[RFC wayland-protocols v4] Add Primary Selection Protocol Version 1
Carlos Garnacho
carlosg at gnome.org
Sat Feb 20 00:31:59 UTC 2016
From: Lyude <cpaul at redhat.com>
This primary selection is similar in spirit to the eponimous
in X11, allowing a quick "select text + middle click" shortcut
to copying and pasting.
It's otherwise very similar to it wayland counterpart, and
explicitly made consistent with it.
Signed-off-by: Lyude <cpaul at redhat.com>
Signed-off-by: Carlos Garnacho <carlosg at gnome.org>
---
After having talked with Lyude, I'll be trying to move this ahead.
Changes since v3:
- Added a rather verbose protocol description, including a
high-level overview of the workings.
- Made event emission 1:1 with wayland core protocol selections,
wp_primary_selection_offer.offer events are now expected to be
emitted between wp_primary_data_device.data_offer and
wp_primary_data_device.selection
- Improved wording here and there.
- Added serial argument to wp_primary_data_offer.receive that can be
used to match against recent events.
Makefile.am | 1 +
unstable/primary-selection/README | 4 +
.../primary-selection-unstable-v1.xml | 229 +++++++++++++++++++++
3 files changed, 234 insertions(+)
create mode 100644 unstable/primary-selection/README
create mode 100644 unstable/primary-selection/primary-selection-unstable-v1.xml
diff --git a/Makefile.am b/Makefile.am
index 57d0023..eefa20f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -7,6 +7,7 @@ unstable_protocols = \
unstable/xdg-shell/xdg-shell-unstable-v5.xml \
unstable/relative-pointer/relative-pointer-unstable-v1.xml \
unstable/pointer-constraints/pointer-constraints-unstable-v1.xml \
+ unstable/primary-selection/primary-selection-unstable-v1.xml \
$(NULL)
stable_protocols = \
diff --git a/unstable/primary-selection/README b/unstable/primary-selection/README
new file mode 100644
index 0000000..6d8c0c6
--- /dev/null
+++ b/unstable/primary-selection/README
@@ -0,0 +1,4 @@
+Primary selection protocol
+
+Maintainers:
+Lyude <cpaul at redhat.com>
diff --git a/unstable/primary-selection/primary-selection-unstable-v1.xml b/unstable/primary-selection/primary-selection-unstable-v1.xml
new file mode 100644
index 0000000..a3618d5
--- /dev/null
+++ b/unstable/primary-selection/primary-selection-unstable-v1.xml
@@ -0,0 +1,229 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="primary_selection_unstable_v1">
+ <copyright>
+ Copyright © 2015 Red Hat
+
+ 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="Primary selection protocol">
+ This protocol provides the ability to have a primary selection device to
+ match that of the X server. This primary selection is a shortcut to the
+ common clipboard selection, where text just needs to be selected in order
+ to allow copying it elsewhere. The de facto way to perform this action
+ is the middle mouse button, although it is not limited to this one.
+
+ Clients wishing to honor primary selection should create a primary
+ selection source and set it as the selection through
+ wp_primary_selection_device.set_selection whenever the text selection
+ changes. In order to minimize calls in pointer-driven text selection,
+ it should happen only once after the operation finished. Similarly,
+ a NULL source should be set when text is unselected.
+
+ wp_primary_selection_offer objects are first announced through the
+ wp_primary_selection_device.data_offer event. Immediately after this event,
+ the primary data offer will emit wp_primary_selection_offer.offer events
+ to let know of the mime types being offered.
+
+ When the primary selection changes, the client with the keyboard focus
+ will receive wp_primary_selection_device.selection events. Only the client
+ with the keyboard focus will receive such events with a non-NULL
+ wp_primary_selection_offer. Across keyboard focus changes, previously
+ focused clients will receive wp_primary_selection_device.events with a
+ NULL wp_primary_selection_offer.
+
+ In order to request the primary selection data, the client must pass
+ a recent serial pertaining to the press event that is triggering the
+ operation, if the compositor deems the serial valid and recent, the
+ wp_primary_selection_source.send event will happen in the other end
+ to let the transfer begin. The client owning the primary selection
+ should write the requested data, and close the file descriptor
+ immediately.
+
+ If the primary selection owner client disappeared during the transfer,
+ the client reading the data will receive a
+ wp_primary_selection_device.selection event with a NULL
+ wp_primary_selection_offer, the client should take this as a hint
+ to finish the reads related to the no longer existing offer.
+
+ The primary selection owner should be checking for errors during
+ writes, merely cancelling the ongoing transfer if any happened.
+ </description>
+
+ <interface name="zwp_primary_selection_device_manager_v1" version="1">
+ <description summary="X primary selection emulation">
+ The primary selection device manager is the base interface of primary
+ selection, it allows to create wp_primary_selection_source objects, as
+ well as retrieving the per-seat wp_primary_selection_device objects.
+ </description>
+
+ <request name="create_source">
+ <description summary="create a new primary selection source">
+ Create a new primary selection source.
+ </description>
+ <arg name="id" type="new_id" interface="zwp_primary_selection_source_v1"/>
+ </request>
+
+ <request name="get_device">
+ <description summary="primary selection device manager">
+ Singleton global object that manages the zwp_primary_selection_device_v1
+ objects for each wl_seat.
+ </description>
+ <arg name="id" type="new_id" interface="zwp_primary_selection_device_v1"/>
+ <arg name="seat" type="object" interface="wl_seat"/>
+ </request>
+
+ <request name="destroy" type="destructor">
+ <description summary="destroy the primary selection device manager">
+ Destroy the primary selection device manager.
+ </description>
+ </request>
+ </interface>
+
+ <interface name="zwp_primary_selection_device_v1" version="1">
+ <request name="set_selection">
+ <description summary="set the primary selection">
+ Set the current contents of the primary selection buffer. This clears
+ anything which was previously held in the primary selection buffer.
+ </description>
+ <arg name="source" type="object" interface="zwp_primary_selection_source_v1" allow-null="true"/>
+ </request>
+
+ <event name="data_offer">
+ <description summary="introduce a new wp_primary_selection_offer">
+ Introduces a new wp_primary_selection_offer object that may be used
+ to receive the current primary selection. Immediately following this
+ event, the new wp_primary_selection_offer object will send
+ wp_primary_selection_offer.offer events to describe the offered mime
+ types.
+ </description>
+ <arg name="offer" type="new_id" interface="zwp_primary_selection_offer_v1"/>
+ </event>
+
+ <event name="selection">
+ <description summary="advertise a new primary selection">
+ The wp_primary_selection_device.selection event is sent to notify the
+ client of a new primary selection. This event is sent after the
+ wp_primary_selection.data_offer event introducing this object, and after
+ the offer has announced its mimetypes through
+ wp_primary_selection_offer.offer.
+
+ The data_offer is valid until a new offer or NULL is received
+ or until the client loses keyboard focus. The client must destroy the
+ previous selection data_offer, if any, upon receiving this event.
+ </description>
+ <arg name="id" type="object" interface="zwp_primary_selection_offer_v1" allow-null="true"/>
+ </event>
+
+ <request name="destroy" type="destructor">
+ <description summary="destroy the primary selection device">
+ Destroy the primary selection device.
+ </description>
+ </request>
+ </interface>
+
+ <interface name="zwp_primary_selection_offer_v1" version="1">
+ <description summary="offer to transfer primary selection contents">
+ A wp_primary_selection_offer represents an offer to transfer the contents
+ of the primary selection clipboard to the client. Similar to
+ wl_data_offer, the offer also describes the different mime types that the
+ data can be converted to and provides the mechanisms for transferring the
+ data directly to the client.
+ </description>
+
+ <request name="receive">
+ <description summary="request that the data is transferred">
+ To transfer the contents of the primary selection clipboard, the client
+ issues this request and indicates the mime type that it wants to
+ receive. The transfer happens through the passed file descriptor
+ (typically created with the pipe system call). The source client writes
+ the data in the mime type representation requested and then closes the
+ file descriptor.
+
+ The receiving client reads from the read end of the pipe until EOF and
+ closes its end, at which point the transfer is complete.
+
+ The given serial may be used by the compositor in order to determine
+ whether the receive request will be honored or not. Clients should
+ provide the button or key serial that is triggering the primary
+ selection request. Compositors should ignore requests with serials
+ that don't match any recent events, the file descriptor
+ should be closed immediately in this case.
+ </description>
+ <arg name="mime_type" type="string"/>
+ <arg name="fd" type="fd"/>
+ <arg name="serial" type="uint" summary="serial of the press event"/>
+ </request>
+
+ <request name="destroy" type="destructor">
+ <description summary="destroy the primary selection offer">
+ Destroy the primary selection offer.
+ </description>
+ </request>
+
+ <event name="offer">
+ <description summary="advertise offered mime type">
+ Sent immediately after creating announcing the wp_primary_selection_offer
+ through wp_primary_selection_device.data_offer. One event is sent per
+ offered mime type.
+ </description>
+ <arg name="mime_type" type="string"/>
+ </event>
+ </interface>
+
+ <interface name="zwp_primary_selection_source_v1" version="1">
+ <description summary="offer to replace the contents of the primary selection">
+ The source side of a wp_primary_selection_offer, it provides a way to
+ describe the offered data and respond to requests to transfer the
+ requested contents of the primary selection clipboard.
+ </description>
+
+ <request name="offer">
+ <description summary="add an offered mime type">
+ This request adds a mime type to the set of mime types advertised to
+ targets. Can be called several times to offer multiple types.
+ </description>
+ <arg name="mime_type" type="string"/>
+ </request>
+
+ <request name="destroy" type="destructor">
+ <description summary="destroy the primary selection source">
+ Destroy the primary selection source.
+ </description>
+ </request>
+
+ <event name="send">
+ <description summary="send the primary selection contents">
+ Request for the current primary selection contents from the client.
+ Send the specified mime type over the passed file descriptor, then
+ close it.
+ </description>
+ <arg name="mime_type" type="string"/>
+ <arg name="fd" type="fd"/>
+ </event>
+
+ <event name="cancelled">
+ <description summary="request for primary selection contents was canceled">
+ This primary selection source is no longer valid. The client should
+ clean up and destroy this primary selection source.
+ </description>
+ </event>
+ </interface>
+</protocol>
--
2.5.0
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