Add keyboard shortcuts inhibitor

This adds a new protocol to let Wayland clients specify that they want
all keyboard events to be sent to the client, regardless of the
compositor own shortcuts.

This protocol can be used for virtual machine and remote connection
viewers which require to pass all keyboard shortcuts to the hosted or
remote system instead of being caught up by the compositor locally.

Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Jonas Ådahl <jadahl@gmail.com>

2 files changed, 147 insertions, 0 deletions

diff --git a/unstable/keyboard-shortcuts-inhibit/README b/unstable/keyboard-shortcuts-inhibit/README
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+++ b/unstable/keyboard-shortcuts-inhibit/README
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+Compositor shortcuts inhibit protocol
+
+Maintainers:
+Olivier Fourdan <ofourdan@redhat.com>
diff --git a/unstable/keyboard-shortcuts-inhibit/keyboard-shortcuts-inhibit-unstable-v1.xml b/unstable/keyboard-shortcuts-inhibit/keyboard-shortcuts-inhibit-unstable-v1.xml
new file mode 100644
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+++ b/unstable/keyboard-shortcuts-inhibit/keyboard-shortcuts-inhibit-unstable-v1.xml
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+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="keyboard_shortcuts_inhibit_unstable_v1">
+
+  <copyright>
+    Copyright © 2017 Red Hat Inc.
+
+    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 inhibiting the compositor keyboard shortcuts">
+    This protocol specifies a way for a client to request the compositor
+    to ignore its own keyboard shortcuts for a given seat, so that all
+    key events from that seat get forwarded to a surface.
+
+    Warning! The protocol described in this file is experimental and
+    backward incompatible changes may be made. Backward compatible
+    changes may be added together with the corresponding interface
+    version bump.
+    Backward incompatible changes are done by bumping the version
+    number in the protocol and interface names and resetting the
+    interface version. Once the protocol is to be declared stable,
+    the 'z' prefix and the version number in the protocol and
+    interface names are removed and the interface version number is
+    reset.
+  </description>
+
+  <interface name="zwp_keyboard_shortcuts_inhibit_manager_v1" version="1">
+    <description summary="context object for keyboard grab_manager">
+      A global interface used for inhibiting the compositor keyboard shortcuts.
+    </description>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy the keyboard shortcuts inhibitor object">
+	Destroy the keyboard shortcuts inhibitor manager.
+      </description>
+    </request>
+
+    <request name="inhibit_shortcuts">
+      <description summary="create a new keyboard shortcuts inhibitor object">
+	Create a new keyboard shortcuts inhibitor object associated with
+	the given surface for the given seat.
+
+	If shortcuts are already inhibited for the specified seat and surface,
+	a protocol error "already_inhibited" is raised by the compositor.
+      </description>
+      <arg name="id" type="new_id" interface="zwp_keyboard_shortcuts_inhibitor_v1"/>
+      <arg name="surface" type="object" interface="wl_surface"
+	   summary="the surface that inhibits the keyboard shortcuts behavior"/>
+      <arg name="seat" type="object" interface="wl_seat"
+	   summary="the wl_seat for which keyboard shortcuts should be disabled"/>
+    </request>
+
+    <enum name="error">
+      <entry name="already_inhibited"
+	     value="0"
+	     summary="the shortcuts are already inhibited for this surface"/>
+    </enum>
+  </interface>
+
+  <interface name="zwp_keyboard_shortcuts_inhibitor_v1" version="1">
+    <description summary="context object for keyboard shortcuts inhibitor">
+      A keyboard shortcuts inhibitor instructs the compositor to ignore
+      its own keyboard shortcuts when the associated surface has keyboard
+      focus. As a result, when the surface has keyboard focus on the given
+      seat, it will receive all key events originating from the specified
+      seat, even those which would normally be caught by the compositor for
+      its own shortcuts.
+
+      The Wayland compositor is however under no obligation to disable
+      all of its shortcuts, and may keep some special key combo for its own
+      use, including but not limited to one allowing the user to forcibly
+      restore normal keyboard events routing in the case of an unwilling
+      client. The compositor may also use the same key combo to reactivate
+      an existing shortcut inhibitor that was previously deactivated on
+      user request.
+
+      When the compositor restores its own keyboard shortcuts, an
+      "inactive" event is emitted to notify the client that the keyboard
+      shortcuts inhibitor is not effectively active for the surface and
+      seat any more, and the client should not expect to receive all
+      keyboard events.
+
+      When the keyboard shortcuts inhibitor is inactive, the client has
+      no way to forcibly reactivate the keyboard shortcuts inhibitor.
+
+      The user can chose to re-enable a previously deactivated keyboard
+      shortcuts inhibitor using any mechanism the compositor may offer,
+      in which case the compositor will send an "active" event to notify
+      the client.
+
+      If the surface is destroyed, unmapped, or loses the seat's keyboard
+      focus, the keyboard shortcuts inhibitor becomes irrelevant and the
+      compositor will restore its own keyboard shortcuts but no "inactive"
+      event is emitted in this case.
+    </description>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy the keyboard shortcuts inhibitor object">
+	Remove the keyboard shortcuts inhibitor from the associated wl_surface.
+      </description>
+    </request>
+
+    <event name="active">
+      <description summary="shortcuts are inhibited">
+	This event indicates that the shortcut inhibitor is active.
+
+	The compositor sends this event every time compositor shortcuts
+	are inhibited on behalf of the surface. When active, the client
+	may receive input events normally reserved by the compositor
+	(see zwp_keyboard_shortcuts_inhibitor_v1).
+
+	This occurs typically when the initial request "inhibit_shortcuts"
+	first becomes active or when the user instructs the compositor to
+	re-enable and existing shortcuts inhibitor using any mechanism
+	offered by the compositor.
+      </description>
+    </event>
+
+    <event name="inactive">
+      <description summary="shortcuts are restored">
+	This event indicates that the shortcuts inhibitor is inactive,
+	normal shortcuts processing is restored by the compositor.
+       </description>
+    </event>
+  </interface>
+</protocol>