Pileus Git - ~andy/gtk/blob - gtk/gtkcellrendererpixbuf.c

   1 /* gtkcellrendererpixbuf.c
   2  * Copyright (C) 2000  Red Hat, Inc.,  Jonathan Blandford <jrb@redhat.com>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library 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  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library 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 <stdlib.h>
  21 #include "gtkcellrendererpixbuf.h"
  22 #include "gtkintl.h"
  23
  24 static void gtk_cell_renderer_pixbuf_get_property  (GObject                    *object,
  25                                                     guint                       param_id,
  26                                                     GValue                     *value,
  27                                                     GParamSpec                 *pspec,
  28                                                     const gchar                *trailer);
  29 static void gtk_cell_renderer_pixbuf_set_property  (GObject                    *object,
  30                                                     guint                       param_id,
  31                                                     const GValue               *value,
  32                                                     GParamSpec                 *pspec,
  33                                                     const gchar                *trailer);
  34 static void gtk_cell_renderer_pixbuf_init       (GtkCellRendererPixbuf      *celltext);
  35 static void gtk_cell_renderer_pixbuf_class_init (GtkCellRendererPixbufClass *class);
  36 static void gtk_cell_renderer_pixbuf_get_size   (GtkCellRenderer            *cell,
  37                                                  GtkWidget                  *widget,
  38                                                  gint                       *width,
  39                                                  gint                       *height);
  40 static void gtk_cell_renderer_pixbuf_render     (GtkCellRenderer            *cell,
  41                                                  GdkWindow                  *window,
  42                                                  GtkWidget                  *widget,
  43                                                  GdkRectangle               *background_area,
  44                                                  GdkRectangle               *cell_area,
  45                                                  GdkRectangle               *expose_area,
  46                                                  guint                       flags);
  47
  48
  49 enum {
  50         PROP_ZERO,
  51         PROP_PIXBUF
  52 };
  53
  54
  55 GtkType
  56 gtk_cell_renderer_pixbuf_get_type (void)
  57 {
  58         static GtkType cell_pixbuf_type = 0;
  59
  60         if (!cell_pixbuf_type)
  61         {
  62                 static const GTypeInfo cell_pixbuf_info =
  63                 {
  64                         sizeof (GtkCellRendererPixbufClass),
  65                         NULL,           /* base_init */
  66                         NULL,           /* base_finalize */
  67                         (GClassInitFunc) gtk_cell_renderer_pixbuf_class_init,
  68                         NULL,           /* class_finalize */
  69                         NULL,           /* class_data */
  70                         sizeof (GtkCellRendererPixbuf),
  71                         0,              /* n_preallocs */
  72                         (GInstanceInitFunc) gtk_cell_renderer_pixbuf_init,
  73                 };
  74
  75                 cell_pixbuf_type = g_type_register_static (GTK_TYPE_CELL_RENDERER, "GtkCellRendererPixbuf", &cell_pixbuf_info, 0);
  76         }
  77
  78         return cell_pixbuf_type;
  79 }
  80
  81 static void
  82 gtk_cell_renderer_pixbuf_init (GtkCellRendererPixbuf *cellpixbuf)
  83 {
  84 }
  85
  86 static void
  87 gtk_cell_renderer_pixbuf_class_init (GtkCellRendererPixbufClass *class)
  88 {
  89         GObjectClass *object_class = G_OBJECT_CLASS (class);
  90         GtkCellRendererClass *cell_class = GTK_CELL_RENDERER_CLASS (class);
  91
  92         object_class->get_property = gtk_cell_renderer_pixbuf_get_property;
  93         object_class->set_property = gtk_cell_renderer_pixbuf_set_property;
  94
  95         cell_class->get_size = gtk_cell_renderer_pixbuf_get_size;
  96         cell_class->render = gtk_cell_renderer_pixbuf_render;
  97
  98         g_object_class_install_property (object_class,
  99                                          PROP_PIXBUF,
 100                                          g_param_spec_object ("pixbuf",
 101                                                               _("Pixbuf Object"),
 102                                                               _("The pixbuf to render."),
 103                                                               GDK_TYPE_PIXBUF,
 104                                                               G_PARAM_READABLE |
 105                                                               G_PARAM_WRITABLE));
 106 }
 107
 108 static void
 109 gtk_cell_renderer_pixbuf_get_property (GObject        *object,
 110                                        guint           param_id,
 111                                        GValue         *value,
 112                                        GParamSpec     *pspec,
 113                                        const gchar    *trailer)
 114 {
 115   GtkCellRendererPixbuf *cellpixbuf = GTK_CELL_RENDERER_PIXBUF (object);
 116
 117   switch (param_id)
 118     {
 119     case PROP_PIXBUF:
 120       g_value_set_object (value,
 121                           cellpixbuf->pixbuf ? G_OBJECT (cellpixbuf->pixbuf) : NULL);
 122       break;
 123     default:
 124       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
 125       break;
 126     }
 127 }
 128
 129
 130 static void
 131 gtk_cell_renderer_pixbuf_set_property (GObject      *object,
 132                                        guint         param_id,
 133                                        const GValue *value,
 134                                        GParamSpec   *pspec,
 135                                        const gchar  *trailer)
 136 {
 137   GdkPixbuf *pixbuf;
 138   GtkCellRendererPixbuf *cellpixbuf = GTK_CELL_RENDERER_PIXBUF (object);
 139
 140   switch (param_id)
 141     {
 142     case PROP_PIXBUF:
 143       pixbuf = (GdkPixbuf*) g_value_get_object (value);
 144       if (pixbuf)
 145         g_object_ref (G_OBJECT (pixbuf));
 146       if (cellpixbuf->pixbuf)
 147         g_object_unref (G_OBJECT (cellpixbuf->pixbuf));
 148       cellpixbuf->pixbuf = pixbuf;
 149       g_object_notify (object, "pixbuf");
 150       break;
 151     default:
 152       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
 153       break;
 154     }
 155 }
 156
 157 /**
 158  * gtk_cell_renderer_pixbuf_new:
 159  *
 160  * Creates a new #GtkCellRendererPixbuf. Adjust rendering
 161  * parameters using object properties. Object properties can be set
 162  * globally (with g_object_set()). Also, with #GtkTreeViewColumn, you
 163  * can bind a property to a value in a #GtkTreeModel. For example, you
 164  * can bind the "pixbuf" property on the cell renderer to a pixbuf value
 165  * in the model, thus rendering a different image in each row of the
 166  * #GtkTreeView.
 167  *
 168  * Return value: the new cell renderer
 169  **/
 170 GtkCellRenderer *
 171 gtk_cell_renderer_pixbuf_new (void)
 172 {
 173   return GTK_CELL_RENDERER (gtk_type_new (gtk_cell_renderer_pixbuf_get_type ()));
 174 }
 175
 176 static void
 177 gtk_cell_renderer_pixbuf_get_size (GtkCellRenderer *cell,
 178                                    GtkWidget       *widget,
 179                                    gint            *width,
 180                                    gint            *height)
 181 {
 182   GtkCellRendererPixbuf *cellpixbuf = (GtkCellRendererPixbuf *) cell;
 183
 184   if (width)
 185     *width = (gint) GTK_CELL_RENDERER (cellpixbuf)->xpad * 2 +
 186       (cellpixbuf->pixbuf ? gdk_pixbuf_get_width (cellpixbuf->pixbuf) : 0);
 187
 188   if (height)
 189     *height = (gint) GTK_CELL_RENDERER (cellpixbuf)->ypad * 2 +
 190       (cellpixbuf->pixbuf ? gdk_pixbuf_get_height (cellpixbuf->pixbuf) : 0);
 191 }
 192
 193 static void
 194 gtk_cell_renderer_pixbuf_render (GtkCellRenderer    *cell,
 195                                  GdkWindow          *window,
 196                                  GtkWidget          *widget,
 197                                  GdkRectangle       *background_area,
 198                                  GdkRectangle       *cell_area,
 199                                  GdkRectangle       *expose_area,
 200                                  guint               flags)
 201
 202 {
 203   GtkCellRendererPixbuf *cellpixbuf = (GtkCellRendererPixbuf *) cell;
 204   GdkPixbuf *pixbuf;
 205   guchar *pixels;
 206   gint rowstride;
 207   gint real_xoffset;
 208   gint real_yoffset;
 209   GdkRectangle pix_rect;
 210   GdkRectangle draw_rect;
 211
 212   pixbuf = cellpixbuf->pixbuf;
 213
 214   if (!pixbuf)
 215     return;
 216
 217   rowstride = gdk_pixbuf_get_rowstride (pixbuf);
 218   pixels = gdk_pixbuf_get_pixels (pixbuf);
 219
 220   real_xoffset = GTK_CELL_RENDERER (cellpixbuf)->xalign * (cell_area->width - gdk_pixbuf_get_width (pixbuf) - (2 * GTK_CELL_RENDERER (cellpixbuf)->xpad));
 221   real_xoffset = MAX (real_xoffset, 0) + GTK_CELL_RENDERER (cellpixbuf)->xpad;
 222   real_yoffset = GTK_CELL_RENDERER (cellpixbuf)->yalign * (cell_area->height - gdk_pixbuf_get_height (pixbuf) - (2 * GTK_CELL_RENDERER (cellpixbuf)->ypad));
 223   real_yoffset = MAX (real_yoffset, 0) + GTK_CELL_RENDERER (cellpixbuf)->ypad;
 224
 225   pix_rect.x = cell_area->x + real_xoffset;
 226   pix_rect.y = cell_area->y + real_yoffset;
 227   pix_rect.width = gdk_pixbuf_get_width (pixbuf);
 228   pix_rect.height = gdk_pixbuf_get_height (pixbuf);
 229
 230   if (gdk_rectangle_intersect (cell_area, &pix_rect, &draw_rect))
 231     gdk_pixbuf_render_to_drawable_alpha (pixbuf,
 232                                          window,
 233                                          /* pixbuf 0, 0 is at pix_rect.x, pix_rect.y */
 234                                          draw_rect.x - pix_rect.x,
 235                                          draw_rect.y - pix_rect.y,
 236                                          draw_rect.x,
 237                                          draw_rect.y,
 238                                          draw_rect.width,
 239                                          draw_rect.height,
 240                                          GDK_PIXBUF_ALPHA_FULL,
 241                                          0,
 242                                          GDK_RGB_DITHER_NORMAL,
 243                                          0, 0);
 244 }