mainframe.cpp

用QT设计的手持设备PDF阅读器。实现了阅读

#include "mainframe.h"

Mainframe::Mainframe(QWidget * parent, Qt::WindowFlags f)
	: QMainWindow(parent, f)
{
	setupUi(this);
	
	scrollArea = new QScrollArea(centralwidget);
	scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
	scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
	scrollArea->setWidget(pdfviewer);
	//scrollArea->setWidgetResizable(true); 
	gridLayout = new QGridLayout(centralwidget);
	gridLayout->addWidget(scrollArea, 0, 0, 1, 1);
	
	createWidgets();
}

void Mainframe::createWidgets()
{
	lineEdit = new QLineEdit(centralwidget);
    lineEdit->setObjectName(QString::fromUtf8("lineEdit"));
	lineEdit->setFixedWidth(30);
	lineEdit->setText(QString::number(0));
	//lineEdit->show();

	label = new QLabel(centralwidget);
    label->setObjectName(QString::fromUtf8("label"));
	label->show();

	toolBar_2->insertWidget(actionFirst,lineEdit);
	toolBar_2->insertWidget(actionFirst,label);
		
    sceneScaleCombo = new QComboBox;
    QStringList scales;
    scales << tr("50%") << tr("75%") << tr("100%") << tr("125%") << tr("150%");
    sceneScaleCombo->addItems(scales);
    sceneScaleCombo->setCurrentIndex(2);
    connect(sceneScaleCombo, SIGNAL(currentIndexChanged(const QString &)),
            this, SLOT(sceneScaleChanged(const QString &)));

	toolBar_3->insertWidget(actionRight,sceneScaleCombo);

	connect(actionOpen, SIGNAL(triggered()), this, SLOT(open()));
	connect(actionSave, SIGNAL(triggered()), this, SLOT(save()));
	connect(actionPrint, SIGNAL(triggered()), this, SLOT(print()));
	connect(actionUp, SIGNAL(triggered()), this, SLOT(turnup()));
	connect(actionDown, SIGNAL(triggered()), this, SLOT(turndown()));
	connect(actionFirst, SIGNAL(triggered()), this, SLOT(firstpage()));
	connect(actionLast, SIGNAL(triggered()), this, SLOT(lastpage()));
	connect(actionBig, SIGNAL(triggered()), this, SLOT(zoomIn()));
	connect(actionSmall, SIGNAL(triggered()), this, SLOT(zoomOut()));
	connect(actionAbout, SIGNAL(triggered()), this, SLOT(about()));
}

bool Mainframe::open()
{
	QString filename = QFileDialog::getOpenFileName(this,
                                     tr("Open File"), QDir::currentPath());
	// TODO
	if(filename.isEmpty()){
		qDebug()<<"No file"<<filename;
		return false;
	}
	else {
		pdfviewer->OpenDocument(filename);
		pagenum = 0;
		allnum = pdfviewer->allPageNum();
		label->setText("/"+QString::number(allnum));
		scaleFactor = 1.0;
	}
		return true;
}

void Mainframe::save()
{
	QAction *action = qobject_cast<QAction *>(sender());
	QByteArray fileFormat = action->data().toByteArray();
	saveFile(fileFormat);
}

bool Mainframe::saveFile(const QByteArray &fileFormat)
{
	QString initialPath = QDir::currentPath() + "/untitled." + fileFormat;

	QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),
                                initialPath,
                                tr("%1 Files (*.%2);;All Files (*)")
                                .arg(QString(fileFormat.toUpper()))
                                .arg(QString(fileFormat)));
	if (fileName.isEmpty()){
		return false;
	} else {
		return saveImage(fileName, fileFormat);
	}
} 

bool Mainframe::saveImage(const QString &fileName, const char *fileFormat)
{
    QImage visibleImage = image;
    resizeImage(&visibleImage, size());

    if (visibleImage.save(fileName, fileFormat)) {
        //modified = false;
        return true;
    } else {
        return false;
    }
}

void Mainframe::resizeImage(QImage *image, const QSize &newSize)
{
    if (image->size() == newSize)
        return;

    QImage newImage(newSize, QImage::Format_RGB32);
    newImage.fill(qRgb(255, 255, 255));
    QPainter painter(&newImage);
    painter.drawImage(QPoint(0, 0), *image);
    *image = newImage;
}

void Mainframe::about()
{
	QMessageBox::about(this, tr("About 	PDF"),
            tr("<p>The <b>Scribble</b> This software is for PDF view and editor "
               "base widget for an application, and how to reimplement some of "
               "QWidget's event handlers to receive the events generated for "
               "the application's widgets:</p><p> We reimplement the mouse event "
               "handlers to facilitate drawing, the paint event handler to "
               "update the application and the resize event handler to optimize "
               "the application's appearance. In addition we reimplement the "
               "close event handler to intercept the close events before "
               "terminating the application.</p><p> The example also demonstrates "
               "how to use QPainter to draw an image in real time, as well as "
               "to repaint widgets.</p>"));
}

void Mainframe::print()
{
    Q_ASSERT(pdfviewer->pixmap());
    QPrintDialog dialog(&printer, this);
    if (dialog.exec()) {
        QPainter painter(&printer);
        QRect rect = painter.viewport();
        QSize size = pdfviewer->pixmap()->size();
        size.scale(rect.size(), Qt::KeepAspectRatio);
        painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
        painter.setWindow(pdfviewer->pixmap()->rect());
        painter.drawPixmap(0, 0, *pdfviewer->pixmap());
    }
}

void Mainframe::sceneScaleChanged(const QString &scale)
{
    double newScale = scale.left(scale.indexOf(tr("%"))).toDouble() / 100.0;
    QMatrix oldMatrix = view->matrix();
    view->resetMatrix();
    view->translate(oldMatrix.dx(), oldMatrix.dy());
    view->scale(newScale, newScale);
}

void Mainframe::turnup()
{
	if(pagenum>0)
		pagenum--;
	pdfviewer->showpage(pagenum);
	lineEdit->setText(QString::number(pagenum));
}

void Mainframe::turndown()
{
	if(pagenum<200)
		pagenum++;
	pdfviewer->showpage(pagenum);
	lineEdit->setText(QString::number(pagenum));
	//lineEdit->show();
}

void Mainframe::firstpage()
{
	pdfviewer->showpage(0);
	lineEdit->setText(QString::number(0));
}

void Mainframe::lastpage()
{
	pdfviewer->showpage(allnum = pdfviewer->allPageNum()-1);
	lineEdit->setText(QString::number(allnum));
}

void Mainframe::zoomIn()
{
	QPainter painter(&(pdfviewer->pixmap1));
	QMatrix matrix;
	matrix.scale(2,2);
	painter.setWorldMatrix(matrix, true);
    //scaleImage(1.25);
}

void Mainframe::zoomOut()
{
	//QPainter painter(pdfviewer);
	//painter.scale(0.5,0.5);
    scaleImage(0.8);
}

void Mainframe::scaleImage(double factor)
{
    Q_ASSERT(pdfviewer->pixmap());
    scaleFactor *= factor;
    pdfviewer->resize(scaleFactor * pdfviewer->pixmap()->size());

    adjustScrollBar(scrollArea->horizontalScrollBar(), factor);
    adjustScrollBar(scrollArea->verticalScrollBar(), factor);

    actionBig->setEnabled(scaleFactor < 3.0);
    actionSmall->setEnabled(scaleFactor > 0.333);

	pdfviewer->update();
}

void Mainframe::adjustScrollBar(QScrollBar *scrollBar, double factor)
{
    scrollBar->setValue(int(factor * scrollBar->value()
                            + ((factor - 1) * scrollBar->pageStep()/2)));
}