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# QDir

Main:

    /****************************************************************************
    ** $Id: qt/qdir.cpp   3.3.8   edited Jan 11 14:37 $
    **
    ** Copyright (C) 1992-2007 Trolltech ASA.  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 "../dirview/dirview.h"
    #include "qdir.h"

    #include <qapplication.h>
    #include <qtextview.h>
    #include <qfileinfo.h>
    #include <qfile.h>
    #include <qtextstream.h>
    #include <qhbox.h>
    #include <qspinbox.h>
    #include <qlabel.h>
    #include <qmultilineedit.h>
    #include <qheader.h>
    #include <qevent.h>
    #include <qpainter.h>
    #include <qpopupmenu.h>
    #include <qpushbutton.h>
    #include <qtoolbutton.h>
    #include <qfile.h>
    #include <qtextstream.h>
    #include <qtooltip.h>

    #include <stdlib.h>

    /* XPM */
    static const char *bookmarks[]={
        "22 14 8 1",
        "# c #000080",
        "a c #585858",
        "b c #000000",
        "c c #ffffff",
        "d c #ffffff",
        "e c #ffffff",
        "f c #000000",
        ". c None",
        "...bb.................",
        "..bacb....bbb.........",
        "..badcb.bbccbab.......",
        "..bacccbadccbab.......",
        "..baecdbcccdbab.......",
        "..bacccbacccbab.......",
        "..badcdbcecdfab.......",
        "..bacecbacccbab.......",
        "..baccdbcccdbab.......",
        "...badcbacdbbab.......",
        "....bacbcbbccab.......",
        ".....babbaaaaab.......",
        ".....bbabbbbbbb.......",
        "......bb.............."
    };

    /* XPM */
    static const char *home[]={
        "16 15 4 1",
        "# c #000000",
        "a c #ffffff",
        "b c #c0c0c0",
        ". c None",
        ".......##.......",
        "..#...####......",
        "..#..#aabb#.....",
        "..#.#aaaabb#....",
        "..##aaaaaabb#...",
        "..#aaaaaaaabb#..",
        ".#aaaaaaaaabbb#.",
        "###aaaaaaaabb###",
        "..#aaaaaaaabb#..",
        "..#aaa###aabb#..",
        "..#aaa#.#aabb#..",
        "..#aaa#.#aabb#..",
        "..#aaa#.#aabb#..",
        "..#aaa#.#aabb#..",
        "..#####.######.."
    };

    // ****************************************************************************************************

    PixmapView::PixmapView( QWidget *parent )
        : QScrollView( parent )
    {
        viewport()->setBackgroundMode( PaletteBase );
    }

    void PixmapView::setPixmap( const QPixmap &pix )
    {
        pixmap = pix;
        resizeContents( pixmap.size().width(), pixmap.size().height() );
        viewport()->repaint( FALSE );
    }

    void PixmapView::drawContents( QPainter *p, int cx, int cy, int cw, int ch )
    {
        p->fillRect( cx, cy, cw, ch, colorGroup().brush( QColorGroup::Base ) );
        p->drawPixmap( 0, 0, pixmap );
    }

    // ****************************************************************************************************

    Preview::Preview( QWidget *parent )
        : QWidgetStack( parent )
    {
        normalText = new QMultiLineEdit( this );
        normalText->setReadOnly( TRUE );
        html = new QTextView( this );
        pixmap = new PixmapView( this );
        raiseWidget( normalText );
    }

    void Preview::showPreview( const QUrl &u, int size )
    {
        if ( u.isLocalFile() ) {
            QString path = u.path();
            QFileInfo fi( path );
            if ( fi.isFile() && (int)fi.size() > size * 1000 ) {
                normalText->setText( tr( "The File\n%1\nis too large, so I don't show it!" ).arg( path ) );
                raiseWidget( normalText );
                return;
            }

            QPixmap pix( path );
            if ( pix.isNull() ) {
                if ( fi.isFile() ) {
                    QFile f( path );
                    if ( f.open( IO_ReadOnly ) ) {
                        QTextStream ts( &f );
                        QString text = ts.read();
                        f.close();
                        if ( fi.extension().lower().contains( "htm" ) ) {
                            QString url = html->mimeSourceFactory()->makeAbsolute( path, html->context() );
                            html->setText( text, url );
                            raiseWidget( html );
                            return;
                        } else {
                            normalText->setText( text );
                            raiseWidget( normalText );
                            return;
                        }
                    }
                }
                normalText->setText( QString::null );
                raiseWidget( normalText );
            } else {
                pixmap->setPixmap( pix );
                raiseWidget( pixmap );
            }
        } else {
            normalText->setText( "I only show local files!" );
            raiseWidget( normalText );
        }
    }

    // ****************************************************************************************************

    PreviewWidget::PreviewWidget( QWidget *parent )
        : QVBox( parent ), QFilePreview()
    {
        setSpacing( 5 );
        setMargin( 5 );
        QHBox *row = new QHBox( this );
        row->setSpacing( 5 );
        (void)new QLabel( tr( "Only show files smaller than: " ), row );
        sizeSpinBox = new QSpinBox( 1, 10000, 1, row );
        sizeSpinBox->setSuffix( " KB" );
        sizeSpinBox->setValue( 64 );
        row->setFixedHeight( 10 + sizeSpinBox->sizeHint().height() );
        preview = new Preview( this );
    }

    void PreviewWidget::previewUrl( const QUrl &u )
    {
        preview->showPreview( u, sizeSpinBox->value() );
    }

    // ****************************************************************************************************

    CustomFileDialog::CustomFileDialog()
        :  QFileDialog( 0, 0, TRUE )
    {
        setDir( "/" );

        dirView = new DirectoryView( this, 0, TRUE );
        dirView->addColumn( "" );
        dirView->header()->hide();
        ::Directory *root = new ::Directory( dirView, "/" );
        root->setOpen( TRUE );
        dirView->setFixedWidth( 150 );

        addLeftWidget( dirView );

        QPushButton *p = new QPushButton( this );
        p->setPixmap( QPixmap( bookmarks ) );
        QToolTip::add( p, tr( "Bookmarks" ) );

        bookmarkMenu = new QPopupMenu( this );
        connect( bookmarkMenu, SIGNAL( activated( int ) ),
                 this, SLOT( bookmarkChosen( int ) ) );
        addId = bookmarkMenu->insertItem( tr( "Add bookmark" ) );
        bookmarkMenu->insertSeparator();

        QFile f( ".bookmarks" );
        if ( f.open( IO_ReadOnly ) ) {
            QDataStream ds( &f );
            ds >> bookmarkList;
            f.close();

            QStringList::Iterator it = bookmarkList.begin();
            for ( ; it != bookmarkList.end(); ++it ) {
                bookmarkMenu->insertItem( *it );
            }
        }

        p->setPopup( bookmarkMenu );

        addToolButton( p, TRUE );

        connect( dirView, SIGNAL( folderSelected( const QString & ) ),
                 this, SLOT( setDir2( const QString & ) ) );
        connect( this, SIGNAL( dirEntered( const QString & ) ),
                 dirView, SLOT( setDir( const QString & ) ) );

        QToolButton *b = new QToolButton( this );
        QToolTip::add( b, tr( "Go Home!" ) );
        b->setPixmap( QPixmap( home ) );
        connect( b, SIGNAL( clicked() ),
                 this, SLOT( goHome() ) );

        addToolButton( b );

        resize( width() + width() / 3, height() );
    }

    CustomFileDialog::~CustomFileDialog()
    {
        if ( !bookmarkList.isEmpty() ) {
            QFile f( ".bookmarks" );
            if ( f.open( IO_WriteOnly ) ) {
                QDataStream ds( &f );
                ds << bookmarkList;
                f.close();
            }
        }
    }

    void CustomFileDialog::setDir2( const QString &s )
    {
        blockSignals( TRUE );
        setDir( s );
        blockSignals( FALSE );
    }

    void CustomFileDialog::showEvent( QShowEvent *e )
    {
        QFileDialog::showEvent( e );
        dirView->setDir( dirPath() );
    }

    void CustomFileDialog::bookmarkChosen( int i )
    {
        if ( i == addId ) {
            bookmarkList << dirPath();
            bookmarkMenu->insertItem( dirPath() );
        } else {
            setDir( bookmarkMenu->text( i ) );
        }
    }

    void CustomFileDialog::goHome()
    {
        if ( getenv( "HOME" ) )
            setDir( getenv( "HOME" ) );
        else
            setDir( "/" );
    }

    // ****************************************************************************************************

    int main( int argc, char ** argv )
    {
        QFileDialog::Mode mode = QFileDialog::ExistingFile;
        QString start;
        QString filter;
        QString caption;
        bool preview = FALSE;
        bool custom = FALSE;
        QApplication a( argc, argv );
        for (int i=1; i<argc; i++) {
            QString arg = argv[i];
            if ( arg == "-any" )
                mode = QFileDialog::AnyFile;
            else if ( arg == "-dir" )
                mode = QFileDialog::Directory;
            else if ( arg == "-default" )
                start = argv[++i];
            else if ( arg == "-filter" )
                filter = argv[++i];
            else if ( arg == "-preview" )
                preview = TRUE;
            else if ( arg == "-custom" )
                custom = TRUE;
            else if ( arg[0] == '-' ) {
                qDebug("Usage: qdir [-any | -dir | -custom] [-preview] [-default f] {-filter f} [caption ...]\n"
                       "      -any         Get any filename, need not exist.\n"
                       "      -dir         Return a directory rather than a file.\n"
                       "      -custom      Opens a customized QFileDialog with \n"
                       "                   dir browser, bookmark menu, etc.\n"
                       "      -preview     Show a preview widget.\n"
                       "      -default f   Start from directory/file f.\n"
                       "      -filter f    eg. '*.gif' '*.bmp'\n"
                       "      caption ...  Caption for dialog.\n"
                       );
                return 1;
            } else {
                if ( !caption.isNull() )
                    caption += ' ';
                caption += arg;
            }
        }

        if ( !start )
            start = QDir::currentDirPath();

        if ( !caption )
            caption = mode == QFileDialog::Directory
                        ? "Choose directory..." : "Choose file...";

        if ( !custom ) {
            QFileDialog fd( QString::null, filter, 0, 0, TRUE );
            fd.setMode( mode );
            if ( preview ) {
                fd.setContentsPreviewEnabled( TRUE );
                PreviewWidget *pw = new PreviewWidget( &fd );
                fd.setContentsPreview( pw, pw );
                fd.setViewMode( QFileDialog::List );
                fd.setPreviewMode( QFileDialog::Contents );
            }
            fd.setCaption( caption );
            fd.setSelection( start );
            if ( fd.exec() == QDialog::Accepted ) {
                QString result = fd.selectedFile();
                printf("%s\n", (const char*)result);
                return 0;
            } else {
                return 1;
            }
        } else {
            CustomFileDialog fd;
            fd.exec();
            return 1;
        }
    }

See also Examples.