showimg.cpp

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.7平台上编译为嵌入式图形界面操作系统。

/**********************************************************************
** Copyright (C) 2000-2002 Trolltech AS.  All rights reserved.
**
** This file is part of the Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact [e-mail] if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

//
// Full-screen and rotation options contributed by Robert Wittams <[e-mail]>
//

#include "showimg.h"
#include "settingsdialog.h"

#include <qtopia/qpeapplication.h>
#include <qtopia/resource.h>
#include <qtopia/storage.h>
#include <qtopia/fileselector.h>
#include <qtopia/applnk.h>
#include <qtopia/qpemenubar.h>
#include <qtopia/qpetoolbar.h>
#include <qtopia/config.h>
#include <qwidgetstack.h>
#include <qaction.h>
#include <qfiledialog.h>
#include <qmessagebox.h>
#include <qpopupmenu.h>
#include <qlabel.h>
#include <qpainter.h>
#include <qapplication.h>
#include <qtimer.h>
#include <qcopchannel_qws.h>
#include <qtopia/docproperties.h>

//===========================================================================
/*
  Contains the scaled image area and the status label
*/

ImagePane::ImagePane( QWidget *parent ) : QWidget( parent ), vb(0)
{
    image = new ImageWidget( this );
    connect( image, SIGNAL( clicked() ), this, SIGNAL( clicked() ) );
    status = new QLabel( this );
    status->setFixedHeight( fontMetrics().height() + 4 );
    showStatus();
    imageWidth = imageHeight = 0;
}

void ImagePane::setPixmap( const QPixmap &pm )
{
    image->setPixmap( pm );
    image->repaint( false );
    imageWidth = pm.width();
    imageHeight = pm.height();
}

void ImagePane::showBusy()
{
    image->showBusy();
}


void ImagePane::showStatus()
{
    delete vb;
    vb = new QVBoxLayout( this );
    vb->addWidget( image );
    status->show();
    vb->addWidget( status );
}

void ImagePane::hideStatus()
{
    delete vb;
    vb = new QVBoxLayout( this );
    vb->addWidget( image );
    status->hide();
}

void ImagePane::keyPressEvent(QKeyEvent *e)
{
    emit keypress(e->key());
}

void ImagePane::closeEvent(QCloseEvent *e)
{
    e->ignore();
}

//===========================================================================
/*
  Draws the portion of the scaled pixmap that needs to be updated
*/

void ImageWidget::paintEvent( QPaintEvent *e )
{
    QPainter painter(this);

    painter.setClipRect(e->rect());
    painter.setBrush( black );
    painter.drawRect( 0, 0, width(), height() );

    if ( pixmap.size() != QSize( 0, 0 ) ) { // is an image loaded?
	painter.drawPixmap((width() - pixmap.width()) / 2,
	    (height() - pixmap.height()) / 2, pixmap);
    }
}

/*
  Shows a busy indicator
 */
void ImageWidget::showBusy()
{
    QPainter painter(this);
    painter.setBrush( white );
    QPixmap wait = Resource::loadPixmap( "wait" );
    int pw = wait.width();
    int ph = wait.height();
    int w = pw * 3/2;
    int h = ph * 3/2;
    painter.drawEllipse( 0, 0, w, h );
    painter.drawPixmap( (w-pw)/2+1, (h-ph)/2+1, wait  );
    
}


void ImageWidget::mouseReleaseEvent(QMouseEvent *)
{
    emit clicked();
}

//===========================================================================
/*
 The main window with toolbars and fileselector. The image pane is shown inside it.
*/

ImageViewer::ImageViewer( QWidget *parent, const char *name, int wFlags )
    : QMainWindow( parent, name, wFlags | Qt::WResizeNoErase ),
      filename( 0 ), 
      doc(NULL),
      bFromDocView( FALSE )
{
    setCaption( tr("Image Viewer") );
    setIcon( Resource::loadPixmap( "ImageViewer" ) );
    setBackgroundMode( PaletteButton );

    needPmScaled0 = TRUE;
    needPmScaled90 = TRUE;
    rotated90 = FALSE;
    isFullScreen = FALSE;

    setToolBarsMovable( FALSE );

    toolBar = new QPEToolBar( this );
    toolBar->setHorizontalStretchable( TRUE );

    menubar = new QPEMenuBar( toolBar );

    stack = new QWidgetStack( this );
    stack->setSizePolicy( QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding ) );
    setCentralWidget( stack );

    imagePanel = new ImagePane( stack );
    connect(imagePanel, SIGNAL(clicked()), this, SLOT(toggleFullscreen()));
    connect(imagePanel, SIGNAL(keypress(int)), this, SLOT(handleKeypress(int)));

    connect(this, SIGNAL(keypress(int)), this, SLOT(handleKeypress(int)));

    fileSelector = new FileSelector("image/*", stack, "fs", FALSE, FALSE);
    connect( fileSelector, SIGNAL( closeMe() ), this, SLOT( closeFileSelector() ) );
    connect( fileSelector, SIGNAL( fileSelected( const DocLnk &) ), this, SLOT( openFile( const DocLnk & ) ) );
    connect(fileSelector, SIGNAL(categoryChanged()), this, SLOT(docsChanged()));
    connect(fileSelector, SIGNAL(typeChanged()), this, SLOT(docsChanged()));

    edit = new QPopupMenu( menubar );
    QPopupMenu *view = new QPopupMenu( menubar );

    menubar->insertItem( tr("Image"), edit );
    menubar->insertItem( tr("View"), view );

    toolBar = new QPEToolBar( this );

    openAction = new QAction( tr( "Open" ), Resource::loadIconSet( "fileopen" ), QString::null, 0, this, 0 );
    connect( openAction, SIGNAL( activated() ), this, SLOT( open() ) );
    openAction->addTo( toolBar );
    openAction->addTo( edit );

    edit->insertSeparator();
    hflip_id = edit->insertItem(tr("Horizontal flip"), this, SLOT(hFlip()), 0);
    vflip_id = edit->insertItem(tr("Vertical flip"), this, SLOT(vFlip()), 0);

    flipAction = new QAction( tr( "Rotate 180" ), Resource::loadIconSet( "repeat" ), QString::null, 0, this, 0 );
    connect( flipAction, SIGNAL( activated() ), this, SLOT( rot180() ) );
    flipAction->addTo( toolBar );
    flipAction->addTo( edit );

    rotateAction = new QAction( tr( "Rotate 90"), Resource::loadIconSet( "rotate90" ), QString::null, 0, this, 0);
    connect( rotateAction, SIGNAL( activated() ), this, SLOT( rot90() ) );
    rotateAction->addTo( toolBar );
    rotateAction->addTo( edit );

    edit->insertSeparator();
    propAction = new QAction(tr("Properties..."), QIconSet(), QString::null, 0, this, 0);
    connect(propAction, SIGNAL( activated() ), this, SLOT(properties()));
    propAction->addTo(edit);
    //edit->insertItem(tr("Properties..."), this, SLOT(properties()), 0);

    fullscreenAction = new QAction( tr( "Fullscreen" ), Resource::loadIconSet( "fullscreen" ), QString::null, 0, this, 0 );
    connect( fullscreenAction, SIGNAL( activated() ), this, SLOT( fullScreen() ) );
    fullscreenAction->addTo( toolBar );
    fullscreenAction->addTo( view);

    slideAction = new QAction( tr( "Slide show" ), Resource::loadIconSet( "slideshow" ), QString::null, 0, this, 0 );
    slideAction->setToggleAction( TRUE );
    connect( slideAction, SIGNAL( toggled(bool) ), this, SLOT( slideShow(bool) ) );
    slideAction->addTo( view);
    slideAction->addTo( toolBar );
    slideAction->setEnabled( FALSE );

    prevImageAction = new QAction(tr("Previous"), Resource::loadIconSet("back"),
	QString::null, 0, this, 0);
    connect(prevImageAction, SIGNAL(activated()), this, SLOT(prevImage()));
    prevImageAction->addTo(toolBar);
    prevImageAction->addTo(view);

    nextImageAction = new QAction(tr("Next"), Resource::loadIconSet("forward"),
	QString::null, 0, this, 0);
    connect(nextImageAction, SIGNAL(activated()), this, SLOT(nextImage()));
    nextImageAction->addTo(toolBar);
    nextImageAction->addTo(view);

    view->insertSeparator();
    view->insertItem(tr("Settings..."), this, SLOT(settings()), 0);

    stack->raiseWidget( fileSelector );
    openAction->setEnabled( FALSE );

    setMouseTracking( TRUE );
    slideTimer = new QTimer( this );
    connect( slideTimer, SIGNAL(timeout()), this, SLOT(slideUpdate()) );

    Config config( "ImageViewer" );
    config.setGroup( "SlideShow" );
    slideDelay = config.readNumEntry( "Delay", 5 );
    slideRepeat = config.readBoolEntry( "Repeat", FALSE );
    slideReverse = config.readBoolEntry("Reverse", FALSE);

    config.setGroup("Default");
    rotateOnLoad = config.readBoolEntry("Rotate", FALSE);
    rotateClockwise = config.readBoolEntry("Clockwise", TRUE);
    fastLoad = config.readBoolEntry("FastLoad", TRUE);
    smallScale = config.readBoolEntry("SmallScale", FALSE);

    storage = new StorageInfo( this );
    connect(storage, SIGNAL(disksChanged()), this, SLOT(updateDocs()));
    connect(qApp, SIGNAL(linkChanged(const QString&)), this, SLOT(updateDocs()));

    setControls();
    updateDocs();
}

void ImageViewer::updateDocs()
{
    QTimer::singleShot(1000, this, SLOT(docsChanged()));
}

ImageViewer::~ImageViewer()
{
    if (doc != NULL) {
	delete doc;
    }

    if ( isFullScreen)
	delete imagePanel; // when fullScreen, it is reparented off the QWidgetStack
}

//
// Popup image properties dialog.
//
void
ImageViewer::properties(void)
{
    if (stack->visibleWidget() == fileSelector) {
	if (doc == NULL) {
	    doc = new DocLnk();
	}
	*doc = fileSelector->selectedDocument();
    }

    if (doc) {
	// pause slideshow if on
	bool on = slideTimer->isActive();
	if (on)
	    slideTimer->stop();

	DocPropertiesDialog *dp = new DocPropertiesDialog(doc, this);
	QPEApplication::execDialog( dp );
	delete dp;
	// if link is changed in the properties dialog,
	// we get a linkChanged message to handle

	if (on)
	    slideTimer->start(slideDelay * 1000, FALSE);
    }
}

void ImageViewer::docsChanged(void)
{
    // Avoid causing the fileSelector to scan until needed. It's okay if
    // we have already caused it to scan in which case imageList is not
    // empty, or we need it to scan because we are viewing the file selector.
    if ( fileSelector->isVisible() || !imageList.isEmpty() ) {
	imageList.clear();
	imageList = fileSelector->fileList();
	setControls();
    }
}

void ImageViewer::settings()
{
    SettingsDialog dlg( this, 0, TRUE );
    dlg.setDelay( slideDelay );
    dlg.setRepeat( slideRepeat );
    dlg.setReverse( slideReverse );
    dlg.setRotate(rotateOnLoad);
    dlg.setClockwise(rotateClockwise);
    dlg.setFastLoad(fastLoad);
    dlg.setSmallScale(smallScale);

    if ( QPEApplication::execDialog(&dlg) == QDialog::Accepted ) {
	slideDelay = dlg.delay();
	slideRepeat = dlg.repeat();
	slideReverse = dlg.reverse();
	rotateOnLoad = dlg.rotate();
        rotateClockwise = dlg.clockwise();
	fastLoad = dlg.fastLoad();
	smallScale = dlg.smallScale();

	Config config( "ImageViewer" );
	config.setGroup( "SlideShow" );
	config.writeEntry( "Delay", slideDelay );
	config.writeEntry( "Repeat", slideRepeat );
	config.writeEntry("Reverse", slideReverse);

	config.setGroup("Default");
	config.writeEntry("Clockwise", rotateClockwise);
	config.writeEntry("Rotate", rotateOnLoad);
	config.writeEntry("FastLoad", fastLoad);
	config.writeEntry("SmallScale", smallScale);
    }

    //
    // Reload current image in case viewing options have changed.
    //
    if (stack->visibleWidget() != fileSelector) {
	loadFilename(filename);
    }
}

void ImageViewer::setDocument(const QString& fileref)
{
    bFromDocView = TRUE;
    DocLnk link( fileref );

    delete doc;
    doc = new DocLnk(fileref);

    if ( link.isValid() )
	openFile( link.name(), link.file() );
    else
	openFile( fileref, fileref );
}

void ImageViewer::show()
{
    QMainWindow::show();
    normalView();
}

void ImageViewer::openFile( const DocLnk &file )
{
    delete doc;
    doc = new DocLnk(file);

    openFile( file.name(), file.file() );
}

void ImageViewer::openFile( const QString &name, const QString &file )
{
    if (stack->visibleWidget() == fileSelector) {
	imagePanel->setPixmap(QPixmap());
    }

    closeFileSelector();
    updateCaption( name );
    loadFilename( file );
    setControls();

    if (slideTimer->isActive()) {
	slideTimer->start(slideDelay * 1000, FALSE);
    }

}

void ImageViewer::open()
{
    slideAction->setOn( FALSE );
    stack->raiseWidget(fileSelector);
    fileSelector->setFocus();
    openAction->setEnabled( FALSE );
    updateCaption();
    updateDocs();
}

void ImageViewer::closeFileSelector()
{
    stack->raiseWidget(imagePanel);
    openAction->setEnabled( TRUE );
}

void ImageViewer::updateCaption( QString name )
{
    if ( name.isEmpty() || stack->visibleWidget() == fileSelector ) {
	setCaption( tr("Image Viewer") );
    } else {
	int sep = name.findRev( '/' );
	if ( sep >= 0 )
	    name = name.mid( sep+1 );
	setCaption( name + tr(" - Image Viewer") );
    }
}

void ImageViewer::loadFilename( const QString &file ) {
    if ( file ) {
	filename = file;
	if ( !slideTimer->isActive() )
	    imagePanel->showBusy();

	imagePanel->statusLabel()->setText( tr("Loading image...") );
	qApp->processEvents();

	QString	param;
	QImageIO iio;

	iio.setFileName(filename);

	iio.setParameters("GetHeaderInformation");