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#include "qprogressbar.h"

#ifndef QT_NO_PROGRESSBAR

#include <qevent.h>

#include <qpainter.h>

#include <qstylepainter.h>

#include <qstyleoption.h>

#include <private/qwidget_p.h>

#ifndef QT_NO_ACCESSIBILITY

#include <qaccessible.h>

#endif

#include <limits.h>

QT_BEGIN_NAMESPACE

class QProgressBarPrivate : public QWidgetPrivate

{

    Q_DECLARE_PUBLIC(QProgressBar)

public:

    QProgressBarPrivate();

    void init();

    inline void resetLayoutItemMargins();

    int minimum;

    int maximum;

    int value;

    Qt::Alignment alignment;

    uint textVisible : 1;

    int lastPaintedValue;

    Qt::Orientation orientation;

    bool invertedAppearance;

    QProgressBar::Direction textDirection;

    QString format;

    inline int bound(int val) const { return qMax(minimum-1, qMin(maximum, val)); }

    bool repaintRequired() const;

};

QProgressBarPrivate::QProgressBarPrivate()

    : minimum(0), maximum(100), value(-1), alignment(Qt::AlignLeft), textVisible(true),

      lastPaintedValue(-1), orientation(Qt::Horizontal), invertedAppearance(false),

      textDirection(QProgressBar::TopToBottom), format(QLatin1String("%p%"))

{

}

void QProgressBarPrivate::init()

{

    Q_Q(QProgressBar);

    QSizePolicy sp(QSizePolicy::Expanding, QSizePolicy::Fixed);

    if (orientation == Qt::Vertical)

        sp.transpose();

    q->setSizePolicy(sp);

    q->setAttribute(Qt::WA_WState_OwnSizePolicy, false);

    resetLayoutItemMargins();

}

void QProgressBarPrivate::resetLayoutItemMargins()

{

    Q_Q(QProgressBar);

    QStyleOptionProgressBar option;

    q->initStyleOption(&option);

    setLayoutItemMargins(QStyle::SE_ProgressBarLayoutItem, &option);

}

/*!

    Initialize \a option with the values from this QProgressBar. This method is useful

    for subclasses when they need a QStyleOptionProgressBar or QStyleOptionProgressBarV2,

    but don't want to fill in all the information themselves. This function will check the version

    of the QStyleOptionProgressBar and fill in the additional values for a

    QStyleOptionProgressBarV2.

    \sa QStyleOption::initFrom()

*/

void QProgressBar::initStyleOption(QStyleOptionProgressBar *option) const

{

    if (!option)

        return;

    Q_D(const QProgressBar);

    option->initFrom(this);

    if (d->orientation == Qt::Horizontal)

        option->state |= QStyle::State_Horizontal;

    option->minimum = d->minimum;

    option->maximum = d->maximum;

    option->progress = d->value;

    option->textAlignment = d->alignment;

    option->textVisible = d->textVisible;

    option->text = text();

    if (QStyleOptionProgressBarV2 *optionV2

            = qstyleoption_cast<QStyleOptionProgressBarV2 *>(option)) {

        optionV2->orientation = d->orientation;  // ### Qt 5: use State_Horizontal instead

        optionV2->invertedAppearance = d->invertedAppearance;

        optionV2->bottomToTop = (d->textDirection == QProgressBar::BottomToTop);

    }

}

bool QProgressBarPrivate::repaintRequired() const

{

    Q_Q(const QProgressBar);

    if (value == lastPaintedValue)

        return false;

    int valueDifference = qAbs(value - lastPaintedValue);

    // Check if the text needs to be repainted

    if (value == minimum || value == maximum)

        return true;

    if (textVisible) {

        if ((format.contains(QLatin1String("%v"))))

            return true;

        if ((format.contains(QLatin1String("%p"))

             && valueDifference >= qAbs((maximum - minimum) / 100)))

            return true;

    }

    // Check if the bar needs to be repainted

    QStyleOptionProgressBarV2 opt;

    q->initStyleOption(&opt);

    int cw = q->style()->pixelMetric(QStyle::PM_ProgressBarChunkWidth, &opt, q);

    QRect groove  = q->style()->subElementRect(QStyle::SE_ProgressBarGroove, &opt, q);

    // This expression is basically

    // (valueDifference / (maximum - minimum) > cw / groove.width())

    // transformed to avoid integer division.

    int grooveBlock = (q->orientation() == Qt::Horizontal) ? groove.width() : groove.height();

    return (valueDifference * grooveBlock > cw * (maximum - minimum));

}

/*!

    \class QProgressBar

    \brief The QProgressBar widget provides a horizontal or vertical progress bar.

    \ingroup basicwidgets

    A progress bar is used to give the user an indication of the

    progress of an operation and to reassure them that the application

    is still running.

    The progress bar uses the concept of \e steps. You set it up by

    specifying the minimum and maximum possible step values, and it

    will display the percentage of steps that have been completed

    when you later give it the current step value. The percentage is

    calculated by dividing the progress (value() - minimum()) divided

    by maximum() - minimum().

    You can specify the minimum and maximum number of steps with

    setMinimum() and setMaximum. The current number of steps is set

    with setValue(). The progress bar can be rewound to the

    beginning with reset().

    If minimum and maximum both are set to 0, the bar shows a busy

    indicator instead of a percentage of steps. This is useful, for

    example, when using QFtp or QNetworkAccessManager to download

    items when they are unable to determine the size of the item being

    downloaded.

    \table

    \row \o \inlineimage macintosh-progressbar.png Screenshot of a Macintosh style progress bar

         \o A progress bar shown in the Macintosh widget style.

    \row \o \inlineimage windowsxp-progressbar.png Screenshot of a Windows XP style progress bar

         \o A progress bar shown in the Windows XP widget style.

    \row \o \inlineimage plastique-progressbar.png Screenshot of a Plastique style progress bar

         \o A progress bar shown in the Plastique widget style.

    \endtable

    \sa QProgressDialog, {fowler}{GUI Design Handbook: Progress Indicator}

*/

/*!

    \since 4.1

    \enum QProgressBar::Direction

    \brief Specifies the reading direction of the \l text for vertical progress bars.

    \value TopToBottom The text is rotated 90 degrees clockwise.

    \value BottomToTop The text is rotated 90 degrees counter-clockwise.

    Note that whether or not the text is drawn is dependent on the style.

    Currently CDE, CleanLooks, Motif, and Plastique draw the text. Mac, Windows

    and WindowsXP style do not.

    \sa textDirection

*/

/*!

    \fn void QProgressBar::valueChanged(int value)

    This signal is emitted when the value shown in the progress bar changes.

    \a value is the new value shown by the progress bar.

*/

/*!

    Constructs a progress bar with the given \a parent.

    By default, the minimum step value is set to 0, and the maximum to 100.

    \sa setRange()

*/

QProgressBar::QProgressBar(QWidget *parent)

    : QWidget(*(new QProgressBarPrivate), parent, 0)

{

    d_func()->init();

}

/*!

    Reset the progress bar. The progress bar "rewinds" and shows no

    progress.

*/

void QProgressBar::reset()

{

    Q_D(QProgressBar);

    d->value = d->minimum - 1;

    if (d->minimum == INT_MIN)

        d->value = INT_MIN;

    repaint();

}

/*!

    \property QProgressBar::minimum

    \brief the progress bar's minimum value

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

    necessary to ensure that the range remains valid. If the

    current value falls outside the new range, the progress bar is reset

    with reset().

*/

void QProgressBar::setMinimum(int minimum)

{

    setRange(minimum, qMax(d_func()->maximum, minimum));

}

int QProgressBar::minimum() const

{

    return d_func()->minimum;

}

/*!

    \property QProgressBar::maximum

    \brief the progress bar's maximum value

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

    necessary to ensure that the range remains valid. If the

    current value falls outside the new range, the progress bar is reset

    with reset().

*/

void QProgressBar::setMaximum(int maximum)

{

    setRange(qMin(d_func()->minimum, maximum), maximum);

}

int QProgressBar::maximum() const

{

    return d_func()->maximum;

}

/*!

    \property QProgressBar::value

    \brief the progress bar's current value

    Attempting to change the current value to one outside

    the minimum-maximum range has no effect on the current value.

*/

void QProgressBar::setValue(int value)

{

    Q_D(QProgressBar);

    if (d->value == value

            || ((value > d->maximum || value < d->minimum)

                && (d->maximum != 0 || d->minimum != 0)))

        return;

    d->value = value;

    emit valueChanged(value);

#ifndef QT_NO_ACCESSIBILITY

    QAccessible::updateAccessibility(this, 0, QAccessible::ValueChanged);

#endif

    if (d->repaintRequired())

        repaint();

}

int QProgressBar::value() const

{

    return d_func()->value;

}

/*!

    Sets the progress bar's minimum and maximum values to \a minimum and

    \a maximum respectively.

    If \a maximum is smaller than \a minimum, \a minimum becomes the only

    legal value.

    If the current value falls outside the new range, the progress bar is reset

    with reset().

    \sa minimum maximum

*/

void QProgressBar::setRange(int minimum, int maximum)

{

    Q_D(QProgressBar);

    d->minimum = minimum;

    d->maximum = qMax(minimum, maximum);

    if ( d->value <(d->minimum-1) || d->value > d->maximum)

        reset();

}

/*!

    \property QProgressBar::textVisible

    \brief whether the current completed percentage should be displayed

    This property may be ignored by the style (e.g., QMacStyle never draws the text).

    \sa textDirection

*/

void QProgressBar::setTextVisible(bool visible)

{

    Q_D(QProgressBar);

    if (d->textVisible != visible) {

        d->textVisible = visible;

        repaint();

    }

}

bool QProgressBar::isTextVisible() const

{

    return d_func()->textVisible;

}

/*!

    \property QProgressBar::alignment

    \brief the alignment of the progress bar

*/

void QProgressBar::setAlignment(Qt::Alignment alignment)

{

    if (d_func()->alignment != alignment) {

        d_func()->alignment = alignment;

        repaint();

    }

}

Qt::Alignment QProgressBar::alignment() const

{

    return d_func()->alignment;

}

/*!

    \reimp

*/

void QProgressBar::paintEvent(QPaintEvent *)

{

    QStylePainter paint(this);

    QStyleOptionProgressBarV2 opt;

    initStyleOption(&opt);

    paint.drawControl(QStyle::CE_ProgressBar, opt);

    d_func()->lastPaintedValue = d_func()->value;

}

/*!

    \reimp

*/

QSize QProgressBar::sizeHint() const

{

    ensurePolished();

    QFontMetrics fm = fontMetrics();

    QStyleOptionProgressBarV2 opt;

    initStyleOption(&opt);

    int cw = style()->pixelMetric(QStyle::PM_ProgressBarChunkWidth, &opt, this);

    QSize size = QSize(qMax(9, cw) * 7 + fm.width(QLatin1Char('0')) * 4, fm.height() + 8);

    if (opt.orientation == Qt::Vertical)

        size.transpose();

    return style()->sizeFromContents(QStyle::CT_ProgressBar, &opt, size, this);

}

/*!

    \reimp

*/

QSize QProgressBar::minimumSizeHint() const

{

    QSize size;

    if (orientation() == Qt::Horizontal)

        size = QSize(sizeHint().width(), fontMetrics().height() + 2);

    else

        size = QSize(fontMetrics().height() + 2, sizeHint().height());

    return size;

}

/*!

    \property QProgressBar::text

    \brief the descriptive text shown with the progress bar

    The text returned is the same as the text displayed in the center

    (or in some styles, to the left) of the progress bar.

    The progress shown in the text may be smaller than the minimum value,

    indicating that the progress bar is in the "reset" state before any

    progress is set.

    In the default implementation, the text either contains a percentage

    value that indicates the progress so far, or it is blank because the

    progress bar is in the reset state.

*/

QString QProgressBar::text() const

{

    Q_D(const QProgressBar);

    if ((d->maximum == 0 && d->minimum == 0) || d->value < d->minimum

            || (d->value == INT_MIN && d->minimum == INT_MIN))

        return QString();

    qint64 totalSteps = qint64(d->maximum) - d->minimum;

    QString result = d->format;

    result.replace(QLatin1String("%m"), QString::number(totalSteps));

    result.replace(QLatin1String("%v"), QString::number(d->value));

    // If max and min are equal and we get this far, it means that the

    // progress bar has one step and that we are on that step. Return

    // 100% here in order to avoid division by zero further down.

    if (totalSteps == 0) {

        result.replace(QLatin1String("%p"), QString::number(100));

        return result;

    }

    int progress = (qreal(d->value) - d->minimum) * 100.0 / totalSteps;

    result.replace(QLatin1String("%p"), QString::number(progress));

    return result;

}

/*!

    \since 4.1

    \property QProgressBar::orientation

    \brief the orientation of the progress bar

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

    Qt::Vertical.

    \sa invertedAppearance, textDirection

*/

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

{

    Q_D(QProgressBar);

    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);

    }

    d->resetLayoutItemMargins();

    update();

    updateGeometry();

}

Qt::Orientation QProgressBar::orientation() const

{

    Q_D(const QProgressBar);

    return d->orientation;

}

/*!

    \since 4.1

    \property QProgressBar::invertedAppearance

    \brief whether or not a progress bar shows its progress inverted

    If this property is false, the progress bar grows in the other

    direction (e.g. from right to left). By default, the progress bar

    is not inverted.

    \sa orientation, layoutDirection

*/

void QProgressBar::setInvertedAppearance(bool invert)

{

    Q_D(QProgressBar);

    d->invertedAppearance = invert;

    update();

}

bool QProgressBar::invertedAppearance()

{

    Q_D(QProgressBar);

    return d->invertedAppearance;

}