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 <?xml version="1.0" encoding="UTF-8"?>
 <protocol name="xdg_toplevel_drag_v1">
 
   <copyright>
     Copyright 2023 David Redondo
 
     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>
 
   <interface name="xdg_toplevel_drag_manager_v1" version="1">
     <description summary="Move a window during a drag">
       This protocol enhances normal drag and drop with the ability to move a
       window at the same time. This allows having detachable parts of a window
       that when dragged out of it become a new window and can be dragged over
       an existing window to be reattached.
 
       A typical workflow would be when the user starts dragging on top of a
       detachable part of a window, the client would create a wl_data_source and
       a xdg_toplevel_drag_v1 object and start the drag as normal via
       wl_data_device.start_drag. Once the client determines that the detachable
       window contents should be detached from the originating window, it creates
       a new xdg_toplevel with these contents and issues a
       xdg_toplevel_drag_v1.attach request before mapping it. From now on the new
       window is moved by the compositor during the drag as if the client called
       xdg_toplevel.move.
 
       Dragging an existing window is similar. The client creates a
       xdg_toplevel_drag_v1 object and attaches the existing toplevel before
       starting the drag.
 
       Clients use the existing drag and drop mechanism to detect when a window
       can be docked or undocked. If the client wants to snap a window into a
       parent window it should delete or unmap the dragged top-level. If the
       contents should be detached again it attaches a new toplevel as described
       above. If a drag operation is cancelled without being dropped, clients
       should revert to the previous state, deleting any newly created windows
       as appropriate. When a drag operation ends as indicated by
       wl_data_source.dnd_drop_performed the dragged toplevel window's final
       position is determined as if a xdg_toplevel_move operation ended.
 
       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>
 
     <enum name="error">
       <entry name="invalid_source" value="0"
              summary="data_source already used for toplevel drag"/>
     </enum>
 
     <request name="destroy" type="destructor">
       <description summary="destroy the xdg_toplevel_drag_manager_v1 object">
         Destroy this xdg_toplevel_drag_manager_v1 object. Other objects,
         including xdg_toplevel_drag_v1 objects created by this factory, are not
         affected by this request.
       </description>
     </request>
 
     <request name="get_xdg_toplevel_drag">
       <description summary="get an xdg_toplevel_drag for a wl_data_source">
         Create an xdg_toplevel_drag for a drag and drop operation that is going
         to be started with data_source.
 
         This request can only be made on sources used in drag-and-drop, so it
         must be performed before wl_data_device.start_drag. Attempting to use
         the source other than for drag-and-drop such as in
         wl_data_device.set_selection will raise an invalid_source error.
 
         Destroying data_source while a toplevel is attached to the
         xdg_toplevel_drag is undefined.
       </description>
 
       <arg name="id" type="new_id" interface="xdg_toplevel_drag_v1"/>
       <arg name="data_source" type="object" interface="wl_data_source"/>
     </request>
   </interface>
 
   <interface name="xdg_toplevel_drag_v1" version="1">
     <description summary="Object representing a toplevel move during a drag">
     </description>
 
     <enum name="error">
       <entry name="toplevel_attached" value="0"
              summary="valid toplevel already attached"/>
       <entry name="ongoing_drag" value="1"
              summary="drag has not ended" />
     </enum>
 
     <request name="destroy" type="destructor">
       <description summary="destroy an xdg_toplevel_drag_v1 object">
         Destroy this xdg_toplevel_drag_v1 object. This request must only be
         called after the underlying wl_data_source drag has ended, as indicated
         by the dnd_drop_performed or cancelled events. In any other case an
         ongoing_drag error is raised.
       </description>
     </request>
 
     <request name="attach">
       <description summary="Move a toplevel with the drag operation">
         Request that the window will be moved with the cursor during the drag
         operation. The offset is a hint to the compositor how the toplevel
         should be positioned relative to the cursor hotspot in surface local
         coordinates. For example it might only be used when an unmapped window
         is attached. The attached window does not participate in the selection
         of the drag target.
 
         If the toplevel is unmapped while it is attached, it is automatically
         detached from the drag. In this case this request has to be called again
         if the window should be attached after it is remapped.
 
         This request can be called multiple times but issuing it while a
         toplevel with an active role is attached raises a toplevel_attached
         error.
       </description>
 
       <arg name="toplevel" type="object" interface="xdg_toplevel"/>
       <arg name="x_offset" type="int" summary="dragged surface x offset"/>
       <arg name="y_offset" type="int" summary="dragged surface y offset"/>
     </request>
 
   </interface>
 </protocol>