Issue with Material Style in QML - qt

Question

I have this small example that does not work as i expected :
import QtQuick 2.9
import QtQuick.Controls 2.2
import QtQuick.Controls.Material 2.2
Window {
id: root
visible: true
width: 640
height: 480
property bool lightTheme: false
Material.theme: Material.Dark
Material.foreground: Material.color(Material.Red) // value is always material red #F44336 (from light theme)
onLightThemeChanged: {
Material.theme = lightTheme ? Material.Light : Material.Dark;
}
Button {
id: btn
width: 200
height: 200
anchors.centerIn: parent
text: "change theme"
onClicked: {
lightTheme = !lightTheme;
}
}
Text {
id: darkRed
text: "predefinedDarkThemeRed"
color: "#EF9A9A"
anchors.top: btn.bottom
anchors.horizontalCenter: btn.horizontalCenter
}
Text {
id: lightRed
text: "predefinedLightThemeRed"
color: "#F44336"
anchors.top: darkRed.bottom
anchors.left: darkRed.left
}
}
The issue is with the default Material.Red color being always picked from the Material.Light theme whatever theme i have selected.
However, when i don't set any Material.foreground, then it is white with the Material.Dark and dark with the Material.Light, and dynamically switched between those colors when the theme is changed, so everything is fine.
I would expected the same behaviour with a custom Material.foreground but it does not seem to work.
What is wrong here ?
Thank you.
Note: the app is run with options -style material args, and i am using Qt 5.9.3 or Qt 5.10.1

Answer 1

i think you missed a little nuance
add in .pro file
QT += quickcontrols2
in mine file add QQuickStyle::setStyle("Material");
#include <QQuickStyle>
#include <QGuiApplication>
#include <QQmlApplicationEngine>
int main(int argc, char *argv[])
{
QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
QGuiApplication app(argc, argv);
................
QQuickStyle::setStyle("Material");
//The style can also be specified as a path to a custom style, such as
//QQuickStyle::setStyle(":/mystyle");
................
return app.exec();
}
in your example, the result will be
when pressed