gtkstylecascade.c 11.9 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
/* GTK - The GIMP Toolkit
 * Copyright (C) 2012 Benjamin Otte <otte@gnome.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include "gtkstylecascadeprivate.h"

#include "gtkstyleprovider.h"
#include "gtkstyleproviderprivate.h"

typedef struct _GtkStyleCascadeIter GtkStyleCascadeIter;
typedef struct _GtkStyleProviderData GtkStyleProviderData;

struct _GtkStyleCascadeIter {
  int parent_index; /* pointing at last index that was returned, not next one that should be returned */
  int index;        /* pointing at last index that was returned, not next one that should be returned */
};

struct _GtkStyleProviderData
{
  GtkStyleProvider *provider;
  guint priority;
37
  guint changed_signal_id;
38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125
};

static GtkStyleProvider *
gtk_style_cascade_iter_next (GtkStyleCascade     *cascade,
                             GtkStyleCascadeIter *iter)
{
  if (iter->parent_index > 0)
    {
      if (iter->index > 0)
        {
          GtkStyleProviderData *data, *parent_data;

          data = &g_array_index (cascade->providers, GtkStyleProviderData, iter->index - 1);
          parent_data = &g_array_index (cascade->parent->providers, GtkStyleProviderData, iter->parent_index - 1);

          if (data->priority >= parent_data->priority)
            {
              iter->index--;
              return data->provider;
            }
          else
            {
              iter->parent_index--;
              return parent_data->provider;
            }
        }
      else
        {
          iter->parent_index--;
          return g_array_index (cascade->parent->providers, GtkStyleProviderData, iter->parent_index).provider;
        }
    }
  else
    {
      if (iter->index > 0)
        {
          iter->index--;
          return g_array_index (cascade->providers, GtkStyleProviderData, iter->index).provider;
        }
      else
        {
          return NULL;
        }
    }
}

static GtkStyleProvider *
gtk_style_cascade_iter_init (GtkStyleCascade     *cascade,
                             GtkStyleCascadeIter *iter)
{
  iter->parent_index = cascade->parent ? cascade->parent->providers->len : 0;
  iter->index = cascade->providers->len;

  return gtk_style_cascade_iter_next (cascade, iter);
}

static gboolean
gtk_style_cascade_get_style_property (GtkStyleProvider *provider,
                                      GtkWidgetPath    *path,
                                      GtkStateFlags     state,
                                      GParamSpec       *pspec,
                                      GValue           *value)
{
  GtkStyleCascade *cascade = GTK_STYLE_CASCADE (provider);
  GtkStyleCascadeIter iter;
  GtkStyleProvider *item;

  for (item = gtk_style_cascade_iter_init (cascade, &iter);
       item;
       item = gtk_style_cascade_iter_next (cascade, &iter))
    {
      if (gtk_style_provider_get_style_property (item,
                                                 path,
                                                 state,
                                                 pspec,
                                                 value))
        return TRUE;
    }

  return FALSE;
}

static void
gtk_style_cascade_provider_iface_init (GtkStyleProviderIface *iface)
{
  iface->get_style_property = gtk_style_cascade_get_style_property;
}

126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148
static GtkSettings *
gtk_style_cascade_get_settings (GtkStyleProviderPrivate *provider)
{
  GtkStyleCascade *cascade = GTK_STYLE_CASCADE (provider);
  GtkStyleCascadeIter iter;
  GtkSettings *settings;
  GtkStyleProvider *item;

  for (item = gtk_style_cascade_iter_init (cascade, &iter);
       item;
       item = gtk_style_cascade_iter_next (cascade, &iter))
    {
      if (!GTK_IS_STYLE_PROVIDER_PRIVATE (item))
        continue;
          
      settings = _gtk_style_provider_private_get_settings (GTK_STYLE_PROVIDER_PRIVATE (item));
      if (settings)
        return settings;
    }

  return NULL;
}

149
static GtkCssValue *
150 151 152 153 154
gtk_style_cascade_get_color (GtkStyleProviderPrivate *provider,
                             const char              *name)
{
  GtkStyleCascade *cascade = GTK_STYLE_CASCADE (provider);
  GtkStyleCascadeIter iter;
155
  GtkCssValue *color;
156 157 158 159 160 161 162 163
  GtkStyleProvider *item;

  for (item = gtk_style_cascade_iter_init (cascade, &iter);
       item;
       item = gtk_style_cascade_iter_next (cascade, &iter))
    {
      if (GTK_IS_STYLE_PROVIDER_PRIVATE (item))
        {
164 165 166
          color = _gtk_style_provider_private_get_color (GTK_STYLE_PROVIDER_PRIVATE (item), name);
          if (color)
            return color;
167 168 169 170 171 172 173 174 175 176
        }
      else
        {
          /* If somebody hits this code path, shout at them */
        }
    }

  return NULL;
}

177 178 179 180 181 182 183 184
static int
gtk_style_cascade_get_scale (GtkStyleProviderPrivate *provider)
{
  GtkStyleCascade *cascade = GTK_STYLE_CASCADE (provider);

  return cascade->scale;
}

Matthias Clasen's avatar
Matthias Clasen committed
185
static GtkCssKeyframes *
186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208
gtk_style_cascade_get_keyframes (GtkStyleProviderPrivate *provider,
                                 const char              *name)
{
  GtkStyleCascade *cascade = GTK_STYLE_CASCADE (provider);
  GtkStyleCascadeIter iter;
  GtkCssKeyframes *keyframes;
  GtkStyleProvider *item;

  for (item = gtk_style_cascade_iter_init (cascade, &iter);
       item;
       item = gtk_style_cascade_iter_next (cascade, &iter))
    {
      if (!GTK_IS_STYLE_PROVIDER_PRIVATE (item))
        continue;
          
      keyframes = _gtk_style_provider_private_get_keyframes (GTK_STYLE_PROVIDER_PRIVATE (item), name);
      if (keyframes)
        return keyframes;
    }

  return NULL;
}

209 210
static void
gtk_style_cascade_lookup (GtkStyleProviderPrivate *provider,
211
                          const GtkCssMatcher     *matcher,
212 213
                          GtkCssLookup            *lookup,
                          GtkCssChange            *change)
214 215 216 217
{
  GtkStyleCascade *cascade = GTK_STYLE_CASCADE (provider);
  GtkStyleCascadeIter iter;
  GtkStyleProvider *item;
218
  GtkCssChange iter_change;
219 220 221 222 223 224 225 226

  for (item = gtk_style_cascade_iter_init (cascade, &iter);
       item;
       item = gtk_style_cascade_iter_next (cascade, &iter))
    {
      if (GTK_IS_STYLE_PROVIDER_PRIVATE (item))
        {
          _gtk_style_provider_private_lookup (GTK_STYLE_PROVIDER_PRIVATE (item),
227
                                              matcher,
228 229 230 231
                                              lookup,
                                              change ? &iter_change : NULL);
          if (change)
            *change |= iter_change;
232 233 234
        }
      else
        {
235 236
          /* you lose */
          g_warn_if_reached ();
237 238 239 240 241 242 243 244
        }
    }
}

static void
gtk_style_cascade_provider_private_iface_init (GtkStyleProviderPrivateInterface *iface)
{
  iface->get_color = gtk_style_cascade_get_color;
245
  iface->get_settings = gtk_style_cascade_get_settings;
246
  iface->get_scale = gtk_style_cascade_get_scale;
247
  iface->get_keyframes = gtk_style_cascade_get_keyframes;
248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280
  iface->lookup = gtk_style_cascade_lookup;
}

G_DEFINE_TYPE_EXTENDED (GtkStyleCascade, _gtk_style_cascade, G_TYPE_OBJECT, 0,
                        G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
                                               gtk_style_cascade_provider_iface_init)
                        G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER_PRIVATE,
                                               gtk_style_cascade_provider_private_iface_init));

static void
gtk_style_cascade_dispose (GObject *object)
{
  GtkStyleCascade *cascade = GTK_STYLE_CASCADE (object);

  _gtk_style_cascade_set_parent (cascade, NULL);
  g_array_unref (cascade->providers);

  G_OBJECT_CLASS (_gtk_style_cascade_parent_class)->dispose (object);
}

static void
_gtk_style_cascade_class_init (GtkStyleCascadeClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->dispose = gtk_style_cascade_dispose;
}

static void
style_provider_data_clear (gpointer data_)
{
  GtkStyleProviderData *data = data_;

281
  g_signal_handler_disconnect (data->provider, data->changed_signal_id);
282 283 284 285 286 287
  g_object_unref (data->provider);
}

static void
_gtk_style_cascade_init (GtkStyleCascade *cascade)
{
288 289
  cascade->scale = 1;

290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312
  cascade->providers = g_array_new (FALSE, FALSE, sizeof (GtkStyleProviderData));
  g_array_set_clear_func (cascade->providers, style_provider_data_clear);
}

GtkStyleCascade *
_gtk_style_cascade_new (void)
{
  return g_object_new (GTK_TYPE_STYLE_CASCADE, NULL);
}

void
_gtk_style_cascade_set_parent (GtkStyleCascade *cascade,
                               GtkStyleCascade *parent)
{
  g_return_if_fail (GTK_IS_STYLE_CASCADE (cascade));
  g_return_if_fail (parent == NULL || GTK_IS_STYLE_CASCADE (parent));
  if (parent)
    g_return_if_fail (parent->parent == NULL);

  if (cascade->parent == parent)
    return;

  if (parent)
313 314 315 316 317 318 319
    {
      g_object_ref (parent);
      g_signal_connect_swapped (parent,
                                "-gtk-private-changed",
                                G_CALLBACK (_gtk_style_provider_private_changed),
                                cascade);
    }
320 321

  if (cascade->parent)
322 323 324 325 326 327
    {
      g_signal_handlers_disconnect_by_func (cascade->parent, 
                                            _gtk_style_provider_private_changed,
                                            cascade);
      g_object_unref (cascade->parent);
    }
328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345

  cascade->parent = parent;
}

void
_gtk_style_cascade_add_provider (GtkStyleCascade  *cascade,
                                 GtkStyleProvider *provider,
                                 guint             priority)
{
  GtkStyleProviderData data;
  guint i;

  g_return_if_fail (GTK_IS_STYLE_CASCADE (cascade));
  g_return_if_fail (GTK_IS_STYLE_PROVIDER (provider));
  g_return_if_fail (GTK_STYLE_PROVIDER (cascade) != provider);

  data.provider = g_object_ref (provider);
  data.priority = priority;
346 347 348 349
  data.changed_signal_id = g_signal_connect_swapped (provider,
                                                     "-gtk-private-changed",
                                                     G_CALLBACK (_gtk_style_provider_private_changed),
                                                     cascade);
350 351 352 353 354 355 356 357 358 359

  /* ensure it gets removed first */
  _gtk_style_cascade_remove_provider (cascade, provider);

  for (i = 0; i < cascade->providers->len; i++)
    {
      if (g_array_index (cascade->providers, GtkStyleProviderData, i).priority > priority)
        break;
    }
  g_array_insert_val (cascade->providers, i, data);
360 361

  _gtk_style_provider_private_changed (GTK_STYLE_PROVIDER_PRIVATE (cascade));
362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379
}

void
_gtk_style_cascade_remove_provider (GtkStyleCascade  *cascade,
                                    GtkStyleProvider *provider)
{
  guint i;

  g_return_if_fail (GTK_IS_STYLE_CASCADE (cascade));
  g_return_if_fail (GTK_IS_STYLE_PROVIDER (provider));

  for (i = 0; i < cascade->providers->len; i++)
    {
      GtkStyleProviderData *data = &g_array_index (cascade->providers, GtkStyleProviderData, i);

      if (data->provider == provider)
        {
          g_array_remove_index (cascade->providers, i);
380 381
  
          _gtk_style_provider_private_changed (GTK_STYLE_PROVIDER_PRIVATE (cascade));
382 383 384 385 386
          break;
        }
    }
}

387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407
void
_gtk_style_cascade_set_scale (GtkStyleCascade *cascade,
                              int              scale)
{
  g_return_if_fail (GTK_IS_STYLE_CASCADE (cascade));

  if (cascade->scale == scale)
    return;

  cascade->scale = scale;

  _gtk_style_provider_private_changed (GTK_STYLE_PROVIDER_PRIVATE (cascade));
}

int
_gtk_style_cascade_get_scale (GtkStyleCascade *cascade)
{
  g_return_val_if_fail (GTK_IS_STYLE_CASCADE (cascade), 1);

  return cascade->scale;
}