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

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbWidgets module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** 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 developer.feedback@nokia.com.

**

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

#include <hbdataform.h>

#include <hbdataformmodelitem.h>

#include <hbdataformmodel.h>

#include "hbdataform_p.h"

#include "hbdataformviewitem_p.h"

#include "hbdataitemcontainer_p.h"

#include "hbdatagroup_p.h"

#include "hbdatagroup_p_p.h"

#include <hbcombobox.h>

#include "hbdataformheadingwidget_p.h"

#include "hbtreemodeliterator_p.h"

#include <QGraphicsSceneMouseEvent>

#include <QCoreApplication>

/*!

    @beta

    @hbwidgets

    \class HbDataForm

    \brief HbDataForm represents hierarchical dataitems in the form of groups,pages and 

    items.

    The HbDataForm class provides a default view implementation of dataform.

    A HbDataForm implements a hierarchical representation of data items from a model.

    HbDataForm implements the interfaces defined by the HbAbstractItemView class to allow 

    it to display data provided  by models derived from the QAbstractItemModel class.

    It is simple to construct a dataform displaying data from a model. The user has to create

    HbDataFormModel and create the hierarchy of HbDataFormModelItems .The hierarchy is 

    similar to the following.

    - HbDataForm

       - HbDataFormPage1

         - HbDataGroup1

           - HbDataGroupPage1

             - HbDataItem

             - HbDataItem

             - HbDataItem

             - HbDataItem

       - HbDataFormPage2

         - HbDataGroup2

           - HbDataGroupPage2

             - HbDataItem

             - HbDataItem

             - HbDataItem

             - HbDataItem

    HbDataItem can be the child of HbDataForm, HbDataFormPage,HbDataGroup and 

    HbDataGroupPage. An instance of HbDataForm has to be created and model should be set 

    to the form using setModel(HbDataFormModel) API.

    The properties of each DataItem node can be set using HbDataFormModelItem convenient

    API's. These data are parsed while the visualization instance of each item is created and 

    set on each item.

    The model/view architecture ensures that the contents of the data view are updated as the 

    model changes.

    Items that have children can be in expanded (children are visible) or collapsed 

    (children are hidden) state. DataItems of type HbDataFormPage, HbDataGroup and 

    HbDataGroupPage can be expanded and collapsed. HbDataItem of type FormPageItem, 

    GroupItem, GroupPageItem can only have children. Each item in model is represented by an 

    instance of HbDataFormViewItem. HbDataForm uses HbDataFormViewItem prototype to instantiate 

    the HbDataForm items. HbDataFormViewItem can be subclassed for customization purposes.

    The Model hierarchy can be created using the convenient API's provided on model class like

    appendDataFormPage , appendDataFormGroup ,appendDataFormGroupPage and 

    appendDataFormItem. All of these will return HbDataFormModelItem instance correspoding 

    to each type on which user can set item specific data. Otherwise each HbDataFormModelItem can 

    be created individually by passing the corresponding type of item (GroupItem, GroupPageItem, 

    FormPageItem) and create the tree of HbDataFormModelItem using setParent API 

    or by passing the parent HbDataFormModelItem in constructor. Later the top level 

    HbDataFormModelItem can be added inside the model.

    After doing the setModel, the visualization gets created . Only the items inside the expanded 

    group or group page instances are created. When an item's visualization is created , 

    DataForm emits activated(constQModelIndex&) signal. The application can get 

    HbDataFormViewItem and content widget from DataForm using QModelIndex.    

    The signal emitted by HbDataForm

    \li activated(const QModelIndex &index) Emitted when the HbDataFormViewItem corresponding to

    \a index is shown. User can connect to this signal and can fetch the instance of 

    HbDataFormViewItem from HbDataForm using the API dataFormViewItem(const QModelIndex &index).

    \li dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight) emitted when the 

    HbDataFormModel is updated \atopLeft and \abottomRight will be same since every node has only one column.

    User can connect to this signal and can fetch the instance of HbDataFormViewItem from HbDataForm 

    using the API dataFormViewItem(const QModelIndex &index) or user can fetch HbDataFormModelItem using API 

    itemFromIndex(const QModelIndex &index) in HbDataFormModel .When user updates model using 

    setContentWidgetData API provided in HbDataFormModelItem class, then DataForm takes care of updating the 

    corresponding item's visualization.

    The user can also provide connection information to correspoding content widget of each HbDataFormModelItem

    using API addConnection(HbDataFormModelItem* item, const char* signal, QObject* receiver, consta char* slot)

    provided in HbDataForm class.The connection will be established when the item visualization is created .

    similar way removeConnection(HbDataFormModelItem *item, const char* signal, QObject *receiver, const char* slot)

    and removeAllConnection() API can be used. Connection can be established or removed even at runtime also.

    An example of how to create HbDataForm:

    \snippet{ultimatecodesnippet/ultimatecodesnippet.cpp,31}

    The output generated by the above code looks like:

    \image html hbsettingform.png

    This is how HbDataForm will look like in landscape mode:

    \image html hbsettingform_landscape.png

    \sa HbDataFormViewItem, HbDataFormModel, HbDataFormModelItem

    Creating Custom Item:

    Application developer can create custom DataItem by deriving from HbDataFormViewItem and setting this as 

    prototype(setItemProtoType() API).

    Application has to override virtual API's createCustomWidget() , restore()and save(). 

    createCustomWidget() API should return the corresponding custom HbWidget which can also be a compound widget.

    Signal connection for child widgets inside the compound widget should taken care by the application. 

    restore() API will be called by the framework when the model data is changed.

    So restore() should take care of updating the visual items with correspoding data from model. 

    save() API should update the model.App developer should  connect respective widgets SIGNALs to SLOT save() 

    and update the data to model .

*/

/*!

    \fn void HbAbstractItemView::activated(const QModelIndex &index)

    This signal is emitted when HbDataFormViewItem corresponding to \a index is shown.

*/

/*!

    Constructs DataForm with given \a parent.

    \param parent parent .

 */

HbDataForm::HbDataForm(QGraphicsItem *parent)

    : HbAbstractItemView(*new HbDataFormPrivate(), new HbDataItemContainer(),

                         new HbTreeModelIterator(0, QModelIndex(), false), parent)

{

    Q_D( HbDataForm );

    d->q_ptr = this;

    d->init();

    setVerticalScrollBarPolicy(ScrollBarAlwaysOff);

    //d->mHeadingWidget->createPrimitives();

    //static_cast<HbDataItemContainer*>(container())->setFormHeading(d->mHeadingWidget);

}

/*!

    Constructs a data form with a private class object \a dd, 

    \a container and \a parent.

*/

HbDataForm::HbDataForm(HbDataFormPrivate &dd, HbAbstractItemContainer *container,

                       QGraphicsItem * parent)

        : HbAbstractItemView(dd, container, new HbTreeModelIterator(0, QModelIndex(), false), parent)

{

    Q_D( HbDataForm );

    d->q_ptr = this;

    d->init();

}

/*!

    Destructs the data form.

*/

HbDataForm::~HbDataForm()

{

}

/*!

    \reimp

    Scrolls the view so that the item represented by \a index comes at the middle of 

    screen. By default HbDataForm does not scrolls. Application developer is supposed to 

    call this API if he wants this behaviour. User can connect to activated signal and then

    can call this API.

*/

void HbDataForm::scrollTo(const QModelIndex &index, ScrollHint hint)

{

    //Q_D(HbDataForm);

    //d->revealItem(d->mContainer->itemByIndex(index), PositionAtCenter);

    HbAbstractItemView::scrollTo(index, hint);

}

/*!

    \deprecated HbDataForm::indexCount() const

        is deprecated. Use \a HbModelIterator::indexCount() const

    \reimp

    Returns the number of children visible in the hierarchy. Children of collapsed parents are

    not taken into account.

*/

int HbDataForm::indexCount() const

{

    qWarning("HbDataForm::indexCount() is deprecated! Use HbModelIterator::indexCount() const.");

    Q_D(const HbDataForm);

    int bufferSize = 0;

    if (model()) {

        QModelIndex root = rootIndex();

        int rowCount = d->treeModelIterator()->childCount(root);

        for (int row = 0; row < rowCount; ++row) {

            bufferSize += d->childCount(d->treeModelIterator()->child(row, root));

        }

        bufferSize += rowCount;

    }

    return bufferSize;

}

/*!

    \deprecated HbDataForm::nextIndex(const QModelIndex&) const

        is deprecated. Use \a HbModelIterator::nextIndex(const QModelIndex&) const

    \reimp

    Next index for valid index is determined in following way:

    - If index has children and it is expanded then first child is returned

    - Otherwise if index has next sibling then that is returned

    - Otherwise next valid sibling for parent is returned

    - Otherwise QModelIndex is returned

*/

QModelIndex HbDataForm::nextIndex(const QModelIndex &index) const

{

    qWarning("HbDataForm::nextIndex(const QModelIndex&) const is deprecated! Use HbModelIterator::nextIndex(const QModelIndex&).");

    Q_D(const HbDataForm);

    if (index.isValid() && index.column() == 0) {

        QModelIndex result;

        if (isExpanded(index)) {

            result = index.child(0, 0);

        }

        if (!result.isValid()) {

            result = index.sibling(index.row() + 1, 0);

        }

        if (!result.isValid()) {

            QModelIndex parentIndex(index.parent());

            while (!result.isValid()) {

                if (parentIndex == rootIndex()) {

                    break;

                }

                result = parentIndex.sibling(parentIndex.row() + 1, 0);

                parentIndex = parentIndex.parent();

            }

        }

        return result;

    } else {

        return d->treeModelIterator()->child(0, rootIndex());

    }

}

/*!

    \deprecated HbDataForm::previousIndex(const QModelIndex&) const

        is deprecated. Use \a HbTreeModelIterator::previousIndex(const QModelIndex&) const

    \reimp

    Previous index for valid index is determined in following way:

    - If index has previous sibling last child from it is returned

    - Otherwise previous sibling is returned

    - Otherwise parent index is returned

    - Otherwise QModelIndex is returned

*/

QModelIndex HbDataForm::previousIndex(const QModelIndex &index) const

{

    qWarning("HbDataForm::previousIndex(const QModelIndex&) const is deprecated! Use HbModelIterator::previousIndex(const QModelIndex&) const.");

    Q_D(const HbDataForm);

    if (index.isValid() && index.column() == 0) {

        QModelIndex result(index.sibling(index.row() - 1, 0));

        if (result.isValid()) {

            bool checkChild = true;

            while (checkChild) {

                if (isExpanded(result)) {

                    result = result.child(model()->rowCount(result) - 1, 0);

                } else {

                    checkChild = false;

                }

            }

        }

        if (!result.isValid()) {

            result = index.parent();

            if (result == rootIndex()) {

                result = QModelIndex();

            }

        }

        return result;

    } else {

        QModelIndex result(

                d->treeModelIterator()->child(

                        d->treeModelIterator()->childCount(rootIndex())-1,

                        rootIndex()));

        QModelIndex childIndex;

        bool checkChild = true;

        while (checkChild) {

            if (!isExpanded(result)) {

                checkChild = false;

            } else {

                childIndex = d->treeModelIterator()->child(d->treeModelIterator()->childCount(result) - 1, result);

                if (childIndex.isValid()) {

                    result = childIndex;

                }

            }

        }

        return result;

    }

}

/*!

    @beta

    Sets the item referred to by \a index to either collapse or expanded, 

    depending on the value of \a expanded. If \a expanded is true then child item are 

    supposed to be visible.

    \sa isExpanded

*/

void HbDataForm::setExpanded(const QModelIndex &index, bool expanded)

{

    Q_D(HbDataForm);

    if (isExpanded(index) != expanded) {

        d->treeModelIterator()->itemStateChanged(index, HbDataFormViewItem::ExpansionKey);

        HbDataFormViewItem *item =

            static_cast<HbDataFormViewItem *>(d->mContainer->itemByIndex(index));

        if (item) {

            item->setExpanded(expanded);

        }

        d->mContainer->setItemStateValue(index, HbDataFormViewItem::ExpansionKey, expanded);

        d->mContainer->setModelIndexes();

    }

}

/*!

    @beta

    Returns true if the model item \a index is expanded otherwise returns false.

    \sa setExpanded

*/

bool HbDataForm::isExpanded(const QModelIndex &index) const

{

    Q_D(const HbDataForm);

    QVariant flags = d->mContainer->itemState(index).value(HbDataFormViewItem::ExpansionKey);

    if (flags.isValid() && flags.toBool() == true) {

        return true;

    } else {

        return false;

    }

}

/*!

    @beta

    Sets the heading of HbDataForm with the \a heading provided. Heading is displayed on 

    top of the HbDataForm. Heading is non-focusable.

    \sa heading

*/

void HbDataForm::setHeading(const QString &heading)

{

    Q_D(HbDataForm);

    if(heading.isEmpty() && d->mHeadingWidget) {

        if(!d->mHeadingWidget->mPageCombo && d->mHeadingWidget->mDescription.isEmpty()) {

            // delete the FormheadingWidget

            delete d->mHeadingWidget;

            d->mHeadingWidget = 0;

            // Remove FormheadingWidget from container layout

            HbStyle::setItemName(d->mHeadingWidget,"NULL");

            return;

        }

    }

    if(!d->mHeadingWidget) {

        d->mHeadingWidget = new HbDataFormHeadingWidget();

        HbStyle::setItemName(d->mHeadingWidget,"this");

    }

    d->mHeadingWidget->mHeading = heading;

    d->mHeadingWidget->createPrimitives();

    if(d->mHeadingWidget->mPageCombo || !d->mHeadingWidget->mDescription.isEmpty() || 

        !d->mHeadingWidget->mHeading.isEmpty()) {

        static_cast<HbDataItemContainer*>(container())->setFormHeading(d->mHeadingWidget);

    }

    d->mHeadingWidget->callPolish();

}

/*!

    @beta

    Returns heading of HbDataForm.

    \sa setHeading    

*/

QString HbDataForm::heading() const

{

    Q_D(const HbDataForm);

    if(d->mHeadingWidget) {

        return d->mHeadingWidget->mHeading;

    }

    return QString();

}

/*!

    @beta

    Sets the description of HbDataForm with the \a description. Description is displayed 

    below heading. Description is non-focusable.

    \sa description

*/

void HbDataForm::setDescription(const QString &description)

{

    Q_D(HbDataForm);

    if(description.isEmpty() && d->mHeadingWidget) {

        if(!d->mHeadingWidget->mPageCombo && d->mHeadingWidget->mHeading.isEmpty()) {

            // delete the FormheadingWidget

            delete d->mHeadingWidget;

            d->mHeadingWidget = 0;

            // Remove FormheadingWidget from container layout

            HbStyle::setItemName(d->mHeadingWidget,"NULL");

            return;

        }

    }

    if(!d->mHeadingWidget) {

        d->mHeadingWidget = new HbDataFormHeadingWidget();

        HbStyle::setItemName(d->mHeadingWidget,"this");

    }

    d->mHeadingWidget->mDescription = description;

    d->mHeadingWidget->createPrimitives();

    if(d->mHeadingWidget->mPageCombo || !d->mHeadingWidget->mDescription.isEmpty() || 

        !d->mHeadingWidget->mHeading.isEmpty()) {

        static_cast<HbDataItemContainer*>(container())->setFormHeading(d->mHeadingWidget);

    }

    d->mHeadingWidget->callPolish();

}

/*!

    @beta

    Returns description of HbDataForm.

    \sa setDescription

*/

QString HbDataForm::description() const

{

    Q_D(const HbDataForm);

    if(d->mHeadingWidget) {

        return d->mHeadingWidget->mDescription;

    }

    return QString();

}

/*!

    \reimp

    Returns the style primitive of HbDataForm depending upon the type \a primitive.

    If primitive passed is P_DataForm_background then NULL is returned.

    User cannot customize background of data form.

    \sa primitive

*/

QGraphicsItem* HbDataForm::primitive(HbStyle::Primitive primitive) const

{

    Q_D(const HbDataForm);

    switch (primitive) {

        case HbStyle::P_DataForm_heading:

            return d->mHeadingWidget->mHeadingItem;

        case HbStyle::P_DataForm_description:

            return d->mHeadingWidget->mDescriptionItem;

        default:

            return 0;

    }

}

/*!

    \deprecated HbDataForm::dataFormViewItem(const QModelIndex &index) const

        is deprecated. Please use HbAbstractItemView::itemByIndex instead.

    Returns HbDataFormViewItem for the correspoding \a index passed. Returns

    NULL is index passed is invalid. If \a index passed is not visible then NULL is returned.

    Ideally user should call this API when activate is called for \a index.    

*/

HbDataFormViewItem* HbDataForm::dataFormViewItem(const QModelIndex &index) const

{

    Q_D(const HbDataForm);

    if(index.isValid()) {

        return static_cast<HbDataFormViewItem*>(d->mContainer->itemByIndex(index));

    } else {

        return 0;

    }

}