Reload SystemPalette after setStyleSheet()

ProgSys

Hi,

I my app you can set different styles, like a dark style, to more customize the look to your liking. To keep the look consistent for my QQuickWidgets I use the SystemPalette element, but the problem is that it doesn't update after I call setStyleSheet() (or setPalette()) in my code.

How can I update the SystemPalette with a new pallette, so the style of my QQuickWidgets fits the overall theme?
Do I actually need to create my own data structure and manually update it, or is there a easier way?

Thanks for your help!

Some code:

TestWindowApp::TestWindowApp(QWidget *parent):QMainWindow(parent) {
	setupUi(this);

	connect(actionThemeDark, &QAction::triggered, this, [this]{;
		QFile f(QString(RESOURCES_PATH)+"/styles/dark/style.qss");
		if (f.open(QFile::ReadOnly | QFile::Text)){
		    setStyleSheet(QString(f.readAll()).arg(QString(RESOURCES_PATH)+"/styles/dark" ));

		    setPalette(palette());//try1
		    timelineQuickWidget->setPalette(palette());//try2

		    emit onStyleChanged();//my custom emit
		}else qDebug() << "Unable to set stylesheet, file not found!";
	});

	timelineQuickWidget->setSource(QUrl::fromLocalFile(RESOURCES_PATH "/qml/Timeline.qml"));
}

QML:

import QtQuick 2.4

Rectangle { 
	SystemPalette { id: activePalette }
	color: activePalette.window
}

jpnurmi

SystemPalette corresponds to QGuiApplication::palette. Changing the palette of a window does not affect the application palette. Try changing the application palette. Notice also that setPalette(palette()) does not change the palette.

ProgSys

Not sure if this is the best approach, but it seems to work.
I reload the QML file after the application palette has bean set.

	connect(this, &TestWindowApp::onStyleChanged, this, [this]{
		QApplication::setPalette(palette());
		 //reload qml
		timelineQuickWidget->setSource(QUrl());
		timelineQuickWidget->engine()->clearComponentCache();
		timelineQuickWidget->setSource(QUrl::fromLocalFile(RESOURCES_PATH "/qml/Timeline.qml"));
	});