gtkentry.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 <ctype.h>
#include <string.h>
#include "gdk/gdkkeysyms.h"
#include "gdk/gdki18n.h"
#include "gtkentry.h"
#include "gtkmain.h"
#include "gtkselection.h"
#include "gtksignal.h"
#include "gtkstyle.h"

#define MIN_ENTRY_WIDTH  150
#define DRAW_TIMEOUT     20
#define INNER_BORDER     2

enum {
  ARG_0,
  ARG_MAX_LENGTH,
  ARG_VISIBILITY
};


static void gtk_entry_class_init          (GtkEntryClass     *klass);
static void gtk_entry_init                (GtkEntry          *entry);
static void gtk_entry_set_arg      	  (GtkObject         *object,
					   GtkArg            *arg,
					   guint              arg_id);
static void gtk_entry_get_arg		  (GtkObject         *object,
					   GtkArg            *arg,
					   guint              arg_id);
static void gtk_entry_finalize            (GtkObject         *object);
static void gtk_entry_realize             (GtkWidget         *widget);
static void gtk_entry_unrealize           (GtkWidget         *widget);
static void gtk_entry_draw_focus          (GtkWidget         *widget);
static void gtk_entry_size_request        (GtkWidget         *widget,
					   GtkRequisition    *requisition);
static void gtk_entry_size_allocate       (GtkWidget         *widget,
					   GtkAllocation     *allocation);
static void gtk_entry_make_backing_pixmap (GtkEntry *entry,
					   gint width, gint height);
static void gtk_entry_draw                (GtkWidget         *widget,
					   GdkRectangle      *area);
static gint gtk_entry_expose              (GtkWidget         *widget,
					   GdkEventExpose    *event);
static gint gtk_entry_button_press        (GtkWidget         *widget,
					   GdkEventButton    *event);
static gint gtk_entry_button_release      (GtkWidget         *widget,
					   GdkEventButton    *event);
static gint gtk_entry_motion_notify       (GtkWidget         *widget,
					   GdkEventMotion    *event);
static gint gtk_entry_key_press           (GtkWidget         *widget,
					   GdkEventKey       *event);
static gint gtk_entry_focus_in            (GtkWidget         *widget,
					   GdkEventFocus     *event);
static gint gtk_entry_focus_out           (GtkWidget         *widget,
					   GdkEventFocus     *event);
static void gtk_entry_draw_text           (GtkEntry          *entry);
static void gtk_entry_draw_cursor         (GtkEntry          *entry);
static void gtk_entry_draw_cursor_on_drawable
					  (GtkEntry          *entry,
					   GdkDrawable       *drawable);
static void gtk_entry_style_set	          (GtkWidget         *widget,
					   GtkStyle          *previous_style);
static void gtk_entry_state_changed	  (GtkWidget         *widget,
					   GtkStateType       previous_state);
#ifdef USE_XIM
static void gtk_entry_update_ic_attr      (GtkWidget         *widget);
#endif
static void gtk_entry_queue_draw          (GtkEntry          *entry);
static gint gtk_entry_timer               (gpointer           data);
static gint gtk_entry_position            (GtkEntry          *entry,
					   gint               x);
static void entry_adjust_scroll           (GtkEntry          *entry);
static void gtk_entry_grow_text           (GtkEntry          *entry);
static void gtk_entry_insert_text         (GtkEditable       *editable,
					   const gchar       *new_text,
					   gint               new_text_length,
					   gint              *position);
static void gtk_entry_delete_text         (GtkEditable       *editable,
					   gint               start_pos,
					   gint               end_pos);
static void gtk_entry_update_text         (GtkEditable       *editable,
					   gint               start_pos,
					   gint               end_pos);
static gchar *gtk_entry_get_chars         (GtkEditable       *editable,
					   gint               start_pos,
					   gint               end_pos);

/* Binding actions */
static void gtk_entry_move_cursor         (GtkEditable *editable,
					   gint         x,
					   gint         y);
static void gtk_entry_move_word           (GtkEditable *editable,
					   gint         n);
static void gtk_entry_move_to_column      (GtkEditable *editable,
					   gint         row);
static void gtk_entry_kill_char           (GtkEditable *editable,
					   gint         direction);
static void gtk_entry_kill_word           (GtkEditable *editable,
					   gint         direction);
static void gtk_entry_kill_line           (GtkEditable *editable,
					   gint         direction);

/* To be removed */
static void gtk_move_forward_character    (GtkEntry          *entry);
static void gtk_move_backward_character   (GtkEntry          *entry);
static void gtk_move_forward_word         (GtkEntry          *entry);
static void gtk_move_backward_word        (GtkEntry          *entry);
static void gtk_move_beginning_of_line    (GtkEntry          *entry);
static void gtk_move_end_of_line          (GtkEntry          *entry);
static void gtk_delete_forward_character  (GtkEntry          *entry);
static void gtk_delete_backward_character (GtkEntry          *entry);
static void gtk_delete_forward_word       (GtkEntry          *entry);
static void gtk_delete_backward_word      (GtkEntry          *entry);
static void gtk_delete_line               (GtkEntry          *entry);
static void gtk_delete_to_line_end        (GtkEntry          *entry);
static void gtk_select_word               (GtkEntry          *entry,
					   guint32            time);
static void gtk_select_line               (GtkEntry          *entry,
					   guint32            time);


static void gtk_entry_set_selection       (GtkEditable       *editable,
					   gint               start,
					   gint               end);

static void gtk_entry_recompute_offsets   (GtkEntry          *entry);
static gint gtk_entry_find_position       (GtkEntry          *entry, 
					   gint               position);
static void gtk_entry_set_position_from_editable (GtkEditable *editable,
						  gint         position);

static GtkWidgetClass *parent_class = NULL;
static GdkAtom ctext_atom = GDK_NONE;

static const GtkTextFunction control_keys[26] =
{
  (GtkTextFunction)gtk_move_beginning_of_line,    /* a */
  (GtkTextFunction)gtk_move_backward_character,   /* b */
  (GtkTextFunction)gtk_editable_copy_clipboard,   /* c */
  (GtkTextFunction)gtk_delete_forward_character,  /* d */
  (GtkTextFunction)gtk_move_end_of_line,          /* e */
  (GtkTextFunction)gtk_move_forward_character,    /* f */
  NULL,                                           /* g */
  (GtkTextFunction)gtk_delete_backward_character, /* h */
  NULL,                                           /* i */
  NULL,                                           /* j */
  (GtkTextFunction)gtk_delete_to_line_end,        /* k */
  NULL,                                           /* l */
  NULL,                                           /* m */
  NULL,                                           /* n */
  NULL,                                           /* o */
  NULL,                                           /* p */
  NULL,                                           /* q */
  NULL,                                           /* r */
  NULL,                                           /* s */
  NULL,                                           /* t */
  (GtkTextFunction)gtk_delete_line,               /* u */
  (GtkTextFunction)gtk_editable_paste_clipboard,  /* v */
  (GtkTextFunction)gtk_delete_backward_word,      /* w */
  (GtkTextFunction)gtk_editable_cut_clipboard,    /* x */
  NULL,                                           /* y */
  NULL,                                           /* z */
};

static const GtkTextFunction alt_keys[26] =
{
  NULL,                                           /* a */
  (GtkTextFunction)gtk_move_backward_word,        /* b */
  NULL,                                           /* c */
  (GtkTextFunction)gtk_delete_forward_word,       /* d */
  NULL,                                           /* e */
  (GtkTextFunction)gtk_move_forward_word,         /* f */
  NULL,                                           /* g */
  NULL,                                           /* h */
  NULL,                                           /* i */
  NULL,                                           /* j */
  NULL,                                           /* k */
  NULL,                                           /* l */
  NULL,                                           /* m */
  NULL,                                           /* n */
  NULL,                                           /* o */
  NULL,                                           /* p */
  NULL,                                           /* q */
  NULL,                                           /* r */
  NULL,                                           /* s */
  NULL,                                           /* t */
  NULL,                                           /* u */
  NULL,                                           /* v */
  NULL,                                           /* w */
  NULL,                                           /* x */
  NULL,                                           /* y */
  NULL,                                           /* z */
};


GtkType
gtk_entry_get_type (void)
{
  static GtkType entry_type = 0;

  if (!entry_type)
    {
      static const GtkTypeInfo entry_info =
      {
	"GtkEntry",
	sizeof (GtkEntry),
	sizeof (GtkEntryClass),
	(GtkClassInitFunc) gtk_entry_class_init,
	(GtkObjectInitFunc) gtk_entry_init,
	/* reserved_1 */ NULL,
	/* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };

      entry_type = gtk_type_unique (GTK_TYPE_EDITABLE, &entry_info);
    }

  return entry_type;
}

static void
gtk_entry_class_init (GtkEntryClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkEditableClass *editable_class;

  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;
  editable_class = (GtkEditableClass*) class;
  parent_class = gtk_type_class (GTK_TYPE_EDITABLE);

  gtk_object_add_arg_type ("GtkEntry::max_length", GTK_TYPE_UINT, GTK_ARG_READWRITE, ARG_MAX_LENGTH);
  gtk_object_add_arg_type ("GtkEntry::visibility", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_VISIBILITY);

  object_class->set_arg = gtk_entry_set_arg;
  object_class->get_arg = gtk_entry_get_arg;
  object_class->finalize = gtk_entry_finalize;

  widget_class->realize = gtk_entry_realize;
  widget_class->unrealize = gtk_entry_unrealize;
  widget_class->draw_focus = gtk_entry_draw_focus;
  widget_class->size_request = gtk_entry_size_request;
  widget_class->size_allocate = gtk_entry_size_allocate;
  widget_class->draw = gtk_entry_draw;
  widget_class->expose_event = gtk_entry_expose;
  widget_class->button_press_event = gtk_entry_button_press;
  widget_class->button_release_event = gtk_entry_button_release;
  widget_class->motion_notify_event = gtk_entry_motion_notify;
  widget_class->key_press_event = gtk_entry_key_press;
  widget_class->focus_in_event = gtk_entry_focus_in;
  widget_class->focus_out_event = gtk_entry_focus_out;
  widget_class->style_set = gtk_entry_style_set;
  widget_class->state_changed = gtk_entry_state_changed;

  editable_class->insert_text = gtk_entry_insert_text;
  editable_class->delete_text = gtk_entry_delete_text;
  editable_class->changed = (void (*)(GtkEditable *)) entry_adjust_scroll;

  editable_class->move_cursor = gtk_entry_move_cursor;
  editable_class->move_word = gtk_entry_move_word;
  editable_class->move_to_column = gtk_entry_move_to_column;

  editable_class->kill_char = gtk_entry_kill_char;
  editable_class->kill_word = gtk_entry_kill_word;
  editable_class->kill_line = gtk_entry_kill_line;

  editable_class->update_text = gtk_entry_update_text;
  editable_class->get_chars   = gtk_entry_get_chars;
  editable_class->set_selection = gtk_entry_set_selection;
  editable_class->set_position = gtk_entry_set_position_from_editable;
}

static void
gtk_entry_set_arg (GtkObject      *object,
		   GtkArg         *arg,
		   guint           arg_id)
{
  GtkEntry *entry;

  entry = GTK_ENTRY (object);

  switch (arg_id)
    {
    case ARG_MAX_LENGTH:
      gtk_entry_set_max_length (entry, GTK_VALUE_UINT (*arg));
      break;
    case ARG_VISIBILITY:
      gtk_entry_set_visibility (entry, GTK_VALUE_BOOL (*arg));
      break;
    default:
      break;
    }
}

static void
gtk_entry_get_arg (GtkObject      *object,
		   GtkArg         *arg,
		   guint           arg_id)
{
  GtkEntry *entry;

  entry = GTK_ENTRY (object);

  switch (arg_id)
    {
    case ARG_MAX_LENGTH:
      GTK_VALUE_UINT (*arg) = entry->text_max_length;
      break;
    case ARG_VISIBILITY:
      GTK_VALUE_BOOL (*arg) = GTK_EDITABLE (entry)->visible;
      break;
    default:
      arg->type = GTK_TYPE_INVALID;
      break;
    }
}

static void
gtk_entry_init (GtkEntry *entry)
{
  GTK_WIDGET_SET_FLAGS (entry, GTK_CAN_FOCUS);

  entry->text_area = NULL;
  entry->backing_pixmap = NULL;
  entry->text = NULL;
  entry->text_size = 0;
  entry->text_length = 0;
  entry->text_max_length = 0;
  entry->scroll_offset = 0;
  entry->timer = 0;
  entry->button = 0;
  entry->visible = 1;

  entry->char_offset = NULL;
  entry->text_mb = NULL;
  entry->text_mb_dirty = TRUE;
  entry->use_wchar = FALSE;

  gtk_entry_grow_text (entry);
}

GtkWidget*
gtk_entry_new (void)
{
  return GTK_WIDGET (gtk_type_new (GTK_TYPE_ENTRY));
}

GtkWidget*
gtk_entry_new_with_max_length (guint16 max)
{
  GtkEntry *entry;

  entry = gtk_type_new (GTK_TYPE_ENTRY);
  entry->text_max_length = max;

  return GTK_WIDGET (entry);
}

void
gtk_entry_set_text (GtkEntry *entry,
		    const gchar *text)
{
  gint tmp_pos;

  GtkEditable *editable;

  g_return_if_fail (entry != NULL);
  g_return_if_fail (GTK_IS_ENTRY (entry));
  g_return_if_fail (text != NULL);

  editable = GTK_EDITABLE (entry);
  
  gtk_entry_delete_text (GTK_EDITABLE(entry), 0, entry->text_length);

  tmp_pos = 0;
  gtk_editable_insert_text (editable, text, strlen (text), &tmp_pos);
  editable->current_pos = tmp_pos;

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

  if (GTK_WIDGET_DRAWABLE (entry))
    gtk_entry_draw_text (entry);
}

void
gtk_entry_append_text (GtkEntry *entry,
		       const gchar *text)
{
  gint tmp_pos;

  g_return_if_fail (entry != NULL);
  g_return_if_fail (GTK_IS_ENTRY (entry));
  g_return_if_fail (text != NULL);

  tmp_pos = entry->text_length;
  gtk_editable_insert_text (GTK_EDITABLE(entry), text, strlen (text), &tmp_pos);
  GTK_EDITABLE(entry)->current_pos = tmp_pos;
}

void
gtk_entry_prepend_text (GtkEntry *entry,
			const gchar *text)
{
  gint tmp_pos;

  g_return_if_fail (entry != NULL);
  g_return_if_fail (GTK_IS_ENTRY (entry));
  g_return_if_fail (text != NULL);

  tmp_pos = 0;
  gtk_editable_insert_text (GTK_EDITABLE(entry), text, strlen (text), &tmp_pos);
  GTK_EDITABLE(entry)->current_pos = tmp_pos;
}

void
gtk_entry_set_position (GtkEntry *entry,
			gint      position)
{
  g_return_if_fail (entry != NULL);
  g_return_if_fail (GTK_IS_ENTRY (entry));

  if ((position == -1) || (position > entry->text_length))
    GTK_EDITABLE(entry)->current_pos = entry->text_length;
  else
    GTK_EDITABLE(entry)->current_pos = position;
  entry_adjust_scroll (entry);
}

static void
gtk_entry_set_position_from_editable (GtkEditable *editable,
				      gint position)
{
  gtk_entry_set_position (GTK_ENTRY (editable), position);
}