xdg-activation-v1.xml 8.78 KB
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<?xml version="1.0" encoding="UTF-8"?>
<protocol name="xdg_activation_v1">

  <copyright>
    Copyright © 2020 Aleix Pol Gonzalez &lt;aleixpol@kde.org&gt;
    Copyright © 2020 Carlos Garnacho &lt;carlosg@gnome.org&gt;

    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 requesting activation of surfaces">
    The way for a client to pass focus to another toplevel is as follows.

    The client that intends to activate another toplevel uses the
    xdg_activation_v1.get_activation_token request to get an activation token.
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    This token is then forwarded to the client, which is supposed to activate
    one of its surfaces, through a separate band of communication.

    One established way of doing this is through the XDG_ACTIVATION_TOKEN
    environment variable of a newly launched child process. The child process
    should unset the environment variable again right after reading it out in
    order to avoid propagating it to other child processes.

    Another established way exists for Applications implementing the D-Bus
    interface org.freedesktop.Application, which should get their token under
    XDG_ACTIVATION_TOKEN on their platform_data.

    In general activation tokens may be transferred across clients through
    means not described in this protocol.

    The client to be activated will then pass the token
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    it received to the xdg_activation_v1.activate request. The compositor can
    then use this token to decide how to react to the activation request.

    The token the activating client gets may be ineffective either already at
    the time it receives it, for example if it was not focused, for focus
    stealing prevention. The activating client will have no way to discover
    the validity of the token, and may still forward it to the to be activated
    client.

    The created activation token may optionally get information attached to it
    that can be used by the compositor to identify the application that we
    intend to activate. This can for example be used to display a visual hint
    about what application is being started.

    Warning! The protocol described in this file is currently in the testing
    phase. Backward compatible changes may be added together with the
    corresponding interface version bump. Backward incompatible changes can
    only be done by creating a new major version of the extension.
  </description>

  <interface name="xdg_activation_v1" version="1">
    <description summary="interface for activating surfaces">
      A global interface used for informing the compositor about applications
      being activated or started, or for applications to request to be
      activated.
    </description>

    <request name="destroy" type="destructor">
      <description summary="destroy the xdg_activation object">
        Notify the compositor that the xdg_activation object will no longer be
        used.

        The child objects created via this interface are unaffected and should
        be destroyed separately.
      </description>
    </request>

    <request name="get_activation_token">
      <description summary="requests a token">
        Creates an xdg_activation_token_v1 object that will provide
        the initiating client with a unique token for this activation. This
        token should be offered to the clients to be activated.
      </description>

      <arg name="id" type="new_id" interface="xdg_activation_token_v1"/>
    </request>

    <request name="activate">
      <description summary="notify new interaction being available">
        Requests surface activation. It's up to the compositor to display
        this information as desired, for example by placing the surface above
        the rest.

        The compositor may know who requested this by checking the activation
        token and might decide not to follow through with the activation if it's
        considered unwanted.

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        Compositors can ignore unknown activation tokens when an invalid
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        token is passed.
      </description>
      <arg name="token" type="string" summary="the activation token of the initiating client"/>
      <arg name="surface" type="object" interface="wl_surface"
	   summary="the wl_surface to activate"/>
    </request>
  </interface>

  <interface name="xdg_activation_token_v1" version="1">
    <description summary="an exported activation handle">
      An object for setting up a token and receiving a token handle that can
      be passed as an activation token to another client.

      The object is created using the xdg_activation_v1.get_activation_token
      request. This object should then be populated with the app_id, surface
      and serial information and committed. The compositor shall then issue a
      done event with the token. In case the request's parameters are invalid,
      the compositor will provide an invalid token.
    </description>

    <enum name="error">
      <entry name="already_used" value="0"
             summary="The token has already been used previously"/>
    </enum>

    <request name="set_serial">
      <description summary="specifies the seat and serial of the activating event">
        Provides information about the seat and serial event that requested the
        token.

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        The serial can come from an input or focus event. For instance, if a
        click triggers the launch of a third-party client, the launcher client
        should send a set_serial request with the serial and seat from the
        wl_pointer.button event.

        Some compositors might refuse to activate toplevels when the token
        doesn't have a valid and recent enough event serial.

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        Must be sent before commit. This information is optional.
      </description>
      <arg name="serial" type="uint"
           summary="the serial of the event that triggered the activation"/>
      <arg name="seat" type="object" interface="wl_seat"
           summary="the wl_seat of the event"/>
    </request>

    <request name="set_app_id">
      <description summary="specifies the application being activated">
        The requesting client can specify an app_id to associate the token
        being created with it.

        Must be sent before commit. This information is optional.
      </description>
      <arg name="app_id" type="string"
           summary="the application id of the client being activated."/>
    </request>

    <request name="set_surface">
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      <description summary="specifies the surface requesting activation">
        This request sets the surface requesting the activation. Note, this is
        different from the surface that will be activated.

        Some compositors might refuse to activate toplevels when the token
        doesn't have a requesting surface.
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        Must be sent before commit. This information is optional.
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      </description>
      <arg name="surface" type="object" interface="wl_surface"
	   summary="the requesting surface"/>
    </request>

    <request name="commit">
      <description summary="issues the token request">
        Requests an activation token based on the different parameters that
        have been offered through set_serial, set_surface and set_app_id.
      </description>
    </request>

    <event name="done">
      <description summary="the exported activation token">
        The 'done' event contains the unique token of this activation request
        and notifies that the provider is done.
      </description>
      <arg name="token" type="string" summary="the exported activation token"/>
    </event>

    <request name="destroy" type="destructor">
      <description summary="destroy the xdg_activation_token_v1 object">
        Notify the compositor that the xdg_activation_token_v1 object will no
        longer be used.
      </description>
    </request>
  </interface>
</protocol>