src/mainwindow.cpp


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#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QApplication>
#include <QPixmap>
#include <QResizeEvent>

MainWindow::MainWindow(const QStringList &filePaths, QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow) {
  ui->setupUi(this);

  connect(ui->actionQuit, &QAction::triggered, qApp, &QApplication::quit);

  if (!filePaths.isEmpty()) {
    current.load(filePaths.first());
    setWindowTitle(title_format.arg(filePaths.first()));
    resizePixmap();
  }

  connect(ui->original_toolButton, &QToolButton::clicked, this,
          [this]() { ui->label->setPixmap(current); });

  connect(ui->fit_toolButton, &QToolButton::clicked, this,
          [this]() { resizePixmap(); });
}

MainWindow::~MainWindow() { delete ui; }

void MainWindow::resizeEvent(QResizeEvent *event) {
  resizePixmap();
  QMainWindow::resizeEvent(event);
}

void MainWindow::resizePixmap() {
  const auto size =
      ui->scrollArea->viewport()->size().boundedTo(current.size());
  ui->label->setPixmap(
      current.scaled(size, Qt::KeepAspectRatio, Qt::SmoothTransformation));
}