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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QQMLCOMPONENT_H
#define QQMLCOMPONENT_H
#include <QtQml/qqml.h>
#include <QtQml/qqmlerror.h>
#include <QtCore/qobject.h>
#include <QtCore/qstring.h>
#include <QtQml/qjsvalue.h>
QT_BEGIN_NAMESPACE
class QByteArray;
class QQmlEngine;
class QQmlComponent;
class QQmlIncubator;
class QQmlV4Function;
class QQmlComponentPrivate;
class QQmlComponentAttached;
namespace QV4 {
class ExecutableCompilationUnit;
}
class Q_QML_EXPORT QQmlComponent : public QObject
{
Q_OBJECT
Q_DECLARE_PRIVATE(QQmlComponent)
Q_PROPERTY(qreal progress READ progress NOTIFY progressChanged)
Q_PROPERTY(Status status READ status NOTIFY statusChanged)
Q_PROPERTY(QUrl url READ url CONSTANT)
QML_NAMED_ELEMENT(Component)
QML_ADDED_IN_VERSION(2, 0)
QML_ATTACHED(QQmlComponentAttached)
public:
enum CompilationMode { PreferSynchronous, Asynchronous };
Q_ENUM(CompilationMode)
QQmlComponent(QObject *parent = nullptr);
QQmlComponent(QQmlEngine *, QObject *parent = nullptr);
QQmlComponent(QQmlEngine *, const QString &fileName, QObject *parent = nullptr);
QQmlComponent(QQmlEngine *, const QString &fileName, CompilationMode mode, QObject *parent = nullptr);
QQmlComponent(QQmlEngine *, const QUrl &url, QObject *parent = nullptr);
QQmlComponent(QQmlEngine *, const QUrl &url, CompilationMode mode, QObject *parent = nullptr);
~QQmlComponent() override;
enum Status { Null, Ready, Loading, Error };
Q_ENUM(Status)
Status status() const;
bool isNull() const;
bool isReady() const;
bool isError() const;
bool isLoading() const;
QList<QQmlError> errors() const;
Q_INVOKABLE QString errorString() const;
qreal progress() const;
QUrl url() const;
virtual QObject *create(QQmlContext *context = nullptr);
QObject *createWithInitialProperties(const QVariantMap& initialProperties, QQmlContext *context = nullptr);
void setInitialProperties(QObject *component, const QVariantMap &properties);
virtual QObject *beginCreate(QQmlContext *);
virtual void completeCreate();
void create(QQmlIncubator &, QQmlContext *context = nullptr,
QQmlContext *forContext = nullptr);
QQmlContext *creationContext() const;
QQmlEngine *engine() const;
static QQmlComponentAttached *qmlAttachedProperties(QObject *);
public Q_SLOTS:
void loadUrl(const QUrl &url);
void loadUrl(const QUrl &url, CompilationMode mode);
void setData(const QByteArray &, const QUrl &baseUrl);
Q_SIGNALS:
void statusChanged(QQmlComponent::Status);
void progressChanged(qreal);
protected:
QQmlComponent(QQmlComponentPrivate &dd, QObject* parent);
Q_INVOKABLE void createObject(QQmlV4Function *);
Q_INVOKABLE void incubateObject(QQmlV4Function *);
private:
QQmlComponent(QQmlEngine *, QV4::ExecutableCompilationUnit *compilationUnit, int,
QObject *parent);
Q_DISABLE_COPY(QQmlComponent)
friend class QQmlTypeData;
friend class QQmlObjectCreator;
};
// Don't do this at home.
namespace QQmlPrivate {
// Generally you cannot use QQmlComponentAttached as attached properties object in derived classes.
// It is private.
template<class T>
struct OverridableAttachedType<T, QQmlComponentAttached>
{
using Type = void;
};
// QQmlComponent itself is allowed to use QQmlComponentAttached, though.
template<>
struct OverridableAttachedType<QQmlComponent, QQmlComponentAttached>
{
using Type = QQmlComponentAttached;
};
} // namespace QQmlPrivate
QT_END_NAMESPACE
QML_DECLARE_TYPE(QQmlComponent)
#endif // QQMLCOMPONENT_H
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