core: track ancestor position changes for item-based regions

Author: calops

src/core/region.cpp

@@ -32,6 +32,7 @@ void PendingRegion::setItem(QQuickItem* item) {
 
 	if (this->mItem != nullptr) {
 		QObject::disconnect(this->mItem, nullptr, this, nullptr);
+		this->disconnectParentChain();
 	}
 
 	this->mItem = item;
@@ -42,15 +43,41 @@ void PendingRegion::setItem(QQuickItem* item) {
 		QObject::connect(this->mItem, &QQuickItem::yChanged, this, &PendingRegion::itemChanged);
 		QObject::connect(this->mItem, &QQuickItem::widthChanged, this, &PendingRegion::itemChanged);
 		QObject::connect(this->mItem, &QQuickItem::heightChanged, this, &PendingRegion::itemChanged);
+		this->connectParentChain(item);
 	}
 
 	emit this->itemChanged();
 }
 
-void PendingRegion::onItemDestroyed() { this->mItem = nullptr; }
+void PendingRegion::onItemDestroyed() {
+	this->mItem = nullptr;
+	this->disconnectParentChain();
+}
 
 void PendingRegion::onChildDestroyed() { this->mRegions.removeAll(this->sender()); }
 
+void PendingRegion::connectParentChain(QQuickItem* item) {
+	this->disconnectParentChain();
+
+	auto* parent = item->parentItem();
+	while (parent != nullptr) {
+		this->mParentConnections.push_back(
+			QObject::connect(parent, &QQuickItem::xChanged, this, &PendingRegion::itemChanged)
+		);
+		this->mParentConnections.push_back(
+			QObject::connect(parent, &QQuickItem::yChanged, this, &PendingRegion::itemChanged)
+		);
+		parent = parent->parentItem();
+	}
+}
+
+void PendingRegion::disconnectParentChain() {
+	for (const auto& connection: this->mParentConnections) {
+		QObject::disconnect(connection);
+	}
+	this->mParentConnections.clear();
+}
+
 qint32 PendingRegion::radius() const { return this->mRadius; }
 
 void PendingRegion::setRadius(qint32 radius) {

src/core/region.hpp

@@ -177,6 +177,9 @@ private slots:
 	static void
 	regionsReplace(QQmlListProperty<PendingRegion>* prop, qsizetype i, PendingRegion* region);
 
+	void connectParentChain(QQuickItem* item);
+	void disconnectParentChain();
+
 	enum CornerOverride : quint8 {
 		TopLeft = 0b1,
 		TopRight = 0b10,
@@ -198,4 +201,5 @@ private slots:
 	quint8 mCornerOverrides = 0;
 
 	QList<PendingRegion*> mRegions;
+	QList<QMetaObject::Connection> mParentConnections;
 };