path: root/src/declarative/fx/qfxitem.cpp

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#include <QDebug>
#include <QPen>
#include <QFile>
#include <QEvent>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QGraphicsSceneMouseEvent>
#include <QtScript/qscriptengine.h>
#include <qfxperf.h>

#include "qmlengine.h"
#include "qmlstate.h"
#include "qlistmodelinterface.h"

#include "qfxtransform.h"
#include "qfxscalegrid.h"
#include "qfxview.h"
#include "qmlstategroup.h"

#include "qfxitem_p.h"
#include "qfxitem.h"
#include <qsimplecanvasfilter.h>
#include <qmlcomponent.h>


QT_BEGIN_NAMESPACE
#ifndef INT_MAX
#define INT_MAX 2147483647
#endif

QML_DEFINE_NOCREATE_TYPE(QFxContents);
QML_DEFINE_TYPE(QFxItem,Item);
QML_DEFINE_NOCREATE_TYPE(QSimpleCanvasFilter);

/*!
    \group group_animation
    \title Animation
*/

/*!
    \group group_coreitems
    \title Basic Items
*/

/*!
    \group group_effects
    \title Effects
*/

/*!
    \group group_layouts
    \title Layouts
*/

/*!
    \group group_states
    \title States and Transitions
*/

/*!
    \group group_utility
    \title Utility
*/

/*!
    \group group_views
    \title Views
*/

/*!
    \group group_widgets
    \title Widgets
*/

/*!
    \internal
    \class QFxContents
    \ingroup group_utility
    \brief The QFxContents class gives access to the height and width of an item's contents.

*/

QFxContents::QFxContents() : _height(0), _width(0)
{
}

/*!
    \property QFxContents::height
    \brief The height of the contents.
*/
int QFxContents::height() const
{
    return _height;
}

/*!
    \property QFxContents::width
    \brief The width of the contents.
*/
int QFxContents::width() const
{
    return _width;
}

//TODO: optimization: only check sender(), if there is one
void QFxContents::calcHeight()
{
    int oldheight = _height;

    int top = INT_MAX;
    int bottom = 0;
    foreach(const QSimpleCanvasItem *child, 
            _item->QSimpleCanvasItem::children()) {
        if (child->y() + child->height() > bottom)
            bottom = (int)child->y() + child->height();
        if (child->y() < top)
            top = (int)child->y();
    }
    _height = bottom - top;

    if (_height != oldheight)
        emit heightChanged();
}

//TODO: optimization: only check sender(), if there is one
void QFxContents::calcWidth()
{
    int oldwidth = _width;

    int left = INT_MAX;
    int right = 0;
    foreach(const QSimpleCanvasItem *child, 
            _item->QSimpleCanvasItem::children()) {
        if (child->x() + child->width() > right)
            right = (int)child->x() + child->width();
        if (child->x() < left)
            left = (int)child->x();
    }
    _width = right - left;

    if (_width != oldwidth)
        emit widthChanged();
}

void QFxContents::setItem(QFxItem *item)
{
    _item = item;

    foreach(const QSimpleCanvasItem *child, 
            _item->QSimpleCanvasItem::children()) {
        connect(child, SIGNAL(bottomChanged()), this, SLOT(calcHeight()));
        connect(child, SIGNAL(rightChanged()), this, SLOT(calcWidth()));
    }

    calcHeight();
    calcWidth();
}

/*!
    \qmlclass Item QFxItem
    \brief The Item element is the most basic of all visual canvas members.
 */

/*!
    \class QFxItem Item
    \brief The QFxItem class is a generic QFxView item. It is the base class for all other view items.

    \qmltext
    All visual elements in Qt Declarative inherit from QFxItem.  Although QFxItem
    has no visual appearance, it defines all the properties that are
    common across visual elements - like the x and y position, and the
    width and height.

    QFxItem is also useful for grouping elements together.

    \qml
    <Item>
        <Image file="tile.png" />
        <Image x="80" width="100" height="100" file="tile.png" />
        <Image x="190" width="100" height="100" tile="true" file="tile.png" />
    </Item>
    \endqml
    \endqmltext
    
    \ingroup group_coreitems
*/

/*!
    \fn void QFxItem::activeFocusChanged()

    This signal is emitted when this item gains active focus.
*/

/*!
    \fn void QFxItem::baselineChanged()

    This signal is emitted when the baseline of the item changes. 

    The baseline may change in response to a call to setBaselineOffset()
    or due to the geometry of the item changing.

    \sa baselineOffset(), setBaselineOffset()
*/

/*!
    \fn void QFxItem::baselineOffsetChanged()

    This signal is emitted when the baseline of the item is changed
    via setBaselineOffset(). 

    The baseline corresponds to the baseline of the text contained in
    the element.  It is useful for aligning the text in items placed
    beside each other.  The default baseline is positioned at
    2/3 of the height of the item.

    \sa baselineOffset(), setBaselineOffset()
*/

/*!
    \fn void QFxItem::leftChanged()

    This signal is emitted when the left coordinate of the item changes.
*/

/*!
    \fn void QFxItem::rightChanged()

    This signal is emitted when the right coordinate of the item changes.
*/

/*!
    \fn void QFxItem::topChanged()

    This signal is emitted when the top coordinate of the item changes.
*/

/*!
    \fn void QFxItem::bottomChanged()

    This signal is emitted when the bottom coordinate of the item changes.
*/

/*!
    \fn void QFxItem::widthChanged()

    This signal is emitted when the width of the item changes.
*/

/*!
    \fn void QFxItem::heightChanged()

    This signal is emitted when the height of the item changes.
*/

/*!
    \fn void QFxItem::hcenterChanged()

    This signal is emitted when the horizontal center coordinate of the item changes.
*/

/*!
    \fn void QFxItem::vcenterChanged()

    This signal is emitted when the vertical center coordinate of the item changes.
*/

/*!
    \fn void QFxItem::scaleChanged()

    This signal is emitted when the scale of the item changes.
*/

/*!
    \fn void QFxItem::stateChanged(const QString &state)

    This signal is emitted when the \a state of the item changes.

    \sa states-transitions
*/

/*!
    \fn void QFxItem::keyPress(QObject *event)

    This signal is emitted when a key is pressed.

    The key event is available in QML via the QFxKeyEvent \c event
    property.

    \qml
    <Item onKeyPress="if (event.key == Qt.Key_Enter) state='Enter'"/>
    \endqml

    \sa keyRelease()
*/

/*!
    \fn void QFxItem::keyRelease(QObject *event)

    This signal is emitted when a key is released.

    The key event is available in QML via the QFxKeyEvent \c event
    property.

    \qml
    <Item onKeyRelease="if (event.key == Qt.Key_Enter) state='Enter'"/>
    \endqml

    \sa keyPress()
*/

/*!
    \fn void QFxItem::visibleChanged()

    This signal is emitted when the visibility of the item changes.

    \sa setVisible()
*/

/*!
    \fn void QFxItem::opacityChanged()

    This signal is emitted when the opacity of the item changes.

    \sa opacity(), setOpacity()
*/

/*!
    \fn void QFxItem::parentChanged()

    This signal is emitted when the parent of the item changes.

    \sa setItemParent()
*/

/*!
    \fn void QFxItem::focusChanged()

    This signal is emitted when the item's focus state changes.

    \sa setFocus()
*/

/*!
    \fn QFxItem::QFxItem(QFxItem *parent)

    Constructs a QFxItem with the given \a parent.
*/
QFxItem::QFxItem(QFxItem* parent)
  : QSimpleCanvasItem(*(new QFxItemPrivate), parent)
{
    Q_D(QFxItem);
    d->init(parent);
}

/*! \internal
*/
QFxItem::QFxItem(QFxItemPrivate &dd, QFxItem *parent)
  : QSimpleCanvasItem(dd, parent)
{
    Q_D(QFxItem);
    d->init(parent);
}

/*! \internal
*/
void QFxItem::doUpdate()
{
    update();
}

/*!
    Destroys the QFxItem.
*/
QFxItem::~QFxItem()
{
    Q_D(QFxItem);
    delete d->_anchorLines; d->_anchorLines = 0;
}

/*!
    \qmlproperty enum Item::transformOrigin
    This property holds the origin point around which scale and rotation transform.

    Nine transform origins are available, as shown in the image below.

    \image declarative-transformorigin.png

    This example scales an image about its center.
    \code
    <Image src="myimage.png" transformOrigin="Center" scale="4" />
    \endcode

    The default transform origin is \c TopLeft.
*/
/*!
    \qmlproperty Item Item::parent
    This property holds the parent of the item.
*/
void QFxItem::setItemParent(QFxItem *parent)
{
    setParent(parent);
}

/*!
    XXX Playing around with view2view transitions.
 */
void QFxItem::moveToParent(QFxItem *parent)
{
    if(parent && itemParent()) {
        QPointF me = itemParent()->mapToScene(QPointF(0,0));
        QPointF them = parent->mapToScene(QPointF(0,0));

        QPointF themx = parent->mapToScene(QPointF(1,0));
        QPointF themy = parent->mapToScene(QPointF(0,1));

        themx -= them;
        themy -= them;

        setItemParent(parent);

        // XXX - this is silly and will only work in a few cases

        /*
            xDiff = rx * themx_x + ry * themy_x
            yDiff = rx * themx_y + ry * themy_y
         */

        qreal rx = 0;
        qreal ry = 0;
        qreal xDiff = them.x() - me.x();
        qreal yDiff = them.y() - me.y();


        if(themx.x() == 0.) {
            ry = xDiff / themy.x();
            rx = (yDiff - ry * themy.y()) / themx.y();
        } else if(themy.x() == 0.) {
            rx = xDiff / themx.x();
            ry = (yDiff - rx * themx.y()) / themy.y();
        } else if(themx.y() == 0.) {
            ry = yDiff / themy.y();
            rx = (xDiff - ry * themy.x()) / themx.x();
        } else if(themy.y() == 0.) {
            rx = yDiff / themx.y();
            ry = (xDiff - rx * themx.x()) / themy.x();
        } else {
            qreal div = (themy.x() * themx.y() - themy.y() * themx.x());

            if(div != 0.) 
                rx = (themx.y() * xDiff - themx.x() * yDiff) / div;

           if(themy.y() != 0.) ry = (yDiff - rx * themx.y()) / themy.y();
        }

        setX(x() - rx);
        setY(y() - ry);
    } else {
        setItemParent(parent);
    }
}

/*!
    Returns the QFxItem parent of this item.
*/
QFxItem *QFxItem::itemParent() const
{
    return qobject_cast<QFxItem *>(QObject::parent());
}

/*!
    \qmlproperty list<Item> Item::children
    \qmlproperty list<Object> Item::resources

    The children property contains the list of visual children of this element. 
    The resources property contains non-visual resources that you want to 
    reference by name.
    
    Generally you can rely on Item's default property to handle all this for
    you, but it can come in handy in some cases.

    \qml
    <Item>
        <children>
            <Text />
            <Rect />
        </children>
        <resources>
            <Component id="myComponent">
                <Text />
            </Component>
        </resources>
    </Item>
    \endqml
*/

/*!
    Returns true if all of the attributes set via QML have been set;
    otherwise returns false.

    \sa classComplete()
*/
bool QFxItem::isClassComplete() const
{
    Q_D(const QFxItem);
    return d->_classComplete;
}

/*!
    Returns true if construction of the QML component is complete; otherwise
    returns false.
    
    It is often desireable to delay some processing until the component is
    completed.

    \sa componentComplete().
*/
bool QFxItem::isComponentComplete() const
{
    Q_D(const QFxItem);
    return d->_componentComplete;
}

/*!
    \property QFxItem::anchors
    \brief The anchors (alignments) used by the item.
*/
QFxAnchors *QFxItem::anchors()
{
    Q_D(QFxItem);
    return d->anchors();
}

void QFxItemPrivate::data_removeAt(int)
{
    // ###
}

int QFxItemPrivate::data_count() const
{
    // ###
    return 0;
}

void QFxItemPrivate::data_append(QObject *o)
{
    Q_Q(QFxItem);
    QFxItem *i = qobject_cast<QFxItem *>(o);
    if(i)
        q->children()->append(i);
    else
        resources_append(o);
}

void QFxItemPrivate::data_insert(int, QObject *)
{
    // ###
}

QObject *QFxItemPrivate::data_at(int) const
{
    // ###
    return 0;
}

void QFxItemPrivate::data_clear()
{
    // ###
}

void QFxItemPrivate::resources_removeAt(int)
{
    // ###
}

int QFxItemPrivate::resources_count() const
{
    // ###
    return 0;
}

void QFxItemPrivate::resources_append(QObject *o)
{
    Q_Q(QFxItem);
    o->setParent(q);
}

void QFxItemPrivate::resources_insert(int, QObject *)
{
    // ###
}

QObject *QFxItemPrivate::resources_at(int) const
{
    // ###
    return 0;
}

void QFxItemPrivate::resources_clear()
{
    // ###
}

void QFxItemPrivate::children_removeAt(int)
{
    // ###
}

int QFxItemPrivate::children_count() const
{
    // ###
    return 0;
}

void QFxItemPrivate::children_append(QFxItem *i)
{
    Q_Q(QFxItem);
    i->setParent(q);
}

void QFxItemPrivate::children_insert(int, QFxItem *)
{
    // ###
}

QFxItem *QFxItemPrivate::children_at(int) const
{
    // ###
    return 0;
}

void QFxItemPrivate::children_clear()
{
    // ###
}

/*!
    \qmlproperty list<Object> Item::data
    \default

    The data property is allows you to freely mix visual children and resources
    of an element.  If you assign a visual element to the data list it becomes
    a child and if you assign any other object type, it is added as a resource.

    So you can write:
    \qml
    <Item>
        <Text />
        <Rect />
        <Script />
    </Item>
    \endqml

    instead of:
    \qml
    <Item>
        <children>
            <Text />
            <Rect />
        </children>
        <resources>
            <Script/>
        </resources>
    </Item>
    \endqml

    data is a behind-the-scenes property: you should never need to explicitly 
    specify it.
 */
QmlList<QObject *> *QFxItem::data()
{
    Q_D(QFxItem);
    return &d->data;
}

/*!
    \property QFxItem::contents
    \brief An object that knows about the size of an item's children.

    contents provides an easy way to access the (collective) width and
    height of the item's children.
*/
QFxContents *QFxItem::contents()
{
    Q_D(QFxItem);
    if (!d->_contents) {
        d->_contents = new QFxContents;
        d->_contents->setParent(this);
        d->_contents->setItem(this);
    }
    return d->_contents;
}

QFxItem *QFxItem::qmlItem() const
{
    Q_D(const QFxItem);
    return d->qmlItem;
}

/*!
    \qmlproperty string Item::qml
    This property holds the dynamic QML for the item.

    This property is used for dynamically loading QML into the
    item. Querying for the QML only has meaning if the QML has been
    dynamically set; otherwise an empty string is returned.
*/
QString QFxItem::qml() const
{
    Q_D(const QFxItem);
    return d->_qml;
}

void QFxItem::setQml(const QString &qml)
{
    Q_D(QFxItem);
    if (d->_qml == qml)
        return;

    if(!d->_qml.isEmpty()) {
        QmlChildren::Iterator iter = d->_qmlChildren.find(d->_qml);
        if(iter != d->_qmlChildren.end())
            (*iter)->setOpacity(0.);
    }

    d->_qml = qml;
    d->_qmlurl = itemContext()->resolvedUri(qml);
    d->qmlItem = 0;

    if(d->_qml.isEmpty()) {
        emit qmlChanged();
        return;
    }

    QmlChildren::Iterator iter = d->_qmlChildren.find(d->_qml);
    if(iter != d->_qmlChildren.end()) {
        (*iter)->setOpacity(1.);
        d->qmlItem = (*iter);
        emit qmlChanged();
    } else {
        d->_qmlcomp = 
            new QmlComponent(itemContext()->engine(), d->_qmlurl, this);
        if(!d->_qmlcomp->isLoading())
            qmlLoaded();
        else
            QObject::connect(d->_qmlcomp, SIGNAL(statusChanged(QmlComponent::Status)),
                             this, SLOT(qmlLoaded()));
    }
}


void QFxItem::qmlLoaded()
{
    Q_D(QFxItem);

    { // newChild...
        // ###
        for (int i=0; i<d->_qmlnewloading.length(); ++i) {
            QmlComponent *c = d->_qmlnewcomp.at(i);
            if(c->isLoading())
                continue;

            QmlContext *ctxt = new QmlContext(itemContext());
            QObject* o = c ? c->create(ctxt):0;
            QFxItem* ret = qobject_cast<QFxItem*>(o);
            if (ret) {
                ret->setItemParent(this);
                QScriptValue v = itemContext()->engine()->scriptEngine()->newQObject(ret);
                emit newChildCreated(d->_qmlnewloading.at(i).toString(),v);
            }

            delete c;
            d->_qmlnewloading.removeAt(i);
            d->_qmlnewcomp.removeAt(i);
            --i;
        }
    }

    // setQml...
    if (d->_qmlcomp) {
        QmlContext *ctxt = new QmlContext(itemContext());
        ctxt->addDefaultObject(this);

        QObject *obj = d->_qmlcomp->create(ctxt);
        QFxItem *qmlChild = qobject_cast<QFxItem *>(obj);
        if(qmlChild) {
            qmlChild->setItemParent(this);
            d->_qmlChildren.insert(d->_qml, qmlChild);
            d->qmlItem = qmlChild;
        } else {
            delete qmlChild;
            d->_qml = QString();
        }
        delete d->_qmlcomp;
        d->_qmlcomp = 0;
        emit qmlChanged();
    }
}

/*!
  \qmlproperty real Item::x
  \qmlproperty real Item::y
  \qmlproperty int Item::width
  \qmlproperty int Item::height

  Defines the item's position and size relative to its parent.

  \qml
  <Item x="100" y="100" width="100" height="100" />
  \endqml
 */

/*!
  \qmlproperty real Item::z

  Sets the stacking order of the item.  By default the stacking order is 0.
    
  Items with a higher stacking value are drawn on top of items with a
  lower stacking order.  Items with the same stacking value are drawn
  bottom up in the order they appear.  Items with a negative stacking
  value are drawn under their parent's content.
    
  The following example shows the various effects of stacking order.

  \table
  \row
  \o \image declarative-item_stacking1.png
  \o Same \c z - later children above earlier children:
  \qml
  <Item>
    <Rect color="red" width="100" height="100" />
    <Rect color="blue" x="50" y="50" width="100" height="100" />
  </Item>
  \endqml
  \row
  \o \image declarative-item_stacking2.png
  \o Higher \c z on top:
  \qml
  <Item>
    <Rect z="1" color="red" width="100" height="100" />
    <Rect color="blue" x="50" y="50" width="100" height="100" />
  </Item>
  \endqml
  \row
  \o \image declarative-item_stacking3.png
  \o Same \c z - children above parents:
  \qml
  <Item>
    <Rect color="red" width="100" height="100">
      <Rect color="blue" x="50" y="50" width="100" height="100" />
    </Rect>
  </Item>
  \endqml
  \row
  \o \image declarative-item_stacking4.png
  \o Lower \c z below:
  \qml
  <Item>
    <Rect color="red" width="100" height="100">
      <Rect z="-1" color="blue" x="50" y="50" width="100" height="100" />
    </Rect>
  </Item>
  \endqml
  \endtable
 */
/*!
  \property QFxItem::z
  \brief The z coordinate of the item relative to its parent.

  A negative z coordinate means the item will be painted below its parent.
*/

void QFxItem::geometryChanged(const QRectF &newGeometry, 
                              const QRectF &oldGeometry)
{
    Q_D(QFxItem);
    if(newGeometry.width() != oldGeometry.width()) {
        int xoffset = oldGeometry.width() - newGeometry.width();
        d->handleWidthChange(xoffset);
    }

    if(newGeometry.height() != oldGeometry.height()) {
        int yoffset = oldGeometry.height() - newGeometry.height();
        d->handleHeightChange(yoffset);
    }

    if(newGeometry.x() != oldGeometry.x()) {
        emit leftChanged();
        emit hcenterChanged();
        emit rightChanged();
    }

    if(newGeometry.y() != oldGeometry.y()) {
        emit topChanged();
        emit vcenterChanged();
        emit bottomChanged();
    }
}

void QFxItemPrivate::handleWidthChange(int xoffset)
{
    Q_Q(QFxItem);
    if(!_anchors) {
        emit q->hcenterChanged();
        emit q->rightChanged();
    } else {
        QFxAnchors::UsedAnchors used = anchors()->usedAnchors();
        if (used & QFxAnchors::HasHCenterAnchor) {
            q->setX(q->x() + xoffset/2);
            emit q->rightChanged();
        } else if ((used & QFxAnchors::HasRightAnchor) && !(used & QFxAnchors::HasLeftAnchor)) {
            q->setX(q->x() + xoffset);
            emit q->hcenterChanged();
        } else {
            emit q->hcenterChanged();
            emit q->rightChanged();
        }
    }
    if(q->rotation() && q->transformOrigin() != QFxItem::TopLeft)
        q->setRotation(q->rotation());
    if(q->scale() && q->transformOrigin() != QFxItem::TopLeft)
        q->setScale(q->scale());
    emit q->widthChanged();
}

void QFxItemPrivate::handleHeightChange(int yoffset)
{
    Q_Q(QFxItem);
    if(!_anchors) {
        emit q->vcenterChanged();
        emit q->bottomChanged();
        emit q->baselineChanged();
    } else {
        QFxAnchors::UsedAnchors used = anchors()->usedAnchors();
        if (used & QFxAnchors::HasBaselineAnchor) {
            q->setY(q->y() + yoffset - q->baselineOffset());
            emit q->bottomChanged();
            emit q->vcenterChanged();
        } else if (used & QFxAnchors::HasVCenterAnchor) {
            q->setY(q->y() + yoffset/2);
            emit q->bottomChanged();
        } else if ((used & QFxAnchors::HasBottomAnchor) && !(used & QFxAnchors::HasTopAnchor)) {
            q->setY(q->y() + yoffset);
            emit q->vcenterChanged();
        } else {
            emit q->vcenterChanged();
            emit q->bottomChanged();
            emit q->baselineChanged();
        }
    }
    if(q->rotation() && q->transformOrigin() != QFxItem::TopLeft)
        q->setRotation(q->rotation());
    if(q->scale() && q->transformOrigin() != QFxItem::TopLeft)
        q->setScale(q->scale());
    emit q->heightChanged();
}

/*!
  \qmlproperty bool Item::flipVertically
  \qmlproperty bool Item::flipHorizontally

  When set, the item will be displayed flipped horizontally or vertically
  about its center.
 */
bool QFxItem::flipVertically() const
{
    return flip() & VerticalFlip;
}

void QFxItem::setFlipVertically(bool v)
{
    if(v)
        setFlip((QSimpleCanvasItem::Flip)(flip() | VerticalFlip));
    else
        setFlip((QSimpleCanvasItem::Flip)(flip() & ~VerticalFlip));
}

bool QFxItem::flipHorizontally() const
{
    return flip() & HorizontalFlip;
}

void QFxItem::setFlipHorizontally(bool v)
{
    if(v)
        setFlip((QSimpleCanvasItem::Flip)(flip() | HorizontalFlip));
    else
        setFlip((QSimpleCanvasItem::Flip)(flip() & ~HorizontalFlip));
}

class QFxKeyEvent : public QObject
{
    Q_OBJECT
    Q_PROPERTY(int key READ key);
    Q_PROPERTY(QString text READ text);
    Q_PROPERTY(bool accepted READ isAccepted WRITE setAccepted);
public:
    QFxKeyEvent(int key, const QString &text=QString()) : _accepted(false), _key(key), _text(text) {}

    bool isAccepted() { return _accepted; }
    void setAccepted(bool accepted) { _accepted = accepted; }

    int key() const { return _key; }

    QString text() const { return _text; }

private:
    bool _accepted;
    int _key;
    QString _text;
};

/*!
  \reimp
*/
void QFxItem::keyPressEvent(QKeyEvent *event)
{
    QFxKeyEvent ke(event->key(), event->text());
    emit keyPress(&ke);
    event->setAccepted(ke.isAccepted());
    if (itemParent() && !ke.isAccepted())
        itemParent()->keyPressEvent(event);
}

/*!
  \reimp
*/
void QFxItem::keyReleaseEvent(QKeyEvent *event)
{
    QFxKeyEvent ke(event->key(), event->text());
    emit keyRelease(&ke);
    event->setAccepted(ke.isAccepted());
    if (itemParent() && !ke.isAccepted())
        itemParent()->keyReleaseEvent(event);
}

/*!
  Returns the bounding rectangle of the item in scene coordinates.
*/
QRectF QFxItem::sceneBoundingRect() const
{
    return QRectF(mapToScene(QPointF(0,0)), QSize(width(), height()));
}

/*!
  \qmlproperty string Item::id
  This property holds the identifier for the item.
  
  The identifier can be used in bindings and other expressions to
  refer to the item. For example:

  \qml
  <Text id="myText" .../>
  <Text text="{myText.text}"/>
  \endqml

  The identifier is available throughout to the \l {components}{component}
  where it is declared.  Two items in the same component
  with the same identifier is invalid.
*/
QString QFxItem::id() const
{
    Q_D(const QFxItem);
    return d->_id;
}

void QFxItem::setId(const QString &id)
{
    Q_D(QFxItem);
    setObjectName(id);
    d->_id = id;
}

QFxAnchorLine QFxItem::left() const
{
    Q_D(const QFxItem);
    return d->anchorLines()->left;
}

QFxAnchorLine QFxItem::right() const
{
    Q_D(const QFxItem);
    return d->anchorLines()->right;
}

QFxAnchorLine QFxItem::horizontalCenter() const
{
    Q_D(const QFxItem);
    return d->anchorLines()->hCenter;
}

QFxAnchorLine QFxItem::top() const
{
    Q_D(const QFxItem);
    return d->anchorLines()->top;
}

QFxAnchorLine QFxItem::bottom() const
{
    Q_D(const QFxItem);
    return d->anchorLines()->bottom;
}

QFxAnchorLine QFxItem::verticalCenter() const
{
    Q_D(const QFxItem);
    return d->anchorLines()->vCenter;
}

/*!
  \qmlproperty AnchorLine Item::top
  \qmlproperty AnchorLine Item::bottom
  \qmlproperty AnchorLine Item::left
  \qmlproperty AnchorLine Item::right
  \qmlproperty AnchorLine Item::horizontalCenter
  \qmlproperty AnchorLine Item::verticalCenter

  The anchor lines of the item.

  For more information see \l {anchor-layout}{Anchor Layouts}.
*/

/*!
  \qmlproperty AnchorLine Item::anchors.top
  \qmlproperty AnchorLine Item::anchors.bottom
  \qmlproperty AnchorLine Item::anchors.left
  \qmlproperty AnchorLine Item::anchors.right
  \qmlproperty AnchorLine Item::anchors.horizontalCenter
  \qmlproperty AnchorLine Item::anchors.verticalCenter

  \qmlproperty Item Item::anchors.fill

  \qmlproperty int Item::anchors.topMargin
  \qmlproperty int Item::anchors.bottomMargin
  \qmlproperty int Item::anchors.leftMargin
  \qmlproperty int Item::anchors.rightMargin
  \qmlproperty int Item::anchors.horizontalCenterOffset
  \qmlproperty int Item::anchors.verticalCenterOffset
  
  Anchors provide a way to position an item by specifying its
  relationship with other items.

  Margins apply to top, bottom, left, right, and fill anchors.

  Offsets apply for horizontal and vertical center anchors.

  \table
  \row
  \o \image declarative-anchors_example.png
  \o Text anchored to Image, horizontally centered and vertically below, with a margin.
  \qml
  <Image id="pic" .../>
  <Text id="label" anchors.horizontalCenter="{pic.horizontalCenter}"
                   anchors.top="{pic.bottom}"
                   anchors.topMargin="5" .../>
  \endqml
  \row
  \o \image declarative-anchors_example2.png
  \o
  Left of Text anchored to right of Image, with a margin. The y
  property of both defaults to 0.

  \qml
    <Image id="pic" .../>
    <Text id="label" anchors.left="{pic.right}"
                     anchors.leftMargin="5" .../>
  \endqml
  \endtable

  anchors.fill provides a convenient way for one item to have the
  same geometry as another item, and is equivalent to connecting all
  four directional anchors.

  \note You can only anchor an item to siblings or a parent.

  For more information see \l {anchor-layout}{Anchor Layouts}.
*/

/*
  \property QFxItem::baseline
  \brief The position of the item's baseline in global (scene) coordinates.

  The baseline of a Text item is the imaginary line on which the text
  sits. Controls containing text usually set their baseline to the
  baseline of their text.

  For non-text items, a default baseline offset of two-thirds of the
  item's height is used to determine the baseline.
*/

int QFxItem::baselineOffset() const
{
    Q_D(const QFxItem);
    if (!d->_baselineOffset.isValid()) {
        return height()*2/3;    //### default baseline is 2/3 of the way to the bottom of the item
    } else
        return d->_baselineOffset;
}

void QFxItem::setBaselineOffset(int offset)
{
    Q_D(QFxItem);
    if (offset == d->_baselineOffset)
        return;

    d->_baselineOffset = offset;
    emit baselineOffsetChanged();
    emit baselineChanged();
}

/*!
  \qmlproperty real Item::rotation
  This property holds the rotation of the item in degrees.

  This specifies how many degrees to rotate the item around its origin (0,0).
  The default rotation is 0 degrees (i.e. not rotated at all).

  \table
  \row
  \o \image declarative-rotation.png
  \o
  \qml
  <Rect color="blue" width="100" height="100">
      <Rect color="green" width="25" height="25"/>
      <Rect color="red" width="50" height="50" x="25" y="25" rotation="30"/>
  </Rect>
  \endqml
  \endtable
*/
qreal QFxItem::rotation() const
{
    Q_D(const QFxItem);
    return d->_rotation;
}

void QFxItem::setRotation(qreal rotation)
{
    Q_D(QFxItem);
    if (d->_rotation == rotation)
        return;
    d->_rotation = rotation;
#if defined(QFX_RENDER_OPENGL)
    QMatrix4x4 trans;
    QPointF to = transformOriginPoint();
    trans.translate(to.x(), to.y());
    trans.rotate(d->_rotation, 0, 0, 1);
    trans.translate(-to.x(), -to.y());
#else
    QTransform trans;
    QPointF to = transformOriginPoint();
    trans.translate(to.x(), to.y());
    trans.rotate(d->_rotation);
    trans.translate(-to.x(), -to.y());
#endif
    setTransform(trans);
    emit rotationChanged();
}

/*!
  \qmlproperty real Item::scale
  This property holds the scale of the item.

  A scale of less than 1 means the item will be displayed smaller than
  normal, and a scale of greater than 1 means the item will be
  displayed larger than normal.  A negative scale means the item will
  be mirrored.

  By default, items are displayed at a scale of 1 (i.e. at their
  normal size).

  Scaling is from the item's origin (0,0).

  \table
  \row
  \o \image declarative-scale.png
  \o
  \qml
  <Rect color="blue" width="100" height="100">
      <Rect color="green" width="25" height="25"/>
      <Rect color="red" width="50" height="50" x="25" y="25" scale="1.4"/>
  </Rect>
  \endqml
  \endtable
*/
qreal QFxItem::scale() const
{
    return QSimpleCanvasItem::scale();
}

void QFxItem::setScale(qreal s)
{
    if (QSimpleCanvasItem::scale() == s) return;
    QSimpleCanvasItem::setScale(s);
    emit scaleChanged();
    update();
}

/*!
  \qmlproperty real Item::opacity

  The opacity of the item.  Opacity is specified as a number between 0
  (fully transparent) and 1 (fully opaque).  The default is 1.

  Opacity is an \e inherited attribute.  That is, the opacity is
  also applied individually to child items.  In almost all cases this
  is what you want.  If you can spot the issue in the following
  example, you might need to use an opacity filter (not yet available) instead.

  \table
  \row
  \o \image declarative-item_opacity1.png
  \o
  \qml
  <Item>
    <Rect color="red" width="100" height="100">
      <Rect color="blue" x="50" y="50" width="100" height="100" />
    </Rect>
  </Item>
  \endqml
  \row
  \o \image declarative-item_opacity2.png
  \o
  \qml
  <Item>
    <Rect opacity="0.5" color="red" width="100" height="100">
      <Rect color="blue" x="50" y="50" width="100" height="100" />
    </Rect>
  </Item>
  \endqml
  \endtable
*/

qreal QFxItem::opacity() const
{
    return QSimpleCanvasItem::visible();
}

void QFxItem::setOpacity(qreal v)
{
    if(v == QSimpleCanvasItem::visible())
        return;

    if(v < 0) v = 0;
    else if(v > 1) v = 1;
    QSimpleCanvasItem::setVisible(v);

    emit opacityChanged();
}

bool QFxItem::keepMouseGrab() const
{
    Q_D(const QFxItem);
    return d->_keepMouse;
}

void QFxItem::setKeepMouseGrab(bool keep)
{
    Q_D(QFxItem);
    d->_keepMouse = keep;
}

void QFxItem::activeFocusChanged(bool)
{
    emit activeFocusChanged();
}

void QFxItem::focusChanged(bool)
{
    emit focusChanged();
}

QmlList<QFxItem *> *QFxItem::children()
{
    Q_D(QFxItem);
    return &(d->children);
}

QmlList<QObject *> *QFxItem::resources()
{
    Q_D(QFxItem);
    return &(d->resources);
}

/*!
  \qmlproperty list<State> Item::states
  This property holds a list of states defined by the item.

  \qml
  <Item>
    <states>
      <State .../>
      <State .../>
            ...
    </states>
  </Item>
  \endqml

  \sa {states-transitions}{States and Transitions}
*/
QmlList<QmlState *>* QFxItem::states()
{
    Q_D(QFxItem);
    return d->states()->statesProperty();
}

/*!
  \qmlproperty list<Transition> Item::transitions
  This property holds a list of transitions defined by the item.

  \qml
  <Item>
    <transitions>
      <Transition .../>
      <Transition .../>
            ...
    </transitions>
  </Item>
  \endqml

  \sa {states-transitions}{States and Transitions}
*/
QmlList<QmlTransition *>* QFxItem::transitions()
{
    Q_D(QFxItem);
    return d->states()->transitionsProperty();
}

/*!
  \qmlproperty list<Filter> Item::filter
  This property holds a list of graphical filters to be applied to the item.

  \l {Filter}{Filters} include things like \l {Blur}{blurring}
  the item, or giving it a \l Reflection.  Some
  filters may not be available on all canvases; if a filter is not
  available on a certain canvas, it will simply not be applied for
  that canvas (but the XML will still be considered valid).

  \qml
  <Item>
    <filter>
      <Blur .../>
      <Relection .../>
            ...
    </filter>
  </Item>
  \endqml
*/

/*!
  \qmlproperty bool Item::clip
  This property holds whether clipping is enabled.

  if clipping is enabled, an item will clip its own painting, as well
  as the painting of its children, to its bounding rectangle.

  Non-rectangular clipping regions are not supported for performance reasons.
*/

/*!
  Returns the state with \a name.  Returns 0 if no matching state is found.
*/
QmlState *QFxItem::findState(const QString &name) const
{
    Q_D(const QFxItem);
    if(!d->_stateGroup)
        return 0;
    else
        return d->_stateGroup->findState(name);
}

/*!
  \qmlproperty string Item::state

  This property holds the name of the current state of the item.

  This property is often used in scripts to change between states. For
  example:

  \qml
    <Script>
        function toggle() {
            if (button.state == 'On')
                button.state = 'Off';
            else
                button.state = 'On';
        }
    </Script>
  \endqml

  If the item is in its base state (i.e. no explicit state has been
  set), \c state will be a blank string. Likewise, you can return an
  item to its base state by setting its current state to \c ''.

  \sa {states-transitions}{States and Transitions}
*/
QString QFxItem::state() const
{
    Q_D(const QFxItem);
    if(!d->_stateGroup)
        return QString();
    else
        return d->_stateGroup->state();
}

void QFxItem::setState(const QString &state)
{
    Q_D(QFxItem);
    d->states()->setState(state);
}

/*!
  \qmlproperty list<Transform> Item::transform
  This property holds the list of transformations to apply.

  For more information see \l Transform.
*/
QList<QFxTransform *> *QFxItem::transform()
{
    Q_D(QFxItem);
    return &(d->_transform);
}

/*!
  Returns true if the item is visible; otherwise returns false.

  An item is considered visible if its opacity is not 0.
*/
bool QFxItem::isVisible() const
{
    Q_D(const QFxItem);
    return d->visible;
}

/*!
  Sets the visibility of the item to \a visible.

  Setting visibility to false sets opacity to 0.  Setting the
  visibility to true restores the opacity to its previous value.
*/
void QFxItem::setVisible(bool visible)
{
    Q_D(QFxItem);
    if(visible == d->visible)
        return;

    d->visible = visible;
    if(visible)
        setOpacity(d->visibleOp);
    else {
        d->visibleOp = opacity();
        setOpacity(0);
    }

    emit visibleChanged();
}

/*! \internal
*/
void QFxItem::dump(int depth)
{
    Q_D(QFxItem);
    QByteArray ba(depth * 4, ' ');
    qWarning() << ba.constData() << metaObject()->className() << "(" << (void *)static_cast<QFxItem*>(this) << ", " << (void *)static_cast<QSimpleCanvasItem*>(this) << "):" << x() << y() << width() << height() << (void *) itemParent();
}

/*! \internal
*/
QString QFxItem::propertyInfo() const
{
    return QString();
}

/*!
  Creates a new child of the given component \a type.  The
  newChildCreated() signal will be emitted when and if the child is
  successfully created.

  \preliminary
*/
void QFxItem::newChild(const QString &type)
{
    Q_D(QFxItem);

    QUrl url = itemContext()->resolvedUri(type);
    if (url.isEmpty())
        return;

    d->_qmlnewloading.append(url);
    d->_qmlnewcomp.append(new QmlComponent(itemContext()->engine(), url, this));

    if(!d->_qmlnewcomp.last()->isLoading())
        qmlLoaded();
    else
        connect(d->_qmlnewcomp.last(), SIGNAL(statusChanged(QmlComponent::Status)), 
                this, SLOT(qmlLoaded()));
}

/*!
  classBegin() is called when the item is constructed, but its
  properties have not yet been set.

  \sa classComplete(), componentComplete(), isClassComplete(), isComponentComplete()
*/
void QFxItem::classBegin()
{
    Q_D(QFxItem);
    d->_classComplete = false;
    d->_componentComplete = false;
    if(d->_stateGroup)
        d->_stateGroup->classBegin();
}

/*!
  classComplete() is called when all properties specified in QML
  have been assigned.  It is sometimes desireable to delay some
  processing until all property assignments are complete.
*/
void QFxItem::classComplete()
{
#ifdef Q_ENABLE_PERFORMANCE_LOG
    QFxPerfTimer<QFxPerf::ItemClassComplete> cc;
#endif
    Q_D(QFxItem);
    d->_classComplete = true;
    if(d->_stateGroup)
        d->_stateGroup->classComplete();
}

/*!
  componentComplete() is called when all elements in the component
  have been constructed.  It is often desireable to delay some
  processing until the component is complete an all bindings in the
  component have been resolved.
*/
void QFxItem::componentComplete()
{
    Q_D(QFxItem);
    d->_componentComplete = true;
    if(d->_stateGroup)
        d->_stateGroup->componentComplete();
    if(d->_anchors) {
        d->anchors()->connectHAnchors();
        d->anchors()->connectVAnchors();
    }
    if(!d->_transform.isEmpty())
        updateTransform();
}

/*! \internal
*/
void QFxItem::parentChanged(QSimpleCanvasItem *, QSimpleCanvasItem *)
{
    emit parentChanged();
}

/*! \internal
*/
void QFxItem::reparentItems()
{
    qFatal("EEK");
}

void QFxItem::updateTransform()
{
    Q_D(QFxItem);
    QSimpleCanvas::Matrix trans;
    for(int ii = d->_transform.count() - 1; ii >= 0; --ii) {
        QFxTransform *a = d->_transform.at(ii);
        if(!a->isIdentity()) 
            trans = a->transform() * trans;
    }

    setTransform(trans);
    transformChanged(trans);
}

void QFxItem::transformChanged(const QSimpleCanvas::Matrix &)
{
}

/*!
  Returns the current QML context for this item.
*/
QmlContext *QFxItem::itemContext() const
{
    Q_D(const QFxItem);
    return d->_ctxt;
}

QmlStateGroup *QFxItemPrivate::states()
{
    Q_Q(QFxItem);
    if(!_stateGroup) {
        _stateGroup = new QmlStateGroup(q);
        if(!_classComplete)
            _stateGroup->classBegin();
        QObject::connect(_stateGroup, SIGNAL(stateChanged(QString)),
                         q, SIGNAL(stateChanged(QString)));
    }

    return _stateGroup;
}

QFxItemPrivate::AnchorLines::AnchorLines(QFxItem *q)
{
    left.item = q;
    left.anchorLine = QFxAnchorLine::Left;
    right.item = q;
    right.anchorLine = QFxAnchorLine::Right;
    hCenter.item = q;
    hCenter.anchorLine = QFxAnchorLine::HCenter;
    top.item = q;
    top.anchorLine = QFxAnchorLine::Top;
    bottom.item = q;
    bottom.anchorLine = QFxAnchorLine::Bottom;
    vCenter.item = q;
    vCenter.anchorLine = QFxAnchorLine::VCenter;
}

#include "qfxitem.moc"
QT_END_NAMESPACE