Support pointer constraints protocol

Makefile

@@ -16,7 +16,7 @@ LDLIBS    = `$(PKG_CONFIG) --libs $(PKGS)` $(LIBS)
 all: dwl
 dwl: dwl.o util.o
 	$(CC) dwl.o util.o $(LDLIBS) $(LDFLAGS) $(DWLCFLAGS) -o $@
-dwl.o: dwl.c config.mk config.h client.h cursor-shape-v1-protocol.h xdg-shell-protocol.h wlr-layer-shell-unstable-v1-protocol.h
+dwl.o: dwl.c config.mk config.h client.h cursor-shape-v1-protocol.h xdg-shell-protocol.h wlr-layer-shell-unstable-v1-protocol.h pointer-constraints-unstable-v1-protocol.h
 util.o: util.c util.h
 
 # wayland-scanner is a tool which generates C headers and rigging for Wayland
@@ -28,6 +28,9 @@ WAYLAND_PROTOCOLS = `$(PKG_CONFIG) --variable=pkgdatadir wayland-protocols`
 xdg-shell-protocol.h:
 	$(WAYLAND_SCANNER) server-header \
 		$(WAYLAND_PROTOCOLS)/stable/xdg-shell/xdg-shell.xml $@
+pointer-constraints-unstable-v1-protocol.h:
+	$(WAYLAND_SCANNER) server-header \
+		$(WAYLAND_PROTOCOLS)/unstable/pointer-constraints/pointer-constraints-unstable-v1.xml $@
 wlr-layer-shell-unstable-v1-protocol.h:
 	$(WAYLAND_SCANNER) server-header \
 		protocols/wlr-layer-shell-unstable-v1.xml $@

dwl.c

@@ -1,6 +1,7 @@
 /*
  * See LICENSE file for copyright and license details.
  */
+#include <assert.h>
 #include <getopt.h>
 #include <libinput.h>
 #include <linux/input-event-codes.h>
@@ -35,8 +36,10 @@
 #include <wlr/types/wlr_output_management_v1.h>
 #include <wlr/types/wlr_pointer.h>
 #include <wlr/types/wlr_presentation_time.h>
+#include <wlr/types/wlr_pointer_constraints_v1.h>
 #include <wlr/types/wlr_primary_selection.h>
 #include <wlr/types/wlr_primary_selection_v1.h>
+#include <wlr/types/wlr_relative_pointer_v1.h>
 #include <wlr/types/wlr_scene.h>
 #include <wlr/types/wlr_screencopy_v1.h>
 #include <wlr/types/wlr_seat.h>
@@ -209,6 +212,13 @@ typedef struct {
 	int x, y;
 } MonitorRule;
 
+struct pointer_constraint {
+	struct wlr_pointer_constraint_v1 *constraint;
+
+	struct wl_listener set_region;
+	struct wl_listener destroy;
+};
+
 typedef struct {
 	const char *id;
 	const char *title;
@@ -251,6 +261,7 @@ static void createlocksurface(struct wl_listener *listener, void *data);
 static void createmon(struct wl_listener *listener, void *data);
 static void createnotify(struct wl_listener *listener, void *data);
 static void createpointer(struct wlr_pointer *pointer);
+static void createpointerconstraint(struct wl_listener *listener, void *data);
 static void cursorframe(struct wl_listener *listener, void *data);
 static void destroydragicon(struct wl_listener *listener, void *data);
 static void destroyidleinhibitor(struct wl_listener *listener, void *data);
@@ -260,12 +271,14 @@ static void destroylocksurface(struct wl_listener *listener, void *data);
 static void destroynotify(struct wl_listener *listener, void *data);
 static void destroysessionlock(struct wl_listener *listener, void *data);
 static void destroysessionmgr(struct wl_listener *listener, void *data);
+static void destroypointerconstraint(struct wl_listener *listener, void *data);
 static Monitor *dirtomon(enum wlr_direction dir);
 static void focusclient(Client *c, int lift);
 static void focusmon(const Arg *arg);
 static void focusstack(const Arg *arg);
 static Client *focustop(Monitor *m);
 static void fullscreennotify(struct wl_listener *listener, void *data);
+static void handleconstraintcommit(struct wl_listener *listener, void *data);
 static void handlesig(int signo);
 static void incnmaster(const Arg *arg);
 static void inputdevice(struct wl_listener *listener, void *data);
@@ -377,6 +390,11 @@ static struct wlr_box sgeom;
 static struct wl_list mons;
 static Monitor *selmon;
 
+struct wlr_pointer_constraints_v1 *pointer_constraints;
+struct wlr_pointer_constraint_v1 *active_constraint;
+static struct wl_listener constraint_commit;
+struct wlr_relative_pointer_manager_v1 *relative_pointer_manager;
+
 #ifdef XWAYLAND
 static void activatex11(struct wl_listener *listener, void *data);
 static void associatex11(struct wl_listener *listener, void *data);
@@ -930,6 +948,30 @@ createmon(struct wl_listener *listener, void *data)
 	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, LENGTH(m->ltsymbol));
 }
 
+void
+createpointerconstraint(struct wl_listener *listener, void *data)
+{
+	if (focustop(selmon)) {
+		struct wlr_pointer_constraint_v1 *constraint = data;
+		struct pointer_constraint *pointer_constraint = calloc(1, sizeof(struct pointer_constraint));
+		pointer_constraint->constraint = constraint;
+
+		pointer_constraint->destroy.notify = destroypointerconstraint;
+		wl_signal_add(&constraint->events.destroy, &pointer_constraint->destroy);
+
+		if (client_surface(focustop(selmon)) == constraint->surface) {
+			if (active_constraint == constraint)
+				return;
+
+			active_constraint = constraint;
+			wlr_pointer_constraint_v1_send_activated(constraint);
+
+			constraint_commit.notify = handleconstraintcommit;
+			wl_signal_add(&constraint->surface->events.commit, &constraint_commit);
+		}
+	}
+}
+
 void
 createnotify(struct wl_listener *listener, void *data)
 {
@@ -1022,6 +1064,25 @@ createpointer(struct wlr_pointer *pointer)
 	wlr_cursor_attach_input_device(cursor, &pointer->base);
 }
 
+void
+destroypointerconstraint(struct wl_listener *listener, void *data)
+{
+	struct wlr_pointer_constraint_v1 *constraint = data;
+	struct pointer_constraint *pointer_constraint = wl_container_of(listener, pointer_constraint, destroy);
+
+	wl_list_remove(&pointer_constraint->destroy.link);
+
+	if (active_constraint == constraint) {
+		if (constraint_commit.link.next != NULL) {
+			wl_list_remove(&constraint_commit.link);
+		}
+		wl_list_init(&constraint_commit.link);
+		active_constraint = NULL;
+	}
+
+	free(pointer_constraint);
+}
+
 void
 cursorframe(struct wl_listener *listener, void *data)
 {
@@ -1295,6 +1356,12 @@ fullscreennotify(struct wl_listener *listener, void *data)
 	setfullscreen(c, client_wants_fullscreen(c));
 }
 
+void
+handleconstraintcommit(struct wl_listener *listener, void *data)
+{
+	assert(active_constraint->surface == data);
+}
+
 void
 handlesig(int signo)
 {
@@ -1676,7 +1743,15 @@ motionrelative(struct wl_listener *listener, void *data)
 	 * special configuration applied for the specific input device which
 	 * generated the event. You can pass NULL for the device if you want to move
 	 * the cursor around without any input. */
-	wlr_cursor_move(cursor, &event->pointer->base, event->delta_x, event->delta_y);
+	wlr_relative_pointer_manager_v1_send_relative_motion(
+		relative_pointer_manager,
+		seat, (uint64_t)event->time_msec * 1000,
+		event->delta_x, event->delta_y, event->unaccel_dx, event->unaccel_dy);
+
+	if (!active_constraint) {
+		wlr_cursor_move(cursor, &event->pointer->base,
+			event->delta_x, event->delta_y);
+	}
 	motionnotify(event->time_msec);
 }
 
@@ -2282,6 +2357,11 @@ setup(void)
 	xdg_decoration_mgr = wlr_xdg_decoration_manager_v1_create(dpy);
 	LISTEN_STATIC(&xdg_decoration_mgr->events.new_toplevel_decoration, createdecoration);
 
+	pointer_constraints = wlr_pointer_constraints_v1_create(dpy);
+	LISTEN_STATIC(&pointer_constraints->events.new_constraint, createpointerconstraint);
+
+	relative_pointer_manager = wlr_relative_pointer_manager_v1_create(dpy);
+
 	/*
 	 * Creates a cursor, which is a wlroots utility for tracking the cursor
 	 * image shown on screen.