input: Add support for keyboard shortcuts inhibit

Adding support for the keyboard shortcuts inhibit protocol allows remote
desktop and virtualisation software to receive all keyboard input in
order to pass it through to their clients so users can fully interact
the their remote/virtual session. The software usually provides its own
key combination to release its "grab" to all keyboard input. The
inhibitor can be deactivated by the user by removing focus from the
surface using another input device such as the pointer.

Use support for the procotol in wlroots to add support to sway. Extend
the input manager with handlers for inhibitor creation and destruction
and appropriate bookkeeping. Attach the inhibitors to the seats they
apply to to avoid having to search the list of all currently existing
inhibitors on every keystroke and passing the inhibitor manager around.
Add a helper function to retrieve the inhibitor applying to the
currently focused surface of a seat, if one exists.

Extend bindsym with a flag for bindings that should be processed even if
an inhibitor is active. Conversely this disables all normal shortcuts if
an inhibitor is found for the currently focused surface in
keyboard::handle_key_event() since they don't have that flag set. Use
above helper function to determine if an inhibitor exists for the
surface that would eventually receive input.

Signed-off-by: Michael Weiser <michael.weiser@gmx.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/sway/config.h b/include/sway/config.h
index 5f02e44f..fdd65efd 100644
--- a/include/sway/config.h
+++ b/include/sway/config.h
@@ -40,6 +40,7 @@ enum binding_flags {
         BINDING_TITLEBAR=16, // mouse only; trigger on container titlebar
         BINDING_CODE=32,     // keyboard only; convert keysyms into keycodes
         BINDING_RELOAD=64,   // switch only; (re)trigger binding on reload
+        BINDING_INHIBITED=128,  // keyboard only: ignore shortcut inhibitor
 };
 
 /**