feat: add simplified Qt image viewer Dev branch

MainWindow.h

@@ -0,0 +1,90 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QImage>
+#include <QLabel>
+#include <QMainWindow>
+#include <QPixmap>
+#include <QScrollArea>
+#include <QString>
+
+class QAction;
+class QMenu;
+class QPushButton;
+class QSlider;
+
+class ImageLabel final : public QLabel
+{
+    Q_OBJECT
+
+public:
+    explicit ImageLabel(QWidget *parent = nullptr);
+
+Q_SIGNALS:
+    void doubleClicked();
+
+protected:
+    void mouseDoubleClickEvent(QMouseEvent *event) override;
+};
+
+class MainWindow final : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    explicit MainWindow(QWidget *parent = nullptr);
+
+private Q_SLOTS:
+    void openImage();
+    void saveImage();
+    void saveImageAs();
+    void zoomIn();
+    void zoomOut();
+    void fitToWindow();
+    void resetView();
+    void rotateLeft();
+    void rotateRight();
+    void flipHorizontal();
+    void flipVertical();
+    void grayscale();
+    void invertColors();
+    void updateZoomFromSlider(int value);
+
+private:
+    void createActions();
+    void createMenus();
+    void createToolbar();
+    void createCentralWidget();
+    void setImage(const QImage &image, const QString &path = QString());
+    void updateImageView();
+    void setZoomFactor(double factor);
+    void applyTransformedImage(const QImage &image);
+    void updateActions();
+    bool ensureImageLoaded(const QString &actionName) const;
+    bool writeImageToPath(const QString &path);
+
+    ImageLabel *imageLabel_ = nullptr;
+    QScrollArea *scrollArea_ = nullptr;
+    QSlider *zoomSlider_ = nullptr;
+
+    QImage currentImage_;
+    QString currentPath_;
+    double zoomFactor_ = 1.0;
+
+    QAction *openAction_ = nullptr;
+    QAction *saveAction_ = nullptr;
+    QAction *saveAsAction_ = nullptr;
+    QAction *exitAction_ = nullptr;
+    QAction *zoomInAction_ = nullptr;
+    QAction *zoomOutAction_ = nullptr;
+    QAction *fitAction_ = nullptr;
+    QAction *resetAction_ = nullptr;
+    QAction *rotateLeftAction_ = nullptr;
+    QAction *rotateRightAction_ = nullptr;
+    QAction *flipHorizontalAction_ = nullptr;
+    QAction *flipVerticalAction_ = nullptr;
+    QAction *grayscaleAction_ = nullptr;
+    QAction *invertAction_ = nullptr;
+};
+
+#endif // MAINWINDOW_H