feat: implement soft reloading

src/cpp/proxywindow.hpp

@@ -0,0 +1,82 @@
+#pragma once
+
+#include <qcolor.h>
+#include <qobject.h>
+#include <qqmllist.h>
+#include <qqmlparserstatus.h>
+#include <qquickwindow.h>
+#include <qtmetamacros.h>
+#include <qtypes.h>
+
+#include "scavenge.hpp"
+
+// Proxy to an actual window exposing a limited property set with the ability to
+// transfer it to a new window.
+// Detaching a window and touching any property is a use after free.
+//
+// NOTE: setting an `id` in qml will point to the proxy window and not the real window so things
+// like anchors dont work
+class ProxyWindowBase: public Scavenger {
+	Q_OBJECT;
+	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(QColor color READ color WRITE setColor);
+	Q_PROPERTY(QQmlListProperty<QObject> data READ data);
+	Q_CLASSINFO("DefaultProperty", "data");
+
+protected:
+	void earlyInit(QObject* old) override;
+
+public:
+	explicit ProxyWindowBase(QObject* parent = nullptr): Scavenger(parent) {}
+	~ProxyWindowBase() override;
+
+	ProxyWindowBase(ProxyWindowBase&) = delete;
+	ProxyWindowBase(ProxyWindowBase&&) = delete;
+	void operator=(ProxyWindowBase&) = delete;
+	void operator=(ProxyWindowBase&&) = delete;
+
+	// Disown the backing window and delete all its children.
+	QQuickWindow* disownWindow();
+
+	bool isVisible();
+	virtual void setVisible(bool value);
+
+	qint32 width();
+	virtual void setWidth(qint32 value);
+
+	qint32 height();
+	virtual void setHeight(qint32 value);
+
+	QColor color();
+	void setColor(QColor value);
+
+	QQmlListProperty<QObject> data();
+
+private:
+	static QQmlListProperty<QObject> dataBacker(QQmlListProperty<QObject>* prop);
+	static void dataAppend(QQmlListProperty<QObject>* prop, QObject* obj);
+	static qsizetype dataCount(QQmlListProperty<QObject>* prop);
+	static QObject* dataAt(QQmlListProperty<QObject>* prop, qsizetype i);
+	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
+// and only resizes the graphics context which looks terrible.
+class ProxyFloatingWindow: public ProxyWindowBase {
+	Q_OBJECT;
+	QML_ELEMENT;
+
+public:
+	void setVisible(bool value) override;
+	void setWidth(qint32 value) override;
+	void setHeight(qint32 value) override;
+
+private:
+	bool geometryLocked = false;
+};