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// Copyright (C) 2016 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 "qqmldelayedcallqueue_p.h"
#include <private/qqmlengine_p.h>
#include <private/qqmljavascriptexpression_p.h>
#include <private/qv4value_p.h>
#include <private/qv4jscall_p.h>
#include <private/qv4qobjectwrapper_p.h>
#include <private/qv4qmlcontext_p.h>
#include <QQmlError>
QT_BEGIN_NAMESPACE
//
// struct QQmlDelayedCallQueue::DelayedFunctionCall
//
void QQmlDelayedCallQueue::DelayedFunctionCall::execute(QV4::ExecutionEngine *engine) const
{
if (!m_guarded ||
(!m_objectGuard.isNull() &&
!QQmlData::wasDeleted(m_objectGuard) &&
QQmlData::get(m_objectGuard) &&
!QQmlData::get(m_objectGuard)->isQueuedForDeletion)) {
QV4::Scope scope(engine);
QV4::ArrayObject *array = m_args.as<QV4::ArrayObject>();
const QV4::FunctionObject *callback = m_function.as<QV4::FunctionObject>();
Q_ASSERT(callback);
const int argCount = array ? array->getLength() : 0;
QV4::JSCallArguments jsCallData(scope, argCount);
*jsCallData.thisObject = QV4::Encode::undefined();
for (int i = 0; i < argCount; i++) {
jsCallData.args[i] = array->get(i);
}
callback->call(jsCallData);
if (scope.hasException()) {
QQmlError error = scope.engine->catchExceptionAsQmlError();
error.setDescription(error.description() + QLatin1String(" (exception occurred during delayed function evaluation)"));
QQmlEnginePrivate::warning(QQmlEnginePrivate::get(scope.engine->qmlEngine()), error);
}
}
}
//
// class QQmlDelayedCallQueue
//
QQmlDelayedCallQueue::QQmlDelayedCallQueue()
: QObject(nullptr), m_engine(nullptr), m_callbackOutstanding(false)
{
}
QQmlDelayedCallQueue::~QQmlDelayedCallQueue()
{
}
void QQmlDelayedCallQueue::init(QV4::ExecutionEngine* engine)
{
m_engine = engine;
const QMetaObject &metaObject = QQmlDelayedCallQueue::staticMetaObject;
int methodIndex = metaObject.indexOfSlot("ticked()");
m_tickedMethod = metaObject.method(methodIndex);
}
QV4::ReturnedValue QQmlDelayedCallQueue::addUniquelyAndExecuteLater(QV4::ExecutionEngine *engine, QQmlV4FunctionPtr args)
{
QQmlDelayedCallQueue *self = engine->delayedCallQueue();
QV4::Scope scope(engine);
if (args->length() == 0)
THROW_GENERIC_ERROR("Qt.callLater: no arguments given");
QV4::ScopedValue firstArgument(scope, (*args)[0]);
const QV4::FunctionObject *func = firstArgument->as<QV4::FunctionObject>();
if (!func)
THROW_GENERIC_ERROR("Qt.callLater: first argument not a function or signal");
QPair<QObject *, int> functionData = QV4::QObjectMethod::extractQtMethod(func);
QVector<DelayedFunctionCall>::Iterator iter;
if (functionData.second != -1) {
// This is a QObject function wrapper
iter = self->m_delayedFunctionCalls.begin();
while (iter != self->m_delayedFunctionCalls.end()) {
DelayedFunctionCall& dfc = *iter;
QPair<QObject *, int> storedFunctionData = QV4::QObjectMethod::extractQtMethod(dfc.m_function.as<QV4::FunctionObject>());
if (storedFunctionData == functionData) {
break; // Already stored!
}
++iter;
}
} else {
// This is a JavaScript function (dynamic slot on VMEMO)
iter = self->m_delayedFunctionCalls.begin();
while (iter != self->m_delayedFunctionCalls.end()) {
DelayedFunctionCall& dfc = *iter;
if (firstArgument->asReturnedValue() == dfc.m_function.value()) {
break; // Already stored!
}
++iter;
}
}
const bool functionAlreadyStored = (iter != self->m_delayedFunctionCalls.end());
if (functionAlreadyStored) {
DelayedFunctionCall dfc = *iter;
self->m_delayedFunctionCalls.erase(iter);
self->m_delayedFunctionCalls.append(dfc);
} else {
self->m_delayedFunctionCalls.append(QV4::PersistentValue(engine, firstArgument));
}
DelayedFunctionCall& dfc = self->m_delayedFunctionCalls.last();
if (dfc.m_objectGuard.isNull()) {
if (functionData.second != -1) {
// if it's a qobject function wrapper, guard against qobject deletion
dfc.m_objectGuard = QQmlGuard<QObject>(functionData.first);
dfc.m_guarded = true;
} else if (func->scope()->type == QV4::Heap::ExecutionContext::Type_QmlContext) {
QV4::QmlContext::Data *g = static_cast<QV4::QmlContext::Data *>(func->scope());
Q_ASSERT(g->qml()->scopeObject);
dfc.m_objectGuard = QQmlGuard<QObject>(g->qml()->scopeObject);
dfc.m_guarded = true;
}
}
self->storeAnyArguments(dfc, args, 1, engine);
if (!self->m_callbackOutstanding) {
self->m_tickedMethod.invoke(self, Qt::QueuedConnection);
self->m_callbackOutstanding = true;
}
return QV4::Encode::undefined();
}
void QQmlDelayedCallQueue::storeAnyArguments(DelayedFunctionCall &dfc, QQmlV4FunctionPtr args, int offset, QV4::ExecutionEngine *engine)
{
const int length = args->length() - offset;
if (length == 0) {
dfc.m_args.clear();
return;
}
QV4::Scope scope(engine);
QV4::ScopedArrayObject array(scope, engine->newArrayObject(length));
uint i = 0;
for (int j = offset, ej = args->length(); j < ej; ++i, ++j)
array->put(i, (*args)[j]);
dfc.m_args.set(engine, array);
}
void QQmlDelayedCallQueue::executeAllExpired_Later()
{
// Make a local copy of the list and clear m_delayedFunctionCalls
// This ensures correct behavior in the case of recursive calls to Qt.callLater()
QVector<DelayedFunctionCall> delayedCalls = m_delayedFunctionCalls;
m_delayedFunctionCalls.clear();
QVector<DelayedFunctionCall>::Iterator iter = delayedCalls.begin();
while (iter != delayedCalls.end()) {
DelayedFunctionCall& dfc = *iter;
dfc.execute(m_engine);
++iter;
}
}
void QQmlDelayedCallQueue::ticked()
{
m_callbackOutstanding = false;
executeAllExpired_Later();
}
QT_END_NAMESPACE
#include "moc_qqmldelayedcallqueue_p.cpp"
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