wlroots/protocol/foreign-toplevel-info-unstable-v1.xml

<?xml version="1.0" encoding="UTF-8"?>
<protocol name="foreign_toplevel_info_unstable_v1">
  <copyright>
    Copyright © 2018 Ilia Bozhinov
    Copyright © 2020 Isaac Freund

    Permission to use, copy, modify, distribute, and sell this
    software and its documentation for any purpose is hereby granted
    without fee, provided that the above copyright notice appear in
    all copies and that both that copyright notice and this permission
    notice appear in supporting documentation, and that the name of
    the copyright holders not be used in advertising or publicity
    pertaining to distribution of the software without specific,
    written prior permission.  The copyright holders make no
    representations about the suitability of this software for any
    purpose.  It is provided "as is" without express or implied
    warranty.

    THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
    SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
    FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
    SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
    AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
    ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
    THIS SOFTWARE.
  </copyright>

  <interface name="zext_foreign_toplevel_info_v1" version="1">
    <description summary="list toplevels and properties thereof">
      The purpose of this protocol is to enable clients such as taskbars
      or docks to access a list of opened applications and basic properties
      thereof.

      The secondary purpose of this protocol is to provide protocol object
      handles for toplevels which may be used to address said toplevels in
      other protocols (e.g. to target a toplevel for screencopy).

      After a client binds the zext_foreign_toplevel_info_v1, each opened
      toplevel window will be sent via the toplevel event
    </description>

    <event name="toplevel">
      <description summary="a toplevel has been created">
        This event is emitted whenever a new toplevel window is created. It is
        emitted for all toplevels, regardless of the app that has created them.

        All initial properties of the toplevel (title, app_id, states, etc.)
        will be sent immediately after this event via the corresponding
        events in zext_foreign_toplevel_handle_v1.
      </description>
      <arg name="toplevel" type="new_id" interface="zext_foreign_toplevel_handle_v1"/>
    </event>

    <request name="stop">
      <description summary="stop sending events">
        This request indicates that the client no longer wishes to receive
        events for new toplevels.  However, the compositor may emit further
        toplevel_created events until the finished event is emitted.

        The client must not send any more requests after this one.
      </description>
    </request>

    <event name="finished">
      <description summary="the compositor has finished with the toplevel manager">
        This event indicates that the compositor is done sending events
        to the zext_foreign_toplevel_info_v1. The server will destroy the
        object immediately after sending this request, so it will become
        invalid and the client should free any resources associated with it.
      </description>
    </event>
  </interface>

  <interface name="zext_foreign_toplevel_handle_v1" version="1">
    <description summary="an open toplevel">
      A zext_foreign_toplevel_handle_v1 object represents an open toplevel
      window.  A single app may have multiple open toplevels.

      Each toplevel has a list of outputs it is visible on, exposed to the
      client via the output_enter and output_leave events.
    </description>

    <request name="destroy" type="destructor">
      <description summary="destroy the zext_foreign_toplevel_handle_v1 object">
        This request should be called either when the client will no longer
        use the zext_foreign_toplevel_handle_v1 or after the closed event
        has been received to allow destruction of the object.
      </description>
    </request>

    <event name="closed">
      <description summary="the toplevel has been closed">
        The server will emit no further events on the
        zext_foreign_toplevel_handle_v1 after this event. Any requests received
        aside from the destroy request will be ignored. Upon receiving this
        event, the client should make the destroy request to allow freeing
        of resources.
      </description>
    </event>

    <event name="done">
      <description summary="all information about the toplevel has been sent">
        This event is sent after all changes in the toplevel state have
        been sent.

        This allows changes to the zext_foreign_toplevel_handle_v1 properties
        to be seen as atomic, even if they happen via multiple events.

        Note: this is is not sent after the closed event.
      </description>
    </event>

    <event name="title">
      <description summary="title change">
        This event is emitted whenever the title of the toplevel changes.
      </description>
      <arg name="title" type="string"/>
    </event>

    <event name="app_id">
      <description summary="app_id change">
        This event is emitted whenever the app_id of the toplevel changes.
      </description>
      <arg name="app_id" type="string"/>
    </event>

    <event name="output_enter">
      <description summary="toplevel entered an output">
        This event is emitted whenever the toplevel becomes visible on the
        given output. A toplevel may be visible on multiple outputs.
      </description>
      <arg name="output" type="object" interface="wl_output"/>
    </event>

    <event name="output_leave">
      <description summary="toplevel left an output">
        This event is emitted whenever the toplevel is no longer visible
        on a given output. It is guaranteed that an output_enter event with
        the same output has been emitted before this event.
      </description>
      <arg name="output" type="object" interface="wl_output"/>
    </event>

    <enum name="state">
      <description summary="types of states on the toplevel">
        The different states that a toplevel may have. These have the same
        meaning as the states with the same names defined in xdg-toplevel
      </description>
      <entry name="maximized"  value="0" summary="the toplevel is maximized"/>
      <entry name="minimized"  value="1" summary="the toplevel is minimized"/>
      <entry name="activated"  value="2" summary="the toplevel is active"/>
      <entry name="fullscreen" value="3" summary="the toplevel is fullscreen"/>
    </enum>

    <event name="state">
      <description summary="the toplevel state changed">
        This event is emitted once on creation of the
        zext_foreign_toplevel_handle_v1 and again whenever the state of the
        toplevel changes.
      </description>
      <arg name="state" type="array"/>
    </event>

    <event name="parent">
      <description summary="parent change">
        This event is emitted whenever the parent of the toplevel changes.

        No event is emitted when the parent handle is destroyed by the client.
      </description>
      <arg name="parent" type="object" interface="zext_foreign_toplevel_handle_v1" allow-null="true"/>
    </event>
  </interface>
</protocol>