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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative 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 Technology Preview License Agreement accompanying
** this package.
**
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "private/qobject_p.h"
#include "qmlstategroup_p.h"
#include "qmltransition_p.h"
#include "qmlstate_p_p.h"
#include <qmlbinding.h>
#include <QtCore/qdebug.h>
#include "qmlglobal_p.h"
QT_BEGIN_NAMESPACE
DEFINE_BOOL_CONFIG_OPTION(stateChangeDebug, STATECHANGE_DEBUG);
QML_DEFINE_TYPE(Qt,4,6,StateGroup,QmlStateGroup)
class QmlStateGroupPrivate : public QObjectPrivate
{
Q_DECLARE_PUBLIC(QmlStateGroup)
public:
QmlStateGroupPrivate(QmlStateGroup *p)
: nullState(0), states(p), componentComplete(true),
ignoreTrans(false), applyingState(false) {}
QString currentState;
QmlState *nullState;
struct StateList : public QmlConcreteList<QmlState *>
{
StateList(QmlStateGroup *g)
:group(g) {}
void append(QmlState *s) {
QmlConcreteList<QmlState *>::append(s);
if (s) s->setStateGroup(group);
}
private:
QmlStateGroup *group;
};
StateList states;
QmlConcreteList<QmlTransition *> transitions;
bool componentComplete;
bool ignoreTrans;
bool applyingState;
QmlTransition *findTransition(const QString &from, const QString &to);
void setCurrentStateInternal(const QString &state, bool = false);
void updateAutoState();
};
/*!
\qmlclass StateGroup QmlStateGroup
\brief The StateGroup element provides state support for non-Item elements.
Item (and all dervied elements) provides built in support for states and transitions
via its state, states and transitions properties. StateGroup provides an easy way to
use this support in other (non-Item-derived) elements.
\qml
MyCustomObject {
StateGroup {
id: myStateGroup
states: State {
name: "state1"
...
}
transitions: Transition {
...
}
}
onSomethingHappened: myStateGroup.state = "state1";
}
\endqml
\sa {qmlstate}{States} {state-transitions}{Transitions}
*/
QmlStateGroup::QmlStateGroup(QObject *parent)
: QObject(*(new QmlStateGroupPrivate(this)), parent)
{
}
QmlStateGroup::~QmlStateGroup()
{
Q_D(const QmlStateGroup);
for (int i = 0; i < d->states.count(); ++i)
d->states.at(i)->setStateGroup(0);
}
QList<QmlState *> QmlStateGroup::states() const
{
Q_D(const QmlStateGroup);
return d->states;
}
/*!
\qmlproperty list<State> StateGroup::states
This property holds a list of states defined by the state group.
\qml
StateGroup {
states: [
State { ... },
State { ... }
...
]
}
\endqml
\sa {qmlstate}{States}
*/
QmlList<QmlState *>* QmlStateGroup::statesProperty()
{
Q_D(QmlStateGroup);
return &(d->states);
}
/*!
\qmlproperty list<Transition> StateGroup::transitions
This property holds a list of transitions defined by the state group.
\qml
StateGroup {
transitions: [
Transition { ... },
Transition { ... }
...
]
}
\endqml
\sa {state-transitions}{Transitions}
*/
QmlList<QmlTransition *>* QmlStateGroup::transitionsProperty()
{
Q_D(QmlStateGroup);
return &(d->transitions);
}
/*!
\qmlproperty string StateGroup::state
This property holds the name of the current state of the state group.
This property is often used in scripts to change between states. For
example:
\qml
Script {
function toggle() {
if (button.state == 'On')
button.state = 'Off';
else
button.state = 'On';
}
}
\endqml
If the state group is in its base state (i.e. no explicit state has been
set), \c state will be a blank string. Likewise, you can return a
state group to its base state by setting its current state to \c ''.
\sa {qmlstates}{States}
*/
QString QmlStateGroup::state() const
{
Q_D(const QmlStateGroup);
return d->currentState;
}
void QmlStateGroup::setState(const QString &state)
{
Q_D(QmlStateGroup);
if (d->currentState == state)
return;
d->setCurrentStateInternal(state);
}
void QmlStateGroup::classBegin()
{
Q_D(QmlStateGroup);
d->componentComplete = false;
}
void QmlStateGroup::componentComplete()
{
Q_D(QmlStateGroup);
d->componentComplete = true;
d->updateAutoState();
if (!d->currentState.isEmpty()) {
QString cs = d->currentState;
d->currentState = QString();
d->setCurrentStateInternal(cs, true);
}
}
void QmlStateGroup::updateAutoState()
{
Q_D(QmlStateGroup);
d->updateAutoState();
}
void QmlStateGroupPrivate::updateAutoState()
{
Q_Q(QmlStateGroup);
if (!componentComplete)
return;
bool revert = false;
for (int ii = 0; ii < states.count(); ++ii) {
QmlState *state = states.at(ii);
if (state->isWhenKnown()) {
if (!state->name().isEmpty()) {
if (state->when() && state->when()->value().toBool()) {
if (stateChangeDebug())
qWarning() << "Setting auto state due to:"
<< state->when()->expression();
q->setState(state->name());
return;
} else if (state->name() == currentState) {
revert = true;
}
}
}
}
if (revert)
q->setState(QString());
}
QmlTransition *QmlStateGroupPrivate::findTransition(const QString &from, const QString &to)
{
QmlTransition *highest = 0;
int score = 0;
bool reversed = false;
bool done = false;
for (int ii = 0; !done && ii < transitions.count(); ++ii) {
QmlTransition *t = transitions.at(ii);
for (int ii = 0; ii < 2; ++ii)
{
if (ii && (!t->reversible() ||
(t->fromState() == QLatin1String("*") &&
t->toState() == QLatin1String("*"))))
break;
QStringList fromState;
QStringList toState;
fromState = t->fromState().split(QLatin1Char(','));
toState = t->toState().split(QLatin1Char(','));
if (ii == 1)
qSwap(fromState, toState);
int tScore = 0;
if (fromState.contains(from))
tScore += 2;
else if (fromState.contains(QLatin1String("*")))
tScore += 1;
else
continue;
if (toState.contains(to))
tScore += 2;
else if (toState.contains(QLatin1String("*")))
tScore += 1;
else
continue;
if (ii == 1)
reversed = true;
else
reversed = false;
if (tScore == 4) {
highest = t;
done = true;
break;
} else if (tScore > score) {
score = tScore;
highest = t;
}
}
}
if (highest)
highest->setReversed(reversed);
return highest;
}
void QmlStateGroupPrivate::setCurrentStateInternal(const QString &state,
bool ignoreTrans)
{
Q_Q(QmlStateGroup);
if (!componentComplete) {
currentState = state;
return;
}
if (applyingState) {
qWarning() << "Can't apply a state change as part of a state definition.";
return;
}
applyingState = true;
QmlTransition *transition = (ignoreTrans || ignoreTrans) ? 0 : findTransition(currentState, state);
if (stateChangeDebug()) {
qWarning() << this << "Changing state. From" << currentState << ". To" << state;
if (transition)
qWarning() << " using transition" << transition->fromState()
<< transition->toState();
}
QmlState *oldState = 0;
if (!currentState.isEmpty()) {
for (int ii = 0; ii < states.count(); ++ii) {
if (states.at(ii)->name() == currentState) {
oldState = states.at(ii);
break;
}
}
}
currentState = state;
emit q->stateChanged(currentState);
QmlState *newState = 0;
for (int ii = 0; ii < states.count(); ++ii) {
if (states.at(ii)->name() == currentState) {
newState = states.at(ii);
break;
}
}
if (oldState == 0 || newState == 0) {
if (!nullState) { nullState = new QmlState; QmlGraphics_setParent_noEvent(nullState, q); }
if (!oldState) oldState = nullState;
if (!newState) newState = nullState;
}
newState->apply(q, transition, oldState);
applyingState = false;
if (!transition)
static_cast<QmlStatePrivate*>(QObjectPrivate::get(newState))->complete();
}
QmlState *QmlStateGroup::findState(const QString &name) const
{
Q_D(const QmlStateGroup);
for (int i = 0; i < d->states.count(); ++i) {
QmlState *state = d->states.at(i);
if (state->name() == name)
return state;
}
return 0;
}
void QmlStateGroup::removeState(QmlState *state)
{
Q_D(QmlStateGroup);
d->states.removeOne(state);
}
QT_END_NAMESPACE
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