feat: add simplified Qt image viewer Dev branch
This commit is contained in:
luochen570
413
MainWindow.cpp
Normal file
413
MainWindow.cpp
Normal file
@@ -0,0 +1,413 @@
|
||||
#include "MainWindow.h"
|
||||
|
||||
#include <QAction>
|
||||
#include <QApplication>
|
||||
#include <QFileDialog>
|
||||
#include <QFileInfo>
|
||||
#include <QImageReader>
|
||||
#include <QImageWriter>
|
||||
#include <QKeySequence>
|
||||
#include <QMenuBar>
|
||||
#include <QMessageBox>
|
||||
#include <QMouseEvent>
|
||||
#include <QSlider>
|
||||
#include <QStatusBar>
|
||||
#include <QToolBar>
|
||||
|
||||
#include <algorithm>
|
||||
#include <cmath>
|
||||
|
||||
ImageLabel::ImageLabel(QWidget *parent)
|
||||
: QLabel(parent)
|
||||
{
|
||||
setAlignment(Qt::AlignCenter);
|
||||
setBackgroundRole(QPalette::Base);
|
||||
setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
|
||||
setScaledContents(false);
|
||||
setMinimumSize(320, 240);
|
||||
setText(tr("打开一张图片开始查看"));
|
||||
}
|
||||
|
||||
void ImageLabel::mouseDoubleClickEvent(QMouseEvent *event)
|
||||
{
|
||||
if (event->button() == Qt::LeftButton) {
|
||||
Q_EMIT doubleClicked();
|
||||
}
|
||||
QLabel::mouseDoubleClickEvent(event);
|
||||
}
|
||||
|
||||
MainWindow::MainWindow(QWidget *parent)
|
||||
: QMainWindow(parent)
|
||||
{
|
||||
createActions();
|
||||
createMenus();
|
||||
createToolbar();
|
||||
createCentralWidget();
|
||||
updateActions();
|
||||
|
||||
setWindowTitle(tr("chengnan 图片查看器"));
|
||||
resize(1100, 720);
|
||||
statusBar()->showMessage(tr("就绪"));
|
||||
}
|
||||
|
||||
void MainWindow::createActions()
|
||||
{
|
||||
openAction_ = new QAction(tr("打开(&O)"), this);
|
||||
openAction_->setShortcut(QKeySequence::Open);
|
||||
connect(openAction_, &QAction::triggered, this, &MainWindow::openImage);
|
||||
|
||||
saveAction_ = new QAction(tr("保存(&S)"), this);
|
||||
saveAction_->setShortcut(QKeySequence::Save);
|
||||
connect(saveAction_, &QAction::triggered, this, &MainWindow::saveImage);
|
||||
|
||||
saveAsAction_ = new QAction(tr("另存为(&A)"), this);
|
||||
saveAsAction_->setShortcut(QKeySequence::SaveAs);
|
||||
connect(saveAsAction_, &QAction::triggered, this, &MainWindow::saveImageAs);
|
||||
|
||||
exitAction_ = new QAction(tr("退出(&X)"), this);
|
||||
exitAction_->setShortcut(QKeySequence::Quit);
|
||||
connect(exitAction_, &QAction::triggered, this, &QWidget::close);
|
||||
|
||||
zoomInAction_ = new QAction(tr("放大"), this);
|
||||
zoomInAction_->setShortcut(QKeySequence::ZoomIn);
|
||||
connect(zoomInAction_, &QAction::triggered, this, &MainWindow::zoomIn);
|
||||
|
||||
zoomOutAction_ = new QAction(tr("缩小"), this);
|
||||
zoomOutAction_->setShortcut(QKeySequence::ZoomOut);
|
||||
connect(zoomOutAction_, &QAction::triggered, this, &MainWindow::zoomOut);
|
||||
|
||||
fitAction_ = new QAction(tr("适配窗口"), this);
|
||||
fitAction_->setShortcut(Qt::CTRL | Qt::Key_F);
|
||||
connect(fitAction_, &QAction::triggered, this, &MainWindow::fitToWindow);
|
||||
|
||||
resetAction_ = new QAction(tr("原始大小"), this);
|
||||
resetAction_->setShortcut(Qt::CTRL | Qt::Key_0);
|
||||
connect(resetAction_, &QAction::triggered, this, &MainWindow::resetView);
|
||||
|
||||
rotateLeftAction_ = new QAction(tr("左旋 90°"), this);
|
||||
connect(rotateLeftAction_, &QAction::triggered, this, &MainWindow::rotateLeft);
|
||||
|
||||
rotateRightAction_ = new QAction(tr("右旋 90°"), this);
|
||||
connect(rotateRightAction_, &QAction::triggered, this, &MainWindow::rotateRight);
|
||||
|
||||
flipHorizontalAction_ = new QAction(tr("水平翻转"), this);
|
||||
connect(flipHorizontalAction_, &QAction::triggered, this, &MainWindow::flipHorizontal);
|
||||
|
||||
flipVerticalAction_ = new QAction(tr("垂直翻转"), this);
|
||||
connect(flipVerticalAction_, &QAction::triggered, this, &MainWindow::flipVertical);
|
||||
|
||||
grayscaleAction_ = new QAction(tr("灰度化"), this);
|
||||
connect(grayscaleAction_, &QAction::triggered, this, &MainWindow::grayscale);
|
||||
|
||||
invertAction_ = new QAction(tr("反色"), this);
|
||||
connect(invertAction_, &QAction::triggered, this, &MainWindow::invertColors);
|
||||
}
|
||||
|
||||
void MainWindow::createMenus()
|
||||
{
|
||||
QMenu *fileMenu = menuBar()->addMenu(tr("文件(&F)"));
|
||||
fileMenu->addAction(openAction_);
|
||||
fileMenu->addAction(saveAction_);
|
||||
fileMenu->addAction(saveAsAction_);
|
||||
fileMenu->addSeparator();
|
||||
fileMenu->addAction(exitAction_);
|
||||
|
||||
QMenu *viewMenu = menuBar()->addMenu(tr("查看(&V)"));
|
||||
viewMenu->addAction(zoomInAction_);
|
||||
viewMenu->addAction(zoomOutAction_);
|
||||
viewMenu->addAction(fitAction_);
|
||||
viewMenu->addAction(resetAction_);
|
||||
|
||||
QMenu *processMenu = menuBar()->addMenu(tr("处理(&P)"));
|
||||
processMenu->addAction(rotateLeftAction_);
|
||||
processMenu->addAction(rotateRightAction_);
|
||||
processMenu->addAction(flipHorizontalAction_);
|
||||
processMenu->addAction(flipVerticalAction_);
|
||||
processMenu->addSeparator();
|
||||
processMenu->addAction(grayscaleAction_);
|
||||
processMenu->addAction(invertAction_);
|
||||
}
|
||||
|
||||
void MainWindow::createToolbar()
|
||||
{
|
||||
QToolBar *toolbar = addToolBar(tr("主工具栏"));
|
||||
toolbar->setMovable(false);
|
||||
toolbar->addAction(openAction_);
|
||||
toolbar->addAction(saveAction_);
|
||||
toolbar->addSeparator();
|
||||
toolbar->addAction(zoomOutAction_);
|
||||
|
||||
zoomSlider_ = new QSlider(Qt::Horizontal, this);
|
||||
zoomSlider_->setRange(10, 400);
|
||||
zoomSlider_->setValue(100);
|
||||
zoomSlider_->setFixedWidth(180);
|
||||
zoomSlider_->setToolTip(tr("缩放比例"));
|
||||
connect(zoomSlider_, &QSlider::valueChanged, this, &MainWindow::updateZoomFromSlider);
|
||||
toolbar->addWidget(zoomSlider_);
|
||||
|
||||
toolbar->addAction(zoomInAction_);
|
||||
toolbar->addAction(fitAction_);
|
||||
toolbar->addSeparator();
|
||||
toolbar->addAction(rotateLeftAction_);
|
||||
toolbar->addAction(rotateRightAction_);
|
||||
toolbar->addAction(grayscaleAction_);
|
||||
toolbar->addAction(invertAction_);
|
||||
}
|
||||
|
||||
void MainWindow::createCentralWidget()
|
||||
{
|
||||
imageLabel_ = new ImageLabel(this);
|
||||
connect(imageLabel_, &ImageLabel::doubleClicked, this, &MainWindow::fitToWindow);
|
||||
|
||||
scrollArea_ = new QScrollArea(this);
|
||||
scrollArea_->setBackgroundRole(QPalette::Dark);
|
||||
scrollArea_->setWidget(imageLabel_);
|
||||
scrollArea_->setWidgetResizable(true);
|
||||
setCentralWidget(scrollArea_);
|
||||
}
|
||||
|
||||
void MainWindow::openImage()
|
||||
{
|
||||
const QString fileName = QFileDialog::getOpenFileName(
|
||||
this,
|
||||
tr("打开图片"),
|
||||
QString(),
|
||||
tr("图片文件 (*.png *.jpg *.jpeg *.bmp *.gif *.webp);;所有文件 (*.*)"));
|
||||
|
||||
if (fileName.isEmpty()) {
|
||||
return;
|
||||
}
|
||||
|
||||
QImageReader reader(fileName);
|
||||
reader.setAutoTransform(true);
|
||||
const QImage image = reader.read();
|
||||
if (image.isNull()) {
|
||||
QMessageBox::warning(this, tr("打开失败"), tr("无法读取图片：%1").arg(reader.errorString()));
|
||||
return;
|
||||
}
|
||||
|
||||
setImage(image, fileName);
|
||||
}
|
||||
|
||||
void MainWindow::saveImage()
|
||||
{
|
||||
if (!ensureImageLoaded(tr("保存"))) {
|
||||
return;
|
||||
}
|
||||
|
||||
if (currentPath_.isEmpty()) {
|
||||
saveImageAs();
|
||||
return;
|
||||
}
|
||||
|
||||
writeImageToPath(currentPath_);
|
||||
}
|
||||
|
||||
void MainWindow::saveImageAs()
|
||||
{
|
||||
if (!ensureImageLoaded(tr("另存为"))) {
|
||||
return;
|
||||
}
|
||||
|
||||
const QString fileName = QFileDialog::getSaveFileName(
|
||||
this,
|
||||
tr("另存为"),
|
||||
currentPath_.isEmpty() ? QStringLiteral("chengnan.png") : currentPath_,
|
||||
tr("PNG 图片 (*.png);;JPEG 图片 (*.jpg *.jpeg);;BMP 图片 (*.bmp);;所有文件 (*.*)"));
|
||||
|
||||
if (!fileName.isEmpty()) {
|
||||
writeImageToPath(fileName);
|
||||
}
|
||||
}
|
||||
|
||||
void MainWindow::zoomIn()
|
||||
{
|
||||
setZoomFactor(zoomFactor_ * 1.25);
|
||||
}
|
||||
|
||||
void MainWindow::zoomOut()
|
||||
{
|
||||
setZoomFactor(zoomFactor_ / 1.25);
|
||||
}
|
||||
|
||||
void MainWindow::fitToWindow()
|
||||
{
|
||||
if (!ensureImageLoaded(tr("适配窗口"))) {
|
||||
return;
|
||||
}
|
||||
|
||||
const QSize viewportSize = scrollArea_->viewport()->size();
|
||||
const QSize imageSize = currentImage_.size();
|
||||
if (imageSize.isEmpty()) {
|
||||
return;
|
||||
}
|
||||
|
||||
const double xRatio = static_cast<double>(viewportSize.width()) / imageSize.width();
|
||||
const double yRatio = static_cast<double>(viewportSize.height()) / imageSize.height();
|
||||
setZoomFactor(std::min(xRatio, yRatio));
|
||||
}
|
||||
|
||||
void MainWindow::resetView()
|
||||
{
|
||||
setZoomFactor(1.0);
|
||||
}
|
||||
|
||||
void MainWindow::rotateLeft()
|
||||
{
|
||||
if (!ensureImageLoaded(tr("旋转"))) {
|
||||
return;
|
||||
}
|
||||
QTransform transform;
|
||||
transform.rotate(-90);
|
||||
applyTransformedImage(currentImage_.transformed(transform, Qt::SmoothTransformation));
|
||||
}
|
||||
|
||||
void MainWindow::rotateRight()
|
||||
{
|
||||
if (!ensureImageLoaded(tr("旋转"))) {
|
||||
return;
|
||||
}
|
||||
QTransform transform;
|
||||
transform.rotate(90);
|
||||
applyTransformedImage(currentImage_.transformed(transform, Qt::SmoothTransformation));
|
||||
}
|
||||
|
||||
void MainWindow::flipHorizontal()
|
||||
{
|
||||
if (!ensureImageLoaded(tr("翻转"))) {
|
||||
return;
|
||||
}
|
||||
applyTransformedImage(currentImage_.mirrored(true, false));
|
||||
}
|
||||
|
||||
void MainWindow::flipVertical()
|
||||
{
|
||||
if (!ensureImageLoaded(tr("翻转"))) {
|
||||
return;
|
||||
}
|
||||
applyTransformedImage(currentImage_.mirrored(false, true));
|
||||
}
|
||||
|
||||
void MainWindow::grayscale()
|
||||
{
|
||||
if (!ensureImageLoaded(tr("灰度化"))) {
|
||||
return;
|
||||
}
|
||||
applyTransformedImage(currentImage_.convertToFormat(QImage::Format_Grayscale8));
|
||||
}
|
||||
|
||||
void MainWindow::invertColors()
|
||||
{
|
||||
if (!ensureImageLoaded(tr("反色"))) {
|
||||
return;
|
||||
}
|
||||
QImage image = currentImage_.convertToFormat(QImage::Format_ARGB32);
|
||||
image.invertPixels(QImage::InvertRgb);
|
||||
applyTransformedImage(image);
|
||||
}
|
||||
|
||||
void MainWindow::updateZoomFromSlider(int value)
|
||||
{
|
||||
const double factor = static_cast<double>(value) / 100.0;
|
||||
if (std::abs(factor - zoomFactor_) > 0.001) {
|
||||
zoomFactor_ = factor;
|
||||
updateImageView();
|
||||
}
|
||||
}
|
||||
|
||||
void MainWindow::setImage(const QImage &image, const QString &path)
|
||||
{
|
||||
currentImage_ = image.convertToFormat(QImage::Format_ARGB32);
|
||||
currentPath_ = path;
|
||||
setZoomFactor(1.0);
|
||||
updateActions();
|
||||
|
||||
const QFileInfo info(path);
|
||||
setWindowTitle(path.isEmpty()
|
||||
? tr("chengnan 图片查看器")
|
||||
: tr("%1 - chengnan 图片查看器").arg(info.fileName()));
|
||||
statusBar()->showMessage(tr("已加载：%1 × %2").arg(currentImage_.width()).arg(currentImage_.height()), 5000);
|
||||
}
|
||||
|
||||
void MainWindow::updateImageView()
|
||||
{
|
||||
if (currentImage_.isNull()) {
|
||||
imageLabel_->setPixmap(QPixmap());
|
||||
imageLabel_->setText(tr("打开一张图片开始查看"));
|
||||
return;
|
||||
}
|
||||
|
||||
const QSize scaledSize = currentImage_.size() * zoomFactor_;
|
||||
const QPixmap pixmap = QPixmap::fromImage(currentImage_).scaled(
|
||||
scaledSize,
|
||||
Qt::KeepAspectRatio,
|
||||
Qt::SmoothTransformation);
|
||||
|
||||
imageLabel_->setText(QString());
|
||||
imageLabel_->setPixmap(pixmap);
|
||||
imageLabel_->resize(pixmap.size());
|
||||
|
||||
if (zoomSlider_->value() != static_cast<int>(zoomFactor_ * 100.0)) {
|
||||
zoomSlider_->blockSignals(true);
|
||||
zoomSlider_->setValue(static_cast<int>(zoomFactor_ * 100.0));
|
||||
zoomSlider_->blockSignals(false);
|
||||
}
|
||||
|
||||
statusBar()->showMessage(tr("缩放：%1%").arg(static_cast<int>(zoomFactor_ * 100.0)));
|
||||
}
|
||||
|
||||
void MainWindow::setZoomFactor(double factor)
|
||||
{
|
||||
zoomFactor_ = std::clamp(factor, 0.10, 4.00);
|
||||
updateImageView();
|
||||
}
|
||||
|
||||
void MainWindow::applyTransformedImage(const QImage &image)
|
||||
{
|
||||
currentImage_ = image.convertToFormat(QImage::Format_ARGB32);
|
||||
updateImageView();
|
||||
updateActions();
|
||||
statusBar()->showMessage(tr("处理完成，可保存结果"), 3000);
|
||||
}
|
||||
|
||||
void MainWindow::updateActions()
|
||||
{
|
||||
const bool hasImage = !currentImage_.isNull();
|
||||
saveAction_->setEnabled(hasImage);
|
||||
saveAsAction_->setEnabled(hasImage);
|
||||
zoomInAction_->setEnabled(hasImage);
|
||||
zoomOutAction_->setEnabled(hasImage);
|
||||
fitAction_->setEnabled(hasImage);
|
||||
resetAction_->setEnabled(hasImage);
|
||||
rotateLeftAction_->setEnabled(hasImage);
|
||||
rotateRightAction_->setEnabled(hasImage);
|
||||
flipHorizontalAction_->setEnabled(hasImage);
|
||||
flipVerticalAction_->setEnabled(hasImage);
|
||||
grayscaleAction_->setEnabled(hasImage);
|
||||
invertAction_->setEnabled(hasImage);
|
||||
zoomSlider_->setEnabled(hasImage);
|
||||
}
|
||||
|
||||
bool MainWindow::ensureImageLoaded(const QString &actionName) const
|
||||
{
|
||||
if (!currentImage_.isNull()) {
|
||||
return true;
|
||||
}
|
||||
|
||||
QMessageBox::information(nullptr, actionName, tr("请先打开一张图片。"));
|
||||
return false;
|
||||
}
|
||||
|
||||
bool MainWindow::writeImageToPath(const QString &path)
|
||||
{
|
||||
QImageWriter writer(path);
|
||||
if (!writer.write(currentImage_)) {
|
||||
QMessageBox::warning(this, tr("保存失败"), tr("无法保存图片：%1").arg(writer.errorString()));
|
||||
return false;
|
||||
}
|
||||
|
||||
currentPath_ = path;
|
||||
setWindowTitle(tr("%1 - chengnan 图片查看器").arg(QFileInfo(path).fileName()));
|
||||
statusBar()->showMessage(tr("已保存：%1").arg(path), 5000);
|
||||
return true;
|
||||
}
|
||||
Reference in New Issue
Block a user