[PATCH wayland] Maintain keyboard modifier state in wayland-server

[Daniel Stone]

Provide a slot for keyboard modifier state inside wl_keyboard for
implementations to update, and use this to send wl_keyboard:;modifier
events whenever the keyboard or pointer focus changes.

Signed-off-by: Daniel Stone <daniel at fooishbar.org>
---
 src/wayland-server.c |   20 +++++++++++++++++++-
 src/wayland-server.h |    7 +++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/src/wayland-server.c b/src/wayland-server.c
index 010d9ca..39b3b59 100644
--- a/src/wayland-server.c
+++ b/src/wayland-server.c
@@ -724,7 +724,8 @@ WL_EXPORT void
 wl_pointer_set_focus(struct wl_pointer *pointer, struct wl_surface *surface,
 		     wl_fixed_t sx, wl_fixed_t sy)
 {
-	struct wl_resource *resource;
+	struct wl_keyboard *kbd = pointer->seat->keyboard;
+	struct wl_resource *resource, *kr;
 	uint32_t serial;
 
 	resource = pointer->focus_resource;
@@ -741,6 +742,18 @@ wl_pointer_set_focus(struct wl_pointer *pointer, struct wl_surface *surface,
 	    (pointer->focus != surface ||
 	     pointer->focus_resource != resource)) {
 		serial = wl_display_next_serial(resource->client->display);
+		if (kbd) {
+			kr = find_resource_for_surface(&kbd->resource_list,
+						       surface);
+			if (kr) {
+				wl_keyboard_send_modifiers(resource,
+							   serial,
+							   kbd->modifiers.mods_depressed,
+							   kbd->modifiers.mods_latched,
+							   kbd->modifiers.mods_locked,
+							   kbd->modifiers.group);
+			}
+		}
 		wl_pointer_send_enter(resource, serial, &surface->resource,
 				      sx, sy);
 		wl_signal_add(&resource->destroy_signal,
@@ -774,6 +787,11 @@ wl_keyboard_set_focus(struct wl_keyboard *keyboard, struct wl_surface *surface)
 	    (keyboard->focus != surface ||
 	     keyboard->focus_resource != resource)) {
 		serial = wl_display_next_serial(resource->client->display);
+		wl_keyboard_send_modifiers(resource, serial,
+					   keyboard->modifiers.mods_depressed,
+					   keyboard->modifiers.mods_latched,
+					   keyboard->modifiers.mods_locked,
+					   keyboard->modifiers.group);
 		wl_keyboard_send_enter(resource, serial, &surface->resource,
 				       &keyboard->keys);
 		wl_signal_add(&resource->destroy_signal,
diff --git a/src/wayland-server.h b/src/wayland-server.h
index a7bc7b4..18a8beb 100644
--- a/src/wayland-server.h
+++ b/src/wayland-server.h
@@ -280,6 +280,13 @@ struct wl_keyboard {
 	uint32_t grab_time;
 
 	struct wl_array keys;
+
+	struct {
+		uint32_t mods_depressed;
+		uint32_t mods_latched;
+		uint32_t mods_locked;
+		uint32_t group;
+	} modifiers;
 };
 
 struct wl_touch {
-- 
1.7.10