chore: adjusted the project directory structure

app/settings.cpp

@@ -0,0 +1,86 @@
+#include "settings.h"
+
+#include <QApplication>
+#include <QStandardPaths>
+#include <QDebug>
+#include <QDir>
+
+Settings *Settings::m_settings_instance = nullptr;
+
+Settings *Settings::instance()
+{
+    if (!m_settings_instance) {
+        m_settings_instance = new Settings;
+    }
+
+    return m_settings_instance;
+}
+
+bool Settings::stayOnTop()
+{
+    return m_qsettings->value("stay_on_top", true).toBool();
+}
+
+DoubleClickBehavior Settings::doubleClickBehavior()
+{
+    QString result = m_qsettings->value("double_click_behavior", "close").toString().toLower();
+
+    return stringToDoubleClickBehavior(result);
+}
+
+void Settings::setStayOnTop(bool on)
+{
+    m_qsettings->setValue("stay_on_top", on);
+    m_qsettings->sync();
+}
+
+void Settings::setDoubleClickBehavior(DoubleClickBehavior dcb)
+{
+    m_qsettings->setValue("double_click_behavior", doubleClickBehaviorToString(dcb));
+    m_qsettings->sync();
+}
+
+QString Settings::doubleClickBehaviorToString(DoubleClickBehavior dcb)
+{
+    static QMap<DoubleClickBehavior, QString> _map {
+        {ActionCloseWindow, "close"},
+        {ActionMaximizeWindow, "maximize"},
+        {ActionDoNothing, "ignore"}
+    };
+
+    return _map.value(dcb, "close");
+}
+
+DoubleClickBehavior Settings::stringToDoubleClickBehavior(QString str)
+{
+    static QMap<QString, DoubleClickBehavior> _map {
+        {"close", ActionCloseWindow},
+        {"maximize", ActionMaximizeWindow},
+        {"ignore", ActionDoNothing}
+    };
+
+    return _map.value(str, ActionCloseWindow);
+}
+
+Settings::Settings()
+    : QObject(qApp)
+{
+    QString configPath;
+
+#ifdef FLAG_PORTABLE_MODE_SUPPORT
+    QString portableConfigDirPath = QDir(QCoreApplication::applicationDirPath()).absoluteFilePath("data");
+    QFileInfo portableConfigDirInfo(portableConfigDirPath);
+    if (portableConfigDirInfo.exists() && portableConfigDirInfo.isDir() && portableConfigDirInfo.isWritable()) {
+        // we can use it.
+        configPath = portableConfigDirPath;
+    }
+#endif // FLAG_PORTABLE_MODE_SUPPORT
+
+    // %LOCALAPPDATA% under Windows.
+    if (configPath.isEmpty()) {
+        configPath = QStandardPaths::writableLocation(QStandardPaths::ConfigLocation);
+    }
+
+    m_qsettings = new QSettings(QDir(configPath).absoluteFilePath("config.ini"), QSettings::IniFormat, this);
+}
+