xwm: user custom event handler

include/wlr/xwayland.h

@@ -32,6 +32,13 @@ struct wlr_xwayland {
 		struct wl_signal new_surface;
 	} events;
 
+	/**
+	 * Add a custom event handler to xwayland. Return 1 if the event was
+	 * handled or 0 to use the default wlr-xwayland handler. wlr-xwayland will
+	 * free the event.
+	 */
+	int (*user_event_handler)(struct wlr_xwm *xwm, xcb_generic_event_t *event);
+
 	void *data;
 };
 

meson.build

@@ -87,7 +87,7 @@ if get_option('enable_xwayland')
 	wlr_parts += [lib_wlr_xwayland]
 	conf_data.set('WLR_HAS_XWAYLAND', true)
 else
-	exclude_files += ['xwayland.h']
+	exclude_files += ['xwayland.h', 'xwm.h']
 endif
 configure_file(output: 'config.h', install_dir: 'include/wlr', configuration: conf_data)
 install_subdir('include/wlr', install_dir: 'include', exclude_files: exclude_files)

xwayland/xwayland.c

@@ -19,7 +19,7 @@
 #include "wlr/util/log.h"
 #include "wlr/xwayland.h"
 #include "sockets.h"
-#include "xwm.h"
+#include "wlr/xwm.h"
 
 #ifdef __FreeBSD__
 static inline int clearenv(void) {

xwayland/xwm.c

@@ -12,7 +12,7 @@
 #include "wlr/types/wlr_surface.h"
 #include "wlr/xwayland.h"
 #include "wlr/xcursor.h"
-#include "xwm.h"
+#include "wlr/xwm.h"
 
 #ifdef HAS_XCB_ICCCM
 	#include <xcb/xcb_icccm.h>
@@ -938,6 +938,12 @@ static int x11_event_handler(int fd, uint32_t mask, void *data) {
 
 	while ((event = xcb_poll_for_event(xwm->xcb_conn))) {
 		count++;
+
+		if (xwm->xwayland->user_event_handler &&
+				xwm->xwayland->user_event_handler(xwm, event)) {
+			break;
+		}
+
 		switch (event->response_type & XCB_EVENT_RESPONSE_TYPE_MASK) {
 		case XCB_CREATE_NOTIFY:
 			xwm_handle_create_notify(xwm, (xcb_create_notify_event_t *)event);