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 static void gtk_cell_renderer_pixbuf_set_property  (GObject                    *object,
  29                                                     guint                       param_id,
  30                                                     const GValue               *value,
  31                                                     GParamSpec                 *pspec);
  32 static void gtk_cell_renderer_pixbuf_init       (GtkCellRendererPixbuf      *celltext);
  33 static void gtk_cell_renderer_pixbuf_class_init (GtkCellRendererPixbufClass *class);
  34 static void gtk_cell_renderer_pixbuf_get_size   (GtkCellRenderer            *cell,
  35                                                  GtkWidget                  *widget,
  36                                                  GdkRectangle               *rectangle,
  37                                                  gint                       *x_offset,
  38                                                  gint                       *y_offset,
  39                                                  gint                       *width,
  40                                                  gint                       *height);
  41 static void gtk_cell_renderer_pixbuf_render     (GtkCellRenderer            *cell,
  42                                                  GdkWindow                  *window,
  43                                                  GtkWidget                  *widget,
  44                                                  GdkRectangle               *background_area,
  45                                                  GdkRectangle               *cell_area,
  46                                                  GdkRectangle               *expose_area,
  47                                                  guint                       flags);
  48
  49
  50 enum {
  51         PROP_ZERO,
  52         PROP_PIXBUF,
  53         PROP_PIXBUF_EXPANDER_OPEN,
  54         PROP_PIXBUF_EXPANDER_CLOSED
  55 };
  56
  57
  58 GtkType
  59 gtk_cell_renderer_pixbuf_get_type (void)
  60 {
  61         static GtkType cell_pixbuf_type = 0;
  62
  63         if (!cell_pixbuf_type)
  64         {
  65                 static const GTypeInfo cell_pixbuf_info =
  66                 {
  67                         sizeof (GtkCellRendererPixbufClass),
  68                         NULL,           /* base_init */
  69                         NULL,           /* base_finalize */
  70                         (GClassInitFunc) gtk_cell_renderer_pixbuf_class_init,
  71                         NULL,           /* class_finalize */
  72                         NULL,           /* class_data */
  73                         sizeof (GtkCellRendererPixbuf),
  74                         0,              /* n_preallocs */
  75                         (GInstanceInitFunc) gtk_cell_renderer_pixbuf_init,
  76                 };
  77
  78                 cell_pixbuf_type = g_type_register_static (GTK_TYPE_CELL_RENDERER, "GtkCellRendererPixbuf", &cell_pixbuf_info, 0);
  79         }
  80
  81         return cell_pixbuf_type;
  82 }
  83
  84 static void
  85 gtk_cell_renderer_pixbuf_init (GtkCellRendererPixbuf *cellpixbuf)
  86 {
  87 }
  88
  89 static void
  90 gtk_cell_renderer_pixbuf_class_init (GtkCellRendererPixbufClass *class)
  91 {
  92         GObjectClass *object_class = G_OBJECT_CLASS (class);
  93         GtkCellRendererClass *cell_class = GTK_CELL_RENDERER_CLASS (class);
  94
  95         object_class->get_property = gtk_cell_renderer_pixbuf_get_property;
  96         object_class->set_property = gtk_cell_renderer_pixbuf_set_property;
  97
  98         cell_class->get_size = gtk_cell_renderer_pixbuf_get_size;
  99         cell_class->render = gtk_cell_renderer_pixbuf_render;
 100
 101         g_object_class_install_property (object_class,
 102                                          PROP_PIXBUF,
 103                                          g_param_spec_object ("pixbuf",
 104                                                               _("Pixbuf Object"),
 105                                                               _("The pixbuf to render."),
 106                                                               GDK_TYPE_PIXBUF,
 107                                                               G_PARAM_READABLE |
 108                                                               G_PARAM_WRITABLE));
 109
 110         g_object_class_install_property (object_class,
 111                                          PROP_PIXBUF_EXPANDER_OPEN,
 112                                          g_param_spec_object ("pixbuf_expander_open",
 113                                                               _("Pixbuf Expander Open"),
 114                                                               _("Pixbuf for open expander."),
 115                                                               GDK_TYPE_PIXBUF,
 116                                                               G_PARAM_READABLE |
 117                                                               G_PARAM_WRITABLE));
 118
 119         g_object_class_install_property (object_class,
 120                                          PROP_PIXBUF_EXPANDER_CLOSED,
 121                                          g_param_spec_object ("pixbuf_expander_closed",
 122                                                               _("Pixbuf Expander Closed"),
 123                                                               _("Pixbuf for closed expander."),
 124                                                               GDK_TYPE_PIXBUF,
 125                                                               G_PARAM_READABLE |
 126                                                               G_PARAM_WRITABLE));
 127 }
 128
 129 static void
 130 gtk_cell_renderer_pixbuf_get_property (GObject        *object,
 131                                        guint           param_id,
 132                                        GValue         *value,
 133                                        GParamSpec     *pspec)
 134 {
 135   GtkCellRendererPixbuf *cellpixbuf = GTK_CELL_RENDERER_PIXBUF (object);
 136
 137   switch (param_id)
 138     {
 139     case PROP_PIXBUF:
 140       g_value_set_object (value,
 141                           cellpixbuf->pixbuf ? G_OBJECT (cellpixbuf->pixbuf) : NULL);
 142       break;
 143     case PROP_PIXBUF_EXPANDER_OPEN:
 144       g_value_set_object (value,
 145                           cellpixbuf->pixbuf_expander_open ? G_OBJECT (cellpixbuf->pixbuf_expander_open) : NULL);
 146       break;
 147     case PROP_PIXBUF_EXPANDER_CLOSED:
 148       g_value_set_object (value,
 149                           cellpixbuf->pixbuf_expander_closed ? G_OBJECT (cellpixbuf->pixbuf_expander_closed) : NULL);
 150       break;
 151     default:
 152       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
 153       break;
 154     }
 155 }
 156
 157
 158 static void
 159 gtk_cell_renderer_pixbuf_set_property (GObject      *object,
 160                                        guint         param_id,
 161                                        const GValue *value,
 162                                        GParamSpec   *pspec)
 163 {
 164   GdkPixbuf *pixbuf;
 165   GtkCellRendererPixbuf *cellpixbuf = GTK_CELL_RENDERER_PIXBUF (object);
 166
 167   switch (param_id)
 168     {
 169     case PROP_PIXBUF:
 170       pixbuf = (GdkPixbuf*) g_value_get_object (value);
 171       if (pixbuf)
 172         g_object_ref (G_OBJECT (pixbuf));
 173       if (cellpixbuf->pixbuf)
 174         g_object_unref (G_OBJECT (cellpixbuf->pixbuf));
 175       cellpixbuf->pixbuf = pixbuf;
 176       g_object_notify (object, "pixbuf");
 177       break;
 178     case PROP_PIXBUF_EXPANDER_OPEN:
 179       pixbuf = (GdkPixbuf*) g_value_get_object (value);
 180       if (pixbuf)
 181         g_object_ref (G_OBJECT (pixbuf));
 182       if (cellpixbuf->pixbuf_expander_open)
 183         g_object_unref (G_OBJECT (cellpixbuf->pixbuf_expander_open));
 184       cellpixbuf->pixbuf_expander_open = pixbuf;
 185       g_object_notify (object, "pixbuf_expander_open");
 186       break;
 187     case PROP_PIXBUF_EXPANDER_CLOSED:
 188       pixbuf = (GdkPixbuf*) g_value_get_object (value);
 189       if (pixbuf)
 190         g_object_ref (G_OBJECT (pixbuf));
 191       if (cellpixbuf->pixbuf_expander_closed)
 192         g_object_unref (G_OBJECT (cellpixbuf->pixbuf_expander_closed));
 193       cellpixbuf->pixbuf_expander_closed = pixbuf;
 194       g_object_notify (object, "pixbuf_expander_closed");
 195       break;
 196     default:
 197       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
 198       break;
 199     }
 200 }
 201
 202 /**
 203  * gtk_cell_renderer_pixbuf_new:
 204  *
 205  * Creates a new #GtkCellRendererPixbuf. Adjust rendering
 206  * parameters using object properties. Object properties can be set
 207  * globally (with g_object_set()). Also, with #GtkTreeViewColumn, you
 208  * can bind a property to a value in a #GtkTreeModel. For example, you
 209  * can bind the "pixbuf" property on the cell renderer to a pixbuf value
 210  * in the model, thus rendering a different image in each row of the
 211  * #GtkTreeView.
 212  *
 213  * Return value: the new cell renderer
 214  **/
 215 GtkCellRenderer *
 216 gtk_cell_renderer_pixbuf_new (void)
 217 {
 218   return GTK_CELL_RENDERER (gtk_type_new (gtk_cell_renderer_pixbuf_get_type ()));
 219 }
 220
 221 static void
 222 gtk_cell_renderer_pixbuf_get_size (GtkCellRenderer *cell,
 223                                    GtkWidget       *widget,
 224                                    GdkRectangle    *cell_area,
 225                                    gint            *x_offset,
 226                                    gint            *y_offset,
 227                                    gint            *width,
 228                                    gint            *height)
 229 {
 230   GtkCellRendererPixbuf *cellpixbuf = (GtkCellRendererPixbuf *) cell;
 231   gint pixbuf_width = 0;
 232   gint pixbuf_height = 0;
 233   gint calc_width;
 234   gint calc_height;
 235
 236   if (cellpixbuf->pixbuf)
 237     {
 238       pixbuf_width = gdk_pixbuf_get_width (cellpixbuf->pixbuf);
 239       pixbuf_height = gdk_pixbuf_get_height (cellpixbuf->pixbuf);
 240     }
 241   if (cellpixbuf->pixbuf_expander_open)
 242     {
 243       pixbuf_width = MAX (pixbuf_width, gdk_pixbuf_get_width (cellpixbuf->pixbuf_expander_open));
 244       pixbuf_height = MAX (pixbuf_height, gdk_pixbuf_get_height (cellpixbuf->pixbuf_expander_open));
 245     }
 246   if (cellpixbuf->pixbuf_expander_closed)
 247     {
 248       pixbuf_width = MAX (pixbuf_width, gdk_pixbuf_get_width (cellpixbuf->pixbuf_expander_closed));
 249       pixbuf_height = MAX (pixbuf_height, gdk_pixbuf_get_height (cellpixbuf->pixbuf_expander_closed));
 250     }
 251
 252   calc_width = (gint) GTK_CELL_RENDERER (cellpixbuf)->xpad * 2 + pixbuf_width;
 253   calc_height = (gint) GTK_CELL_RENDERER (cellpixbuf)->ypad * 2 + pixbuf_height;
 254
 255   if (x_offset) *x_offset = 0;
 256   if (y_offset) *y_offset = 0;
 257
 258   if (cell_area && pixbuf_width > 0 && pixbuf_height > 0)
 259     {
 260       if (x_offset)
 261         {
 262           *x_offset = GTK_CELL_RENDERER (cellpixbuf)->xalign * (cell_area->width - calc_width - (2 * GTK_CELL_RENDERER (cellpixbuf)->xpad));
 263           *x_offset = MAX (*x_offset, 0) + GTK_CELL_RENDERER (cellpixbuf)->xpad;
 264         }
 265       if (y_offset)
 266         {
 267           *y_offset = GTK_CELL_RENDERER (cellpixbuf)->yalign * (cell_area->height - calc_height - (2 * GTK_CELL_RENDERER (cellpixbuf)->ypad));
 268           *y_offset = MAX (*y_offset, 0) + GTK_CELL_RENDERER (cellpixbuf)->ypad;
 269         }
 270     }
 271
 272   if (calc_width)
 273     *width = calc_width;
 274
 275   if (height)
 276     *height = calc_height;
 277 }
 278
 279 static void
 280 gtk_cell_renderer_pixbuf_render (GtkCellRenderer    *cell,
 281                                  GdkWindow          *window,
 282                                  GtkWidget          *widget,
 283                                  GdkRectangle       *background_area,
 284                                  GdkRectangle       *cell_area,
 285                                  GdkRectangle       *expose_area,
 286                                  guint               flags)
 287
 288 {
 289   GtkCellRendererPixbuf *cellpixbuf = (GtkCellRendererPixbuf *) cell;
 290   GdkPixbuf *pixbuf;
 291   guchar *pixels;
 292   gint rowstride;
 293   GdkRectangle pix_rect;
 294   GdkRectangle draw_rect;
 295
 296   pixbuf = cellpixbuf->pixbuf;
 297   if (cell->is_expander)
 298     {
 299       if (cell->is_expanded &&
 300           cellpixbuf->pixbuf_expander_open != NULL)
 301         pixbuf = cellpixbuf->pixbuf_expander_open;
 302       else if (! cell->is_expanded &&
 303                cellpixbuf->pixbuf_expander_closed != NULL)
 304         pixbuf = cellpixbuf->pixbuf_expander_closed;
 305     }
 306
 307   if (!pixbuf)
 308     return;
 309
 310   rowstride = gdk_pixbuf_get_rowstride (pixbuf);
 311   pixels = gdk_pixbuf_get_pixels (pixbuf);
 312
 313   gtk_cell_renderer_pixbuf_get_size (cell, widget, cell_area,
 314                                      &pix_rect.x,
 315                                      &pix_rect.y,
 316                                      &pix_rect.width,
 317                                      &pix_rect.height);
 318
 319   pix_rect.x += cell_area->x;
 320   pix_rect.y += cell_area->y;
 321   pix_rect.width -= cell->xpad * 2;
 322   pix_rect.height -= cell->ypad * 2;
 323
 324   if (gdk_rectangle_intersect (cell_area, &pix_rect, &draw_rect))
 325     gdk_pixbuf_render_to_drawable_alpha (pixbuf,
 326                                          window,
 327                                          /* pixbuf 0, 0 is at pix_rect.x, pix_rect.y */
 328                                          draw_rect.x - pix_rect.x,
 329                                          draw_rect.y - pix_rect.y,
 330                                          draw_rect.x,
 331                                          draw_rect.y,
 332                                          draw_rect.width,
 333                                          draw_rect.height,
 334                                          GDK_PIXBUF_ALPHA_FULL,
 335                                          0,
 336                                          GDK_RGB_DITHER_NORMAL,
 337                                          0, 0);
 338 }