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Diffstat (limited to 'src/quick/util/qquicktransition.cpp')
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1 files changed, 412 insertions, 0 deletions
diff --git a/src/quick/util/qquicktransition.cpp b/src/quick/util/qquicktransition.cpp new file mode 100644 index 0000000000..5d9a2880d2 --- /dev/null +++ b/src/quick/util/qquicktransition.cpp @@ -0,0 +1,412 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the QtQml module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** 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. +** +** 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. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qquicktransition_p.h" + +#include "qquickstate_p.h" +#include "qquickstate_p_p.h" +#include "qquickstatechangescript_p.h" +#include "qquickanimation_p.h" +#include "qquickanimation_p_p.h" +#include "qquicktransitionmanager_p_p.h" + +#include "private/qparallelanimationgroupjob_p.h" + +QT_BEGIN_NAMESPACE + +/*! + \qmlclass Transition QQuickTransition + \inqmlmodule QtQuick 2 + \ingroup qml-animation-transition + \brief The Transition element defines animated transitions that occur on state changes. + + A Transition defines the animations to be applied when a \l State change occurs. + + For example, the following \l Rectangle has two states: the default state, and + an added "moved" state. In the "moved state, the rectangle's position changes + to (50, 50). The added Transition specifies that when the rectangle + changes between the default and the "moved" state, any changes + to the \c x and \c y properties should be animated, using an \c Easing.InOutQuad. + + \snippet doc/src/snippets/qml/transition.qml 0 + + Notice the example does not require \l{PropertyAnimation::}{to} and + \l{PropertyAnimation::}{from} values for the NumberAnimation. As a convenience, + these properties are automatically set to the values of \c x and \c y before + and after the state change; the \c from values are provided by + the current values of \c x and \c y, and the \c to values are provided by + the PropertyChanges object. If you wish, you can provide \l{PropertyAnimation::}{to} and + \l{PropertyAnimation::}{from} values anyway to override the default values. + + By default, a Transition's animations are applied for any state change in the + parent item. The Transition \l {Transition::}{from} and \l {Transition::}{to} + values can be set to restrict the animations to only be applied when changing + from one particular state to another. + + To define multiple transitions, specify \l Item::transitions as a list: + + \snippet doc/src/snippets/qml/transitions-list.qml list of transitions + + If multiple Transitions are specified, only a single (best-matching) Transition will be applied for any particular + state change. In the example above, when changing to \c state1, the first transition will be used, rather + than the more generic second transition. + + If a state change has a Transition that matches the same property as a + \l Behavior, the Transition animation overrides the \l Behavior for that + state change. + + \sa {QML Animation and Transitions}, {declarative/animation/states}{states example}, {qmlstates}{States}, {QtQml} +*/ + +QQuickTransitionInstance::QQuickTransitionInstance() + : m_anim(0) +{ +} + +QQuickTransitionInstance::~QQuickTransitionInstance() +{ + delete m_anim; +} + +void QQuickTransitionInstance::start() +{ + if (m_anim) + m_anim->start(); +} + +void QQuickTransitionInstance::stop() +{ + if (m_anim) + m_anim->stop(); +} + +bool QQuickTransitionInstance::isRunning() const +{ + return m_anim && m_anim->state() == QAbstractAnimationJob::Running; +} + + +//ParallelAnimationWrapper allows us to do a "callback" when the animation finishes, rather than connecting +//and disconnecting signals and slots frequently +class ParallelAnimationWrapper : public QParallelAnimationGroupJob +{ +public: + ParallelAnimationWrapper() : QParallelAnimationGroupJob() {} + QQuickTransitionManager *manager; + +protected: + virtual void updateState(QAbstractAnimationJob::State newState, QAbstractAnimationJob::State oldState); +}; + +class QQuickTransitionPrivate : public QObjectPrivate +{ + Q_DECLARE_PUBLIC(QQuickTransition) +public: + QQuickTransitionPrivate() + : fromState(QLatin1String("*")), toState(QLatin1String("*")), + reversed(false), reversible(false), enabled(true) + { + } + + QString fromState; + QString toState; + bool reversed; + bool reversible; + bool enabled; + + static void append_animation(QQmlListProperty<QQuickAbstractAnimation> *list, QQuickAbstractAnimation *a); + static int animation_count(QQmlListProperty<QQuickAbstractAnimation> *list); + static QQuickAbstractAnimation* animation_at(QQmlListProperty<QQuickAbstractAnimation> *list, int pos); + static void clear_animations(QQmlListProperty<QQuickAbstractAnimation> *list); + QList<QQuickAbstractAnimation *> animations; +}; + +void QQuickTransitionPrivate::append_animation(QQmlListProperty<QQuickAbstractAnimation> *list, QQuickAbstractAnimation *a) +{ + QQuickTransition *q = static_cast<QQuickTransition *>(list->object); + q->d_func()->animations.append(a); + a->setDisableUserControl(); +} + +int QQuickTransitionPrivate::animation_count(QQmlListProperty<QQuickAbstractAnimation> *list) +{ + QQuickTransition *q = static_cast<QQuickTransition *>(list->object); + return q->d_func()->animations.count(); +} + +QQuickAbstractAnimation* QQuickTransitionPrivate::animation_at(QQmlListProperty<QQuickAbstractAnimation> *list, int pos) +{ + QQuickTransition *q = static_cast<QQuickTransition *>(list->object); + return q->d_func()->animations.at(pos); +} + +void QQuickTransitionPrivate::clear_animations(QQmlListProperty<QQuickAbstractAnimation> *list) +{ + QQuickTransition *q = static_cast<QQuickTransition *>(list->object); + while (q->d_func()->animations.count()) { + QQuickAbstractAnimation *firstAnim = q->d_func()->animations.at(0); + q->d_func()->animations.removeAll(firstAnim); + } +} + +void ParallelAnimationWrapper::updateState(QAbstractAnimationJob::State newState, QAbstractAnimationJob::State oldState) +{ + QParallelAnimationGroupJob::updateState(newState, oldState); + if (newState == Stopped && (duration() == -1 + || (direction() == QAbstractAnimationJob::Forward && currentLoopTime() == duration()) + || (direction() == QAbstractAnimationJob::Backward && currentLoopTime() == 0))) + { + manager->complete(); + } +} + + +QQuickTransition::QQuickTransition(QObject *parent) + : QObject(*(new QQuickTransitionPrivate), parent) +{ +} + +QQuickTransition::~QQuickTransition() +{ +} + +void QQuickTransition::setReversed(bool r) +{ + Q_D(QQuickTransition); + d->reversed = r; +} + +QQuickTransitionInstance *QQuickTransition::prepare(QQuickStateOperation::ActionList &actions, + QList<QQmlProperty> &after, + QQuickTransitionManager *manager, + QObject *defaultTarget) +{ + Q_D(QQuickTransition); + + qmlExecuteDeferred(this); + + ParallelAnimationWrapper *group = new ParallelAnimationWrapper(); + group->manager = manager; + + QQuickAbstractAnimation::TransitionDirection direction = d->reversed ? QQuickAbstractAnimation::Backward : QQuickAbstractAnimation::Forward; + int start = d->reversed ? d->animations.count() - 1 : 0; + int end = d->reversed ? -1 : d->animations.count(); + + QAbstractAnimationJob *anim = 0; + for (int i = start; i != end;) { + anim = d->animations.at(i)->transition(actions, after, direction, defaultTarget); + if (anim) + d->reversed ? group->prependAnimation(anim) : group->appendAnimation(anim); + d->reversed ? --i : ++i; + } + + group->setDirection(d->reversed ? QAbstractAnimationJob::Backward : QAbstractAnimationJob::Forward); + + QQuickTransitionInstance *wrapper = new QQuickTransitionInstance; + wrapper->m_anim = group; + return wrapper; +} + +/*! + \qmlproperty string QtQuick2::Transition::from + \qmlproperty string QtQuick2::Transition::to + + These properties indicate the state changes that trigger the transition. + + The default values for these properties is "*" (that is, any state). + + For example, the following transition has not set the \c to and \c from + properties, so the animation is always applied when changing between + the two states (i.e. when the mouse is pressed and released). + + \snippet doc/src/snippets/qml/transition-from-to.qml 0 + + If the transition was changed to this: + + \snippet doc/src/snippets/qml/transition-from-to-modified.qml modified transition + + The animation would only be applied when changing from the default state to + the "brighter" state (i.e. when the mouse is pressed, but not on release). + + Multiple \c to and \from values can be set by using a comma-separated string. + + \sa reversible +*/ +QString QQuickTransition::fromState() const +{ + Q_D(const QQuickTransition); + return d->fromState; +} + +void QQuickTransition::setFromState(const QString &f) +{ + Q_D(QQuickTransition); + if (f == d->fromState) + return; + + d->fromState = f; + emit fromChanged(); +} + +/*! + \qmlproperty bool QtQuick2::Transition::reversible + This property holds whether the transition should be automatically reversed when the conditions that triggered this transition are reversed. + + The default value is false. + + By default, transitions run in parallel and are applied to all state + changes if the \l from and \l to states have not been set. In this + situation, the transition is automatically applied when a state change + is reversed, and it is not necessary to set this property to reverse + the transition. + + However, if a SequentialAnimation is used, or if the \l from or \l to + properties have been set, this property will need to be set to reverse + a transition when a state change is reverted. For example, the following + transition applies a sequential animation when the mouse is pressed, + and reverses the sequence of the animation when the mouse is released: + + \snippet doc/src/snippets/qml/transition-reversible.qml 0 + + If the transition did not set the \c to and \c reversible values, then + on the mouse release, the transition would play the PropertyAnimation + before the ColorAnimation instead of reversing the sequence. +*/ +bool QQuickTransition::reversible() const +{ + Q_D(const QQuickTransition); + return d->reversible; +} + +void QQuickTransition::setReversible(bool r) +{ + Q_D(QQuickTransition); + if (r == d->reversible) + return; + + d->reversible = r; + emit reversibleChanged(); +} + +QString QQuickTransition::toState() const +{ + Q_D(const QQuickTransition); + return d->toState; +} + +void QQuickTransition::setToState(const QString &t) +{ + Q_D(QQuickTransition); + if (t == d->toState) + return; + + d->toState = t; + emit toChanged(); +} + +/*! + \qmlproperty bool QtQuick2::Transition::enabled + + This property holds whether the Transition will be run when moving + from the \c from state to the \c to state. + + By default a Transition is enabled. + + Note that in some circumstances disabling a Transition may cause an + alternative Transition to be used in its place. In the following + example, the generic Transition will be used to animate the change + from \c state1 to \c state2, as the more specific Transition has + been disabled. + + \qml + Item { + states: [ + State { name: "state1" ... } + State { name: "state2" ... } + ] + transitions: [ + Transition { from: "state1"; to: "state2"; enabled: false ... } + Transition { ... } + ] + } + \endqml +*/ + +bool QQuickTransition::enabled() const +{ + Q_D(const QQuickTransition); + return d->enabled; +} + +void QQuickTransition::setEnabled(bool enabled) +{ + Q_D(QQuickTransition); + if (d->enabled == enabled) + return; + d->enabled = enabled; + emit enabledChanged(); +} + +/*! + \qmlproperty list<Animation> QtQuick2::Transition::animations + \default + + This property holds a list of the animations to be run for this transition. + + \snippet examples/declarative/toys/dynamicscene/dynamicscene.qml top-level transitions + + The top-level animations are run in parallel. To run them sequentially, + define them within a SequentialAnimation: + + \snippet doc/src/snippets/qml/transition-reversible.qml sequential animations +*/ +QQmlListProperty<QQuickAbstractAnimation> QQuickTransition::animations() +{ + Q_D(QQuickTransition); + return QQmlListProperty<QQuickAbstractAnimation>(this, &d->animations, QQuickTransitionPrivate::append_animation, + QQuickTransitionPrivate::animation_count, + QQuickTransitionPrivate::animation_at, + QQuickTransitionPrivate::clear_animations); +} + +QT_END_NAMESPACE + +//#include <qquicktransition.moc> |