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

**

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

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtGui module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, 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 qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

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

#include "qbitmap.h"

#include "qevent.h"

#include "qstylepainter.h"

#include "qrubberband.h"

#include "qtimer.h"

#ifndef QT_NO_RUBBERBAND

#include "qstyle.h"

#include "qstyleoption.h"

#ifdef Q_WS_MAC

#  include <private/qt_mac_p.h>

#  include <private/qt_cocoa_helpers_mac_p.h>

#endif

#include <qdebug.h>

#include <private/qwidget_p.h>

QT_BEGIN_NAMESPACE

//### a rubberband window type would be a more elegant solution

#define RUBBERBAND_WINDOW_TYPE Qt::ToolTip

class QRubberBandPrivate : public QWidgetPrivate

{

    Q_DECLARE_PUBLIC(QRubberBand)

public:

    QRect rect;

    QRubberBand::Shape shape;

    QRegion clipping;

    void updateMask();

};

/*!

    Initialize \a option with the values from this QRubberBand. This method

    is useful for subclasses when they need a QStyleOptionRubberBand, but don't want

    to fill in all the information themselves.

    \sa QStyleOption::initFrom()

*/

void QRubberBand::initStyleOption(QStyleOptionRubberBand *option) const

{

    if (!option)

        return;

    option->initFrom(this);

    option->shape = d_func()->shape;

#ifndef Q_WS_MAC

    option->opaque = true;

#else

    option->opaque = windowFlags() & RUBBERBAND_WINDOW_TYPE;

#endif

}

/*!

    \class QRubberBand

    \brief The QRubberBand class provides a rectangle or line that can

    indicate a selection or a boundary.

    A rubber band is often used to show a new bounding area (as in a

    QSplitter or a QDockWidget that is undocking). Historically this has

    been implemented using a QPainter and XOR, but this approach

    doesn't always work properly since rendering can happen in the

    window below the rubber band, but before the rubber band has been

    "erased".

    You can create a QRubberBand whenever you need to render a rubber band

    around a given area (or to represent a single line), then call

    setGeometry(), move() or resize() to position and size it. A common

    pattern is to do this in conjunction with mouse events. For example:

    \snippet doc/src/snippets/code/src_gui_widgets_qrubberband.cpp 0

    If you pass a parent to QRubberBand's constructor, the rubber band will

    display only inside its parent, but stays on top of other child widgets.

    If no parent is passed, QRubberBand will act as a top-level widget.

    Call show() to make the rubber band visible; also when the

    rubber band is not a top-level. Hiding or destroying

    the widget will make the rubber band disappear. The rubber band

    can be a \l Rectangle or a \l Line (vertical or horizontal),

    depending on the shape() it was given when constructed.

*/

// ### DOC: How about some nice convenience constructors?

//QRubberBand::QRubberBand(QRubberBand::Type t, const QRect &rect, QWidget *p)

//QRubberBand::QRubberBand(QRubberBand::Type t, int x, int y, int w, int h, QWidget *p)

/*!

    Constructs a rubber band of shape \a s, with parent \a p.

    By default a rectangular rubber band (\a s is \c Rectangle) will

    use a mask, so that a small border of the rectangle is all

    that is visible. Some styles (e.g., native Mac OS X) will

    change this and call QWidget::setWindowOpacity() to make a

    semi-transparent filled selection rectangle.

*/

QRubberBand::QRubberBand(Shape s, QWidget *p)

    : QWidget(*new QRubberBandPrivate, p, (p && p->windowType() != Qt::Desktop) ? Qt::Widget : RUBBERBAND_WINDOW_TYPE)

{

    Q_D(QRubberBand);

    d->shape = s;

    setAttribute(Qt::WA_TransparentForMouseEvents);

#ifndef Q_WS_WIN

    setAttribute(Qt::WA_NoSystemBackground);

#endif //Q_WS_WIN

    setAttribute(Qt::WA_WState_ExplicitShowHide);

    setVisible(false);

#ifdef Q_WS_MAC

    if (isWindow()) {

        createWinId();

        extern OSWindowRef qt_mac_window_for(const QWidget *); //qwidget_mac.cpp

        macWindowSetHasShadow(qt_mac_window_for(this), false);

    }

#endif

}

/*!

    Destructor.

*/

QRubberBand::~QRubberBand()

{

}

/*!

    \enum QRubberBand::Shape

    This enum specifies what shape a QRubberBand should have. This is

    a drawing hint that is passed down to the style system, and can be

    interpreted by each QStyle.

    \value Line A QRubberBand can represent a vertical or horizontal

                line. Geometry is still given in rect() and the line

                will fill the given geometry on most styles.

    \value Rectangle A QRubberBand can represent a rectangle. Some

                     styles will interpret this as a filled (often

                     semi-transparent) rectangle, or a rectangular

                     outline.

*/

/*!

  Returns the shape of this rubber band. The shape can only be set

  upon construction.

*/

QRubberBand::Shape QRubberBand::shape() const

{

    Q_D(const QRubberBand);

    return d->shape;

}

/*!

    \internal

*/

void QRubberBandPrivate::updateMask()

{

    Q_Q(QRubberBand);

    QStyleHintReturnMask mask;

    QStyleOptionRubberBand opt;

    q->initStyleOption(&opt);

    if (q->style()->styleHint(QStyle::SH_RubberBand_Mask, &opt, q, &mask)) {

        q->setMask(mask.region);

    } else {

        q->clearMask();

    }

}

/*!

    \reimp

*/

void QRubberBand::paintEvent(QPaintEvent *)

{

    QStylePainter painter(this);

    QStyleOptionRubberBand option;

    initStyleOption(&option);

    painter.drawControl(QStyle::CE_RubberBand, option);

}

/*!

    \reimp

*/

void QRubberBand::changeEvent(QEvent *e)

{

    QWidget::changeEvent(e);

    switch (e->type()) {

    case QEvent::ParentChange:

        if (parent()) {

            setWindowFlags(windowFlags() & ~RUBBERBAND_WINDOW_TYPE);

        } else {

            setWindowFlags(windowFlags() | RUBBERBAND_WINDOW_TYPE);

        }

        break;

    default:

        break;

    }

    if (e->type() == QEvent::ZOrderChange)

        raise();

}

/*!

    \reimp

*/

void QRubberBand::showEvent(QShowEvent *e)

{

    raise();

    e->ignore();

}

/*!

    \reimp

*/

void QRubberBand::resizeEvent(QResizeEvent *)

{

    Q_D(QRubberBand);

    d->updateMask();

}

/*!

    \reimp

*/

void QRubberBand::moveEvent(QMoveEvent *)

{

    Q_D(QRubberBand);

    d->updateMask();

}

/*!

    \fn void QRubberBand::move(const QPoint &p);

    \overload

    Moves the rubberband to point \a p.

    \sa resize()

*/

/*!

    \fn void QRubberBand::move(int x, int y);

    Moves the rubberband to point (\a x, \a y).

    \sa resize()

*/

/*!

    \fn void QRubberBand::resize(const QSize &size);

    \overload

    Resizes the rubberband so that its new size is \a size.

    \sa move()

*/

/*!

    \fn void QRubberBand::resize(int width, int height);

    Resizes the rubberband so that its width is \a width, and its

    height is \a height.

    \sa move()

*/

/*!

    \fn void QRubberBand::setGeometry(const QRect &rect)

    Sets the geometry of the rubber band to \a rect, specified in the coordinate system

    of its parent widget.

    \sa QWidget::geometry

*/

void QRubberBand::setGeometry(const QRect &geom)

{

    QWidget::setGeometry(geom);

}

/*!

    \fn void QRubberBand::setGeometry(int x, int y, int width, int height)

    \overload

    Sets the geometry of the rubberband to the rectangle whose top-left corner lies at

    the point (\a x, \a y), and with dimensions specified by \a width and \a height.

    The geometry is specified in the parent widget's coordinate system.

*/

/*! \reimp */

bool QRubberBand::event(QEvent *e)

{

    return QWidget::event(e);

}

QT_END_NAMESPACE

#endif // QT_NO_RUBBERBAND