src/declarative/debugger/qdeclarativeenginedebugservice.cpp

   1 /****************************************************************************
   2 **
   3 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
   4 ** All rights reserved.
   5 ** Contact: Nokia Corporation (qt-info@nokia.com)
   6 **
   7 ** This file is part of the QtDeclarative module of the Qt Toolkit.
   8 **
   9 ** $QT_BEGIN_LICENSE:LGPL$
  10 ** GNU Lesser General Public License Usage
  11 ** This file may be used under the terms of the GNU Lesser General Public
  12 ** License version 2.1 as published by the Free Software Foundation and
  13 ** appearing in the file LICENSE.LGPL included in the packaging of this
  14 ** file. Please review the following information to ensure the GNU Lesser
  15 ** General Public License version 2.1 requirements will be met:
  16 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
  17 **
  18 ** In addition, as a special exception, Nokia gives you certain additional
  19 ** rights. These rights are described in the Nokia Qt LGPL Exception
  20 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
  21 **
  22 ** GNU General Public License Usage
  23 ** Alternatively, this file may be used under the terms of the GNU General
  24 ** Public License version 3.0 as published by the Free Software Foundation
  25 ** and appearing in the file LICENSE.GPL included in the packaging of this
  26 ** file. Please review the following information to ensure the GNU General
  27 ** Public License version 3.0 requirements will be met:
  28 ** http://www.gnu.org/copyleft/gpl.html.
  29 **
  30 ** Other Usage
  31 ** Alternatively, this file may be used in accordance with the terms and
  32 ** conditions contained in a signed written agreement between you and Nokia.
  33 **
  34 **
  35 **
  36 **
  37 **
  38 ** $QT_END_LICENSE$
  39 **
  40 ****************************************************************************/
  41
  42 #include "private/qdeclarativeenginedebugservice_p.h"
  43
  44 #include "private/qdeclarativeboundsignal_p.h"
  45 #include "qdeclarativeengine.h"
  46 #include "private/qdeclarativemetatype_p.h"
  47 #include "qdeclarativeproperty.h"
  48 #include "private/qdeclarativeproperty_p.h"
  49 #include "private/qdeclarativebinding_p.h"
  50 #include "private/qdeclarativecontext_p.h"
  51 #include "private/qdeclarativewatcher_p.h"
  52 #include "private/qdeclarativevaluetype_p.h"
  53 #include "private/qdeclarativevmemetaobject_p.h"
  54 #include "private/qdeclarativeexpression_p.h"
  55 #include "private/qdeclarativepropertychanges_p.h"
  56
  57 #include <QtCore/qdebug.h>
  58 #include <QtCore/qmetaobject.h>
  59
  60 QT_BEGIN_NAMESPACE
  61
  62 Q_GLOBAL_STATIC(QDeclarativeEngineDebugService, qmlEngineDebugService);
  63
  64 QDeclarativeEngineDebugService *QDeclarativeEngineDebugService::instance()
  65 {
  66     return qmlEngineDebugService();
  67 }
  68
  69 QDeclarativeEngineDebugService::QDeclarativeEngineDebugService(QObject *parent)
  70 : QDeclarativeDebugService(QLatin1String("QDeclarativeEngine"), parent),
  71     m_watch(new QDeclarativeWatcher(this))
  72 {
  73     QObject::connect(m_watch, SIGNAL(propertyChanged(int,int,QMetaProperty,QVariant)),
  74                      this, SLOT(propertyChanged(int,int,QMetaProperty,QVariant)));
  75 }
  76
  77 QDataStream &operator<<(QDataStream &ds,
  78                         const QDeclarativeEngineDebugService::QDeclarativeObjectData &data)
  79 {
  80     ds << data.url << data.lineNumber << data.columnNumber << data.idString
  81        << data.objectName << data.objectType << data.objectId << data.contextId;
  82     return ds;
  83 }
  84
  85 QDataStream &operator>>(QDataStream &ds,
  86                         QDeclarativeEngineDebugService::QDeclarativeObjectData &data)
  87 {
  88     ds >> data.url >> data.lineNumber >> data.columnNumber >> data.idString
  89        >> data.objectName >> data.objectType >> data.objectId >> data.contextId;
  90     return ds;
  91 }
  92
  93 QDataStream &operator<<(QDataStream &ds,
  94                         const QDeclarativeEngineDebugService::QDeclarativeObjectProperty &data)
  95 {
  96     ds << (int)data.type << data.name << data.value << data.valueTypeName
  97        << data.binding << data.hasNotifySignal;
  98     return ds;
  99 }
 100
 101 QDataStream &operator>>(QDataStream &ds,
 102                         QDeclarativeEngineDebugService::QDeclarativeObjectProperty &data)
 103 {
 104     int type;
 105     ds >> type >> data.name >> data.value >> data.valueTypeName
 106        >> data.binding >> data.hasNotifySignal;
 107     data.type = (QDeclarativeEngineDebugService::QDeclarativeObjectProperty::Type)type;
 108     return ds;
 109 }
 110
 111 static inline bool isSignalPropertyName(const QString &signalName)
 112 {
 113     // see QmlCompiler::isSignalPropertyName
 114     return signalName.length() >= 3 && signalName.startsWith(QLatin1String("on")) &&
 115            signalName.at(2).isLetter() && signalName.at(2).isUpper();
 116 }
 117
 118 static bool hasValidSignal(QObject *object, const QString &propertyName)
 119 {
 120     if (!isSignalPropertyName(propertyName))
 121         return false;
 122
 123     QString signalName = propertyName.mid(2);
 124     signalName[0] = signalName.at(0).toLower();
 125
 126     int sigIdx = QDeclarativePropertyPrivate::findSignalByName(object->metaObject(), signalName.toLatin1()).methodIndex();
 127
 128     if (sigIdx == -1)
 129         return false;
 130
 131     return true;
 132 }
 133
 134 QDeclarativeEngineDebugService::QDeclarativeObjectProperty
 135 QDeclarativeEngineDebugService::propertyData(QObject *obj, int propIdx)
 136 {
 137     QDeclarativeObjectProperty rv;
 138
 139     QMetaProperty prop = obj->metaObject()->property(propIdx);
 140
 141     rv.type = QDeclarativeObjectProperty::Unknown;
 142     rv.valueTypeName = QString::fromUtf8(prop.typeName());
 143     rv.name = QString::fromUtf8(prop.name());
 144     rv.hasNotifySignal = prop.hasNotifySignal();
 145     QDeclarativeAbstractBinding *binding =
 146         QDeclarativePropertyPrivate::binding(QDeclarativeProperty(obj, rv.name));
 147     if (binding)
 148         rv.binding = binding->expression();
 149
 150     if (QDeclarativeValueTypeFactory::isValueType(prop.userType())) {
 151         rv.type = QDeclarativeObjectProperty::Basic;
 152     } else if (QDeclarativeMetaType::isQObject(prop.userType()))  {
 153         rv.type = QDeclarativeObjectProperty::Object;
 154     } else if (QDeclarativeMetaType::isList(prop.userType())) {
 155         rv.type = QDeclarativeObjectProperty::List;
 156     }
 157
 158     QVariant value;
 159     if (rv.type != QDeclarativeObjectProperty::Unknown && prop.userType() != 0) {
 160         value = prop.read(obj);
 161     }
 162     rv.value = valueContents(value);
 163
 164     return rv;
 165 }
 166
 167 QVariant QDeclarativeEngineDebugService::valueContents(const QVariant &value) const
 168 {
 169     int userType = value.userType();
 170
 171     if (value.type() == QVariant::List) {
 172         QVariantList contents;
 173         QVariantList list = value.toList();
 174         int count = list.size();
 175         for (int i = 0; i < count; i++)
 176             contents << valueContents(list.at(i));
 177         return contents;
 178     }
 179
 180     if (QDeclarativeValueTypeFactory::isValueType(userType))
 181         return value;
 182
 183     if (QDeclarativeMetaType::isQObject(userType)) {
 184         QObject *o = QDeclarativeMetaType::toQObject(value);
 185         if (o) {
 186             QString name = o->objectName();
 187             if (name.isEmpty())
 188                 name = QLatin1String("<unnamed object>");
 189             return name;
 190         }
 191     }
 192
 193     return QLatin1String("<unknown value>");
 194 }
 195
 196 void QDeclarativeEngineDebugService::buildObjectDump(QDataStream &message,
 197                                            QObject *object, bool recur, bool dumpProperties)
 198 {
 199     message << objectData(object);
 200
 201     QObjectList children = object->children();
 202
 203     int childrenCount = children.count();
 204     for (int ii = 0; ii < children.count(); ++ii) {
 205         if (qobject_cast<QDeclarativeContext*>(children[ii]) || QDeclarativeBoundSignal::cast(children[ii]))
 206             --childrenCount;
 207     }
 208
 209     message << childrenCount << recur;
 210
 211     QList<QDeclarativeObjectProperty> fakeProperties;
 212
 213     for (int ii = 0; ii < children.count(); ++ii) {
 214         QObject *child = children.at(ii);
 215         if (qobject_cast<QDeclarativeContext*>(child))
 216             continue;
 217         QDeclarativeBoundSignal *signal = QDeclarativeBoundSignal::cast(child);
 218         if (signal) {
 219             if (!dumpProperties)
 220                 continue;
 221             QDeclarativeObjectProperty prop;
 222             prop.type = QDeclarativeObjectProperty::SignalProperty;
 223             prop.hasNotifySignal = false;
 224             QDeclarativeExpression *expr = signal->expression();
 225             if (expr) {
 226                 prop.value = expr->expression();
 227                 QObject *scope = expr->scopeObject();
 228                 if (scope) {
 229                     QString sig = QLatin1String(scope->metaObject()->method(signal->index()).signature());
 230                     int lparen = sig.indexOf(QLatin1Char('('));
 231                     if (lparen >= 0) {
 232                         QString methodName = sig.mid(0, lparen);
 233                         prop.name = QLatin1String("on") + methodName[0].toUpper()
 234                                 + methodName.mid(1);
 235                     }
 236                 }
 237             }
 238             fakeProperties << prop;
 239         } else {
 240             if (recur)
 241                 buildObjectDump(message, child, recur, dumpProperties);
 242             else
 243                 message << objectData(child);
 244         }
 245     }
 246
 247     if (!dumpProperties) {
 248         message << 0;
 249         return;
 250     }
 251
 252     QList<int> propertyIndexes;
 253     for (int ii = 0; ii < object->metaObject()->propertyCount(); ++ii) {
 254         if (object->metaObject()->property(ii).isScriptable())
 255             propertyIndexes << ii;
 256     }
 257
 258     message << propertyIndexes.size() + fakeProperties.count();
 259
 260     for (int ii = 0; ii < propertyIndexes.size(); ++ii)
 261         message << propertyData(object, propertyIndexes.at(ii));
 262
 263     for (int ii = 0; ii < fakeProperties.count(); ++ii)
 264         message << fakeProperties[ii];
 265 }
 266
 267 void QDeclarativeEngineDebugService::prepareDeferredObjects(QObject *obj)
 268 {
 269     qmlExecuteDeferred(obj);
 270
 271     QObjectList children = obj->children();
 272     for (int ii = 0; ii < children.count(); ++ii) {
 273         QObject *child = children.at(ii);
 274         prepareDeferredObjects(child);
 275     }
 276
 277 }
 278
 279 void QDeclarativeEngineDebugService::buildObjectList(QDataStream &message, QDeclarativeContext *ctxt)
 280 {
 281     QDeclarativeContextData *p = QDeclarativeContextData::get(ctxt);
 282
 283     QString ctxtName = ctxt->objectName();
 284     int ctxtId = QDeclarativeDebugService::idForObject(ctxt);
 285
 286     message << ctxtName << ctxtId;
 287
 288     int count = 0;
 289
 290     QDeclarativeContextData *child = p->childContexts;
 291     while (child) {
 292         ++count;
 293         child = child->nextChild;
 294     }
 295
 296     message << count;
 297
 298     child = p->childContexts;
 299     while (child) {
 300         buildObjectList(message, child->asQDeclarativeContext());
 301         child = child->nextChild;
 302     }
 303
 304     // Clean deleted objects
 305     QDeclarativeContextPrivate *ctxtPriv = QDeclarativeContextPrivate::get(ctxt);
 306     for (int ii = 0; ii < ctxtPriv->instances.count(); ++ii) {
 307         if (!ctxtPriv->instances.at(ii)) {
 308             ctxtPriv->instances.removeAt(ii);
 309             --ii;
 310         }
 311     }
 312
 313     message << ctxtPriv->instances.count();
 314     for (int ii = 0; ii < ctxtPriv->instances.count(); ++ii) {
 315         message << objectData(ctxtPriv->instances.at(ii));
 316     }
 317 }
 318
 319 void QDeclarativeEngineDebugService::buildStatesList(QDeclarativeContext *ctxt, bool cleanList=false)
 320 {
 321     if (cleanList)
 322         m_allStates.clear();
 323
 324     QDeclarativeContextPrivate *ctxtPriv = QDeclarativeContextPrivate::get(ctxt);
 325     for (int ii = 0; ii < ctxtPriv->instances.count(); ++ii) {
 326         buildStatesList(ctxtPriv->instances.at(ii));
 327     }
 328
 329     QDeclarativeContextData *child = QDeclarativeContextData::get(ctxt)->childContexts;
 330     while (child) {
 331         buildStatesList(child->asQDeclarativeContext());
 332         child = child->nextChild;
 333     }
 334 }
 335
 336 void QDeclarativeEngineDebugService::buildStatesList(QObject *obj)
 337 {
 338     if (QDeclarativeState *state = qobject_cast<QDeclarativeState *>(obj)) {
 339             m_allStates.append(state);
 340     }
 341
 342     QObjectList children = obj->children();
 343     for (int ii = 0; ii < children.count(); ++ii) {
 344         buildStatesList(children.at(ii));
 345     }
 346 }
 347
 348 QDeclarativeEngineDebugService::QDeclarativeObjectData
 349 QDeclarativeEngineDebugService::objectData(QObject *object)
 350 {
 351     QDeclarativeData *ddata = QDeclarativeData::get(object);
 352     QDeclarativeObjectData rv;
 353     if (ddata && ddata->outerContext) {
 354         rv.url = ddata->outerContext->url;
 355         rv.lineNumber = ddata->lineNumber;
 356         rv.columnNumber = ddata->columnNumber;
 357     } else {
 358         rv.lineNumber = -1;
 359         rv.columnNumber = -1;
 360     }
 361
 362     QDeclarativeContext *context = qmlContext(object);
 363     if (context) {
 364         QDeclarativeContextData *cdata = QDeclarativeContextData::get(context);
 365         if (cdata)
 366             rv.idString = cdata->findObjectId(object);
 367     }
 368
 369     rv.objectName = object->objectName();
 370     rv.objectId = QDeclarativeDebugService::idForObject(object);
 371     rv.contextId = QDeclarativeDebugService::idForObject(qmlContext(object));
 372
 373     QDeclarativeType *type = QDeclarativeMetaType::qmlType(object->metaObject());
 374     if (type) {
 375         QString typeName = QLatin1String(type->qmlTypeName());
 376         int lastSlash = typeName.lastIndexOf(QLatin1Char('/'));
 377         rv.objectType = lastSlash < 0 ? typeName : typeName.mid(lastSlash+1);
 378     } else {
 379         rv.objectType = QString::fromUtf8(object->metaObject()->className());
 380         int marker = rv.objectType.indexOf(QLatin1String("_QMLTYPE_"));
 381         if (marker != -1)
 382             rv.objectType = rv.objectType.left(marker);
 383     }
 384
 385     return rv;
 386 }
 387
 388 void QDeclarativeEngineDebugService::messageReceived(const QByteArray &message)
 389 {
 390     QDataStream ds(message);
 391
 392     QByteArray type;
 393     ds >> type;
 394
 395     if (type == "LIST_ENGINES") {
 396         int queryId;
 397         ds >> queryId;
 398
 399         QByteArray reply;
 400         QDataStream rs(&reply, QIODevice::WriteOnly);
 401         rs << QByteArray("LIST_ENGINES_R");
 402         rs << queryId << m_engines.count();
 403
 404         for (int ii = 0; ii < m_engines.count(); ++ii) {
 405             QDeclarativeEngine *engine = m_engines.at(ii);
 406
 407             QString engineName = engine->objectName();
 408             int engineId = QDeclarativeDebugService::idForObject(engine);
 409
 410             rs << engineName << engineId;
 411         }
 412
 413         sendMessage(reply);
 414     } else if (type == "LIST_OBJECTS") {
 415         int queryId;
 416         int engineId = -1;
 417         ds >> queryId >> engineId;
 418
 419         QDeclarativeEngine *engine =
 420             qobject_cast<QDeclarativeEngine *>(QDeclarativeDebugService::objectForId(engineId));
 421
 422         QByteArray reply;
 423         QDataStream rs(&reply, QIODevice::WriteOnly);
 424         rs << QByteArray("LIST_OBJECTS_R") << queryId;
 425
 426         if (engine) {
 427             buildObjectList(rs, engine->rootContext());
 428             buildStatesList(engine->rootContext(), true);
 429         }
 430
 431         sendMessage(reply);
 432     } else if (type == "FETCH_OBJECT") {
 433         int queryId;
 434         int objectId;
 435         bool recurse;
 436         bool dumpProperties = true;
 437
 438         ds >> queryId >> objectId >> recurse >> dumpProperties;
 439
 440         QObject *object = QDeclarativeDebugService::objectForId(objectId);
 441
 442         QByteArray reply;
 443         QDataStream rs(&reply, QIODevice::WriteOnly);
 444         rs << QByteArray("FETCH_OBJECT_R") << queryId;
 445
 446         if (object) {
 447             if (recurse)
 448                 prepareDeferredObjects(object);
 449             buildObjectDump(rs, object, recurse, dumpProperties);
 450         }
 451
 452         sendMessage(reply);
 453     } else if (type == "WATCH_OBJECT") {
 454         int queryId;
 455         int objectId;
 456
 457         ds >> queryId >> objectId;
 458         bool ok = m_watch->addWatch(queryId, objectId);
 459
 460         QByteArray reply;
 461         QDataStream rs(&reply, QIODevice::WriteOnly);
 462         rs << QByteArray("WATCH_OBJECT_R") << queryId << ok;
 463
 464         sendMessage(reply);
 465     } else if (type == "WATCH_PROPERTY") {
 466         int queryId;
 467         int objectId;
 468         QByteArray property;
 469
 470         ds >> queryId >> objectId >> property;
 471         bool ok = m_watch->addWatch(queryId, objectId, property);
 472
 473         QByteArray reply;
 474         QDataStream rs(&reply, QIODevice::WriteOnly);
 475         rs << QByteArray("WATCH_PROPERTY_R") << queryId << ok;
 476
 477         sendMessage(reply);
 478     } else if (type == "WATCH_EXPR_OBJECT") {
 479         int queryId;
 480         int debugId;
 481         QString expr;
 482
 483         ds >> queryId >> debugId >> expr;
 484         bool ok = m_watch->addWatch(queryId, debugId, expr);
 485
 486         QByteArray reply;
 487         QDataStream rs(&reply, QIODevice::WriteOnly);
 488         rs << QByteArray("WATCH_EXPR_OBJECT_R") << queryId << ok;
 489         sendMessage(reply);
 490     } else if (type == "NO_WATCH") {
 491         int queryId;
 492
 493         ds >> queryId;
 494         m_watch->removeWatch(queryId);
 495     } else if (type == "EVAL_EXPRESSION") {
 496         int queryId;
 497         int objectId;
 498         QString expr;
 499
 500         ds >> queryId >> objectId >> expr;
 501
 502         QObject *object = QDeclarativeDebugService::objectForId(objectId);
 503         QDeclarativeContext *context = qmlContext(object);
 504         QVariant result;
 505         if (object && context) {
 506             QDeclarativeExpression exprObj(context, object, expr);
 507             bool undefined = false;
 508             QVariant value = exprObj.evaluate(&undefined);
 509             if (undefined)
 510                 result = QLatin1String("<undefined>");
 511             else
 512                 result = valueContents(value);
 513         } else {
 514             result = QLatin1String("<unknown context>");
 515         }
 516
 517         QByteArray reply;
 518         QDataStream rs(&reply, QIODevice::WriteOnly);
 519         rs << QByteArray("EVAL_EXPRESSION_R") << queryId << result;
 520
 521         sendMessage(reply);
 522     } else if (type == "SET_BINDING") {
 523         int objectId;
 524         QString propertyName;
 525         QVariant expr;
 526         bool isLiteralValue;
 527         QString filename;
 528         int line;
 529         ds >> objectId >> propertyName >> expr >> isLiteralValue;
 530         if (!ds.atEnd()) { // backward compatibility from 2.1, 2.2
 531             ds >> filename >> line;
 532         }
 533         setBinding(objectId, propertyName, expr, isLiteralValue, filename, line);
 534     } else if (type == "RESET_BINDING") {
 535         int objectId;
 536         QString propertyName;
 537         ds >> objectId >> propertyName;
 538         resetBinding(objectId, propertyName);
 539     } else if (type == "SET_METHOD_BODY") {
 540         int objectId;
 541         QString methodName;
 542         QString methodBody;
 543         ds >> objectId >> methodName >> methodBody;
 544         setMethodBody(objectId, methodName, methodBody);
 545     }
 546 }
 547
 548 void QDeclarativeEngineDebugService::setBinding(int objectId,
 549                                                const QString &propertyName,
 550                                                const QVariant &expression,
 551                                                bool isLiteralValue,
 552                                                QString filename,
 553                                                int line)
 554 {
 555     QObject *object = objectForId(objectId);
 556     QDeclarativeContext *context = qmlContext(object);
 557
 558     if (object && context) {
 559         QDeclarativeProperty property(object, propertyName, context);
 560         if (property.isValid()) {
 561
 562             bool inBaseState = true;
 563
 564             foreach(QWeakPointer<QDeclarativeState> statePointer, m_allStates) {
 565                 if (QDeclarativeState *state = statePointer.data()) {
 566                     // here we assume that the revert list on itself defines the base state
 567                     if (state->isStateActive() && state->containsPropertyInRevertList(object, propertyName)) {
 568                         inBaseState = false;
 569
 570                         QDeclarativeBinding *newBinding = 0;
 571                         if (!isLiteralValue) {
 572                             newBinding = new QDeclarativeBinding(expression.toString(), object, context);
 573                             newBinding->setTarget(property);
 574                             newBinding->setNotifyOnValueChanged(true);
 575                             newBinding->setSourceLocation(filename, line);
 576                         }
 577
 578                         state->changeBindingInRevertList(object, propertyName, newBinding);
 579
 580                         if (isLiteralValue)
 581                             state->changeValueInRevertList(object, propertyName, expression);
 582                     }
 583                 }
 584             }
 585
 586             if (inBaseState) {
 587                 if (isLiteralValue) {
 588                     property.write(expression);
 589                 } else if (hasValidSignal(object, propertyName)) {
 590                     QDeclarativeExpression *declarativeExpression = new QDeclarativeExpression(context, object, expression.toString());
 591                     QDeclarativePropertyPrivate::setSignalExpression(property, declarativeExpression);
 592                     declarativeExpression->setSourceLocation(filename, line);
 593                 } else if (property.isProperty()) {
 594                     QDeclarativeBinding *binding = new QDeclarativeBinding(expression.toString(), object, context);
 595                     binding->setTarget(property);
 596                     binding->setSourceLocation(filename, line);
 597                     binding->setNotifyOnValueChanged(true);
 598                     QDeclarativeAbstractBinding *oldBinding = QDeclarativePropertyPrivate::setBinding(property, binding);
 599                     if (oldBinding)
 600                         oldBinding->destroy();
 601                     binding->update();
 602                 } else {
 603                     qWarning() << "QDeclarativeEngineDebugService::setBinding: unable to set property" << propertyName << "on object" << object;
 604                 }
 605             }
 606
 607         } else {
 608             // not a valid property
 609             if (QDeclarativePropertyChanges *propertyChanges = qobject_cast<QDeclarativePropertyChanges *>(object)) {
 610                 if (isLiteralValue) {
 611                     propertyChanges->changeValue(propertyName, expression);
 612                 } else {
 613                     propertyChanges->changeExpression(propertyName, expression.toString());
 614                 }
 615             } else {
 616                 qWarning() << "QDeclarativeEngineDebugService::setBinding: unable to set property" << propertyName << "on object" << object;
 617             }
 618         }
 619     }
 620 }
 621
 622 void QDeclarativeEngineDebugService::resetBinding(int objectId, const QString &propertyName)
 623 {
 624     QObject *object = objectForId(objectId);
 625     QDeclarativeContext *context = qmlContext(object);
 626
 627     if (object && context) {
 628         if (object->property(propertyName.toLatin1()).isValid()) {
 629             QDeclarativeProperty property(object, propertyName);
 630             QDeclarativeAbstractBinding *oldBinding = QDeclarativePropertyPrivate::binding(property);
 631             if (oldBinding) {
 632                 QDeclarativeAbstractBinding *oldBinding = QDeclarativePropertyPrivate::setBinding(property, 0);
 633                 if (oldBinding)
 634                     oldBinding->destroy();
 635             }
 636             if (property.isResettable()) {
 637                 // Note: this will reset the property in any case, without regard to states
 638                 // Right now almost no QDeclarativeItem has reset methods for its properties (with the
 639                 // notable exception of QDeclarativeAnchors), so this is not a big issue
 640                 // later on, setBinding does take states into account
 641                 property.reset();
 642             } else {
 643                 // overwrite with default value
 644                 if (QDeclarativeType *objType = QDeclarativeMetaType::qmlType(object->metaObject())) {
 645                     if (QObject *emptyObject = objType->create()) {
 646                         if (emptyObject->property(propertyName.toLatin1()).isValid()) {
 647                             QVariant defaultValue = QDeclarativeProperty(emptyObject, propertyName).read();
 648                             if (defaultValue.isValid()) {
 649                                 setBinding(objectId, propertyName, defaultValue, true);
 650                             }
 651                         }
 652                         delete emptyObject;
 653                     }
 654                 }
 655             }
 656         } else if (hasValidSignal(object, propertyName)) {
 657             QDeclarativeProperty property(object, propertyName, context);
 658             QDeclarativePropertyPrivate::setSignalExpression(property, 0);
 659     } else {
 660             if (QDeclarativePropertyChanges *propertyChanges = qobject_cast<QDeclarativePropertyChanges *>(object)) {
 661                 propertyChanges->removeProperty(propertyName);
 662             }
 663         }
 664     }
 665 }
 666
 667 void QDeclarativeEngineDebugService::setMethodBody(int objectId, const QString &method, const QString &body)
 668 {
 669     QObject *object = objectForId(objectId);
 670     QDeclarativeContext *context = qmlContext(object);
 671     if (!object || !context || !context->engine())
 672         return;
 673     QDeclarativeContextData *contextData = QDeclarativeContextData::get(context);
 674     if (!contextData)
 675         return;
 676
 677     QDeclarativePropertyCache::Data dummy;
 678     QDeclarativePropertyCache::Data *prop =
 679         QDeclarativePropertyCache::property(context->engine(), object, method, dummy);
 680
 681     if (!prop || !prop->isVMEFunction())
 682         return;
 683
 684     QMetaMethod metaMethod = object->metaObject()->method(prop->coreIndex);
 685     QList<QByteArray> paramNames = metaMethod.parameterNames();
 686
 687     QString paramStr;
 688     for (int ii = 0; ii < paramNames.count(); ++ii) {
 689         if (ii != 0) paramStr.append(QLatin1String(","));
 690         paramStr.append(QString::fromUtf8(paramNames.at(ii)));
 691     }
 692
 693     QString jsfunction = QLatin1String("(function ") + method + QLatin1String("(") + paramStr +
 694                          QLatin1String(") {");
 695     jsfunction += body;
 696     jsfunction += QLatin1String("\n})");
 697
 698     QDeclarativeVMEMetaObject *vmeMetaObject =
 699         static_cast<QDeclarativeVMEMetaObject*>(QObjectPrivate::get(object)->metaObject);
 700     Q_ASSERT(vmeMetaObject); // the fact we found the property above should guarentee this
 701
 702     int lineNumber = vmeMetaObject->vmeMethodLineNumber(prop->coreIndex);
 703     vmeMetaObject->setVmeMethod(prop->coreIndex, QDeclarativeExpressionPrivate::evalFunction(contextData, object, jsfunction, contextData->url.toString(), lineNumber));
 704 }
 705
 706 void QDeclarativeEngineDebugService::propertyChanged(int id, int objectId, const QMetaProperty &property, const QVariant &value)
 707 {
 708     QByteArray reply;
 709     QDataStream rs(&reply, QIODevice::WriteOnly);
 710
 711     rs << QByteArray("UPDATE_WATCH") << id << objectId << QByteArray(property.name()) << valueContents(value);
 712
 713     sendMessage(reply);
 714 }
 715
 716 void QDeclarativeEngineDebugService::addEngine(QDeclarativeEngine *engine)
 717 {
 718     Q_ASSERT(engine);
 719     Q_ASSERT(!m_engines.contains(engine));
 720
 721     m_engines.append(engine);
 722 }
 723
 724 void QDeclarativeEngineDebugService::remEngine(QDeclarativeEngine *engine)
 725 {
 726     Q_ASSERT(engine);
 727     Q_ASSERT(m_engines.contains(engine));
 728
 729     m_engines.removeAll(engine);
 730 }
 731
 732 void QDeclarativeEngineDebugService::objectCreated(QDeclarativeEngine *engine, QObject *object)
 733 {
 734     Q_ASSERT(engine);
 735     Q_ASSERT(m_engines.contains(engine));
 736
 737     int engineId = QDeclarativeDebugService::idForObject(engine);
 738     int objectId = QDeclarativeDebugService::idForObject(object);
 739
 740     QByteArray reply;
 741     QDataStream rs(&reply, QIODevice::WriteOnly);
 742
 743     rs << QByteArray("OBJECT_CREATED") << engineId << objectId;
 744     sendMessage(reply);
 745 }
 746
 747 QT_END_NAMESPACE