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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 QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qstatemachine.h"
#include "qstate.h"
#include "qstate_p.h"
#include "qstatemachine_p.h"
#include "qabstracttransition.h"
#include "qabstracttransition_p.h"
#include "qsignaltransition.h"
#include "qsignaltransition_p.h"
#include "qsignalevent.h"
#include "qsignaleventgenerator_p.h"
#include "qabstractstate.h"
#include "qabstractstate_p.h"
#include "qfinalstate.h"
#include "qhistorystate.h"
#include "qhistorystate_p.h"
#ifndef QT_STATEMACHINE_SOLUTION
#include "private/qobject_p.h"
#include "private/qthread_p.h"
#endif
#ifndef QT_NO_STATEMACHINE_EVENTFILTER
#include "qeventtransition.h"
#include "qeventtransition_p.h"
#include "qwrappedevent.h"
#endif
#ifndef QT_NO_ANIMATION
#include "qpropertyanimation.h"
#include "qanimationgroup.h"
# ifndef QT_STATEMACHINE_SOLUTION
# include <private/qvariantanimation_p.h>
# else
# include "qvariantanimation_p.h"
# endif
#endif
#include <QtCore/qmetaobject.h>
#include <qdebug.h>
QT_BEGIN_NAMESPACE
/*!
\class QStateMachine
\reentrant
\brief The QStateMachine class provides a hierarchical finite state machine.
\since 4.6
\ingroup statemachine
The QStateMachine class provides a hierarchical finite state machine based
on \l{Statecharts: A visual formalism for complex systems}{Statecharts}
concepts and notation. QStateMachine is part of \l{The State Machine
Framework}.
A state machine manages a set of states (QAbstractState objects) and
transitions (QAbstractTransition objects) between those states; the states
and the transitions collectively define a state graph. Once a state graph
has been defined, the state machine can execute it. QStateMachine's
execution algorithm is based on the \l{State Chart XML: State Machine
Notation for Control Abstraction}{State Chart XML (SCXML)} algorithm.
The QState class provides a state that you can use to set properties and
invoke methods on QObjects when the state is entered or exited. This is
typically used in conjunction with \l{Signals and Slots}{signals}; the
signals determine the flow of the state graph, whereas the states' property
assignments and method invocations are the actions.
Use the addState() function to add a state to the state machine;
alternatively, pass the machine's rootState() to the state constructor. Use
the removeState() function to remove a state from the state machine.
The following snippet shows a state machine that will finish when a button
is clicked:
\code
QPushButton button;
QStateMachine machine;
QState *s1 = new QState();
s1->assignProperty(&button, "text", "Click me");
QFinalState *s2 = new QFinalState();
s1->addTransition(&button, SIGNAL(clicked()), s2);
machine.addState(s1);
machine.addState(s2);
machine.setInitialState(s1);
machine.start();
\endcode
The setInitialState() function sets the state machine's initial state; this
state is entered when the state machine is started.
The start() function starts the state machine. The state machine executes
asynchronously, i.e. you need to run an event loop in order for it to make
progress. The started() signal is emitted when the state machine has entered
the initial state.
The state machine processes events and takes transitions until a top-level
final state is entered; the state machine then emits the finished() signal.
The stop() function stops the state machine. The stopped() signal is emitted
when the state machine has stopped.
The postEvent() function posts an event to the state machine. This is useful
when you are using custom events to trigger transitions.
The rootState() function returns the state machine's root state. All
top-level states have the root state as their parent.
\sa QAbstractState, QAbstractTransition
*/
/*!
\property QStateMachine::rootState
\brief the root state of this state machine
*/
/*!
\property QStateMachine::initialState
\brief the initial state of this state machine
The initial state must be one of the rootState()'s child states.
*/
/*!
\property QStateMachine::errorState
\brief the error state of this state machine
*/
/*!
\property QStateMachine::errorString
\brief the error string of this state machine
*/
/*!
\property QStateMachine::globalRestorePolicy
\brief the restore policy for states of this state machine.
The default value of this property is
QStateMachine::DoNotRestoreProperties.
*/
#ifndef QT_NO_ANIMATION
/*!
\property QStateMachine::animationsEnabled
\brief whether animations are enabled
The default value of this property is true.
\sa QAbstractTransition::addAnimation()
*/
#endif
// #define QSTATEMACHINE_DEBUG
QStateMachinePrivate::QStateMachinePrivate()
{
state = NotRunning;
processing = false;
processingScheduled = false;
stop = false;
error = QStateMachine::NoError;
globalRestorePolicy = QStateMachine::DoNotRestoreProperties;
rootState = 0;
initialErrorStateForRoot = 0;
#ifndef QT_STATEMACHINE_SOLUTION
signalEventGenerator = 0;
#endif
#ifndef QT_NO_ANIMATION
animationsEnabled = true;
#endif
}
QStateMachinePrivate::~QStateMachinePrivate()
{
qDeleteAll(internalEventQueue);
qDeleteAll(externalEventQueue);
}
QStateMachinePrivate *QStateMachinePrivate::get(QStateMachine *q)
{
if (q)
return q->d_func();
return 0;
}
static QEvent *cloneEvent(QEvent *e)
{
switch (e->type()) {
case QEvent::None:
return new QEvent(*e);
case QEvent::Timer:
return new QTimerEvent(*static_cast<QTimerEvent*>(e));
default:
Q_ASSERT_X(false, "cloneEvent()", "not implemented");
break;
}
return 0;
}
const QStateMachinePrivate::Handler qt_kernel_statemachine_handler = {
cloneEvent
};
const QStateMachinePrivate::Handler *QStateMachinePrivate::handler = &qt_kernel_statemachine_handler;
Q_CORE_EXPORT const QStateMachinePrivate::Handler *qcoreStateMachineHandler()
{
return &qt_kernel_statemachine_handler;
}
static int indexOfDescendant(QState *s, QAbstractState *desc)
{
QList<QAbstractState*> childStates = QStatePrivate::get(s)->childStates();
for (int i = 0; i < childStates.size(); ++i) {
QAbstractState *c = childStates.at(i);
if ((c == desc) || QStateMachinePrivate::isDescendantOf(desc, c)) {
return i;
}
}
return -1;
}
bool QStateMachinePrivate::stateEntryLessThan(QAbstractState *s1, QAbstractState *s2)
{
if (s1->parent() == s2->parent()) {
return s1->children().indexOf(s1)
< s2->children().indexOf(s2);
} else if (isDescendantOf(s1, s2)) {
return false;
} else if (isDescendantOf(s2, s1)) {
return true;
} else {
QState *lca = findLCA(QList<QAbstractState*>() << s1 << s2);
Q_ASSERT(lca != 0);
return (indexOfDescendant(lca, s1) < indexOfDescendant(lca, s2));
}
}
bool QStateMachinePrivate::stateExitLessThan(QAbstractState *s1, QAbstractState *s2)
{
if (s1->parent() == s2->parent()) {
return s1->children().indexOf(s1)
< s2->children().indexOf(s2);
} else if (isDescendantOf(s1, s2)) {
return true;
} else if (isDescendantOf(s2, s1)) {
return false;
} else {
QState *lca = findLCA(QList<QAbstractState*>() << s1 << s2);
Q_ASSERT(lca != 0);
return (indexOfDescendant(lca, s1) < indexOfDescendant(lca, s2));
}
}
QState *QStateMachinePrivate::findLCA(const QList<QAbstractState*> &states)
{
if (states.isEmpty())
return 0;
QList<QState*> ancestors = properAncestors(states.at(0), 0);
for (int i = 0; i < ancestors.size(); ++i) {
QState *anc = ancestors.at(i);
bool ok = true;
for (int j = states.size() - 1; (j > 0) && ok; --j) {
const QAbstractState *s = states.at(j);
if (!isDescendantOf(s, anc))
ok = false;
}
if (ok)
return anc;
}
return 0;
}
bool QStateMachinePrivate::isPreempted(const QAbstractState *s, const QSet<QAbstractTransition*> &transitions) const
{
QSet<QAbstractTransition*>::const_iterator it;
for (it = transitions.constBegin(); it != transitions.constEnd(); ++it) {
QAbstractTransition *t = *it;
QList<QAbstractState*> lst = t->targetStates();
if (!lst.isEmpty()) {
lst.prepend(t->sourceState());
QAbstractState *lca = findLCA(lst);
if (isDescendantOf(s, lca)) {
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q_func() << ":" << transitions << "preempts selection of a transition from"
<< s << "because" << s << "is a descendant of" << lca;
#endif
return true;
}
}
}
return false;
}
QSet<QAbstractTransition*> QStateMachinePrivate::selectTransitions(QEvent *event) const
{
Q_Q(const QStateMachine);
QSet<QAbstractTransition*> enabledTransitions;
QSet<QAbstractState*>::const_iterator it;
const_cast<QStateMachine*>(q)->beginSelectTransitions(event);
for (it = configuration.constBegin(); it != configuration.constEnd(); ++it) {
QAbstractState *state = *it;
if (!isAtomic(state))
continue;
if (isPreempted(state, enabledTransitions))
continue;
QList<QState*> lst = properAncestors(state, 0);
if (QState *grp = qobject_cast<QState*>(state))
lst.prepend(grp);
bool found = false;
for (int j = 0; (j < lst.size()) && !found; ++j) {
QState *s = lst.at(j);
QList<QAbstractTransition*> transitions = QStatePrivate::get(s)->transitions();
for (int k = 0; k < transitions.size(); ++k) {
QAbstractTransition *t = transitions.at(k);
if (QAbstractTransitionPrivate::get(t)->callEventTest(event)) {
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q << ": selecting transition" << t;
#endif
enabledTransitions.insert(t);
found = true;
break;
}
}
}
}
const_cast<QStateMachine*>(q)->endSelectTransitions(event);
return enabledTransitions;
}
void QStateMachinePrivate::microstep(QEvent *event, const QList<QAbstractTransition*> &enabledTransitions)
{
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q_func() << ": begin microstep( enabledTransitions:" << enabledTransitions << ")";
qDebug() << q_func() << ": configuration before exiting states:" << configuration;
#endif
QList<QAbstractState*> exitedStates = exitStates(event, enabledTransitions);
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q_func() << ": configuration after exiting states:" << configuration;
#endif
executeTransitionContent(event, enabledTransitions);
QList<QAbstractState*> enteredStates = enterStates(event, enabledTransitions);
applyProperties(enabledTransitions, exitedStates, enteredStates);
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q_func() << ": configuration after entering states:" << configuration;
qDebug() << q_func() << ": end microstep";
#endif
}
QList<QAbstractState*> QStateMachinePrivate::exitStates(QEvent *event, const QList<QAbstractTransition*> &enabledTransitions)
{
// qDebug() << "exitStates(" << enabledTransitions << ")";
QSet<QAbstractState*> statesToExit;
// QSet<QAbstractState*> statesToSnapshot;
for (int i = 0; i < enabledTransitions.size(); ++i) {
QAbstractTransition *t = enabledTransitions.at(i);
QList<QAbstractState*> lst = t->targetStates();
if (lst.isEmpty())
continue;
lst.prepend(t->sourceState());
QAbstractState *lca = findLCA(lst);
{
QSet<QAbstractState*>::const_iterator it;
for (it = configuration.constBegin(); it != configuration.constEnd(); ++it) {
QAbstractState *s = *it;
if (isDescendantOf(s, lca))
statesToExit.insert(s);
}
}
}
QList<QAbstractState*> statesToExit_sorted = statesToExit.toList();
qSort(statesToExit_sorted.begin(), statesToExit_sorted.end(), stateExitLessThan);
for (int i = 0; i < statesToExit_sorted.size(); ++i) {
QAbstractState *s = statesToExit_sorted.at(i);
if (QState *grp = qobject_cast<QState*>(s)) {
QList<QHistoryState*> hlst = QStatePrivate::get(grp)->historyStates();
for (int j = 0; j < hlst.size(); ++j) {
QHistoryState *h = hlst.at(j);
QHistoryStatePrivate::get(h)->configuration.clear();
QSet<QAbstractState*>::const_iterator it;
for (it = configuration.constBegin(); it != configuration.constEnd(); ++it) {
QAbstractState *s0 = *it;
if (QHistoryStatePrivate::get(h)->historyType == QHistoryState::DeepHistory) {
if (isAtomic(s0) && isDescendantOf(s0, s))
QHistoryStatePrivate::get(h)->configuration.append(s0);
} else if (s0->parentState() == s) {
QHistoryStatePrivate::get(h)->configuration.append(s0);
}
}
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q_func() << ": recorded" << ((QHistoryStatePrivate::get(h)->historyType == QHistoryState::DeepHistory) ? "deep" : "shallow")
<< "history for" << s << "in" << h << ":" << QHistoryStatePrivate::get(h)->configuration;
#endif
}
}
}
for (int i = 0; i < statesToExit_sorted.size(); ++i) {
QAbstractState *s = statesToExit_sorted.at(i);
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q_func() << ": exiting" << s;
#endif
QAbstractStatePrivate::get(s)->callOnExit(event);
configuration.remove(s);
QAbstractStatePrivate::get(s)->emitExited();
}
return statesToExit_sorted;
}
void QStateMachinePrivate::executeTransitionContent(QEvent *event, const QList<QAbstractTransition*> &enabledTransitions)
{
for (int i = 0; i < enabledTransitions.size(); ++i) {
QAbstractTransition *t = enabledTransitions.at(i);
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q_func() << ": triggering" << t;
#endif
QAbstractTransitionPrivate::get(t)->callOnTransition(event);
}
}
QList<QAbstractState*> QStateMachinePrivate::enterStates(QEvent *event, const QList<QAbstractTransition*> &enabledTransitions)
{
#ifdef QSTATEMACHINE_DEBUG
Q_Q(QStateMachine);
#endif
// qDebug() << "enterStates(" << enabledTransitions << ")";
QSet<QAbstractState*> statesToEnter;
QSet<QAbstractState*> statesForDefaultEntry;
for (int i = 0; i < enabledTransitions.size(); ++i) {
QAbstractTransition *t = enabledTransitions.at(i);
QList<QAbstractState*> lst = t->targetStates();
if (lst.isEmpty())
continue;
lst.prepend(t->sourceState());
QState *lca = findLCA(lst);
for (int j = 1; j < lst.size(); ++j) {
QAbstractState *s = lst.at(j);
addStatesToEnter(s, lca, statesToEnter, statesForDefaultEntry);
if (isParallel(lca)) {
QList<QAbstractState*> lcac = QStatePrivate::get(lca)->childStates();
foreach (QAbstractState* child,lcac) {
if (!statesToEnter.contains(child))
addStatesToEnter(child,lca,statesToEnter,statesForDefaultEntry);
}
}
}
}
// Did an error occur while selecting transitions? Then we enter the error state.
if (!pendingErrorStates.isEmpty()) {
statesToEnter.clear();
statesToEnter = pendingErrorStates;
statesForDefaultEntry = pendingErrorStatesForDefaultEntry;
pendingErrorStates.clear();
pendingErrorStatesForDefaultEntry.clear();
}
QList<QAbstractState*> statesToEnter_sorted = statesToEnter.toList();
qSort(statesToEnter_sorted.begin(), statesToEnter_sorted.end(), stateEntryLessThan);
for (int i = 0; i < statesToEnter_sorted.size(); ++i) {
QAbstractState *s = statesToEnter_sorted.at(i);
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q << ": entering" << s;
#endif
configuration.insert(s);
registerTransitions(s);
QAbstractStatePrivate::get(s)->callOnEntry(event);
QAbstractStatePrivate::get(s)->emitEntered();
if (statesForDefaultEntry.contains(s)) {
// ### executeContent(s.initial.transition.children())
}
if (isFinal(s)) {
QState *parent = s->parentState();
if (parent) {
QState *grandparent = parent->parentState();
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q << ": emitting finished signal for" << parent;
#endif
QStatePrivate::get(parent)->emitFinished();
if (grandparent && isParallel(grandparent)) {
bool allChildStatesFinal = true;
QList<QAbstractState*> childStates = QStatePrivate::get(grandparent)->childStates();
for (int j = 0; j < childStates.size(); ++j) {
QAbstractState *cs = childStates.at(j);
if (!isInFinalState(cs)) {
allChildStatesFinal = false;
break;
}
}
if (allChildStatesFinal) {
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q << ": emitting finished signal for" << grandparent;
#endif
QStatePrivate::get(grandparent)->emitFinished();
}
}
}
}
}
{
QSet<QAbstractState*>::const_iterator it;
for (it = configuration.constBegin(); it != configuration.constEnd(); ++it) {
if (isFinal(*it) && (*it)->parentState() == rootState) {
processing = false;
stopProcessingReason = Finished;
break;
}
}
}
// qDebug() << "configuration:" << configuration.toList();
return statesToEnter_sorted;
}
void QStateMachinePrivate::addStatesToEnter(QAbstractState *s, QState *root,
QSet<QAbstractState*> &statesToEnter,
QSet<QAbstractState*> &statesForDefaultEntry)
{
if (QHistoryState *h = qobject_cast<QHistoryState*>(s)) {
QList<QAbstractState*> hconf = QHistoryStatePrivate::get(h)->configuration;
if (!hconf.isEmpty()) {
for (int k = 0; k < hconf.size(); ++k) {
QAbstractState *s0 = hconf.at(k);
addStatesToEnter(s0, root, statesToEnter, statesForDefaultEntry);
}
#ifdef QSTATEMACHINE_DEBUG
qDebug() <<q_func() << ": restoring"
<< ((QHistoryStatePrivate::get(h)->historyType == QHistoryState::DeepHistory) ? "deep" : "shallow")
<< "history from" << s << ":" << hconf;
#endif
} else {
QList<QAbstractState*> hlst;
if (QHistoryStatePrivate::get(h)->defaultState)
hlst.append(QHistoryStatePrivate::get(h)->defaultState);
if (hlst.isEmpty()) {
setError(QStateMachine::NoDefaultStateInHistoryState, h);
} else {
for (int k = 0; k < hlst.size(); ++k) {
QAbstractState *s0 = hlst.at(k);
addStatesToEnter(s0, root, statesToEnter, statesForDefaultEntry);
}
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q_func() << ": initial history targets for" << s << ":" << hlst;
#endif
}
}
} else {
statesToEnter.insert(s);
if (isParallel(s)) {
QState *grp = qobject_cast<QState*>(s);
QList<QAbstractState*> lst = QStatePrivate::get(grp)->childStates();
for (int i = 0; i < lst.size(); ++i) {
QAbstractState *child = lst.at(i);
addStatesToEnter(child, grp, statesToEnter, statesForDefaultEntry);
}
} else if (isCompound(s)) {
statesForDefaultEntry.insert(s);
QState *grp = qobject_cast<QState*>(s);
QAbstractState *initial = grp->initialState();
if (initial != 0) {
addStatesToEnter(initial, grp, statesToEnter, statesForDefaultEntry);
} else {
setError(QStateMachine::NoInitialStateError, grp);
return;
}
}
QList<QState*> ancs = properAncestors(s, root);
for (int i = 0; i < ancs.size(); ++i) {
QState *anc = ancs.at(i);
if (!anc->parentState())
continue;
statesToEnter.insert(anc);
if (isParallel(anc)) {
QList<QAbstractState*> lst = QStatePrivate::get(anc)->childStates();
for (int j = 0; j < lst.size(); ++j) {
QAbstractState *child = lst.at(j);
bool hasDescendantInList = false;
QSet<QAbstractState*>::const_iterator it;
for (it = statesToEnter.constBegin(); it != statesToEnter.constEnd(); ++it) {
if (isDescendantOf(*it, child)) {
hasDescendantInList = true;
break;
}
}
if (!hasDescendantInList)
addStatesToEnter(child, anc, statesToEnter, statesForDefaultEntry);
}
}
}
}
}
void QStateMachinePrivate::applyProperties(const QList<QAbstractTransition*> &transitionList,
const QList<QAbstractState*> &exitedStates,
const QList<QAbstractState*> &enteredStates)
{
Q_Q(QStateMachine);
#ifdef QT_NO_ANIMATION
Q_UNUSED(transitionList);
#endif
// Process the property assignments of the entered states.
QHash<QAbstractState*, QList<QPropertyAssignment> > propertyAssignmentsForState;
QHash<RestorableId, QVariant> pendingRestorables = registeredRestorables;
for (int i = 0; i < enteredStates.size(); ++i) {
QState *s = qobject_cast<QState*>(enteredStates.at(i));
if (!s)
continue;
QList<QPropertyAssignment> assignments = QStatePrivate::get(s)->propertyAssignments;
for (int j = 0; j < assignments.size(); ++j) {
const QPropertyAssignment &assn = assignments.at(j);
if (globalRestorePolicy == QStateMachine::RestoreProperties) {
registerRestorable(assn.object, assn.propertyName);
}
pendingRestorables.remove(RestorableId(assn.object, assn.propertyName));
propertyAssignmentsForState[s].append(assn);
}
// Remove pending restorables for all parent states to avoid restoring properties
// before the state that assigned them is exited. If state does not explicitly
// assign a property which is assigned by the parent, it inherits the parent's assignment.
QState *parentState = s;
while ((parentState = parentState->parentState()) != 0) {
assignments = QStatePrivate::get(parentState)->propertyAssignments;
for (int j=0; j<assignments.size(); ++j) {
const QPropertyAssignment &assn = assignments.at(j);
int c = pendingRestorables.remove(RestorableId(assn.object, assn.propertyName));
if (c > 0)
propertyAssignmentsForState[s].append(assn);
}
}
}
if (!pendingRestorables.isEmpty()) {
QAbstractState *s;
if (!enteredStates.isEmpty())
s = enteredStates.last(); // ### handle if parallel
else
s = 0;
propertyAssignmentsForState[s] << restorablesToPropertyList(pendingRestorables);
}
#ifndef QT_NO_ANIMATION
// Gracefully terminate playing animations for states that are exited.
for (int i = 0; i < exitedStates.size(); ++i) {
QAbstractState *s = exitedStates.at(i);
QList<QAbstractAnimation*> animations = animationsForState.take(s);
for (int j = 0; j < animations.size(); ++j) {
QAbstractAnimation *anim = animations.at(j);
QObject::disconnect(anim, SIGNAL(finished()), q, SLOT(_q_animationFinished()));
stateForAnimation.remove(anim);
// Stop the (top-level) animation.
// ### Stopping nested animation has weird behavior.
while (QAnimationGroup *group = anim->group())
anim = group;
anim->stop();
if (resetAnimationEndValues.contains(anim)) {
qobject_cast<QVariantAnimation*>(anim)->setEndValue(QVariant()); // ### generalize
resetAnimationEndValues.remove(anim);
}
QPropertyAssignment assn = propertyForAnimation.take(anim);
Q_ASSERT(assn.object != 0);
// If there is no property assignment that sets this property,
// set the property to its target value.
bool found = false;
QHash<QAbstractState*, QList<QPropertyAssignment> >::const_iterator it;
for (it = propertyAssignmentsForState.constBegin(); it != propertyAssignmentsForState.constEnd(); ++it) {
const QList<QPropertyAssignment> &assignments = it.value();
for (int k = 0; k < assignments.size(); ++k) {
if ((assignments.at(k).object == assn.object)
&& (assignments.at(k).propertyName == assn.propertyName)) {
found = true;
break;
}
}
}
if (!found) {
assn.object->setProperty(assn.propertyName, assn.value);
}
}
}
// Find the animations to use for the state change.
QList<QAbstractAnimation*> selectedAnimations;
if (animationsEnabled) {
for (int i = 0; i < transitionList.size(); ++i) {
QAbstractTransition *transition = transitionList.at(i);
selectedAnimations << transition->animations();
selectedAnimations << defaultAnimationsForSource.values(transition->sourceState());
QList<QAbstractState *> targetStates = transition->targetStates();
for (int j=0; j<targetStates.size(); ++j)
selectedAnimations << defaultAnimationsForTarget.values(targetStates.at(j));
}
selectedAnimations << defaultAnimations;
}
// Initialize animations from property assignments.
for (int i = 0; i < selectedAnimations.size(); ++i) {
QAbstractAnimation *anim = selectedAnimations.at(i);
QHash<QAbstractState*, QList<QPropertyAssignment> >::iterator it;
for (it = propertyAssignmentsForState.begin(); it != propertyAssignmentsForState.end(); ) {
QList<QPropertyAssignment>::iterator it2;
QAbstractState *s = it.key();
QList<QPropertyAssignment> &assignments = it.value();
for (it2 = assignments.begin(); it2 != assignments.end(); ) {
QPair<QList<QAbstractAnimation*>, QList<QAbstractAnimation*> > ret;
ret = initializeAnimation(anim, *it2);
QList<QAbstractAnimation*> handlers = ret.first;
if (!handlers.isEmpty()) {
for (int j = 0; j < handlers.size(); ++j) {
QAbstractAnimation *a = handlers.at(j);
propertyForAnimation.insert(a, *it2);
stateForAnimation.insert(a, s);
animationsForState[s].append(a);
// ### connect to just the top-level animation?
QObject::disconnect(a, SIGNAL(finished()), q, SLOT(_q_animationFinished()));
QObject::connect(a, SIGNAL(finished()), q, SLOT(_q_animationFinished()));
}
it2 = assignments.erase(it2);
} else {
++it2;
}
for (int j = 0; j < ret.second.size(); ++j)
resetAnimationEndValues.insert(ret.second.at(j));
}
if (assignments.isEmpty())
it = propertyAssignmentsForState.erase(it);
else
++it;
}
// We require that at least one animation is valid.
// ### generalize
QList<QVariantAnimation*> variantAnims = qFindChildren<QVariantAnimation*>(anim);
if (QVariantAnimation *va = qobject_cast<QVariantAnimation*>(anim))
variantAnims.append(va);
bool hasValidEndValue = false;
for (int j = 0; j < variantAnims.size(); ++j) {
if (variantAnims.at(j)->endValue().isValid()) {
hasValidEndValue = true;
break;
}
}
if (hasValidEndValue) {
anim->start();
}
}
#endif // !QT_NO_ANIMATION
// Immediately set the properties that are not animated.
{
QHash<QAbstractState*, QList<QPropertyAssignment> >::const_iterator it;
for (it = propertyAssignmentsForState.constBegin(); it != propertyAssignmentsForState.constEnd(); ++it) {
const QList<QPropertyAssignment> &assignments = it.value();
for (int i = 0; i < assignments.size(); ++i) {
const QPropertyAssignment &assn = assignments.at(i);
assn.object->setProperty(assn.propertyName, assn.value);
}
}
}
// Emit polished signal for entered states that have no animated properties.
for (int i = 0; i < enteredStates.size(); ++i) {
QState *s = qobject_cast<QState*>(enteredStates.at(i));
if (s && !animationsForState.contains(s))
QStatePrivate::get(s)->emitPolished();
}
}
bool QStateMachinePrivate::isFinal(const QAbstractState *s)
{
return qobject_cast<const QFinalState*>(s) != 0;
}
bool QStateMachinePrivate::isParallel(const QAbstractState *s)
{
const QState *ss = qobject_cast<const QState*>(s);
return ss && (QStatePrivate::get(ss)->childMode == QState::ParallelStates);
}
bool QStateMachinePrivate::isCompound(const QAbstractState *s)
{
const QState *group = qobject_cast<const QState*>(s);
if (!group)
return false;
return (!isParallel(group) && !QStatePrivate::get(group)->childStates().isEmpty())
|| (qobject_cast<QStateMachine*>(group->parent()) != 0);
}
bool QStateMachinePrivate::isAtomic(const QAbstractState *s)
{
const QState *ss = qobject_cast<const QState*>(s);
return (ss && QStatePrivate::get(ss)->childStates().isEmpty())
|| isFinal(s);
}
bool QStateMachinePrivate::isDescendantOf(const QAbstractState *state, const QAbstractState *other)
{
Q_ASSERT(state != 0);
for (QAbstractState *s = state->parentState(); s != 0; s = s->parentState()) {
if (s == other)
return true;
}
return false;
}
QList<QState*> QStateMachinePrivate::properAncestors(const QAbstractState *state, const QState *upperBound)
{
Q_ASSERT(state != 0);
QList<QState*> result;
for (QState *s = state->parentState(); s && s != upperBound; s = s->parentState()) {
result.append(s);
}
return result;
}
bool QStateMachinePrivate::isInFinalState(QAbstractState* s) const
{
if (isCompound(s)) {
QState *grp = qobject_cast<QState*>(s);
QList<QAbstractState*> lst = QStatePrivate::get(grp)->childStates();
for (int i = 0; i < lst.size(); ++i) {
QAbstractState *cs = lst.at(i);
if (isFinal(cs) && configuration.contains(cs))
return true;
}
return false;
} else if (isParallel(s)) {
QState *grp = qobject_cast<QState*>(s);
QList<QAbstractState*> lst = QStatePrivate::get(grp)->childStates();
for (int i = 0; i < lst.size(); ++i) {
QAbstractState *cs = lst.at(i);
if (!isInFinalState(cs))
return false;
}
return true;
}
else
return false;
}
void QStateMachinePrivate::registerRestorable(QObject *object, const QByteArray &propertyName)
{
RestorableId id(object, propertyName);
if (!registeredRestorables.contains(id))
registeredRestorables.insert(id, object->property(propertyName));
}
QList<QPropertyAssignment> QStateMachinePrivate::restorablesToPropertyList(const QHash<RestorableId, QVariant> &restorables) const
{
QList<QPropertyAssignment> result;
QHash<RestorableId, QVariant>::const_iterator it;
for (it = restorables.constBegin(); it != restorables.constEnd(); ++it) {
// qDebug() << "restorable:" << it.key().first << it.key().second << it.value();
result.append(QPropertyAssignment(it.key().first, it.key().second, it.value(), /*explicitlySet=*/false));
}
return result;
}
/*!
\internal
Returns true if the variable with the given \a id has been registered for restoration.
*/
bool QStateMachinePrivate::hasRestorable(QObject *object, const QByteArray &propertyName) const
{
return registeredRestorables.contains(RestorableId(object, propertyName));
}
QVariant QStateMachinePrivate::restorableValue(QObject *object, const QByteArray &propertyName) const
{
return registeredRestorables.value(RestorableId(object, propertyName), QVariant());
}
/*!
\internal
Unregisters the variable identified by \a id
*/
void QStateMachinePrivate::unregisterRestorable(QObject *object, const QByteArray &propertyName)
{
// qDebug() << "unregisterRestorable(" << object << propertyName << ")";
RestorableId id(object, propertyName);
registeredRestorables.remove(id);
}
QAbstractState *QStateMachinePrivate::findErrorState(QAbstractState *context)
{
// If the user sets the root state's error state to 0, we return the initial error state
if (context == 0)
return initialErrorStateForRoot;
// Find error state recursively in parent hierarchy if not set explicitly for context state
QAbstractState *errorState = 0;
QState *s = qobject_cast<QState*>(context);
if (s) {
errorState = s->errorState();
if (!errorState)
errorState = findErrorState(s->parentState());
return errorState;
}
return errorState;
}
void QStateMachinePrivate::setError(QStateMachine::Error errorCode, QAbstractState *currentContext)
{
error = errorCode;
switch (errorCode) {
case QStateMachine::NoInitialStateError:
Q_ASSERT(currentContext != 0);
errorString = QStateMachine::tr("Missing initial state in compound state '%1'")
.arg(currentContext->objectName());
break;
case QStateMachine::NoDefaultStateInHistoryState:
Q_ASSERT(currentContext != 0);
errorString = QStateMachine::tr("Missing default state in history state '%1'")
.arg(currentContext->objectName());
break;
default:
errorString = QStateMachine::tr("Unknown error");
};
pendingErrorStates.clear();
pendingErrorStatesForDefaultEntry.clear();
QAbstractState *currentErrorState = findErrorState(currentContext);
// Avoid infinite loop if the error state itself has an error
if (currentContext == currentErrorState) {
Q_ASSERT(currentContext != initialErrorStateForRoot); // RootErrorState is broken
currentErrorState = initialErrorStateForRoot;
}
if (currentErrorState) {
QState *lca = findLCA(QList<QAbstractState*>() << currentErrorState << currentContext);
addStatesToEnter(currentErrorState, lca, pendingErrorStates, pendingErrorStatesForDefaultEntry);
}
}
#ifndef QT_NO_ANIMATION
QPair<QList<QAbstractAnimation*>, QList<QAbstractAnimation*> >
QStateMachinePrivate::initializeAnimation(QAbstractAnimation *abstractAnimation,
const QPropertyAssignment &prop)
{
QList<QAbstractAnimation*> handledAnimations;
QList<QAbstractAnimation*> localResetEndValues;
QAnimationGroup *group = qobject_cast<QAnimationGroup*>(abstractAnimation);
if (group) {
for (int i = 0; i < group->animationCount(); ++i) {
QAbstractAnimation *animationChild = group->animationAt(i);
QPair<QList<QAbstractAnimation*>, QList<QAbstractAnimation*> > ret;
ret = initializeAnimation(animationChild, prop);
handledAnimations << ret.first;
localResetEndValues << ret.second;
}
} else {
QPropertyAnimation *animation = qobject_cast<QPropertyAnimation *>(abstractAnimation);
if (animation != 0
&& prop.object == animation->targetObject()
&& prop.propertyName == animation->propertyName()) {
// Only change end value if it is undefined
if (!animation->endValue().isValid()) {
animation->setEndValue(prop.value);
localResetEndValues.append(animation);
}
handledAnimations.append(animation);
}
}
return qMakePair(handledAnimations, localResetEndValues);
}
void QStateMachinePrivate::_q_animationFinished()
{
Q_Q(QStateMachine);
QAbstractAnimation *anim = qobject_cast<QAbstractAnimation*>(q->sender());
Q_ASSERT(anim != 0);
QObject::disconnect(anim, SIGNAL(finished()), q, SLOT(_q_animationFinished()));
if (resetAnimationEndValues.contains(anim)) {
qobject_cast<QVariantAnimation*>(anim)->setEndValue(QVariant()); // ### generalize
resetAnimationEndValues.remove(anim);
}
// Set the final property value.
QPropertyAssignment assn = propertyForAnimation.take(anim);
Q_ASSERT(assn.object != 0);
assn.object->setProperty(assn.propertyName, assn.value);
if (!assn.explicitlySet)
unregisterRestorable(assn.object, assn.propertyName);
QAbstractState *state = stateForAnimation.take(anim);
Q_ASSERT(state != 0);
QHash<QAbstractState*, QList<QAbstractAnimation*> >::iterator it;
it = animationsForState.find(state);
Q_ASSERT(it != animationsForState.end());
QList<QAbstractAnimation*> &animations = it.value();
animations.removeOne(anim);
if (animations.isEmpty()) {
animationsForState.erase(it);
QStatePrivate::get(qobject_cast<QState*>(state))->emitPolished();
}
}
#endif // !QT_NO_ANIMATION
namespace {
class StartState : public QState
{
public:
StartState(QState *parent)
: QState(parent) {}
protected:
void onEntry(QEvent *) {}
void onExit(QEvent *) {}
};
class InitialTransition : public QAbstractTransition
{
public:
InitialTransition(QAbstractState *target)
: QAbstractTransition(QList<QAbstractState*>() << target) {}
protected:
virtual bool eventTest(QEvent *) const { return true; }
virtual void onTransition(QEvent *) {}
};
} // namespace
void QStateMachinePrivate::_q_start()
{
Q_Q(QStateMachine);
Q_ASSERT(state == Starting);
if (!rootState) {
state = NotRunning;
return;
}
QAbstractState *initial = rootState->initialState();
if (initial == 0)
setError(QStateMachine::NoInitialStateError, rootState);
configuration.clear();
qDeleteAll(internalEventQueue);
internalEventQueue.clear();
qDeleteAll(externalEventQueue);
externalEventQueue.clear();
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q << ": starting";
#endif
state = Running;
processingScheduled = true; // we call _q_process() below
emit q->started();
StartState *start = new StartState(rootState);
QAbstractTransition *initialTransition = new InitialTransition(initial);
start->addTransition(initialTransition);
QList<QAbstractTransition*> transitions;
transitions.append(initialTransition);
QEvent nullEvent(QEvent::None);
executeTransitionContent(&nullEvent, transitions);
enterStates(&nullEvent, transitions);
applyProperties(transitions, QList<QAbstractState*>() << start,
QList<QAbstractState*>() << initial);
delete start;
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q << ": initial configuration:" << configuration;
#endif
_q_process();
}
void QStateMachinePrivate::_q_process()
{
Q_Q(QStateMachine);
Q_ASSERT(state == Running);
Q_ASSERT(!processing);
processing = true;
processingScheduled = false;
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q << ": starting the event processing loop";
#endif
while (processing) {
if (stop) {
stop = false;
processing = false;
stopProcessingReason = Stopped;
break;
}
QSet<QAbstractTransition*> enabledTransitions;
QEvent *e = new QEvent(QEvent::None);
enabledTransitions = selectTransitions(e);
if (enabledTransitions.isEmpty()) {
delete e;
e = 0;
}
if (enabledTransitions.isEmpty() && !internalEventQueue.isEmpty()) {
e = internalEventQueue.takeFirst();
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q << ": dequeued internal event" << e << "of type" << e->type();
#endif
enabledTransitions = selectTransitions(e);
if (enabledTransitions.isEmpty()) {
delete e;
e = 0;
}
}
if (enabledTransitions.isEmpty()) {
if (externalEventQueue.isEmpty()) {
if (internalEventQueue.isEmpty()) {
processing = false;
stopProcessingReason = EventQueueEmpty;
}
} else {
e = externalEventQueue.takeFirst();
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q << ": dequeued external event" << e << "of type" << e->type();
#endif
enabledTransitions = selectTransitions(e);
if (enabledTransitions.isEmpty()) {
delete e;
e = 0;
}
}
}
if (!enabledTransitions.isEmpty()) {
q->beginMicrostep(e);
microstep(e, enabledTransitions.toList());
q->endMicrostep(e);
}
#ifdef QSTATEMACHINE_DEBUG
else {
qDebug() << q << ": no transitions enabled";
}
#endif
delete e;
}
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q << ": finished the event processing loop";
#endif
switch (stopProcessingReason) {
case EventQueueEmpty:
break;
case Finished:
state = NotRunning;
emit q->finished();
break;
case Stopped:
state = NotRunning;
emit q->stopped();
break;
}
}
void QStateMachinePrivate::scheduleProcess()
{
if ((state != Running) || processing || processingScheduled)
return;
processingScheduled = true;
QMetaObject::invokeMethod(q_func(), "_q_process", Qt::QueuedConnection);
}
void QStateMachinePrivate::registerTransitions(QAbstractState *state)
{
QState *group = qobject_cast<QState*>(state);
if (!group)
return;
QList<QAbstractTransition*> transitions = QStatePrivate::get(group)->transitions();
for (int i = 0; i < transitions.size(); ++i) {
QAbstractTransition *t = transitions.at(i);
if (QSignalTransition *st = qobject_cast<QSignalTransition*>(t)) {
registerSignalTransition(st);
}
#ifndef QT_NO_STATEMACHINE_EVENTFILTER
else if (QEventTransition *oet = qobject_cast<QEventTransition*>(t)) {
registerEventTransition(oet);
}
#endif
}
}
void QStateMachinePrivate::unregisterTransition(QAbstractTransition *transition)
{
if (QSignalTransition *st = qobject_cast<QSignalTransition*>(transition)) {
unregisterSignalTransition(st);
}
#ifndef QT_NO_STATEMACHINE_EVENTFILTER
else if (QEventTransition *oet = qobject_cast<QEventTransition*>(transition)) {
unregisterEventTransition(oet);
}
#endif
}
#ifndef QT_STATEMACHINE_SOLUTION
static int senderSignalIndex(const QObject *sender)
{
QObjectPrivate *d = QObjectPrivate::get(const_cast<QObject*>(sender));
QMutexLocker(&d->threadData->mutex);
if (!d->currentSender)
return -1;
// Return -1 if d->currentSender isn't in d->senders
bool found = false;
for (int i = 0; !found && i < d->senders.count(); ++i)
found = (d->senders.at(i).sender == d->currentSender->sender);
if (!found)
return -1;
return d->currentSender->signal;
}
#endif
void QStateMachinePrivate::registerSignalTransition(QSignalTransition *transition)
{
Q_Q(QStateMachine);
if (QSignalTransitionPrivate::get(transition)->signalIndex != -1)
return; // already registered
QObject *sender = QSignalTransitionPrivate::get(transition)->sender;
if (!sender)
return;
QByteArray signal = QSignalTransitionPrivate::get(transition)->signal;
if (signal.startsWith('0'+QSIGNAL_CODE))
signal.remove(0, 1);
int signalIndex = sender->metaObject()->indexOfSignal(signal);
if (signalIndex == -1) {
qWarning("QSignalTransition: no such signal: %s::%s",
sender->metaObject()->className(), signal.constData());
return;
}
QList<int> &connectedSignalIndexes = connections[sender];
if (!connectedSignalIndexes.contains(signalIndex)) {
#ifndef QT_STATEMACHINE_SOLUTION
if (!signalEventGenerator)
signalEventGenerator = new QSignalEventGenerator(q);
#else
QSignalEventGenerator *signalEventGenerator = new QSignalEventGenerator(signalIndex, q);
#endif
bool ok = QMetaObject::connect(sender, signalIndex, signalEventGenerator,
signalEventGenerator->metaObject()->methodOffset());
if (!ok) {
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q << ": FAILED to add signal transition from" << transition->sourceState()
<< ": ( sender =" << sender << ", signal =" << (signal.mid(1))
<< ", targets =" << transition->targetStates() << ")";
#endif
return;
}
connectedSignalIndexes.append(signalIndex);
}
QSignalTransitionPrivate::get(transition)->signalIndex = signalIndex;
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q << ": added signal transition from" << transition->sourceState()
<< ": ( sender =" << sender << ", signal =" << (signal.mid(1))
<< ", targets =" << transition->targetStates() << ")";
#endif
}
void QStateMachinePrivate::unregisterSignalTransition(QSignalTransition *transition)
{
int signalIndex = QSignalTransitionPrivate::get(transition)->signalIndex;
if (signalIndex == -1)
return; // not registered
#ifndef QT_STATEMACHINE_SOLUTION
const QObject *sender = QSignalTransitionPrivate::get(transition)->sender;
QList<int> &connectedSignalIndexes = connections[sender];
Q_ASSERT(connectedSignalIndexes.contains(signalIndex));
Q_ASSERT(signalEventGenerator != 0);
bool ok = QMetaObject::disconnect(sender, signalIndex, signalEventGenerator,
signalEventGenerator->metaObject()->methodOffset());
if (ok) {
connectedSignalIndexes.removeOne(signalIndex);
if (connectedSignalIndexes.isEmpty())
connections.remove(sender);
QSignalTransitionPrivate::get(transition)->signalIndex = -1;
}
#endif
}
#ifndef QT_NO_STATEMACHINE_EVENTFILTER
void QStateMachinePrivate::registerEventTransition(QEventTransition *transition)
{
Q_Q(QStateMachine);
if (QEventTransitionPrivate::get(transition)->registered)
return;
if (transition->eventType() >= QEvent::User) {
qWarning("QObject event transitions are not supported for custom types");
return;
}
QObject *object = QEventTransitionPrivate::get(transition)->object;
if (!object)
return;
#ifndef QT_STATEMACHINE_SOLUTION
QObjectPrivate *od = QObjectPrivate::get(object);
if (!od->eventFilters.contains(q))
#endif
object->installEventFilter(q);
qobjectEvents[object].insert(transition->eventType());
QEventTransitionPrivate::get(transition)->registered = true;
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q << ": added event transition from" << transition->sourceState()
<< ": ( object =" << object << ", event =" << transition->eventType()
<< ", targets =" << transition->targetStates() << ")";
#endif
}
void QStateMachinePrivate::unregisterEventTransition(QEventTransition *transition)
{
Q_Q(QStateMachine);
if (!QEventTransitionPrivate::get(transition)->registered)
return;
QObject *object = QEventTransitionPrivate::get(transition)->object;
QSet<QEvent::Type> &events = qobjectEvents[object];
events.remove(transition->eventType());
if (events.isEmpty()) {
qobjectEvents.remove(object);
object->removeEventFilter(q);
}
QEventTransitionPrivate::get(transition)->registered = false;
}
#endif
void QStateMachinePrivate::handleTransitionSignal(const QObject *sender, int signalIndex,
void **argv)
{
const QList<int> &connectedSignalIndexes = connections[sender];
Q_ASSERT(connectedSignalIndexes.contains(signalIndex));
const QMetaObject *meta = sender->metaObject();
QMetaMethod method = meta->method(signalIndex);
QList<QByteArray> parameterTypes = method.parameterTypes();
int argc = parameterTypes.count();
QList<QVariant> vargs;
for (int i = 0; i < argc; ++i) {
int type = QMetaType::type(parameterTypes.at(i));
vargs.append(QVariant(type, argv[i+1]));
}
#ifdef QSTATEMACHINE_DEBUG
qDebug() << q_func() << ": sending signal event ( sender =" << sender
<< ", signal =" << sender->metaObject()->method(signalIndex).signature() << ")";
#endif
internalEventQueue.append(new QSignalEvent(sender, signalIndex, vargs));
scheduleProcess();
}
/*!
Constructs a new state machine with the given \a parent.
*/
QStateMachine::QStateMachine(QObject *parent)
: QObject(
#ifndef QT_STATEMACHINE_SOLUTION
*new QStateMachinePrivate,
#endif
parent)
#ifdef QT_STATEMACHINE_SOLUTION
, d_ptr(new QStateMachinePrivate)
#endif
{
#ifdef QT_STATEMACHINE_SOLUTION
d_ptr->q_ptr = this;
#endif
}
/*!
\internal
*/
QStateMachine::QStateMachine(QStateMachinePrivate &dd, QObject *parent)
: QObject(
#ifndef QT_STATEMACHINE_SOLUTION
dd,
#endif
parent)
#ifdef QT_STATEMACHINE_SOLUTION
, d_ptr(&dd)
#endif
{
#ifdef QT_STATEMACHINE_SOLUTION
d_ptr->q_ptr = this;
#endif
}
/*!
Destroys this state machine.
*/
QStateMachine::~QStateMachine()
{
#ifdef QT_STATEMACHINE_SOLUTION
delete d_ptr;
#endif
}
namespace {
class RootErrorState : public QAbstractState
{
public:
RootErrorState(QState *parent)
: QAbstractState(parent)
{
setObjectName(QString::fromLatin1("DefaultErrorState"));
}
void onEntry(QEvent *)
{
QAbstractStatePrivate *d = QAbstractStatePrivate::get(this);
QStateMachine *machine = d->machine();
qWarning("Unrecoverable error detected in running state machine: %s",
qPrintable(machine->errorString()));
}
void onExit(QEvent *) {}
};
class RootState : public QState
{
public:
RootState(QState *parent)
: QState(parent)
{
}
void onEntry(QEvent *) {}
void onExit(QEvent *) {}
};
} // namespace
/*!
Returns this state machine's root state.
*/
QState *QStateMachine::rootState() const
{
Q_D(const QStateMachine);
if (!d->rootState) {
const_cast<QStateMachinePrivate*>(d)->rootState = new RootState(0);
const_cast<QStateMachinePrivate*>(d)->initialErrorStateForRoot = new RootErrorState(d->rootState);
d->rootState->setParent(const_cast<QStateMachine*>(this));
d->rootState->setErrorState(d->initialErrorStateForRoot);
}
return d->rootState;
}
/*!
Returns the error state of the state machine's root state.
\sa QState::errorState()
*/
QAbstractState *QStateMachine::errorState() const
{
return rootState()->errorState();
}
/*!
Sets the error state of this state machine's root state to be \a state. When a running state
machine encounters an error which puts it in an undefined state, it will enter an error state
based on the context of the error that occurred. It will enter this state regardless of what
is currently in the event queue.
If the erroneous state has an error state set, this will be entered by the machine. If no error
state has been set, the state machine will search the parent hierarchy recursively for an
error state. The error state of the root state can thus be seen as a global error state that
applies for the states for which a more specific error state has not been set.
Before entering the error state, the state machine will set the error code returned by error() and
error message returned by errorString().
The default error state will print a warning to the console containing the information returned by
errorString(). By setting a new error state on either the state machine itself, or on specific
states, you can fine tune error handling in the state machine.
If the root state's error state is set to 0, or if the error state selected by the machine itself
contains an error, the default error state will be used.
\sa QState::setErrorState(), rootState()
*/
void QStateMachine::setErrorState(QAbstractState *state)
{
rootState()->setErrorState(state);
}
/*! \enum QStateMachine::Error
This enum type defines errors that can occur in the state machine at run time. When the state
machine encounters an unrecoverable error at run time, it will set the error code returned
by error(), the error message returned by errorString(), and enter an error state based on
the context of the error.
\value NoError No error has occurred.
\value NoInitialStateError The machine has entered a QState with children which does not have an
initial state set. The context of this error is the state which is missing an initial
state.
\value NoDefaultStateInHistoryState The machine has entered a QHistoryState which does not have
a default state set. The context of this error is the QHistoryState which is missing a
default state.
\sa setErrorState()
*/
/*!
\enum QStateMachine::RestorePolicy
This enum specifies the restore policy type. The restore policy
takes effect when the machine enters a state which sets one or more
properties. If the restore policy is set to RestoreProperties,
the state machine will save the original value of the property before the
new value is set.
Later, when the machine either enters a state which does not set
a value for the given property, the property will automatically be restored
to its initial value.
Only one initial value will be saved for any given property. If a value for a property has
already been saved by the state machine, it will not be overwritten until the property has been
successfully restored.
\value DoNotRestoreProperties The state machine should not save the initial values of properties
and restore them later.
\value RestoreProperties The state machine should save the initial values of properties
and restore them later.
\sa QStateMachine::globalRestorePolicy QState::assignProperty()
*/
/*!
Returns the error code of the last error that occurred in the state machine.
*/
QStateMachine::Error QStateMachine::error() const
{
Q_D(const QStateMachine);
return d->error;
}
/*!
Returns the error string of the last error that occurred in the state machine.
*/
QString QStateMachine::errorString() const
{
Q_D(const QStateMachine);
return d->errorString;
}
/*!
Clears the error string and error code of the state machine.
*/
void QStateMachine::clearError()
{
Q_D(QStateMachine);
d->errorString.clear();
d->error = NoError;
}
/*!
Returns the restore policy of the state machine.
\sa setGlobalRestorePolicy()
*/
QStateMachine::RestorePolicy QStateMachine::globalRestorePolicy() const
{
Q_D(const QStateMachine);
return d->globalRestorePolicy;
}
/*!
Sets the restore policy of the state machine to \a restorePolicy. The default
restore policy is QAbstractState::DoNotRestoreProperties.
\sa globalRestorePolicy()
*/
void QStateMachine::setGlobalRestorePolicy(QStateMachine::RestorePolicy restorePolicy)
{
Q_D(QStateMachine);
d->globalRestorePolicy = restorePolicy;
}
/*!
Returns this state machine's initial state, or 0 if no initial state has
been set.
*/
QAbstractState *QStateMachine::initialState() const
{
Q_D(const QStateMachine);
if (!d->rootState)
return 0;
return d->rootState->initialState();
}
/*!
Sets this state machine's initial \a state.
*/
void QStateMachine::setInitialState(QAbstractState *state)
{
Q_D(QStateMachine);
if (!d->rootState) {
if (!state)
return;
rootState()->setInitialState(state);
}
d->rootState->setInitialState(state);
}
/*!
Adds the given \a state to this state machine. The state becomes a top-level
state (i.e. a child of the rootState()).
If the state is already in a different machine, it will first be removed
from its old machine, and then added to this machine.
\sa removeState(), rootState(), setInitialState()
*/
void QStateMachine::addState(QAbstractState *state)
{
if (!state) {
qWarning("QStateMachine::addState: cannot add null state");
return;
}
if (QAbstractStatePrivate::get(state)->machine() == this) {
qWarning("QStateMachine::addState: state has already been added to this machine");
return;
}
state->setParent(rootState());
}
/*!
Removes the given \a state from this state machine. The state machine
releases ownership of the state.
\sa addState()
*/
void QStateMachine::removeState(QAbstractState *state)
{
if (!state) {
qWarning("QStateMachine::removeState: cannot remove null state");
return;
}
if (QAbstractStatePrivate::get(state)->machine() != this) {
qWarning("QStateMachine::removeState: state %p's machine (%p)"
" is different from this machine (%p)",
state, QAbstractStatePrivate::get(state)->machine(), this);
return;
}
state->setParent(0);
}
/*!
Starts this state machine. The machine will reset its configuration and
transition to the initial state. When a final top-level state (QFinalState)
is entered, the machine will emit the finished() signal.
\sa started(), finished(), stop(), initialState()
*/
void QStateMachine::start()
{
Q_D(QStateMachine);
if (rootState()->initialState() == 0) {
qWarning("QStateMachine::start: No initial state set for machine. Refusing to start.");
return;
}
switch (d->state) {
case QStateMachinePrivate::NotRunning:
d->state = QStateMachinePrivate::Starting;
QMetaObject::invokeMethod(this, "_q_start", Qt::QueuedConnection);
break;
case QStateMachinePrivate::Starting:
break;
case QStateMachinePrivate::Running:
qWarning("QStateMachine::start(): already running");
break;
}
}
/*!
Stops this state machine. The state machine will stop processing events and
then emit the stopped() signal.
\sa stopped(), start()
*/
void QStateMachine::stop()
{
Q_D(QStateMachine);
switch (d->state) {
case QStateMachinePrivate::NotRunning:
break;
case QStateMachinePrivate::Starting:
// the machine will exit as soon as it enters the event processing loop
d->stop = true;
break;
case QStateMachinePrivate::Running:
d->stop = true;
d->scheduleProcess();
break;
}
}
/*!
Posts the given \a event for processing by this state machine, with a delay
of \a delay milliseconds.
This function returns immediately. The event is added to the state machine's
event queue. Events are processed in the order posted. The state machine
takes ownership of the event and deletes it once it has been processed.
You can only post events when the state machine is running.
*/
void QStateMachine::postEvent(QEvent *event, int delay)
{
Q_D(QStateMachine);
if (d->state != QStateMachinePrivate::Running) {
qWarning("QStateMachine::postEvent: cannot post event when the state machine is not running");
return;
}
#ifdef QSTATEMACHINE_DEBUG
qDebug() << this << ": posting external event" << event << "with delay" << delay;
#endif
if (delay) {
int tid = startTimer(delay);
d->delayedEvents[tid] = event;
} else {
d->externalEventQueue.append(event);
d->scheduleProcess();
}
}
/*!
\internal
Posts the given internal \a event for processing by this state machine.
*/
void QStateMachine::postInternalEvent(QEvent *event)
{
Q_D(QStateMachine);
#ifdef QSTATEMACHINE_DEBUG
qDebug() << this << ": posting internal event" << event;
#endif
d->internalEventQueue.append(event);
d->scheduleProcess();
}
/*!
\internal
Returns the maximal consistent set of states (including parallel and final
states) that this state machine is currently in. If a state \c s is in the
configuration, it is always the case that the parent of \c s is also in
c. Note, however, that the rootState() is not an explicit member of the
configuration.
*/
QSet<QAbstractState*> QStateMachine::configuration() const
{
Q_D(const QStateMachine);
return d->configuration;
}
/*!
\fn QStateMachine::started()
This signal is emitted when the state machine has entered its initial state
(QStateMachine::initialState).
\sa QStateMachine::finished(), QStateMachine::start()
*/
/*!
\fn QStateMachine::finished()
This signal is emitted when the state machine has reached a top-level final
state (QFinalState).
\sa QStateMachine::started()
*/
/*!
\fn QStateMachine::stopped()
This signal is emitted when the state machine has stopped.
\sa QStateMachine::stop(), QStateMachine::finished()
*/
/*!
\reimp
*/
bool QStateMachine::event(QEvent *e)
{
Q_D(QStateMachine);
if (e->type() == QEvent::Timer) {
QTimerEvent *te = static_cast<QTimerEvent*>(e);
int tid = te->timerId();
if (d->delayedEvents.contains(tid)) {
killTimer(tid);
QEvent *ee = d->delayedEvents.take(tid);
d->externalEventQueue.append(ee);
d->scheduleProcess();
return true;
}
} else if (e->type() == QEvent::ChildAdded) {
QChildEvent *ce = static_cast<QChildEvent*>(e);
if (QAbstractState *state = qobject_cast<QAbstractState*>(ce->child())) {
if (state != rootState()) {
state->setParent(rootState());
return true;
}
}
}
return QObject::event(e);
}
#ifndef QT_NO_STATEMACHINE_EVENTFILTER
/*!
\reimp
*/
bool QStateMachine::eventFilter(QObject *watched, QEvent *event)
{
Q_D(QStateMachine);
Q_ASSERT(d->qobjectEvents.contains(watched));
if (d->qobjectEvents[watched].contains(event->type()))
postEvent(new QWrappedEvent(watched, d->handler->cloneEvent(event)));
return false;
}
#endif
/*!
\internal
This function is called when the state machine is about to select
transitions based on the given \a event.
The default implementation does nothing.
*/
void QStateMachine::beginSelectTransitions(QEvent *event)
{
Q_UNUSED(event);
}
/*!
\internal
This function is called when the state machine has finished selecting
transitions based on the given \a event.
The default implementation does nothing.
*/
void QStateMachine::endSelectTransitions(QEvent *event)
{
Q_UNUSED(event);
}
/*!
\internal
This function is called when the state machine is about to do a microstep.
The default implementation does nothing.
*/
void QStateMachine::beginMicrostep(QEvent *event)
{
Q_UNUSED(event);
}
/*!
\internal
This function is called when the state machine has finished doing a
microstep.
The default implementation does nothing.
*/
void QStateMachine::endMicrostep(QEvent *event)
{
Q_UNUSED(event);
}
#ifndef QT_NO_ANIMATION
/*!
Returns whether animations are enabled for this state machine.
*/
bool QStateMachine::animationsEnabled() const
{
Q_D(const QStateMachine);
return d->animationsEnabled;
}
/*!
Sets whether animations are \a enabled for this state machine.
*/
void QStateMachine::setAnimationsEnabled(bool enabled)
{
Q_D(QStateMachine);
d->animationsEnabled = enabled;
}
/*!
Adds a default \a animation to be considered for any transition.
*/
void QStateMachine::addDefaultAnimation(QAbstractAnimation *animation)
{
Q_D(QStateMachine);
d->defaultAnimations.append(animation);
}
/*!
Returns the list of default animations that will be considered for any transition.
*/
QList<QAbstractAnimation*> QStateMachine::defaultAnimations() const
{
Q_D(const QStateMachine);
return d->defaultAnimations;
}
/*!
Removes \a animation from the list of default animations.
*/
void QStateMachine::removeDefaultAnimation(QAbstractAnimation *animation)
{
Q_D(QStateMachine);
d->defaultAnimations.removeAll(animation);
}
#endif // QT_NO_ANIMATION
static const uint qt_meta_data_QSignalEventGenerator[] = {
// content:
2, // revision
0, // classname
0, 0, // classinfo
1, 12, // methods
0, 0, // properties
0, 0, // enums/sets
0, 0, // constructors
// slots: signature, parameters, type, tag, flags
23, 22, 22, 22, 0x0a,
0 // eod
};
static const char qt_meta_stringdata_QSignalEventGenerator[] = {
"QSignalEventGenerator\0\0execute()\0"
};
const QMetaObject QSignalEventGenerator::staticMetaObject = {
{ &QObject::staticMetaObject, qt_meta_stringdata_QSignalEventGenerator,
qt_meta_data_QSignalEventGenerator, 0 }
};
const QMetaObject *QSignalEventGenerator::metaObject() const
{
return &staticMetaObject;
}
void *QSignalEventGenerator::qt_metacast(const char *_clname)
{
if (!_clname) return 0;
if (!strcmp(_clname, qt_meta_stringdata_QSignalEventGenerator))
return static_cast<void*>(const_cast< QSignalEventGenerator*>(this));
return QObject::qt_metacast(_clname);
}
int QSignalEventGenerator::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
{
_id = QObject::qt_metacall(_c, _id, _a);
if (_id < 0)
return _id;
if (_c == QMetaObject::InvokeMetaMethod) {
switch (_id) {
case 0: {
#ifndef QT_STATEMACHINE_SOLUTION
// ### in Qt 4.6 we can use QObject::senderSignalIndex()
int signalIndex = senderSignalIndex(this);
Q_ASSERT(signalIndex != -1);
#endif
QStateMachine *machine = qobject_cast<QStateMachine*>(parent());
QStateMachinePrivate::get(machine)->handleTransitionSignal(sender(), signalIndex, _a);
break;
}
default: ;
}
_id -= 1;
}
return _id;
}
QSignalEventGenerator::QSignalEventGenerator(
#ifdef QT_STATEMACHINE_SOLUTION
int sigIdx,
#endif
QStateMachine *parent)
: QObject(parent)
#ifdef QT_STATEMACHINE_SOLUTION
, signalIndex(sigIdx)
#endif
{
}
/*!
\class QSignalEvent
\brief The QSignalEvent class represents a Qt signal event.
\since 4.6
\ingroup statemachine
A signal event is generated by a QStateMachine in response to a Qt
signal. The QSignalTransition class provides a transition associated with a
signal event. QSignalEvent is part of \l{The State Machine Framework}.
The sender() function returns the object that generated the signal. The
signalIndex() function returns the index of the signal. The arguments()
function returns the arguments of the signal.
\sa QSignalTransition
*/
/*!
\internal
Constructs a new QSignalEvent object with the given \a sender, \a
signalIndex and \a arguments.
*/
QSignalEvent::QSignalEvent(const QObject *sender, int signalIndex,
const QList<QVariant> &arguments)
:
#ifndef QT_STATEMACHINE_SOLUTION
QEvent(QEvent::Signal)
#else
QEvent(QEvent::Type(QEvent::User-1))
#endif
, m_sender(sender), m_signalIndex(signalIndex), m_arguments(arguments)
{
}
/*!
Destroys this QSignalEvent.
*/
QSignalEvent::~QSignalEvent()
{
}
/*!
\fn QSignalEvent::sender() const
Returns the object that emitted the signal.
\sa QObject::sender()
*/
/*!
\fn QSignalEvent::signalIndex() const
Returns the index of the signal.
\sa QMetaObject::indexOfSignal(), QMetaObject::method()
*/
/*!
\fn QSignalEvent::arguments() const
Returns the arguments of the signal.
*/
/*!
\class QWrappedEvent
\brief The QWrappedEvent class holds a clone of an event associated with a QObject.
\since 4.6
\ingroup statemachine
A wrapped event is generated by a QStateMachine in response to a Qt
event. The QEventTransition class provides a transition associated with a
such an event. QWrappedEvent is part of \l{The State Machine Framework}.
The object() function returns the object that generated the event. The
event() function returns a clone of the original event.
\sa QEventTransition
*/
/*!
\internal
Constructs a new QWrappedEvent object with the given \a object
and \a event.
*/
QWrappedEvent::QWrappedEvent(QObject *object, QEvent *event)
#ifdef QT_STATEMACHINE_SOLUTION
: QEvent(QEvent::Type(QEvent::User-3))
#else
: QEvent(QEvent::Wrapped)
#endif
, m_object(object), m_event(event)
{
}
/*!
Destroys this QWrappedEvent.
*/
QWrappedEvent::~QWrappedEvent()
{
}
/*!
\fn QWrappedEvent::object() const
Returns the object that the event is associated with.
*/
/*!
\fn QWrappedEvent::event() const
Returns a clone of the original event.
*/
QT_END_NAMESPACE
#include "moc_qstatemachine.cpp"
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