src/mainwindow.cpp


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

ScaleForm *scaleForm = nullptr;

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

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

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

}

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

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

void MainWindow::fit() {
  const auto pixmpSize = current.size();
  const auto scaleSize =
      pixmpSize.scaled(ui->scrollArea->viewport()->size(), Qt::KeepAspectRatio);

  const int scale = std::min(scaleSize.width() * 100 / pixmpSize.width(),
                             scaleSize.height() * 100 / pixmpSize.height());

  ui->label->setPixmap(
      current.scaled(scaleSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
  scaleForm->setScale(scale);
}

void MainWindow::scale(double scale) {
  const auto scaleSize = current.size() * scale;
  ui->label->setPixmap(
      current.scaled(scaleSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
  scaleForm->setScale(scale * 100);
}