gtktext.c

gtk是linux一款强大的夸平台的图形化开发工具

	    }

	  attrmask |= GDK_IC_PREEDIT_POSITION_REQ;
	  gdk_window_get_size (text->text_area, &width, &height);
	  attr->spot_location.x = 0;
	  attr->spot_location.y = height;
	  attr->preedit_area.x = 0;
	  attr->preedit_area.y = 0;
	  attr->preedit_area.width = width;
	  attr->preedit_area.height = height;
	  attr->preedit_fontset = widget->style->font;
	  
	  break;
	}
      editable->ic = gdk_ic_new (attr, attrmask);
      
      if (editable->ic == NULL)
	g_warning ("Can't create input context.");
      else
	{
	  mask = gdk_window_get_events (text->text_area);
	  mask |= gdk_ic_get_events (editable->ic);
	  gdk_window_set_events (text->text_area, mask);
	  
	  if (GTK_WIDGET_HAS_FOCUS (widget))
	    gdk_im_begin (editable->ic, text->text_area);
	}
    }
#endif

  realize_properties (text);
  gdk_window_show (text->text_area);
  init_properties (text);

  if (editable->selection_start_pos != editable->selection_end_pos)
    gtk_editable_claim_selection (editable, TRUE, GDK_CURRENT_TIME);
  
  recompute_geometry (text);
}

static void 
gtk_text_style_set	(GtkWidget      *widget,
			 GtkStyle       *previous_style)
{
  GtkText *text;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_TEXT (widget));
  
  text = GTK_TEXT (widget);
  if (GTK_WIDGET_REALIZED (widget))
    {
      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 (text->bg_gc)
	{
	  gdk_gc_destroy (text->bg_gc);
	  text->bg_gc = NULL;
	}

      if (widget->style->bg_pixmap[GTK_STATE_NORMAL])
	text->bg_gc = create_bg_gc (text);

      recompute_geometry (text);
    }

  if (text->current_font)
    text_font_unref (text->current_font);
  text->current_font = get_text_font (widget->style->font);
}

static void
gtk_text_unrealize (GtkWidget *widget)
{
  GtkText *text;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_TEXT (widget));
  
  text = GTK_TEXT (widget);

#ifdef USE_XIM
  if (GTK_EDITABLE (widget)->ic)
    {
      gdk_ic_destroy (GTK_EDITABLE (widget)->ic);
      GTK_EDITABLE (widget)->ic = NULL;
    }
  if (GTK_EDITABLE (widget)->ic_attr)
    {
      gdk_ic_attr_destroy (GTK_EDITABLE (widget)->ic_attr);
      GTK_EDITABLE (widget)->ic_attr = NULL;
    }
#endif

  gdk_window_set_user_data (text->text_area, NULL);
  gdk_window_destroy (text->text_area);
  text->text_area = NULL;
  
  gdk_gc_destroy (text->gc);
  text->gc = NULL;

  if (text->bg_gc)
    {
      gdk_gc_destroy (text->bg_gc);
      text->bg_gc = NULL;
    }
  
  gdk_pixmap_unref (text->line_wrap_bitmap);
  gdk_pixmap_unref (text->line_arrow_bitmap);

  unrealize_properties (text);

  free_cache (text);

  if (GTK_WIDGET_CLASS (parent_class)->unrealize)
    (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}

static void
clear_focus_area (GtkText *text, gint area_x, gint area_y, gint area_width, gint area_height)
{
  GtkWidget *widget = GTK_WIDGET (text);
  
  gint ythick = TEXT_BORDER_ROOM + widget->style->klass->ythickness;
  gint xthick = TEXT_BORDER_ROOM + widget->style->klass->xthickness;
  
  gint width, height;
  
  gdk_window_get_size (widget->style->bg_pixmap[GTK_STATE_NORMAL], &width, &height);
  
  gdk_gc_set_ts_origin (text->bg_gc,
			(- (gint)text->first_onscreen_hor_pixel + xthick) % width,
			(- (gint)text->first_onscreen_ver_pixel + ythick) % height);


  gdk_draw_rectangle (GTK_WIDGET (text)->window, text->bg_gc, TRUE,
		      area_x, area_y, area_width, area_height);
}

static void
gtk_text_draw_focus (GtkWidget *widget)
{
  GtkText *text;
  gint width, height;
  gint x, y;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_TEXT (widget));
  
  text = GTK_TEXT (widget);
  
  if (GTK_WIDGET_DRAWABLE (widget))
    {
      gint ythick = widget->style->klass->ythickness;
      gint xthick = widget->style->klass->xthickness;
      gint xextra = TEXT_BORDER_ROOM;
      gint yextra = TEXT_BORDER_ROOM;
      
      TDEBUG (("in gtk_text_draw_focus\n"));
      
      x = 0;
      y = 0;
      width = widget->allocation.width;
      height = widget->allocation.height;
      
      if (GTK_WIDGET_HAS_FOCUS (widget))
	{
	  x += 1;
	  y += 1;
	  width -=  2;
	  height -= 2;
	  xextra -= 1;
	  yextra -= 1;

	  gtk_paint_focus (widget->style, widget->window,
			   NULL, widget, "text",
			   0, 0,
			   widget->allocation.width - 1,
			   widget->allocation.height - 1);
	}

      gtk_paint_shadow (widget->style, widget->window,
			GTK_STATE_NORMAL, GTK_SHADOW_IN,
			NULL, widget, "text",
			x, y, width, height);

      x += xthick; 
      y += ythick;
      width -= 2 * xthick;
      height -= 2 * ythick;
      
      if (widget->style->bg_pixmap[GTK_STATE_NORMAL])
	{
	  /* top rect */
	  clear_focus_area (text, x, y, width, yextra);
	  /* left rect */
	  clear_focus_area (text, x, y + yextra, 
			    xextra, y + height - 2 * yextra);
	  /* right rect */
	  clear_focus_area (text, x + width - xextra, y + yextra, 
			    xextra, height - 2 * ythick);
	  /* bottom rect */
	  clear_focus_area (text, x, x + height - yextra, width, yextra);
	}
    }
  else
    {
      TDEBUG (("in gtk_text_draw_focus (undrawable !!!)\n"));
    }
}

static void
gtk_text_size_request (GtkWidget      *widget,
		       GtkRequisition *requisition)
{
  gint xthickness;
  gint ythickness;
  gint char_height;
  gint char_width;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_TEXT (widget));
  g_return_if_fail (requisition != NULL);
  
  xthickness = widget->style->klass->xthickness + TEXT_BORDER_ROOM;
  ythickness = widget->style->klass->ythickness + TEXT_BORDER_ROOM;
  
  char_height = MIN_TEXT_HEIGHT_LINES * (widget->style->font->ascent +
					 widget->style->font->descent);
  
  char_width = MIN_TEXT_WIDTH_LINES * (gdk_text_width (widget->style->font,
						       "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
						       26)
				       / 26);
  
  requisition->width  = char_width  + xthickness * 2;
  requisition->height = char_height + ythickness * 2;
}

static void
gtk_text_size_allocate (GtkWidget     *widget,
			GtkAllocation *allocation)
{
  GtkText *text;
  GtkEditable *editable;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_TEXT (widget));
  g_return_if_fail (allocation != NULL);
  
  text = GTK_TEXT (widget);
  editable = GTK_EDITABLE (widget);
  
  widget->allocation = *allocation;
  if (GTK_WIDGET_REALIZED (widget))
    {
      gdk_window_move_resize (widget->window,
			      allocation->x, allocation->y,
			      allocation->width, allocation->height);
      
      gdk_window_move_resize (text->text_area,
			      widget->style->klass->xthickness + TEXT_BORDER_ROOM,
			      widget->style->klass->ythickness + TEXT_BORDER_ROOM,
			      MAX (1, (gint)widget->allocation.width - (gint)(widget->style->klass->xthickness +
							  (gint)TEXT_BORDER_ROOM) * 2),
			      MAX (1, (gint)widget->allocation.height - (gint)(widget->style->klass->ythickness +
							   (gint)TEXT_BORDER_ROOM) * 2));
      
#ifdef USE_XIM
      if (editable->ic && (gdk_ic_get_style (editable->ic) & GDK_IM_PREEDIT_POSITION))
	{
	  gint width, height;
	  
	  gdk_window_get_size (text->text_area, &width, &height);
	  editable->ic_attr->preedit_area.width = width;
	  editable->ic_attr->preedit_area.height = height;

	  gdk_ic_set_attr (editable->ic,
	      		   editable->ic_attr, GDK_IC_PREEDIT_AREA);
	}
#endif
      
      recompute_geometry (text);
    }
}

static void
gtk_text_draw (GtkWidget    *widget,
	       GdkRectangle *area)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_TEXT (widget));
  g_return_if_fail (area != NULL);
  
  if (GTK_WIDGET_DRAWABLE (widget))
    {
      expose_text (GTK_TEXT (widget), area, TRUE);
      gtk_widget_draw_focus (widget);
    }
}

static gint
gtk_text_expose (GtkWidget      *widget,
		 GdkEventExpose *event)
{
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_TEXT (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);
  
  if (event->window == GTK_TEXT (widget)->text_area)
    {
      TDEBUG (("in gtk_text_expose (expose)\n"));
      expose_text (GTK_TEXT (widget), &event->area, TRUE);
    }
  else if (event->count == 0)
    {
      TDEBUG (("in gtk_text_expose (focus)\n"));
      gtk_widget_draw_focus (widget);
    }
  
  return FALSE;
}

static gint
gtk_text_scroll_timeout (gpointer data)
{
  GtkText *text;
  GdkEventMotion event;
  gint x, y;
  GdkModifierType mask;
  
  GDK_THREADS_ENTER ();

  text = GTK_TEXT (data);
  
  text->timer = 0;
  gdk_window_get_pointer (text->text_area, &x, &y, &mask);
  
  if (mask & (GDK_BUTTON1_MASK | GDK_BUTTON3_MASK))
    {
      event.is_hint = 0;
      event.x = x;
      event.y = y;
      event.state = mask;
      
      gtk_text_motion_notify (GTK_WIDGET (text), &event);
    }

  GDK_THREADS_LEAVE ();
  
  return FALSE;
}

static gint
gtk_text_button_press (GtkWidget      *widget,
		       GdkEventButton *event)
{
  GtkText *text;
  GtkEditable *editable;
  static GdkAtom ctext_atom = GDK_NONE;
  
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_TEXT (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);
  
  if (ctext_atom == GDK_NONE)
    ctext_atom = gdk_atom_intern ("COMPOUND_TEXT", FALSE);
  
  text = GTK_TEXT (widget);
  editable = GTK_EDITABLE (widget);
  
  if (text->button && (event->button != text->button))
    return FALSE;
  
  text->button = event->button;
  
  if (!GTK_WIDGET_HAS_FOCUS (widget))
    gtk_widget_grab_focus (widget);
  
  if (event->button == 1)
    {
      switch (event->type)
	{
	case GDK_BUTTON_PRESS:
	  gtk_grab_add (widget);
	  
	  undraw_cursor (text, FALSE);
	  find_mouse_cursor (text, (gint)event->x, (gint)event->y);
	  draw_cursor (text, FALSE);
	  
	  /* Set it now, so we display things right. We'll unset it
	   * later if things don't work out */
	  editable->has_selection = TRUE;
	  gtk_text_set_selection (GTK_EDITABLE(text),
				  text->cursor_mark.index,
				  text->cursor_mark.index);
	  
	  break;
	  
	case GDK_2BUTTON_PRESS:
	  gtk_text_select_word (text, event->time);
	  break;
	  
	case GDK_3BUTTON_PRESS:
	  gtk_text_select_line (text, event->time);
	  break;
	  
	default:
	  break;
	}
    }
  else if (event->type == GDK_BUTTON_PRESS)
    {
      if ((event->button == 2) && editable->editable)
	{
	  if (editable->selection_start_pos == editable->selection_end_pos ||
	      editable->has_selection)
	    {
	      undraw_cursor (text, FALSE);
	      find_mouse_cursor (text, (gint)event->x, (gint)event->y);
	      draw_cursor (text, FALSE);
	      
	    }
	  
	  gtk_selection_convert (widget, GDK_SELECTION_PRIMARY,
				 ctext_atom, event->time);
	}
      else
	{
	  gtk_grab_add (widget);
	  
	  undraw_cursor (text, FALSE);
	  find_mouse_cursor (text, event->x, event->y);
	  draw_cursor (text, FALSE);
	  
	  gtk_text_set_selection (GTK_EDITABLE(text),
				  text->cursor_mark.index,
				  text->cursor_mark.index);
	  
	  editable->has_selection = FALSE;
	  if (gdk_selection_owner_get (GDK_SELECTION_PRIMARY) == widget->window)
	    gtk_selection_owner_set (NULL, GDK_SELECTION_PRIMARY, event->time);
	}
    }
  
  return FALSE;
}

static gint
gtk_text_button_release (GtkWidget      *widget,
			 GdkEventButton *event)
{
  GtkText *text;
  GtkEditable *editable;
  g_return_val_if_fail (widget != NULL, FALSE);