[PATCH wayland 3/6] wl_keyboard: Add modifier event

[Daniel Stone]

This event sends the current keyboard modifier/group state from the
compositor to the client, allowing all clients to have a consistent view
of the keyboard state (e.g. current layout, Caps Lock, et al).  It
should be sent after a keyboard enter event, and also immediately after
any key event which changes the modifier state.

Signed-off-by: Daniel Stone <daniel at fooishbar.org>
---
 protocol/wayland.xml |   13 +++++++++++++
 src/wayland-server.c |   19 ++++++++++++++++++-
 src/wayland-server.h |    3 +++
 3 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/protocol/wayland.xml b/protocol/wayland.xml
index 3979d97..eb09849 100644
--- a/protocol/wayland.xml
+++ b/protocol/wayland.xml
@@ -872,6 +872,19 @@
       <arg name="key" type="uint"/>
       <arg name="state" type="uint"/>
     </event>
+
+    <event name="modifiers">
+      <description summary="modifier and group state">
+        Notifies clients that the modifier and/or group state has
+	changed, and it should update its local state.
+      </description>
+
+      <arg name="serial" type="uint"/>
+      <arg name="mods_depressed" type="uint"/>
+      <arg name="mods_latched" type="uint"/>
+      <arg name="mods_locked" type="uint"/>
+      <arg name="group" type="uint"/>
+    </event>
   </interface>
 
   <interface name="wl_touch" version="1">
diff --git a/src/wayland-server.c b/src/wayland-server.c
index 2845671..aee4efc 100644
--- a/src/wayland-server.c
+++ b/src/wayland-server.c
@@ -532,9 +532,26 @@ default_grab_key(struct wl_keyboard_grab *grab,
 	}
 }
 
+static void
+default_grab_modifiers(struct wl_keyboard_grab *grab, uint32_t serial,
+		       uint32_t mods_depressed, uint32_t mods_latched,
+		       uint32_t mods_locked, uint32_t group)
+{
+	struct wl_keyboard *keyboard = grab->keyboard;
+	struct wl_resource *resource;
+
+	resource = keyboard->focus_resource;
+	if (!resource)
+		return;
+
+	wl_keyboard_send_modifiers(resource, serial, mods_depressed,
+				   mods_latched, mods_locked, group);
+}
+
 static const struct wl_keyboard_grab_interface
 				default_keyboard_grab_interface = {
-	default_grab_key
+	default_grab_key,
+	default_grab_modifiers,
 };
 
 WL_EXPORT void
diff --git a/src/wayland-server.h b/src/wayland-server.h
index 731be00..d905ea8 100644
--- a/src/wayland-server.h
+++ b/src/wayland-server.h
@@ -210,6 +210,9 @@ struct wl_keyboard_grab;
 struct wl_keyboard_grab_interface {
 	void (*key)(struct wl_keyboard_grab *grab, uint32_t time,
 		    uint32_t key, uint32_t state);
+	void (*modifiers)(struct wl_keyboard_grab *grab, uint32_t serial,
+			  uint32_t mods_depressed, uint32_t mods_latched,
+			  uint32_t mods_locked, uint32_t group);
 };
 
 struct wl_keyboard_grab {
-- 
1.7.10