feat: add layershell support

src/cpp/qmlglobal.cpp

@@ -0,0 +1,59 @@
+#include "qmlglobal.hpp"
+
+#include <qcontainerfwd.h>
+#include <qcoreapplication.h>
+#include <qguiapplication.h>
+#include <qobject.h>
+#include <qqmllist.h>
+#include <qtmetamacros.h>
+#include <qtypes.h>
+
+#include "qmlscreen.hpp"
+
+QtShellGlobal::QtShellGlobal(QObject* parent): QObject(parent) {
+	auto* app = QCoreApplication::instance();
+	auto* guiApp = qobject_cast<QGuiApplication*>(app);
+
+	if (guiApp != nullptr) {
+		// clang-format off
+		QObject::connect(guiApp, &QGuiApplication::primaryScreenChanged, this, &QtShellGlobal::updateScreens);
+		QObject::connect(guiApp, &QGuiApplication::screenAdded, this, &QtShellGlobal::updateScreens);
+		QObject::connect(guiApp, &QGuiApplication::screenRemoved, this, &QtShellGlobal::updateScreens);
+		// clang-format on
+
+		this->updateScreens();
+	}
+}
+
+qsizetype QtShellGlobal::screensCount(QQmlListProperty<QtShellScreenInfo>* prop) {
+	return static_cast<QtShellGlobal*>(prop->object)->mScreens.size(); // NOLINT
+}
+
+QtShellScreenInfo* QtShellGlobal::screenAt(QQmlListProperty<QtShellScreenInfo>* prop, qsizetype i) {
+	return static_cast<QtShellGlobal*>(prop->object)->mScreens.at(i); // NOLINT
+}
+
+QQmlListProperty<QtShellScreenInfo> QtShellGlobal::screens() {
+	return QQmlListProperty<QtShellScreenInfo>(
+	    this,
+	    nullptr,
+	    &QtShellGlobal::screensCount,
+	    &QtShellGlobal::screenAt
+	);
+}
+
+void QtShellGlobal::updateScreens() {
+	auto screens = QGuiApplication::screens();
+	this->mScreens.resize(screens.size());
+
+	for (auto i = 0; i < screens.size(); i++) {
+		if (this->mScreens[i] != nullptr) {
+			this->mScreens[i]->screen = nullptr;
+			this->mScreens[i]->setParent(nullptr); // delete if not owned by the js engine
+		}
+
+		this->mScreens[i] = new QtShellScreenInfo(this, screens[i]);
+	}
+
+	emit this->screensChanged();
+}