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helpwindow.cpp

/****************************************************************************
** $Id: helpwindow.cpp,v 1.2 2004/06/08 20:39:37 bherger Exp $
**
** Copyright (C) 1992-2000 Trolltech 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 "helpwindow.h"
#include "defs.h"
#include <qstatusbar.h>
#include <qpixmap.h>
#include <qpopupmenu.h>
#include <qmenubar.h>
#include <qtoolbar.h>
#include <qtoolbutton.h>
#include <qiconset.h>
#include <qfile.h>
#include <qtextstream.h>
#include <qstylesheet.h>
#include <qmessagebox.h>
#include <qfiledialog.h>
#include <qapplication.h>
#include <qcombobox.h>
#include <qevent.h>
#include <qlineedit.h>
#include <qobjectlist.h>
#include <qfileinfo.h>
#include <qfile.h>
#include <qdatastream.h>
#include <qprinter.h>
#include <qsimplerichtext.h>
#include <qpainter.h>
#include <qpaintdevicemetrics.h>

#include <ctype.h>

#include "defs.h"
#include "back.xpm"
#include "forward.xpm"
#include "home.xpm"

HelpWindow::HelpWindow( const QString& home_, const QString& _path,
                  QWidget* parent, const char *name )
    : QMainWindow( parent, name, WDestructiveClose ),
      pathCombo( 0 ), selectedURL()
{
    browser = new QTextBrowser( this );

    browser->mimeSourceFactory()->setFilePath( _path );
    browser->setFrameStyle( QFrame::Panel | QFrame::Sunken );
    connect( browser, SIGNAL( textChanged() ),
           this, SLOT( textChanged() ) );

    setCentralWidget( browser );

    if ( !home_.isEmpty() )
      browser->setSource( home_ );

    connect( browser, SIGNAL( highlighted( const QString&) ),
           statusBar(), SLOT( message( const QString&)) );

    resize( 640,700 );

    QPopupMenu* file = new QPopupMenu( this );
    file->insertItem( tr("&Print"), this, SLOT( print() ), CTRL+Key_P );
    file->insertSeparator();
    file->insertItem( tr("&Close"), this, SLOT( close() ), CTRL+Key_W );

    // The same three icons are used twice each.
    QIconSet icon_back( QPixmap(RingDir + "back.xpm") );
    QIconSet icon_forward( QPixmap(RingDir + "forward.xpm") );
    QIconSet icon_home( QPixmap(RingDir + "home.xpm") );

    QPopupMenu* go = new QPopupMenu( this );
    backwardId = go->insertItem( icon_back,
                         tr("&Backward"), browser, SLOT( backward() ),
                         CTRL+Key_Left );
    forwardId = go->insertItem( icon_forward,
                        tr("&Forward"), browser, SLOT( forward() ),
                        CTRL+Key_Right );
    go->insertItem( icon_home, tr("&Home"), browser, SLOT( home() ) );

    QPopupMenu* help = new QPopupMenu( this );
    help->insertItem( tr("&About ..."), this, SLOT( about() ) );

    menuBar()->insertItem( tr("&File"), file );
    menuBar()->insertItem( tr("&Go"), go );
    menuBar()->insertSeparator();
    menuBar()->insertItem( tr("&Help"), help );

    menuBar()->setItemEnabled( forwardId, FALSE);
    menuBar()->setItemEnabled( backwardId, FALSE);
    connect( browser, SIGNAL( backwardAvailable( bool ) ),
           this, SLOT( setBackwardAvailable( bool ) ) );
    connect( browser, SIGNAL( forwardAvailable( bool ) ),
           this, SLOT( setForwardAvailable( bool ) ) );


    QToolBar* toolbar = new QToolBar( this );
    addDockWindow( toolbar, "Toolbar");
    QToolButton* button;

    button = new QToolButton( icon_back, tr("Backward"), "", browser, SLOT(backward()), toolbar );
    connect( browser, SIGNAL( backwardAvailable(bool) ), button, SLOT( setEnabled(bool) ) );
    button->setEnabled( FALSE );
    button = new QToolButton( icon_forward, tr("Forward"), "", browser, SLOT(forward()), toolbar );
    connect( browser, SIGNAL( forwardAvailable(bool) ), button, SLOT( setEnabled(bool) ) );
    button->setEnabled( FALSE );
    button = new QToolButton( icon_home, tr("Home"), "", browser, SLOT(home()), toolbar );

    toolbar->addSeparator();

    pathCombo = new QComboBox( TRUE, toolbar );
    connect( pathCombo, SIGNAL( activated( const QString & ) ),
           this, SLOT( pathSelected( const QString & ) ) );
    toolbar->setStretchableWidget( pathCombo );
    setRightJustification( TRUE );
#if QT_VERSION >= 300
    setDockEnabled( DockLeft, FALSE );
    setDockEnabled( DockRight, FALSE );
#endif

    pathCombo->insertItem( home_ );
    browser->setFocus();

}


void HelpWindow::setBackwardAvailable( bool b)
{
    menuBar()->setItemEnabled( backwardId, b);
}

void HelpWindow::setForwardAvailable( bool b)
{
    menuBar()->setItemEnabled( forwardId, b);
}


void HelpWindow::textChanged()
{
    if ( browser->documentTitle().isNull() )
      setCaption( QString(XDC_VERSION) + " - Help viewer - " + browser->context() );
    else
      setCaption( QString(XDC_VERSION) + " - Help viewer - " + browser->documentTitle() ) ;

    selectedURL = browser->context();

    if ( !selectedURL.isEmpty() && pathCombo ) {
      bool exists = FALSE;
      int i;
      for ( i = 0; i < pathCombo->count(); ++i ) {
          if ( pathCombo->text( i ) == selectedURL ) {
            exists = TRUE;
            break;
          }
      }
      if ( !exists ) {
          pathCombo->insertItem( selectedURL, 0 );
          pathCombo->setCurrentItem( 0 );
      } else
          pathCombo->setCurrentItem( i );
      selectedURL = QString::null;
    }
}

HelpWindow::~HelpWindow()
{

}

void HelpWindow::about()
{
    QMessageBox::about( this, "HelpViewer Example",
                  "<p>This example implements a simple HTML help viewer "
                  "using Qt's rich text capabilities</p>"
                  "<p>It's just about 100 lines of C++ code, so don't expect too much :-)</p>"
                  );
}

void HelpWindow::print()
{
#ifndef QT_NO_PRINTER
    QPrinter printer;
    printer.setFullPage(TRUE);
    if ( printer.setup( this ) ) {
      QPainter p( &printer );
      QPaintDeviceMetrics metrics(p.device());
      int dpix = metrics.logicalDpiX();
      int dpiy = metrics.logicalDpiY();
      const int margin = 72; // pt
      QRect body(margin*dpix/72, margin*dpiy/72,
               metrics.width()-margin*dpix/72*2,
               metrics.height()-margin*dpiy/72*2 );
      QSimpleRichText richText( browser->text(), QFont(), browser->context(), browser->styleSheet(),
                          browser->mimeSourceFactory(), body.height() );
      richText.setWidth( &p, body.width() );
      QRect view( body );
      int page = 1;
      do {
          richText.draw( &p, body.left(), body.top(), view, colorGroup() );
          view.moveBy( 0, body.height() );
          p.translate( 0 , -body.height() );
          p.drawText( view.right() - p.fontMetrics().width( QString::number(page) ),
                  view.bottom() + p.fontMetrics().ascent() + 5, QString::number(page) );
          if ( view.top()  >= richText.height() )
            break;
          printer.newPage();
          page++;
      } while (TRUE);
    }
#endif
}

void HelpWindow::pathSelected( const QString &_path )
{
    browser->setSource( _path );
}

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