Camera RAW import through LibRaw with a develop sheet (12.6a)

src/UI/RawDevelopSheet.h

@@ -0,0 +1,48 @@
+#pragma once
+#include "IO/RawImporter.h"
+#include <QWidget>
+#include <atomic>
+#include <functional>
+#include <memory>
+#include <optional>
+#include <vector>
+
+class QLabel;
+class QProgressBar;
+class QPushButton;
+class QSlider;
+class QTimer;
+
+// Swift's RawDevelopSheet: a screen-sized preview under four sliders.
+class RawDevelopSheet : public QWidget {
+    Q_OBJECT
+public:
+    RawDevelopSheet(RawDevelopRequest request, std::function<void(std::optional<RawDevelopSettings>)> finish, QWidget *parent = nullptr);
+    ~RawDevelopSheet() override;
+
+private:
+    class Preview;
+    struct Row {
+        QSlider *slider;
+        QLabel *value;
+        float RawDevelopSettings::*field;
+        double scale;
+        int precision;
+        QString unit;
+    };
+    void addRow(const QString &title, float RawDevelopSettings::*field, double low, double high, double scale, int precision, const QString &unit);
+    void changed();
+    void develop();
+    void synchronize();
+
+    const QString m_path;
+    const std::function<void(std::optional<RawDevelopSettings>)> m_finish;
+    RawDevelopSettings m_settings;
+    // The newest develop's flag, Swift's task cancellation.
+    std::shared_ptr<std::atomic_bool> m_cancelled;
+    QTimer *const m_wait;
+    Preview *const m_preview;
+    QProgressBar *const m_spinner;
+    std::vector<Row> m_rows;
+    QPushButton *const m_reset;
+};