update description from kwin

Add a new method that tells the surface whether to accomodate
exclusive zones set by other surfaces or not.
right until now this was possible by setting the eclusive zone of
this surface to the value of -1.
Besides being a magic number, it makes impossible for this surface to
set an exclusive zone by itself if we want to ignore other exclusive zones

src/interfaces/window.cpp

@@ -34,6 +34,7 @@ public:
     QMargins margins;
     Window::ScreenConfiguration screenConfiguration = Window::ScreenFromQWindow;
     bool closeOnDismissed = true;
+    Window::AnchorRect anchorRect = Window::AnchorRectWorkArea;
 };
 
 static QMap<QWindow *, Window *> s_map;
@@ -84,6 +85,21 @@ Window::Anchor Window::exclusiveEdge() const
     return d->exclusiveEdge;
 }
 
+Window::AnchorRect Window::anchorRect() const
+{
+    return d->anchorRect;
+}
+
+void Window::setAnchorRect(Window::AnchorRect anchorRect)
+{
+    if (d->anchorRect == anchorRect) {
+        return;
+    }
+
+    d->anchorRect = anchorRect;
+    Q_EMIT anchorRectChanged();
+}
+
 void Window::setMargins(const QMargins &margins)
 {
     if (d->margins != margins) {

src/interfaces/window.h

@@ -25,6 +25,7 @@ class LAYERSHELLQT_EXPORT Window : public QObject
     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(AnchorRect anchorRect READ anchorRect WRITE setAnchorRect NOTIFY anchorRectChanged)
     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)
@@ -42,6 +43,12 @@ public:
     Q_ENUM(Anchor);
     Q_DECLARE_FLAGS(Anchors, Anchor)
 
+    /**
+     * This enum is used to choose between anchoring to work area or screen area
+     */
+    enum AnchorRect { AnchorRectWorkArea = 0, AnchorRectFullArea = 1 };
+    Q_ENUM(AnchorRect);
+
     /**
      * This enum type is used to specify the layer where a surface can be put in.
      */
@@ -83,6 +90,9 @@ public:
     void setExclusiveEdge(Window::Anchor edge);
     Window::Anchor exclusiveEdge() const;
 
+    AnchorRect anchorRect() const;
+    void setAnchorRect(AnchorRect anchorRect);
+
     void setMargins(const QMargins &margins);
     QMargins margins() const;
 
@@ -126,6 +136,7 @@ Q_SIGNALS:
     void anchorsChanged();
     void exclusionZoneChanged();
     void exclusiveEdgeChanged();
+    void anchorRectChanged();
     void marginsChanged();
     void keyboardInteractivityChanged();
     void layerChanged();

src/qwaylandlayershellintegration.cpp

@@ -15,7 +15,7 @@
 namespace LayerShellQt
 {
 QWaylandLayerShellIntegration::QWaylandLayerShellIntegration()
-    : QWaylandShellIntegrationTemplate<QWaylandLayerShellIntegration>(5)
+    : QWaylandShellIntegrationTemplate<QWaylandLayerShellIntegration>(6)
     , m_xdgActivation(new QWaylandXdgActivationV1)
 {
 }

src/qwaylandlayersurface.cpp

@@ -56,6 +56,11 @@ QWaylandLayerSurface::QWaylandLayerSurface(QWaylandLayerShellIntegration *shell,
         setExclusiveEdge(m_interface->exclusiveEdge());
     });
 
+    setAnchorRect(m_interface->anchorRect());
+    connect(m_interface, &Window::anchorRectChanged, this, [this]() {
+        setAnchorRect(m_interface->anchorRect());
+    });
+
     setMargins(m_interface->margins());
     connect(m_interface, &Window::marginsChanged, this, [this]() {
         setMargins(m_interface->margins());
@@ -151,6 +156,13 @@ void QWaylandLayerSurface::setExclusiveEdge(uint32_t edge)
     }
 }
 
+void QWaylandLayerSurface::setAnchorRect(int32_t anchorRect)
+{
+    if (zwlr_layer_surface_v1_get_version(object()) >= ZWLR_LAYER_SURFACE_V1_SET_ANCHOR_RECT_SINCE_VERSION) {
+        set_anchor_rect(anchorRect);
+    }
+}
+
 void QWaylandLayerSurface::setMargins(const QMargins &margins)
 {
     set_margin(margins.top(), margins.right(), margins.bottom(), margins.left());

src/qwaylandlayersurface_p.h

@@ -8,6 +8,7 @@
 #ifndef _LAYERSURFACE_H
 #define _LAYERSURFACE_H
 
+#include <cstdint>
 #include <wayland-client.h>
 
 #include "qwaylandlayershellintegration_p.h"
@@ -38,6 +39,7 @@ public:
     void setAnchor(uint32_t anchor);
     void setExclusiveZone(int32_t zone);
     void setExclusiveEdge(uint32_t edge);
+    void setAnchorRect(int32_t anchorRect);
     void setMargins(const QMargins &margins);
     void setKeyboardInteractivity(uint32_t interactivity);
     void setLayer(uint32_t layer);

src/wlr-layer-shell-unstable-v1.xml

@@ -25,7 +25,7 @@
     THIS SOFTWARE.
   </copyright>
 
-  <interface name="zwlr_layer_shell_v1" version="5">
+  <interface name="zwlr_layer_shell_v1" version="6">
     <description summary="create surfaces that are layers of the desktop">
       Clients can use this interface to assign the surface_layer role to
       wl_surfaces. Such surfaces are assigned to a "layer" of the output and
@@ -100,7 +100,7 @@
     </request>
   </interface>
 
-  <interface name="zwlr_layer_surface_v1" version="5">
+  <interface name="zwlr_layer_surface_v1" version="6">
     <description summary="layer metadata interface">
       An interface that may be implemented by a wl_surface, for surfaces that
       are designed to be rendered as a layer of a stacked desktop-like
@@ -168,21 +168,25 @@
         Surfaces that do not wish to have an exclusive zone may instead specify
         how they should interact with surfaces that do. If set to zero, the
         surface indicates that it would like to be moved to avoid occluding
-        surfaces with a positive exclusive zone. If set to -1, the surface
+        surfaces with a positive exclusive zone.
-        indicates that it would not like to be moved to accommodate for other
-        surfaces, and the compositor should extend it all the way to the edges
-        it is anchored to.
 
         For example, a panel might set its exclusive zone to 10, so that
         maximized shell surfaces are not shown on top of it. A notification
         might set its exclusive zone to 0, so that it is moved to avoid
-        occluding the panel, but shell surfaces are shown underneath it. A
+        occluding the panel, but shell surfaces are shown underneath it.
-        wallpaper or lock screen might set their exclusive zone to -1, so that
-        they stretch below or over the panel.
 
         The default value is 0.
 
         Exclusive zone is double-buffered, see wl_surface.commit.
+
+        Since version 6 It must be a value of 0 or more, otherwise the error
+        invalid_exclusive_zone will be triggered.
+
+        Until version 5 if set to -1, the surface indicates that it would not
+        like to be moved to accommodate for other surfaces, and the compositor
+        should extend it all the way to the edges it is anchored to.
+        A wallpaper or lock screen might set their exclusive zone to -1, so that
+        they stretch below or over the panel.
       </description>
       <arg name="zone" type="int"/>
     </request>
@@ -368,6 +372,7 @@
       <entry name="invalid_anchor" value="2" summary="anchor bitfield is invalid"/>
       <entry name="invalid_keyboard_interactivity" value="3" summary="keyboard interactivity is invalid"/>
       <entry name="invalid_exclusive_edge" value="4" summary="exclusive edge is invalid given the surface anchors"/>
+      <entry name="invalid_exclusive_zone" value="5" summary="exclusive zone value is invalid, since version 6 it can't be less than zero"/>
     </enum>
 
     <enum name="anchor" bitfield="true">
@@ -403,5 +408,33 @@
       </description>
       <arg name="edge" type="uint"/>
     </request>
+
+    <!-- Version 6 additions -->
+
+    <enum name="anchor_rect">
+      <entry name="full_area" value="0" summary="the full area anchor rect">
+        <description summary="the full area anchor rect">
+          Place the layer_surface_v1 relative to the full output area.
+        </description>
+      </entry>
+      <entry name="work_area" value="1" summary="the work area anchor rect">
+        <description summary="the work area anchor rect">
+          Place the layer_surface_v1 relative to the output area while taking
+          the exclusive zone of other surfaces into account.
+        </description>
+      </entry>
+    </enum>
+
+    <request name="set_anchor_rect" since="6">
+      <description summary="set the anchor rect">
+        Set the anchor rectangle relative to which the anchors are applied.
+
+        By default, the layer_surface_v1 is anchored to the 'work_area'.
+
+        Anchor rect is double-buffered, see wl_surface.commit.
+      </description>
+      <arg name="rect" type="uint" enum="anchor_rect"/>
+    </request>
+
   </interface>
 </protocol>