git.sur5r.net Git - glabels/blob - src/color-history-model.c

   1 /*
   2  *  color-history-model.c
   3  *  Copyright (C) 2008-2009  Jim Evins <evins@snaught.com>.
   4  *
   5  *  This file is part of gLabels.
   6  *
   7  *  gLabels is free software: you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation, either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  gLabels is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with gLabels.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22
  23 #include "color-history-model.h"
  24
  25 #include <gconf/gconf-client.h>
  26
  27 #include "marshal.h"
  28
  29
  30 #define BASE_KEY          "/apps/glabels"
  31 #define RECENT_COLORS_KEY  BASE_KEY "/recent-colors"
  32
  33
  34 /*========================================================*/
  35 /* Private types.                                         */
  36 /*========================================================*/
  37
  38 /** GL_COLOR_HISTORY_MODEL Private fields */
  39 struct _glColorHistoryModelPrivate {
  40
  41         GConfClient *gconf_client;
  42
  43         guint        max_n;
  44 };
  45
  46 enum {
  47         CHANGED,
  48         LAST_SIGNAL
  49 };
  50
  51
  52 /*========================================================*/
  53 /* Private globals.                                       */
  54 /*========================================================*/
  55
  56 static guint signals[LAST_SIGNAL] = {0};
  57
  58
  59 /*========================================================*/
  60 /* Private function prototypes.                           */
  61 /*========================================================*/
  62
  63 static void gl_color_history_model_finalize     (GObject             *object);
  64
  65 static void conf_notify_cb                      (GConfClient         *client,
  66                                                  guint                cnxn_id,
  67                                                  GConfEntry          *entry,
  68                                                  glColorHistoryModel *this);
  69
  70 static GSList *get_color_list                   (glColorHistoryModel *this);
  71
  72
  73 /*****************************************************************************/
  74 /* Object infrastructure.                                                    */
  75 /*****************************************************************************/
  76 G_DEFINE_TYPE (glColorHistoryModel, gl_color_history_model, G_TYPE_OBJECT);
  77
  78
  79 /*****************************************************************************/
  80 /* Class Init Function.                                                      */
  81 /*****************************************************************************/
  82 static void
  83 gl_color_history_model_class_init (glColorHistoryModelClass *class)
  84 {
  85         GObjectClass  *gobject_class = (GObjectClass *) class;
  86
  87         gl_color_history_model_parent_class = g_type_class_peek_parent (class);
  88
  89         gobject_class->finalize = gl_color_history_model_finalize;
  90
  91         signals[CHANGED] =
  92                 g_signal_new ("changed",
  93                               G_OBJECT_CLASS_TYPE (gobject_class),
  94                               G_SIGNAL_RUN_LAST,
  95                               G_STRUCT_OFFSET (glColorHistoryModelClass, changed),
  96                               NULL, NULL,
  97                               gl_marshal_VOID__VOID,
  98                               G_TYPE_NONE,
  99                               0);
 100 }
 101
 102
 103 /*****************************************************************************/
 104 /* Object Instance Init Function.                                            */
 105 /*****************************************************************************/
 106 static void
 107 gl_color_history_model_init (glColorHistoryModel *this)
 108 {
 109         this->priv = g_new0 (glColorHistoryModelPrivate, 1);
 110
 111         this->priv->gconf_client = gconf_client_get_default ();
 112
 113         g_return_if_fail (this->priv->gconf_client != NULL);
 114
 115         gconf_client_add_dir (this->priv->gconf_client,
 116                               BASE_KEY,
 117                               GCONF_CLIENT_PRELOAD_ONELEVEL,
 118                               NULL);
 119
 120         gconf_client_notify_add (this->priv->gconf_client,
 121                                  RECENT_COLORS_KEY,
 122                                  (GConfClientNotifyFunc)conf_notify_cb, this,
 123                                  NULL, NULL);
 124 }
 125
 126
 127 /*****************************************************************************/
 128 /* Finalize Method.                                                          */
 129 /*****************************************************************************/
 130 static void
 131 gl_color_history_model_finalize (GObject *object)
 132 {
 133         glColorHistoryModel   *this;
 134
 135         g_return_if_fail (object && IS_GL_COLOR_HISTORY_MODEL (object));
 136         this = GL_COLOR_HISTORY_MODEL (object);
 137
 138         g_object_unref (G_OBJECT(this->priv->gconf_client));
 139         g_free (this->priv);
 140
 141         G_OBJECT_CLASS (gl_color_history_model_parent_class)->finalize (object);
 142 }
 143
 144
 145 /*****************************************************************************/
 146 /** New Object Generator.                                                    */
 147 /*****************************************************************************/
 148 glColorHistoryModel *
 149 gl_color_history_model_new (guint n)
 150 {
 151         glColorHistoryModel *this;
 152
 153         this = g_object_new (TYPE_GL_COLOR_HISTORY_MODEL, NULL);
 154
 155         this->priv->max_n = n;
 156
 157         return this;
 158 }
 159
 160
 161 /*****************************************************************************/
 162 /* Add color to history.                                                      */
 163 /*****************************************************************************/
 164 void
 165 gl_color_history_model_add_color (glColorHistoryModel *this,
 166                                   guint                color)
 167 {
 168         GSList  *list = NULL;
 169         GSList  *old_list;
 170         GSList  *p;
 171
 172         /*
 173          * Start new list with this color.
 174          */
 175         list = g_slist_append (list, GINT_TO_POINTER (color));
 176
 177         /*
 178          * Transfer old list to new list, ignoring any duplicate of this color
 179          */
 180         old_list = get_color_list (this);
 181         for ( p = old_list; p; p=p->next )
 182         {
 183                 if ( color != (guint)GPOINTER_TO_INT (p->data) )
 184                 {
 185                         list = g_slist_append (list, p->data);
 186                 }
 187         }
 188         g_slist_free (old_list);
 189
 190         /*
 191          * Truncate list to maximum size
 192          */
 193         while (g_slist_length (list) > this->priv->max_n)
 194         {
 195                 p = g_slist_last (list);
 196                 list = g_slist_remove_link (list, p);
 197                 g_slist_free_1 (p);
 198         }
 199
 200         /*
 201          * Update conf
 202          */
 203         gconf_client_set_list (this->priv->gconf_client,
 204                                RECENT_COLORS_KEY,
 205                                GCONF_VALUE_INT,
 206                                list,
 207                                NULL);
 208 }
 209
 210
 211 /*****************************************************************************/
 212 /* GConf notify callback.                                                    */
 213 /*****************************************************************************/
 214 static void
 215 conf_notify_cb (GConfClient         *client,
 216                 guint                cnxn_id,
 217                 GConfEntry          *entry,
 218                 glColorHistoryModel  *this)
 219 {
 220         g_signal_emit (G_OBJECT(this), signals[CHANGED], 0);
 221 }
 222
 223
 224 /*****************************************************************************/
 225 /* Get list of colors.                                                       */
 226 /*****************************************************************************/
 227 static GSList *
 228 get_color_list (glColorHistoryModel *this)
 229 {
 230         GSList *list;
 231
 232         /*
 233          * Get color list.
 234          */
 235         list = gconf_client_get_list (this->priv->gconf_client,
 236                                       RECENT_COLORS_KEY,
 237                                       GCONF_VALUE_INT,
 238                                       NULL);
 239         return list;
 240 }
 241
 242
 243 /*****************************************************************************/
 244 /* Get color.                                                                */
 245 /*****************************************************************************/
 246 guint
 247 gl_color_history_model_get_color (glColorHistoryModel *this,
 248                                   guint                i)
 249 {
 250         guint   color = 0;
 251         GSList *list;
 252         GSList *p;
 253
 254         list = get_color_list (this);
 255         p = g_slist_nth (list, i);
 256         if (p)
 257         {
 258                 color = GPOINTER_TO_INT (p->data);
 259         }
 260         g_slist_free (list);
 261
 262         return color;
 263 }
 264
 265
 266
 267
 268 /*
 269  * Local Variables:       -- emacs
 270  * mode: C                -- emacs
 271  * c-basic-offset: 8      -- emacs
 272  * tab-width: 8           -- emacs
 273  * indent-tabs-mode: nil  -- emacs
 274  * End:                   -- emacs
 275  */