This example demonstrates simple use of "
                            "TQMainWindow,\nTQMenuBar and TQToolBar.");
    }

    void ApplicationWindow::aboutTQt()
    {
        TQMessageBox::aboutTQt( this, "TQt Application Example" );
    }

Main:

    /****************************************************************************
    ** $Id: qt/main.cpp   3.3.8   edited Jan 11 14:36 $
    **
    ** Copyright (C) 1992-2007 Trolltech ASA.  All rights reserved.
    **
    ** This file is part of an example program for TQt.  This example
    ** program may be used, distributed and modified without limitation.
    **
    *****************************************************************************/

    #include <tqapplication.h>
    #include "application.h"

    int main( int argc, char ** argv ) {
        TQApplication a( argc, argv );
        ApplicationWindow * mw = new ApplicationWindow();
        mw->setCaption( "Document 1" );
        mw->show();
        a.connect( &a, TQ_SIGNAL(lastWindowClosed()), &a, TQ_SLOT(quit()) );
        return a.exec();
    }

See also TQAction Examples.