xdg-shell/positioner: Replace edge bitfield with extended enum

Bitfields allowed for impossible combinations of anchor edges, such as
being on the left and right edge. Use of explicit enumerations means we
don't need to handle that case.

Signed-off-by: David Edmundson <davidedmundson@kde.org>
Reviewed-by: Jonas Ådahl <jadahl@gmail.com>

1 files changed, 34 insertions, 43 deletions

diff --git a/stable/xdg-shell/xdg-shell.xml b/stable/xdg-shell/xdg-shell.xml
index 29a2b46..366c7a6 100644
--- a/stable/xdg-shell/xdg-shell.xml
+++ b/stable/xdg-shell/xdg-shell.xml
@@ -179,63 +179,54 @@
       <arg name="height" type="int" summary="height of anchor rectangle"/>
     </request>
 
-    <enum name="anchor" bitfield="true">
-      <entry name="none" value="0"
-	     summary="the center of the anchor rectangle"/>
-      <entry name="top" value="1"
-	     summary="the top edge of the anchor rectangle"/>
-      <entry name="bottom" value="2"
-	     summary="the bottom edge of the anchor rectangle"/>
-      <entry name="left" value="4"
-	     summary="the left edge of the anchor rectangle"/>
-      <entry name="right" value="8"
-	     summary="the right edge of the anchor rectangle"/>
+    <enum name="anchor">
+      <entry name="none" value="0"/>
+      <entry name="top" value="1"/>
+      <entry name="bottom" value="2"/>
+      <entry name="left" value="3"/>
+      <entry name="right" value="4"/>
+      <entry name="top_left" value="5"/>
+      <entry name="bottom_left" value="6"/>
+      <entry name="top_right" value="7"/>
+      <entry name="bottom_right" value="8"/>
     </enum>
 
     <request name="set_anchor">
-      <description summary="set anchor rectangle anchor edges">
-	Defines a set of edges for the anchor rectangle. These are used to
-	derive an anchor point that the child surface will be positioned
-	relative to. If two orthogonal edges are specified (e.g. 'top' and
-	'left'), then the anchor point will be the intersection of the edges
-	(e.g. the top left position of the rectangle); otherwise, the derived
-	anchor point will be centered on the specified edge, or in the center of
-	the anchor rectangle if no edge is specified.
-
-	If two parallel anchor edges are specified (e.g. 'left' and 'right'),
-	the invalid_input error is raised.
+      <description summary="set anchor rectangle anchor">
+	Defines the anchor point for the anchor rectangle. The specified anchor
+	is used derive an anchor point that the child surface will be
+	positioned relative to. If a corner anchor is set (e.g. 'top_left' or
+	'bottom_right'), the anchor point will be at the specified corner;
+	otherwise, the derived anchor point will be centered on the specified
+	edge, or in the center of the anchor rectangle if no edge is specified.
       </description>
       <arg name="anchor" type="uint" enum="anchor"
-	   summary="bit mask of anchor edges"/>
+	   summary="anchor"/>
     </request>
 
-    <enum name="gravity" bitfield="true">
-      <entry name="none" value="0"
-	     summary="center over the anchor edge"/>
-      <entry name="top" value="1"
-	     summary="position above the anchor edge"/>
-      <entry name="bottom" value="2"
-	     summary="position below the anchor edge"/>
-      <entry name="left" value="4"
-	     summary="position to the left of the anchor edge"/>
-      <entry name="right" value="8"
-	     summary="position to the right of the anchor edge"/>
+    <enum name="gravity">
+      <entry name="none" value="0"/>
+      <entry name="top" value="1"/>
+      <entry name="bottom" value="2"/>
+      <entry name="left" value="3"/>
+      <entry name="right" value="4"/>
+      <entry name="top_left" value="5"/>
+      <entry name="bottom_left" value="6"/>
+      <entry name="top_right" value="7"/>
+      <entry name="bottom_right" value="8"/>
     </enum>
 
     <request name="set_gravity">
       <description summary="set child surface gravity">
 	Defines in what direction a surface should be positioned, relative to
-	the anchor point of the parent surface. If two orthogonal gravities are
-	specified (e.g. 'bottom' and 'right'), then the child surface will be
-	placed in the specified direction; otherwise, the child surface will be
-	centered over the anchor point on any axis that had no gravity
-	specified.
-
-	If two parallel gravities are specified (e.g. 'left' and 'right'), the
-	invalid_input error is raised.
+	the anchor point of the parent surface. If a corner gravity is
+	specified (e.g. 'bottom_right' or 'top_left'), then the child surface
+	will be placed towards the specified gravity; otherwise, the child
+	surface will be centered over the anchor point on any axis that had no
+	gravity specified.
       </description>
       <arg name="gravity" type="uint" enum="gravity"
-	   summary="bit mask of gravity directions"/>
+	   summary="gravity direction"/>
     </request>
 
     <enum name="constraint_adjustment" bitfield="true">