Expose setDesiredSize to the C++ API

Making it possible for clients to call setDesiredSize directly,

The idea is that under Wayland, the panel calls this intead of setGeometry,
not trying to set an abosulute geometry that might cause the panel sized wrongly,
but just sets an hint which will ensure the panel won't overlap another one

src/interfaces/window.cpp

@@ -32,6 +32,7 @@ public:
     Window::KeyboardInteractivity keyboardInteractivity = Window::KeyboardInteractivityOnDemand;
     Window::Layer layer = Window::LayerTop;
     QMargins margins;
+    QSize desiredSize;
     Window::ScreenConfiguration screenConfiguration = Window::ScreenFromQWindow;
     bool closeOnDismissed = true;
 };
@@ -97,6 +98,21 @@ QMargins Window::margins() const
     return d->margins;
 }
 
+void Window::setDesiredSize(const QSize &size)
+{
+    if (size == d->desiredSize) {
+        return;
+    }
+
+    d->desiredSize = size;
+    Q_EMIT desiredSizeChanged();
+}
+
+QSize Window::desiredSize() const
+{
+    return d->desiredSize;
+}
+
 void Window::setKeyboardInteractivity(KeyboardInteractivity interactivity)
 {
     if (d->keyboardInteractivity != interactivity) {

src/interfaces/window.h

@@ -86,6 +86,9 @@ public:
     void setMargins(const QMargins &margins);
     QMargins margins() const;
 
+    void setDesiredSize(const QSize &size);
+    QSize desiredSize() const;
+
     void setKeyboardInteractivity(KeyboardInteractivity interactivity);
     KeyboardInteractivity keyboardInteractivity() const;
 
@@ -127,6 +130,7 @@ Q_SIGNALS:
     void exclusionZoneChanged();
     void exclusiveEdgeChanged();
     void marginsChanged();
+    void desiredSizeChanged();
     void keyboardInteractivityChanged();
     void layerChanged();
 

src/qwaylandlayersurface.cpp

@@ -44,7 +44,7 @@ QWaylandLayerSurface::QWaylandLayerSurface(QWaylandLayerShellIntegration *shell,
     setAnchor(m_interface->anchors());
     connect(m_interface, &Window::anchorsChanged, this, [this]() {
         setAnchor(m_interface->anchors());
-        setDesiredSize(m_window->windowContentGeometry().size());
+        m_interface->setDesiredSize(m_window->windowContentGeometry().size());
     });
 
     setExclusiveZone(m_interface->exclusionZone());
@@ -61,12 +61,17 @@ QWaylandLayerSurface::QWaylandLayerSurface(QWaylandLayerShellIntegration *shell,
         setMargins(m_interface->margins());
     });
 
+    // setDesiredSize is called only by this connection, everywhere else we use m_interface->setDesiredSize()
+    connect(m_interface, &Window::desiredSizeChanged, this, [this]() {
+        setDesiredSize(m_interface->desiredSize());
+    });
+
     setKeyboardInteractivity(m_interface->keyboardInteractivity());
     connect(m_interface, &Window::keyboardInteractivityChanged, this, [this]() {
         setKeyboardInteractivity(m_interface->keyboardInteractivity());
     });
 
-    setDesiredSize(window->windowContentGeometry().size());
+    m_interface->setDesiredSize(window->windowContentGeometry().size());
 }
 
 QWaylandLayerSurface::~QWaylandLayerSurface()
@@ -132,6 +137,8 @@ void QWaylandLayerSurface::setDesiredSize(const QSize &size)
         effectiveSize.setHeight(0);
     }
     set_size(effectiveSize.width(), effectiveSize.height());
+
+    m_window->window()->requestUpdate();
 }
 
 void QWaylandLayerSurface::setAnchor(uint anchor)
@@ -174,12 +181,12 @@ void QWaylandLayerSurface::setWindowGeometry(const QRect &geometry)
         return;
     }
 
-    setDesiredSize(geometry.size());
+    m_interface->setDesiredSize(geometry.size());
 }
 #else
 void QWaylandLayerSurface::setWindowSize(const QSize &size)
 {
-    setDesiredSize(size);
+    m_interface->setDesiredSize(size);
 }
 #endif
 

src/qwaylandlayersurface_p.h

@@ -34,7 +34,6 @@ public:
     }
     void attachPopup(QtWaylandClient::QWaylandShellSurface *popup) override;
 
-    void setDesiredSize(const QSize &size);
     void setAnchor(uint32_t anchor);
     void setExclusiveZone(int32_t zone);
     void setExclusiveEdge(uint32_t edge);
@@ -54,6 +53,7 @@ public:
     void requestXdgActivationToken(quint32 serial) override;
 
 private:
+    void setDesiredSize(const QSize &size);
     void sendExpose();
     void zwlr_layer_surface_v1_configure(uint32_t serial, uint32_t width, uint32_t height) override;
     void zwlr_layer_surface_v1_closed() override;