refactor(wayland): seperate cmake files for modularity

src/core/persistentprops.hpp

@@ -0,0 +1,57 @@
+#pragma once
+
+#include <qobject.h>
+#include <qqmlintegration.h>
+
+#include "reload.hpp"
+
+///! Object that holds properties that can persist across a config reload.
+/// PersistentProperties holds properties declated in it across a reload, which is
+/// often useful for things like keeping expandable popups open and styling them.
+///
+/// Below is an example of using `PersistentProperties` to keep track of the state
+/// of an expandable panel. When the configuration is reloaded, the `expanderOpen` property
+/// will be saved and the expandable panel will stay in the open/closed state.
+///
+/// ```qml
+/// PersistentProperties {
+///   id: persist
+///   reloadableId: "persistedStates"
+///
+///   property bool expanderOpen: false
+/// }
+///
+/// Button {
+///   id: expanderButton
+///   anchors.centerIn: parent
+///   text: "toggle expander"
+///   onClicked: persist.expanderOpen = !persist.expanderOpen
+/// }
+///
+/// Rectangle {
+///   anchors.top: expanderButton.bottom
+///   anchors.left: expanderButton.left
+///   anchors.right: expanderButton.right
+///   height: 100
+///
+///   color: "lightblue"
+///   visible: persist.expanderOpen
+/// }
+/// ```
+class PersistentProperties: public Reloadable {
+	Q_OBJECT;
+	QML_ELEMENT;
+
+public:
+	PersistentProperties(QObject* parent = nullptr): Reloadable(parent) {}
+
+	void onReload(QObject* oldInstance) override;
+
+signals:
+	/// Called every time the reload stage completes.
+	/// Will be called every time, including when nothing was loaded from an old instance.
+	void loaded();
+	/// Called every time the properties are reloaded.
+	/// Will not be called if no old instance was loaded.
+	void reloaded();
+};