src/provider.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2 /*
   3  * provider.cpp: an api for PropertyValue providers (for property inheritance)
   4  *
   5  * Copyright 2007 Novell, Inc. (http://www.novell.com)
   6  *
   7  * See the LICENSE file included with the distribution for details.
   8  *
   9  */
  10
  11 #include <config.h>
  12
  13 #include "cbinding.h"
  14 #include "runtime.h"
  15 #include "provider.h"
  16 #include "control.h"
  17 #include "frameworkelement.h"
  18 #include "textblock.h"
  19 #include "style.h"
  20 #include "deployment.h"
  21
  22 //
  23 // LocalPropertyValueProvider
  24 //
  25
  26 LocalPropertyValueProvider::LocalPropertyValueProvider (DependencyObject *obj, PropertyPrecedence precedence)
  27         : PropertyValueProvider (obj, precedence)
  28 {
  29         // XXX maybe move the "DependencyObject::current_values" hash table here?
  30 }
  31
  32 LocalPropertyValueProvider::~LocalPropertyValueProvider ()
  33 {
  34 }
  35
  36 Value *
  37 LocalPropertyValueProvider::GetPropertyValue (DependencyProperty *property)
  38 {
  39         return (Value *) g_hash_table_lookup (obj->GetLocalValues (), property);
  40 }
  41
  42
  43 //
  44 // StylePropertyValueProvider
  45 //
  46
  47 StylePropertyValueProvider::StylePropertyValueProvider (DependencyObject *obj, PropertyPrecedence precedence)
  48         : PropertyValueProvider (obj, precedence)
  49 {
  50         style_hash = g_hash_table_new_full (g_direct_hash, g_direct_equal,
  51                                             (GDestroyNotify)NULL,
  52                                             (GDestroyNotify)event_object_unref);
  53 }
  54
  55 void
  56 StylePropertyValueProvider::unlink_converted_value (gpointer key, gpointer value, gpointer data)
  57 {
  58         StylePropertyValueProvider *provider = (StylePropertyValueProvider*)data;
  59         Setter *s = (Setter*)value;
  60
  61         Value *v = s->GetValue(Setter::ConvertedValueProperty);
  62         if (v->Is(s->GetDeployment (), Type::DEPENDENCY_OBJECT)) {
  63                 DependencyObject *dob = v->AsDependencyObject();
  64                 if (dob->GetParent() == provider->obj)
  65                         dob->SetParent(NULL, NULL);
  66         }
  67 }
  68
  69 StylePropertyValueProvider::~StylePropertyValueProvider ()
  70 {
  71         g_hash_table_foreach (style_hash, StylePropertyValueProvider::unlink_converted_value, this);
  72         g_hash_table_destroy (style_hash);
  73 }
  74
  75 Value*
  76 StylePropertyValueProvider::GetPropertyValue (DependencyProperty *property)
  77 {
  78         Setter *setter = (Setter*)g_hash_table_lookup (style_hash, property);
  79
  80         if (!setter)
  81                 return NULL;
  82         else
  83                 return setter->GetValue (Setter::ConvertedValueProperty);
  84 }
  85
  86 void
  87 StylePropertyValueProvider::RecomputePropertyValue (DependencyProperty *prop)
  88 {
  89         Style *style = ((FrameworkElement*)obj)->GetStyle();
  90         if (!style)
  91                 return;
  92
  93         DependencyProperty *property = NULL;
  94         Value *value = NULL;
  95         SetterBaseCollection *setters = style->GetSetters ();
  96         if (!setters)
  97                 return;
  98
  99         CollectionIterator *iter = setters->GetIterator ();
 100         CollectionIteratorError err;
 101         Value *setterBase;
 102
 103         while (iter->Next (&err) && (setterBase = iter->GetCurrent (&err))) {
 104                 if (!setterBase->Is (obj->GetDeployment (), Type::SETTER))
 105                         continue;
 106
 107                 Setter *setter = setterBase->AsSetter ();
 108                 if (!(value = setter->GetValue (Setter::PropertyProperty)))
 109                         continue;
 110
 111                 if (!(property = value->AsDependencyProperty ()))
 112                         continue;
 113
 114                 if (prop == property) {
 115                         // the hash holds a ref
 116                         setter->ref ();
 117                         g_hash_table_insert (style_hash, property, setter);
 118                         delete iter;
 119                         return;
 120                 }
 121         }
 122
 123         delete iter;
 124
 125 }
 126
 127 void
 128 StylePropertyValueProvider::SealStyle (Style *style)
 129 {
 130         style->Seal ();
 131
 132         SetterBaseCollection *setters = style->GetSetters ();
 133         if (!setters)
 134                 return;
 135
 136         CollectionIterator *iter = setters->GetIterator ();
 137         CollectionIteratorError err;
 138         Value *setterBase;
 139
 140         while (iter->Next (&err) && (setterBase = iter->GetCurrent (&err))) {
 141                 if (!setterBase->Is (obj->GetDeployment (), Type::SETTER))
 142                         continue;
 143
 144                 Setter *setter = setterBase->AsSetter ();
 145
 146                 DependencyProperty *setter_property;
 147                 Value *value;
 148
 149                 if (!(value = setter->GetValue (Setter::PropertyProperty)))
 150                         continue;
 151
 152                 if (!(setter_property = value->AsDependencyProperty ()))
 153                         continue;
 154
 155                 Value *setter_value;
 156                 if (!(setter_value = setter->GetValue (Setter::ConvertedValueProperty)))
 157                         continue;
 158
 159                 // the hash holds a ref
 160                 setter->ref ();
 161                 g_hash_table_insert (style_hash, setter_property, setter);
 162
 163                 MoonError error;
 164                 obj->ProviderValueChanged (precedence, setter_property, NULL, setter_value, true, true, &error);
 165         }
 166
 167         delete iter;
 168 }
 169
 170
 171 //
 172 // InheritedPropertyValueProvider
 173 //
 174 Value*
 175 InheritedPropertyValueProvider::GetPropertyValue (DependencyProperty *property)
 176 {
 177         int propertyId = property->GetId ();
 178
 179         if (!IsPropertyInherited (propertyId))
 180                 return NULL;
 181
 182         int parentPropertyId = -1;
 183
 184         Types *types =  Deployment::GetCurrent()->GetTypes();
 185
 186 #define INHERIT_CTI_CTI(p) \
 187         G_STMT_START {                                                  \
 188         if (property->GetId () == Control::p ||                         \
 189             property->GetId () == TextBlock::p ||                       \
 190             property->GetId () == Inline::p) {                          \
 191                                                                         \
 192                 if (types->IsSubclassOf (parent->GetObjectType(), Type::CONTROL)) \
 193                         parentPropertyId = Control::p;                  \
 194                 else if (types->IsSubclassOf (parent->GetObjectType(), Type::TEXTBLOCK)) \
 195                         parentPropertyId = TextBlock::p;                \
 196         }                                                               \
 197         } G_STMT_END
 198
 199
 200 #define INHERIT_I_T(p) \
 201         G_STMT_START {                                                  \
 202         if (property->GetId () == Inline::p) {                          \
 203                 parentPropertyId = TextBlock::p;                        \
 204         }                                                               \
 205         } G_STMT_END
 206
 207 #define INHERIT_F_F(p) \
 208         G_STMT_START {                                                  \
 209         if (property->GetId () == FrameworkElement::p) {                \
 210                 parentPropertyId = FrameworkElement::p;                 \
 211         }                                                               \
 212         } G_STMT_END
 213
 214 #define INHERIT_U_U(p) \
 215         G_STMT_START {                                                  \
 216         if (property->GetId () == UIElement::p) {               \
 217                 parentPropertyId = UIElement::p;                        \
 218         }                                                               \
 219         } G_STMT_END
 220
 221         DependencyObject *parent = NULL;
 222
 223         if (types->IsSubclassOf (obj->GetObjectType(), Type::FRAMEWORKELEMENT)) {
 224                 // we loop up the visual tree
 225                 parent = ((FrameworkElement*)obj)->GetVisualParent();
 226                 if (parent) {
 227                         while (parent) {
 228                                 INHERIT_CTI_CTI (ForegroundProperty);
 229                                 INHERIT_CTI_CTI (FontFamilyProperty);
 230                                 INHERIT_CTI_CTI (FontStretchProperty);
 231                                 INHERIT_CTI_CTI (FontStyleProperty);
 232                                 INHERIT_CTI_CTI (FontWeightProperty);
 233                                 INHERIT_CTI_CTI (FontSizeProperty);
 234
 235                                 INHERIT_F_F (LanguageProperty);
 236                                 INHERIT_F_F (DataContextProperty);
 237
 238                                 INHERIT_U_U (UseLayoutRoundingProperty);
 239
 240                                 if (parentPropertyId != -1)
 241                                         return parent->GetValue (types->GetProperty (parentPropertyId));
 242
 243                                 parent = ((FrameworkElement*)parent)->GetVisualParent();
 244                         }
 245                 }
 246         }
 247         else if (types->IsSubclassOf (obj->GetObjectType(), Type::INLINE)) {
 248                 // skip collections
 249                 DependencyObject *new_parent = obj->GetParent();
 250                 while (new_parent && !types->IsSubclassOf (new_parent->GetObjectType(), Type::TEXTBLOCK))
 251                         new_parent = new_parent->GetParent ();
 252                 parent = new_parent;
 253
 254                 if (!parent)
 255                         return NULL;
 256
 257                 INHERIT_I_T (ForegroundProperty);
 258                 INHERIT_I_T (FontFamilyProperty);
 259                 INHERIT_I_T (FontStretchProperty);
 260                 INHERIT_I_T (FontStyleProperty);
 261                 INHERIT_I_T (FontWeightProperty);
 262                 INHERIT_I_T (FontSizeProperty);
 263
 264                 INHERIT_I_T (LanguageProperty);
 265                 INHERIT_I_T (TextDecorationsProperty);
 266
 267                 if (parentPropertyId != -1) {
 268                         return parent->GetValue (parentPropertyId);
 269                 }
 270         }
 271
 272         return NULL;
 273 }
 274
 275
 276 bool
 277 InheritedPropertyValueProvider::IsPropertyInherited (int propertyId)
 278 {
 279 #define PROP_CTI(p) G_STMT_START { \
 280         if (propertyId == Control::p) return true; \
 281         if (propertyId == TextBlock::p) return true; \
 282         if (propertyId == Inline::p) return true; \
 283         } G_STMT_END
 284
 285 #define PROP_F(p) G_STMT_START { \
 286         if (propertyId == FrameworkElement::p) return true; \
 287         } G_STMT_END
 288
 289 #define PROP_U(p) G_STMT_START { \
 290         if (propertyId == UIElement::p) return true; \
 291         } G_STMT_END
 292
 293 #define PROP_I(p) G_STMT_START { \
 294         if (propertyId == Inline::p) return true; \
 295         } G_STMT_END
 296
 297         PROP_CTI (ForegroundProperty);
 298         PROP_CTI (FontFamilyProperty);
 299         PROP_CTI (FontStretchProperty);
 300         PROP_CTI (FontStyleProperty);
 301         PROP_CTI (FontWeightProperty);
 302         PROP_CTI (FontSizeProperty);
 303
 304         PROP_U (UseLayoutRoundingProperty);
 305
 306         PROP_F (LanguageProperty);
 307         PROP_F (DataContextProperty);
 308
 309         PROP_I (LanguageProperty);
 310         PROP_I (TextDecorationsProperty);
 311
 312         return false;
 313 }
 314
 315 DependencyProperty*
 316 InheritedPropertyValueProvider::MapPropertyToDescendant (Types *types,
 317                                                          DependencyProperty *property,
 318                                                          Type::Kind descendantKind)
 319 {
 320 #define PROPAGATE_C_CT(p) G_STMT_START {                                \
 321                 if (property->GetId() == Control::p) {                  \
 322                         if (types->IsSubclassOf (descendantKind, Type::CONTROL)) \
 323                                 return types->GetProperty (Control::p); \
 324                         else if (types->IsSubclassOf (descendantKind, Type::TEXTBLOCK)) \
 325                                 return types->GetProperty (TextBlock::p); \
 326                 }                                                       \
 327         } G_STMT_END
 328
 329 #define PROPAGATE_T_I(p) G_STMT_START {                                 \
 330                 if (property->GetId() == TextBlock::p) {                \
 331                         /* we don't need the check here since we can do it once above all the PROPAGATE_I below */ \
 332                         /*if (types->IsSubclassOf (descendantKind, Type::INLINE))*/ \
 333                                 return types->GetProperty (Inline::p); \
 334                 }                                                       \
 335         } G_STMT_END
 336
 337         if (types->IsSubclassOf (property->GetOwnerType(), Type::CONTROL)) {
 338                 PROPAGATE_C_CT (ForegroundProperty);
 339                 PROPAGATE_C_CT (FontFamilyProperty);
 340                 PROPAGATE_C_CT (FontStretchProperty);
 341                 PROPAGATE_C_CT (FontStyleProperty);
 342                 PROPAGATE_C_CT (FontWeightProperty);
 343                 PROPAGATE_C_CT (FontSizeProperty);
 344         }
 345
 346         if (types->IsSubclassOf (property->GetOwnerType(), Type::TEXTBLOCK)) {
 347                 if (types->IsSubclassOf (descendantKind, Type::INLINE)) {
 348                         PROPAGATE_T_I (ForegroundProperty);
 349                         PROPAGATE_T_I (FontFamilyProperty);
 350                         PROPAGATE_T_I (FontStretchProperty);
 351                         PROPAGATE_T_I (FontStyleProperty);
 352                         PROPAGATE_T_I (FontWeightProperty);
 353                         PROPAGATE_T_I (FontSizeProperty);
 354
 355                         PROPAGATE_T_I (LanguageProperty);
 356                         PROPAGATE_T_I (TextDecorationsProperty);
 357                 }
 358         }
 359
 360         if (types->IsSubclassOf (property->GetOwnerType(), Type::FRAMEWORKELEMENT)) {
 361                 if (types->IsSubclassOf (descendantKind, Type::FRAMEWORKELEMENT)) {
 362                         if (property->GetId() == FrameworkElement::LanguageProperty
 363                             || property->GetId() == FrameworkElement::DataContextProperty)
 364                                 return property;
 365                 }
 366         }
 367
 368         if (types->IsSubclassOf (property->GetOwnerType(), Type::UIELEMENT)) {
 369                 if (types->IsSubclassOf (descendantKind, Type::UIELEMENT)) {
 370                         if (property->GetId() == UIElement::UseLayoutRoundingProperty)
 371                                 return property;
 372                 }
 373         }
 374
 375         return NULL;
 376 }
 377
 378 void
 379 InheritedPropertyValueProvider::PropagateInheritedProperty (DependencyObject *obj, DependencyProperty *property, Value *old_value, Value *new_value)
 380 {
 381         Types *types = obj->GetDeployment ()->GetTypes ();
 382
 383         if (types->IsSubclassOf (obj->GetObjectType(), Type::TEXTBLOCK)) {
 384                 InlineCollection *inlines = ((TextBlock*)obj)->GetInlines();
 385
 386                 // lift this out of the loop since we know all
 387                 // elements of InlinesProperty will be inlines.
 388                 DependencyProperty *child_property = MapPropertyToDescendant (types, property, Type::INLINE);
 389                 if (!child_property)
 390                         return;
 391
 392                 for (int i = 0; i < inlines->GetCount (); i++) {
 393                         Inline *item = inlines->GetValueAt (i)->AsInline ();
 394
 395                         MoonError error;
 396
 397                         item->ProviderValueChanged (PropertyPrecedence_Inherited, child_property,
 398                                                     old_value, new_value, false, false, &error);
 399
 400                         if (error.number) {
 401                                 // FIXME: what do we do here?  I'm guessing we continue propagating?
 402                         }
 403                 }
 404
 405         }
 406         else {
 407                 // for inherited properties, we need to walk down the
 408                 // subtree and call ProviderValueChanged on all
 409                 // elements that can inherit the property.
 410                 DeepTreeWalker walker ((UIElement*)obj, Logical, types);
 411
 412                 walker.Step (); // skip obj
 413
 414                 while (UIElement *element = walker.Step ()) {
 415                         DependencyProperty *child_property = MapPropertyToDescendant (types, property, element->GetObjectType());
 416                         if (!child_property)
 417                                 continue;
 418
 419                         MoonError error;
 420
 421                         element->ProviderValueChanged (PropertyPrecedence_Inherited, child_property,
 422                                                        old_value, new_value, true, true, &error);
 423
 424                         if (error.number) {
 425                                 // FIXME: what do we do here?  I'm guessing we continue propagating?
 426                         }
 427
 428                         walker.SkipBranch ();
 429                 }
 430         }
 431 }
 432
 433 #define FOREGROUND_PROP     (1<<0)
 434 #define FONTFAMILY_PROP     (1<<1)
 435 #define FONTSTRETCH_PROP    (1<<2)
 436 #define FONTSTYLE_PROP      (1<<3)
 437 #define FONTWEIGHT_PROP     (1<<4)
 438 #define FONTSIZE_PROP       (1<<5)
 439 #define LANGUAGE_PROP       (1<<6)
 440 #define DATACONTEXT_PROP    (1<<7)
 441 #define LAYOUTROUNDING_PROP (1<<8)
 442
 443 #define HAS_SEEN(s,p)  (((s) & (p))!=0)
 444 #define SEEN(s,p)      ((s)|=(p))
 445
 446 #define PROP_ADD(p,s) G_STMT_START {                                    \
 447         if (!HAS_SEEN (seen, s)) {                                      \
 448                 DependencyProperty *property = types->GetProperty (p);          \
 449                 Value *v = element->GetValue (property, PropertyPrecedence_Inherited, PropertyPrecedence_Inherited); \
 450                 if (v != NULL) {                                        \
 451                         element->ProviderValueChanged (PropertyPrecedence_Inherited, property, \
 452                                                        NULL, v,         \
 453                                                        true, true, &error); \
 454                         SEEN (seen, s);                                 \
 455                 }                                                       \
 456         }                                                               \
 457         } G_STMT_END
 458
 459 static void
 460 walk_tree (Types *types, UIElement *element, guint32 seen)
 461 {
 462         MoonError error;
 463
 464         if (types->IsSubclassOf (element->GetObjectType (), Type::CONTROL)) {
 465                 PROP_ADD (Control::ForegroundProperty, FOREGROUND_PROP);
 466                 PROP_ADD (Control::FontFamilyProperty, FONTFAMILY_PROP);
 467                 PROP_ADD (Control::FontStretchProperty, FONTSTRETCH_PROP);
 468                 PROP_ADD (Control::FontStyleProperty, FONTSTYLE_PROP);
 469                 PROP_ADD (Control::FontWeightProperty, FONTWEIGHT_PROP);
 470                 PROP_ADD (Control::FontSizeProperty, FONTSIZE_PROP);
 471         }
 472
 473         if (types->IsSubclassOf (element->GetObjectType (), Type::TEXTBLOCK)) {
 474                 PROP_ADD (TextBlock::ForegroundProperty, FOREGROUND_PROP);
 475                 PROP_ADD (TextBlock::FontFamilyProperty, FONTFAMILY_PROP);
 476                 PROP_ADD (TextBlock::FontStretchProperty, FONTSTRETCH_PROP);
 477                 PROP_ADD (TextBlock::FontStyleProperty, FONTSTYLE_PROP);
 478                 PROP_ADD (TextBlock::FontWeightProperty, FONTWEIGHT_PROP);
 479                 PROP_ADD (TextBlock::FontSizeProperty, FONTSIZE_PROP);
 480         }
 481
 482         if (types->IsSubclassOf (element->GetObjectType (), Type::FRAMEWORKELEMENT)) {
 483                 PROP_ADD (FrameworkElement::LanguageProperty, LANGUAGE_PROP);
 484                 PROP_ADD (FrameworkElement::DataContextProperty, DATACONTEXT_PROP);
 485         }
 486
 487
 488         PROP_ADD (UIElement::UseLayoutRoundingProperty, LAYOUTROUNDING_PROP);
 489
 490         VisualTreeWalker walker ((UIElement*)element, Logical, types);
 491
 492         while (UIElement *child = walker.Step ())
 493                 walk_tree (types, child, seen);
 494
 495 }
 496
 497 void
 498 InheritedPropertyValueProvider::PropagateInheritedPropertiesOnAddingToTree (UIElement *subtreeRoot)
 499 {
 500         Types *types = subtreeRoot->GetDeployment ()->GetTypes ();
 501
 502         walk_tree (types, subtreeRoot, 0);
 503 }
 504
 505 //
 506 // DefaultPropertyValueProvider
 507 //
 508
 509 Value *
 510 DefaultValuePropertyValueProvider::GetPropertyValue (DependencyProperty *property)
 511 {
 512         return property->GetDefaultValue ();
 513 }
 514
 515
 516 //
 517 // AutoPropertyValueProvider
 518 //
 519
 520 static gboolean
 521 dispose_value (gpointer key, gpointer value, gpointer data)
 522 {
 523         DependencyObject *obj = (DependencyObject *) data;
 524         Value *v = (Value *) value;
 525
 526         if (!value)
 527                 return true;
 528
 529         // detach from the existing value
 530         if (v->Is (obj->GetDeployment (), Type::DEPENDENCY_OBJECT)) {
 531                 DependencyObject *dob = v->AsDependencyObject ();
 532
 533                 if (dob != NULL) {
 534                         if (obj == dob->GetParent ()) {
 535                                 // unset its logical parent
 536                                 dob->SetParent (NULL, NULL);
 537                         }
 538
 539                         // unregister from the existing value
 540                         dob->RemovePropertyChangeListener (obj, NULL);
 541                 }
 542         }
 543
 544         delete v;
 545
 546         return true;
 547 }
 548
 549 AutoCreatePropertyValueProvider::AutoCreatePropertyValueProvider (DependencyObject *obj, PropertyPrecedence precedence)
 550         : PropertyValueProvider (obj, precedence)
 551 {
 552         auto_values = g_hash_table_new (g_direct_hash, g_direct_equal);
 553 }
 554
 555 AutoCreatePropertyValueProvider::~AutoCreatePropertyValueProvider ()
 556 {
 557         g_hash_table_foreach_remove (auto_values, dispose_value, obj);
 558         g_hash_table_destroy (auto_values);
 559 }
 560
 561 Value *
 562 AutoCreatePropertyValueProvider::GetPropertyValue (DependencyProperty *property)
 563 {
 564         Value *value;
 565
 566         if (!property->IsAutoCreated ())
 567                 return NULL;
 568
 569         // return previously set auto value next
 570         if ((value = (Value *) g_hash_table_lookup (auto_values, property)))
 571                 return value;
 572
 573         value = (property->GetAutoCreator()) (obj, property);
 574
 575 #if SANITY
 576         Deployment *deployment = Deployment::GetCurrent ();
 577         if (!value->Is(deployment, property->GetPropertyType()))
 578                 g_warning ("autocreated value for property '%s' (type=%s) is of incompatible type %s\n",
 579                            property->GetName(),
 580                            Type::Find (deployment, property->GetPropertyType ())->GetName(),
 581                            Type::Find (deployment, value->GetKind())->GetName());
 582 #endif
 583
 584         g_hash_table_insert (auto_values, property, value);
 585
 586         MoonError error;
 587         obj->ProviderValueChanged (precedence, property, NULL, value, false, true, &error);
 588
 589         return value;
 590 }
 591
 592 Value *
 593 AutoCreatePropertyValueProvider::ReadLocalValue (DependencyProperty *property)
 594 {
 595         return (Value *) g_hash_table_lookup (auto_values, property);
 596 }
 597
 598 void
 599 AutoCreatePropertyValueProvider::ClearValue (DependencyProperty *property)
 600 {
 601         g_hash_table_remove (auto_values, property);
 602 }
 603
 604 Value*
 605 AutoCreators::default_autocreator (DependencyObject *instance, DependencyProperty *property)
 606 {
 607         Type *type = Type::Find (instance->GetDeployment (), property->GetPropertyType ());
 608         if (!type)
 609                 return NULL;
 610
 611         return Value::CreateUnrefPtr (type->CreateInstance ());
 612 }
 613
 614 #define XAML_FONT_SIZE    14.666666984558105
 615 #define XAP_FONT_SIZE     11.0
 616
 617 Value *
 618 AutoCreators::CreateDefaultFontSize (DependencyObject *obj, DependencyProperty *property)
 619 {
 620         Deployment *deployment;
 621
 622         if ((deployment = Deployment::GetCurrent ()) && deployment->IsLoadedFromXap ())
 623                 return new Value (XAP_FONT_SIZE);
 624
 625         return new Value (XAML_FONT_SIZE);
 626 }
 627