feat(wayland): custom layershell implementation

A fair amount of things are broken but not in the layershell interface
itself. The shell window platform extensions are next in line for
refactoring and relevent issues will be fixed then. Same for docs.

src/wayland/waylandshellwindow.hpp

@@ -0,0 +1,92 @@
+#pragma once
+
+#include <qobject.h>
+#include <qqmlengine.h>
+#include <qtypes.h>
+
+#include "../core/shellwindow.hpp"
+#include "layershell.hpp"
+
+class WaylandShellWindowExtensions;
+
+class WaylandShellWindow: public ProxyShellWindow {
+	Q_OBJECT;
+	Q_PROPERTY(WaylandShellWindowExtensions* wayland MEMBER mWayland CONSTANT);
+	QML_NAMED_ELEMENT(ShellWindow);
+
+public:
+	explicit WaylandShellWindow(QObject* parent = nullptr);
+
+	WaylandShellWindowExtensions* wayland();
+
+	void setupWindow() override;
+	QQuickWindow* disownWindow() override;
+
+	void setWidth(qint32 width) override;
+	void setHeight(qint32 height) override;
+
+	void setAnchors(Anchors anchors) override;
+	[[nodiscard]] Anchors anchors() const override;
+
+	void setExclusiveZone(qint32 zone) override;
+	[[nodiscard]] qint32 exclusiveZone() const override;
+
+	void setExclusionMode(ExclusionMode::Enum exclusionMode) override;
+	[[nodiscard]] ExclusionMode::Enum exclusionMode() const override;
+
+	void setMargins(Margins margins) override;
+	[[nodiscard]] Margins margins() const override;
+
+protected slots:
+	void updateExclusionZone();
+	void onWidthChanged() override;
+	void onHeightChanged() override;
+
+private:
+	WaylandShellWindowExtensions* mWayland = nullptr;
+
+	LayershellWindowExtension* windowExtension;
+	bool connected = false;
+
+	friend class WaylandShellWindowExtensions;
+};
+
+class WaylandShellWindowExtensions: public QObject {
+	Q_OBJECT;
+	// clang-format off
+	/// The shell layer the window sits in. Defaults to `Layer.Top`.
+	Q_PROPERTY(Layer::Enum layer READ layer WRITE setLayer NOTIFY layerChanged);
+	/// Similar to the class property of windows. Can be used to identify the window to external tools.
+	Q_PROPERTY(QString namespace READ ns WRITE setNamespace);
+	/// The degree of keyboard focus taken. Defaults to `KeyboardFocus.None`.
+	Q_PROPERTY(KeyboardFocus::Enum keyboardFocus READ keyboardFocus WRITE setKeyboardFocus NOTIFY keyboardFocusChanged);
+	// clang-format on
+	QML_ELEMENT;
+	QML_UNCREATABLE("WaylandShellWindowExtensions cannot be created");
+
+public:
+	explicit WaylandShellWindowExtensions(WaylandShellWindow* window)
+	    : QObject(window)
+	    , window(window) {}
+
+	void setLayer(Layer::Enum layer);
+	[[nodiscard]] Layer::Enum layer() const;
+
+	void setNamespace(const QString& ns);
+	[[nodiscard]] QString ns() const;
+
+	void setKeyboardFocus(KeyboardFocus::Enum focus);
+	[[nodiscard]] KeyboardFocus::Enum keyboardFocus() const;
+
+	void setScreenConfiguration(ScreenConfiguration::Enum configuration);
+	[[nodiscard]] ScreenConfiguration::Enum screenConfiguration() const;
+
+signals:
+	void layerChanged();
+	void keyboardFocusChanged();
+
+private:
+	WaylandShellWindow* window;
+
+	friend class WaylandShellWindow;
+};