atk/atkimage.c

   1 /* ATK -  Accessibility Toolkit
   2  * Copyright 2001 Sun Microsystems Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "atkimage.h"
  21
  22 GType
  23 atk_image_get_type (void)
  24 {
  25   static GType type = 0;
  26
  27   if (!type) {
  28     static const GTypeInfo tinfo =
  29     {
  30       sizeof (AtkImageIface),
  31       (GBaseInitFunc) NULL,
  32       (GBaseFinalizeFunc) NULL
  33     };
  34
  35     type = g_type_register_static (G_TYPE_INTERFACE, "AtkImage", &tinfo, 0);
  36   }
  37
  38   return type;
  39 }
  40
  41 /**
  42  * atk_image_get_image_description:
  43  * @image: a #GObject instance that implements AtkImageIface
  44  *
  45  * Get a textual description of this image.
  46  *
  47  * Returns: a string representing the image description
  48  **/
  49 G_CONST_RETURN gchar*
  50 atk_image_get_image_description (AtkImage *image)
  51 {
  52   AtkImageIface *iface;
  53
  54   g_return_val_if_fail (ATK_IS_IMAGE (image), NULL);
  55
  56   iface = ATK_IMAGE_GET_IFACE (image);
  57
  58   if (iface->get_image_description)
  59     {
  60       return (iface->get_image_description) (image);
  61     }
  62   else
  63     {
  64       return NULL;
  65     }
  66 }
  67
  68 /**
  69  * atk_image_get_image_size:
  70  * @image: a #GObject instance that implements AtkImageIface
  71  * @width: filled with the image width
  72  * @height: filled with the image height
  73  *
  74  * Get the width and height in pixels for the specified image.
  75  * The values of @width and @height are returned as -1 if the
  76  * values cannot be obtained.
  77  **/
  78 void
  79 atk_image_get_image_size (AtkImage *image,
  80                           int      *width,
  81                           int      *height)
  82 {
  83   AtkImageIface *iface;
  84   gint local_width, local_height;
  85   gint *real_width, *real_height;
  86
  87   g_return_if_fail (ATK_IS_IMAGE (image));
  88
  89   if (width)
  90     real_width = width;
  91   else
  92     real_width = &local_width;
  93   if (height)
  94     real_height = height;
  95   else
  96     real_height = &local_height;
  97
  98   iface = ATK_IMAGE_GET_IFACE (image);
  99
 100   if (iface->get_image_size)
 101   {
 102     iface->get_image_size (image, real_width, real_height);
 103   }
 104   else
 105   {
 106     *width = -1;
 107     *height = -1;
 108   }
 109 }
 110
 111 /**
 112  * atk_image_set_image_description:
 113  * @image: a #GObject instance that implements AtkImageIface
 114  * @description: a string description to set for @image
 115  *
 116  * Sets the textual description for this image.
 117  *
 118  * Returns: boolean TRUE, or FALSE if operation could
 119  * not be completed.
 120  **/
 121 gboolean
 122 atk_image_set_image_description (AtkImage        *image,
 123                                  const gchar     *description)
 124 {
 125   AtkImageIface *iface;
 126
 127   g_return_val_if_fail (ATK_IS_IMAGE (image), FALSE);
 128
 129   iface = ATK_IMAGE_GET_IFACE (image);
 130
 131   if (iface->set_image_description)
 132     {
 133       return (iface->set_image_description) (image, description);
 134     }
 135   else
 136     {
 137       return FALSE;
 138     }
 139 }
 140
 141 /**
 142  * atk_image_get_image_position:
 143  * @image: a #GObject instance that implements AtkImageIface
 144  * @x: address of #gint to put x coordinate position
 145  * @y: address of #gint to put y coordinate position
 146  * @coord_type: specifies whether the coordinates are relative to the screen
 147  * or to the components top level window
 148  *
 149  * Gets the position of the image in the form of a point specifying the
 150  * images top-left corner.  The values of @x and @y are returned as -1
 151  * if the values cannot be obtained.
 152  **/
 153 void
 154 atk_image_get_image_position (AtkImage *image,
 155                         gint *x,
 156                         gint *y,
 157                         AtkCoordType coord_type)
 158 {
 159   AtkImageIface *iface;
 160   gint local_x, local_y;
 161   gint *real_x, *real_y;
 162
 163   g_return_if_fail (ATK_IS_IMAGE (image));
 164
 165   if (x)
 166     real_x = x;
 167   else
 168     real_x = &local_x;
 169   if (y)
 170     real_y = y;
 171   else
 172     real_y = &local_y;
 173
 174   iface = ATK_IMAGE_GET_IFACE (image);
 175
 176   g_return_if_fail (ATK_IS_IMAGE (image));
 177
 178   iface = ATK_IMAGE_GET_IFACE (image);
 179
 180   if (iface->get_image_position)
 181   {
 182     (iface->get_image_position) (image, real_x, real_y, coord_type);
 183   }
 184   else
 185   {
 186     *x = -1;
 187     *y = -1;
 188   }
 189 }