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/****************************************************************************
**
** Copyright (C) 2010 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 "qmlgraphicsflipable_p.h"
#include "qmlgraphicsitem_p.h"
#include <qmlinfo.h>
#include <QtGui/qgraphicstransform.h>
QT_BEGIN_NAMESPACE
class QmlGraphicsFlipablePrivate : public QmlGraphicsItemPrivate
{
Q_DECLARE_PUBLIC(QmlGraphicsFlipable)
public:
QmlGraphicsFlipablePrivate() : current(QmlGraphicsFlipable::Front), front(0), back(0) {}
void updateSceneTransformFromParent();
QmlGraphicsFlipable::Side current;
QmlGraphicsItem *front;
QmlGraphicsItem *back;
};
/*!
\qmlclass Flipable QmlGraphicsFlipable
\since 4.7
\brief The Flipable item provides a surface that can be flipped.
\inherits Item
Flipable allows you to specify a front and a back and then flip between those sides.
Here's an example that flips between the front and back sides when clicked:
\qml
Flipable {
id: flipable
width: 250; height: 250
property int angle: 0
transform: Rotation {
id: rotation
origin.x: flipable.width/2; origin.y: flipable.height/2
axis.x: 0; axis.y: 1; axis.z: 0 // rotate around y-axis
angle: flipable.angle
}
front: Image { source: "front.png" }
back: Image { source: "back.png" }
states: State {
name: "back"
PropertyChanges { target: flipable; angle: 180 }
}
transitions: Transition {
NumberAnimation { properties: "angle"; duration: 2000 }
}
MouseArea {
// change between default and 'back' states
onClicked: flipable.state = (flipable.state == 'back' ? '' : 'back')
anchors.fill: parent
}
}
\endqml
\image flipable.gif
*/
/*!
\internal
\class QmlGraphicsFlipable
\brief The QmlGraphicsFlipable class provides a flipable surface.
\ingroup group_widgets
QmlGraphicsFlipable allows you to specify a front and a back, as well as an
axis for the flip.
*/
QmlGraphicsFlipable::QmlGraphicsFlipable(QmlGraphicsItem *parent)
: QmlGraphicsItem(*(new QmlGraphicsFlipablePrivate), parent)
{
}
QmlGraphicsFlipable::~QmlGraphicsFlipable()
{
}
/*!
\qmlproperty Item Flipable::front
\qmlproperty Item Flipable::back
The front and back sides of the flipable.
*/
QmlGraphicsItem *QmlGraphicsFlipable::front()
{
Q_D(const QmlGraphicsFlipable);
return d->front;
}
void QmlGraphicsFlipable::setFront(QmlGraphicsItem *front)
{
Q_D(QmlGraphicsFlipable);
if (d->front) {
qmlInfo(this) << tr("front is a write-once property");
return;
}
d->front = front;
d->front->setParentItem(this);
if (Back == d->current)
d->front->setOpacity(0.);
}
QmlGraphicsItem *QmlGraphicsFlipable::back()
{
Q_D(const QmlGraphicsFlipable);
return d->back;
}
void QmlGraphicsFlipable::setBack(QmlGraphicsItem *back)
{
Q_D(QmlGraphicsFlipable);
if (d->back) {
qmlInfo(this) << tr("back is a write-once property");
return;
}
d->back = back;
d->back->setParentItem(this);
if (Front == d->current)
d->back->setOpacity(0.);
}
/*!
\qmlproperty enumeration Flipable::side
The side of the Flippable currently visible. Possible values are \c
Front and \c Back.
*/
QmlGraphicsFlipable::Side QmlGraphicsFlipable::side() const
{
Q_D(const QmlGraphicsFlipable);
if (d->dirtySceneTransform)
const_cast<QmlGraphicsFlipablePrivate *>(d)->updateSceneTransformFromParent();
return d->current;
}
// determination on the currently visible side of the flipable
// has to be done on the complete scene transform to give
// correct results.
void QmlGraphicsFlipablePrivate::updateSceneTransformFromParent()
{
Q_Q(QmlGraphicsFlipable);
QmlGraphicsItemPrivate::updateSceneTransformFromParent();
QPointF p1(0, 0);
QPointF p2(1, 0);
QPointF p3(1, 1);
p1 = sceneTransform.map(p1);
p2 = sceneTransform.map(p2);
p3 = sceneTransform.map(p3);
qreal cross = (p1.x() - p2.x()) * (p3.y() - p2.y()) -
(p1.y() - p2.y()) * (p3.x() - p2.x());
QmlGraphicsFlipable::Side newSide;
if (cross > 0) {
newSide = QmlGraphicsFlipable::Back;
} else {
newSide = QmlGraphicsFlipable::Front;
}
if (newSide != current) {
current = newSide;
if (current == QmlGraphicsFlipable::Back) {
QTransform mat;
mat.translate(back->width()/2,back->height()/2);
if (back->width() && p1.x() >= p2.x())
mat.rotate(180, Qt::YAxis);
if (back->height() && p2.y() >= p3.y())
mat.rotate(180, Qt::XAxis);
mat.translate(-back->width()/2,-back->height()/2);
back->setTransform(mat);
}
if (front)
front->setOpacity((current==QmlGraphicsFlipable::Front)?1.:0.);
if (back)
back->setOpacity((current==QmlGraphicsFlipable::Back)?1.:0.);
emit q->sideChanged();
}
}
QT_END_NAMESPACE
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