declare global property in QML for other QML files

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Use a QML Singleton.

Please reference “Approach 2” on this page
— The ugly QTBUG-34418 comments are mine.

These are the pieces you need:

Style.qml 

pragma Singleton
import QtQuick 2.0
QtObject {
    property color mainbg: 'red'
}

qmldir

This file must be in the same folder as the singleton .qml file (Style.qml in our example) or you must give a relative path to it. qmldir may also need to be included by the .qrc resource file. More information about qmldir files can be found here.

# qmldir
singleton Style Style.qml

How to Reference

import QtQuick 2.0
import "."  // this is needed when referencing singleton object from same folder
Rectangle {
    color: Style.mainbg  // <- there it is!!!
    width: 240; height 160
}

This approach is available since Qt5.0. You need a folder import statement even if referencing the QML singleton in the same folder. If is the same folder, use: import "." This is the bug that I documented on the qt-project page (see QTBUG-34418, singletons require explicit import to load qmldir file).

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