src/hbcore/primitives/hbtoucharea.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 19 Apr 2010 14:02:13 +0300
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/****************************************************************************
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**
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** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (developer.feedback@nokia.com)
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**
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** This file is part of the HbCore module of the UI Extensions for Mobile.
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**
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this file.
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** Please review the following information to ensure the GNU Lesser General
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** Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at developer.feedback@nokia.com.
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**
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****************************************************************************/
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#include "hbtoucharea.h"
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#include "hbtoucharea_p.h"
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#include <QStyleOptionGraphicsItem>
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#include <QGraphicsLayout>
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#include <QPainter>
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#include <hbmainwindow.h>
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#include <hbinstance.h>
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#include <qgraphicsscene.h>
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bool HbTouchAreaPrivate::outlinesEnabled = false;
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/*!
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 \class HbTouchArea
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 \brief HbTouchArea handles invisible touch area for widgets.
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 @beta
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 */
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HbTouchAreaPrivate::HbTouchAreaPrivate() : q_ptr(0)
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{
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}
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HbTouchAreaPrivate::~HbTouchAreaPrivate()
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{
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}
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bool HbTouchAreaPrivate::outlineDrawingEnabled()
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{
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    return HbTouchAreaPrivate::outlinesEnabled;
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}
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void HbTouchAreaPrivate::setOutlineDrawing(bool enabled)
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{
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    HbTouchAreaPrivate::outlinesEnabled = enabled;
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    // Because this method is static we need to toggle QGraphicsItem::ItemHasNoContents flag 
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    // value hard way. This is RnD feature anyway.
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    foreach (HbMainWindow *window, hbInstance->allMainWindows()) {
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        QGraphicsScene *scene = static_cast<QGraphicsScene*>(window->scene());
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        foreach( QGraphicsItem *item, scene->items() ) {
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            if (HbTouchArea *widget = qgraphicsitem_cast<HbTouchArea *>(item)) {
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                widget->setFlag(QGraphicsItem::ItemHasNoContents, !enabled);
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            }
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        }
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    }
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}
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/*!
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 Constructs a new HbTouchArea.
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 */
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HbTouchArea::HbTouchArea(QGraphicsItem *parent) :
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    HbWidgetBase(*new HbTouchAreaPrivate(), parent)
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{
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    Q_D(HbTouchArea);
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    d->q_ptr = this;
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    setFlag(QGraphicsItem::ItemHasNoContents, !HbTouchAreaPrivate::outlinesEnabled);
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}
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/*!
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 \internal
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 */
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HbTouchArea::HbTouchArea(HbTouchAreaPrivate &dd, QGraphicsItem *parent) :
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    HbWidgetBase(dd, parent)
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{
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    setFlag(QGraphicsItem::ItemHasNoContents, !HbTouchAreaPrivate::outlinesEnabled);
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}
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/*!
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 Destructs the graphics item.
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 */
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HbTouchArea::~HbTouchArea()
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{
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}
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/*!
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 Sets the size for the touch area. Without calling this method,
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 the touch area uses its default size.
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 This function needs to be called only when item
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 is not added in layout. If its added to layout then layout
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 will decide the position and size which will then be set
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 in setGeometry() function.
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 This is a convenience function for setGeometry(QRectF(pos(), size))
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 */
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void HbTouchArea::setSize(const QSizeF &size)
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{
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    setGeometry(QRectF(pos(), size));
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}
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/*!
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 Paints the graphics item. When used in a release environment this will do
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 nothing; when used internally AND the draw boxes flag is set (by calling 
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 HbTouchArea::setDrawBoxes(true), a translucent box will be drawn indicating
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 the active touch area.
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 \note Currently option and widget parameters are unused
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 \reimp
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 */
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void HbTouchArea::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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    Q_UNUSED(widget)
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    Q_UNUSED(option)
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    HbWidgetBase::paint(painter, option, widget);
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    // The paint method is called only if HbTouchAreaPrivate::outlinesEnabled is true (RnD feature)
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    // because flag QGraphicsItem::ItemHasNoContents is set otherwise.
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    if (HbTouchAreaPrivate::outlinesEnabled) {
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        painter->setPen(Qt::red);
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        painter->drawLine(contentsRect().topLeft(), contentsRect().bottomRight());
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        painter->drawLine(contentsRect().topRight(), contentsRect().bottomLeft()); 
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        painter->setBrush(QBrush(QColor(255, 0, 0, 50)));
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        painter->drawRect(contentsRect());
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    }
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}
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/*!
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    Virtual function from QGraphicsLayoutItem.
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    Sets the new position and size of HbTouchArea.
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 */
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void HbTouchArea::setGeometry(const QRectF &rect)
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{
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    HbWidgetBase::setGeometry(rect);
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}
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/*!
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 Virtual function from QGraphicsLayoutItem.
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 */
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void HbTouchArea::updateGeometry()
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{
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    // call the base class updateGeometry
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    HbWidgetBase::updateGeometry();
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}
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/*!
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 Virtual function from QGraphicsLayoutItem.
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 Returns the size based upon the size hint(minimum, maximum and preferred) passed.
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 The minimum size is QSizeF(0, 0);
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 The maximum size is QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
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 The preferred size is defaultSize() of the image.
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 */
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QSizeF HbTouchArea::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
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{
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    Q_UNUSED(constraint);
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    if (which == Qt::MinimumSize) {
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        return QSizeF(0, 0);
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    } else if (which == Qt::MaximumSize) {
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        return QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
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    } else {
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        // Touch area should not enforce a size
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		return QSizeF(0, 0);
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    }
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}
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// end of file