[PATCH wayland-protocols v3 09/17] xdg-shell/toplevel: Chain multiple parent-child relationships

Jonas Ådahl jadahl at gmail.com
Wed Nov 15 11:19:58 UTC 2017

Change the semantics of xdg_toplevel.set_parent to allow chaining
multiple parent-child relationships together, while allowing
arbitrarily unmapping parents, while keeping what is left over of the
chain intact.

This makes things easier to manage when parent-child relationships
cross client borders, for example when using xdg_foreign.

Signed-off-by: Jonas Ådahl <jadahl at gmail.com>
Signed-off-by: Mike Blumenkrantz <zmike at osg.samsung.com>
 stable/xdg-shell/xdg-shell.xml | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/stable/xdg-shell/xdg-shell.xml b/stable/xdg-shell/xdg-shell.xml
index b119cff..4c4c66b 100644
--- a/stable/xdg-shell/xdg-shell.xml
+++ b/stable/xdg-shell/xdg-shell.xml
@@ -540,9 +540,8 @@
     <request name="set_parent">
       <description summary="set the parent of this surface">
-	Set the "parent" of this surface. This window should be stacked
-	above a parent. The parent surface must be mapped as long as this
-	surface is mapped.
+	Set the "parent" of this surface. This surface should be stacked
+	this above the parent surface and all other ancestor surfaces.
 	Parent windows should be set on dialogs, toolboxes, or other
 	"auxiliary" surfaces, so that the parent is raised when the dialog
@@ -551,6 +550,12 @@
 	Setting a null parent for a child window removes any parent-child
 	relationship for the child. Setting a null parent for a window which
 	currently has no parent is a no-op.
+	If the parent is unmapped then its children are managed as
+	though the parent of the now-unmapped parent has become the
+	parent of this surface. If no parent exists for the now-unmapped
+	parent then the children are managed as though they have no
+	parent surface.
       <arg name="parent" type="object" interface="xdg_toplevel" allow-null="true"/>

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