[PATCH wayland-protocols v2] Introduce xdg-foreign protocol
Jonas Ådahl
jadahl at gmail.com
Wed Jul 27 07:54:58 UTC 2016
xdg-foreign is a protocol meant to enable setting up inter surface
relationships across clients. Potential use cases are out-of-process
dialogs, such as file dialogs, meant to be used by sandboxed processes
that may not have the access it needs to implement such dialogs.
It works by enabling a client to export a surface, creating a handle
for the exported surface. The handle, in form of a unique string, may
be shared in some way with other clients (for example the provider of
the file dialog) which can then import the exported surface.
Signed-off-by: Jonas Ådahl <jadahl at gmail.com>
---
Changes since v1:
- Spelling and grammar fixes
- Wording changes (unexport -> revoke)
- Fixed the "Warning! .. unstable .." paragraph (was an old version)
- Added sandbox client -> unsandboxed file browser dialog example to protocol
description
- Removed left-over note about restriction of importing a handle only once. It
should be possible to import a handle multiple times, but the protocol text
had only been updated in one of two places.
Jonas
Makefile.am | 1 +
unstable/xdg-foreign/README | 4 +
unstable/xdg-foreign/xdg-foreign-unstable-v1.xml | 186 +++++++++++++++++++++++
3 files changed, 191 insertions(+)
create mode 100644 unstable/xdg-foreign/README
create mode 100644 unstable/xdg-foreign/xdg-foreign-unstable-v1.xml
diff --git a/Makefile.am b/Makefile.am
index 9e2a029..35df201 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -9,6 +9,7 @@ unstable_protocols = \
unstable/pointer-constraints/pointer-constraints-unstable-v1.xml \
unstable/tablet/tablet-unstable-v1.xml \
unstable/tablet/tablet-unstable-v2.xml \
+ unstable/xdg-foreign/xdg-foreign-unstable-v1.xml \
$(NULL)
stable_protocols = \
diff --git a/unstable/xdg-foreign/README b/unstable/xdg-foreign/README
new file mode 100644
index 0000000..f5bcb83
--- /dev/null
+++ b/unstable/xdg-foreign/README
@@ -0,0 +1,4 @@
+xdg foreign protocol
+
+Maintainers:
+Jonas Ådahl <jadahl at gmail.com>
diff --git a/unstable/xdg-foreign/xdg-foreign-unstable-v1.xml b/unstable/xdg-foreign/xdg-foreign-unstable-v1.xml
new file mode 100644
index 0000000..c6f5775
--- /dev/null
+++ b/unstable/xdg-foreign/xdg-foreign-unstable-v1.xml
@@ -0,0 +1,186 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="xdg_foreign_unstable_v1">
+
+ <copyright>
+ Copyright © 2015-2016 Red Hat Inc.
+
+ Permission is hereby granted, free of charge, to any person obtaining a
+ copy of this software and associated documentation files (the "Software"),
+ to deal in the Software without restriction, including without limitation
+ the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ and/or sell copies of the Software, and to permit persons to whom the
+ Software is furnished to do so, subject to the following conditions:
+
+ The above copyright notice and this permission notice (including the next
+ paragraph) shall be included in all copies or substantial portions of the
+ Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ DEALINGS IN THE SOFTWARE.
+ </copyright>
+
+ <description summary="Protocol for exporting xdg surface handles">
+ This protocol specifies a way for making it possible to reference a surface
+ of a different client. With such a reference, a client can, by using the
+ interfaces provided by this protocol, manipulate the relationship between
+ its own surfaces and the surface of some other client. For example, stack
+ some of its own surface above the other clients surface.
+
+ In order for a client A to get a reference of a surface of client B, client
+ B must first export its surface using xdg_exporter.export. Upon doing this,
+ client B will receive a handle (a unique string) that it may share with
+ client A in some way (for example D-Bus). After client A has received the
+ handle from client B, it may use xdg_importer.import to create a reference
+ to the surface client B just exported. See the corresponding requests for
+ details.
+
+ A possible use case for this is out-of-process dialogs. For example when a
+ sandboxed client without file system access needs the user to select a file
+ on the file system, given sandbox environment support, it can export its
+ surface, passing the exported surface handle to an unsandboxed process that
+ can show a file browser dialog and stack it above the sandboxed client's
+ surface.
+
+ Warning! The protocol described in this file is experimental and backward
+ incompatible changes may be made. Backward compatible changes may be added
+ together with the corresponding interface version bump. Backward
+ incompatible changes are done by bumping the version number in the protocol
+ and interface names and resetting the interface version. Once the protocol
+ is to be declared stable, the 'z' prefix and the version number in the
+ protocol and interface names are removed and the interface version number is
+ reset.
+ </description>
+
+ <interface name="zxdg_exporter_v1" version="1">
+ <description summary="interface for exporting surfaces">
+ A global interface used for exporting surfaces that can later be imported
+ using xdg_importer.
+ </description>
+
+ <request name="destroy" type="destructor">
+ <description summary="destroy the xdg_exporter object">
+ Notify the compositor that the xdg_exporter object will no longer be
+ used.
+ </description>
+ </request>
+
+ <request name="export">
+ <description summary="export a surface">
+ The export request exports the passed surface so that it can later be
+ imported via xdg_importer. When called, a new xdg_exported object will
+ be created and xdg_exported.handle will be sent immediately. See the
+ corresponding interface and event for details.
+
+ A surface may be exported multiple times, and each exported handle may
+ be used to create a xdg_imported multiple times. Only xdg_surface
+ surfaces may be exported.
+ </description>
+
+ <arg name="id" type="new_id" interface="zxdg_exported_v1"
+ summary="the new xdg_exported object"/>
+ <arg name="surface" type="object" interface="wl_surface"
+ summary="the surface to export"/>
+ </request>
+ </interface>
+
+ <interface name="zxdg_importer_v1" version="1">
+ <description summary="interface for importing surfaces">
+ A global interface used for importing surfaces exported by xdg_exporter.
+ With this interface, a client can create a reference to a surface of
+ another client.
+ </description>
+
+ <request name="destroy" type="destructor">
+ <description summary="destroy the xdg_importer object">
+ Notify the compositor that the xdg_importer object will no longer be
+ used.
+ </description>
+ </request>
+
+ <request name="import">
+ <description summary="import a surface">
+ The import request imports a surface from any client given a handle
+ retrieved by exporting said surface using xdg_exporter.export. When
+ called, a new xdg_imported object will be created. This new object
+ represents the imported surface, and the importing client can
+ manipulate its relationship using it. See xdg_imported for details.
+ </description>
+
+ <arg name="id" type="new_id" interface="zxdg_imported_v1"
+ summary="the new xdg_imported object"/>
+ <arg name="handle" type="string"
+ summary="the exported surface handle"/>
+ </request>
+ </interface>
+
+ <interface name="zxdg_exported_v1" version="1">
+ <description summary="an exported surface handle">
+ A xdg_exported object represents an exported reference to a surface. The
+ exported surface may be referenced as long as the xdg_exported object not
+ destroyed. Destroying the xdg_exported invalidates any relationship the
+ importer may have established using xdg_imported.
+ </description>
+
+ <request name="destroy" type="destructor">
+ <description summary="unexport the exported surface">
+ Revoke the previously exported surface. This invalidates any
+ relationship the importer may have set up using the xdg_imported created
+ given the handle sent via xdg_exported.handle.
+ </description>
+ </request>
+
+ <event name="handle">
+ <description summary="the exported surface handle">
+ The handle event contains the unique handle of this exported surface
+ reference. It may be shared with any client, which then can use it to
+ import the surface by calling xdg_importer.import. A handle may be
+ used to import the surface multiple times.
+ </description>
+
+ <arg name="handle" type="string" summary="the exported surface handle"/>
+ </event>
+ </interface>
+
+ <interface name="zxdg_imported_v1" version="1">
+ <description summary="an imported surface handle">
+ A xdg_imported object represents an imported reference to surface exported
+ by some client. A client can use this interface to manipulate
+ relationships between its own surfaces and the imported surface.
+ </description>
+
+ <request name="destroy" type="destructor">
+ <description summary="destroy the xdg_imported object">
+ Notify the compositor that it will no longer use the xdg_imported
+ object. Any relationship that may have been set up will at this point
+ be invalidated.
+ </description>
+ </request>
+
+ <request name="set_parent_of">
+ <description summary="set as the parent of some surface">
+ Set the imported surface as the parent of some surface of the client.
+ The passed surface must be a toplevel xdg_surface. Calling this function
+ sets up a surface to surface relation with the same stacking and positioning
+ semantics as xdg_surface.set_parent.
+ </description>
+
+ <arg name="surface" type="object" interface="wl_surface"
+ summary="the child surface"/>
+ </request>
+
+ <event name="destroyed">
+ <description summary="the imported surface handle has been destroyed">
+ The imported surface handle has been destroyed and any relationship set
+ up has been invalidated. This may happen for various reasons, for
+ example if the exported surface or the exported surface handle has been
+ destroyed, if the handle used for importing was invalid.
+ </description>
+ </event>
+ </interface>
+
+</protocol>
--
2.7.4
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