[PATCH wayland-protocols] unstable: add xdg-primary-selection protocol

Simon Ser contact at emersion.fr
Sun Jul 15 18:36:10 UTC 2018


Hi Jonas,

What do you think of this proposal? (It's basically the GTK protocol with some prefix changes)

Thanks,

Simon

On July 8, 2018 8:14 PM, Simon Ser <contact at emersion.fr> wrote:
> This primary selection is similar in spirit to the eponymous
> in X11, allowing a quick "select text + middle click" shortcut
> to copying and pasting.
>
> It's otherwise very similar to its Wayland counterpart, and
> explicitly made consistent with it.
>
> Signed-off-by: Simon Ser <contact at emersion.fr>
> ---
> This is a continuation of [1]. This protocol was pretty close to being accepted.
>
> I've chosen to put the xdg prefix because this primary selection is mostly relevant
> to desktop compositors.
>
> I've added myself as maintainer, Carlos and Lyude let me know if you want to replace
> me or be added to the list too.
>
> [1]: https://lists.freedesktop.org/archives/wayland-devel/2016-February/027101.html
>
>  Makefile.am                                   |   3 +-
>  unstable/xdg-primary-selection/README         |   4 +
>  .../xdg-primary-selection-unstable-v1.xml     | 225 ++++++++++++++++++
>  3 files changed, 231 insertions(+), 1 deletion(-)
>  create mode 100644 unstable/xdg-primary-selection/README
>  create mode 100644 unstable/xdg-primary-selection/xdg-primary-selection-unstable-v1.xml
>
> diff --git a/Makefile.am b/Makefile.am
> index 2b59d34..66a65af 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -19,7 +19,8 @@ unstable_protocols =								\
>  	unstable/keyboard-shortcuts-inhibit/keyboard-shortcuts-inhibit-unstable-v1.xml \
>  	unstable/xdg-output/xdg-output-unstable-v1.xml				\
>  	unstable/input-timestamps/input-timestamps-unstable-v1.xml	\
> -	unstable/xdg-decoration/xdg-decoration-unstable-v1.xml	\
> +  unstable/xdg-decoration/xdg-decoration-unstable-v1.xml	\
> +	unstable/xdg-primary-selection/xdg-primary-selection-unstable-v1.xml	\
>  	$(NULL)
>
>  stable_protocols =								\
> diff --git a/unstable/xdg-primary-selection/README b/unstable/xdg-primary-selection/README
> new file mode 100644
> index 0000000..ae0a402
> --- /dev/null
> +++ b/unstable/xdg-primary-selection/README
> @@ -0,0 +1,4 @@
> +Primary selection protocol
> +
> +Maintainers:
> +Simon Ser <contact at emersion.fr>
> diff --git a/unstable/xdg-primary-selection/xdg-primary-selection-unstable-v1.xml b/unstable/xdg-primary-selection/xdg-primary-selection-unstable-v1.xml
> new file mode 100644
> index 0000000..eb97425
> --- /dev/null
> +++ b/unstable/xdg-primary-selection/xdg-primary-selection-unstable-v1.xml
> @@ -0,0 +1,225 @@
> +<?xml version="1.0" encoding="UTF-8"?>
> +<protocol name="xdg_primary_selection_unstable_v1">
> +  <copyright>
> +    Copyright © 2015, 2016 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
> +    xdg_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.
> +
> +    xdg_primary_selection_offer objects are first announced through the
> +    xdg_primary_selection_device.data_offer event. Immediately after this event,
> +    the primary data offer will emit xdg_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 xdg_primary_selection_device.selection events. Only the client
> +    with the keyboard focus will receive such events with a non-NULL
> +    xdg_primary_selection_offer. Across keyboard focus changes, previously
> +    focused clients will receive xdg_primary_selection_device.events with a
> +    NULL xdg_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
> +    xdg_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
> +    xdg_primary_selection_device.selection event with a NULL
> +    xdg_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="zxdg_primary_selection_device_manager_v1" version="1">
> +    <description summary="X primary selection emulation">
> +      The primary selection device manager is a singleton global object that
> +      provides access to the primary selection. It allows to create
> +      xdg_primary_selection_source objects, as well as retrieving the per-seat
> +      xdg_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="zxdg_primary_selection_source_v1"/>
> +    </request>
> +
> +    <request name="get_device">
> +      <description summary="create a new primary selection device">
> +        Create a new data device for a given seat.
> +      </description>
> +      <arg name="id" type="new_id" interface="zxdg_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="zxdg_primary_selection_device_v1" version="1">
> +    <request name="set_selection">
> +      <description summary="set the primary selection">
> +        Replaces the current selection. The previous owner of the primary selection
> +        will receive a xdg_primary_selection_source.cancelled event.
> +
> +        To unset the selection, set the source to NULL.
> +      </description>
> +      <arg name="source" type="object" interface="zxdg_primary_selection_source_v1" allow-null="true"/>
> +      <arg name="serial" type="uint" summary="serial of the event that triggered this request"/>
> +    </request>
> +
> +    <event name="data_offer">
> +      <description summary="introduce a new xdg_primary_selection_offer">
> +        Introduces a new xdg_primary_selection_offer object that may be used
> +        to receive the current primary selection. Immediately following this
> +        event, the new xdg_primary_selection_offer object will send
> +        xdg_primary_selection_offer.offer events to describe the offered mime
> +        types.
> +      </description>
> +      <arg name="offer" type="new_id" interface="zxdg_primary_selection_offer_v1"/>
> +    </event>
> +
> +    <event name="selection">
> +      <description summary="advertise a new primary selection">
> +        The xdg_primary_selection_device.selection event is sent to notify the
> +        client of a new primary selection. This event is sent after the
> +        xdg_primary_selection.data_offer event introducing this object, and after
> +        the offer has announced its mimetypes through
> +        xdg_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="zxdg_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="zxdg_primary_selection_offer_v1" version="1">
> +    <description summary="offer to transfer primary selection contents">
> +      A xdg_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 mime types that the source
> +      will transferthat 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.
> +      </description>
> +      <arg name="mime_type" type="string"/>
> +      <arg name="fd" type="fd"/>
> +    </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 xdg_primary_selection_offer
> +        through xdg_primary_selection_device.data_offer. One event is sent per
> +        offered mime type.
> +      </description>
> +      <arg name="mime_type" type="string"/>
> +    </event>
> +  </interface>
> +
> +  <interface name="zxdg_primary_selection_source_v1" version="1">
> +    <description summary="offer to replace the contents of the primary selection">
> +      The source side of a xdg_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>
> --
> 2.18.0
>
>
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