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Diffstat (limited to 'examples/script/customclass/bytearrayclass.cpp')
-rw-r--r-- | examples/script/customclass/bytearrayclass.cpp | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/examples/script/customclass/bytearrayclass.cpp b/examples/script/customclass/bytearrayclass.cpp new file mode 100644 index 0000000..f325398 --- /dev/null +++ b/examples/script/customclass/bytearrayclass.cpp @@ -0,0 +1,308 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor +** the names of its contributors may be used to endorse or promote +** products derived from this software without specific prior written +** permission. +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QtScript/QScriptClassPropertyIterator> +#include <QtScript/QScriptEngine> +#include "bytearrayclass.h" +#include "bytearrayprototype.h" + +#include <stdlib.h> + +Q_DECLARE_METATYPE(QByteArray*) +Q_DECLARE_METATYPE(ByteArrayClass*) + +class ByteArrayClassPropertyIterator : public QScriptClassPropertyIterator +{ +public: + ByteArrayClassPropertyIterator(const QScriptValue &object); + ~ByteArrayClassPropertyIterator(); + + bool hasNext() const; + void next(); + + bool hasPrevious() const; + void previous(); + + void toFront(); + void toBack(); + + QScriptString name() const; + uint id() const; + +private: + int m_index; + int m_last; +}; + +//! [0] +ByteArrayClass::ByteArrayClass(QScriptEngine *engine) + : QObject(engine), QScriptClass(engine) +{ + qScriptRegisterMetaType<QByteArray>(engine, toScriptValue, fromScriptValue); + + length = engine->toStringHandle(QLatin1String("length")); + + proto = engine->newQObject(new ByteArrayPrototype(this), + QScriptEngine::QtOwnership, + QScriptEngine::SkipMethodsInEnumeration + | QScriptEngine::ExcludeSuperClassMethods + | QScriptEngine::ExcludeSuperClassProperties); + QScriptValue global = engine->globalObject(); + proto.setPrototype(global.property("Object").property("prototype")); + + ctor = engine->newFunction(construct, proto); + ctor.setData(engine->toScriptValue(this)); +} +//! [0] + +ByteArrayClass::~ByteArrayClass() +{ +} + +//! [3] +QScriptClass::QueryFlags ByteArrayClass::queryProperty(const QScriptValue &object, + const QScriptString &name, + QueryFlags flags, uint *id) +{ + QByteArray *ba = qscriptvalue_cast<QByteArray*>(object.data()); + if (!ba) + return 0; + if (name == length) { + return flags; + } else { + bool isArrayIndex; + qint32 pos = name.toArrayIndex(&isArrayIndex); + if (!isArrayIndex) + return 0; + *id = pos; + if ((flags & HandlesReadAccess) && (pos >= ba->size())) + flags &= ~HandlesReadAccess; + return flags; + } +} +//! [3] + +//! [4] +QScriptValue ByteArrayClass::property(const QScriptValue &object, + const QScriptString &name, uint id) +{ + QByteArray *ba = qscriptvalue_cast<QByteArray*>(object.data()); + if (!ba) + return QScriptValue(); + if (name == length) { + return ba->length(); + } else { + qint32 pos = id; + if ((pos < 0) || (pos >= ba->size())) + return QScriptValue(); + return uint(ba->at(pos)) & 255; + } + return QScriptValue(); +} +//! [4] + +//! [5] +void ByteArrayClass::setProperty(QScriptValue &object, + const QScriptString &name, + uint id, const QScriptValue &value) +{ + QByteArray *ba = qscriptvalue_cast<QByteArray*>(object.data()); + if (!ba) + return; + if (name == length) { + resize(*ba, value.toInt32()); + } else { + qint32 pos = id; + if (pos < 0) + return; + if (ba->size() <= pos) + resize(*ba, pos + 1); + (*ba)[pos] = char(value.toInt32()); + } +} +//! [5] + +//! [6] +QScriptValue::PropertyFlags ByteArrayClass::propertyFlags( + const QScriptValue &/*object*/, const QScriptString &name, uint /*id*/) +{ + if (name == length) { + return QScriptValue::Undeletable + | QScriptValue::SkipInEnumeration; + } + return QScriptValue::Undeletable; +} +//! [6] + +//! [7] +QScriptClassPropertyIterator *ByteArrayClass::newIterator(const QScriptValue &object) +{ + return new ByteArrayClassPropertyIterator(object); +} +//! [7] + +QString ByteArrayClass::name() const +{ + return QLatin1String("ByteArray"); +} + +QScriptValue ByteArrayClass::prototype() const +{ + return proto; +} + +QScriptValue ByteArrayClass::constructor() +{ + return ctor; +} + +//! [10] +QScriptValue ByteArrayClass::newInstance(int size) +{ + engine()->reportAdditionalMemoryCost(size); + return newInstance(QByteArray(size, /*ch=*/0)); +} +//! [10] + +//! [1] +QScriptValue ByteArrayClass::newInstance(const QByteArray &ba) +{ + QScriptValue data = engine()->newVariant(QVariant::fromValue(ba)); + return engine()->newObject(this, data); +} +//! [1] + +//! [2] +QScriptValue ByteArrayClass::construct(QScriptContext *ctx, QScriptEngine *) +{ + ByteArrayClass *cls = qscriptvalue_cast<ByteArrayClass*>(ctx->callee().data()); + if (!cls) + return QScriptValue(); + QScriptValue arg = ctx->argument(0); + if (arg.instanceOf(ctx->callee())) + return cls->newInstance(qscriptvalue_cast<QByteArray>(arg)); + int size = arg.toInt32(); + return cls->newInstance(size); +} +//! [2] + +QScriptValue ByteArrayClass::toScriptValue(QScriptEngine *eng, const QByteArray &ba) +{ + QScriptValue ctor = eng->globalObject().property("ByteArray"); + ByteArrayClass *cls = qscriptvalue_cast<ByteArrayClass*>(ctor.data()); + if (!cls) + return eng->newVariant(QVariant::fromValue(ba)); + return cls->newInstance(ba); +} + +void ByteArrayClass::fromScriptValue(const QScriptValue &obj, QByteArray &ba) +{ + ba = qvariant_cast<QByteArray>(obj.data().toVariant()); +} + +//! [9] +void ByteArrayClass::resize(QByteArray &ba, int newSize) +{ + int oldSize = ba.size(); + ba.resize(newSize); + if (newSize > oldSize) + engine()->reportAdditionalMemoryCost(newSize - oldSize); +} +//! [9] + + + +ByteArrayClassPropertyIterator::ByteArrayClassPropertyIterator(const QScriptValue &object) + : QScriptClassPropertyIterator(object) +{ + toFront(); +} + +ByteArrayClassPropertyIterator::~ByteArrayClassPropertyIterator() +{ +} + +//! [8] +bool ByteArrayClassPropertyIterator::hasNext() const +{ + QByteArray *ba = qscriptvalue_cast<QByteArray*>(object().data()); + return m_index < ba->size(); +} + +void ByteArrayClassPropertyIterator::next() +{ + m_last = m_index; + ++m_index; +} + +bool ByteArrayClassPropertyIterator::hasPrevious() const +{ + return (m_index > 0); +} + +void ByteArrayClassPropertyIterator::previous() +{ + --m_index; + m_last = m_index; +} + +void ByteArrayClassPropertyIterator::toFront() +{ + m_index = 0; + m_last = -1; +} + +void ByteArrayClassPropertyIterator::toBack() +{ + QByteArray *ba = qscriptvalue_cast<QByteArray*>(object().data()); + m_index = ba->size(); + m_last = -1; +} + +QScriptString ByteArrayClassPropertyIterator::name() const +{ + return object().engine()->toStringHandle(QString::number(m_last)); +} + +uint ByteArrayClassPropertyIterator::id() const +{ + return m_last; +} +//! [8] |