/****************************************************************************
**
** 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 HbCore 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 "hbiconitem.h"
#include "hbiconitem_p.h"
#include "hbiconanimator.h"
#include "hbicon_p.h"
#include "hboogmwatcher_p.h"
#include "hbinstance_p.h"
#include "hbiconengine_p.h"

#include <QPainter>
#include <QStyleOptionGraphicsItem>

/*!
  @stable
  @hbcore
  \class HbIconItem
  \brief HbIconItem displays an icon provided in form of an HbIcon


  HbIconItem derives from HbWidgetBase and so can be added to a layout.
  Use HbIconItem when you need your icon's position and size to be managed by a layout.

  See HbIcon for a list of supported icon graphics file types.

  Example of how to create an HbIconItem and directly set its position and size
  (the HbIconItem is not added to a layout in this case):
  \code
  //Create new icon, set position and size for it
  HbIconItem *icon = new HbIconItem("qtg_large_phonebook", this);
  icon->setPos(10,150);
  icon->setSize(QSizeF(200,20));
  \endcode

  Example of how to create an HbIconItem and set its size to be same as its defaultSize.
  (the HbIconItem is not added to a layout in this case):
  \code
  //Create new icon, set position and size for it
  HbIconItem *icon = new HbIconItem("qtg_large_phonebook", this);
  icon->setPos(10,150);
  icon->setSize(icon->defaultSize());
  \endcode

  Example of how to add HbIconItem to a layout.
  \code
  HbButton *button = new HbButton("Button 1");
  HbIconItem *icon = new HbIconItem("qtg_large_phonebook");
  QGraphicsGridLayout *layout = new QGraphicsGridLayout();

  //No need of setting the position and size. In this case
  //it will be decided by layout.
  layout->addItem(icon, 0, 0);
  layout->addItem(button, 0, 1);
  .
  .
  setLayout(layout);
  \endcode
*/

/*!
    \var static const QIcon::Mode defaultMode
    Default mode of an icon item.
*/

/*!
    \var static const QIcon::State defaultState
    Default state of an icon item.
*/

/*!
    \var static const Qt::AspectRatioMode defaultAspectRatioMode
    Default aspect ratio mode of an icon item.
*/

/*!
    \var static const Qt::Alignment defaultAlignment
    Default alignment of an icon item.
*/

//Initialize the default values
const QIcon::Mode HbIconItem::defaultMode = QIcon::Normal;
const QIcon::State HbIconItem::defaultState = QIcon::Off;
const Qt::AspectRatioMode HbIconItem::defaultAspectRatioMode = Qt::KeepAspectRatio;
    
// Note: No center aligning by default to prevent interesting rounding issues
// in certain cases (e.g. 50.25x50.25 sized icon item would lead to having an
// icon sized 50x50 drawn at (0.12499, 0.12499) which may or may not fit visually
// the other primitives of the same widget).
const Qt::Alignment HbIconItem::defaultAlignment = 0;

bool HbIconItemPrivate::outlinesEnabled = false;

static void asyncReady(void *param)
{
    HbIconItem *item = static_cast<HbIconItem *>(param);
    HbIconItemPrivate *d = HbIconItemPrivate::d_ptr(item);
    bool doUpdate = d->mAsyncFilter ? !d->mAsyncFilter(item, d->mAsyncFilterParam) : true;
    if (doUpdate) {
        item->update();
    }
}

HbIconItemPrivate::HbIconItemPrivate(const HbIcon &icon) :
    mIcon(icon),
    mAnimator(),
    mAlignment(HbIconItem::defaultAlignment),
    mAspectRatioMode(HbIconItem::defaultAspectRatioMode),
    mState(HbIconItem::defaultState),
    mMode(HbIconItem::defaultMode),
    mClearCachedRect(true),
    mIconScalingEnabled(true),
    mAsync(false),
    mAsyncFilter(0),
    mAsyncFilterParam(0)
{
    q_ptr = 0;
}

HbIconItemPrivate::~HbIconItemPrivate()
{
}

void HbIconItemPrivate::updateIconItem()
{
    Q_Q(HbIconItem);
    if (!mIcon.isNull()) {
        // This must be done before the setIcon() call below due to the
        // possibility of detaching. Doing it afterwards would lead to
        // colorization errors as the themed color might potentially be set for
        // a different icon engine, not for the one that is used in painting.
        HbIconPrivate *p = HbIconPrivate::d_ptr_detached(&mIcon);
        p->setThemedColor(mThemedColor);
        p->setAsync(mAsync, asyncReady, q);
    }
    const QRectF boundingRect = q->rect();
    if (!boundingRect.size().isEmpty()) {
        mIconRect = boundingRect;
        mIcon.setSize(mIconScalingEnabled ? mIconRect.size() : mIcon.defaultSize());
        mAnimator.setIcon(mIcon);
        q->update();
    }
}

void HbIconItemPrivate::updateIconParams()
{
    Q_Q(HbIconItem);
    if (mIconRect.isValid()) {
        if (!mIcon.isNull()) {
            HbIconPrivate *p = HbIconPrivate::d_ptr_detached(&mIcon);
            p->setThemedColor(mThemedColor);
            p->setAsync(mAsync, asyncReady, q);
        }
        mAnimator.setIcon(mIcon);
    }
    q->update();
}

void HbIconItemPrivate::recalculateBoundingRect() const
{
    Q_Q(const HbIconItem);
    mBoundingRect = q->HbWidgetBase::boundingRect();
    mClearCachedRect = false;
}

void HbIconItemPrivate::setThemedColor(const QColor &color)
{
    mThemedColor = color;
    updateIconItem();
}

/*!
  Requests clearStoredIconContent() for the currently set icon.
*/
void HbIconItemPrivate::clearStoredIconContent()
{
    HbIconPrivate::d_ptr(&mIcon)->clearStoredIconContent();
}

/*!
  Installs a filter for the async-load-ready callbacks.

  When non-null, the filter is called before invoking update() on the
  icon item, and if the filter returns true, the update() call is
  suppressed.
*/
void HbIconItemPrivate::setAsyncCallbackFilter(AsyncCallbackFilter filter, void *filterParam)
{
    mAsyncFilter = filter;
    mAsyncFilterParam = filterParam;
}

/*!
 Constructs a new HbIconItem with \a iconName and \a parent.
 \param iconName the name of the icon.
 See HbIcon for a description of how the icon name and the icon image filename are related.
 \param parent the graphics item parent of this icon.
 */
HbIconItem::HbIconItem(const QString &iconName, QGraphicsItem *parent) :
    HbWidgetBase(*new HbIconItemPrivate(iconName), parent)
{
    Q_D(HbIconItem);
    d->q_ptr = this;
    // Set this graphics item to be updated on icon animations
    d->mAnimator.setGraphicsItem(this);
    HbOogmWatcher::instance()->registerIconItem(this);
}

/*!
 Constructs a new HbIconItem from HbIcon.
 \param icon contains the icon object that this HbIconItem displays on screen.
 \param parent the graphics item parent of this icon.
 */
HbIconItem::HbIconItem(const HbIcon &icon, QGraphicsItem *parent) :
    HbWidgetBase(*new HbIconItemPrivate(icon), parent)
{
    Q_D(HbIconItem);
    d->q_ptr = this;
    // Set this graphics item to be updated on icon animations
    d->mAnimator.setGraphicsItem(this);
    HbOogmWatcher::instance()->registerIconItem(this);
}

/*!
 Constructs a new HbIconItem from HbIcon.
 \param parent the graphics item parent of this HbIconItem.
 */
HbIconItem::HbIconItem(QGraphicsItem *parent) :
    HbWidgetBase(*new HbIconItemPrivate(QString()), parent)
{
    Q_D(HbIconItem);
    d->q_ptr = this;
    // Set this graphics item to be updated on icon animations
    d->mAnimator.setGraphicsItem(this);
    HbOogmWatcher::instance()->registerIconItem(this);
}


/*!
 \internal
 */
HbIconItem::HbIconItem(HbIconItemPrivate &dd, QGraphicsItem *parent) :
    HbWidgetBase(dd, parent)
{
    // Set this graphics item to be updated on icon animations
    dd.mAnimator.setGraphicsItem(this);
    HbOogmWatcher::instance()->registerIconItem(this);
}

/*!
 Destructor.
 */
HbIconItem::~HbIconItem()
{
    HbOogmWatcher *w = HbOogmWatcher::instance();
    if (w) {
        w->unregisterIconItem(this);
    }
}

/*!
 \return the HbIcon associated with this HbIconItem instance.

 \sa setIcon
 */
HbIcon HbIconItem::icon() const
{
    Q_D(const HbIconItem);
    return d->mIcon;
}

/*!
 Sets the HbIcon instance associated with this HbIconItem.

 Calling any function on \a icon after this one may not have any effect on the
 icon displayed by the HbIconItem. Use the setters in HbIconItem instead. Of course
 the settings set on \a icon before calling setIcon() will all be taken into account.

 The icon-specific parameters (flags, color, mirroring mode) set via the HbIconItem
 setters before are lost as this function causes the entire underlying icon to be
 replaced with a new one.
 
 \param icon the HbIcon instance that this HbIconItem displays.

 \sa icon()
*/
void HbIconItem::setIcon(const HbIcon &icon, bool reserved)
{
    Q_UNUSED(reserved);
    Q_D(HbIconItem);
    if (d->mIcon != icon) {
        d->mIcon = icon;
        d->updateIconItem();
    }
}

/*!
 Sets the size for icon.
 This function needs to be called only when image item
 is not added in layout. If its added to layout then layout
 will decide the position and size which will then be set
 in setGeometry() function.

 This is a convenience function for setGeometry(QRectF(pos(), size))

 \sa HbIcon::setSize(), HbIconItem::defaultSize()
 */
void HbIconItem::setSize(const QSizeF &size)
{
    setGeometry(QRectF(pos(), size));
}

/*!
 Sets the alignment for the icon.

 By default no aligning is used.

 \param alignment the new icon alignment

 \sa alignment
 */
void HbIconItem::setAlignment(Qt::Alignment alignment)
{
    Q_D(HbIconItem);
    d->setApiProtectionFlag(HbWidgetBasePrivate::AC_IconAlign, true);
    alignment = d->combineAlignment(alignment, d->mAlignment);
    if (d->mAlignment != alignment) {
        d->mAlignment = alignment;
        update();
    }
}

/*!
 Sets the aspect ratio mode for the icon.

 It defaults to Qt::KeepAspectRatio.

 \param aspectRatio the new icon aspect ratio.

 \sa aspectRatioMode
 */
void HbIconItem::setAspectRatioMode(Qt::AspectRatioMode aspectRatioMode)
{
    Q_D(HbIconItem);
    d->setApiProtectionFlag(HbWidgetBasePrivate::AC_IconAspectRatioMode, true);
    if (d->mAspectRatioMode != aspectRatioMode) {
        d->mAspectRatioMode = aspectRatioMode;
        update();
    }
}

/*!
 Sets the QIcon mode for the icon. An icon can show different images for different modes.
 If this method is not called, the icon uses the default mode which is QIcon::Normal.

 \param mode the new icon mode.
 \warning Currently this method makes use of pixmap() routine in case of NVG icons.
 pixmap() slows down the hardware accelerated rendering.
 \sa mode
 */
void HbIconItem::setMode(QIcon::Mode mode)
{
    Q_D(HbIconItem);
    if (d->mMode != mode) {
        d->mMode = mode;
        update();
    }
}

/*!
 Sets the QIcon state for the icon Item. An icon can show different images for different modes.
 If this method is not called, the icon uses its default state which is QIcon::Off.

 \param state the new icon state.

 \sa state
 */
void HbIconItem::setState(QIcon::State state)
{
    Q_D(HbIconItem);
    if (d->mState != state) {
        d->mState = state;
        update();
    }
}

/*!
 Sets the new icon name for HbIconItem. If iconName is already set in
 HbIconItem then it will be replaced with this new iconName.
 \param iconName the new icon name.

 \sa HbIcon::setIconName()
 \sa iconName
 */
void HbIconItem::setIconName(const QString &iconName)
{
    Q_D(HbIconItem);
    if (d->mIcon.iconName() != iconName) {
        d->mIcon.setIconName(iconName);
        d->updateIconItem();
    }
}

/*!
 Sets the icon \a flags for the icon item.
 \param flags new icon flags.

 \sa HbIcon::setFlags()
 \sa flags
 */
void HbIconItem::setFlags(HbIcon::Flags flags)
{
    Q_D(HbIconItem);
    if (d->mIcon.flags() != flags) {
        d->mIcon.setFlags(flags);
        d->updateIconParams();
    }
}

/*!
 Sets the mirroring \a mode for the icon item.
 Mirroring mode controls how to icon is displayed in right to left layouts.
 \param mode the new mirroring mode.

 \sa HbIcon::setMirroringMode()
 \sa mirroringMode
 */
void HbIconItem::setMirroringMode(HbIcon::MirroringMode mode)
{
    Q_D(HbIconItem);
    if (d->mIcon.mirroringMode() != mode) {
        d->mIcon.setMirroringMode(mode);
        d->updateIconParams();
    }
}

/*!
 Sets the \a brush for the icon item.
 The brush defines a fill pattern that is used to paint the icon.
 \param brush the brush to be used to paint this icon.
 \sa brush
*/
void HbIconItem::setBrush(const QBrush &brush)
{
    Q_D(HbIconItem);
    d->setApiProtectionFlag(HbWidgetBasePrivate::AC_IconBrush, true);
    if (d->mBrush != brush) {
        d->mBrush = brush;
        update();
    }
}

/*!
    Enables or disables icon scaling.

    By default the setting is true, i.e. scaling is enabled.
   
    When enabled, the size of the icon will be set to match
    the item's size, so scaling may occur (by taking the aspect
    ratio setting into account).

    Scaling should only be disabled when the icon item is used
    with raster graphics, for which upscaling is not desired.
    
    When disabled, the size of the icon will be the default size
    of its source, i.e. in case of raster graphics the original dimensions
    of the image. It is recommended to set the center alignment too in this case.
    The size of the icon item is not affected, the content will just not cover the
    entire area. Note however that when the icon's default size is bigger than the
    size of the item displaying it then downscaling will still occur.
    
    \sa iconScaling
*/
void HbIconItem::setIconScaling(bool enabled)
{
    Q_D(HbIconItem);
    if (d->mIconScalingEnabled != enabled) {
        d->mIconScalingEnabled = enabled;
        d->updateIconItem();
    }
}

/*!
  This function can be used to enable asynchronous icon data retrieval.

  It has no effect if called after the first paint so it needs to be called
  immediately after creating the HbIconItem instance.

  While the data is not available empty content will be painted.

  \sa async
 */
void HbIconItem::setAsync(bool async)
{
    Q_D(HbIconItem);
    if (d->mAsync != async) {
        d->mAsync = async;
        d->updateIconItem();
    }
}

/*!
 Sets the new icon name for this HbIconItem for \a mode and \a state. If iconName is already set in
 HbIconItem then it will be replaced with this new iconName.
 \param  iconName the icon name.
 \param  mode  mode of the  icon.
 \param  state state of the icon.

 \sa HbIcon::setIconName()
 \sa iconName
 */
void HbIconItem::setIconName(const QString &iconName, QIcon::Mode mode, QIcon::State state)
{
    Q_D(HbIconItem);
    d->mIcon.setIconName(iconName, mode, state);
    d->updateIconItem();
}

/*!
  Sets the new icon color for the HbIconItem. Note that the color
  is just stored but not actually used if the HbIcon::Colorized flag
  is not set and the icon is not a mono icon from the theme.

  See HbIcon::setColor() for more information on colorization of mono
  icons in widgets.

  \param  color to be set.
  \sa HbIconItem::color(), HbIcon::setColor()
*/
void HbIconItem::setColor(const QColor &color)
{
    Q_D(HbIconItem);
    if (d->mIcon.color() != color) {
        d->mIcon.setColor(color);
        d->updateIconParams();
    }
}

/*!
* Returns the color of the HbIconItem.
* \sa HbIconItem::setColor()
*/
QColor HbIconItem::color() const
{
    Q_D(const  HbIconItem);
    return d->mIcon.color();
}

/*!
 Returns the default size of the icon.

 For raster images this is the original size of the image.

 \sa HbIcon::defaultSize()
 */
QSizeF HbIconItem::defaultSize() const
{
    Q_D(const HbIconItem);
    return d->mIcon.defaultSize();
}

/*!
 \return the size of this HbIconItem
 \sa HbIcon::size()
 \sa HbIconItem::defaultSize()
 */
QSizeF HbIconItem::iconItemSize() const
{
    return boundingRect().size();
}

/*!
 \return the icon's aspect ratio.

 \sa setAspectRatioMode
 */
Qt::AspectRatioMode HbIconItem::aspectRatioMode() const
{
    Q_D(const HbIconItem);
    return d->mAspectRatioMode;
}

/*!
 \return the icon's alignment.

 \sa setAlignment
 */
Qt::Alignment HbIconItem::alignment() const
{
    Q_D(const HbIconItem);
    return d->mAlignment;
}

/*!
 \return the icon's mode.

 \sa setMode
 */
QIcon::Mode HbIconItem::mode() const
{
    Q_D(const HbIconItem);
    return d->mMode;
}

/*!
 \return the icon's state.

 \sa setState
 */
QIcon::State HbIconItem::state() const
{
    Q_D(const HbIconItem);
    return d->mState;
}

/*!
 \return the icon's name.

 \sa HbIcon::iconName()
 \sa setIconName
 */
QString HbIconItem::iconName() const
{
    Q_D(const HbIconItem);
    return d->mIcon.iconName();
}

/*!
 \return the icon name for a specific mode and state.
 \param mode the mode of the icon.
 \param state the state of the icon.

 \sa HbIcon::iconName()
 \sa setIconName
 */
QString HbIconItem::iconName(QIcon::Mode mode, QIcon::State state) const
{
    Q_D(const HbIconItem);
    return d->mIcon.iconName(mode, state);
}

/*!
 \return the HbIcon flags for the icon displayed by this HbIconItem.

 \sa HbIcon::flags()
 \sa setFlags
 */
HbIcon::Flags HbIconItem::flags() const
{
    Q_D(const HbIconItem);
    return d->mIcon.flags();
}

/*!
 \return the icon's mirroring mode.

 \sa HbIcon::mirroringMode()
 \sa setMirroringMode
 */
HbIcon::MirroringMode HbIconItem::mirroringMode() const
{
    Q_D(const HbIconItem);
    return d->mIcon.mirroringMode();
}

/*!
 \return the brush for this HbIconItem, or an empty brush if no brush has been set.

 \sa setBrush
 */
QBrush HbIconItem::brush() const
{
    Q_D(const HbIconItem);
    return d->mBrush;
}

/*!
  \return the current setting for icon scaling. By default it is true (i.e. enabled).
  
  \sa setIconScaling
 */
bool HbIconItem::iconScaling() const
{
    Q_D(const HbIconItem);
    return d->mIconScalingEnabled;
}

/*!
  \return the current setting for asynchronous icon data retrieval.
  By default the value is false (i.e. disabled).

  \sa setAsync
 */
bool HbIconItem::async() const
{
    Q_D(const HbIconItem);
    return d->mAsync;
}

/*!
 * Refer HbIcon::isNull()
 */
bool HbIconItem::isNull() const
{
    Q_D(const HbIconItem);
    return d->mIcon.isNull();
}

/*!
 Paints the graphics item.
 \note Parameters \a option and \a widget are unused.
 \reimp
 */
void HbIconItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    Q_UNUSED(widget)
    Q_UNUSED(option)
    Q_D(HbIconItem);

    if (d->mIcon.isNull() && d->mBrush == Qt::NoBrush) {
        return;
    }

    if (d->mClearCachedRect){
        d->recalculateBoundingRect();
    }

    if (!d->mBoundingRect.isEmpty()){
        if (d->mIconRect != d->mBoundingRect) {
            d->mIconRect = d->mBoundingRect;
            if (!d->mIcon.isNull()) {
                HbIconPrivate *p = HbIconPrivate::d_ptr_detached(&d->mIcon);
                p->setThemedColor(d->mThemedColor);
                p->setAsync(d->mAsync, asyncReady, this);
            }
            d->mIcon.setSize(d->mIconScalingEnabled ? d->mIconRect.size() : d->mIcon.defaultSize());
            d->mAnimator.setIcon(d->mIcon);
        }
        if (d->mBrush != Qt::NoBrush) {
            painter->fillRect(d->mBoundingRect, d->mBrush);
        }
        d->mAnimator.paint(painter, d->mBoundingRect,
                           d->mAspectRatioMode, d->mAlignment,
                           d->mMode, d->mState);
    }

    if (HbIconItemPrivate::outlinesEnabled) {
        painter->setBrush(QBrush(QColor(0, 255, 0, 50)));
        painter->drawRect(contentsRect());
    }
}

/*!
 \reimp
 */
QRectF HbIconItem::boundingRect() const

{
    Q_D(const HbIconItem);
    if (d->mClearCachedRect) {
        d->recalculateBoundingRect();
    }
    return d->mBoundingRect;
}

/*!
 \reimp
 */
void HbIconItem::setGeometry(const QRectF& rect)
{
    Q_D(HbIconItem);
    d->mClearCachedRect = true;
    HbWidgetBase::setGeometry(rect);
}

/*!
    \reimp
 */
void HbIconItem::changeEvent(QEvent *event)
{
    switch (event->type()) {
        // suppress events (optimize)
    case QEvent::FontChange:
    case QEvent::PaletteChange:
    case QEvent::ParentChange:
        break;
    case QEvent::StyleChange: // flow through
    default:
        HbWidgetBase::changeEvent(event);
        break;
    }
}

/*!
   \reimp
*/
QVariant HbIconItem::itemChange(GraphicsItemChange change, const QVariant &value)
{
    Q_D(HbIconItem);
    if (change == QGraphicsItem::ItemEnabledHasChanged) {
        d->mMode = value.toBool() ? QIcon::Normal : QIcon::Disabled;
    } else if (change == QGraphicsItem::ItemVisibleHasChanged) {
        if (!value.toBool() && HbInstancePrivate::d_ptr()->mDropHiddenIconData) {
            d->clearStoredIconContent();
        }
    }

    return HbWidgetBase::itemChange(change, value);
}

/*!
 Returns the icon animator object of the icon item.

 If the icon is not animated, the animator does not do anything.
 For more information about icon animations, see also class HbIcon.
*/
HbIconAnimator &HbIconItem::animator()
{
    Q_D(HbIconItem);
    return d->mAnimator;
}

// end of file