Hi all,
I have a problem that I think is due to QTBUG-39703 [1] and
QTBUG-34418 [2], but perhaps there's a smart workaround.
Imagine the following setup:
dir/
main.qml The main file
MyItem.qml Some item, uses Style
Style.qml Some colors et.c.
State.qml Some application-wide state (uses MyItem, see below!)
qmldir
with contents as follows:
//// main.qml
import QtQuick 2.4
MyItem {
}
//// MyItem.qml
import QtQuick 2.4
import "." // required due to QTBUG-34418
Rectangle {
color: Style.backgroundColor
}
//// Style.qml -- Some colors et.c.
pragma Singleton
import QtQuick 2.4
QtObject {
readonly property color backgroundColor: "#abc"
}
//// State.qml -- Some application-wide state.
pragma Singleton
import QtQuick 2.4
QtObject {
property int someState: 1 // This is fine.
// But what if we need to keep a MyItem as state
// like below? It would lead to a process exit with
// status 255 because this singleton will implicitly
// import MyItem.qml, which in turn must import "."
// to access the Style.qml singleton (due to
// QTBUG-34418), and this will bring in State.qml
// again -> circular dependency :/
//property MyItem someItem: MyItem {}
// Uncomment the above -> Process exits with 255 due to QTBUG-39703
}
This last file shows the problem, if the application state in the
State.qml singleton includes a MyItem, I get a circular dependency
leading to a process exit with status 255.
Is there some way around this conundrum? It's the requirement to make
an explicit import "." to get the Style singleton (due to QTBUG-39703)
that really spoils it I think :/
The qmldir file is:
singleton Style 1.0 Style.qml
singleton State 1.0 State.qml
MyItem 1.0 MyItem.qml
Surely someone has used multiple singletons like this?
Cheers,
Elvis
[1] https://bugreports.qt.io/browse/QTBUG-39703
[2] https://bugreports.qt.io/browse/QTBUG-34418
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