core/easingcurve: add EasingCurve type

src/core/CMakeLists.txt

@@ -21,6 +21,7 @@ qt_add_library(quickshell-core STATIC
 	qsintercept.cpp
 	incubator.cpp
 	lazyloader.cpp
+	easingcurve.cpp
 )
 
 set_source_files_properties(main.cpp PROPERTIES COMPILE_DEFINITIONS GIT_REVISION="${GIT_REVISION}")

src/core/easingcurve.cpp

@@ -0,0 +1,33 @@
+#include "easingcurve.hpp"
+#include <utility>
+
+#include <qeasingcurve.h>
+#include <qpoint.h>
+#include <qrect.h>
+#include <qtmetamacros.h>
+#include <qtypes.h>
+
+qreal EasingCurve::valueAt(qreal x) const { return this->mCurve.valueForProgress(x); }
+
+qreal EasingCurve::interpolate(qreal x, qreal a, qreal b) const {
+	return a + (b - a) * this->valueAt(x);
+}
+
+QPointF EasingCurve::interpolate(qreal x, const QPointF& a, const QPointF& b) const {
+	return QPointF(this->interpolate(x, a.x(), b.x()), this->interpolate(x, a.y(), b.y()));
+}
+
+QRectF EasingCurve::interpolate(qreal x, const QRectF& a, const QRectF& b) const {
+	return QRectF(
+	    this->interpolate(x, a.topLeft(), b.topLeft()),
+	    this->interpolate(x, a.bottomRight(), b.bottomRight())
+	);
+}
+
+QEasingCurve EasingCurve::curve() const { return this->mCurve; }
+
+void EasingCurve::setCurve(QEasingCurve curve) {
+	if (this->mCurve == curve) return;
+	this->mCurve = std::move(curve);
+	emit this->curveChanged();
+}

src/core/easingcurve.hpp

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <qeasingcurve.h>
+#include <qobject.h>
+#include <qpoint.h>
+#include <qqmlintegration.h>
+#include <qrect.h>
+#include <qtmetamacros.h>
+
+///! Easing curve.
+/// Directly accessible easing curve as used in property animations.
+class EasingCurve: public QObject {
+	Q_OBJECT;
+	/// Easing curve settings. Works exactly the same as
+	/// [PropertyAnimation.easing](https://doc.qt.io/qt-6/qml-qtquick-propertyanimation.html#easing-prop).
+	Q_PROPERTY(QEasingCurve curve READ curve WRITE setCurve NOTIFY curveChanged);
+	QML_ELEMENT;
+
+public:
+	EasingCurve(QObject* parent = nullptr): QObject(parent) {}
+
+	/// Returns the Y value for the given X value on the curve
+	/// from 0.0 to 1.0.
+	Q_INVOKABLE [[nodiscard]] qreal valueAt(qreal x) const;
+	/// Interpolates between two values using the given X coordinate.
+	Q_INVOKABLE [[nodiscard]] qreal interpolate(qreal x, qreal a, qreal b) const;
+	/// Interpolates between two points using the given X coordinate.
+	Q_INVOKABLE [[nodiscard]] QPointF interpolate(qreal x, const QPointF& a, const QPointF& b) const;
+	/// Interpolates two rects using the given X coordinate.
+	Q_INVOKABLE [[nodiscard]] QRectF interpolate(qreal x, const QRectF& a, const QRectF& b) const;
+
+	[[nodiscard]] QEasingCurve curve() const;
+	void setCurve(QEasingCurve curve);
+
+signals:
+	void curveChanged();
+
+private:
+	QEasingCurve mCurve;
+};

src/core/module.md

@@ -15,5 +15,6 @@ headers = [
 	"popupwindow.hpp",
 	"singleton.hpp",
 	"lazyloader.hpp",
+	"easingcurve.hpp",
 ]
 -----