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ImageViewer.cpp
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90 lines (73 loc) · 2.8 KB
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#include "ImageViewer.h"
#include "ui_ImageViewer.h"
#include <QPrinter>
#include <QPrintPreviewDialog>
#include <QPainter>
#include <QScrollBar>
ImageViewer::ImageViewer(QWidget* parent) :
QWidget(parent),
ui(new Ui::ImageViewer)
{
ui->setupUi(this);
connect(ui->buttonOriginalSize, &QToolButton::clicked, [this]{ scaleImage(100); });
ui->labelView->addAction(ui->actionPrintImage);
}
ImageViewer::~ImageViewer()
{
delete ui;
}
void ImageViewer::resetImage()
{
ui->labelView->setPixmap(QPixmap(0, 0));
}
void ImageViewer::setImage(const QImage& image)
{
ui->labelView->setPixmap(QPixmap::fromImage(image));
// If the image is larger than the viewport scale it to fit the viewport.
// If the image is smaller than the viewport show it in its original size.
if(image.size().width() > ui->labelView->size().width() || image.size().height() > ui->labelView->size().height())
ui->buttonFitToWindow->setChecked(true);
else
scaleImage(100);
}
void ImageViewer::openPrintImageDialog()
{
QPrinter printer;
QPrintPreviewDialog dialog(&printer);
connect(&dialog, &QPrintPreviewDialog::paintRequested, [&](QPrinter* previewPrinter) {
QPainter painter(previewPrinter);
QRect rect = painter.viewport();
QSize size = ui->labelView->pixmap()->size();
size.scale(rect.size(), Qt::KeepAspectRatio);
painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
painter.setWindow(ui->labelView->pixmap()->rect());
painter.drawPixmap(0, 0, *ui->labelView->pixmap());
});
dialog.exec();
}
void ImageViewer::scaleToFitWindow(bool enabled)
{
// Enable/disable the automatic resizing of the label inside the scrollbar
ui->scrollArea->setWidgetResizable(enabled);
// When disabling the fit to window scaling, revert back to the original image size
if(!enabled)
scaleImage(100);
}
void ImageViewer::scaleImage(int scale)
{
// Make sure the slider is updated when this is called programatically
ui->sliderScale->setValue(scale);
// Update our scale factor
qreal factor_change = (scale / 100.0) / m_scale_factor;
m_scale_factor = scale / 100.0;
// Resize the image
ui->labelView->resize(m_scale_factor * ui->labelView->pixmap()->size());
// Uncheck the fit to window button
ui->buttonFitToWindow->setChecked(false);
// Fix scroll bars to zoom into center of viewport instead of tthe upper left corner
const auto adjust_scrollbar = [](QScrollBar* scroll_bar, qreal factor) {
scroll_bar->setValue(static_cast<int>(factor * scroll_bar->value() + ((factor - 1) * scroll_bar->pageStep() / 2)));
};
adjust_scrollbar(ui->scrollArea->horizontalScrollBar(), factor_change);
adjust_scrollbar(ui->scrollArea->verticalScrollBar(), factor_change);
}