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Diffstat (limited to 'src/declarative/util/qmltransitionmanager.cpp')
| -rw-r--r-- | src/declarative/util/qmltransitionmanager.cpp | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/src/declarative/util/qmltransitionmanager.cpp b/src/declarative/util/qmltransitionmanager.cpp new file mode 100644 index 0000000..a3a16ca --- /dev/null +++ b/src/declarative/util/qmltransitionmanager.cpp @@ -0,0 +1,282 @@ +/**************************************************************************** +** +** 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 "qmltransitionmanager_p_p.h" + +#include "qmlstate_p_p.h" + +#include <qmlbinding.h> +#include <qmlglobal_p.h> + +QT_BEGIN_NAMESPACE + +DEFINE_BOOL_CONFIG_OPTION(stateChangeDebug, STATECHANGE_DEBUG); + +class QmlTransitionManagerPrivate +{ +public: + QmlTransitionManagerPrivate() + : state(0), transition(0) {} + + void applyBindings(); + typedef QList<QmlSimpleAction> SimpleActionList; + QmlState *state; + QmlTransition *transition; + QmlStateOperation::ActionList bindingsList; + SimpleActionList completeList; +}; + +QmlTransitionManager::QmlTransitionManager() +: d(new QmlTransitionManagerPrivate) +{ +} + +void QmlTransitionManager::setState(QmlState *s) +{ + d->state = s; +} + +QmlTransitionManager::~QmlTransitionManager() +{ + delete d; d = 0; +} + +void QmlTransitionManager::complete() +{ + d->applyBindings(); + + for (int ii = 0; ii < d->completeList.count(); ++ii) { + const QmlMetaProperty &prop = d->completeList.at(ii).property; + prop.write(d->completeList.at(ii).value); + } + + d->completeList.clear(); + + if (d->state) + static_cast<QmlStatePrivate*>(QObjectPrivate::get(d->state))->complete(); +} + +void QmlTransitionManagerPrivate::applyBindings() +{ + foreach(const QmlAction &action, bindingsList) { + if (action.toBinding) { + action.property.setBinding(action.toBinding); + } else if (action.event) { + if (action.reverseEvent) + action.event->reverse(); + else + action.event->execute(); + } + + } + + bindingsList.clear(); +} + +void QmlTransitionManager::transition(const QList<QmlAction> &list, + QmlTransition *transition) +{ + cancel(); + + QmlStateOperation::ActionList applyList = list; + // Determine which actions are binding changes. + foreach(const QmlAction &action, applyList) { + if (action.toBinding) + d->bindingsList << action; + if (action.fromBinding) + action.property.setBinding(0); // Disable current binding + if (action.event && action.event->changesBindings()) { //### assume isReversable()? + d->bindingsList << action; + if (action.reverseEvent) + action.event->clearReverseBindings(); + else + action.event->clearForwardBindings(); + } + } + + // Animated transitions need both the start and the end value for + // each property change. In the presence of bindings, the end values + // are non-trivial to calculate. As a "best effort" attempt, we first + // apply all the property and binding changes, then read all the actual + // final values, then roll back the changes and proceed as normal. + // + // This doesn't catch everything, and it might be a little fragile in + // some cases - but whatcha going to do? + + if (!d->bindingsList.isEmpty()) { + + //### do extra actions here? + + // Apply all the property and binding changes + for (int ii = 0; ii < applyList.size(); ++ii) { + const QmlAction &action = applyList.at(ii); + if (action.toBinding) { + action.property.setBinding(action.toBinding, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding); + } else if (!action.event) { + action.property.write(action.toValue, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding); + } else if (action.event->isReversable()) { + if (action.reverseEvent) + action.event->reverse(); + else + action.event->execute(); + applyList << action.event->extraActions(); + } + } + + // Read all the end values for binding changes + for (int ii = 0; ii < applyList.size(); ++ii) { + QmlAction *action = &applyList[ii]; + if (action->event) + continue; + const QmlMetaProperty &prop = action->property; + if (action->toBinding || !action->toValue.isValid()) { //### is this always right (used for exta actions) + action->toValue = prop.read(); + } + } + + // Revert back to the original values + foreach(const QmlAction &action, applyList) { + if (action.event) { + if (action.event->isReversable()) { + if (action.reverseEvent) { //reverse the reverse + action.event->clearForwardBindings(); + action.event->rewind(); + action.event->clearReverseBindings(); + } else { + action.event->clearReverseBindings(); + action.event->rewind(); + action.event->clearForwardBindings(); + } + } + continue; + } + + if (action.toBinding) + action.property.setBinding(0); // Make sure this is disabled during the transition + + action.property.write(action.fromValue, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding); + } + } + + if (transition) { + QList<QmlMetaProperty> touched; + d->transition = transition; + d->transition->prepare(applyList, touched, this); + + // Modify the action list to remove actions handled in the transition + for (int ii = 0; ii < applyList.count(); ++ii) { + const QmlAction &action = applyList.at(ii); + + if (action.event) { + + if (action.actionDone) { + applyList.removeAt(ii); + --ii; + } + + } else { + + if (touched.contains(action.property)) { + if (action.toValue != action.fromValue) + d->completeList << + QmlSimpleAction(action, QmlSimpleAction::EndState); + + applyList.removeAt(ii); + --ii; + } + + } + } + } + + // Any actions remaining have not been handled by the transition and should + // be applied immediately. We skip applying bindings, as they are all + // applied at the end in applyBindings() to avoid any nastiness mid + // transition + foreach(const QmlAction &action, applyList) { + if (action.event && !action.event->changesBindings()) { + if (action.event->isReversable() && action.reverseEvent) + action.event->reverse(); + else + action.event->execute(); + } else if (!action.event && !action.toBinding) { + action.property.write(action.toValue); + } + } + if (stateChangeDebug()) { + foreach(const QmlAction &action, applyList) { + if (action.event) + qWarning() << " No transition for event:" << action.event->typeName(); + else + qWarning() << " No transition for:" << action.property.object() + << action.property.name() << "From:" << action.fromValue + << "To:" << action.toValue; + } + } + if (!transition) + d->applyBindings(); +} + +void QmlTransitionManager::cancel() +{ + if (d->transition) { + // ### this could potentially trigger a complete in rare circumstances + d->transition->stop(); + d->transition = 0; + } + + for(int i = 0; i < d->bindingsList.count(); ++i) { + QmlAction action = d->bindingsList[i]; + if (action.toBinding && action.deletableToBinding) { + action.property.setBinding(0); + action.toBinding->destroy(); + action.toBinding = 0; + action.deletableToBinding = false; + } else if (action.event) { + //### what do we do here? + } + + } + d->bindingsList.clear(); + d->completeList.clear(); +} + +QT_END_NAMESPACE |