Add pointer input

main.c

@@ -1,3 +1,4 @@
+#include <linux/input-event-codes.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -16,10 +17,16 @@ static const int height = 128;
 static bool running = true;
 
 static struct wl_shm *shm = NULL;
+static struct wl_seat *seat = NULL;
 static struct wl_compositor *compositor = NULL;
 static struct xdg_wm_base *xdg_wm_base = NULL;
 
 static void *shm_data = NULL;
+static struct xdg_toplevel *xdg_toplevel = NULL;
+
+static void noop() {
+	// This space intentionally left blank
+}
 
 static void xdg_surface_handle_configure(void *data,
 		struct xdg_surface *xdg_surface, uint32_t serial) {
@@ -30,26 +37,53 @@ static const struct xdg_surface_listener xdg_surface_listener = {
 	.configure = xdg_surface_handle_configure,
 };
 
-static void xdg_toplevel_handle_configure(void *data,
-		struct xdg_toplevel *xdg_toplevel, int32_t w, int32_t h,
-		struct wl_array *states) {
-	// This space intentionally left blank
-}
-
 static void xdg_toplevel_handle_close(void *data,
 		struct xdg_toplevel *xdg_toplevel) {
 	running = false;
 }
 
 static const struct xdg_toplevel_listener xdg_toplevel_listener = {
-	.configure = xdg_toplevel_handle_configure,
+	.configure = noop,
 	.close = xdg_toplevel_handle_close,
 };
 
+static void pointer_handle_button(void *data, struct wl_pointer *pointer,
+		uint32_t serial, uint32_t time, uint32_t button, uint32_t state) {
+	struct wl_seat *seat = data;
+
+	if (button == BTN_LEFT && state == WL_POINTER_BUTTON_STATE_PRESSED) {
+		xdg_toplevel_move(xdg_toplevel, seat, serial);
+	}
+}
+
+static const struct wl_pointer_listener pointer_listener = {
+	.enter = noop,
+	.leave = noop,
+	.motion = noop,
+	.button = pointer_handle_button,
+	.axis = noop,
+};
+
+static void seat_handle_capabilities(void *data, struct wl_seat *seat,
+		uint32_t capabilities) {
+	if (capabilities & WL_SEAT_CAPABILITY_POINTER) {
+		struct wl_pointer *pointer = wl_seat_get_pointer(seat);
+		wl_pointer_add_listener(pointer, &pointer_listener, seat);
+	}
+}
+
+static const struct wl_seat_listener seat_listener = {
+	.capabilities = seat_handle_capabilities,
+};
+
 static void handle_global(void *data, struct wl_registry *registry,
 		uint32_t name, const char *interface, uint32_t version) {
 	if (strcmp(interface, wl_shm_interface.name) == 0) {
 		shm = wl_registry_bind(registry, name, &wl_shm_interface, 1);
+	} else if (strcmp(interface, wl_seat_interface.name) == 0) {
+		struct wl_seat *seat =
+			wl_registry_bind(registry, name, &wl_seat_interface, 1);
+		wl_seat_add_listener(seat, &seat_listener, NULL);
 	} else if (strcmp(interface, wl_compositor_interface.name) == 0) {
 		compositor = wl_registry_bind(registry, name,
 			&wl_compositor_interface, 1);
@@ -119,7 +153,7 @@ int main(int argc, char *argv[]) {
 	struct wl_surface *surface = wl_compositor_create_surface(compositor);
 	struct xdg_surface *xdg_surface =
 		xdg_wm_base_get_xdg_surface(xdg_wm_base, surface);
-	struct xdg_toplevel *xdg_toplevel = xdg_surface_get_toplevel(xdg_surface);
+	xdg_toplevel = xdg_surface_get_toplevel(xdg_surface);
 
 	xdg_surface_add_listener(xdg_surface, &xdg_surface_listener, NULL);
 	xdg_toplevel_add_listener(xdg_toplevel, &xdg_toplevel_listener, NULL);