diff options
Diffstat (limited to 'src/qml/qml/qqmlcontextdata.cpp')
| -rw-r--r-- | src/qml/qml/qqmlcontextdata.cpp | 346 |
1 files changed, 346 insertions, 0 deletions
diff --git a/src/qml/qml/qqmlcontextdata.cpp b/src/qml/qml/qqmlcontextdata.cpp new file mode 100644 index 0000000000..8667a1ce81 --- /dev/null +++ b/src/qml/qml/qqmlcontextdata.cpp @@ -0,0 +1,346 @@ +// Copyright (C) 2020 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only + +#include "qqmlcontextdata_p.h" + +#include <QtQml/qqmlengine.h> +#include <QtQml/private/qqmlcomponentattached_p.h> +#include <QtQml/private/qqmljavascriptexpression_p.h> +#include <QtQml/private/qqmlguardedcontextdata_p.h> + +QT_BEGIN_NAMESPACE + +void QQmlContextData::installContext(QQmlData *ddata, QQmlContextData::QmlObjectKind kind) +{ + Q_ASSERT(ddata); + if (kind == QQmlContextData::DocumentRoot) { + if (ddata->context) { + Q_ASSERT(ddata->context != this); + Q_ASSERT(ddata->outerContext); + Q_ASSERT(ddata->outerContext != this); + QQmlRefPointer<QQmlContextData> c = ddata->context; + while (QQmlRefPointer<QQmlContextData> linked = c->linkedContext()) + c = linked; + c->setLinkedContext(this); + } else { + ddata->context = this; + } + ddata->ownContext.reset(ddata->context); + } else if (!ddata->context) { + ddata->context = this; + } + + addOwnedObject(ddata); +} + +QUrl QQmlContextData::resolvedUrl(const QUrl &src) const +{ + QUrl resolved; + if (src.isRelative() && !src.isEmpty()) { + const QUrl ownUrl = url(); + if (ownUrl.isValid()) { + resolved = ownUrl.resolved(src); + } else { + for (QQmlRefPointer<QQmlContextData> ctxt = parent(); ctxt; ctxt = ctxt->parent()) { + const QUrl ctxtUrl = ctxt->url(); + if (ctxtUrl.isValid()) { + resolved = ctxtUrl.resolved(src); + break; + } + } + + if (m_engine && resolved.isEmpty()) + resolved = m_engine->baseUrl().resolved(src); + } + } else { + resolved = src; + } + + if (resolved.isEmpty()) //relative but no ctxt + return resolved; + + return m_engine ? m_engine->interceptUrl(resolved, QQmlAbstractUrlInterceptor::UrlString) + : resolved; +} + +void QQmlContextData::emitDestruction() +{ + if (!m_hasEmittedDestruction) { + m_hasEmittedDestruction = true; + + // Emit the destruction signal - must be emitted before invalidate so that the + // context is still valid if bindings or resultant expression evaluation requires it + if (m_engine) { + while (m_componentAttacheds) { + QQmlComponentAttached *attached = m_componentAttacheds; + attached->removeFromList(); + emit attached->destruction(); + } + + for (QQmlRefPointer<QQmlContextData> child = m_childContexts; !child.isNull(); child = child->m_nextChild) + child->emitDestruction(); + } + } +} + +void QQmlContextData::invalidate() +{ + emitDestruction(); + + while (m_childContexts) { + Q_ASSERT(m_childContexts != this); + m_childContexts->invalidate(); + } + + if (m_prevChild) { + *m_prevChild = m_nextChild; + if (m_nextChild) m_nextChild->m_prevChild = m_prevChild; + m_nextChild = nullptr; + m_prevChild = nullptr; + } + + m_importedScripts.clear(); + + m_engine = nullptr; + clearParent(); +} + +void QQmlContextData::clearContextRecursively() +{ + clearContext(); + + for (auto ctxIt = m_childContexts; ctxIt; ctxIt = ctxIt->m_nextChild) + ctxIt->clearContextRecursively(); +} + +void QQmlContextData::clearContext() +{ + emitDestruction(); + + QQmlJavaScriptExpression *expression = m_expressions; + while (expression) { + QQmlJavaScriptExpression *nextExpression = expression->m_nextExpression; + + expression->m_prevExpression = nullptr; + expression->m_nextExpression = nullptr; + + expression->setContext(nullptr); + + expression = nextExpression; + } + m_expressions = nullptr; +} + +QQmlContextData::~QQmlContextData() +{ + Q_ASSERT(refCount() == 0); + + // avoid recursion + addref(); + if (m_engine) + invalidate(); + m_linkedContext.reset(); + + Q_ASSERT(refCount() == 1); + clearContext(); + Q_ASSERT(refCount() == 1); + + while (m_ownedObjects) { + QQmlData *co = m_ownedObjects; + m_ownedObjects = m_ownedObjects->nextContextObject; + + if (co->context == this) + co->context = nullptr; + co->outerContext = nullptr; + co->nextContextObject = nullptr; + co->prevContextObject = nullptr; + } + Q_ASSERT(refCount() == 1); + + QQmlGuardedContextData *contextGuard = m_contextGuards; + while (contextGuard) { + // TODO: Is this dead code? Why? + QQmlGuardedContextData *next = contextGuard->next(); + contextGuard->setContextData({}); + contextGuard = next; + } + m_contextGuards = nullptr; + Q_ASSERT(refCount() == 1); + + delete [] m_idValues; + m_idValues = nullptr; + + Q_ASSERT(refCount() == 1); + if (m_publicContext) + delete m_publicContext; + + Q_ASSERT(refCount() == 1); +} + +void QQmlContextData::refreshExpressionsRecursive(QQmlJavaScriptExpression *expression) +{ + QQmlJavaScriptExpression::DeleteWatcher w(expression); + + if (expression->m_nextExpression) + refreshExpressionsRecursive(expression->m_nextExpression); + + if (!w.wasDeleted()) + expression->refresh(); +} + +void QQmlContextData::refreshExpressionsRecursive(bool isGlobal) +{ + // For efficiency, we try and minimize the number of guards we have to create + if (hasExpressionsToRun(isGlobal) && (m_nextChild || m_childContexts)) { + QQmlGuardedContextData guard(this); + + if (m_childContexts) + m_childContexts->refreshExpressionsRecursive(isGlobal); + + if (guard.isNull()) return; + + if (m_nextChild) + m_nextChild->refreshExpressionsRecursive(isGlobal); + + if (guard.isNull()) return; + + if (hasExpressionsToRun(isGlobal)) + refreshExpressionsRecursive(m_expressions); + + } else if (hasExpressionsToRun(isGlobal)) { + refreshExpressionsRecursive(m_expressions); + } else if (m_nextChild && m_childContexts) { + QQmlGuardedContextData guard(this); + m_childContexts->refreshExpressionsRecursive(isGlobal); + if (!guard.isNull() && m_nextChild) + m_nextChild->refreshExpressionsRecursive(isGlobal); + } else if (m_nextChild) { + m_nextChild->refreshExpressionsRecursive(isGlobal); + } else if (m_childContexts) { + m_childContexts->refreshExpressionsRecursive(isGlobal); + } +} + +// Refreshes all expressions that could possibly depend on this context. Refreshing flushes all +// context-tree dependent caches in the expressions, and should occur every time the context tree +// *structure* (not values) changes. +void QQmlContextData::refreshExpressions() +{ + bool isGlobal = (m_parent == nullptr); + + // For efficiency, we try and minimize the number of guards we have to create + if (hasExpressionsToRun(isGlobal) && m_childContexts) { + QQmlGuardedContextData guard(this); + m_childContexts->refreshExpressionsRecursive(isGlobal); + if (!guard.isNull() && hasExpressionsToRun(isGlobal)) + refreshExpressionsRecursive(m_expressions); + } else if (hasExpressionsToRun(isGlobal)) { + refreshExpressionsRecursive(m_expressions); + } else if (m_childContexts) { + m_childContexts->refreshExpressionsRecursive(isGlobal); + } +} + +void QQmlContextData::addOwnedObject(QQmlData *data) +{ + if (data->outerContext) { + if (data->nextContextObject) + data->nextContextObject->prevContextObject = data->prevContextObject; + if (data->prevContextObject) + *data->prevContextObject = data->nextContextObject; + else if (data->outerContext->m_ownedObjects == data) + data->outerContext->m_ownedObjects = data->nextContextObject; + } + + data->outerContext = this; + + data->nextContextObject = m_ownedObjects; + if (data->nextContextObject) + data->nextContextObject->prevContextObject = &data->nextContextObject; + data->prevContextObject = &m_ownedObjects; + m_ownedObjects = data; +} + +void QQmlContextData::setIdValue(int idx, QObject *obj) +{ + m_idValues[idx] = obj; + m_idValues[idx].setContext(this); +} + +QString QQmlContextData::findObjectId(const QObject *obj) const +{ + for (int ii = 0; ii < m_idValueCount; ii++) { + if (m_idValues[ii] == obj) + return propertyName(ii); + } + + const QVariant objVariant = QVariant::fromValue(obj); + if (m_publicContext) { + QQmlContextPrivate *p = QQmlContextPrivate::get(m_publicContext); + for (int ii = 0; ii < p->numPropertyValues(); ++ii) + if (p->propertyValue(ii) == objVariant) + return propertyName(ii); + } + + if (m_contextObject) { + // This is expensive, but nameForObject should really mirror contextProperty() + for (const QMetaObject *metaObject = m_contextObject->metaObject(); + metaObject; metaObject = metaObject->superClass()) { + for (int i = metaObject->propertyOffset(), end = metaObject->propertyCount(); + i != end; ++i) { + const QMetaProperty prop = metaObject->property(i); + if (prop.metaType().flags() & QMetaType::PointerToQObject + && prop.read(m_contextObject) == objVariant) { + return QString::fromUtf8(prop.name()); + } + } + } + } + + return QString(); +} + +void QQmlContextData::initFromTypeCompilationUnit(const QQmlRefPointer<QV4::ExecutableCompilationUnit> &unit, int subComponentIndex) +{ + m_typeCompilationUnit = unit; + m_componentObjectIndex = subComponentIndex == -1 ? /*root object*/0 : subComponentIndex; + Q_ASSERT(!m_idValues); + m_idValueCount = m_typeCompilationUnit->objectAt(m_componentObjectIndex) + ->nNamedObjectsInComponent; + m_idValues = new ContextGuard[m_idValueCount]; +} + +void QQmlContextData::addComponentAttached(QQmlComponentAttached *attached) +{ + attached->insertIntoList(&m_componentAttacheds); +} + +void QQmlContextData::addExpression(QQmlJavaScriptExpression *expression) +{ + expression->insertIntoList(&m_expressions); +} + +void QQmlContextData::initPropertyNames() const +{ + if (m_typeCompilationUnit) + m_propertyNameCache = m_typeCompilationUnit->namedObjectsPerComponent(m_componentObjectIndex); + else + m_propertyNameCache = QV4::IdentifierHash(m_engine->handle()); + Q_ASSERT(!m_propertyNameCache.isEmpty()); +} + +QUrl QQmlContextData::url() const +{ + if (m_typeCompilationUnit) + return m_typeCompilationUnit->finalUrl(); + return m_baseUrl; +} + +QString QQmlContextData::urlString() const +{ + if (m_typeCompilationUnit) + return m_typeCompilationUnit->finalUrlString(); + return m_baseUrlString; +} + +QT_END_NAMESPACE |