Expose the Window interface to QML

If we are designing our UI's windows from QML, it makes sense that we
might want to configure how they're placed from the same place.

Everything was already in place but for a few technical bits which this
change adds.

Signed-off-by: Victoria Fischer <victoria.fischer@mbition.io>

src/interfaces/window.cpp

@@ -186,9 +186,18 @@ Window::Window(QWindow *window)
 
 Window *Window::get(QWindow *window)
 {
+    if (!window) {
+        return nullptr;
+    }
+
     auto layerShellWindow = s_map.value(window);
     if (layerShellWindow) {
         return layerShellWindow;
     }
     return new Window(window);
 }
+
+Window *Window::qmlAttachedProperties(QObject *object)
+{
+    return get(qobject_cast<QWindow *>(object));
+}

src/interfaces/window.h

@@ -25,6 +25,14 @@ class WindowPrivate;
 class LAYERSHELLQT_EXPORT Window : public QObject
 {
     Q_OBJECT
+    Q_PROPERTY(Anchors anchors READ anchors WRITE setAnchors NOTIFY anchorsChanged)
+    Q_PROPERTY(QString scope READ scope WRITE setScope)
+    Q_PROPERTY(QMargins margins READ margins WRITE setMargins NOTIFY marginsChanged)
+    Q_PROPERTY(qint32 exclusionZone READ exclusionZone WRITE setExclusiveZone NOTIFY exclusionZoneChanged)
+    Q_PROPERTY(Layer layer READ layer WRITE setLayer NOTIFY layerChanged)
+    Q_PROPERTY(KeyboardInteractivity keyboardInteractivity READ keyboardInteractivity WRITE setKeyboardInteractivity NOTIFY keyboardInteractivityChanged)
+    Q_PROPERTY(ScreenConfiguration screenConfiguration READ screenConfiguration WRITE setScreenConfiguration)
+
 public:
     ~Window() override;
 
@@ -116,6 +124,8 @@ public:
     static void attachPopup(QWindow *window, xdg_popup *popup);
 #endif
 
+    static Window *qmlAttachedProperties(QObject *object);
+
 Q_SIGNALS:
     void anchorsChanged();
     void exclusionZoneChanged();