/****************************************************************************

**

** 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 "private/qdeclarativeitem_p.h"

#include "qdeclarativeitem.h"

#include "private/qdeclarativeevents_p_p.h"

#include <private/qdeclarativeengine_p.h>

#include <qdeclarativeengine.h>

#include <qdeclarativeopenmetaobject_p.h>

#include <qdeclarativestate_p.h>

#include <qdeclarativeview.h>

#include <qdeclarativestategroup_p.h>

#include <qdeclarativecomponent.h>

#include <qdeclarativeinfo.h>

#include <QDebug>

#include <QPen>

#include <QFile>

#include <QEvent>

#include <QGraphicsSceneMouseEvent>

#include <QtCore/qnumeric.h>

#include <QtScript/qscriptengine.h>

#include <QtGui/qgraphicstransform.h>

#include <qlistmodelinterface_p.h>

QT_BEGIN_NAMESPACE

#ifndef FLT_MAX

#define FLT_MAX 1E+37

#endif

/*!

    \qmlclass Transform QGraphicsTransform

    \since 4.7

    \brief The Transform elements provide a way of building advanced transformations on Items.

    The Transform element is a base type which cannot be instantiated directly.

    The following concrete Transform types are available:

    \list

    \o \l Rotation

    \o \l Scale

    \o \l Translate

    \endlist

    The Transform elements let you create and control advanced transformations that can be configured

    independently using specialized properties.

    You can assign any number of Transform elements to an Item. Each Transform is applied in order,

    one at a time, to the Item it's assigned to.

*/

/*!

    \qmlclass Translate QGraphicsTranslate

    \since 4.7

    \brief The Translate object provides a way to move an Item without changing its x or y properties.

    The Translate object provides independent control over position in addition to the Item's x and y properties.

    The following example moves the Y axis of the Rectangles while still allowing the Row element

    to lay the items out as if they had not been transformed:

    \qml

    Row {

        Rectangle {

            width: 100; height: 100

            color: "blue"

            transform: Translate { y: 20 }

        }

        Rectangle {

            width: 100; height: 100

            color: "red"

            transform: Translate { y: -20 }

        }

    }

    \endqml

*/

/*!

    \qmlproperty real Translate::x

    The translation along the X axis.

*/

/*!

    \qmlproperty real Translate::y

    The translation along the Y axis.

*/

/*!

    \qmlclass Scale QGraphicsScale

    \since 4.7

    \brief The Scale object provides a way to scale an Item.

    The Scale object gives more control over scaling than using Item's scale property. Specifically,

    it allows a different scale for the x and y axes, and allows the scale to be relative to an

    arbitrary point.

    The following example scales the X axis of the Rectangle, relative to its interior point 25, 25:

    \qml

    Rectangle {

        width: 100; height: 100

        color: "blue"

        transform: Scale { origin.x: 25; origin.y: 25; xScale: 3}

    }

    \endqml

*/

/*!

    \qmlproperty real Scale::origin.x

    \qmlproperty real Scale::origin.y

    The point that the item is scaled from (i.e., the point that stays fixed relative to the parent as

    the rest of the item grows). By default the origin is 0, 0.

*/

/*!

    \qmlproperty real Scale::xScale

    The scaling factor for the X axis.

*/

/*!

    \qmlproperty real Scale::yScale

    The scaling factor for the Y axis.

*/

/*!

    \qmlclass Rotation QGraphicsRotation

    \since 4.7

    \brief The Rotation object provides a way to rotate an Item.

    The Rotation object gives more control over rotation than using Item's rotation property.

    Specifically, it allows (z axis) rotation to be relative to an arbitrary point.

    The following example rotates a Rectangle around its interior point 25, 25:

    \qml

    Rectangle {

        width: 100; height: 100

        color: "blue"

        transform: Rotation { origin.x: 25; origin.y: 25; angle: 45}

    }

    \endqml

    Rotation also provides a way to specify 3D-like rotations for Items. For these types of

    rotations you must specify the axis to rotate around in addition to the origin point.

    The following example shows various 3D-like rotations applied to an \l Image.

    \snippet doc/src/snippets/declarative/rotation.qml 0

    \image axisrotation.png

*/

/*!

    \qmlproperty real Rotation::origin.x

    \qmlproperty real Rotation::origin.y

    The origin point of the rotation (i.e., the point that stays fixed relative to the parent as

    the rest of the item rotates). By default the origin is 0, 0.

*/

/*!

    \qmlproperty real Rotation::axis.x

    \qmlproperty real Rotation::axis.y

    \qmlproperty real Rotation::axis.z

    The axis to rotate around. For simple (2D) rotation around a point, you do not need to specify an axis,

    as the default axis is the z axis (\c{ axis { x: 0; y: 0; z: 1 } }).

    For a typical 3D-like rotation you will usually specify both the origin and the axis.

    \image 3d-rotation-axis.png

*/

/*!

    \qmlproperty real Rotation::angle

    The angle to rotate, in degrees clockwise.

*/

/*!

    \internal

    \class QDeclarativeContents

    \brief The QDeclarativeContents class gives access to the height and width of an item's contents.

*/

QDeclarativeContents::QDeclarativeContents() : m_x(0), m_y(0), m_width(0), m_height(0)

{

}

QDeclarativeContents::~QDeclarativeContents()

{

    QList<QGraphicsItem *> children = m_item->childItems();

    for (int i = 0; i < children.count(); ++i) {

        QDeclarativeItem *child = qobject_cast<QDeclarativeItem *>(children.at(i));

        if(!child)//### Should this be ignoring non-QDeclarativeItem graphicsobjects?

            continue;

        QDeclarativeItemPrivate::get(child)->removeItemChangeListener(this, QDeclarativeItemPrivate::Geometry | QDeclarativeItemPrivate::Destroyed);

    }

}

QRectF QDeclarativeContents::rectF() const

{

    return QRectF(m_x, m_y, m_width, m_height);

}

void QDeclarativeContents::calcHeight(QDeclarativeItem *changed)

{

    qreal oldy = m_y;

    qreal oldheight = m_height;

    if (changed) {

        qreal top = oldy;

        qreal bottom = oldy + oldheight;

        qreal y = changed->y();

        if (y + changed->height() > bottom)

            bottom = y + changed->height();

        if (y < top)

            top = y;

        m_y = top;

        m_height = bottom - top;

    } else {

        qreal top = FLT_MAX;

        qreal bottom = 0;

        QList<QGraphicsItem *> children = m_item->childItems();

        for (int i = 0; i < children.count(); ++i) {

            QDeclarativeItem *child = qobject_cast<QDeclarativeItem *>(children.at(i));

            if(!child)//### Should this be ignoring non-QDeclarativeItem graphicsobjects?

                continue;

            qreal y = child->y();

            if (y + child->height() > bottom)

                bottom = y + child->height();

            if (y < top)

                top = y;

        }

        if (!children.isEmpty())

            m_y = top;

        m_height = qMax(bottom - top, qreal(0.0));

    }

    if (m_height != oldheight || m_y != oldy)

        emit rectChanged(rectF());

}

void QDeclarativeContents::calcWidth(QDeclarativeItem *changed)

{

    qreal oldx = m_x;

    qreal oldwidth = m_width;

    if (changed) {

        qreal left = oldx;

        qreal right = oldx + oldwidth;

        qreal x = changed->x();

        if (x + changed->width() > right)

            right = x + changed->width();

        if (x < left)

            left = x;

        m_x = left;

        m_width = right - left;

    } else {

        qreal left = FLT_MAX;

        qreal right = 0;

        QList<QGraphicsItem *> children = m_item->childItems();

        for (int i = 0; i < children.count(); ++i) {

            QDeclarativeItem *child = qobject_cast<QDeclarativeItem *>(children.at(i));

            if(!child)//### Should this be ignoring non-QDeclarativeItem graphicsobjects?

                continue;

            qreal x = child->x();

            if (x + child->width() > right)

                right = x + child->width();

            if (x < left)

                left = x;

        }

        if (!children.isEmpty())

            m_x = left;

        m_width = qMax(right - left, qreal(0.0));

    }

    if (m_width != oldwidth || m_x != oldx)

        emit rectChanged(rectF());

}

void QDeclarativeContents::setItem(QDeclarativeItem *item)

{

    m_item = item;

    //### optimize

    connect(this, SIGNAL(rectChanged(QRectF)), m_item, SIGNAL(childrenRectChanged(QRectF)));

    QList<QGraphicsItem *> children = m_item->childItems();

    for (int i = 0; i < children.count(); ++i) {

        QDeclarativeItem *child = qobject_cast<QDeclarativeItem *>(children.at(i));

        if(!child)//### Should this be ignoring non-QDeclarativeItem graphicsobjects?

            continue;

        QDeclarativeItemPrivate::get(child)->addItemChangeListener(this, QDeclarativeItemPrivate::Geometry | QDeclarativeItemPrivate::Destroyed);

        //###what about changes to visibility?

    }

    //### defer until componentComplete

    calcHeight();

    calcWidth();

}

void QDeclarativeContents::itemGeometryChanged(QDeclarativeItem *changed, const QRectF &newGeometry, const QRectF &oldGeometry)

{

    if (newGeometry.width() != oldGeometry.width())

        calcWidth(changed);

    if (newGeometry.height() != oldGeometry.height())

        calcHeight(changed);

}

void QDeclarativeContents::itemDestroyed(QDeclarativeItem *item)

{

    if (item)

        QDeclarativeItemPrivate::get(item)->removeItemChangeListener(this, QDeclarativeItemPrivate::Geometry | QDeclarativeItemPrivate::Destroyed);

    calcWidth();

    calcHeight();

}

void QDeclarativeContents::childRemoved(QDeclarativeItem *item)

{

    if (item)

        QDeclarativeItemPrivate::get(item)->removeItemChangeListener(this, QDeclarativeItemPrivate::Geometry | QDeclarativeItemPrivate::Destroyed);

    calcWidth();

    calcHeight();

}

void QDeclarativeContents::childAdded(QDeclarativeItem *item)

{

    if (item)

        QDeclarativeItemPrivate::get(item)->addItemChangeListener(this, QDeclarativeItemPrivate::Geometry | QDeclarativeItemPrivate::Destroyed);

    calcWidth(item);

    calcHeight(item);

}

QDeclarativeItemKeyFilter::QDeclarativeItemKeyFilter(QDeclarativeItem *item)

: m_processPost(false), m_next(0)

{

    QDeclarativeItemPrivate *p =

        item?static_cast<QDeclarativeItemPrivate *>(QGraphicsItemPrivate::get(item)):0;

    if (p) {

        m_next = p->keyHandler;

        p->keyHandler = this;

    }

}

QDeclarativeItemKeyFilter::~QDeclarativeItemKeyFilter()

{

}

void QDeclarativeItemKeyFilter::keyPressed(QKeyEvent *event, bool post)

{

    if (m_next) m_next->keyPressed(event, post);

}

void QDeclarativeItemKeyFilter::keyReleased(QKeyEvent *event, bool post)

{

    if (m_next) m_next->keyReleased(event, post);

}

void QDeclarativeItemKeyFilter::inputMethodEvent(QInputMethodEvent *event, bool post)

{

    if (m_next) m_next->inputMethodEvent(event, post);

}

QVariant QDeclarativeItemKeyFilter::inputMethodQuery(Qt::InputMethodQuery query) const

{

    if (m_next) return m_next->inputMethodQuery(query);

    return QVariant();

}

void QDeclarativeItemKeyFilter::componentComplete()

{

    if (m_next) m_next->componentComplete();

}

/*!

    \qmlclass KeyNavigation

    \since 4.7

    \brief The KeyNavigation attached property supports key navigation by arrow keys.

    It is common in key-based UIs to use arrow keys to navigate

    between focussed items.  The KeyNavigation property provides a

    convenient way of specifying which item will gain focus

    when an arrow key is pressed.  The following example provides

    key navigation for a 2x2 grid of items.

    \code

    Grid {

        columns: 2

        width: 100; height: 100

        Rectangle {

            id: item1

            focus: true

            width: 50; height: 50

            color: focus ? "red" : "lightgray"

            KeyNavigation.right: item2

            KeyNavigation.down: item3

        }

        Rectangle {

            id: item2

            width: 50; height: 50

            color: focus ? "red" : "lightgray"

            KeyNavigation.left: item1

            KeyNavigation.down: item4

        }

        Rectangle {

            id: item3

            width: 50; height: 50

            color: focus ? "red" : "lightgray"

            KeyNavigation.right: item4

            KeyNavigation.up: item1

        }

        Rectangle {

            id: item4

            width: 50; height: 50

            color: focus ? "red" : "lightgray"

            KeyNavigation.left: item3

            KeyNavigation.up: item2

        }

    }

    \endcode

    By default KeyNavigation receives key events after the item it is attached to.

    If the item accepts an arrow key event, the KeyNavigation

    attached property will not receive an event for that key.  Setting the

    \l priority property to KeyNavigation.BeforeItem allows handling

    of the key events before normal item processing.

    If an item has been set for a direction and the KeyNavigation

    attached property receives the corresponding

    key press and release events, the events will be accepted by

    KeyNavigation and will not propagate any further.

    \sa {Keys}{Keys attached property}

*/

/*!

    \qmlproperty Item KeyNavigation::left

    \qmlproperty Item KeyNavigation::right

    \qmlproperty Item KeyNavigation::up

    \qmlproperty Item KeyNavigation::down

    These properties hold the item to assign focus to

    when Key_Left, Key_Right, Key_Up or Key_Down are

    pressed.

*/

QDeclarativeKeyNavigationAttached::QDeclarativeKeyNavigationAttached(QObject *parent)

: QObject(*(new QDeclarativeKeyNavigationAttachedPrivate), parent),

  QDeclarativeItemKeyFilter(qobject_cast<QDeclarativeItem*>(parent))

{

    m_processPost = true;

}

QDeclarativeKeyNavigationAttached *

QDeclarativeKeyNavigationAttached::qmlAttachedProperties(QObject *obj)

{

    return new QDeclarativeKeyNavigationAttached(obj);

}

QDeclarativeItem *QDeclarativeKeyNavigationAttached::left() const

{

    Q_D(const QDeclarativeKeyNavigationAttached);

    return d->left;

}

void QDeclarativeKeyNavigationAttached::setLeft(QDeclarativeItem *i)

{

    Q_D(QDeclarativeKeyNavigationAttached);

    d->left = i;

    emit changed();

}

QDeclarativeItem *QDeclarativeKeyNavigationAttached::right() const

{

    Q_D(const QDeclarativeKeyNavigationAttached);

    return d->right;

}

void QDeclarativeKeyNavigationAttached::setRight(QDeclarativeItem *i)

{

    Q_D(QDeclarativeKeyNavigationAttached);

    d->right = i;

    emit changed();

}