source: trunk/demos/qtdemo/demoitem.cpp

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**
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** This file is part of the demonstration applications of the Qt Toolkit.
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#include "demoitem.h"
#include "menumanager.h"
#include "guide.h"
#include "colors.h"

QHash<QString, SharedImage *> DemoItem::sharedImageHash;
QMatrix DemoItem::matrix;

DemoItem::DemoItem(QGraphicsScene *scene, QGraphicsItem *parent) : QGraphicsItem(parent, scene)
{
    this->opacity = 1.0;
    this->locked = false;
    this->prepared = false;
    this->neverVisible = false;
    this->noSubPixeling = false;
    this->currentAnimation = 0;
    this->currGuide = 0;
    this->guideFrame = 0;
    this->sharedImage = new SharedImage();
    ++this->sharedImage->refCount;
}

DemoItem::~DemoItem()
{
    if(--this->sharedImage->refCount == 0){
        if (!this->hashKey.isEmpty())
            DemoItem::sharedImageHash.remove(this->hashKey);
        delete this->sharedImage;
    }
}

void DemoItem::setNeverVisible(bool never)
{
    Q_UNUSED(never);
/*
    this->neverVisible = never;
    if (never){
        this->setVisible(false);
        QList<QGraphicsItem *> c = children();
        for (int i=0; i<c.size(); i++){
            DemoItem *d = dynamic_cast<DemoItem *>(c[i]); // Don't use dynamic cast because it needs RTTI support.
            if (d)
                d->setNeverVisible(true);
            else{
                c[i]->setVisible(false);
            }
        }
    }
*/
}

void DemoItem::setRecursiveVisible(bool visible){
    if (visible && this->neverVisible){
        this->setVisible(false);
        return;
    }

    this->setVisible(visible);
    QList<QGraphicsItem *> c = children();
    for (int i=0; i<c.size(); i++){
        // DemoItem *d = dynamic_cast<DemoItem *>(c[i]);
        // if (d)
        //     d->setRecursiveVisible(visible);
        // else{
            c[i]->setVisible(visible);
        // }
    }
}

void DemoItem::useGuide(Guide *guide, float startFrame)
{
    this->startFrame = startFrame;
    this->guideFrame = startFrame;
    while (this->guideFrame > guide->startLength + guide->length()){
        if (guide->nextGuide == guide->firstGuide)
            break;

        guide = guide->nextGuide;
    }
    this->currGuide = guide;
}

void DemoItem::guideAdvance(float distance)
{
    this->guideFrame += distance;
    while (this->guideFrame > this->currGuide->startLength + this->currGuide->length()){
        this->currGuide = this->currGuide->nextGuide;
        if (this->currGuide == this->currGuide->firstGuide)
            this->guideFrame -= this->currGuide->lengthAll();
    }
}

void DemoItem::guideMove(float moveSpeed)
{
    this->currGuide->guide(this, moveSpeed);
}

void DemoItem::setPosUsingSheepDog(const QPointF &dest, const QRectF &sceneFence)
{
    this->setPos(dest);
    if (sceneFence.isNull())
        return;

    // I agree. This is not the optimal way of doing it.
    // But don't want for use time on it now....
    float itemWidth = this->boundingRect().width();
    float itemHeight = this->boundingRect().height();
    float fenceRight = sceneFence.x() + sceneFence.width();
    float fenceBottom = sceneFence.y() + sceneFence.height();

    if (this->scenePos().x() < sceneFence.x()) this->moveBy(this->mapFromScene(QPointF(sceneFence.x(), 0)).x(), 0);
    if (this->scenePos().x() > fenceRight - itemWidth) this->moveBy(this->mapFromScene(QPointF(fenceRight - itemWidth, 0)).x(), 0);
    if (this->scenePos().y() < sceneFence.y()) this->moveBy(0, this->mapFromScene(QPointF(0, sceneFence.y())).y());
    if (this->scenePos().y() > fenceBottom - itemHeight) this->moveBy(0, this->mapFromScene(QPointF(0, fenceBottom - itemHeight)).y());
}

void DemoItem::setGuidedPos(const QPointF &pos)
{
    this->guidedPos = pos;
}

QPointF DemoItem::getGuidedPos()
{
    return this->guidedPos;
}

void DemoItem::switchGuide(Guide *guide)
{
    this->currGuide = guide;
    this->guideFrame = 0;
}

bool DemoItem::inTransition()
{
    if (this->currentAnimation)
        return this->currentAnimation->running();
    else
        return false;
}

void DemoItem::setMatrix(const QMatrix &matrix)
{
    DemoItem::matrix = matrix;
}

void DemoItem::useSharedImage(const QString &hashKey)
{
    this->hashKey = hashKey;