Use change signals on Window interface class.

QWaylandLayerSurface pulled data from the Window on startup. The Window
pushed data into the QWaylandLayerSurface on changes. Having two
patterns is a sign of something being off.

This moves everything to a single design, pulling from the public
interface. This allows us to drop a code path that meddles with
QWaylandWindow internals.

src/interfaces/window.cpp

@@ -5,10 +5,9 @@
  */
 
 #include "window.h"
-#include "../qwaylandlayersurface_p.h"
 #include <layershellqt_logging.h>
-#include <private/qwaylandshellsurface_p.h>
-#include <private/qwaylandwindow_p.h>
+
+#include <QPointer>
 
 using namespace LayerShellQt;
 
@@ -27,7 +26,6 @@ public:
     Window::KeyboardInteractivity keyboardInteractivity = Window::KeyboardInteractivityExclusive;
     Window::Layer layer = Window::LayerTop;
     QMargins margins;
-    QWaylandLayerSurface *getSurface() const;
     QPointer<QScreen> desiredOutput;
 };
 
@@ -41,9 +39,7 @@ Window::~Window()
 void Window::setAnchors(Anchors anchors)
 {
     d->anchors = anchors;
-    if (auto surface = d->getSurface()) {
-        surface->setAnchor(anchors);
-    }
+    Q_EMIT anchorsChanged();
 }
 
 Window::Anchors Window::anchors() const
@@ -54,9 +50,7 @@ Window::Anchors Window::anchors() const
 void Window::setExclusiveZone(int32_t zone)
 {
     d->exclusionZone = zone;
-    if (auto surface = d->getSurface()) {
-        surface->setExclusiveZone(zone);
-    }
+    Q_EMIT exclusionZoneChanged();
 }
 
 int32_t Window::exclusionZone() const
@@ -67,9 +61,7 @@ int32_t Window::exclusionZone() const
 void Window::setMargins(const QMargins &margins)
 {
     d->margins = margins;
-    if (auto surface = d->getSurface()) {
-        surface->setMargins(margins);
-    }
+    Q_EMIT marginsChanged();
 }
 
 QMargins Window::margins() const
@@ -80,9 +72,7 @@ QMargins Window::margins() const
 void Window::setKeyboardInteractivity(KeyboardInteractivity interactivity)
 {
     d->keyboardInteractivity = interactivity;
-    if (auto surface = d->getSurface()) {
-        surface->setKeyboardInteractivity(interactivity);
-    }
+    Q_EMIT keyboardInteractivityChanged();
 }
 
 Window::KeyboardInteractivity Window::keyboardInteractivity() const
@@ -93,9 +83,6 @@ Window::KeyboardInteractivity Window::keyboardInteractivity() const
 void Window::setLayer(Layer layer)
 {
     d->layer = layer;
-    if (auto surface = d->getSurface()) {
-        surface->setLayer(layer);
-    }
 }
 
 void Window::setScope(const QString &scope)
@@ -139,21 +126,3 @@ Window *Window::get(QWindow *window)
     }
     return new Window(window);
 }
-
-QWaylandLayerSurface *WindowPrivate::getSurface() const
-{
-    if (!parentWindow) {
-        return nullptr;
-    }
-    auto ww = dynamic_cast<QtWaylandClient::QWaylandWindow *>(parentWindow->handle());
-    if (!ww) {
-        qCDebug(LAYERSHELLQT) << "window not a wayland window" << parentWindow;
-        return nullptr;
-    }
-    QWaylandLayerSurface *s = qobject_cast<QWaylandLayerSurface *>(ww->shellSurface());
-    if (!s) {
-        qCDebug(LAYERSHELLQT) << "window not using wlr-layer-shell" << parentWindow << ww->shellSurface();
-        return nullptr;
-    }
-    return s;
-}

src/interfaces/window.h

@@ -93,6 +93,13 @@ public:
      */
     static Window *get(QWindow *window);
 
+Q_SIGNALS:
+    void anchorsChanged();
+    void exclusionZoneChanged();
+    void marginsChanged();
+    void keyboardInteractivityChanged();
+    void layerChanged();
+
 private:
     Window(QWindow *window);
     QScopedPointer<WindowPrivate> d;

src/qwaylandlayersurface.cpp

@@ -36,15 +36,31 @@ QWaylandLayerSurface::QWaylandLayerSurface(QWaylandLayerShell *shell, QtWaylandC
         }
     }
     init(shell->get_layer_surface(window->waylandSurface()->object(), output, interface->layer(), interface->scope()));
-
-    Window::Anchors anchors = interface->anchors();
+    connect(interface, &Window::layerChanged, this, [this, interface]() {
+        setLayer(interface->layer());
+    });
 
     set_anchor(interface->anchors());
-    setMargins(interface->margins());
-    setKeyboardInteractivity(interface->keyboardInteractivity());
+    connect(interface, &Window::anchorsChanged, this, [this, interface]() {
+        set_anchor(interface->anchors());
+    });
     setExclusiveZone(interface->exclusionZone());
+    connect(interface, &Window::exclusionZoneChanged, this, [this, interface]() {
+        setExclusiveZone(interface->exclusionZone());
+    });
+
+    setMargins(interface->margins());
+    connect(interface, &Window::marginsChanged, this, [this, interface]() {
+        setMargins(interface->margins());
+    });
+
+    setKeyboardInteractivity(interface->keyboardInteractivity());
+    connect(interface, &Window::keyboardInteractivityChanged, this, [this, interface]() {
+        setKeyboardInteractivity(interface->keyboardInteractivity());
+    });
 
     QSize size = window->surfaceSize();
+    const Window::Anchors anchors = interface->anchors();
     if ((anchors & Window::AnchorLeft) && (anchors & Window::AnchorRight)) {
         size.setWidth(0);
     }