/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
**     of its contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

QAbstractSliderPrivate::QAbstractSliderPrivate()
    : minimum(0), maximum(99), singleStep(1), pageStep(10),
      value(0), position(0), pressValue(-1), tracking(true), blocktracking(false), pressed(false),
      invertedAppearance(false), invertedControls(false),
      orientation(Qt::Horizontal), repeatAction(QAbstractSlider::SliderNoAction)
{
}

QAbstractSliderPrivate::~QAbstractSliderPrivate()
{
}

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);
}

AbstractSlider::QAbstractSlider(QWidget *parent)
    :QWidget(*new QAbstractSliderPrivate, parent, 0)
{
}

QAbstractSlider::QAbstractSlider(QAbstractSliderPrivate &dd, QWidget *parent)
    :QWidget(dd, parent, 0)
{
}

QAbstractSlider::~QAbstractSlider()
{
}

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;
}


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;
}


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;
}



void QAbstractSlider::setSingleStep(int step)
{
    Q_D(QAbstractSlider);
    d->setSteps(step, d->pageStep);
}

int QAbstractSlider::singleStep() const
{
    Q_D(const QAbstractSlider);
    return d->singleStep;
}


void QAbstractSlider::setPageStep(int step)
{
    Q_D(QAbstractSlider);
    d->setSteps(d->singleStep, step);
}

int QAbstractSlider::pageStep() const
{
    Q_D(const QAbstractSlider);
    return d->pageStep;
}

oid QAbstractSlider::setTracking(bool enable)
{
    Q_D(QAbstractSlider);
    d->tracking = enable;
}

bool QAbstractSlider::hasTracking() const
{
    Q_D(const QAbstractSlider);
    return d->tracking;
}



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;
}


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;
}



int QAbstractSlider::value() const
{
    Q_D(const QAbstractSlider);
    return d->value;
}

//! [0]
void QAbstractSlider::setValue(int value)
//! [0]
{
    Q_D(QAbstractSlider);
    value = d->bound(value);
    if (d->value == value && d->position == value)
        return;
    d->value = value;
    if (d->position != value) {
        d->position = value;
        if (d->pressed)
            emit sliderMoved((d->position = value));
    }
#ifndef QT_NO_ACCESSIBILITY
//! [1]
    QAccessible::updateAccessibility(this, 0, QAccessible::ValueChanged);
//! [1]
#endif
    sliderChange(SliderValueChange);
    emit valueChanged(value);
//! [2]
}
//! [2]

bool QAbstractSlider::invertedAppearance() const
{
    Q_D(const QAbstractSlider);
    return d->invertedAppearance;
}

void QAbstractSlider::setInvertedAppearance(bool invert)
{
    Q_D(QAbstractSlider);
    d->invertedAppearance = invert;
    update();
}



bool QAbstractSlider::invertedControls() const
{
    Q_D(const QAbstractSlider);
    return d->invertedControls;
}

void QAbstractSlider::setInvertedControls(bool invert)
{
    Q_D(QAbstractSlider);
    d->invertedControls = invert;
}

void QAbstractSlider::triggerAction(SliderAction action)
{
    Q_D(QAbstractSlider);
    d->blocktracking = true;
    switch (action) {
    case SliderSingleStepAdd:
        setSliderPosition(d->value + d->singleStep);
        break;
    case SliderSingleStepSub:
        setSliderPosition(d->value - d->singleStep);
        break;
    case SliderPageStepAdd:
        setSliderPosition(d->value + d->pageStep);
        break;
    case SliderPageStepSub:
        setSliderPosition(d->value - d->pageStep);
        break;
    case SliderToMinimum:
        setSliderPosition(d->minimum);
        break;
    case SliderToMaximum:
        setSliderPosition(d->maximum);
        break;
    case SliderMove:
    case SliderNoAction:
        break;
    };
    emit actionTriggered(action);
    d->blocktracking = false;
    setValue(d->position);
}

void QAbstractSlider::setRepeatAction(SliderAction action, int thresholdTime, int repeatTime)
{
    Q_D(QAbstractSlider);
    if ((d->repeatAction = action) == SliderNoAction) {
        d->repeatActionTimer.stop();
    } else {
        d->repeatActionTime = repeatTime;
        d->repeatActionTimer.start(thresholdTime, this);
    }
}

QAbstractSlider::SliderAction QAbstractSlider::repeatAction() const
{
    Q_D(const QAbstractSlider);
    return d->repeatAction;
}

void QAbstractSlider::timerEvent(QTimerEvent *e)
{
    Q_D(QAbstractSlider);
    if (e->timerId() == d->repeatActionTimer.timerId()) {
        if (d->repeatActionTime) { // was threshold time, use repeat time next time
            d->repeatActionTimer.start(d->repeatActionTime, this);
            d->repeatActionTime = 0;
        }
        if (d->repeatAction == SliderPageStepAdd)
            d->setAdjustedSliderPosition(d->value + d->pageStep);
        else if (d->repeatAction == SliderPageStepSub)
            d->setAdjustedSliderPosition(d->value - d->pageStep);
        else
            triggerAction(d->repeatAction);
    }
}

oid QAbstractSlider::sliderChange(SliderChange)
{
    update();
}


#ifndef QT_NO_WHEELEVENT
void QAbstractSlider::wheelEvent(QWheelEvent * e)
{
    Q_D(QAbstractSlider);
    e->ignore();
    if (e->orientation() != d->orientation && !rect().contains(e->pos()))
        return;

    static qreal offset = 0;
    static QAbstractSlider *offset_owner = 0;
    if (offset_owner != this){
        offset_owner = this;
        offset = 0;
    }

    int step = qMin(QApplication::wheelScrollLines() * d->singleStep, d->pageStep);
    if ((e->modifiers() & Qt::ControlModifier) || (e->modifiers() & Qt::ShiftModifier))
        step = d->pageStep;
    offset += e->delta() * step / 120;
    if (d->invertedControls)
        offset = -offset;

    if (qAbs(offset) < 1)
        return;

    int prevValue = d->value;
    d->position = d->value + int(offset); // value will be updated by triggerAction()
    triggerAction(SliderMove);
    if (prevValue == d->value) {
        offset = 0;
    } else {
        offset -= int(offset);
        e->accept();
    }
}
#endif
void QAbstractSlider::keyPressEvent(QKeyEvent *ev)
{
    Q_D(QAbstractSlider);
    SliderAction action = SliderNoAction;
    switch (ev->key()) {
#ifdef QT_KEYPAD_NAVIGATION
        case Qt::Key_Select:
            if (QApplication::keypadNavigationEnabled())
                setEditFocus(!hasEditFocus());
            else
                ev->ignore();
            break;
        case Qt::Key_Back:
            if (QApplication::keypadNavigationEnabled() && hasEditFocus()) {
                setValue(d->origValue);
                setEditFocus(false);
            } else
                ev->ignore();
            break;
#endif

        // It seems we need to use invertedAppearance for Left and right, otherwise, things look weird.
        case Qt::Key_Left:
#ifdef QT_KEYPAD_NAVIGATION
            if (QApplication::keypadNavigationEnabled() && !hasEditFocus()) {
                ev->ignore();
                return;
            }
            if (QApplication::keypadNavigationEnabled() && d->orientation == Qt::Vertical)
                action = d->invertedControls ? SliderSingleStepSub : SliderSingleStepAdd;
            else
#endif
            action = !d->invertedAppearance ? SliderSingleStepSub : SliderSingleStepAdd;
            break;
        case Qt::Key_Right:
#ifdef QT_KEYPAD_NAVIGATION
            if (QApplication::keypadNavigationEnabled() && !hasEditFocus()) {
                ev->ignore();
                return;
            }
            if (QApplication::keypadNavigationEnabled() && d->orientation == Qt::Vertical)
                action = d->invertedControls ? SliderSingleStepAdd : SliderSingleStepSub;
            else
#endif
            action = !d->invertedAppearance ? SliderSingleStepAdd : SliderSingleStepSub;
            break;
        case Qt::Key_Up:
#ifdef QT_KEYPAD_NAVIGATION
            if (QApplication::keypadNavigationEnabled()) {
                ev->ignore();
                break;
            }
#endif
            action = d->invertedControls ? SliderSingleStepSub : SliderSingleStepAdd;
            break;
        case Qt::Key_Down:
#ifdef QT_KEYPAD_NAVIGATION
            if (QApplication::keypadNavigationEnabled()) {
                ev->ignore();
                break;
            }
#endif
            action = d->invertedControls ? SliderSingleStepAdd : SliderSingleStepSub;
            break;
        case Qt::Key_PageUp:
            action = d->invertedControls ? SliderPageStepSub : SliderPageStepAdd;
            break;
        case Qt::Key_PageDown:
            action = d->invertedControls ? SliderPageStepAdd : SliderPageStepSub;
            break;
        case Qt::Key_Home:
            action = SliderToMinimum;
            break;
        case Qt::Key_End:
            action = SliderToMaximum;
            break;
        default:
            ev->ignore();
            break;
    }
    if (action)
        triggerAction(action);
}

void QAbstractSlider::changeEvent(QEvent *ev)
{
    Q_D(QAbstractSlider);
    switch (ev->type()) {
    case QEvent::EnabledChange:
        if (!isEnabled()) {
            d->repeatActionTimer.stop();
            setSliderDown(false);
        }
        // fall through...
    default:
        QWidget::changeEvent(ev);
    }
}

bool QAbstractSlider::event(QEvent *e)
{
#ifdef QT_KEYPAD_NAVIGATION
    Q_D(QAbstractSlider);
    switch (e->type()) {
    case QEvent::FocusIn:
        d->origValue = d->value;
        break;
    default:
        break;
    }
#endif

    return QWidget::event(e);
}


