feat: add layershell support

.clang-tidy

@@ -11,6 +11,7 @@ Checks: >
   -cppcoreguidelines-avoid-magic-numbers,
   -cppcoreguidelines-pro-bounds-constant-array-index,
   -cppcoreguidelines-avoid-const-or-ref-data-members,
+  -cppcoreguidelines-non-private-member-variables-in-classes,
   google-build-using-namespace.
   google-explicit-constructor,
   google-global-names-in-headers,
@@ -41,6 +42,7 @@ CheckOptions:
   readability-identifier-naming.ClassCase: CamelCase
   readability-identifier-naming.ConstantCase: UPPER_CASE
   readability-identifier-naming.EnumCase: CamelCase
+  readability-identifier-naming.EnumConstantCase: CamelCase
   readability-identifier-naming.FunctionCase: camelBack
   readability-identifier-naming.MemberCase: camelBack
   readability-identifier-naming.NamespaceCase: lower_case

CMakeLists.txt

@@ -30,6 +30,9 @@ qt_add_executable(qtshell
 	src/cpp/proxywindow.cpp
 	src/cpp/scavenge.cpp
 	src/cpp/rootwrapper.cpp
+	src/cpp/layershell.cpp
+	src/cpp/qmlglobal.cpp
+	src/cpp/qmlscreen.cpp
 )
 
 qt_add_qml_module(qtshell URI QtShell)

shell.nix

@@ -11,8 +11,8 @@
     domain = "git.outfoxxed.me";
     owner = "outfoxxed";
     repo = "layer-shell-qt-nokde";
-    rev = "a50d30687cc03ae4da177033faf5f038c3e1a8b2";
-    sha256 = "5fNwoCce74SSqR5XB3fJ8GI+D5cbkcLRok42k8R3XSw=";
+    rev = "2ebe7b313efbacfcd62ec39e2fda6b4c740d0770";
+    sha256 = "N/nMwf5LQMMwCJvG7J/6xug/EUppHedQCngzCkH8Auk=";
   })) {}; #pkgs.callPackage (import /home/admin/programming/outfoxxed/layer-shell-qt) {};
 in pkgs.mkShell {
   nativeBuildInputs = with pkgs; [

src/cpp/layershell.cpp

@@ -0,0 +1,253 @@
+#include "layershell.hpp"
+
+#include <LayerShellQt/window.h>
+#include <qmargins.h>
+#include <qobject.h>
+#include <qqmllist.h>
+#include <qquickitem.h>
+#include <qquickwindow.h>
+#include <qscreen.h>
+#include <qtypes.h>
+#include <qwindow.h>
+
+#include "proxywindow.hpp"
+#include "qmlscreen.hpp"
+
+void ProxyShellWindow::earlyInit(QObject* old) {
+	ProxyWindowBase::earlyInit(old);
+
+	QObject::connect(this->window, &QWindow::screenChanged, this, &ProxyShellWindow::screenChanged);
+
+	this->shellWindow = LayerShellQt::Window::get(this->window);
+
+	// dont want to steal focus unless actually configured to
+	this->shellWindow->setKeyboardInteractivity(LayerShellQt::Window::KeyboardInteractivityNone);
+
+	// this dosent reset if its unset
+	this->shellWindow->setExclusiveZone(0);
+
+	// clang-format off
+	QObject::connect(this->shellWindow, &LayerShellQt::Window::anchorsChanged, this, &ProxyShellWindow::anchorsChanged);
+	QObject::connect(this->shellWindow, &LayerShellQt::Window::marginsChanged, this, &ProxyShellWindow::marginsChanged);
+	QObject::connect(this->shellWindow, &LayerShellQt::Window::layerChanged, this, &ProxyShellWindow::layerChanged);
+	QObject::connect(this->shellWindow, &LayerShellQt::Window::keyboardInteractivityChanged, this, &ProxyShellWindow::keyboardFocusChanged);
+	// clang-format on
+}
+
+void ProxyShellWindow::componentComplete() {
+	this->complete = true;
+
+	// The default anchor settings are a hazard because they cover the entire screen.
+	// We opt for 0 anchors by default to avoid blocking user input.
+	this->setAnchors(this->stagingAnchors);
+
+	// Make sure we signal changes from anchors, but only if this is a reload.
+	// If we do it on first load then it sends an extra change at 0px.
+	if (this->stagingAnchors.mLeft && this->stagingAnchors.mRight && this->width() != 0)
+		this->widthChanged(this->width());
+	if (this->stagingAnchors.mTop && this->stagingAnchors.mBottom && this->height() != 0)
+		this->heightChanged(this->height());
+
+	this->window->setVisible(this->stagingVisible);
+
+	ProxyWindowBase::componentComplete();
+}
+
+QQuickWindow* ProxyShellWindow::disownWindow() {
+	QObject::disconnect(this->shellWindow, nullptr, this, nullptr);
+	return ProxyWindowBase::disownWindow();
+}
+
+void ProxyShellWindow::setVisible(bool visible) {
+	if (!this->complete) this->stagingVisible = visible;
+	else ProxyWindowBase::setVisible(visible);
+}
+
+bool ProxyShellWindow::isVisible() {
+	return this->complete ? ProxyWindowBase::isVisible() : this->stagingVisible;
+}
+
+void ProxyShellWindow::setWidth(qint32 width) {
+	this->requestedWidth = width;
+
+	// only update the actual size if not blocked by anchors
+	auto anchors = this->anchors();
+	if (this->complete && (!anchors.mLeft || !anchors.mRight)) ProxyWindowBase::setWidth(width);
+}
+
+qint32 ProxyShellWindow::width() {
+	return this->complete ? ProxyWindowBase::width() : this->requestedWidth;
+}
+
+void ProxyShellWindow::setHeight(qint32 height) {
+	this->requestedHeight = height;
+
+	// only update the actual size if not blocked by anchors
+	auto anchors = this->anchors();
+	if (this->complete && (!anchors.mTop || !anchors.mBottom)) ProxyWindowBase::setHeight(height);
+}
+
+qint32 ProxyShellWindow::height() {
+	return this->complete ? ProxyWindowBase::height() : this->requestedHeight;
+}
+
+void ProxyShellWindow::setScreen(QtShellScreenInfo* screen) {
+	this->window->setScreen(screen->screen);
+}
+
+QtShellScreenInfo* ProxyShellWindow::screen() const {
+	return new QtShellScreenInfo(
+	    const_cast<ProxyShellWindow*>(this), // NOLINT
+	    this->window->screen()
+	);
+}
+
+void ProxyShellWindow::setAnchors(Anchors anchors) {
+	if (!this->complete) {
+		this->stagingAnchors = anchors;
+		return;
+	}
+
+	auto lsAnchors = LayerShellQt::Window::Anchors();
+	if (anchors.mLeft) lsAnchors |= LayerShellQt::Window::AnchorLeft;
+	if (anchors.mRight) lsAnchors |= LayerShellQt::Window::AnchorRight;
+	if (anchors.mTop) lsAnchors |= LayerShellQt::Window::AnchorTop;
+	if (anchors.mBottom) lsAnchors |= LayerShellQt::Window::AnchorBottom;
+
+	if (!anchors.mLeft || !anchors.mRight) ProxyWindowBase::setWidth(this->requestedWidth);
+	if (!anchors.mTop || !anchors.mBottom) ProxyWindowBase::setHeight(this->requestedHeight);
+
+	this->shellWindow->setAnchors(lsAnchors);
+}
+
+Anchors ProxyShellWindow::anchors() const {
+	if (!this->complete) return this->stagingAnchors;
+
+	auto lsAnchors = this->shellWindow->anchors();
+
+	Anchors anchors;
+	anchors.mLeft = lsAnchors.testFlag(LayerShellQt::Window::AnchorLeft);
+	anchors.mRight = lsAnchors.testFlag(LayerShellQt::Window::AnchorRight);
+	anchors.mTop = lsAnchors.testFlag(LayerShellQt::Window::AnchorTop);
+	anchors.mBottom = lsAnchors.testFlag(LayerShellQt::Window::AnchorBottom);
+
+	return anchors;
+}
+
+void ProxyShellWindow::setExclusiveZone(qint32 zone) { this->shellWindow->setExclusiveZone(zone); }
+
+qint32 ProxyShellWindow::exclusiveZone() const { return this->shellWindow->exclusionZone(); }
+
+void ProxyShellWindow::setMargins(Margins margins) {
+	auto lsMargins = QMargins(margins.mLeft, margins.mTop, margins.mRight, margins.mBottom);
+	this->shellWindow->setMargins(lsMargins);
+}
+
+Margins ProxyShellWindow::margins() const {
+	auto lsMargins = this->shellWindow->margins();
+
+	auto margins = Margins();
+	margins.mLeft = lsMargins.left();
+	margins.mRight = lsMargins.right();
+	margins.mTop = lsMargins.top();
+	margins.mBottom = lsMargins.bottom();
+
+	return margins;
+}
+
+void ProxyShellWindow::setLayer(Layer::Enum layer) {
+	auto lsLayer = LayerShellQt::Window::LayerBackground;
+
+	// clang-format off
+	switch (layer) {
+	case Layer::Background: lsLayer = LayerShellQt::Window::LayerBackground; break;
+	case Layer::Bottom: lsLayer = LayerShellQt::Window::LayerBottom; break;
+	case Layer::Top: lsLayer = LayerShellQt::Window::LayerTop; break;
+	case Layer::Overlay: lsLayer = LayerShellQt::Window::LayerOverlay; break;
+	}
+	// clang-format on
+
+	this->shellWindow->setLayer(lsLayer);
+}
+
+Layer::Enum ProxyShellWindow::layer() const {
+	auto layer = Layer::Top;
+	auto lsLayer = this->shellWindow->layer();
+
+	// clang-format off
+	switch (lsLayer) {
+	case LayerShellQt::Window::LayerBackground: layer = Layer::Background; break;
+	case LayerShellQt::Window::LayerBottom: layer = Layer::Bottom; break;
+	case LayerShellQt::Window::LayerTop: layer = Layer::Top; break;
+	case LayerShellQt::Window::LayerOverlay: layer = Layer::Overlay; break;
+	}
+	// clang-format on
+
+	return layer;
+}
+
+void ProxyShellWindow::setScope(const QString& scope) { this->shellWindow->setScope(scope); }
+
+QString ProxyShellWindow::scope() const { return this->shellWindow->scope(); }
+
+void ProxyShellWindow::setKeyboardFocus(KeyboardFocus::Enum focus) {
+	auto lsFocus = LayerShellQt::Window::KeyboardInteractivityNone;
+
+	// clang-format off
+	switch (focus) {
+	case KeyboardFocus::None: lsFocus = LayerShellQt::Window::KeyboardInteractivityNone; break;
+	case KeyboardFocus::Exclusive: lsFocus = LayerShellQt::Window::KeyboardInteractivityExclusive; break;
+	case KeyboardFocus::OnDemand: lsFocus = LayerShellQt::Window::KeyboardInteractivityOnDemand; break;
+	}
+	// clang-format on
+
+	this->shellWindow->setKeyboardInteractivity(lsFocus);
+}
+
+KeyboardFocus::Enum ProxyShellWindow::keyboardFocus() const {
+	auto focus = KeyboardFocus::None;
+	auto lsFocus = this->shellWindow->keyboardInteractivity();
+
+	// clang-format off
+	switch (lsFocus) {
+	case LayerShellQt::Window::KeyboardInteractivityNone: focus = KeyboardFocus::None; break;
+	case LayerShellQt::Window::KeyboardInteractivityExclusive: focus = KeyboardFocus::Exclusive; break;
+	case LayerShellQt::Window::KeyboardInteractivityOnDemand: focus = KeyboardFocus::OnDemand; break;
+	}
+	// clang-format on
+
+	return focus;
+}
+
+void ProxyShellWindow::setScreenConfiguration(ScreenConfiguration::Enum configuration) {
+	auto lsConfiguration = LayerShellQt::Window::ScreenFromQWindow;
+
+	// clang-format off
+	switch (configuration) {
+	case ScreenConfiguration::Window: lsConfiguration = LayerShellQt::Window::ScreenFromQWindow; break;
+	case ScreenConfiguration::Compositor: lsConfiguration = LayerShellQt::Window::ScreenFromCompositor; break;
+	}
+	// clang-format on
+
+	this->shellWindow->setScreenConfiguration(lsConfiguration);
+}
+
+ScreenConfiguration::Enum ProxyShellWindow::screenConfiguration() const {
+	auto configuration = ScreenConfiguration::Window;
+	auto lsConfiguration = this->shellWindow->screenConfiguration();
+
+	// clang-format off
+	switch (lsConfiguration) {
+	case LayerShellQt::Window::ScreenFromQWindow: configuration = ScreenConfiguration::Window; break;
+	case LayerShellQt::Window::ScreenFromCompositor: configuration = ScreenConfiguration::Compositor; break;
+	}
+	// clang-format on
+
+	return configuration;
+}
+
+void ProxyShellWindow::setCloseOnDismissed(bool close) {
+	this->shellWindow->setCloseOnDismissed(close);
+}
+
+bool ProxyShellWindow::closeOnDismissed() const { return this->shellWindow->closeOnDismissed(); }

src/cpp/layershell.hpp

@@ -0,0 +1,166 @@
+#pragma once
+
+#include <LayerShellQt/window.h>
+#include <qobject.h>
+#include <qqmlintegration.h>
+#include <qqmllist.h>
+#include <qquickwindow.h>
+#include <qscreen.h>
+#include <qtmetamacros.h>
+#include <qtypes.h>
+#include <qvariant.h>
+#include <qwindow.h>
+
+#include "proxywindow.hpp"
+#include "qmlscreen.hpp"
+
+class Anchors {
+	Q_GADGET;
+	Q_PROPERTY(bool left MEMBER mLeft);
+	Q_PROPERTY(bool right MEMBER mRight);
+	Q_PROPERTY(bool top MEMBER mTop);
+	Q_PROPERTY(bool bottom MEMBER mBottom);
+
+public:
+	bool mLeft = false;
+	bool mRight = false;
+	bool mTop = false;
+	bool mBottom = false;
+};
+
+class Margins {
+	Q_GADGET;
+	Q_PROPERTY(qint32 left MEMBER mLeft);
+	Q_PROPERTY(qint32 right MEMBER mRight);
+	Q_PROPERTY(qint32 top MEMBER mTop);
+	Q_PROPERTY(qint32 bottom MEMBER mBottom);
+
+public:
+	qint32 mLeft = 0;
+	qint32 mRight = 0;
+	qint32 mTop = 0;
+	qint32 mBottom = 0;
+};
+
+namespace Layer { // NOLINT
+Q_NAMESPACE;
+QML_ELEMENT;
+
+enum Enum {
+	Background = 0,
+	Bottom = 1,
+	Top = 2,
+	Overlay = 3,
+};
+Q_ENUM_NS(Enum);
+
+} // namespace Layer
+
+namespace KeyboardFocus { // NOLINT
+Q_NAMESPACE;
+QML_ELEMENT;
+
+enum Enum {
+	None = 0,
+	Exclusive = 1,
+	OnDemand = 2,
+};
+Q_ENUM_NS(Enum);
+
+} // namespace KeyboardFocus
+
+namespace ScreenConfiguration { // NOLINT
+Q_NAMESPACE;
+QML_ELEMENT;
+
+enum Enum {
+	Window = 0,
+	Compositor = 1,
+};
+Q_ENUM_NS(Enum);
+
+} // namespace ScreenConfiguration
+
+class ProxyShellWindow: public ProxyWindowBase {
+	// clang-format off
+	Q_OBJECT;
+	Q_PROPERTY(QtShellScreenInfo* screen READ screen WRITE setScreen NOTIFY screenChanged);
+	Q_PROPERTY(Anchors anchors READ anchors WRITE setAnchors NOTIFY anchorsChanged);
+	Q_PROPERTY(qint32 exclusionZone READ exclusiveZone WRITE setExclusiveZone NOTIFY exclusionZoneChanged)
+	Q_PROPERTY(Margins margins READ margins WRITE setMargins NOTIFY marginsChanged)
+	Q_PROPERTY(Layer::Enum layer READ layer WRITE setLayer NOTIFY layerChanged)
+	Q_PROPERTY(QString scope READ scope WRITE setScope)
+	Q_PROPERTY(KeyboardFocus::Enum keyboardFocus READ keyboardFocus WRITE setKeyboardFocus NOTIFY keyboardFocusChanged)
+	Q_PROPERTY(ScreenConfiguration::Enum screenConfiguration READ screenConfiguration WRITE setScreenConfiguration)
+	Q_PROPERTY(bool closeOnDismissed READ closeOnDismissed WRITE setCloseOnDismissed);
+	Q_CLASSINFO("DefaultProperty", "data");
+	QML_ELEMENT;
+	// clang-format on
+
+protected:
+	void earlyInit(QObject* old) override;
+
+public:
+	void componentComplete() override;
+	QQuickWindow* disownWindow() override;
+
+	QQmlListProperty<QObject> data();
+
+	void setVisible(bool visible) override;
+	bool isVisible() override;
+
+	void setWidth(qint32 width) override;
+	qint32 width() override;
+
+	void setHeight(qint32 height) override;
+	qint32 height() override;
+
+	void setScreen(QtShellScreenInfo* screen);
+	[[nodiscard]] QtShellScreenInfo* screen() const;
+
+	void setAnchors(Anchors anchors);
+	[[nodiscard]] Anchors anchors() const;
+
+	void setExclusiveZone(qint32 zone);
+	[[nodiscard]] qint32 exclusiveZone() const;
+
+	void setMargins(Margins margins);
+	[[nodiscard]] Margins margins() const;
+
+	void setLayer(Layer::Enum layer);
+	[[nodiscard]] Layer::Enum layer() const;
+
+	void setScope(const QString& scope);
+	[[nodiscard]] QString scope() const;
+
+	void setKeyboardFocus(KeyboardFocus::Enum focus);
+	[[nodiscard]] KeyboardFocus::Enum keyboardFocus() const;
+
+	void setScreenConfiguration(ScreenConfiguration::Enum configuration);
+	[[nodiscard]] ScreenConfiguration::Enum screenConfiguration() const;
+
+	void setCloseOnDismissed(bool close);
+	[[nodiscard]] bool closeOnDismissed() const;
+
+signals:
+	void screenChanged();
+	void anchorsChanged();
+	void marginsChanged();
+	void exclusionZoneChanged();
+	void layerChanged();
+	void keyboardFocusChanged();
+
+private:
+	LayerShellQt::Window* shellWindow = nullptr;
+	bool anchorsInitialized = false;
+
+	// needed to ensure size dosent fuck up when changing layershell attachments
+	// along with setWidth and setHeight overrides
+	qint32 requestedWidth = 100;
+	qint32 requestedHeight = 100;
+
+	// width/height must be set before anchors, so we have to track anchors and apply them late
+	bool complete = false;
+	bool stagingVisible = false;
+	Anchors stagingAnchors;
+};

src/cpp/proxywindow.cpp

@@ -20,9 +20,17 @@ void ProxyWindowBase::earlyInit(QObject* old) {
 	} else {
 		this->window = oldpw->disownWindow();
 	}
+
+	// clang-format off
+	QObject::connect(this->window, &QWindow::visibilityChanged, this, &ProxyWindowBase::visibleChanged);
+	QObject::connect(this->window, &QWindow::widthChanged, this, &ProxyWindowBase::widthChanged);
+	QObject::connect(this->window, &QWindow::heightChanged, this, &ProxyWindowBase::heightChanged);
+	// clang-format on
 }
 
 QQuickWindow* ProxyWindowBase::disownWindow() {
+	QObject::disconnect(this->window, nullptr, this, nullptr);
+
 	auto data = this->data();
 	ProxyWindowBase::dataClear(&data);
 	data.clear(&data);

src/cpp/proxywindow.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <qcolor.h>
+#include <qevent.h>
 #include <qobject.h>
 #include <qqmllist.h>
 #include <qqmlparserstatus.h>
@@ -20,15 +21,16 @@
 class ProxyWindowBase: public Scavenger {
 	Q_OBJECT;
 	Q_PROPERTY(QQuickItem* item READ item CONSTANT);
-	Q_PROPERTY(bool visible READ isVisible WRITE setVisible);
-	Q_PROPERTY(qint32 width READ width WRITE setWidth);
-	Q_PROPERTY(qint32 height READ height WRITE setHeight);
+	Q_PROPERTY(bool visible READ isVisible WRITE setVisible NOTIFY visibleChanged);
+	Q_PROPERTY(qint32 width READ width WRITE setWidth NOTIFY widthChanged);
+	Q_PROPERTY(qint32 height READ height WRITE setHeight NOTIFY heightChanged);
 	Q_PROPERTY(QColor color READ color WRITE setColor);
 	Q_PROPERTY(QQmlListProperty<QObject> data READ data);
 	Q_CLASSINFO("DefaultProperty", "data");
 
 protected:
 	void earlyInit(QObject* old) override;
+	QQuickWindow* window = nullptr;
 
 public:
 	explicit ProxyWindowBase(QObject* parent = nullptr): Scavenger(parent) {}
@@ -40,17 +42,17 @@ public:
 	void operator=(ProxyWindowBase&&) = delete;
 
 	// Disown the backing window and delete all its children.
-	QQuickWindow* disownWindow();
+	virtual QQuickWindow* disownWindow();
 
 	QQuickItem* item();
 
-	bool isVisible();
+	virtual bool isVisible();
 	virtual void setVisible(bool value);
 
-	qint32 width();
+	virtual qint32 width();
 	virtual void setWidth(qint32 value);
 
-	qint32 height();
+	virtual qint32 height();
 	virtual void setHeight(qint32 value);
 
 	QColor color();
@@ -58,6 +60,11 @@ public:
 
 	QQmlListProperty<QObject> data();
 
+signals:
+	void visibleChanged(bool visible);
+	void widthChanged(qint32 width);
+	void heightChanged(qint32 width);
+
 private:
 	static QQmlListProperty<QObject> dataBacker(QQmlListProperty<QObject>* prop);
 	static void dataAppend(QQmlListProperty<QObject>* prop, QObject* obj);
@@ -66,8 +73,6 @@ private:
 	static void dataClear(QQmlListProperty<QObject>* prop);
 	static void dataReplace(QQmlListProperty<QObject>* prop, qsizetype i, QObject* obj);
 	static void dataRemoveLast(QQmlListProperty<QObject>* prop);
-
-	QQuickWindow* window = nullptr;
 };
 
 // qt attempts to resize the window but fails because wayland

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();
+}

src/cpp/qmlglobal.hpp

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <qcontainerfwd.h>
+#include <qobject.h>
+#include <qqmlintegration.h>
+#include <qqmllist.h>
+#include <qtmetamacros.h>
+#include <qtypes.h>
+
+#include "qmlscreen.hpp"
+
+class QtShellGlobal: public QObject {
+	Q_OBJECT;
+	Q_PROPERTY(QQmlListProperty<QtShellScreenInfo> screens READ screens NOTIFY screensChanged);
+	QML_SINGLETON;
+	QML_ELEMENT;
+
+public:
+	QtShellGlobal(QObject* parent = nullptr);
+
+	QQmlListProperty<QtShellScreenInfo> screens();
+
+signals:
+	void screensChanged();
+
+public slots:
+	void updateScreens();
+
+private:
+	static qsizetype screensCount(QQmlListProperty<QtShellScreenInfo>* prop);
+	static QtShellScreenInfo* screenAt(QQmlListProperty<QtShellScreenInfo>* prop, qsizetype i);
+
+	QVector<QtShellScreenInfo*> mScreens;
+};

src/cpp/qmlscreen.cpp

@@ -0,0 +1,84 @@
+#include "qmlscreen.hpp"
+
+#include <qdebug.h>
+#include <qlogging.h>
+#include <qnamespace.h>
+#include <qtypes.h>
+
+bool QtShellScreenInfo::operator==(QtShellScreenInfo& other) const {
+	return this->screen == other.screen;
+}
+
+void warnNull() { qWarning() << "attempted to use dangling screen object"; }
+
+QString QtShellScreenInfo::name() const {
+	if (this->screen == nullptr) {
+		warnNull();
+		return "{ DANGLING SCREEN POINTER }";
+	}
+
+	return this->screen->name();
+}
+
+qint32 QtShellScreenInfo::width() const {
+	if (this->screen == nullptr) {
+		warnNull();
+		return 0;
+	}
+
+	return this->screen->size().width();
+}
+
+qint32 QtShellScreenInfo::height() const {
+	if (this->screen == nullptr) {
+		warnNull();
+		return 0;
+	}
+
+	return this->screen->size().height();
+}
+
+qreal QtShellScreenInfo::pixelDensity() const {
+	if (this->screen == nullptr) {
+		warnNull();
+		return 0.0;
+	}
+
+	return this->screen->physicalDotsPerInch() / 25.4;
+}
+
+qreal QtShellScreenInfo::logicalPixelDensity() const {
+	if (this->screen == nullptr) {
+		warnNull();
+		return 0.0;
+	}
+
+	return this->screen->logicalDotsPerInch() / 25.4;
+}
+
+qreal QtShellScreenInfo::devicePixelRatio() const {
+	if (this->screen == nullptr) {
+		warnNull();
+		return 0.0;
+	}
+
+	return this->screen->devicePixelRatio();
+}
+
+Qt::ScreenOrientation QtShellScreenInfo::orientation() const {
+	if (this->screen == nullptr) {
+		warnNull();
+		return Qt::PrimaryOrientation;
+	}
+
+	return this->screen->orientation();
+}
+
+Qt::ScreenOrientation QtShellScreenInfo::primaryOrientation() const {
+	if (this->screen == nullptr) {
+		warnNull();
+		return Qt::PrimaryOrientation;
+	}
+
+	return this->screen->primaryOrientation();
+}

src/cpp/qmlscreen.hpp

@@ -0,0 +1,51 @@
+#pragma once
+
+#include <qnamespace.h>
+#include <qobject.h>
+#include <qqmlintegration.h>
+#include <qscreen.h>
+#include <qtmetamacros.h>
+#include <qtypes.h>
+
+// unfortunately QQuickScreenInfo is private.
+class QtShellScreenInfo: public QObject {
+	Q_OBJECT;
+	QML_ELEMENT;
+	QML_UNCREATABLE("QtShellScreenInfo can only be obtained via QtShell.screens");
+	// clang-format off
+	Q_PROPERTY(QString name READ name NOTIFY nameChanged);
+	Q_PROPERTY(qint32 width READ width NOTIFY widthChanged);
+	Q_PROPERTY(qint32 height READ height NOTIFY heightChanged);
+	Q_PROPERTY(qreal pixelDensity READ pixelDensity NOTIFY logicalPixelDensityChanged);
+	Q_PROPERTY(qreal logicalPixelDensity READ logicalPixelDensity NOTIFY logicalPixelDensityChanged);
+	Q_PROPERTY(qreal devicePixelRatio READ devicePixelRatio NOTIFY devicePixelRatioChanged);
+	Q_PROPERTY(Qt::ScreenOrientation orientation READ orientation NOTIFY orientationChanged);
+	Q_PROPERTY(Qt::ScreenOrientation primatyOrientation READ primaryOrientation NOTIFY primaryOrientationChanged);
+	// clang-format on
+
+public:
+	QtShellScreenInfo(QObject* parent, QScreen* screen): QObject(parent), screen(screen) {}
+
+	bool operator==(QtShellScreenInfo& other) const;
+
+	[[nodiscard]] QString name() const;
+	[[nodiscard]] qint32 width() const;
+	[[nodiscard]] qint32 height() const;
+	[[nodiscard]] qreal pixelDensity() const;
+	[[nodiscard]] qreal logicalPixelDensity() const;
+	[[nodiscard]] qreal devicePixelRatio() const;
+	[[nodiscard]] Qt::ScreenOrientation orientation() const;
+	[[nodiscard]] Qt::ScreenOrientation primaryOrientation() const;
+
+	QScreen* screen;
+
+signals:
+	void nameChanged();
+	void widthChanged();
+	void heightChanged();
+	void pixelDensityChanged();
+	void logicalPixelDensityChanged();
+	void devicePixelRatioChanged();
+	void orientationChanged();
+	void primaryOrientationChanged();
+};

src/cpp/scavenge.cpp

@@ -1,6 +1,7 @@
 #include "scavenge.hpp"
 
 #include <qcontainerfwd.h>
+#include <qlogging.h>
 #include <qobject.h>
 #include <qqmlcomponent.h>
 #include <qqmlengine.h>