gtkbindings.c

gtk是linux一款强大的夸平台的图形化开发工具

/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * GtkBindingSet: Keybinding manager for GtkObjects.
 * Copyright (C) 1998 Tim Janik
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library 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.
 */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include <ctype.h>
#include <string.h>
#include <stdarg.h>
#include "gtkbindings.h"
#include "gtksignal.h"
#include "gtkwidget.h"
#include "gtkrc.h"


/* --- defines --- */
#define	BINDING_MOD_MASK()	(gtk_accelerator_get_default_mod_mask () | GDK_RELEASE_MASK)


/* --- variables --- */
static GHashTable	*binding_entry_hash_table = NULL;
static GSList		*binding_set_list = NULL;
static const gchar	*key_class_binding_set = "gtk-class-binding-set";
static GQuark		 key_id_class_binding_set = 0;


/* --- functions --- */
static GtkBindingSignal*
binding_signal_new (const gchar *signal_name,
		    guint	 n_args)
{
  GtkBindingSignal *signal;
  
  signal = g_new (GtkBindingSignal, 1);
  signal->next = NULL;
  signal->signal_name = g_strdup (signal_name);
  signal->n_args = n_args;
  signal->args = g_new0 (GtkBindingArg, n_args);
  
  return signal;
}

static void
binding_signal_free (GtkBindingSignal *sig)
{
  guint i;
  
  for (i = 0; i < sig->n_args; i++)
    {
      if (GTK_FUNDAMENTAL_TYPE (sig->args[i].arg_type) == GTK_TYPE_STRING)
	g_free (sig->args[i].d.string_data);
    }
  g_free (sig->args);
  g_free (sig->signal_name);
  g_free (sig);
}

static guint
binding_entry_hash (gconstpointer  key)
{
  register const GtkBindingEntry *e = key;
  register guint h;

  h = e->keyval;
  h ^= e->modifiers;

  return h;
}

static gint
binding_entries_compare (gconstpointer  a,
			 gconstpointer  b)
{
  register const GtkBindingEntry *ea = a;
  register const GtkBindingEntry *eb = b;

  return (ea->keyval == eb->keyval && ea->modifiers == eb->modifiers);
}

static GtkBindingEntry*
binding_entry_new (GtkBindingSet *binding_set,
		   guint          keyval,
		   guint          modifiers)
{
  GtkBindingEntry *entry;
  
  if (!binding_entry_hash_table)
    binding_entry_hash_table = g_hash_table_new (binding_entry_hash, binding_entries_compare);

  entry = g_new (GtkBindingEntry, 1);
  entry->keyval = keyval;
  entry->modifiers = modifiers;
  entry->binding_set = binding_set,
  entry->destroyed = FALSE;
  entry->in_emission = FALSE;
  entry->signals = NULL;

  entry->set_next = binding_set->entries;
  binding_set->entries = entry;

  entry->hash_next = g_hash_table_lookup (binding_entry_hash_table, entry);
  g_hash_table_freeze (binding_entry_hash_table);
  if (entry->hash_next)
    g_hash_table_remove (binding_entry_hash_table, entry->hash_next);
  g_hash_table_insert (binding_entry_hash_table, entry, entry);
  g_hash_table_thaw (binding_entry_hash_table);
  
  return entry;
}

static void
binding_entry_free (GtkBindingEntry *entry)
{
  GtkBindingSignal *sig;

  g_assert (entry->set_next == NULL &&
	    entry->hash_next == NULL &&
	    entry->in_emission == FALSE &&
	    entry->destroyed == TRUE);

  entry->destroyed = FALSE;
  
  sig = entry->signals;
  while (sig)
    {
      GtkBindingSignal *prev;
      
      prev = sig;
      sig = prev->next;
      binding_signal_free (prev);
    }
  g_free (entry);
}

static void
binding_entry_destroy (GtkBindingEntry *entry)
{
  GtkBindingEntry *o_entry;
  register GtkBindingEntry *tmp;
  GtkBindingEntry *begin;
  register GtkBindingEntry *last;

  /* unlink from binding set
   */
  last = NULL;
  tmp = entry->binding_set->entries;
  while (tmp)
    {
      if (tmp == entry)
	{
	  if (last)
	    last->set_next = entry->set_next;
	  else
	    entry->binding_set->entries = entry->set_next;
	  break;
	}
      last = tmp;
      tmp = last->set_next;
    }
  entry->set_next = NULL;
  
  o_entry = g_hash_table_lookup (binding_entry_hash_table, entry);
  begin = o_entry;
  last = NULL;
  tmp = begin;
  while (tmp)
    {
      if (tmp == entry)
	{
	  if (last)
	    last->hash_next = entry->hash_next;
	  else
	    begin = entry->hash_next;
	  break;
	}
      last = tmp;
      tmp = last->hash_next;
    }
  entry->hash_next = NULL;
  
  if (!begin)
    g_hash_table_remove (binding_entry_hash_table, entry);
  else if (begin != o_entry)
    {
      g_hash_table_freeze (binding_entry_hash_table);
      g_hash_table_remove (binding_entry_hash_table, entry);
      g_hash_table_insert (binding_entry_hash_table, begin, begin);
      g_hash_table_thaw (binding_entry_hash_table);
    }

  entry->destroyed = TRUE;

  if (!entry->in_emission)
    binding_entry_free (entry);
}

static GtkBindingEntry*
binding_ht_lookup_list (guint keyval,
			guint modifiers)
{
  GtkBindingEntry lookup_entry = { 0 };
  
  if (!binding_entry_hash_table)
    return NULL;
  
  lookup_entry.keyval = keyval;
  lookup_entry.modifiers = modifiers;
  
  return g_hash_table_lookup (binding_entry_hash_table, &lookup_entry);
}

static GtkBindingEntry*
binding_ht_lookup_entry (GtkBindingSet *set,
			 guint		keyval,
			 guint		modifiers)
{
  GtkBindingEntry lookup_entry = { 0 };
  GtkBindingEntry *entry;
  
  if (!binding_entry_hash_table)
    return NULL;
  
  lookup_entry.keyval = keyval;
  lookup_entry.modifiers = modifiers;
  
  entry = g_hash_table_lookup (binding_entry_hash_table, &lookup_entry);
  for (; entry; entry = entry->hash_next)
    if (entry->binding_set == set)
      return entry;

  return NULL;
}

static gboolean
binding_compose_params (GtkBindingArg	*args,
			GtkSignalQuery	*query,
			GtkArg		**params_p)
{
  GtkArg *params;
  const GtkType *types;
  guint i;
  gboolean valid;
  
  params = g_new0 (GtkArg, query->nparams);
  *params_p = params;
  
  types = query->params;
  valid = TRUE;
  for (i = 0; i < query->nparams && valid; i++)
    {
      GtkType param_ftype;

      params->type = *types;
      params->name = NULL;
      param_ftype = GTK_FUNDAMENTAL_TYPE (params->type);
      switch (GTK_FUNDAMENTAL_TYPE (args->arg_type))
	{
	case  GTK_TYPE_DOUBLE:
	  if (param_ftype == GTK_TYPE_FLOAT)
	    GTK_VALUE_FLOAT (*params) = args->d.double_data;
	  else if (param_ftype == GTK_TYPE_DOUBLE)
	    GTK_VALUE_DOUBLE (*params) = args->d.double_data;
	  else
	    valid = FALSE;
	  break;
	case  GTK_TYPE_LONG:
	  if (param_ftype == GTK_TYPE_BOOL &&
	      (args->d.long_data == 0 ||
	       args->d.long_data == 1))
	    GTK_VALUE_BOOL (*params) = args->d.long_data;
	  else if (param_ftype == GTK_TYPE_INT ||
		   param_ftype == GTK_TYPE_ENUM)
	    GTK_VALUE_INT (*params) = args->d.long_data;
	  else if ((param_ftype == GTK_TYPE_UINT ||
		    param_ftype == GTK_TYPE_FLAGS) &&
		   args->d.long_data >= 0)
	    GTK_VALUE_UINT (*params) = args->d.long_data;
	  else if (param_ftype == GTK_TYPE_LONG)
	    GTK_VALUE_LONG (*params) = args->d.long_data;
	  else if (param_ftype == GTK_TYPE_ULONG &&
		   args->d.long_data >= 0)
	    GTK_VALUE_ULONG (*params) = args->d.long_data;
	  else if (param_ftype == GTK_TYPE_FLOAT)
	    GTK_VALUE_FLOAT (*params) = args->d.long_data;
	  else if (param_ftype == GTK_TYPE_DOUBLE)
	    GTK_VALUE_DOUBLE (*params) = args->d.long_data;
	  else
	    valid = FALSE;
	  break;
	case  GTK_TYPE_STRING:
	  if (args->arg_type == GTK_TYPE_STRING &&
	      param_ftype == GTK_TYPE_STRING)
	    GTK_VALUE_STRING (*params) = args->d.string_data;
	  else if (args->arg_type == GTK_TYPE_IDENTIFIER &&
		   (param_ftype == GTK_TYPE_ENUM ||
		    param_ftype == GTK_TYPE_FLAGS))
	    {
	      GtkEnumValue *value;

	      value = gtk_type_enum_find_value (params->type, args->d.string_data);
	      if (value)
		GTK_VALUE_ENUM (*params) = value->value;
	      else
		valid = FALSE;
	    }
	  else
	    valid = FALSE;
	  break;
	default:
	  valid = FALSE;
	  break;
	}
      types++;
      params++;
      args++;
    }
  
  if (!valid)
    {
      g_free (*params_p);
      *params_p = NULL;
    }
  
  return valid;
}

static void
gtk_binding_entry_activate (GtkBindingEntry	*entry,
			    GtkObject	*object)
{
  GtkBindingSignal *sig;
  gboolean old_emission;
  
  old_emission = entry->in_emission;
  entry->in_emission = TRUE;
  
  gtk_object_ref (object);
  
  for (sig = entry->signals; sig; sig = sig->next)
    {
      GtkSignalQuery *query;
      guint signal_id;
      GtkArg *params = NULL;
      gchar *accelerator = NULL;
      
      signal_id = gtk_signal_lookup (sig->signal_name, GTK_OBJECT_TYPE (object));
      if (!signal_id)
	{
	  accelerator = gtk_accelerator_name (entry->keyval, entry->modifiers);
	  g_warning ("gtk_binding_entry_activate(): binding \"%s::%s\": "
		     "could not find signal \"%s\" in the `%s' class ancestry",
		     entry->binding_set->set_name,
		     accelerator,
		     sig->signal_name,
		     gtk_type_name (GTK_OBJECT_TYPE (object)));
	  g_free (accelerator);
	  continue;
	}
      
      query = gtk_signal_query (signal_id);
      if (query->nparams != sig->n_args ||
	  query->return_val != GTK_TYPE_NONE ||
	  !binding_compose_params (sig->args, query, &params))
	{
	  accelerator = gtk_accelerator_name (entry->keyval, entry->modifiers);
	  g_warning ("gtk_binding_entry_activate(): binding \"%s::%s\": "
		     "signature mismatch for signal \"%s\" in the `%s' class ancestry",
		     entry->binding_set->set_name,
		     accelerator,
		     sig->signal_name,
		     gtk_type_name (GTK_OBJECT_TYPE (object)));
	}
      else if (!(query->signal_flags & GTK_RUN_ACTION))
	{
	  accelerator = gtk_accelerator_name (entry->keyval, entry->modifiers);
	  g_warning ("gtk_binding_entry_activate(): binding \"%s::%s\": "
		     "signal \"%s\" in the `%s' class ancestry cannot be used for action emissions",
		     entry->binding_set->set_name,
		     accelerator,
		     sig->signal_name,
		     gtk_type_name (GTK_OBJECT_TYPE (object)));
	}
      g_free (accelerator);
      g_free (query);
      if (accelerator)
	continue;

      gtk_signal_emitv (object, signal_id, params);
      g_free (params);
      
      if (GTK_OBJECT_DESTROYED (object) || entry->destroyed)
	break;
    }
  
  gtk_object_unref (object);

  entry->in_emission = old_emission;
  if (entry->destroyed && !entry->in_emission)
    binding_entry_free (entry);
}

GtkBindingSet*
gtk_binding_set_new (const gchar    *set_name)
{
  GtkBindingSet *binding_set;
  
  g_return_val_if_fail (set_name != NULL, NULL);
  
  binding_set = g_new (GtkBindingSet, 1);
  binding_set->set_name = g_strdup (set_name);
  binding_set->widget_path_pspecs = NULL;
  binding_set->widget_class_pspecs = NULL;
  binding_set->class_branch_pspecs = NULL;
  binding_set->entries = NULL;
  binding_set->current = NULL;
  
  binding_set_list = g_slist_prepend (binding_set_list, binding_set);
  
  return binding_set;
}

GtkBindingSet*
gtk_binding_set_by_class (gpointer object_class)
{
  GtkObjectClass *class = object_class;
  GtkBindingSet* binding_set;

  g_return_val_if_fail (GTK_IS_OBJECT_CLASS (class), NULL);

  if (!key_id_class_binding_set)
    key_id_class_binding_set = g_quark_from_static_string (key_class_binding_set);

  binding_set = g_dataset_id_get_data (class, key_id_class_binding_set);

  if (binding_set)
    return binding_set;

  binding_set = gtk_binding_set_new (gtk_type_name (class->type));
  gtk_binding_set_add_path (binding_set,
			    GTK_PATH_CLASS,
			    gtk_type_name (class->type),
			    GTK_PATH_PRIO_GTK);
  g_dataset_id_set_data (class, key_id_class_binding_set, binding_set);

  return binding_set;
}

GtkBindingSet*
gtk_binding_set_find (const gchar    *set_name)
{
  GSList *slist;
  
  g_return_val_if_fail (set_name != NULL, NULL);
  
  for (slist = binding_set_list; slist; slist = slist->next)
    {
      GtkBindingSet *binding_set;
      
      binding_set = slist->data;
      if (g_str_equal (binding_set->set_name, (gpointer) set_name))
	return binding_set;
    }
  return NULL;