input: add pointer implementation

input/pointer.c

@@ -0,0 +1,43 @@
+/*
+ * Cage: A Wayland kiosk.
+ *
+ * Copyright (C) 2018-2020 Jente Hidskes
+ * Copyright (C) 2019 The Sway authors
+ *
+ * See the LICENSE file accompanying this file.
+ */
+
+#include <assert.h>
+#include <stdlib.h>
+#include <wlr/types/wlr_input_device.h>
+
+#include "pointer.h"
+
+static void
+handle_pointer_destroy(struct wl_listener *listener, void *data)
+{
+	struct cg_pointer *pointer = wl_container_of(listener, pointer, destroy);
+	cage_pointer_fini(pointer);
+}
+
+void
+cage_pointer_init(struct cg_pointer *pointer, struct wlr_input_device *device)
+{
+	assert(pointer != NULL);
+	assert(device != NULL);
+
+	pointer->device = device;
+	pointer->destroy.notify = handle_pointer_destroy;
+	wl_signal_add(&device->events.destroy, &pointer->destroy);
+}
+
+void
+cage_pointer_fini(struct cg_pointer *pointer)
+{
+	assert(pointer != NULL);
+
+	wl_list_remove(&pointer->link);
+	wl_list_remove(&pointer->destroy.link);
+
+	free(pointer);
+}

input/pointer.h

@@ -0,0 +1,17 @@
+#ifndef CG_POINTER_H
+#define CG_POINTER_H
+
+#include <wayland-server-core.h>
+#include <wlr/types/wlr_input_device.h>
+
+struct cg_pointer {
+	struct wl_list link; // seat::pointers
+	struct wlr_input_device *device;
+
+	struct wl_listener destroy;
+};
+
+void cage_pointer_init(struct cg_pointer *pointer, struct wlr_input_device *device);
+void cage_pointer_fini(struct cg_pointer *pointer);
+
+#endif

input/seat.c

@@ -9,11 +9,46 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <wayland-server-core.h>
+#include <wlr/types/wlr_input_device.h>
 #include <wlr/types/wlr_seat.h>
+#include <wlr/util/log.h>
 
 #include "cursor.h"
+#include "pointer.h"
 #include "seat.h"
 
+void
+cage_seat_add_new_pointer(struct cg_seat *seat, struct wlr_input_device *device)
+{
+	struct cg_pointer *pointer = calloc(1, sizeof(struct cg_pointer));
+	if (!pointer) {
+		wlr_log(WLR_ERROR, "Cannot allocate pointer");
+		return;
+	}
+
+	cage_pointer_init(pointer, device);
+	wlr_cursor_attach_input_device(seat->cursor->wlr_cursor, device);
+	wl_list_insert(&seat->pointers, &pointer->link);
+}
+
+void
+cage_seat_update_capabilities(struct cg_seat *seat)
+{
+	uint32_t caps = 0;
+
+	if (!wl_list_empty(&seat->pointers)) {
+		caps |= WL_SEAT_CAPABILITY_POINTER;
+	}
+	wlr_seat_set_capabilities(seat->wlr_seat, caps);
+
+	/* Hide cursor if the seat doesn't have pointer capability. */
+	if ((caps & WL_SEAT_CAPABILITY_POINTER) == 0) {
+		cage_cursor_set_image(seat->cursor, NULL);
+	} else {
+		cage_cursor_set_image(seat->cursor, DEFAULT_XCURSOR);
+	}
+}
+
 static void
 handle_seat_destroy(struct wl_listener *listener, void *user_data)
 {
@@ -33,6 +68,8 @@ cage_seat_init(struct cg_seat *seat, struct wlr_seat *wlr_seat, struct cg_cursor
 
 	seat->seat_destroy.notify = handle_seat_destroy;
 	wl_signal_add(&seat->wlr_seat->events.destroy, &seat->seat_destroy);
+
+	wl_list_init(&seat->pointers);
 }
 
 void
@@ -47,5 +84,10 @@ cage_seat_fini(struct cg_seat *seat)
 
 	cage_cursor_fini(seat->cursor);
 
+	struct cg_pointer *pointer, *pointer_tmp;
+	wl_list_for_each_safe (pointer, pointer_tmp, &seat->pointers, link) {
+		cage_pointer_fini(pointer);
+	}
+
 	free(seat);
 }

input/seat.h

@@ -2,6 +2,7 @@
 #define CG_SEAT_H
 
 #include <wayland-server-core.h>
+#include <wlr/types/wlr_input_device.h>
 #include <wlr/types/wlr_seat.h>
 
 #include "cursor.h"
@@ -15,6 +16,8 @@ struct cg_seat {
 	struct wl_list pointers; // cg_pointer::link
 };
 
+void cage_seat_add_new_pointer(struct cg_seat *seat, struct wlr_input_device *device);
+void cage_seat_update_capabilities(struct cg_seat *seat);
 void cage_seat_init(struct cg_seat *seat, struct wlr_seat *wlr_seat, struct cg_cursor *cursor);
 void cage_seat_fini(struct cg_seat *seat);
 

meson.build

@@ -130,6 +130,7 @@ cageng_sources = [
   'desktop/view.c',
   'desktop/xdg_shell.c',
   'input/cursor.c',
+  'input/pointer.c',
   'input/seat.c',
   'cageng.c',
 ]
@@ -144,6 +145,7 @@ cageng_headers = [
   'desktop/view.h',
   'desktop/xdg_shell.h',
   'input/cursor.h',
+  'input/pointer.h',
   'input/seat.h',
   'serverng.h',
 ]