core/window: add QsWindow.devicePixelRatio

src/wayland/wlr_layershell.cpp

@@ -192,6 +192,7 @@ WaylandPanelInterface::WaylandPanelInterface(QObject* parent)
 	QObject::connect(this->layer, &ProxyWindowBase::backerVisibilityChanged, this, &WaylandPanelInterface::backingWindowVisibleChanged);
 	QObject::connect(this->layer, &ProxyWindowBase::heightChanged, this, &WaylandPanelInterface::heightChanged);
 	QObject::connect(this->layer, &ProxyWindowBase::widthChanged, this, &WaylandPanelInterface::widthChanged);
+	QObject::connect(this->layer, &ProxyWindowBase::devicePixelRatioChanged, this, &WaylandPanelInterface::devicePixelRatioChanged);
 	QObject::connect(this->layer, &ProxyWindowBase::screenChanged, this, &WaylandPanelInterface::screenChanged);
 	QObject::connect(this->layer, &ProxyWindowBase::windowTransformChanged, this, &WaylandPanelInterface::windowTransformChanged);
 	QObject::connect(this->layer, &ProxyWindowBase::colorChanged, this, &WaylandPanelInterface::colorChanged);
@@ -218,10 +219,13 @@ void WaylandPanelInterface::onReload(QObject* oldInstance) {
 QQmlListProperty<QObject> WaylandPanelInterface::data() { return this->layer->data(); }
 ProxyWindowBase* WaylandPanelInterface::proxyWindow() const { return this->layer; }
 QQuickItem* WaylandPanelInterface::contentItem() const { return this->layer->contentItem(); }
+
 bool WaylandPanelInterface::isBackingWindowVisible() const {
 	return this->layer->isVisibleDirect();
 }
 
+qreal WaylandPanelInterface::devicePixelRatio() const { return this->layer->devicePixelRatio(); }
+
 // NOLINTBEGIN
 #define proxyPair(type, get, set)                                                                  \
 	type WaylandPanelInterface::get() const { return this->layer->get(); }                           \

src/wayland/wlr_layershell.hpp

@@ -146,6 +146,8 @@ public:
 	[[nodiscard]] qint32 height() const override;
 	void setHeight(qint32 height) override;
 
+	[[nodiscard]] virtual qreal devicePixelRatio() const override;
+
 	[[nodiscard]] QuickshellScreenInfo* screen() const override;
 	void setScreen(QuickshellScreenInfo* screen) override;
 

src/window/floatingwindow.cpp

@@ -32,6 +32,7 @@ FloatingWindowInterface::FloatingWindowInterface(QObject* parent)
 	QObject::connect(this->window, &ProxyWindowBase::backerVisibilityChanged, this, &FloatingWindowInterface::backingWindowVisibleChanged);
 	QObject::connect(this->window, &ProxyWindowBase::heightChanged, this, &FloatingWindowInterface::heightChanged);
 	QObject::connect(this->window, &ProxyWindowBase::widthChanged, this, &FloatingWindowInterface::widthChanged);
+	QObject::connect(this->window, &ProxyWindowBase::devicePixelRatioChanged, this, &FloatingWindowInterface::devicePixelRatioChanged);
 	QObject::connect(this->window, &ProxyWindowBase::screenChanged, this, &FloatingWindowInterface::screenChanged);
 	QObject::connect(this->window, &ProxyWindowBase::windowTransformChanged, this, &FloatingWindowInterface::windowTransformChanged);
 	QObject::connect(this->window, &ProxyWindowBase::colorChanged, this, &FloatingWindowInterface::colorChanged);
@@ -50,10 +51,13 @@ void FloatingWindowInterface::onReload(QObject* oldInstance) {
 QQmlListProperty<QObject> FloatingWindowInterface::data() { return this->window->data(); }
 ProxyWindowBase* FloatingWindowInterface::proxyWindow() const { return this->window; }
 QQuickItem* FloatingWindowInterface::contentItem() const { return this->window->contentItem(); }
+
 bool FloatingWindowInterface::isBackingWindowVisible() const {
 	return this->window->isVisibleDirect();
 }
 
+qreal FloatingWindowInterface::devicePixelRatio() const { return this->window->devicePixelRatio(); }
+
 // NOLINTBEGIN
 #define proxyPair(type, get, set)                                                                  \
 	type FloatingWindowInterface::get() const { return this->window->get(); }                        \

src/window/floatingwindow.hpp

@@ -42,6 +42,8 @@ public:
 	[[nodiscard]] qint32 height() const override;
 	void setHeight(qint32 height) override;
 
+	[[nodiscard]] virtual qreal devicePixelRatio() const override;
+
 	[[nodiscard]] QuickshellScreenInfo* screen() const override;
 	void setScreen(QuickshellScreenInfo* screen) override;
 

src/window/proxywindow.cpp

@@ -1,6 +1,7 @@
 #include "proxywindow.hpp"
 
 #include <private/qquickwindow_p.h>
+#include <qcoreevent.h>
 #include <qevent.h>
 #include <qnamespace.h>
 #include <qobject.h>
@@ -191,6 +192,7 @@ void ProxyWindowBase::connectWindow() {
 	QObject::connect(this->window, &QWindow::screenChanged, this, &ProxyWindowBase::screenChanged);
 	QObject::connect(this->window, &QQuickWindow::colorChanged, this, &ProxyWindowBase::colorChanged);
 	QObject::connect(this->window, &ProxiedWindow::exposed, this, &ProxyWindowBase::runLints);
+	QObject::connect(this->window, &ProxiedWindow::devicePixelRatioChanged, this, &ProxyWindowBase::devicePixelRatioChanged);
 	// clang-format on
 }
 
@@ -213,6 +215,7 @@ void ProxyWindowBase::completeWindow() {
 	emit this->yChanged();
 	emit this->widthChanged();
 	emit this->heightChanged();
+	emit this->devicePixelRatioChanged();
 
 	this->mContentItem->setParentItem(this->window->contentItem());
 	this->mContentItem->setWidth(this->width());
@@ -411,6 +414,12 @@ void ProxyWindowBase::setSurfaceFormat(QsSurfaceFormat format) {
 	emit this->surfaceFormatChanged();
 }
 
+qreal ProxyWindowBase::devicePixelRatio() const {
+	if (this->window != nullptr) return this->window->devicePixelRatio();
+	if (this->mScreen != nullptr) return this->mScreen->devicePixelRatio();
+	return 1.0;
+}
+
 void ProxyWindowBase::onMaskChanged() {
 	if (this->window != nullptr) this->updateMask();
 }
@@ -456,6 +465,14 @@ void ProxyWindowAttached::setWindow(ProxyWindowBase* window) {
 	emit this->windowChanged();
 }
 
+bool ProxiedWindow::event(QEvent* event) {
+	if (event->type() == QEvent::DevicePixelRatioChange) {
+		emit this->devicePixelRatioChanged();
+	}
+
+	return this->QQuickWindow::event(event);
+}
+
 void ProxiedWindow::exposeEvent(QExposeEvent* event) {
 	this->QQuickWindow::exposeEvent(event);
 	emit this->exposed();

src/window/proxywindow.hpp

@@ -44,6 +44,7 @@ class ProxyWindowBase: public Reloadable {
 	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(qreal devicePixelRatio READ devicePixelRatio NOTIFY devicePixelRatioChanged);
 	Q_PROPERTY(QuickshellScreenInfo* screen READ screen WRITE setScreen NOTIFY screenChanged);
 	Q_PROPERTY(QColor color READ color WRITE setColor NOTIFY colorChanged);
 	Q_PROPERTY(PendingRegion* mask READ mask WRITE setMask NOTIFY maskChanged);
@@ -97,6 +98,8 @@ public:
 	[[nodiscard]] virtual qint32 height() const;
 	virtual void setHeight(qint32 height);
 
+	[[nodiscard]] qreal devicePixelRatio() const;
+
 	[[nodiscard]] virtual QuickshellScreenInfo* screen() const;
 	virtual void setScreen(QuickshellScreenInfo* screen);
 
@@ -122,6 +125,7 @@ signals:
 	void yChanged();
 	void widthChanged();
 	void heightChanged();
+	void devicePixelRatioChanged();
 	void windowTransformChanged();
 	void screenChanged();
 	void colorChanged();
@@ -192,8 +196,10 @@ public:
 
 signals:
 	void exposed();
+	void devicePixelRatioChanged();
 
 protected:
+	bool event(QEvent* event) override;
 	void exposeEvent(QExposeEvent* event) override;
 
 private:

src/window/windowinterface.hpp

@@ -55,6 +55,12 @@ class WindowInterface: public Reloadable {
 	Q_PROPERTY(bool backingWindowVisible READ isBackingWindowVisible NOTIFY backingWindowVisibleChanged);
 	Q_PROPERTY(qint32 width READ width WRITE setWidth NOTIFY widthChanged);
 	Q_PROPERTY(qint32 height READ height WRITE setHeight NOTIFY heightChanged);
+	/// The ratio between logical pixels and monitor pixels.
+	///
+	/// Qt's coordinate system works in logical pixels, which equal N monitor pixels
+	/// depending on scale factor. This property returns the amount of monitor pixels
+	/// in a logical pixel for the current window.
+	Q_PROPERTY(qreal devicePixelRatio READ devicePixelRatio NOTIFY devicePixelRatioChanged);
 	/// The screen that the window currently occupies.
 	///
 	/// This may be modified to move the window to the given screen.
@@ -147,6 +153,8 @@ public:
 	[[nodiscard]] virtual qint32 height() const = 0;
 	virtual void setHeight(qint32 height) = 0;
 
+	[[nodiscard]] virtual qreal devicePixelRatio() const = 0;
+
 	[[nodiscard]] virtual QuickshellScreenInfo* screen() const = 0;
 	virtual void setScreen(QuickshellScreenInfo* screen) = 0;
 
@@ -171,6 +179,7 @@ signals:
 	void backingWindowVisibleChanged();
 	void widthChanged();
 	void heightChanged();
+	void devicePixelRatioChanged();
 	void screenChanged();
 	void windowTransformChanged();
 	void colorChanged();

src/x11/panel_window.cpp

@@ -478,6 +478,7 @@ XPanelInterface::XPanelInterface(QObject* parent)
 	QObject::connect(this->panel, &ProxyWindowBase::backerVisibilityChanged, this, &XPanelInterface::backingWindowVisibleChanged);
 	QObject::connect(this->panel, &ProxyWindowBase::heightChanged, this, &XPanelInterface::heightChanged);
 	QObject::connect(this->panel, &ProxyWindowBase::widthChanged, this, &XPanelInterface::widthChanged);
+	QObject::connect(this->panel, &ProxyWindowBase::devicePixelRatioChanged, this, &XPanelInterface::devicePixelRatioChanged);
 	QObject::connect(this->panel, &ProxyWindowBase::screenChanged, this, &XPanelInterface::screenChanged);
 	QObject::connect(this->panel, &ProxyWindowBase::windowTransformChanged, this, &XPanelInterface::windowTransformChanged);
 	QObject::connect(this->panel, &ProxyWindowBase::colorChanged, this, &XPanelInterface::colorChanged);
@@ -505,6 +506,7 @@ QQmlListProperty<QObject> XPanelInterface::data() { return this->panel->data();
 ProxyWindowBase* XPanelInterface::proxyWindow() const { return this->panel; }
 QQuickItem* XPanelInterface::contentItem() const { return this->panel->contentItem(); }
 bool XPanelInterface::isBackingWindowVisible() const { return this->panel->isVisibleDirect(); }
+qreal XPanelInterface::devicePixelRatio() const { return this->panel->devicePixelRatio(); }
 
 // NOLINTBEGIN
 #define proxyPair(type, get, set)                                                                  \

src/x11/panel_window.hpp

@@ -127,6 +127,8 @@ public:
 	[[nodiscard]] qint32 height() const override;
 	void setHeight(qint32 height) override;
 
+	[[nodiscard]] virtual qreal devicePixelRatio() const override;
+
 	[[nodiscard]] QuickshellScreenInfo* screen() const override;
 	void setScreen(QuickshellScreenInfo* screen) override;