app/qml/styles/StyleSettings.qml

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pragma Singleton
import QtQuick 2.5
import "./Dark.js" as Dark
import "./Light.js" as Light

Item {
    property int wHeight
    property int wWidth
    property var theme: _cppAppSettings.loadSetting("theme") === "Light" ? Light:
                        _cppAppSettings.loadSetting("theme") === "Dark" ? Dark:null
    // Colors
    readonly property color backgroundColor:  theme.backgroundColor

    // buttons
    readonly property color buttonColor:  theme.buttonColor
    readonly property color buttonPressedColor:  theme.buttonPressedColor
    readonly property color buttonBorderColor:  theme.buttonBorderColor
    readonly property color disabledButtonColor:  theme.disabledButtonColor

    readonly property color viewColor:  theme.viewColor
    readonly property color menuColor: theme.menuColor

    //delegates
    readonly property color delegate1Color:  theme.delegate1Color
    readonly property color delegate2Color:  theme.delegate2Color

    //text
    readonly property color textColor:  theme.textColor
    readonly property color textDarkColor:  theme.textDarkColor
    readonly property color disabledTextColor:  theme.disabledTextColor

    readonly property color sliderColor:  theme.sliderColor

    readonly property color errorColor:  theme.errorColor
    readonly property color infoColor:  theme.infoColor

    readonly property color lineColor:  theme.lineColor

    // Icons
    readonly property string backIcon:  theme.backIcon
    readonly property string settIcon:  theme.settIcon

    // Font sizes
    property real microFontSize: hugeFontSize * 0.2
    property real tinyFontSize: hugeFontSize * 0.4
    property real smallTinyFontSize: hugeFontSize * 0.5
    property real smallFontSize: hugeFontSize * 0.6
    property real mediumFontSize: hugeFontSize * 0.7
    property real bigFontSize: hugeFontSize * 0.8
    property real largeFontSize: hugeFontSize * 0.9
    property real hugeFontSize: (wWidth + wHeight) * 0.03
    property real giganticFontSize: (wWidth + wHeight) * 0.04

    // Some other values
    property real fieldHeight: wHeight * 0.08
    property real fieldMargin: fieldHeight * 0.5
    property real buttonHeight: wHeight * 0.08
    property real buttonRadius: buttonHeight * 0.1

    function refreshTheme(){
        switch(_cppAppSettings.loadSetting("theme")){
        case "Dark":
            theme = Light
            break
        case "Light":
            theme = Dark
            break
        default:
            theme = Light
            break
        }
    }



    // Some help functions
    function widthForHeight(h, ss)
    {
        return h/ss.height * ss.width;
    }

    function heightForWidth(w, ss)
    {
        return w/ss.width * ss.height;
    }

    function setTheme()
    {
        switch(_cppAppSettings.loadSetting("theme")){
        case "Dark":
            _cppAppSettings.writeSetting("theme", "Light")
            theme = Light
            break
        case "Light":
            _cppAppSettings.writeSetting("theme", "Dark")
            theme = Dark
            break
        default:
            _cppAppSettings.writeSetting("theme", "Light")
            theme = Light
            break
        }
    }

}