decruft more

1 files changed, 392 insertions, 0 deletions

diff --git a/opentrack/options.hpp b/opentrack/options.hpp
new file mode 100644
index 00000000..6c15d729
--- /dev/null
+++ b/opentrack/options.hpp
@@ -0,0 +1,392 @@
+/* Copyright (c) 2013-2014 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 <memory>
+#include <tuple>
+#include <map>
+#include <string>
+
+#include <QObject>
+#include <QSettings>
+#include <QString>
+#include <QVariant>
+#include <QMutex>
+#include <QMutexLocker>
+#include <QWidget>
+#include <QComboBox>
+#include <QCheckBox>
+#include <QDoubleSpinBox>
+#include <QSpinBox>
+#include <QSlider>
+#include <QLineEdit>
+#include <QLabel>
+#include <QCoreApplication>
+
+#include <cinttypes>
+
+#include <QDebug>
+
+namespace options {
+    template<typename k, typename v>
+    using map = std::map<k, v>;
+    using std::string;
+    
+    template<typename t>
+    // don't elide usages of the function, qvariant default implicit
+    // conversion results in nonsensical runtime behavior -sh
+    inline t qcruft_to_t (const QVariant& datum);
+
+    template<>
+    inline int qcruft_to_t<int>(const QVariant& t)
+    {
+        return t.toInt();
+    }
+
+    template<>
+    inline QString qcruft_to_t<QString>(const QVariant& t)
+    {
+        return t.toString();
+    }
+
+    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 QVariant qcruft_to_t<QVariant>(const QVariant& t)
+    {
+        return t;
+    }
+
+    // snapshot of qsettings group at given time
+    class group {
+    private:
+        map<string, QVariant> kvs;
+        string name;
+        static const QString ini_pathname()
+        {
+            QSettings settings(group::org);
+            return settings.value("SettingsFile",
+                                  QCoreApplication::applicationDirPath() + "/settings/default.ini" ).toString();
+        }
+    public:
+        group(const string& name) : name(name)
+        {
+            QSettings conf(ini_pathname(), QSettings::IniFormat);
+            auto q_name = QString::fromStdString(name);
+            conf.beginGroup(q_name);
+            for (auto& k_ : conf.childKeys())
+            {
+                auto tmp = k_.toUtf8();
+                string k(tmp);
+                kvs[k] = conf.value(k_);
+            }
+            conf.endGroup();
+        }
+        static constexpr const char* org = "opentrack";
+        
+        void save()
+        {
+            QSettings s(ini_pathname(), QSettings::IniFormat);
+            auto q_name = QString::fromStdString(name);
+            s.beginGroup(q_name);
+            for (auto& i : kvs)
+            {
+                auto k = QString::fromStdString(i.first);
+                s.setValue(k, i.second);
+            }
+            s.endGroup();
+        }
+        
+        template<typename t>
+        t get(const string& k)
+        {
+            return qcruft_to_t<t>(kvs[k]);
+        }
+        
+        void put(const string& s, const QVariant& d)
+        {
+            kvs[s] = d;
+        }
+        
+        bool contains(const string& s)
+        {
+            return kvs.count(s) != 0;
+        }
+    };
+
+    class impl_bundle : public QObject {
+    protected:
+        QMutex mtx;
+        const string group_name;
+        group saved;
+        group transient;
+        bool modified;
+        impl_bundle(const impl_bundle&) = delete;
+        impl_bundle& operator=(const impl_bundle&) = delete;
+    public:
+        impl_bundle(const string& group_name) :
+            mtx(QMutex::Recursive),
+            group_name(group_name),
+            saved(group_name),
+            transient(saved),
+            modified(false)
+        {
+        }
+        
+        string name() { return group_name; }
+        
+        void reload() {
+            QMutexLocker l(&mtx);
+            saved = group(group_name);
+            transient = saved;
+            modified = false;
+        }
+        
+        bool store_kv(const string& name, const QVariant& datum)
+        {
+            QMutexLocker l(&mtx);
+            
+            auto old = transient.get<QVariant>(name);
+            if (!transient.contains(name) || datum != old)
+            {
+                modified = true;
+                transient.put(name, datum);
+                return true;
+            }
+            return false;
+        }
+        bool contains(const string& name)
+        {
+            QMutexLocker l(&mtx);
+            return transient.contains(name);
+        }
+        template<typename t>
+        t get(const string& name)
+        {
+            QMutexLocker l(&mtx);
+            return transient.get<t>(name);
+        }
+        void save()
+        {
+            QMutexLocker l(&mtx);
+            modified = false;
+            saved = transient;
+            transient.save();
+        }
+
+        bool modifiedp() {
+            QMutexLocker l(&mtx);
+            return modified;
+        }
+    };
+    
+    class opt_bundle;
+    
+    namespace
+    {
+        template<typename k, typename v, typename cnt = int>
+        struct opt_singleton
+        {
+        public:
+            using pbundle = std::shared_ptr<v>;
+            using tt = std::tuple<cnt, pbundle>;
+        private:
+            QMutex implsgl_mtx;
+            map<k, tt> implsgl_data;
+        public:
+            opt_singleton() : implsgl_mtx(QMutex::Recursive) {}
+            
+            static opt_singleton<k, v>& datum()
+            {
+                static auto ret = std::make_shared<opt_singleton<k, v>>();
+                return *ret;
+            }
+            
+            pbundle bundle(const k& key)
+            {
+                QMutexLocker l(&implsgl_mtx);
+                
+                if (implsgl_data.count(key) != 0)
+                    return std::get<1>(implsgl_data[key]);
+                
+                auto shr = std::make_shared<v>(key);
+                implsgl_data[key] = tt(cnt(1), shr);
+                return shr;
+            }
+            
+            void bundle_decf(const k& key)
+            {
+                QMutexLocker l(&implsgl_mtx);
+                
+                if (--std::get<0>(implsgl_data[key]) == 0)
+                    implsgl_data.erase(key);
+            }
+            
+            ~opt_singleton() { implsgl_data.clear(); }
+        };
+        
+        using pbundle = std::shared_ptr<opt_bundle>;
+        using t_fact = opt_singleton<string, opt_bundle>;
+    }
+ 
+    static inline t_fact::pbundle bundle(const string name) { return t_fact::datum().bundle(name); }
+    
+    class opt_bundle : public impl_bundle
+    {
+    public:
+        opt_bundle() : impl_bundle("i-have-no-name") {}
+        opt_bundle(const string& group_name) : impl_bundle(group_name)
+        {
+            qDebug() << "bundle +" << QString::fromStdString(group_name);
+        }
+        
+        ~opt_bundle()
+        {
+            qDebug() << "bundle -" << QString::fromStdString(group_name);
+            t_fact::datum().bundle_decf(group_name);
+        }
+    };
+
+    class base_value : public QObject
+    {
+        Q_OBJECT
+#define DEFINE_SLOT(t) void setValue(t datum) { store(datum); }
+#define DEFINE_SIGNAL(t) void valueChanged(t)
+    public:
+        base_value(pbundle b, const string& name) : b(b), self_name(name) {}
+    signals:
+        DEFINE_SIGNAL(double);
+        DEFINE_SIGNAL(int);
+        DEFINE_SIGNAL(bool);
+        DEFINE_SIGNAL(QString);
+    protected:
+        pbundle b;
+        string self_name;
+
+        template<typename t>
+        void store(const t& datum)
+        {
+            if (b->store_kv(self_name, datum))
+                emit valueChanged(static_cast<t>(datum));
+        }
+    public slots:
+        DEFINE_SLOT(double)
+        DEFINE_SLOT(int)
+        DEFINE_SLOT(QString)
+        DEFINE_SLOT(bool)
+    };
+    
+    static inline string string_from_qstring(const QString& datum)
+    {
+        auto tmp = datum.toUtf8();
+        return string(tmp.constData());
+    }
+
+    template<typename t>
+    class value : public base_value {
+    public:
+        t operator=(const t datum)
+        {
+            store(datum);
+            return datum;
+        }
+        static constexpr const Qt::ConnectionType DIRECT_CONNTYPE = Qt::DirectConnection;
+        static constexpr const Qt::ConnectionType SAFE_CONNTYPE = Qt::UniqueConnection;
+        value(pbundle b, const string& name, t def) : base_value(b, name)
+        {
+            if (!b->contains(name) || b->get<QVariant>(name).type() == QVariant::Invalid)
+                *this = def;
+        }
+        value(pbundle b, const QString& name, t def) : value(b, string_from_qstring(name), def) {}
+        value(pbundle b, const char* name, t def) : value(b, string(name), def) {}
+
+        operator t()
+        {
+            return b->get<t>(self_name);
+        }
+    };
+
+    template<typename t, typename q>
+    inline void tie_setting(value<t>&, q*);
+
+    template<>
+    inline void tie_setting(value<int>& v, QComboBox* cb)
+    {
+        cb->setCurrentIndex(v);
+        v = cb->currentIndex();
+        base_value::connect(cb, SIGNAL(currentIndexChanged(int)), &v, SLOT(setValue(int)), v.DIRECT_CONNTYPE);
+        base_value::connect(&v, SIGNAL(valueChanged(int)), cb, SLOT(setCurrentIndex(int)), v.SAFE_CONNTYPE);
+    }
+
+    template<>
+    inline void tie_setting(value<QString>& v, QComboBox* cb)
+    {
+        cb->setCurrentText(v);
+        v = cb->currentText();
+        base_value::connect(cb, SIGNAL(currentTextChanged(QString)), &v, SLOT(setValue(QString)), v.DIRECT_CONNTYPE);
+        base_value::connect(&v, SIGNAL(valueChanged(QString)), cb, SLOT(setCurrentText(QString)), v.SAFE_CONNTYPE);
+    }
+
+    template<>
+    inline void tie_setting(value<bool>& v, QCheckBox* cb)
+    {
+        cb->setChecked(v);
+        base_value::connect(cb, SIGNAL(toggled(bool)), &v, SLOT(setValue(bool)), v.DIRECT_CONNTYPE);
+        base_value::connect(&v, SIGNAL(valueChanged(bool)), cb, SLOT(setChecked(bool)), v.SAFE_CONNTYPE);
+    }
+
+    template<>
+    inline void tie_setting(value<double>& v, QDoubleSpinBox* dsb)
+    {
+        dsb->setValue(v);
+        base_value::connect(dsb, SIGNAL(valueChanged(double)), &v, SLOT(setValue(double)), v.DIRECT_CONNTYPE);
+        base_value::connect(&v, SIGNAL(valueChanged(double)), dsb, SLOT(setValue(double)), v.SAFE_CONNTYPE);
+    }
+
+    template<>
+    inline void tie_setting(value<int>& v, QSpinBox* sb)
+    {
+        sb->setValue(v);
+        base_value::connect(sb, SIGNAL(valueChanged(int)), &v, SLOT(setValue(int)), v.DIRECT_CONNTYPE);
+        base_value::connect(&v, SIGNAL(valueChanged(int)), sb, SLOT(setValue(int)), v.SAFE_CONNTYPE);
+    }
+
+    template<>
+    inline void tie_setting(value<int>& v, QSlider* sl)
+    {
+        sl->setValue(v);
+        v = sl->value();
+        base_value::connect(sl, SIGNAL(valueChanged(int)), &v, SLOT(setValue(int)), v.DIRECT_CONNTYPE);
+        base_value::connect(&v, SIGNAL(valueChanged(int)), sl, SLOT(setValue(int)), v.SAFE_CONNTYPE);
+    }
+
+    template<>
+    inline void tie_setting(value<QString>& v, QLineEdit* le)
+    {
+        le->setText(v);
+        base_value::connect(le, SIGNAL(textChanged(QString)), &v, SLOT(setValue(QString)), v.DIRECT_CONNTYPE);
+        base_value::connect(&v, SIGNAL(valueChanged(QString)),le, SLOT(setText(QString)), v.SAFE_CONNTYPE);
+    }
+
+    template<>
+    inline void tie_setting(value<QString>& v, QLabel* lb)
+    {
+        lb->setText(v);
+        base_value::connect(&v, SIGNAL(valueChanged(QString)), lb, SLOT(setText(QString)), v.SAFE_CONNTYPE);
+    }
+}