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

**

** 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 <qapplication.h>

#include "qabstractslider.h"

#include "qevent.h"

#include "qabstractslider_p.h"

#include "qdebug.h"

#ifndef QT_NO_ACCESSIBILITY

#include "qaccessible.h"

#endif

#include <limits.h>

QT_BEGIN_NAMESPACE

/*!

    \class QAbstractSlider

    \brief The QAbstractSlider class provides an integer value within a range.

    \ingroup abstractwidgets

    The class is designed as a common super class for widgets like

    QScrollBar, QSlider and QDial.

    Here are the main properties of the class:

    \list 1

    \i \l value: The bounded integer that QAbstractSlider maintains.

    \i \l minimum: The lowest possible value.

    \i \l maximum: The highest possible value.

    \i \l singleStep: The smaller of two natural steps that an

    abstract sliders provides and typically corresponds to the user

    pressing an arrow key.

    \i \l pageStep: The larger of two natural steps that an abstract

    slider provides and typically corresponds to the user pressing

    PageUp or PageDown.

    \i \l tracking: Whether slider tracking is enabled.

    \i \l sliderPosition: The current position of the slider. If \l

    tracking is enabled (the default), this is identical to \l value.

    \endlist

    Unity (1) may be viewed as a third step size. setValue() lets you

    set the current value to any integer in the allowed range, not

    just minimum() + \e n * singleStep() for integer values of \e n.

    Some widgets may allow the user to set any value at all; others

    may just provide multiples of singleStep() or pageStep().

    QAbstractSlider emits a comprehensive set of signals:

    \table

    \header \i Signal \i Emitted when

    \row \i \l valueChanged()

         \i the value has changed. The \l tracking

            determines whether this signal is emitted during user

            interaction.

    \row \i \l sliderPressed()

         \i the user starts to drag the slider.

    \row \i \l sliderMoved()

         \i the user drags the slider.

    \row \i \l sliderReleased()

         \i the user releases the slider.

    \row \i \l actionTriggered()

         \i a slider action was triggerd.

    \row \i \l rangeChanged()

         \i a the range has changed.

    \endtable

    QAbstractSlider provides a virtual sliderChange() function that is

    well suited for updating the on-screen representation of

    sliders. By calling triggerAction(), subclasses trigger slider

    actions. Two helper functions QStyle::sliderPositionFromValue() and

    QStyle::sliderValueFromPosition() help subclasses and styles to map

    screen coordinates to logical range values.

    \sa QAbstractSpinBox, QSlider, QDial, QScrollBar, {Sliders Example}

*/

/*!

    \enum QAbstractSlider::SliderAction

    \value SliderNoAction

    \value SliderSingleStepAdd

    \value SliderSingleStepSub

    \value SliderPageStepAdd

    \value SliderPageStepSub

    \value SliderToMinimum

    \value SliderToMaximum

    \value SliderMove

*/

/*!

    \fn void QAbstractSlider::valueChanged(int value)

    This signal is emitted when the slider value has changed, with the

    new slider \a value as argument.

*/

/*!

    \fn void QAbstractSlider::sliderPressed()

    This signal is emitted when the user presses the slider with the

    mouse, or programmatically when setSliderDown(true) is called.

    \sa sliderReleased(), sliderMoved(), isSliderDown()

*/

/*!

    \fn void QAbstractSlider::sliderMoved(int value)

    This signal is emitted when sliderDown is true and the slider moves. This

    usually happens when the user is dragging the slider. The \a value

    is the new slider position.

    This signal is emitted even when tracking is turned off.

    \sa setTracking(), valueChanged(), isSliderDown(),

    sliderPressed(), sliderReleased()

*/

/*!

    \fn void QAbstractSlider::sliderReleased()

    This signal is emitted when the user releases the slider with the

    mouse, or programmatically when setSliderDown(false) is called.

    \sa sliderPressed() sliderMoved() sliderDown

*/

/*!

    \fn void QAbstractSlider::rangeChanged(int min, int max)

    This signal is emitted when the slider range has changed, with \a

    min being the new minimum, and \a max being the new maximum.

    \sa minimum, maximum

*/

/*!

    \fn void QAbstractSlider::actionTriggered(int action)

    This signal is emitted when the slider action \a action is

    triggered. Actions are \l SliderSingleStepAdd, \l

    SliderSingleStepSub, \l SliderPageStepAdd, \l SliderPageStepSub,

    \l SliderToMinimum, \l SliderToMaximum, and \l SliderMove.

    When the signal is emitted, the \l sliderPosition has been

    adjusted according to the action, but the \l value has not yet

    been propagated (meaning the valueChanged() signal was not yet

    emitted), and the visual display has not been updated. In slots

    connected to this signal you can thus safely adjust any action by

    calling setSliderPosition() yourself, based on both the action and

    the slider's value.

    \sa triggerAction()

*/

/*!

    \enum QAbstractSlider::SliderChange

    \value SliderRangeChange

    \value SliderOrientationChange

    \value SliderStepsChange

    \value SliderValueChange

*/

QAbstractSliderPrivate::QAbstractSliderPrivate()

    : minimum(0), maximum(99), pageStep(10), value(0), position(0), pressValue(-1),

      singleStep(1), offset_accumulated(0), tracking(true),

      blocktracking(false), pressed(false),

      invertedAppearance(false), invertedControls(false),

      orientation(Qt::Horizontal), repeatAction(QAbstractSlider::SliderNoAction)

#ifdef QT_KEYPAD_NAVIGATION

      , isAutoRepeating(false)

      , repeatMultiplier(1)

{

    firstRepeat.invalidate();

#else

{

#endif

}

QAbstractSliderPrivate::~QAbstractSliderPrivate()

{

}

/*!

    Sets the slider's minimum to \a min and its maximum to \a max.

    If \a max is smaller than \a min, \a min becomes the only legal

    value.

    \sa minimum maximum

*/

void QAbstractSlider::setRange(int min, int max)

{

    Q_D(QAbstractSlider);

    int oldMin = d->minimum;

    int oldMax = d->maximum;

    d->minimum = min;

    d->maximum = qMax(min, max);

    if (oldMin != d->minimum || oldMax != d->maximum) {

        sliderChange(SliderRangeChange);

        emit rangeChanged(d->minimum, d->maximum);

        setValue(d->value); // re-bound

    }

}

void QAbstractSliderPrivate::setSteps(int single, int page)

{

    Q_Q(QAbstractSlider);

    singleStep = qAbs(single);

    pageStep = qAbs(page);

    q->sliderChange(QAbstractSlider::SliderStepsChange);

}

/*!

    Constructs an abstract slider.

    The \a parent arguments is sent to the QWidget constructor.

    The \l minimum defaults to 0, the \l maximum to 99, with a \l

    singleStep size of 1 and a \l pageStep size of 10, and an initial

    \l value of 0.

*/

QAbstractSlider::QAbstractSlider(QWidget *parent)

    :QWidget(*new QAbstractSliderPrivate, parent, 0)

{

}

/*! \internal */

QAbstractSlider::QAbstractSlider(QAbstractSliderPrivate &dd, QWidget *parent)

    :QWidget(dd, parent, 0)

{

}

/*!

    Destroys the slider.

*/

QAbstractSlider::~QAbstractSlider()

{

}

/*!

    \property QAbstractSlider::orientation

    \brief the orientation of the slider

    The orientation must be \l Qt::Vertical (the default) or \l

    Qt::Horizontal.

*/

void QAbstractSlider::setOrientation(Qt::Orientation orientation)

{

    Q_D(QAbstractSlider);

    if (d->orientation == orientation)

        return;

    d->orientation = orientation;

    if (!testAttribute(Qt::WA_WState_OwnSizePolicy)) {

        QSizePolicy sp = sizePolicy();

        sp.transpose();

        setSizePolicy(sp);

        setAttribute(Qt::WA_WState_OwnSizePolicy, false);

    }

    update();

    updateGeometry();

}

Qt::Orientation QAbstractSlider::orientation() const

{

    Q_D(const QAbstractSlider);

    return d->orientation;

}

/*!

    \property QAbstractSlider::minimum

    \brief the sliders's minimum value

    When setting this property, the \l maximum is adjusted if

    necessary to ensure that the range remains valid. Also the

    slider's current value is adjusted to be within the new range.

*/

void QAbstractSlider::setMinimum(int min)

{

    Q_D(QAbstractSlider);

    setRange(min, qMax(d->maximum, min));

}

int QAbstractSlider::minimum() const

{

    Q_D(const QAbstractSlider);

    return d->minimum;

}

/*!

    \property QAbstractSlider::maximum

    \brief the slider's maximum value

    When setting this property, the \l minimum is adjusted if

    necessary to ensure that the range remains valid.  Also the

    slider's current value is adjusted to be within the new range.

*/

void QAbstractSlider::setMaximum(int max)

{

    Q_D(QAbstractSlider);

    setRange(qMin(d->minimum, max), max);

}

int QAbstractSlider::maximum() const

{

    Q_D(const QAbstractSlider);

    return d->maximum;

}

/*!

    \property QAbstractSlider::singleStep

    \brief the single step.

    The smaller of two natural steps that an

    abstract sliders provides and typically corresponds to the user

    pressing an arrow key.

    If the property is modified during an auto repeating key event, behavior

    is undefined.

    \sa pageStep

*/

void QAbstractSlider::setSingleStep(int step)

{

    Q_D(QAbstractSlider);

    if (step != d->singleStep)

        d->setSteps(step, d->pageStep);

}

int QAbstractSlider::singleStep() const

{

    Q_D(const QAbstractSlider);

    return d->singleStep;

}

/*!

    \property QAbstractSlider::pageStep

    \brief the page step.

    The larger of two natural steps that an abstract slider provides

    and typically corresponds to the user pressing PageUp or PageDown.

    \sa singleStep

*/

void QAbstractSlider::setPageStep(int step)

{

    Q_D(QAbstractSlider);

    if (step != d->pageStep)

        d->setSteps(d->singleStep, step);

}

int QAbstractSlider::pageStep() const

{

    Q_D(const QAbstractSlider);

    return d->pageStep;

}

/*!

    \property QAbstractSlider::tracking

    \brief whether slider tracking is enabled

    If tracking is enabled (the default), the slider emits the

    valueChanged() signal while the slider is being dragged. If

    tracking is disabled, the slider emits the valueChanged() signal

    only when the user releases the slider.

    \sa sliderDown

*/

void QAbstractSlider::setTracking(bool enable)

{

    Q_D(QAbstractSlider);

    d->tracking = enable;

}

bool QAbstractSlider::hasTracking() const

{

    Q_D(const QAbstractSlider);

    return d->tracking;

}

/*!

    \property QAbstractSlider::sliderDown

    \brief whether the slider is pressed down.

    The property is set by subclasses in order to let the abstract

    slider know whether or not \l tracking has any effect.

    Changing the slider down property emits the sliderPressed() and

    sliderReleased() signals.

*/

void QAbstractSlider::setSliderDown(bool down)

{

    Q_D(QAbstractSlider);

    bool doEmit = d->pressed != down;

    d->pressed = down;

    if (doEmit) {

        if (down)

            emit sliderPressed();

        else

            emit sliderReleased();

    }

    if (!down && d->position != d->value)

        triggerAction(SliderMove);

}

bool QAbstractSlider::isSliderDown() const

{

    Q_D(const QAbstractSlider);

    return d->pressed;

}

/*!

    \property QAbstractSlider::sliderPosition

    \brief the current slider position

    If \l tracking is enabled (the default), this is identical to \l value.

*/

void QAbstractSlider::setSliderPosition(int position)

{

    Q_D(QAbstractSlider);

    position = d->bound(position);

    if (position == d->position)

        return;

    d->position = position;

    if (!d->tracking)

        update();

    if (d->pressed)

        emit sliderMoved(position);

    if (d->tracking && !d->blocktracking)

        triggerAction(SliderMove);

}

int QAbstractSlider::sliderPosition() const

{

    Q_D(const QAbstractSlider);

    return d->position;

}

/*!

    \property QAbstractSlider::value

    \brief the slider's current value

    The slider forces the value to be within the legal range: \l

    minimum <= \c value <= \l maximum.

    Changing the value also changes the \l sliderPosition.

*/

int QAbstractSlider::value() const

{

    Q_D(const QAbstractSlider);

    return d->value;

}

void QAbstractSlider::setValue(int value)