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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 276 insertions, 0 deletions

diff --git a/src/declarative/util/qdeclarativetransitionmanager.cpp b/src/declarative/util/qdeclarativetransitionmanager.cpp
new file mode 100644
index 0000000000..b3196ee7a8
--- /dev/null
+++ b/src/declarative/util/qdeclarativetransitionmanager.cpp
@@ -0,0 +1,276 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 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/qdeclarativetransitionmanager_p_p.h"
+
+#include "private/qdeclarativestate_p_p.h"
+#include "private/qdeclarativestate_p.h"
+
+#include <qdeclarativebinding_p.h>
+#include <qdeclarativeglobal_p.h>
+#include <qdeclarativeproperty_p.h>
+
+QT_BEGIN_NAMESPACE
+
+DEFINE_BOOL_CONFIG_OPTION(stateChangeDebug, STATECHANGE_DEBUG);
+
+class QDeclarativeTransitionManagerPrivate
+{
+public:
+    QDeclarativeTransitionManagerPrivate()
+    : state(0), transition(0) {}
+
+    void applyBindings();
+    typedef QList<QDeclarativeSimpleAction> SimpleActionList;
+    QDeclarativeState *state;
+    QDeclarativeTransition *transition;
+    QDeclarativeStateOperation::ActionList bindingsList;
+    SimpleActionList completeList;
+};
+
+QDeclarativeTransitionManager::QDeclarativeTransitionManager()
+: d(new QDeclarativeTransitionManagerPrivate)
+{
+}
+
+void QDeclarativeTransitionManager::setState(QDeclarativeState *s)
+{
+    d->state = s;
+}
+
+QDeclarativeTransitionManager::~QDeclarativeTransitionManager()
+{
+    delete d; d = 0;
+}
+
+void QDeclarativeTransitionManager::complete() 
+{
+    d->applyBindings();
+
+    for (int ii = 0; ii < d->completeList.count(); ++ii) {
+        const QDeclarativeProperty &prop = d->completeList.at(ii).property();
+        prop.write(d->completeList.at(ii).value());
+    }
+
+    d->completeList.clear();
+
+    if (d->state) 
+        static_cast<QDeclarativeStatePrivate*>(QObjectPrivate::get(d->state))->complete();
+}
+
+void QDeclarativeTransitionManagerPrivate::applyBindings()
+{
+    foreach(const QDeclarativeAction &action, bindingsList) {
+        if (!action.toBinding.isNull()) {
+            QDeclarativePropertyPrivate::setBinding(action.property, action.toBinding.data());
+        } else if (action.event) {
+            if (action.reverseEvent)
+                action.event->reverse();
+            else
+                action.event->execute();
+        }
+
+    }
+
+    bindingsList.clear();
+}
+
+void QDeclarativeTransitionManager::transition(const QList<QDeclarativeAction> &list,
+                                      QDeclarativeTransition *transition)
+{
+    cancel();
+
+    QDeclarativeStateOperation::ActionList applyList = list;
+    // Determine which actions are binding changes.
+    foreach(const QDeclarativeAction &action, applyList) {
+        if (action.toBinding)
+            d->bindingsList << action;
+        if (action.fromBinding)
+            QDeclarativePropertyPrivate::setBinding(action.property, 0); // Disable current binding
+        if (action.event && action.event->changesBindings()) {  //### assume isReversable()?
+            d->bindingsList << action;
+            action.event->clearBindings();
+        }
+    }
+
+    // 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()) {
+
+        // Apply all the property and binding changes
+        for (int ii = 0; ii < applyList.size(); ++ii) {
+            const QDeclarativeAction &action = applyList.at(ii);
+            if (!action.toBinding.isNull()) {
+                QDeclarativePropertyPrivate::setBinding(action.property, action.toBinding.data(), QDeclarativePropertyPrivate::BypassInterceptor | QDeclarativePropertyPrivate::DontRemoveBinding);
+            } else if (!action.event) {
+                QDeclarativePropertyPrivate::write(action.property, action.toValue, QDeclarativePropertyPrivate::BypassInterceptor | QDeclarativePropertyPrivate::DontRemoveBinding);
+            } else if (action.event->isReversable()) {
+                if (action.reverseEvent)
+                    action.event->reverse(QDeclarativeActionEvent::FastForward);
+                else
+                    action.event->execute(QDeclarativeActionEvent::FastForward);
+            }
+        }
+
+        // Read all the end values for binding changes
+        for (int ii = 0; ii < applyList.size(); ++ii) {
+            QDeclarativeAction *action = &applyList[ii];
+            if (action->event) {
+                action->event->saveTargetValues();
+                continue;
+            }
+            const QDeclarativeProperty &prop = action->property;
+            if (!action->toBinding.isNull() || !action->toValue.isValid()) {
+                action->toValue = prop.read();
+            }
+        }
+
+        // Revert back to the original values
+        foreach(const QDeclarativeAction &action, applyList) {
+            if (action.event) {
+                if (action.event->isReversable()) {
+                    action.event->clearBindings();
+                    action.event->rewind();
+                    action.event->clearBindings();  //### shouldn't be needed
+                }
+                continue;
+            }
+
+            if (action.toBinding)
+                QDeclarativePropertyPrivate::setBinding(action.property, 0); // Make sure this is disabled during the transition
+
+            QDeclarativePropertyPrivate::write(action.property, action.fromValue, QDeclarativePropertyPrivate::BypassInterceptor | QDeclarativePropertyPrivate::DontRemoveBinding);
+        }
+    }
+
+    if (transition) {
+        QList<QDeclarativeProperty> 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 QDeclarativeAction &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 << 
+                            QDeclarativeSimpleAction(action, QDeclarativeSimpleAction::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 QDeclarativeAction &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);
+        }
+    }
+#ifndef QT_NO_DEBUG_STREAM
+    if (stateChangeDebug()) {
+        foreach(const QDeclarativeAction &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;
+        }
+    }
+#endif
+    if (!transition)
+        d->applyBindings();
+}
+
+void QDeclarativeTransitionManager::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) {
+        QDeclarativeAction action = d->bindingsList[i];
+        if (!action.toBinding.isNull() && action.deletableToBinding) {
+            QDeclarativePropertyPrivate::setBinding(action.property, 0);
+            action.toBinding.data()->destroy();
+            action.toBinding.clear();
+            action.deletableToBinding = false;
+        } else if (action.event) {
+            //### what do we do here?
+        }
+
+    }
+    d->bindingsList.clear();
+    d->completeList.clear();
+}
+
+QT_END_NAMESPACE