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gtk/modules/other/gail/gailutil.c

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/* GAIL - The GNOME Accessibility Implementation Library
* Copyright 2001, 2002, 2003 Sun Microsystems Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <gtk/gtk.h>
#include "gailutil.h"
#include "gailtoplevel.h"
#include "gailwindow.h"
#include "gail-private-macros.h"
static void gail_util_class_init (GailUtilClass *klass);
static void gail_util_init (GailUtil *utils);
/* atkutil.h */
static guint gail_util_add_global_event_listener (GSignalEmissionHook listener,
const gchar* event_type);
static void gail_util_remove_global_event_listener (guint remove_listener);
static guint gail_util_add_key_event_listener (AtkKeySnoopFunc listener,
gpointer data);
static void gail_util_remove_key_event_listener (guint remove_listener);
static AtkObject* gail_util_get_root (void);
static G_CONST_RETURN gchar *gail_util_get_toolkit_name (void);
static G_CONST_RETURN gchar *gail_util_get_toolkit_version (void);
/* gailmisc/AtkMisc */
static void gail_misc_class_init (GailMiscClass *klass);
static void gail_misc_init (GailMisc *misc);
static void gail_misc_threads_enter (AtkMisc *misc);
static void gail_misc_threads_leave (AtkMisc *misc);
/* Misc */
static void _listener_info_destroy (gpointer data);
static guint add_listener (GSignalEmissionHook listener,
const gchar *object_type,
const gchar *signal,
const gchar *hook_data);
static void do_window_event_initialization (void);
static gboolean state_event_watcher (GSignalInvocationHint *hint,
guint n_param_values,
const GValue *param_values,
gpointer data);
static void window_added (AtkObject *atk_obj,
guint index,
AtkObject *child);
static void window_removed (AtkObject *atk_obj,
guint index,
AtkObject *child);
static gboolean window_focus (GtkWidget *widget,
GdkEventFocus *event);
static gboolean configure_event_watcher (GSignalInvocationHint *hint,
guint n_param_values,
const GValue *param_values,
gpointer data);
static AtkObject* root = NULL;
static GHashTable *listener_list = NULL;
static gint listener_idx = 1;
static GHashTable *key_listener_list = NULL;
static guint key_snooper_id = 0;
typedef struct _GailUtilListenerInfo GailUtilListenerInfo;
typedef struct _GailKeyEventInfo GailKeyEventInfo;
struct _GailUtilListenerInfo
{
gint key;
guint signal_id;
gulong hook_id;
};
struct _GailKeyEventInfo
{
AtkKeyEventStruct *key_event;
gpointer func_data;
};
G_DEFINE_TYPE (GailUtil, gail_util, ATK_TYPE_UTIL)
static void
gail_util_class_init (GailUtilClass *klass)
{
AtkUtilClass *atk_class;
gpointer data;
data = g_type_class_peek (ATK_TYPE_UTIL);
atk_class = ATK_UTIL_CLASS (data);
atk_class->add_global_event_listener =
gail_util_add_global_event_listener;
atk_class->remove_global_event_listener =
gail_util_remove_global_event_listener;
atk_class->add_key_event_listener =
gail_util_add_key_event_listener;
atk_class->remove_key_event_listener =
gail_util_remove_key_event_listener;
atk_class->get_root = gail_util_get_root;
atk_class->get_toolkit_name = gail_util_get_toolkit_name;
atk_class->get_toolkit_version = gail_util_get_toolkit_version;
listener_list = g_hash_table_new_full(g_int_hash, g_int_equal, NULL,
_listener_info_destroy);
}
static void
gail_util_init (GailUtil *utils)
{
}
static guint
gail_util_add_global_event_listener (GSignalEmissionHook listener,
const gchar *event_type)
{
guint rc = 0;
gchar **split_string;
split_string = g_strsplit (event_type, ":", 3);
if (split_string)
{
if (!strcmp ("window", split_string[0]))
{
static gboolean initialized = FALSE;
if (!initialized)
{
do_window_event_initialization ();
initialized = TRUE;
}
rc = add_listener (listener, "GailWindow", split_string[1], event_type);
}
else
{
rc = add_listener (listener, split_string[1], split_string[2], event_type);
}
g_strfreev (split_string);
}
return rc;
}
static void
gail_util_remove_global_event_listener (guint remove_listener)
{
if (remove_listener > 0)
{
GailUtilListenerInfo *listener_info;
gint tmp_idx = remove_listener;
listener_info = (GailUtilListenerInfo *)
g_hash_table_lookup(listener_list, &tmp_idx);
if (listener_info != NULL)
{
/* Hook id of 0 and signal id of 0 are invalid */
if (listener_info->hook_id != 0 && listener_info->signal_id != 0)
{
/* Remove the emission hook */
g_signal_remove_emission_hook(listener_info->signal_id,
listener_info->hook_id);
/* Remove the element from the hash */
g_hash_table_remove(listener_list, &tmp_idx);
}
else
{
g_warning("Invalid listener hook_id %ld or signal_id %d\n",
listener_info->hook_id, listener_info->signal_id);
}
}
else
{
g_warning("No listener with the specified listener id %d",
remove_listener);
}
}
else
{
g_warning("Invalid listener_id %d", remove_listener);
}
}
static
AtkKeyEventStruct *
atk_key_event_from_gdk_event_key (GdkEventKey *key)
{
AtkKeyEventStruct *event = g_new0 (AtkKeyEventStruct, 1);
switch (key->type)
{
case GDK_KEY_PRESS:
event->type = ATK_KEY_EVENT_PRESS;
break;
case GDK_KEY_RELEASE:
event->type = ATK_KEY_EVENT_RELEASE;
break;
default:
g_assert_not_reached ();
return NULL;
}
event->state = key->state;
event->keyval = key->keyval;
event->length = key->length;
if (key->string && key->string [0] &&
(key->state & GDK_CONTROL_MASK ||
g_unichar_isgraph (g_utf8_get_char (key->string))))
{
event->string = key->string;
}
else if (key->type == GDK_KEY_PRESS ||
key->type == GDK_KEY_RELEASE)
{
event->string = gdk_keyval_name (key->keyval);
}
event->keycode = key->hardware_keycode;
event->timestamp = key->time;
#ifdef GAIL_DEBUG
g_print ("GailKey:\tsym %u\n\tmods %x\n\tcode %u\n\ttime %lx\n",
(unsigned int) event->keyval,
(unsigned int) event->state,
(unsigned int) event->keycode,
(unsigned long int) event->timestamp);
#endif
return event;
}
static gboolean
notify_hf (gpointer key, gpointer value, gpointer data)
{
GailKeyEventInfo *info = (GailKeyEventInfo *) data;
return (*(AtkKeySnoopFunc) value) (info->key_event, info->func_data) ? TRUE : FALSE;
}
static void
insert_hf (gpointer key, gpointer value, gpointer data)
{
GHashTable *new_table = (GHashTable *) data;
g_hash_table_insert (new_table, key, value);
}
static gint
gail_key_snooper (GtkWidget *the_widget, GdkEventKey *event, gpointer func_data)
{
/* notify each AtkKeySnoopFunc in turn... */
GailKeyEventInfo *info = g_new0 (GailKeyEventInfo, 1);
gint consumed = 0;
if (key_listener_list)
{
GHashTable *new_hash = g_hash_table_new (NULL, NULL);
g_hash_table_foreach (key_listener_list, insert_hf, new_hash);
info->key_event = atk_key_event_from_gdk_event_key (event);
info->func_data = func_data;
consumed = g_hash_table_foreach_steal (new_hash, notify_hf, info);
g_hash_table_destroy (new_hash);
}
g_free (info->key_event);
g_free (info);
return (consumed ? 1 : 0);
}
static guint
gail_util_add_key_event_listener (AtkKeySnoopFunc listener,
gpointer data)
{
static guint key=0;
if (!key_listener_list)
{
key_listener_list = g_hash_table_new (NULL, NULL);
key_snooper_id = gtk_key_snooper_install (gail_key_snooper, data);
}
g_hash_table_insert (key_listener_list, GUINT_TO_POINTER (key++), (gpointer) listener);
/* XXX: we don't check to see if n_listeners > MAXUINT */
return key;
}
static void
gail_util_remove_key_event_listener (guint remove_listener)
{
g_hash_table_remove (key_listener_list, GUINT_TO_POINTER (remove_listener));
if (g_hash_table_size (key_listener_list) == 0)
{
gtk_key_snooper_remove (key_snooper_id);
}
}
static AtkObject*
gail_util_get_root (void)
{
if (!root)
{
root = g_object_new (GAIL_TYPE_TOPLEVEL, NULL);
atk_object_initialize (root, NULL);
}
return root;
}
static G_CONST_RETURN gchar *
gail_util_get_toolkit_name (void)
{
return "GAIL";
}
static G_CONST_RETURN gchar *
gail_util_get_toolkit_version (void)
{
/*
* Version is passed in as a -D flag when this file is
* compiled.
*/
return GTK_VERSION;
}
static void
_listener_info_destroy (gpointer data)
{
g_free(data);
}
static guint
add_listener (GSignalEmissionHook listener,
const gchar *object_type,
const gchar *signal,
const gchar *hook_data)
{
GType type;
guint signal_id;
gint rc = 0;
type = g_type_from_name (object_type);
if (type)
{
signal_id = g_signal_lookup (signal, type);
if (signal_id > 0)
{
GailUtilListenerInfo *listener_info;
rc = listener_idx;
listener_info = g_malloc(sizeof(GailUtilListenerInfo));
listener_info->key = listener_idx;
listener_info->hook_id =
g_signal_add_emission_hook (signal_id, 0, listener,
g_strdup (hook_data),
(GDestroyNotify) g_free);
listener_info->signal_id = signal_id;
g_hash_table_insert(listener_list, &(listener_info->key), listener_info);
listener_idx++;
}
else
{
g_warning("Invalid signal type %s\n", signal);
}
}
else
{
g_warning("Invalid object type %s\n", object_type);
}
return rc;
}
static void
do_window_event_initialization (void)
{
AtkObject *root;
/*
* Ensure that GailWindowClass exists.
*/
g_type_class_ref (GAIL_TYPE_WINDOW);
g_signal_add_emission_hook (g_signal_lookup ("window-state-event", GTK_TYPE_WIDGET),
0, state_event_watcher, NULL, (GDestroyNotify) NULL);
g_signal_add_emission_hook (g_signal_lookup ("configure-event", GTK_TYPE_WIDGET),
0, configure_event_watcher, NULL, (GDestroyNotify) NULL);
root = atk_get_root ();
g_signal_connect (root, "children-changed::add",
(GCallback) window_added, NULL);
g_signal_connect (root, "children-changed::remove",
(GCallback) window_removed, NULL);
}
static gboolean
state_event_watcher (GSignalInvocationHint *hint,
guint n_param_values,
const GValue *param_values,
gpointer data)
{
GObject *object;
GtkWidget *widget;
AtkObject *atk_obj;
AtkObject *parent;
GdkEventWindowState *event;
gchar *signal_name;
guint signal_id;
object = g_value_get_object (param_values + 0);
/*
* The object can be a GtkMenu when it is popped up; we ignore this
*/
if (!GTK_IS_WINDOW (object))
return FALSE;
event = g_value_get_boxed (param_values + 1);
gail_return_val_if_fail (event->type == GDK_WINDOW_STATE, FALSE);
widget = GTK_WIDGET (object);
if (event->new_window_state & GDK_WINDOW_STATE_MAXIMIZED)
{
signal_name = "maximize";
}
else if (event->new_window_state & GDK_WINDOW_STATE_ICONIFIED)
{
signal_name = "minimize";
}
else if (event->new_window_state == 0)
{
signal_name = "restore";
}
else
return TRUE;
atk_obj = gtk_widget_get_accessible (widget);
if (GAIL_IS_WINDOW (atk_obj))
{
parent = atk_object_get_parent (atk_obj);
if (parent == atk_get_root ())
{
signal_id = g_signal_lookup (signal_name, GAIL_TYPE_WINDOW);
g_signal_emit (atk_obj, signal_id, 0);
}
return TRUE;
}
else
{
return FALSE;
}
}
static void
window_added (AtkObject *atk_obj,
guint index,
AtkObject *child)
{
GtkWidget *widget;
if (!GAIL_IS_WINDOW (child)) return;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (child));
gail_return_if_fail (widget);
g_signal_connect (widget, "focus-in-event",
(GCallback) window_focus, NULL);
g_signal_connect (widget, "focus-out-event",
(GCallback) window_focus, NULL);
g_signal_emit (child, g_signal_lookup ("create", GAIL_TYPE_WINDOW), 0);
}
static void
window_removed (AtkObject *atk_obj,
guint index,
AtkObject *child)
{
GtkWidget *widget;
GtkWindow *window;
if (!GAIL_IS_WINDOW (child)) return;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (child));
gail_return_if_fail (widget);
window = GTK_WINDOW (widget);
/*
* Deactivate window if it is still focused and we are removing it. This
* can happen when a dialog displayed by gok is removed.
*/
if (window->is_active &&
window->has_toplevel_focus)
{
gchar *signal_name;
AtkObject *atk_obj;
atk_obj = gtk_widget_get_accessible (widget);
signal_name = "deactivate";
g_signal_emit (atk_obj, g_signal_lookup (signal_name, GAIL_TYPE_WINDOW), 0);
}
g_signal_handlers_disconnect_by_func (widget, (gpointer) window_focus, NULL);
g_signal_emit (child, g_signal_lookup ("destroy", GAIL_TYPE_WINDOW), 0);
}
static gboolean
window_focus (GtkWidget *widget,
GdkEventFocus *event)
{
gchar *signal_name;
AtkObject *atk_obj;
g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
atk_obj = gtk_widget_get_accessible (widget);
signal_name = (event->in) ? "activate" : "deactivate";
g_signal_emit (atk_obj, g_signal_lookup (signal_name, GAIL_TYPE_WINDOW), 0);
return FALSE;
}
static gboolean
configure_event_watcher (GSignalInvocationHint *hint,
guint n_param_values,
const GValue *param_values,
gpointer data)
{
GObject *object;
GtkWidget *widget;
AtkObject *atk_obj;
AtkObject *parent;
GdkEvent *event;
gchar *signal_name;
guint signal_id;
object = g_value_get_object (param_values + 0);
if (!GTK_IS_WINDOW (object))
/*
* GtkDrawingArea can send a GDK_CONFIGURE event but we ignore here
*/
return FALSE;
event = g_value_get_boxed (param_values + 1);
if (event->type != GDK_CONFIGURE)
return FALSE;
if (GTK_WINDOW (object)->configure_request_count)
/*
* There is another ConfigureRequest pending so we ignore this one.
*/
return TRUE;
widget = GTK_WIDGET (object);
if (widget->allocation.x == ((GdkEventConfigure *)event)->x &&
widget->allocation.y == ((GdkEventConfigure *)event)->y &&
widget->allocation.width == ((GdkEventConfigure *)event)->width &&
widget->allocation.height == ((GdkEventConfigure *)event)->height)
return TRUE;
if (widget->allocation.width != ((GdkEventConfigure *)event)->width ||
widget->allocation.height != ((GdkEventConfigure *)event)->height)
{
signal_name = "resize";
}
else
{
signal_name = "move";
}
atk_obj = gtk_widget_get_accessible (widget);
if (GAIL_IS_WINDOW (atk_obj))
{
parent = atk_object_get_parent (atk_obj);
if (parent == atk_get_root ())
{
signal_id = g_signal_lookup (signal_name, GAIL_TYPE_WINDOW);
g_signal_emit (atk_obj, signal_id, 0);
}
return TRUE;
}
else
{
return FALSE;
}
}
G_DEFINE_TYPE (GailMisc, gail_misc, ATK_TYPE_MISC)
static void
gail_misc_class_init (GailMiscClass *klass)
{
AtkMiscClass *miscclass = ATK_MISC_CLASS (klass);
miscclass->threads_enter =
gail_misc_threads_enter;
miscclass->threads_leave =
gail_misc_threads_leave;
atk_misc_instance = g_object_new (GAIL_TYPE_MISC, NULL);
}
static void
gail_misc_init (GailMisc *misc)
{
}
static void gail_misc_threads_enter (AtkMisc *misc)
{
GDK_THREADS_ENTER ();
}
static void gail_misc_threads_leave (AtkMisc *misc)
{
GDK_THREADS_LEAVE ();
}
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