desktop-shell/input-panel.c - weston-imx - Git at Google

 /*
  * Copyright © 2010-2012 Intel Corporation
  * Copyright © 2011-2012 Collabora, Ltd.
  * Copyright © 2013 Raspberry Pi Foundation
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice (including the next
  * paragraph) shall be included in all copies or substantial portions of the
  * Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  */

 #include "config.h"

 #include <stdlib.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <string.h>

 #include "shell.h"
 #include "input-method-unstable-v1-server-protocol.h"
 #include "shared/helpers.h"

 struct input_panel_surface {
 	struct wl_resource *resource;
 	struct wl_signal destroy_signal;

 	struct desktop_shell *shell;

 	struct wl_list link;
 	struct weston_surface *surface;
 	struct weston_view *view;
 	struct wl_listener surface_destroy_listener;

 	struct weston_view_animation *anim;

 	struct weston_output *output;
 	uint32_t panel;
 };

 static void
 input_panel_slide_done(struct weston_view_animation *animation, void *data)
 {
 	struct input_panel_surface *ipsurf = data;

 	ipsurf->anim = NULL;
 }

 static void
 show_input_panel_surface(struct input_panel_surface *ipsurf)
 {
 	struct desktop_shell *shell = ipsurf->shell;
 	struct weston_seat *seat;
 	struct weston_surface *focus;
 	float x, y;

 	wl_list_for_each(seat, &shell->compositor->seat_list, link) {
 		struct weston_keyboard *keyboard =
 			weston_seat_get_keyboard(seat);

 		if (!keyboard || !keyboard->focus)
 			continue;
 		focus = weston_surface_get_main_surface(keyboard->focus);
 		if (!focus)
 			continue;
 		ipsurf->output = focus->output;
 		x = ipsurf->output->x + (ipsurf->output->width - ipsurf->surface->width) / 2;
 		y = ipsurf->output->y + ipsurf->output->height - ipsurf->surface->height;
 		weston_view_set_position(ipsurf->view, x, y);
 	}

 	weston_layer_entry_insert(&shell->input_panel_layer.view_list,
 	                          &ipsurf->view->layer_link);
 	weston_view_geometry_dirty(ipsurf->view);
 	weston_view_update_transform(ipsurf->view);
 	ipsurf->surface->is_mapped = true;
 	ipsurf->view->is_mapped = true;
 	weston_surface_damage(ipsurf->surface);

 	if (ipsurf->anim)
 		weston_view_animation_destroy(ipsurf->anim);

 	ipsurf->anim =
 		weston_slide_run(ipsurf->view,
 				 ipsurf->surface->height * 0.9, 0,
 				 input_panel_slide_done, ipsurf);
 }

 static void
 show_input_panels(struct wl_listener *listener, void *data)
 {
 	struct desktop_shell *shell =
 		container_of(listener, struct desktop_shell,
 			     show_input_panel_listener);
 	struct input_panel_surface *ipsurf, *next;

 	shell->text_input.surface = (struct weston_surface*)data;

 	if (shell->showing_input_panels)
 		return;

 	shell->showing_input_panels = true;

 	if (!shell->locked)
 		weston_layer_set_position(&shell->input_panel_layer,
 					  WESTON_LAYER_POSITION_TOP_UI);

 	wl_list_for_each_safe(ipsurf, next,
 			      &shell->input_panel.surfaces, link) {
 		if (ipsurf->surface->width == 0)
 			continue;

 		show_input_panel_surface(ipsurf);
 	}
 }

 static void
 hide_input_panels(struct wl_listener *listener, void *data)
 {
 	struct desktop_shell *shell =
 		container_of(listener, struct desktop_shell,
 			     hide_input_panel_listener);
 	struct weston_view *view, *next;

 	if (!shell->showing_input_panels)
 		return;

 	shell->showing_input_panels = false;

 	if (!shell->locked)
 		weston_layer_unset_position(&shell->input_panel_layer);

 	wl_list_for_each_safe(view, next,
 			      &shell->input_panel_layer.view_list.link,
 			      layer_link.link)
 		weston_view_unmap(view);
 }

 static void
 update_input_panels(struct wl_listener *listener, void *data)
 {
 	struct desktop_shell *shell =
 		container_of(listener, struct desktop_shell,
 			     update_input_panel_listener);

 	memcpy(&shell->text_input.cursor_rectangle, data, sizeof(pixman_box32_t));
 }

 static int
 input_panel_get_label(struct weston_surface *surface, char *buf, size_t len)
 {
 	return snprintf(buf, len, "input panel");
 }

 static void
 input_panel_committed(struct weston_surface *surface, int32_t sx, int32_t sy)
 {
 	struct input_panel_surface *ip_surface = surface->committed_private;
 	struct desktop_shell *shell = ip_surface->shell;
 	struct weston_view *view;
 	float x, y;

 	if (surface->width == 0)
 		return;

 	if (ip_surface->panel) {
 		view = get_default_view(shell->text_input.surface);
 		if (view == NULL)
 			return;
 		x = view->geometry.x + shell->text_input.cursor_rectangle.x2;
 		y = view->geometry.y + shell->text_input.cursor_rectangle.y2;
 	} else {
 		x = ip_surface->output->x + (ip_surface->output->width - surface->width) / 2;
 		y = ip_surface->output->y + ip_surface->output->height - surface->height;
 	}

 	weston_view_set_position(ip_surface->view, x, y);

 	if (!weston_surface_is_mapped(surface) && shell->showing_input_panels)
 		show_input_panel_surface(ip_surface);
 }

 static void
 destroy_input_panel_surface(struct input_panel_surface *input_panel_surface)
 {
 	wl_signal_emit(&input_panel_surface->destroy_signal, input_panel_surface);

 	wl_list_remove(&input_panel_surface->surface_destroy_listener.link);
 	wl_list_remove(&input_panel_surface->link);

 	input_panel_surface->surface->committed = NULL;
 	weston_surface_set_label_func(input_panel_surface->surface, NULL);
 	weston_view_destroy(input_panel_surface->view);

 	free(input_panel_surface);
 }

 static struct input_panel_surface *
 get_input_panel_surface(struct weston_surface *surface)
 {
 	if (surface->committed == input_panel_committed) {
 		return surface->committed_private;
 	} else {
 		return NULL;
 	}
 }

 static void
 input_panel_handle_surface_destroy(struct wl_listener *listener, void *data)
 {
 	struct input_panel_surface *ipsurface = container_of(listener,
 							     struct input_panel_surface,
 							     surface_destroy_listener);

 	if (ipsurface->resource) {
 		wl_resource_destroy(ipsurface->resource);
 	} else {
 		destroy_input_panel_surface(ipsurface);
 	}
 }

 static struct input_panel_surface *
 create_input_panel_surface(struct desktop_shell *shell,
 			   struct weston_surface *surface)
 {
 	struct input_panel_surface *input_panel_surface;

 	input_panel_surface = calloc(1, sizeof *input_panel_surface);
 	if (!input_panel_surface)
 		return NULL;

 	surface->committed = input_panel_committed;
 	surface->committed_private = input_panel_surface;
 	weston_surface_set_label_func(surface, input_panel_get_label);

 	input_panel_surface->shell = shell;

 	input_panel_surface->surface = surface;
 	input_panel_surface->view = weston_view_create(surface);

 	wl_signal_init(&input_panel_surface->destroy_signal);
 	input_panel_surface->surface_destroy_listener.notify = input_panel_handle_surface_destroy;
 	wl_signal_add(&surface->destroy_signal,
 		      &input_panel_surface->surface_destroy_listener);

 	wl_list_init(&input_panel_surface->link);

 	return input_panel_surface;
 }

 static void
 input_panel_surface_set_toplevel(struct wl_client *client,
 				 struct wl_resource *resource,
 				 struct wl_resource *output_resource,
 				 uint32_t position)
 {
 	struct input_panel_surface *input_panel_surface =
 		wl_resource_get_user_data(resource);
 	struct desktop_shell *shell = input_panel_surface->shell;

 	wl_list_insert(&shell->input_panel.surfaces,
 		       &input_panel_surface->link);

 	input_panel_surface->output = weston_output_from_resource(output_resource);
 	input_panel_surface->panel = 0;
 }

 static void
 input_panel_surface_set_overlay_panel(struct wl_client *client,
 				      struct wl_resource *resource)
 {
 	struct input_panel_surface *input_panel_surface =
 		wl_resource_get_user_data(resource);
 	struct desktop_shell *shell = input_panel_surface->shell;

 	wl_list_insert(&shell->input_panel.surfaces,
 		       &input_panel_surface->link);

 	input_panel_surface->panel = 1;
 }

 static const struct zwp_input_panel_surface_v1_interface input_panel_surface_implementation = {
 	input_panel_surface_set_toplevel,
 	input_panel_surface_set_overlay_panel
 };

 static void
 destroy_input_panel_surface_resource(struct wl_resource *resource)
 {
 	struct input_panel_surface *ipsurf =
 		wl_resource_get_user_data(resource);

 	destroy_input_panel_surface(ipsurf);
 }

 static void
 input_panel_get_input_panel_surface(struct wl_client *client,
 				    struct wl_resource *resource,
 				    uint32_t id,
 				    struct wl_resource *surface_resource)
 {
 	struct weston_surface *surface =
 		wl_resource_get_user_data(surface_resource);
 	struct desktop_shell *shell = wl_resource_get_user_data(resource);
 	struct input_panel_surface *ipsurf;

 	if (get_input_panel_surface(surface)) {
 		wl_resource_post_error(surface_resource,
 				       WL_DISPLAY_ERROR_INVALID_OBJECT,
 				       "wl_input_panel::get_input_panel_surface already requested");
 		return;
 	}

 	ipsurf = create_input_panel_surface(shell, surface);
 	if (!ipsurf) {
 		wl_resource_post_error(surface_resource,
 				       WL_DISPLAY_ERROR_INVALID_OBJECT,
 				       "surface->committed already set");
 		return;
 	}

 	ipsurf->resource =
 		wl_resource_create(client,
 				   &zwp_input_panel_surface_v1_interface,
 				   1,
 				   id);
 	wl_resource_set_implementation(ipsurf->resource,
 				       &input_panel_surface_implementation,
 				       ipsurf,
 				       destroy_input_panel_surface_resource);
 }

 static const struct zwp_input_panel_v1_interface input_panel_implementation = {
 	input_panel_get_input_panel_surface
 };

 static void
 unbind_input_panel(struct wl_resource *resource)
 {
 	struct desktop_shell *shell = wl_resource_get_user_data(resource);

 	shell->input_panel.binding = NULL;
 }

 static void
 bind_input_panel(struct wl_client *client,
 	      void *data, uint32_t version, uint32_t id)
 {
 	struct desktop_shell *shell = data;
 	struct wl_resource *resource;

 	resource = wl_resource_create(client,
 				      &zwp_input_panel_v1_interface, 1, id);

 	if (shell->input_panel.binding == NULL) {
 		wl_resource_set_implementation(resource,
 					       &input_panel_implementation,
 					       shell, unbind_input_panel);
 		shell->input_panel.binding = resource;
 		return;
 	}

 	wl_resource_post_error(resource, WL_DISPLAY_ERROR_INVALID_OBJECT,
 			       "interface object already bound");
 }

 void
 input_panel_destroy(struct desktop_shell *shell)
 {
 	wl_list_remove(&shell->show_input_panel_listener.link);
 	wl_list_remove(&shell->hide_input_panel_listener.link);
 }

 int
 input_panel_setup(struct desktop_shell *shell)
 {
 	struct weston_compositor *ec = shell->compositor;

 	shell->show_input_panel_listener.notify = show_input_panels;
 	wl_signal_add(&ec->show_input_panel_signal,
 		      &shell->show_input_panel_listener);
 	shell->hide_input_panel_listener.notify = hide_input_panels;
 	wl_signal_add(&ec->hide_input_panel_signal,
 		      &shell->hide_input_panel_listener);
 	shell->update_input_panel_listener.notify = update_input_panels;
 	wl_signal_add(&ec->update_input_panel_signal,
 		      &shell->update_input_panel_listener);

 	wl_list_init(&shell->input_panel.surfaces);

 	if (wl_global_create(shell->compositor->wl_display,
 			     &zwp_input_panel_v1_interface, 1,
 			     shell, bind_input_panel) == NULL)
 		return -1;

 	return 0;
 }
	/*
	* Copyright © 2010-2012 Intel Corporation
	* Copyright © 2011-2012 Collabora, Ltd.
	* Copyright © 2013 Raspberry Pi Foundation
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice (including the next
	* paragraph) shall be included in all copies or substantial portions of the
	* Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
	* DEALINGS IN THE SOFTWARE.
	*/

	#include "config.h"

	#include <stdlib.h>
	#include <stdint.h>
	#include <stdio.h>
	#include <string.h>

	#include "shell.h"
	#include "input-method-unstable-v1-server-protocol.h"
	#include "shared/helpers.h"

	struct input_panel_surface {
	struct wl_resource *resource;
	struct wl_signal destroy_signal;

	struct desktop_shell *shell;

	struct wl_list link;
	struct weston_surface *surface;
	struct weston_view *view;
	struct wl_listener surface_destroy_listener;

	struct weston_view_animation *anim;

	struct weston_output *output;
	uint32_t panel;
	};

	static void
	input_panel_slide_done(struct weston_view_animation animation, void data)
	{
	struct input_panel_surface *ipsurf = data;

	ipsurf->anim = NULL;
	}

	static void
	show_input_panel_surface(struct input_panel_surface *ipsurf)
	{
	struct desktop_shell *shell = ipsurf->shell;
	struct weston_seat *seat;
	struct weston_surface *focus;
	float x, y;

	wl_list_for_each(seat, &shell->compositor->seat_list, link) {
	struct weston_keyboard *keyboard =
	weston_seat_get_keyboard(seat);

	if (!keyboard \|\| !keyboard->focus)
	continue;
	focus = weston_surface_get_main_surface(keyboard->focus);
	if (!focus)
	continue;
	ipsurf->output = focus->output;
	x = ipsurf->output->x + (ipsurf->output->width - ipsurf->surface->width) / 2;
	y = ipsurf->output->y + ipsurf->output->height - ipsurf->surface->height;
	weston_view_set_position(ipsurf->view, x, y);
	}

	weston_layer_entry_insert(&shell->input_panel_layer.view_list,
	&ipsurf->view->layer_link);
	weston_view_geometry_dirty(ipsurf->view);
	weston_view_update_transform(ipsurf->view);
	ipsurf->surface->is_mapped = true;
	ipsurf->view->is_mapped = true;
	weston_surface_damage(ipsurf->surface);

	if (ipsurf->anim)
	weston_view_animation_destroy(ipsurf->anim);

	ipsurf->anim =
	weston_slide_run(ipsurf->view,
	ipsurf->surface->height * 0.9, 0,
	input_panel_slide_done, ipsurf);
	}

	static void
	show_input_panels(struct wl_listener listener, void data)
	{
	struct desktop_shell *shell =
	container_of(listener, struct desktop_shell,
	show_input_panel_listener);
	struct input_panel_surface ipsurf, next;

	shell->text_input.surface = (struct weston_surface*)data;

	if (shell->showing_input_panels)
	return;

	shell->showing_input_panels = true;

	if (!shell->locked)
	weston_layer_set_position(&shell->input_panel_layer,
	WESTON_LAYER_POSITION_TOP_UI);

	wl_list_for_each_safe(ipsurf, next,
	&shell->input_panel.surfaces, link) {
	if (ipsurf->surface->width == 0)
	continue;

	show_input_panel_surface(ipsurf);
	}
	}

	static void
	hide_input_panels(struct wl_listener listener, void data)
	{
	struct desktop_shell *shell =
	container_of(listener, struct desktop_shell,
	hide_input_panel_listener);
	struct weston_view view, next;

	if (!shell->showing_input_panels)
	return;

	shell->showing_input_panels = false;

	if (!shell->locked)
	weston_layer_unset_position(&shell->input_panel_layer);

	wl_list_for_each_safe(view, next,
	&shell->input_panel_layer.view_list.link,
	layer_link.link)
	weston_view_unmap(view);
	}

	static void
	update_input_panels(struct wl_listener listener, void data)
	{
	struct desktop_shell *shell =
	container_of(listener, struct desktop_shell,
	update_input_panel_listener);

	memcpy(&shell->text_input.cursor_rectangle, data, sizeof(pixman_box32_t));
	}

	static int
	input_panel_get_label(struct weston_surface surface, char buf, size_t len)
	{
	return snprintf(buf, len, "input panel");
	}

	static void
	input_panel_committed(struct weston_surface *surface, int32_t sx, int32_t sy)
	{
	struct input_panel_surface *ip_surface = surface->committed_private;
	struct desktop_shell *shell = ip_surface->shell;
	struct weston_view *view;
	float x, y;

	if (surface->width == 0)
	return;

	if (ip_surface->panel) {
	view = get_default_view(shell->text_input.surface);
	if (view == NULL)
	return;
	x = view->geometry.x + shell->text_input.cursor_rectangle.x2;
	y = view->geometry.y + shell->text_input.cursor_rectangle.y2;
	} else {
	x = ip_surface->output->x + (ip_surface->output->width - surface->width) / 2;
	y = ip_surface->output->y + ip_surface->output->height - surface->height;
	}

	weston_view_set_position(ip_surface->view, x, y);

	if (!weston_surface_is_mapped(surface) && shell->showing_input_panels)
	show_input_panel_surface(ip_surface);
	}

	static void
	destroy_input_panel_surface(struct input_panel_surface *input_panel_surface)
	{
	wl_signal_emit(&input_panel_surface->destroy_signal, input_panel_surface);

	wl_list_remove(&input_panel_surface->surface_destroy_listener.link);
	wl_list_remove(&input_panel_surface->link);

	input_panel_surface->surface->committed = NULL;
	weston_surface_set_label_func(input_panel_surface->surface, NULL);
	weston_view_destroy(input_panel_surface->view);

	free(input_panel_surface);
	}

	static struct input_panel_surface *
	get_input_panel_surface(struct weston_surface *surface)
	{
	if (surface->committed == input_panel_committed) {
	return surface->committed_private;
	} else {
	return NULL;
	}
	}

	static void
	input_panel_handle_surface_destroy(struct wl_listener listener, void data)
	{
	struct input_panel_surface *ipsurface = container_of(listener,
	struct input_panel_surface,
	surface_destroy_listener);

	if (ipsurface->resource) {
	wl_resource_destroy(ipsurface->resource);
	} else {
	destroy_input_panel_surface(ipsurface);
	}
	}

	static struct input_panel_surface *
	create_input_panel_surface(struct desktop_shell *shell,
	struct weston_surface *surface)
	{
	struct input_panel_surface *input_panel_surface;

	input_panel_surface = calloc(1, sizeof *input_panel_surface);
	if (!input_panel_surface)
	return NULL;

	surface->committed = input_panel_committed;
	surface->committed_private = input_panel_surface;
	weston_surface_set_label_func(surface, input_panel_get_label);

	input_panel_surface->shell = shell;

	input_panel_surface->surface = surface;
	input_panel_surface->view = weston_view_create(surface);

	wl_signal_init(&input_panel_surface->destroy_signal);
	input_panel_surface->surface_destroy_listener.notify = input_panel_handle_surface_destroy;
	wl_signal_add(&surface->destroy_signal,
	&input_panel_surface->surface_destroy_listener);

	wl_list_init(&input_panel_surface->link);

	return input_panel_surface;
	}

	static void
	input_panel_surface_set_toplevel(struct wl_client *client,
	struct wl_resource *resource,
	struct wl_resource *output_resource,
	uint32_t position)
	{
	struct input_panel_surface *input_panel_surface =
	wl_resource_get_user_data(resource);
	struct desktop_shell *shell = input_panel_surface->shell;

	wl_list_insert(&shell->input_panel.surfaces,
	&input_panel_surface->link);

	input_panel_surface->output = weston_output_from_resource(output_resource);
	input_panel_surface->panel = 0;
	}

	static void
	input_panel_surface_set_overlay_panel(struct wl_client *client,
	struct wl_resource *resource)
	{
	struct input_panel_surface *input_panel_surface =
	wl_resource_get_user_data(resource);
	struct desktop_shell *shell = input_panel_surface->shell;

	wl_list_insert(&shell->input_panel.surfaces,
	&input_panel_surface->link);

	input_panel_surface->panel = 1;
	}

	static const struct zwp_input_panel_surface_v1_interface input_panel_surface_implementation = {
	input_panel_surface_set_toplevel,
	input_panel_surface_set_overlay_panel
	};

	static void
	destroy_input_panel_surface_resource(struct wl_resource *resource)
	{
	struct input_panel_surface *ipsurf =
	wl_resource_get_user_data(resource);

	destroy_input_panel_surface(ipsurf);
	}

	static void
	input_panel_get_input_panel_surface(struct wl_client *client,
	struct wl_resource *resource,
	uint32_t id,
	struct wl_resource *surface_resource)
	{
	struct weston_surface *surface =
	wl_resource_get_user_data(surface_resource);
	struct desktop_shell *shell = wl_resource_get_user_data(resource);
	struct input_panel_surface *ipsurf;

	if (get_input_panel_surface(surface)) {
	wl_resource_post_error(surface_resource,
	WL_DISPLAY_ERROR_INVALID_OBJECT,
	"wl_input_panel::get_input_panel_surface already requested");
	return;
	}

	ipsurf = create_input_panel_surface(shell, surface);
	if (!ipsurf) {
	wl_resource_post_error(surface_resource,
	WL_DISPLAY_ERROR_INVALID_OBJECT,
	"surface->committed already set");
	return;
	}

	ipsurf->resource =
	wl_resource_create(client,
	&zwp_input_panel_surface_v1_interface,
	1,
	id);
	wl_resource_set_implementation(ipsurf->resource,
	&input_panel_surface_implementation,
	ipsurf,
	destroy_input_panel_surface_resource);
	}

	static const struct zwp_input_panel_v1_interface input_panel_implementation = {
	input_panel_get_input_panel_surface
	};

	static void
	unbind_input_panel(struct wl_resource *resource)
	{
	struct desktop_shell *shell = wl_resource_get_user_data(resource);

	shell->input_panel.binding = NULL;
	}

	static void
	bind_input_panel(struct wl_client *client,
	void *data, uint32_t version, uint32_t id)
	{
	struct desktop_shell *shell = data;
	struct wl_resource *resource;

	resource = wl_resource_create(client,
	&zwp_input_panel_v1_interface, 1, id);

	if (shell->input_panel.binding == NULL) {
	wl_resource_set_implementation(resource,
	&input_panel_implementation,
	shell, unbind_input_panel);
	shell->input_panel.binding = resource;
	return;
	}

	wl_resource_post_error(resource, WL_DISPLAY_ERROR_INVALID_OBJECT,
	"interface object already bound");
	}

	void
	input_panel_destroy(struct desktop_shell *shell)
	{
	wl_list_remove(&shell->show_input_panel_listener.link);
	wl_list_remove(&shell->hide_input_panel_listener.link);
	}

	int
	input_panel_setup(struct desktop_shell *shell)
	{
	struct weston_compositor *ec = shell->compositor;

	shell->show_input_panel_listener.notify = show_input_panels;
	wl_signal_add(&ec->show_input_panel_signal,
	&shell->show_input_panel_listener);
	shell->hide_input_panel_listener.notify = hide_input_panels;
	wl_signal_add(&ec->hide_input_panel_signal,
	&shell->hide_input_panel_listener);
	shell->update_input_panel_listener.notify = update_input_panels;
	wl_signal_add(&ec->update_input_panel_signal,
	&shell->update_input_panel_listener);

	wl_list_init(&shell->input_panel.surfaces);

	if (wl_global_create(shell->compositor->wl_display,
	&zwp_input_panel_v1_interface, 1,
	shell, bind_input_panel) == NULL)
	return -1;

	return 0;
	}