#include <QMessageBox>
#include <QHeaderView>
#include <QScrollBar>
#include <QImageReader>
#include "ImageViewer.h"
ImageViewer::ImageViewer(QWidget *parent)
: QMainWindow(parent), scaleFactor(1)
{
setupUi(this);
imageLabel = new QLabel;
imageLabel->setBackgroundRole(QPalette::Base);
imageLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
imageLabel->setScaledContents(true);
scrollArea = new QScrollArea;
scrollArea->setBackgroundRole(QPalette::Dark);
scrollArea->setWidget(imageLabel);
setCentralWidget(scrollArea);
dirModel = new QDirModel(this);
dirModel->setFilter(QDir::Dirs | QDir::Drives);
dirCurrent = new QDir();
imageInfo = new QLabel(this);
imageInfo->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Expanding);
imageInfo->setAlignment(Qt::AlignCenter);
imageInfo->setStatusTip(tr("Display image infomation in the selected folder"));
toolBar->addWidget(imageInfo);
treeView->setModel(dirModel);
treeView->header()->setVisible(false);
treeView->setColumnHidden(1,true); // Size
treeView->setColumnHidden(2,true); // Type
treeView->setColumnHidden(3,true); // Modified Date
foreach (QByteArray ba, QImageReader::supportedImageFormats())
{
QString ext = QString("*.")+QString(ba);
supportFormat<<ext;
}
resize(780,580);
currentFile = displayFiles.constBegin();
UpdateUI();
}
ImageViewer::~ImageViewer()
{
delete dirCurrent;
}
void adjustScrollBar(QScrollBar *scrollBar, double factor)
{
scrollBar->setValue(int(factor * scrollBar->value()
+ ((factor - 1) * scrollBar->pageStep()/2)));
}
void ImageViewer::scaleImage(double factor)
{
Q_ASSERT(imageLabel->pixmap());
scaleFactor *= factor;
imageLabel->resize(scaleFactor * imageLabel->pixmap()->size());
adjustScrollBar(scrollArea->horizontalScrollBar(), factor);
adjustScrollBar(scrollArea->verticalScrollBar(), factor);
}
void ImageViewer::DisplayImage(const QString &fileName)
{
QImage image(fileName);
if (image.isNull()) {
QMessageBox::information(this, tr("Image Viewer"),
tr("Cannot load %1.").arg(fileName));
return;
}
imageLabel->setPixmap(QPixmap::fromImage(image));
scaleImage(1.0);
}
void ImageViewer::UpdateUI()
{
if(currentFile == displayFiles.constEnd())
{
imageInfo->setText(tr("No Images, Click TreeView to select pic folder"));
actionNext->setEnabled(false);
actionPrevious->setEnabled(false);
actionZoomIn->setEnabled(false);
actionZoomOut->setEnabled(false);
actionNormalSize->setEnabled(false);
}
else
{
int i = displayFiles.indexOf(*currentFile, 0) + 1; // non-Programmer count from 1 instead 0
imageInfo->setText(QString(tr("%1/%2 %3 %4%")).arg(i).arg(displayFiles.size()).arg(*currentFile).arg(scaleFactor*100, 3));
actionNext->setEnabled(true);
actionPrevious->setEnabled(true);
actionZoomIn->setEnabled(true);
actionZoomOut->setEnabled(true);
actionNormalSize->setEnabled(true);
}
actionZoomIn->setEnabled(scaleFactor < 3.0);
actionZoomOut->setEnabled(scaleFactor > 0.333);
}
void ImageViewer::on_actionNext_triggered()
{
currentFile++;
if(currentFile == displayFiles.constEnd())
currentFile = displayFiles.constBegin();
DisplayImage(dirCurrent->absoluteFilePath(*currentFile));
UpdateUI();
}
void ImageViewer::on_actionPrevious_triggered()
{
if(currentFile == displayFiles.constBegin())
currentFile = displayFiles.constEnd();
currentFile--;
DisplayImage(dirCurrent->absoluteFilePath(*currentFile));
UpdateUI();
}
void ImageViewer::on_actionZoomOut_triggered()
{
scaleImage(0.8);
UpdateUI();
}
void ImageViewer::on_actionZoomIn_triggered()
{
scaleImage(1.25);
UpdateUI();
}
void ImageViewer::on_actionNormalSize_triggered()
{
scaleFactor = 1.0;
scaleImage(1.0);
UpdateUI();
}
void ImageViewer::on_treeView_clicked ( const QModelIndex &index )
{
const QString path = dirModel->data(index, QDirModel::FilePathRole).toString();
dirCurrent->setPath(path);
displayFiles = dirCurrent->entryList(supportFormat, QDir::Files);
currentFile = displayFiles.constBegin();
if(currentFile != displayFiles.constEnd())
DisplayImage(dirCurrent->absoluteFilePath(*currentFile));
UpdateUI();
}
const char *htmlAboutText =
"<HTML>"
"<p>This program is subject to GPL license.</p>"
"<p>Writed by Eric Guo</p>"
"<p><a href=\"http://ericguo.cnblogs.com/\">http://ericguo.cnblogs.com/</a></p>"
"</HTML>";
void ImageViewer::on_actionAbout_triggered()
{
QMessageBox::about(this, tr("About Qt Mini Image Viewer"), htmlAboutText);
}
QT的QImage应用代码
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2011-06-22
22:52:20
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收藏 25KB RAR 举报 
QtImage.rar （29个子文件） 
main.cpp 215B
QtImage.exe 52KB QtImage.pro 405B
QtImage main.cpp 215B QtImage.exe 52KB QtImage.pro 405B ImageViewer.cpp 5KB ImageViewer.h 934B QtImageRes.qrc 296B ImageViewer.ui 4KB images 
zoomin.png 877B previous.png 703B zoomout.png 886B about.png 929B zoomnormal.png 1KB next.png 754B Thumbs.db 10KB apply.png 982B ImageViewer.cpp 5KB ImageViewer.h 934B QtImageRes.qrc 296B ImageViewer.ui 4KB images zoomin.png 877B previous.png 703B zoomout.png 886B about.png 929B zoomnormal.png 1KB next.png 754B apply.png 982B
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