qdeclarativerepeater.cpp

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#include "private/qdeclarativerepeater_p.h"
#include "private/qdeclarativerepeater_p_p.h"

#include "private/qdeclarativevisualitemmodel_p.h"
#include <private/qdeclarativeglobal_p.h>
#include <qdeclarativelistaccessor_p.h>

#include <qlistmodelinterface_p.h>

QT_BEGIN_NAMESPACE
QDeclarativeRepeaterPrivate::QDeclarativeRepeaterPrivate()
: model(0), ownModel(false)
{
}

QDeclarativeRepeaterPrivate::~QDeclarativeRepeaterPrivate()
{
    if (ownModel)
        delete model;
}

QDeclarativeRepeater::QDeclarativeRepeater(QDeclarativeItem *parent)
  : QDeclarativeItem(*(new QDeclarativeRepeaterPrivate), parent)
{
}

QDeclarativeRepeater::~QDeclarativeRepeater()
{
}

QVariant QDeclarativeRepeater::model() const
{
    Q_D(const QDeclarativeRepeater);
    return d->dataSource;
}

void QDeclarativeRepeater::setModel(const QVariant &model)
{
    Q_D(QDeclarativeRepeater);
    if (d->dataSource == model)
        return;

    clear();
    if (d->model) {
        disconnect(d->model, SIGNAL(itemsInserted(int,int)), this, SLOT(itemsInserted(int,int)));
        disconnect(d->model, SIGNAL(itemsRemoved(int,int)), this, SLOT(itemsRemoved(int,int)));
        disconnect(d->model, SIGNAL(itemsMoved(int,int,int)), this, SLOT(itemsMoved(int,int,int)));
        disconnect(d->model, SIGNAL(modelReset()), this, SLOT(modelReset()));
        /*
        disconnect(d->model, SIGNAL(createdItem(int,QDeclarativeItem*)), this, SLOT(createdItem(int,QDeclarativeItem*)));
        disconnect(d->model, SIGNAL(destroyingItem(QDeclarativeItem*)), this, SLOT(destroyingItem(QDeclarativeItem*)));
    */
    }
    d->dataSource = model;
    QObject *object = qvariant_cast<QObject*>(model);
    QDeclarativeVisualModel *vim = 0;
    if (object && (vim = qobject_cast<QDeclarativeVisualModel *>(object))) {
        if (d->ownModel) {
            delete d->model;
            d->ownModel = false;
        }
        d->model = vim;
    } else {
        if (!d->ownModel) {
            d->model = new QDeclarativeVisualDataModel(qmlContext(this), this);
            d->ownModel = true;
        }
        if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model))
            dataModel->setModel(model);
    }
    if (d->model) {
        connect(d->model, SIGNAL(itemsInserted(int,int)), this, SLOT(itemsInserted(int,int)));
        connect(d->model, SIGNAL(itemsRemoved(int,int)), this, SLOT(itemsRemoved(int,int)));
        connect(d->model, SIGNAL(itemsMoved(int,int,int)), this, SLOT(itemsMoved(int,int,int)));
        connect(d->model, SIGNAL(modelReset()), this, SLOT(modelReset()));
        /*
        connect(d->model, SIGNAL(createdItem(int,QDeclarativeItem*)), this, SLOT(createdItem(int,QDeclarativeItem*)));
        connect(d->model, SIGNAL(destroyingItem(QDeclarativeItem*)), this, SLOT(destroyingItem(QDeclarativeItem*)));
        */
        regenerate();
    }
    emit modelChanged();
    emit countChanged();
}

QDeclarativeComponent *QDeclarativeRepeater::delegate() const
{
    Q_D(const QDeclarativeRepeater);
    if (d->model) {
        if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model))
            return dataModel->delegate();
    }

    return 0;
}

void QDeclarativeRepeater::setDelegate(QDeclarativeComponent *delegate)
{
    Q_D(QDeclarativeRepeater);
    if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model))
       if (delegate == dataModel->delegate())
           return;

    if (!d->ownModel) {
        d->model = new QDeclarativeVisualDataModel(qmlContext(this));
        d->ownModel = true;
    }
    if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model)) {
        dataModel->setDelegate(delegate);
        regenerate();
        emit delegateChanged();
    }
}

int QDeclarativeRepeater::count() const
{
    Q_D(const QDeclarativeRepeater);
    if (d->model)
        return d->model->count();
    return 0;
}

QDeclarativeItem *QDeclarativeRepeater::itemAt(int index) const
{
    Q_D(const QDeclarativeRepeater);
    if (index >= 0 && index < d->deletables.count())
        return d->deletables[index];
    return 0;

}

void QDeclarativeRepeater::componentComplete()
{
    QDeclarativeItem::componentComplete();
    regenerate();
}

QVariant QDeclarativeRepeater::itemChange(GraphicsItemChange change,
                                       const QVariant &value)
{
    QVariant rv = QDeclarativeItem::itemChange(change, value);
    if (change == ItemParentHasChanged) {
        regenerate();
    }

    return rv;
}

void QDeclarativeRepeater::clear()
{
    Q_D(QDeclarativeRepeater);
    bool complete = isComponentComplete();

    if (d->model) {
        while (d->deletables.count() > 0) {
            QDeclarativeItem *item = d->deletables.takeLast();
            if (complete)
                emit itemRemoved(d->deletables.count()-1, item);
            d->model->release(item);
        }
    }
    d->deletables.clear();
}

void QDeclarativeRepeater::regenerate()
{
    Q_D(QDeclarativeRepeater);
    if (!isComponentComplete())
        return;

    clear();

    if (!d->model || !d->model->count() || !d->model->isValid() || !parentItem() || !isComponentComplete())
        return;

    for (int ii = 0; ii < count(); ++ii) {
        QDeclarativeItem *item = d->model->item(ii);
        if (item) {
            QDeclarative_setParent_noEvent(item, parentItem());
            item->setParentItem(parentItem());
            item->stackBefore(this);
            d->deletables << item;
            emit itemAdded(ii, item);
        }
    }
}

void QDeclarativeRepeater::itemsInserted(int index, int count)
{
    Q_D(QDeclarativeRepeater);
    if (!isComponentComplete())
        return;
    for (int i = 0; i < count; ++i) {
        int modelIndex = index + i;
        QDeclarativeItem *item = d->model->item(modelIndex);
        if (item) {
            QDeclarative_setParent_noEvent(item, parentItem());
            item->setParentItem(parentItem());
            if (modelIndex < d->deletables.count())
                item->stackBefore(d->deletables.at(modelIndex));
            else
                item->stackBefore(this);
            d->deletables.insert(modelIndex, item);
            emit itemAdded(modelIndex, item);
        }
    }
    emit countChanged();
}

void QDeclarativeRepeater::itemsRemoved(int index, int count)
{
    Q_D(QDeclarativeRepeater);
    if (!isComponentComplete() || count <= 0)
        return;
    while (count--) {
        QDeclarativeItem *item = d->deletables.takeAt(index);
        emit itemRemoved(index, item);
        if (item)
            d->model->release(item);
        else
            break;
    }
    emit countChanged();
}

void QDeclarativeRepeater::itemsMoved(int from, int to, int count)
{
    Q_D(QDeclarativeRepeater);
    if (!isComponentComplete() || count <= 0)
        return;
    if (from + count > d->deletables.count()) {
        regenerate();
        return;
    }
    QList<QDeclarativeItem*> removed;
    int removedCount = count;
    while (removedCount--)
        removed << d->deletables.takeAt(from);
    for (int i = 0; i < count; ++i)
        d->deletables.insert(to + i, removed.at(i));
    d->deletables.last()->stackBefore(this);
    for (int i = d->model->count()-1; i > 0; --i) {
        QDeclarativeItem *item = d->deletables.at(i-1);
        item->stackBefore(d->deletables.at(i));
    }
}

void QDeclarativeRepeater::modelReset()
{
    if (!isComponentComplete())
        return;
    regenerate();
    emit countChanged();
}

QT_END_NAMESPACE