gtktext.c

gtk是linux一款强大的夸平台的图形化开发工具

  
  if (text->freeze_count)
    if (!(--text->freeze_count) && GTK_WIDGET_REALIZED (text))
      {
	recompute_geometry (text);
	gtk_widget_queue_draw (GTK_WIDGET (text));
      }
}

void
gtk_text_insert (GtkText    *text,
		 GdkFont    *font,
		 GdkColor   *fore,
		 GdkColor   *back,
		 const char *chars,
		 gint        nchars)
{
  GtkEditable *editable = GTK_EDITABLE (text);
  gboolean frozen = FALSE;
  
  gint new_line_count = 1;
  guint old_height = 0;
  guint length;
  guint i;
  gint numwcs;
  
  g_return_if_fail (text != NULL);
  g_return_if_fail (GTK_IS_TEXT (text));
  if (nchars > 0)
    g_return_if_fail (chars != NULL);
  else
    {
      if (!nchars || !chars)
	return;
      nchars = strlen (chars);
    }
  length = nchars;
  
  if (!text->freeze_count && (length > FREEZE_LENGTH))
    {
      gtk_text_freeze (text);
      frozen = TRUE;
    }
  
  if (!text->freeze_count && (text->line_start_cache != NULL))
    {
      find_line_containing_point (text, text->point.index, TRUE);
      old_height = total_line_height (text, text->current_line, 1);
    }
  
  if ((TEXT_LENGTH (text) == 0) && (text->use_wchar == FALSE))
    {
      GtkWidget *widget;
      widget = GTK_WIDGET (text);
      gtk_widget_ensure_style (widget);
      if ((widget->style) && (widget->style->font->type == GDK_FONT_FONTSET))
 	{
 	  text->use_wchar = TRUE;
 	  g_free (text->text.ch);
 	  text->text.wc = g_new (GdkWChar, INITIAL_BUFFER_SIZE);
 	  text->text_len = INITIAL_BUFFER_SIZE;
 	  if (text->scratch_buffer.ch)
 	    g_free (text->scratch_buffer.ch);
 	  text->scratch_buffer.wc = NULL;
 	  text->scratch_buffer_len = 0;
 	}
    }
 
  move_gap (text, text->point.index);
  make_forward_space (text, length);
 
  if (text->use_wchar)
    {
      char *chars_nt = (char *)chars;
      if (nchars > 0)
	{
	  chars_nt = g_new (char, length+1);
	  memcpy (chars_nt, chars, length);
	  chars_nt[length] = 0;
	}
      numwcs = gdk_mbstowcs (text->text.wc + text->gap_position, chars_nt,
 			     length);
      if (chars_nt != chars)
	g_free(chars_nt);
      if (numwcs < 0)
	numwcs = 0;
    }
  else
    {
      numwcs = length;
      memcpy(text->text.ch + text->gap_position, chars, length);
    }
 
  if (!text->freeze_count && (text->line_start_cache != NULL))
    {
      if (text->use_wchar)
 	{
 	  for (i=0; i<numwcs; i++)
 	    if (text->text.wc[text->gap_position + i] == '\n')
 	      new_line_count++;
	}
      else
 	{
 	  for (i=0; i<numwcs; i++)
 	    if (text->text.ch[text->gap_position + i] == '\n')
 	      new_line_count++;
 	}
    }
 
  if (numwcs > 0)
    {
      insert_text_property (text, font, fore, back, numwcs);
   
      text->gap_size -= numwcs;
      text->gap_position += numwcs;
   
      if (text->point.index < text->first_line_start_index)
 	text->first_line_start_index += numwcs;
      if (text->point.index < editable->selection_start_pos)
 	editable->selection_start_pos += numwcs;
      if (text->point.index < editable->selection_end_pos)
 	editable->selection_end_pos += numwcs;
      /* We'll reset the cursor later anyways if we aren't frozen */
      if (text->point.index < text->cursor_mark.index)
 	text->cursor_mark.index += numwcs;
  
      advance_mark_n (&text->point, numwcs);
  
      if (!text->freeze_count && (text->line_start_cache != NULL))
	insert_expose (text, old_height, numwcs, new_line_count);
    }

  if (frozen)
    gtk_text_thaw (text);
}

gint
gtk_text_backward_delete (GtkText *text,
			  guint    nchars)
{
  g_return_val_if_fail (text != NULL, 0);
  g_return_val_if_fail (GTK_IS_TEXT (text), 0);
  
  if (nchars > text->point.index || nchars <= 0)
    return FALSE;
  
  gtk_text_set_point (text, text->point.index - nchars);
  
  return gtk_text_forward_delete (text, nchars);
}

gint
gtk_text_forward_delete (GtkText *text,
			 guint    nchars)
{
  guint old_lines, old_height;
  GtkEditable *editable = GTK_EDITABLE (text);
  gboolean frozen = FALSE;
  
  g_return_val_if_fail (text != NULL, 0);
  g_return_val_if_fail (GTK_IS_TEXT (text), 0);
  
  if (text->point.index + nchars > TEXT_LENGTH (text) || nchars <= 0)
    return FALSE;
  
  if (!text->freeze_count && nchars > FREEZE_LENGTH)
    {
      gtk_text_freeze (text);
      frozen = TRUE;
    }
  
  if (!text->freeze_count && text->line_start_cache != NULL)
    {
      /* We need to undraw the cursor here, since we may later
       * delete the cursor's property
       */
      undraw_cursor (text, FALSE);
      find_line_containing_point (text, text->point.index, TRUE);
      compute_lines_pixels (text, nchars, &old_lines, &old_height);
    }
  
  /* FIXME, or resizing after deleting will be odd */
  if (text->point.index < text->first_line_start_index)
    {
      if (text->point.index + nchars >= text->first_line_start_index)
	{
	  text->first_line_start_index = text->point.index;
	  while ((text->first_line_start_index > 0) &&
		 (GTK_TEXT_INDEX (text, text->first_line_start_index - 1)
		  != LINE_DELIM))
	    text->first_line_start_index -= 1;
	  
	}
      else
	text->first_line_start_index -= nchars;
    }
  
  if (text->point.index < editable->selection_start_pos)
    editable->selection_start_pos -= 
      MIN(nchars, editable->selection_start_pos - text->point.index);
  if (text->point.index < editable->selection_end_pos)
    editable->selection_end_pos -= 
      MIN(nchars, editable->selection_end_pos - text->point.index);
  /* We'll reset the cursor later anyways if we aren't frozen */
  if (text->point.index < text->cursor_mark.index)
    move_mark_n (&text->cursor_mark, 
		 -MIN(nchars, text->cursor_mark.index - text->point.index));
  
  move_gap (text, text->point.index);
  
  text->gap_size += nchars;
  
  delete_text_property (text, nchars);
  
  if (!text->freeze_count && (text->line_start_cache != NULL))
    {
      delete_expose (text, nchars, old_lines, old_height);
      draw_cursor (text, FALSE);
    }
  
  if (frozen)
    gtk_text_thaw (text);
  
  return TRUE;
}

static void
gtk_text_set_position (GtkEditable *editable,
		       gint position)
{
  GtkText *text = (GtkText *) editable;
  
  undraw_cursor (text, FALSE);
  text->cursor_mark = find_mark (text, position);
  find_cursor (text, TRUE);
  draw_cursor (text, FALSE);
  gtk_editable_select_region (editable, 0, 0);
}

static gchar *    
gtk_text_get_chars (GtkEditable   *editable,
		    gint           start_pos,
		    gint           end_pos)
{
  GtkText *text;

  gchar *retval;
  
  g_return_val_if_fail (editable != NULL, NULL);
  g_return_val_if_fail (GTK_IS_TEXT (editable), NULL);
  text = GTK_TEXT (editable);
  
  if (end_pos < 0)
    end_pos = TEXT_LENGTH (text);
  
  if ((start_pos < 0) || 
      (end_pos > TEXT_LENGTH (text)) || 
      (end_pos < start_pos))
    return NULL;
  
  move_gap (text, TEXT_LENGTH (text));
  make_forward_space (text, 1);

  if (text->use_wchar)
    {
      GdkWChar ch;
      ch = text->text.wc[end_pos];
      text->text.wc[end_pos] = 0;
      retval = gdk_wcstombs (text->text.wc + start_pos);
      text->text.wc[end_pos] = ch;
    }
  else
    {
      guchar ch;
      ch = text->text.ch[end_pos];
      text->text.ch[end_pos] = 0;
      retval = g_strdup (text->text.ch + start_pos);
      text->text.ch[end_pos] = ch;
    }

  return retval;
}


static void
gtk_text_destroy (GtkObject *object)
{
  GtkText *text;
  
  g_return_if_fail (object != NULL);
  g_return_if_fail (GTK_IS_TEXT (object));
  
  text = (GtkText*) object;

  gtk_signal_disconnect_by_data (GTK_OBJECT (text->hadj), text);
  gtk_signal_disconnect_by_data (GTK_OBJECT (text->vadj), text);

  if (text->timer)
    {
      gtk_timeout_remove (text->timer);
      text->timer = 0;
    }
  
  GTK_OBJECT_CLASS(parent_class)->destroy (object);
}

static void
gtk_text_finalize (GtkObject *object)
{
  GtkText *text;
  GList *tmp_list;
  
  g_return_if_fail (object != NULL);
  g_return_if_fail (GTK_IS_TEXT (object));
  
  text = (GtkText *)object;
  
  gtk_object_unref (GTK_OBJECT (text->hadj));
  gtk_object_unref (GTK_OBJECT (text->vadj));

  /* Clean up the internal structures */
  if (text->use_wchar)
    g_free (text->text.wc);
  else
    g_free (text->text.ch);
  
  tmp_list = text->text_properties;
  while (tmp_list)
    {
      destroy_text_property (tmp_list->data);
      tmp_list = tmp_list->next;
    }

  if (text->current_font)
    text_font_unref (text->current_font);
  
  g_list_free (text->text_properties);
  
  if (text->use_wchar)
    {
      if (text->scratch_buffer.wc)
	g_free (text->scratch_buffer.wc);
    }
  else
    {
      if (text->scratch_buffer.ch)
	g_free (text->scratch_buffer.ch);
    }
  
  g_list_free (text->tab_stops);
  
  GTK_OBJECT_CLASS(parent_class)->finalize (object);
}

static void
gtk_text_realize (GtkWidget *widget)
{
  GtkText *text;
  GtkEditable *editable;
  GdkWindowAttr attributes;
  gint attributes_mask;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_TEXT (widget));
  
  text = GTK_TEXT (widget);
  editable = GTK_EDITABLE (widget);
  GTK_WIDGET_SET_FLAGS (text, GTK_REALIZED);
  
  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = widget->allocation.x;
  attributes.y = widget->allocation.y;
  attributes.width = widget->allocation.width;
  attributes.height = widget->allocation.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
  attributes.event_mask = gtk_widget_get_events (widget);
  attributes.event_mask |= (GDK_EXPOSURE_MASK |
			    GDK_BUTTON_PRESS_MASK |
			    GDK_BUTTON_RELEASE_MASK |
			    GDK_BUTTON_MOTION_MASK |
			    GDK_ENTER_NOTIFY_MASK |
			    GDK_LEAVE_NOTIFY_MASK |
			    GDK_KEY_PRESS_MASK);
  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
  
  widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
  gdk_window_set_user_data (widget->window, text);
  
  attributes.x = (widget->style->klass->xthickness + TEXT_BORDER_ROOM);
  attributes.y = (widget->style->klass->ythickness + TEXT_BORDER_ROOM);
  attributes.width = MAX (1, (gint)widget->allocation.width - (gint)attributes.x * 2);
  attributes.height = MAX (1, (gint)widget->allocation.height - (gint)attributes.y * 2);
  
  text->text_area = gdk_window_new (widget->window, &attributes, attributes_mask);
  gdk_window_set_user_data (text->text_area, text);
  
  widget->style = gtk_style_attach (widget->style, widget->window);
  
  /* Can't call gtk_style_set_background here because it's handled specially */
  gdk_window_set_background (widget->window, &widget->style->base[GTK_STATE_NORMAL]);
  gdk_window_set_background (text->text_area, &widget->style->base[GTK_STATE_NORMAL]);

  if (widget->style->bg_pixmap[GTK_STATE_NORMAL])
    text->bg_gc = create_bg_gc (text);
  
  text->line_wrap_bitmap = gdk_bitmap_create_from_data (text->text_area,
							(gchar*) line_wrap_bits,
							line_wrap_width,
							line_wrap_height);
  
  text->line_arrow_bitmap = gdk_bitmap_create_from_data (text->text_area,
							 (gchar*) line_arrow_bits,
							 line_arrow_width,
							 line_arrow_height);
  
  text->gc = gdk_gc_new (text->text_area);
  gdk_gc_set_exposures (text->gc, TRUE);
  gdk_gc_set_foreground (text->gc, &widget->style->text[GTK_STATE_NORMAL]);
  
#ifdef USE_XIM
  if (gdk_im_ready () && (editable->ic_attr = gdk_ic_attr_new ()) != NULL)
    {
      gint width, height;
      GdkColormap *colormap;
      GdkEventMask mask;
      GdkICAttr *attr = editable->ic_attr;
      GdkICAttributesType attrmask = GDK_IC_ALL_REQ;
      GdkIMStyle style;
      GdkIMStyle supported_style = GDK_IM_PREEDIT_NONE | 
	                           GDK_IM_PREEDIT_NOTHING |
	                           GDK_IM_PREEDIT_POSITION |
	                           GDK_IM_STATUS_NONE |
	                           GDK_IM_STATUS_NOTHING;
      
      if (widget->style && widget->style->font->type != GDK_FONT_FONTSET)
	supported_style &= ~GDK_IM_PREEDIT_POSITION;
      
      attr->style = style = gdk_im_decide_style (supported_style);
      attr->client_window = text->text_area;

      if ((colormap = gtk_widget_get_colormap (widget)) !=
	  gtk_widget_get_default_colormap ())
	{
	  attrmask |= GDK_IC_PREEDIT_COLORMAP;
	  attr->preedit_colormap = colormap;
	}

      switch (style & GDK_IM_PREEDIT_MASK)
	{
	case GDK_IM_PREEDIT_POSITION:
	  if (widget->style && widget->style->font->type != GDK_FONT_FONTSET)
	    {
	      g_warning ("over-the-spot style requires fontset");
	      break;