gtkeditable.c

gtk是linux一款强大的夸平台的图形化开发工具

gtk_editable_get_public_chars (GtkEditable      *editable,
			       gint              start,
			       gint              end)
{
  if (editable->visible)
    return gtk_editable_get_chars (editable, start, end);
  else
    {
      gint i;
      gint nchars = end - start;
      gchar *str;
       
      if (nchars < 0)
	nchars = -nchars;

      str = g_new (gchar, nchars + 1);
      for (i = 0; i<nchars; i++)
	str[i] = '*';
      str[i] = '\0';

      return str;
    }
}

static void
gtk_editable_set_selection (GtkEditable *editable,
			    gint      start_pos,
			    gint      end_pos)
{
  GtkEditableClass *klass;

  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));

  klass = GTK_EDITABLE_CLASS (GTK_OBJECT (editable)->klass);

  klass->set_selection (editable, start_pos, end_pos);
}

void
gtk_editable_set_position (GtkEditable      *editable,
			   gint              position)
{
  GtkEditableClass *klass;

  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));

  klass = GTK_EDITABLE_CLASS (GTK_OBJECT (editable)->klass);

  klass->set_position (editable, position);
}

gint
gtk_editable_get_position (GtkEditable      *editable)
{
  g_return_val_if_fail (editable != NULL, -1);
  g_return_val_if_fail (GTK_IS_EDITABLE (editable), -1);

  return editable->current_pos;
}

static gint
gtk_editable_selection_clear (GtkWidget         *widget,
			      GdkEventSelection *event)
{
  GtkEditable *editable;
  
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_EDITABLE (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);
  
  /* Let the selection handling code know that the selection
   * has been changed, since we've overriden the default handler */
  if (!gtk_selection_clear (widget, event))
    return FALSE;
  
  editable = GTK_EDITABLE (widget);
  
  if (event->selection == GDK_SELECTION_PRIMARY)
    {
      if (editable->has_selection)
	{
	  editable->has_selection = FALSE;
	  gtk_editable_update_text (editable, editable->selection_start_pos,
				    editable->selection_end_pos);
	}
    }
  else if (event->selection == clipboard_atom)
    {
      g_free (editable->clipboard_text);
      editable->clipboard_text = NULL;
    }
  
  return TRUE;
}

static void
gtk_editable_selection_get (GtkWidget        *widget,
			    GtkSelectionData *selection_data,
			    guint             info,
			    guint             time)
{
  GtkEditable *editable;
  gint selection_start_pos;
  gint selection_end_pos;

  gchar *str;
  gint length;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (widget));

  editable = GTK_EDITABLE (widget);

  if (selection_data->selection == GDK_SELECTION_PRIMARY)
    {
      selection_start_pos = MIN (editable->selection_start_pos, editable->selection_end_pos);
      selection_end_pos = MAX (editable->selection_start_pos, editable->selection_end_pos);
      str = gtk_editable_get_public_chars(editable, 
					  selection_start_pos, 
					  selection_end_pos);
      if (!str)
	 return;		/* Refuse */
      length = strlen (str);
    }
  else				/* CLIPBOARD */
    {
      if (!editable->clipboard_text)
	return;			/* Refuse */

      str = editable->clipboard_text;
      length = strlen (editable->clipboard_text);
    }
  
  if (info == TARGET_STRING)
    {
      gtk_selection_data_set (selection_data,
                              GDK_SELECTION_TYPE_STRING,
                              8*sizeof(gchar), (guchar *)str, length);
    }
  else if ((info == TARGET_TEXT) || (info == TARGET_COMPOUND_TEXT))
    {
      guchar *text;
      gchar c;
      GdkAtom encoding;
      gint format;
      gint new_length;

      c = str[length];
      str[length] = '\0';
      gdk_string_to_compound_text (str, &encoding, &format, &text, &new_length);
      gtk_selection_data_set (selection_data, encoding, format, text, new_length);
      gdk_free_compound_text (text);
      str[length] = c;
    }

  if (str != editable->clipboard_text)
    g_free (str);
}

static void
gtk_editable_selection_received  (GtkWidget         *widget,
				  GtkSelectionData  *selection_data,
				  guint              time)
{
  GtkEditable *editable;
  gint reselect;
  gint old_pos;
  gint tmp_pos;
  enum {INVALID, STRING, CTEXT} type;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (widget));

  editable = GTK_EDITABLE (widget);

  if (selection_data->type == GDK_TARGET_STRING)
    type = STRING;
  else if ((selection_data->type == gdk_atom_intern ("COMPOUND_TEXT", FALSE)) ||
	   (selection_data->type == gdk_atom_intern ("TEXT", FALSE)))
    type = CTEXT;
  else
    type = INVALID;

  if (type == INVALID || selection_data->length < 0)
    {
    /* avoid infinite loop */
    if (selection_data->target != GDK_TARGET_STRING)
      gtk_selection_convert (widget, selection_data->selection,
			     GDK_TARGET_STRING, time);
    return;
  }

  reselect = FALSE;

  if ((editable->selection_start_pos != editable->selection_end_pos) && 
      (!editable->has_selection || 
       (selection_data->selection == clipboard_atom)))
    {
      reselect = TRUE;

      /* Don't want to call gtk_editable_delete_selection here if we are going
       * to reclaim the selection to avoid extra server traffic */
      if (editable->has_selection)
	{
	  gtk_editable_delete_text (editable,
				 MIN (editable->selection_start_pos, editable->selection_end_pos),
				 MAX (editable->selection_start_pos, editable->selection_end_pos));
	}
      else
	gtk_editable_delete_selection (editable);
    }

  tmp_pos = old_pos = editable->current_pos;

  switch (type)
    {
    case STRING:
      selection_data->data[selection_data->length] = 0;
      gtk_editable_insert_text (editable, (gchar *)selection_data->data,
				strlen ((gchar *)selection_data->data), 
				&tmp_pos);
      editable->current_pos = tmp_pos;
      break;
    case CTEXT:
      {
	gchar **list;
	gint count;
	gint i;

	count = gdk_text_property_to_text_list (selection_data->type,
						selection_data->format, 
	      					selection_data->data,
						selection_data->length,
						&list);
	for (i=0; i<count; i++) 
	  {
	    gtk_editable_insert_text (editable, list[i], strlen (list[i]), &tmp_pos);
	    editable->current_pos = tmp_pos;
	  }
	if (count > 0)
	  gdk_free_text_list (list);
      }
      break;
    case INVALID:		/* quiet compiler */
      break;
    }

  if (reselect)
    gtk_editable_set_selection (editable, old_pos, editable->current_pos);
}

void
gtk_editable_delete_selection (GtkEditable *editable)
{
  guint start;
  guint end;

  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));

  if (!editable->editable)
    return;

  start = editable->selection_start_pos;
  end = editable->selection_end_pos;

  editable->selection_start_pos = 0;
  editable->selection_end_pos = 0;

  if (start != end)
    gtk_editable_delete_text (editable, MIN (start, end), MAX (start,end));

  if (editable->has_selection)
    {
      editable->has_selection = FALSE;
      if (gdk_selection_owner_get (GDK_SELECTION_PRIMARY) == GTK_WIDGET (editable)->window)
	gtk_selection_owner_set (NULL, GDK_SELECTION_PRIMARY, GDK_CURRENT_TIME);
    }
}

void
gtk_editable_claim_selection (GtkEditable *editable, 
			      gboolean  claim, 
			      guint32   time)
{
  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));
  g_return_if_fail (GTK_WIDGET_REALIZED (editable));

  editable->has_selection = FALSE;
  
  if (claim)
    {
      if (gtk_selection_owner_set (GTK_WIDGET(editable), GDK_SELECTION_PRIMARY, time))
	editable->has_selection = TRUE;
    }
  else
    {
      if (gdk_selection_owner_get (GDK_SELECTION_PRIMARY) == 
	  GTK_WIDGET(editable)->window)
	gtk_selection_owner_set (NULL, GDK_SELECTION_PRIMARY, time);
    }
}

void
gtk_editable_select_region (GtkEditable *editable,
			    gint         start,
			    gint         end)
{
  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));
  
  if (GTK_WIDGET_REALIZED (editable))
    gtk_editable_claim_selection (editable, start != end, GDK_CURRENT_TIME);
  
  gtk_editable_set_selection (editable, start, end);
}

/* Get the timestamp of the current event. Actually, the only thing
 * we really care about below is the key event
 */
static guint32
gtk_editable_get_event_time (GtkEditable *editable)
{
  GdkEvent *event;
  guint32 tm = GDK_CURRENT_TIME;
  
  event = gtk_get_current_event();
  
  if (event)
    switch (event->type)
      {
      case GDK_MOTION_NOTIFY:
	tm = event->motion.time; break;
      case GDK_BUTTON_PRESS:
      case GDK_2BUTTON_PRESS:
      case GDK_3BUTTON_PRESS:
      case GDK_BUTTON_RELEASE:
	tm = event->button.time; break;
      case GDK_KEY_PRESS:
      case GDK_KEY_RELEASE:
	tm = event->key.time; break;
      case GDK_ENTER_NOTIFY:
      case GDK_LEAVE_NOTIFY:
	tm = event->crossing.time; break;
      case GDK_PROPERTY_NOTIFY:
	tm = event->property.time; break;
      case GDK_SELECTION_CLEAR:
      case GDK_SELECTION_REQUEST:
      case GDK_SELECTION_NOTIFY:
	tm = event->selection.time; break;
      case GDK_PROXIMITY_IN:
      case GDK_PROXIMITY_OUT:
	tm = event->proximity.time; break;
      default:			/* use current time */
	break;
      }
  gdk_event_free(event);
  
  return tm;
}

void
gtk_editable_cut_clipboard (GtkEditable *editable)
{
  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));
  
  gtk_signal_emit (GTK_OBJECT (editable), editable_signals[CUT_CLIPBOARD]);
}

void
gtk_editable_copy_clipboard (GtkEditable *editable)
{
  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));
  
  gtk_signal_emit (GTK_OBJECT (editable), editable_signals[COPY_CLIPBOARD]);
}

void
gtk_editable_paste_clipboard (GtkEditable *editable)
{
  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));
  
  gtk_signal_emit (GTK_OBJECT (editable), editable_signals[PASTE_CLIPBOARD]);
}

void
gtk_editable_set_editable (GtkEditable    *editable,
			   gboolean        is_editable)
{
  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));
  
  gtk_signal_emit (GTK_OBJECT (editable), editable_signals[SET_EDITABLE], is_editable != FALSE);
}

static void
gtk_editable_real_set_editable (GtkEditable    *editable,
				gboolean        is_editable)
{
  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));

  editable->editable = is_editable != FALSE;
  gtk_widget_queue_draw (GTK_WIDGET (editable));
}

static void
gtk_editable_real_cut_clipboard (GtkEditable *editable)
{
  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));
  
  gtk_editable_real_copy_clipboard (editable);
  gtk_editable_delete_selection (editable);
}

static void
gtk_editable_real_copy_clipboard (GtkEditable *editable)
{
  guint32 time;
  gint selection_start_pos; 
  gint selection_end_pos;

  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));
  
  time = gtk_editable_get_event_time (editable);
  selection_start_pos = MIN (editable->selection_start_pos, editable->selection_end_pos);
  selection_end_pos = MAX (editable->selection_start_pos, editable->selection_end_pos);
 
  if (selection_start_pos != selection_end_pos)
    {
      if (gtk_selection_owner_set (GTK_WIDGET (editable),
				   clipboard_atom,
				   time))
	editable->clipboard_text = gtk_editable_get_public_chars (editable,
								  selection_start_pos,
								  selection_end_pos);
    }
}

static void
gtk_editable_real_paste_clipboard (GtkEditable *editable)
{
  guint32 time;

  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));
  
  time = gtk_editable_get_event_time (editable);
  if (editable->editable)
    gtk_selection_convert (GTK_WIDGET(editable), 
			   clipboard_atom, 
			   gdk_atom_intern ("COMPOUND_TEXT", FALSE), time);
}

void
gtk_editable_changed (GtkEditable *editable)
{
  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_EDITABLE (editable));
  
  gtk_signal_emit (GTK_OBJECT (editable), editable_signals[CHANGED]);
}

#if 0
static void
gtk_editable_parent_set (GtkWidget *widget, 
			 GtkWidget *old_parent, 
			 GtkWidget *editable)
{
  GtkWidget *parent;

  parent = old_parent;
  while (parent)
    {
      gtk_signal_disconnect_by_func (GTK_OBJECT (parent),
				     GTK_SIGNAL_FUNC (gtk_editable_parent_set),
				     editable);
      parent = parent->parent;
    }

  parent = widget->parent;
  while (parent)
    {
      gtk_signal_connect (GTK_OBJECT (parent), "parent_set",
			  GTK_SIGNAL_FUNC (gtk_editable_parent_set), 
			  editable);
      
      parent = parent->parent;
    }
}
#endif