From a7195519a25b715a5786383450a25f0420f7aeb5 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Mon, 30 Dec 2013 08:19:24 +0100
Subject: initial ng options impl, untested

---
 facetracknoir/options.hpp | 200 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 200 insertions(+)
 create mode 100644 facetracknoir/options.hpp

diff --git a/facetracknoir/options.hpp b/facetracknoir/options.hpp
new file mode 100644
index 00000000..7db75941
--- /dev/null
+++ b/facetracknoir/options.hpp
@@ -0,0 +1,200 @@
+/* Copyright (c) 2013 Stanislaw Halik
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ */
+
+#pragma once
+
+#include <QSettings>
+#include <QSettings>
+#include <QMap>
+#include <QString>
+#include <QVariant>
+#include <memory>
+#include <cassert>
+#include <QWidget>
+#include <QComboBox>
+#include <QCheckBox>
+#include <QDoubleSpinBox>
+#include <QSpinBox>
+#include <QSlider>
+
+namespace options {
+    template<typename T>
+    inline T qcruft_to_t(const QVariant& t);
+
+    template<>
+    inline int qcruft_to_t<int>(const QVariant& t)
+    {
+        return t.toInt();
+    }
+
+    template<>
+    inline bool qcruft_to_t<bool>(const QVariant& t)
+    {
+        return t.toBool();
+    }
+
+    template<>
+    inline double qcruft_to_t<double>(const QVariant& t)
+    {
+        return t.toDouble();
+    }
+
+    template<>
+    inline float qcruft_to_t<float>(const QVariant& t)
+    {
+        return t.toFloat();
+    }
+
+    // snapshot of qsettings group at given time
+    class group {
+    private:
+        QMap<QString, QVariant> map;
+        QString name;
+    public:
+        group(const QString& name, QSettings& s) : name(name)
+        {
+            s.beginGroup(name);
+            for (auto& k : s.childKeys())
+                map[k] = s.value(k);
+            s.endGroup();
+        }
+        static constexpr const char* org = "opentrack";
+        void save() {
+            QSettings s(org);
+            s.beginGroup(name);
+            for (auto& k : map.keys())
+                s.setValue(k, map[k]);
+            s.endGroup();
+        }
+        template<typename T>
+        T get(const QString& k) {
+            return qcruft_to_t<T>(map.value(k));
+        }
+
+        void put(const QString& s, const QVariant& d)
+        {
+            map[s] = d;
+        }
+    };
+
+    class bundle {
+    private:
+        const QString group_name;
+        group saved;
+        group transient;
+        bundle(const bundle&) = delete;
+        bundle& operator=(const bundle&) = delete;
+        bool modified;
+    public:
+        bundle(const QString& group_name, QSettings& s) :
+            group_name(group_name),
+            saved(group_name, s),
+            transient(saved),
+            modified(false)
+        {
+        }
+        std::shared_ptr<bundle> make(const QString& name, QSettings& s) {
+            assert(s.format() == QSettings::IniFormat);
+            return std::make_shared<bundle>(name, s);
+        }
+        void store(QString& name, QVariant& datum)
+        {
+            modified = true;
+            transient.put(name, datum);
+        }
+        template<typename T>
+        T get(QString& name) {
+            transient.get<T>(name);
+        }
+        void save()
+        {
+            modified = false;
+            saved = transient;
+            transient.save();
+        }
+        void revert()
+        {
+            modified = false;
+            transient = saved;
+        }
+    };
+
+    typedef std::shared_ptr<bundle> pbundle;
+
+    class QCruft : public QObject {
+    };
+
+    template<typename T>
+    class value : public QCruft {
+    private:
+        const QString self_name;
+        pbundle b;
+    public:
+        value(const pbundle& b, const QString& name) :
+            self_name(name),
+            b(b)
+        {
+        }
+        operator T() { return b->get<T>(self_name); }
+        T& operator=(const T& datum) {
+            b->store(self_name, datum);
+            emit valueChanged(datum);
+            return datum;
+        }
+    public slots:
+        void setValue(const T datum) {
+            this->operator =(datum);
+        }
+    signals:
+        void valueChanged(T datum);
+    };
+
+    template<typename T, typename Q>
+    inline void tie(value<T>&, Q*);
+
+    template<>
+    inline void tie<int, QComboBox>(value<int>& v, QComboBox* cb)
+    {
+        QObject::connect(cb, SIGNAL(currentIndexChanged(int)), &v, SLOT(setValue(int)));
+        QObject::connect(&v, SIGNAL(valueChanged(int)), &v, SLOT(setValue(int)));
+    }
+
+    template<>
+    inline void tie<QString, QComboBox>(value<QString>& v, QComboBox* cb)
+    {
+        QObject::connect(cb, SIGNAL(currentTextChanged(QString)), &v, SLOT(setValue(QString)));
+        QObject::connect(&v, SIGNAL(valueChanged(QString)), &v, SLOT(setValue(QString)));
+    }
+
+    template<>
+    inline void tie<bool, QCheckBox>(value<bool>& v, QCheckBox* cb)
+    {
+        QObject::connect(cb, SIGNAL(toggled(bool)), &v, SLOT(setValue(bool)));
+        QObject::connect(&v, SIGNAL(valueChanged(bool)), cb, SLOT(setChecked(bool)));
+    }
+
+    template<>
+    inline void tie<double, QDoubleSpinBox>(value<double>& v, QDoubleSpinBox* dsb)
+    {
+        QObject::connect(dsb, SIGNAL(valueChanged(double)), &v, SLOT(setValue(double)));
+        QObject::connect(&v, SIGNAL(valueChanged(double)), dsb, SLOT(setValue(double)));
+    }
+
+    template<>
+    inline void tie<int, QSpinBox>(value<int>& v, QSpinBox* sb)
+    {
+        QObject::connect(sb, SIGNAL(valueChanged(int)), &v, SLOT(setValue(int)));
+        QObject::connect(&v, SIGNAL(valueChanged(int)), sb, SLOT(setValue(int)));
+    }
+
+    template<>
+    inline void tie<int, QSlider>(value<int>& v, QSlider* sl)
+    {
+        QObject::connect(sl, SIGNAL(valueChanged(int)), &v, SLOT(setValue(int)));
+        QObject::connect(&v, SIGNAL(valueChanged(int)), sl, SLOT(setValue(int)));
+    }
+}
-- 
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