Wayland入门教程08.07：shell stable协议

我们操作的界面是客户端，鼠标点击、窗口移动、窗口大小、键盘输入都是由客户端捕获，然后通过协议发送给服务端。这个协议Wayland由提供默认的，如果默认的满足不了需求，可以自定义协议。协议格式为XML，使用wayland-scanner程序转换为代码。

之前的v1.0文章中使用的是wayland默认的wl_shell，当前使用非官方默认的stable版扩展协议。

需要监听新的注册事件

static void
global_registry_handler(void *data, struct wl_registry *registry,
		uint32_t id, const char *interface, uint32_t version) {
	printf("Got a registry event for %s id %d\n", interface, id);
	if (strcmp(interface, "wl_compositor") == 0) {
		compositor = wl_registry_bind(registry,id,&wl_compositor_interface,version);
	} else if (strcmp(interface, xdg_wm_base_interface.name) == 0) {
		xdg_shell = wl_registry_bind(registry,id,&xdg_wm_base_interface,1);
	}
}

创建新对象

struct xdg_surface *shell_surface = xdg_wm_base_get_xdg_surface(xdg_shell, surface);
if (shell_surface == NULL)
{
	fprintf(stderr, "Can't create shell surface\n");
	exit(1);
}else{
	fprintf(stderr, "Created shell surface\n");
}

编译

协议以xml格式提供，我们在使用时要把它生成为代码。

WAYLAND_FLAGS = $(shell pkg-config wayland-client --cflags --libs)
WAYLAND_PROTOCOLS_DIR = $(shell pkg-config wayland-protocols --variable=pkgdatadir)
WAYLAND_SCANNER = $(shell pkg-config --variable=wayland_scanner wayland-scanner)

XDG_SHELL_PROTOCOL = $(WAYLAND_PROTOCOLS_DIR)/stable/xdg-shell/xdg-shell.xml

HEADERS=xdg-shell-client-protocol.h
SOURCES=xdg-shell-protocol.c

all: $(HEADERS) $(SOURCES)
	gcc -o shell_stable shell_stable.c $(SOURCES) -I. -lwayland-client -lwayland-egl -lEGL -lGL

xdg-shell-client-protocol.h:
	$(WAYLAND_SCANNER) client-header $(XDG_SHELL_PROTOCOL) xdg-shell-client-protocol.h

xdg-shell-protocol.c:
	$(WAYLAND_SCANNER) private-code $(XDG_SHELL_PROTOCOL) xdg-shell-protocol.c

clean:
	rm -rf stable $(HEADERS) $(SOURCES)

编译，运行，输出为

XDG_RUNTIME_DIR= /run/user/1000
connected to display
Got a registry event for wl_compositor id 1
Got a registry event for wl_drm id 2
Got a registry event for wl_shm id 3
Got a registry event for wl_output id 4
Got a registry event for zxdg_output_manager_v1 id 5
Got a registry event for wl_data_device_manager id 6
Got a registry event for zwp_primary_selection_device_manager_v1 id 7
Got a registry event for gtk_primary_selection_device_manager id 8
Got a registry event for wl_subcompositor id 9
Got a registry event for xdg_wm_base id 10
Got a registry event for zxdg_shell_v6 id 11
Got a registry event for gtk_shell1 id 12
Got a registry event for wp_viewporter id 13
Got a registry event for zwp_pointer_gestures_v1 id 14
Got a registry event for zwp_tablet_manager_v2 id 15
Got a registry event for wl_seat id 16
Got a registry event for zwp_relative_pointer_manager_v1 id 17
Got a registry event for zwp_pointer_constraints_v1 id 18
Got a registry event for zxdg_exporter_v1 id 19
Got a registry event for zxdg_importer_v1 id 20
Got a registry event for zwp_linux_dmabuf_v1 id 21
Got a registry event for zwp_keyboard_shortcuts_inhibit_manager_v1 id 22
Got a registry event for zwp_text_input_manager_v3 id 23
Got a registry event for wp_presentation id 24
Got a registry event for xdg_activation_v1 id 25
Found compositor
Created surface
Found valid shell.
Created shell surface
Nothing to display.
disconnected from display