blame: imageviewwidget.cpp

#include "imageviewwidget.h"

#include <QPainter>

#include <QKeyEvent>

#include <QImageReader>

ImageViewWidget::ImageViewWidget(QWidget *parent)

    : QWidget(parent)

{

    setFocusPolicy(Qt::StrongFocus);

    setStyleSheet("background-color: black;");

}

void ImageViewWidget::setImage(const QString &path)

{

    QImageReader reader(path);

    reader.setAutoTransform(true);

    QImage image = reader.read();

    if (!image.isNull())

        m_pixmap = QPixmap::fromImage(image);

    else

        m_pixmap = QPixmap();

    update();

}

void ImageViewWidget::paintEvent(QPaintEvent *)

{

    if (m_pixmap.isNull())

        return;

    QPainter painter(this);

    QPixmap scaled = m_pixmap.scaled(size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);

    int x = (width()  - scaled.width())  / 2;

    int y = (height() - scaled.height()) / 2;

    painter.drawPixmap(x, y, scaled);

}

void ImageViewWidget::keyPressEvent(QKeyEvent *event)

{

    if (event->key() == Qt::Key_Escape)

    {

        emit closeRequested();

        event->accept();

        return;

    }

    if (event->key() == Qt::Key_PageDown)

    {

        emit nextRequested();

        event->accept();

        return;

    }

    if (event->key() == Qt::Key_PageUp)

    {

        emit previousRequested();

        event->accept();

        return;

    }

    QWidget::keyPressEvent(event);

}