gtkwidget.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
 *
 * 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 <stdarg.h>
#include <string.h>
#include "gtkcontainer.h"
#include "gtkmain.h"
#include "gtkrc.h"
#include "gtkselection.h"
#include "gtksignal.h"
#include "gtkwidget.h"
#include "gtkwindow.h"
#include "gtkbindings.h"
#include "gtkprivate.h"
#include "gdk/gdk.h"
#include "gdk/gdkx.h"


#define WIDGET_CLASS(w)	 GTK_WIDGET_CLASS (GTK_OBJECT (w)->klass)
#define	INIT_PATH_SIZE	(512)


enum {
  SHOW,
  HIDE,
  MAP,
  UNMAP,
  REALIZE,
  UNREALIZE,
  DRAW,
  DRAW_FOCUS,
  DRAW_DEFAULT,
  SIZE_REQUEST,
  SIZE_ALLOCATE,
  STATE_CHANGED,
  PARENT_SET,
  STYLE_SET,
  ADD_ACCELERATOR,
  REMOVE_ACCELERATOR,
  GRAB_FOCUS,
  EVENT,
  BUTTON_PRESS_EVENT,
  BUTTON_RELEASE_EVENT,
  MOTION_NOTIFY_EVENT,
  DELETE_EVENT,
  DESTROY_EVENT,
  EXPOSE_EVENT,
  KEY_PRESS_EVENT,
  KEY_RELEASE_EVENT,
  ENTER_NOTIFY_EVENT,
  LEAVE_NOTIFY_EVENT,
  CONFIGURE_EVENT,
  FOCUS_IN_EVENT,
  FOCUS_OUT_EVENT,
  MAP_EVENT,
  UNMAP_EVENT,
  PROPERTY_NOTIFY_EVENT,
  SELECTION_CLEAR_EVENT,
  SELECTION_REQUEST_EVENT,
  SELECTION_NOTIFY_EVENT,
  SELECTION_GET,
  SELECTION_RECEIVED,
  PROXIMITY_IN_EVENT,
  PROXIMITY_OUT_EVENT,
  DRAG_BEGIN,
  DRAG_END,
  DRAG_DATA_DELETE,
  DRAG_LEAVE,
  DRAG_MOTION,
  DRAG_DROP,
  DRAG_DATA_GET,
  DRAG_DATA_RECEIVED,
  CLIENT_EVENT,
  NO_EXPOSE_EVENT,
  VISIBILITY_NOTIFY_EVENT,
  DEBUG_MSG,
  LAST_SIGNAL
};

enum {
  ARG_0,
  ARG_NAME,
  ARG_PARENT,
  ARG_X,
  ARG_Y,
  ARG_WIDTH,
  ARG_HEIGHT,
  ARG_VISIBLE,
  ARG_SENSITIVE,
  ARG_APP_PAINTABLE,
  ARG_CAN_FOCUS,
  ARG_HAS_FOCUS,
  ARG_CAN_DEFAULT,
  ARG_HAS_DEFAULT,
  ARG_RECEIVES_DEFAULT,
  ARG_COMPOSITE_CHILD,
  ARG_STYLE,
  ARG_EVENTS,
  ARG_EXTENSION_EVENTS
};

typedef	struct	_GtkStateData	 GtkStateData;

struct _GtkStateData
{
  GtkStateType  state;
  guint		state_restoration : 1;
  guint         parent_sensitive : 1;
  guint		use_forall : 1;
};

static void gtk_widget_class_init		 (GtkWidgetClass    *klass);
static void gtk_widget_init			 (GtkWidget	    *widget);
static void gtk_widget_set_arg			 (GtkObject         *object,
						  GtkArg	    *arg,
						  guint		     arg_id);
static void gtk_widget_get_arg			 (GtkObject         *object,
						  GtkArg	    *arg,
						  guint		     arg_id);
static void gtk_widget_shutdown			 (GtkObject	    *object);
static void gtk_widget_real_destroy		 (GtkObject	    *object);
static void gtk_widget_finalize			 (GtkObject	    *object);
static void gtk_widget_real_show		 (GtkWidget	    *widget);
static void gtk_widget_real_hide		 (GtkWidget	    *widget);
static void gtk_widget_real_map			 (GtkWidget	    *widget);
static void gtk_widget_real_unmap		 (GtkWidget	    *widget);
static void gtk_widget_real_realize		 (GtkWidget	    *widget);
static void gtk_widget_real_unrealize		 (GtkWidget	    *widget);
static void gtk_widget_real_draw		 (GtkWidget	    *widget,
						  GdkRectangle	    *area);
static void gtk_widget_real_size_request	 (GtkWidget	    *widget,
						  GtkRequisition    *requisition);
static void gtk_widget_real_size_allocate	 (GtkWidget	    *widget,
						  GtkAllocation	    *allocation);
static gint gtk_widget_real_key_press_event      (GtkWidget         *widget,
						  GdkEventKey       *event);
static gint gtk_widget_real_key_release_event    (GtkWidget         *widget,
						  GdkEventKey       *event);
static void gtk_widget_style_set		 (GtkWidget	    *widget,
						  GtkStyle          *previous_style);
static void gtk_widget_real_grab_focus           (GtkWidget         *focus_widget);

static void  gtk_widget_redraw_queue_remove       (GtkWidget         *widget);

     
static GdkColormap* gtk_widget_peek_colormap (void);
static GdkVisual*   gtk_widget_peek_visual   (void);
static GtkStyle*    gtk_widget_peek_style    (void);

static void gtk_widget_reparent_container_child  (GtkWidget     *widget,
						  gpointer       client_data);
static void gtk_widget_propagate_state		 (GtkWidget	*widget,
						  GtkStateData 	*data);
static void gtk_widget_set_style_internal	 (GtkWidget	*widget,
						  GtkStyle	*style,
						  gboolean	 initial_emission);
static void gtk_widget_set_style_recurse	 (GtkWidget	*widget,
						  gpointer	 client_data);

static gboolean gtk_widget_is_offscreen           (GtkWidget     *widget);

static GtkWidgetAuxInfo* gtk_widget_aux_info_new     (void);
static void		 gtk_widget_aux_info_destroy (GtkWidgetAuxInfo *aux_info);

static GtkObjectClass *parent_class = NULL;
static guint widget_signals[LAST_SIGNAL] = { 0 };

static GMemChunk *aux_info_mem_chunk = NULL;

static GdkColormap *default_colormap = NULL;
static GdkVisual *default_visual = NULL;
static GtkStyle *gtk_default_style = NULL;

static GSList *colormap_stack = NULL;
static GSList *visual_stack = NULL;
static GSList *style_stack = NULL;
static guint   composite_child_stack = 0;
static GSList *gtk_widget_redraw_queue = NULL;

static const gchar *aux_info_key = "gtk-aux-info";
static guint        aux_info_key_id = 0;
static const gchar *event_key = "gtk-event-mask";
static guint        event_key_id = 0;
static const gchar *extension_event_key = "gtk-extension-event-mode";
static guint        extension_event_key_id = 0;
static const gchar *parent_window_key = "gtk-parent-window";
static guint        parent_window_key_id = 0;
static const gchar *saved_default_style_key = "gtk-saved-default-style";
static guint        saved_default_style_key_id = 0;
static const gchar *shape_info_key = "gtk-shape-info";
static const gchar *colormap_key = "gtk-colormap";
static const gchar *visual_key = "gtk-visual";

static const gchar *rc_style_key = "gtk-rc-style";
static guint        rc_style_key_id = 0;

/*****************************************
 * gtk_widget_get_type:
 *
 *   arguments:
 *
 *   results:
 *****************************************/

GtkType
gtk_widget_get_type (void)
{
  static GtkType widget_type = 0;
  
  if (!widget_type)
    {
      static const GtkTypeInfo widget_info =
      {
	"GtkWidget",
	sizeof (GtkWidget),
	sizeof (GtkWidgetClass),
	(GtkClassInitFunc) gtk_widget_class_init,
	(GtkObjectInitFunc) gtk_widget_init,
        /* reserved_1 */ NULL,
	/* reserved_2 */ NULL,
	(GtkClassInitFunc) NULL,
      };
      
      widget_type = gtk_type_unique (gtk_object_get_type (), &widget_info);
    }
  
  return widget_type;
}

/*****************************************
 * gtk_widget_class_init:
 *
 *   arguments:
 *
 *   results:
 *****************************************/
#include "stdio.h"
static void
gtk_widget_debug_msg (GtkWidget          *widget,
		      const gchar        *string)
{
  fprintf (stderr, "Gtk-DEBUG: %s\n", string);
}

static void
gtk_widget_class_init (GtkWidgetClass *klass)
{
  GtkObjectClass *object_class;
  
  object_class = (GtkObjectClass*) klass;
  
  parent_class = gtk_type_class (gtk_object_get_type ());
  
  gtk_object_add_arg_type ("GtkWidget::name", GTK_TYPE_STRING, GTK_ARG_READWRITE, ARG_NAME);
  gtk_object_add_arg_type ("GtkWidget::parent", GTK_TYPE_CONTAINER, GTK_ARG_READWRITE, ARG_PARENT);
  gtk_object_add_arg_type ("GtkWidget::x", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_X);
  gtk_object_add_arg_type ("GtkWidget::y", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_Y);
  gtk_object_add_arg_type ("GtkWidget::width", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_WIDTH);
  gtk_object_add_arg_type ("GtkWidget::height", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_HEIGHT);
  gtk_object_add_arg_type ("GtkWidget::visible", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_VISIBLE);
  gtk_object_add_arg_type ("GtkWidget::sensitive", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_SENSITIVE);
  gtk_object_add_arg_type ("GtkWidget::app_paintable", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_APP_PAINTABLE);
  gtk_object_add_arg_type ("GtkWidget::can_focus", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_CAN_FOCUS);
  gtk_object_add_arg_type ("GtkWidget::has_focus", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_HAS_FOCUS);
  gtk_object_add_arg_type ("GtkWidget::can_default", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_CAN_DEFAULT);
  gtk_object_add_arg_type ("GtkWidget::has_default", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_HAS_DEFAULT);
  gtk_object_add_arg_type ("GtkWidget::receives_default", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_RECEIVES_DEFAULT);
  gtk_object_add_arg_type ("GtkWidget::composite_child", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_COMPOSITE_CHILD);
  gtk_object_add_arg_type ("GtkWidget::style", GTK_TYPE_STYLE, GTK_ARG_READWRITE, ARG_STYLE);
  gtk_object_add_arg_type ("GtkWidget::events", GTK_TYPE_GDK_EVENT_MASK, GTK_ARG_READWRITE, ARG_EVENTS);
  gtk_object_add_arg_type ("GtkWidget::extension_events", GTK_TYPE_GDK_EVENT_MASK, GTK_ARG_READWRITE, ARG_EXTENSION_EVENTS);
  
  widget_signals[SHOW] =
    gtk_signal_new ("show",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, show),
		    gtk_marshal_NONE__NONE,
		    GTK_TYPE_NONE, 0);
  widget_signals[HIDE] =
    gtk_signal_new ("hide",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, hide),
		    gtk_marshal_NONE__NONE,
		    GTK_TYPE_NONE, 0);
  widget_signals[MAP] =
    gtk_signal_new ("map",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, map),
		    gtk_marshal_NONE__NONE,
		    GTK_TYPE_NONE, 0);
  widget_signals[UNMAP] =
    gtk_signal_new ("unmap",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, unmap),
		    gtk_marshal_NONE__NONE,
		    GTK_TYPE_NONE, 0);
  widget_signals[REALIZE] =
    gtk_signal_new ("realize",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, realize),
		    gtk_marshal_NONE__NONE,
		    GTK_TYPE_NONE, 0);
  widget_signals[UNREALIZE] =
    gtk_signal_new ("unrealize",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, unrealize),
		    gtk_marshal_NONE__NONE,
		    GTK_TYPE_NONE, 0);
  widget_signals[DRAW] =
    gtk_signal_new ("draw",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, draw),
		    gtk_marshal_NONE__POINTER,
		    GTK_TYPE_NONE, 1,
		    GTK_TYPE_POINTER);
  widget_signals[DRAW_FOCUS] =
    gtk_signal_new ("draw_focus",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, draw_focus),
		    gtk_marshal_NONE__NONE,
		    GTK_TYPE_NONE, 0);
  widget_signals[DRAW_DEFAULT] =
    gtk_signal_new ("draw_default",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, draw_default),
		    gtk_marshal_NONE__NONE,
		    GTK_TYPE_NONE, 0);
  widget_signals[SIZE_REQUEST] =
    gtk_signal_new ("size_request",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, size_request),
		    gtk_marshal_NONE__POINTER,
		    GTK_TYPE_NONE, 1,
		    GTK_TYPE_POINTER);
  widget_signals[SIZE_ALLOCATE] =
    gtk_signal_new ("size_allocate",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, size_allocate),
		    gtk_marshal_NONE__POINTER,
		    GTK_TYPE_NONE, 1,
		    GTK_TYPE_POINTER);
  widget_signals[STATE_CHANGED] =
    gtk_signal_new ("state_changed",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, state_changed),
		    gtk_marshal_NONE__UINT,
		    GTK_TYPE_NONE, 1,
		    GTK_TYPE_STATE_TYPE);
  widget_signals[PARENT_SET] =
    gtk_signal_new ("parent_set",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, parent_set),
		    gtk_marshal_NONE__OBJECT,
		    GTK_TYPE_NONE, 1,
		    GTK_TYPE_OBJECT);
  widget_signals[STYLE_SET] =
    gtk_signal_new ("style_set",
		    GTK_RUN_FIRST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, style_set),
		    gtk_marshal_NONE__POINTER,
		    GTK_TYPE_NONE, 1,
		    GTK_TYPE_STYLE);
  widget_signals[ADD_ACCELERATOR] =
    gtk_accel_group_create_add (object_class->type, GTK_RUN_LAST,
				GTK_SIGNAL_OFFSET (GtkWidgetClass, add_accelerator));
  widget_signals[REMOVE_ACCELERATOR] =
    gtk_accel_group_create_remove (object_class->type, GTK_RUN_LAST,
				   GTK_SIGNAL_OFFSET (GtkWidgetClass, remove_accelerator));
  widget_signals[GRAB_FOCUS] =
    gtk_signal_new ("grab_focus",
		    GTK_RUN_LAST | GTK_RUN_ACTION,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, grab_focus),
		    gtk_marshal_NONE__NONE,
		    GTK_TYPE_NONE, 0);
  widget_signals[EVENT] =
    gtk_signal_new ("event",
		    GTK_RUN_LAST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, event),
		    gtk_marshal_BOOL__POINTER,
		    GTK_TYPE_BOOL, 1,
		    GTK_TYPE_GDK_EVENT);
  widget_signals[BUTTON_PRESS_EVENT] =
    gtk_signal_new ("button_press_event",
		    GTK_RUN_LAST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, button_press_event),
		    gtk_marshal_BOOL__POINTER,
		    GTK_TYPE_BOOL, 1,
		    GTK_TYPE_GDK_EVENT);
  widget_signals[BUTTON_RELEASE_EVENT] =
    gtk_signal_new ("button_release_event",
		    GTK_RUN_LAST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, button_release_event),
		    gtk_marshal_BOOL__POINTER,
		    GTK_TYPE_BOOL, 1,
		    GTK_TYPE_GDK_EVENT);
  widget_signals[MOTION_NOTIFY_EVENT] =
    gtk_signal_new ("motion_notify_event",
		    GTK_RUN_LAST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, motion_notify_event),
		    gtk_marshal_BOOL__POINTER,
		    GTK_TYPE_BOOL, 1,
		    GTK_TYPE_GDK_EVENT);
  widget_signals[DELETE_EVENT] =
    gtk_signal_new ("delete_event",
		    GTK_RUN_LAST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, delete_event),
		    gtk_marshal_BOOL__POINTER,
		    GTK_TYPE_BOOL, 1,
		    GTK_TYPE_GDK_EVENT);
  widget_signals[DESTROY_EVENT] =
    gtk_signal_new ("destroy_event",
		    GTK_RUN_LAST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, destroy_event),
		    gtk_marshal_BOOL__POINTER,
		    GTK_TYPE_BOOL, 1,
		    GTK_TYPE_GDK_EVENT);
  widget_signals[EXPOSE_EVENT] =
    gtk_signal_new ("expose_event",
		    GTK_RUN_LAST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, expose_event),
		    gtk_marshal_BOOL__POINTER,
		    GTK_TYPE_BOOL, 1,
		    GTK_TYPE_GDK_EVENT);
  widget_signals[KEY_PRESS_EVENT] =
    gtk_signal_new ("key_press_event",
		    GTK_RUN_LAST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, key_press_event),
		    gtk_marshal_BOOL__POINTER,
		    GTK_TYPE_BOOL, 1,
		    GTK_TYPE_GDK_EVENT);
  widget_signals[KEY_RELEASE_EVENT] =
    gtk_signal_new ("key_release_event",
		    GTK_RUN_LAST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkWidgetClass, key_release_event),