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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQuick 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 QQUICKSTATE_H
#define QQUICKSTATE_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <qqml.h>
#include <qqmlproperty.h>
#include <QtCore/qobject.h>
#include <QtCore/qsharedpointer.h>
#include <private/qtquickglobal_p.h>
#include <private/qqmlabstractbinding_p.h>
QT_BEGIN_NAMESPACE
class QQuickStateActionEvent;
class QQmlBinding;
class QQmlExpression;
class QQuickStateAction
{
public:
QQuickStateAction();
QQuickStateAction(QObject *, const QString &, const QVariant &);
QQuickStateAction(QObject *, const QString &,
QQmlContext *, const QVariant &);
bool restore:1;
bool actionDone:1;
bool reverseEvent:1;
bool deletableToBinding:1;
QQmlProperty property;
QVariant fromValue;
QVariant toValue;
QQmlAbstractBinding::Ptr fromBinding;
QQmlAbstractBinding::Ptr toBinding;
QQuickStateActionEvent *event;
//strictly for matching
QObject *specifiedObject;
QString specifiedProperty;
void deleteFromBinding();
};
class Q_AUTOTEST_EXPORT QQuickStateActionEvent
{
public:
virtual ~QQuickStateActionEvent();
enum EventType { Script, SignalHandler, ParentChange, AnchorChanges };
virtual EventType type() const = 0;
virtual void execute();
virtual bool isReversable();
virtual void reverse();
virtual void saveOriginals() {}
virtual bool needsCopy() { return false; }
virtual void copyOriginals(QQuickStateActionEvent *) {}
virtual bool isRewindable() { return isReversable(); }
virtual void rewind() {}
virtual void saveCurrentValues() {}
virtual void saveTargetValues() {}
virtual bool changesBindings();
virtual void clearBindings();
virtual bool override(QQuickStateActionEvent*other);
};
//### rename to QQuickStateChange?
class QQuickStateGroup;
class QQuickState;
class QQuickStateOperationPrivate;
class Q_QUICK_PRIVATE_EXPORT QQuickStateOperation : public QObject
{
Q_OBJECT
public:
QQuickStateOperation(QObject *parent = 0)
: QObject(parent) {}
typedef QList<QQuickStateAction> ActionList;
virtual ActionList actions();
QQuickState *state() const;
void setState(QQuickState *state);
protected:
QQuickStateOperation(QObjectPrivate &dd, QObject *parent = 0);
private:
Q_DECLARE_PRIVATE(QQuickStateOperation)
Q_DISABLE_COPY(QQuickStateOperation)
};
typedef QQuickStateOperation::ActionList QQuickStateActions;
class QQuickTransition;
class QQuickStatePrivate;
class Q_QUICK_PRIVATE_EXPORT QQuickState : public QObject
{
Q_OBJECT
Q_PROPERTY(QString name READ name WRITE setName)
Q_PROPERTY(QQmlBinding *when READ when WRITE setWhen)
Q_PROPERTY(QString extend READ extends WRITE setExtends)
Q_PROPERTY(QQmlListProperty<QQuickStateOperation> changes READ changes)
Q_CLASSINFO("DefaultProperty", "changes")
Q_CLASSINFO("DeferredPropertyNames", "changes")
public:
QQuickState(QObject *parent=0);
virtual ~QQuickState();
QString name() const;
void setName(const QString &);
bool isNamed() const;
/*'when' is a QQmlBinding to limit state changes oscillation
due to the unpredictable order of evaluation of bound expressions*/
bool isWhenKnown() const;
QQmlBinding *when() const;
void setWhen(QQmlBinding *);
QString extends() const;
void setExtends(const QString &);
QQmlListProperty<QQuickStateOperation> changes();
int operationCount() const;
QQuickStateOperation *operationAt(int) const;
QQuickState &operator<<(QQuickStateOperation *);
void apply(QQuickTransition *, QQuickState *revert);
void cancel();
QQuickStateGroup *stateGroup() const;
void setStateGroup(QQuickStateGroup *);
bool containsPropertyInRevertList(QObject *target, const QString &name) const;
bool changeValueInRevertList(QObject *target, const QString &name, const QVariant &revertValue);
bool changeBindingInRevertList(QObject *target, const QString &name, QQmlAbstractBinding *binding);
bool removeEntryFromRevertList(QObject *target, const QString &name);
void addEntryToRevertList(const QQuickStateAction &action);
void removeAllEntriesFromRevertList(QObject *target);
void addEntriesToRevertList(const QList<QQuickStateAction> &actions);
QVariant valueInRevertList(QObject *target, const QString &name) const;
QQmlAbstractBinding *bindingInRevertList(QObject *target, const QString &name) const;
bool isStateActive() const;
Q_SIGNALS:
void completed();
private:
Q_DECLARE_PRIVATE(QQuickState)
Q_DISABLE_COPY(QQuickState)
};
QT_END_NAMESPACE
QML_DECLARE_TYPE(QQuickStateOperation)
QML_DECLARE_TYPE(QQuickState)
#endif // QQUICKSTATE_H
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