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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the $MODULE$ of the Qt Toolkit.
**
** $TROLLTECH_DUAL_LICENSE$
**
****************************************************************************/
#include "qtransition.h"
#include "qtransition_p.h"
#include "qstateaction.h"
#include "qstateaction_p.h"
QT_BEGIN_NAMESPACE
/*!
\class QTransition
\brief The QTransition class provides an action-based transition.
\ingroup statemachine
QTransition provides an action-based transition; you add actions with the
addAction() function. The transition executes the actions when the
transition is triggered. QTransition is part of \l{The State Machine
Framework}.
Built-in actions are provided for setting properties and invoking methods of
QObjects. The setPropertyOnTransition() function is used for defining
property assignments that should be performed when a transition is taken.
The invokeMethodOnTransition() function is used for defining method
invocations that should be performed when a transition is taken.
\code
QStateMachine machine;
QState *s1 = new QState();
machine.addState(s1);
QTransition *t1 = new QTransition();
QLabel label;
t1->setPropertyOnTransition(&label, "text", "Transition t1 was triggered");
QState *s2 = new QState();
machine.addState(s2);
t1->setTargetState(s2);
s1->addTransition(t1);
\endcode
Actions are executed in the order in which they were added.
\sa QState::addTransition(), QStateAction
*/
QTransitionPrivate::QTransitionPrivate()
{
}
QTransitionPrivate::~QTransitionPrivate()
{
}
QTransitionPrivate *QTransitionPrivate::get(QTransition *q)
{
return q->d_func();
}
const QTransitionPrivate *QTransitionPrivate::get(const QTransition *q)
{
return q->d_func();
}
QList<QStateAction*> QTransitionPrivate::actions() const
{
QList<QStateAction*> result;
QList<QObject*>::const_iterator it;
#ifdef QT_STATEMACHINE_SOLUTION
const QObjectList &children = q_func()->children();
#endif
for (it = children.constBegin(); it != children.constEnd(); ++it) {
QStateAction *s = qobject_cast<QStateAction*>(*it);
if (s)
result.append(s);
}
return result;
}
/*!
Constructs a new QTransition object with the given \a sourceState.
*/
QTransition::QTransition(QState *sourceState)
: QAbstractTransition(*new QTransitionPrivate, sourceState)
{
}
/*!
Constructs a new QTransition object with the given \a targets and \a
sourceState.
*/
QTransition::QTransition(const QList<QAbstractState*> &targets, QState *sourceState)
: QAbstractTransition(*new QTransitionPrivate, targets, sourceState)
{
}
/*!
\internal
*/
QTransition::QTransition(QTransitionPrivate &dd, QState *parent)
: QAbstractTransition(dd, parent)
{
}
/*!
\internal
*/
QTransition::QTransition(QTransitionPrivate &dd, const QList<QAbstractState*> &targets, QState *parent)
: QAbstractTransition(dd, targets, parent)
{
}
/*!
Destroys this transition.
*/
QTransition::~QTransition()
{
}
/*!
Instructs this QTransition to set the property with the given \a name of the
given \a object to the given \a value when the transition is taken. This
function will create a QStateSetPropertyAction object and add it to the
actions of the transition. If there is already an existing action associated
with the property, the value of that action is updated.
\sa invokeMethodOnTransition()
*/
void QTransition::setPropertyOnTransition(QObject *object, const char *name,
const QVariant &value)
{
Q_D(QTransition);
QList<QStateAction*> actions = d->actions();
for (int i = 0; i < actions.size(); ++i) {
QStateAction *action = actions.at(i);
if (QStateSetPropertyAction *spa = qobject_cast<QStateSetPropertyAction*>(action)) {
if (spa->targetObject() == object && spa->propertyName() == name) {
QStateSetPropertyActionPrivate::get(spa)->value = value;
return;
}
}
}
addAction(new QStateSetPropertyAction(object, name, value));
}
/*!
Instructs this QTransition to invoke the given \a method of the given \a
object with the given \a arguments when the transition is taken. This
function will create a QStateInvokeMethodAction object and add it to the
actions of the transition.
\sa setPropertyOnTransition()
*/
void QTransition::invokeMethodOnTransition(QObject *object, const char *method,
const QList<QVariant> &arguments)
{
addAction(new QStateInvokeMethodAction(object, method, arguments));
}
/*!
Adds the given \a action to this transition.
The action will be executed when the transition is triggered.
The transition takes ownership of the action.
\sa removeAction()
*/
void QTransition::addAction(QStateAction *action)
{
if (!action) {
qWarning("QTransition::addAction: cannot add null action");
return;
}
action->setParent(this);
}
/*!
Removes the given \a action from this transition.
The transition releases ownership of the action.
\sa addAction()
*/
void QTransition::removeAction(QStateAction *action)
{
if (!action) {
qWarning("QTransition::removeAction: cannot remove null action");
return;
}
action->setParent(0);
}
/*!
Returns this transitions's actions, or an empty list if the transition has
no actions.
\sa addAction()
*/
QList<QStateAction*> QTransition::actions() const
{
Q_D(const QTransition);
return d->actions();
}
/*!
\reimp
*/
void QTransition::onTransition()
{
Q_D(QTransition);
QList<QStateAction*> actions = d->actions();
for (int i = 0; i < actions.size(); ++i)
QStateActionPrivate::get(actions.at(i))->callExecute();
}
/*!
\reimp
*/
bool QTransition::event(QEvent *e)
{
return QAbstractTransition::event(e);
}
QT_END_NAMESPACE
|
