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#include "q3progressbar.h"

#ifndef QT_NO_PROGRESSBAR

#include "qpainter.h"

#include "qdrawutil.h"

#include "qpixmap.h"

#include "qstyle.h"

#include "qstyleoption.h"

#ifndef QT_NO_ACCESSIBILITY

#include "qaccessible.h"

#endif

#include "qevent.h"

#include <limits.h>

QT_BEGIN_NAMESPACE

/*!

    \class Q3ProgressBar

    \brief The Q3ProgressBar widget provides a horizontal progress bar.

    \compat

    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 give it the

    total number of steps and the number of steps completed so far and

    it will display the percentage of steps that have been completed.

    You can specify the total number of steps in the constructor or

    later with setTotalSteps(). The current number of steps is set

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

    beginning with reset().

    If the total is given as 0 the progress bar shows a busy indicator

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

    when using QFtp or QHttp to download items when they are unable to

    determine the size of the item being downloaded.

    \sa QProgressDialog

    \inlineimage qprogbar-m.png Screenshot in Motif style

    \inlineimage qprogbar-w.png Screenshot in Windows style

    \sa QProgressDialog

*/

/*! \obsolete

    Constructs a progress bar.

    The total number of steps is set to 100 by default.

    The \a parent, \a name and widget flags, \a f, are passed on to

    the QFrame::QFrame() constructor.

    \sa setTotalSteps()

*/

Q3ProgressBar::Q3ProgressBar(QWidget *parent, const char *name, Qt::WindowFlags f)

    : QFrame(parent, f),

      total_steps(100),

      progress_val(-1),

      percentage(-1),

      center_indicator(true),

      percentage_visible(true),

      d(0)

{

    setObjectName(QLatin1String(name));

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

    initFrame();

}

/*! \obsolete

    Constructs a progress bar.

    The \a totalSteps is the total number of steps that need to be

    completed for the operation which this progress bar represents.

    For example, if the operation is to examine 50 files, this value

    would be 50. Before examining the first file, call setProgress(0);

    call setProgress(50) after examining the last file.

    The \a parent, \a name and widget flags, \a f, are passed to the

    QFrame::QFrame() constructor.

    \sa setTotalSteps(), setProgress()

*/

Q3ProgressBar::Q3ProgressBar(int totalSteps, QWidget *parent, const char *name, Qt::WindowFlags f)

    : QFrame(parent, f),

      total_steps(totalSteps),

      progress_val(-1),

      percentage(-1),

      center_indicator(true),

      percentage_visible(true),

      d(0)

{

    setObjectName(QLatin1String(name));

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

    initFrame();

}

#endif

/*!

    Constructs a progress bar.

    The total number of steps is set to 100 by default.

    The \a parent, and widget flags, \a f, are passed on to

    the QFrame::QFrame() constructor.

    \sa setTotalSteps()

*/

Q3ProgressBar::Q3ProgressBar(QWidget *parent, Qt::WindowFlags f)

    : QFrame(parent, f),

      total_steps(100),

      progress_val(-1),

      percentage(-1),

      center_indicator(true),

      percentage_visible(true),

      d(0)

{

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

    initFrame();

}

/*!

    Constructs a progress bar.

    The \a totalSteps is the total number of steps that need to be

    completed for the operation which this progress bar represents.

    For example, if the operation is to examine 50 files, this value

    would be 50. Before examining the first file, call setProgress(0);

    call setProgress(50) after examining the last file.

    The \a parent, and widget flags, \a f, are passed to the

    QFrame::QFrame() constructor.

    \sa setTotalSteps(), setProgress()

*/

Q3ProgressBar::Q3ProgressBar(int totalSteps, QWidget *parent, Qt::WindowFlags f)

    : QFrame(parent, f),

      total_steps(totalSteps),

      progress_val(-1),

      percentage(-1),

      center_indicator(true),

      percentage_visible(true),

      d(0)

{

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

    initFrame();

}

/*!

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

    progress.

*/

void Q3ProgressBar::reset()

{

    progress_val = -1;

    percentage = -1;

    setIndicator(progress_str, progress_val, total_steps);

    repaint();

}

/*!

    \property Q3ProgressBar::totalSteps

    \brief The total number of steps.

    If totalSteps is 0, the progress bar will display a busy

    indicator.

*/

void Q3ProgressBar::setTotalSteps(int totalSteps)

{

    total_steps = totalSteps;

    // Current progress is invalid if larger than total

    if (total_steps < progress_val)

        progress_val = -1;

    if (isVisible() &&

         (setIndicator(progress_str, progress_val, total_steps) || !total_steps))

        repaint();

}

/*!

    \property Q3ProgressBar::progress

    \brief The current amount of progress

    This property is -1 if progress counting has not started.

*/

void Q3ProgressBar::setProgress(int progress)

{

    if (progress == progress_val ||

         progress < 0 || ((progress > total_steps) && total_steps))

        return;

    int old_progress_val = progress_val;

    progress_val = progress;

    if (setIndicator(progress_str, progress_val, total_steps)

        || ( total_steps == 0 || (width() * progress_val / total_steps != width() * old_progress_val / total_steps )))

        repaint();

#ifndef QT_NO_ACCESSIBILITY

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

#endif

}

/*!

    \overload

    Sets the amount of progress to \a progress and the total number of

    steps to \a totalSteps.

    \sa setTotalSteps()

*/

void Q3ProgressBar::setProgress(int progress, int totalSteps)

{

    if (total_steps != totalSteps)

        setTotalSteps(totalSteps);

    setProgress(progress);

}

/*!

  \property Q3ProgressBar::progressString

  \brief the amount of progress as a string

    This property is an empty string if progress counting has not started.

*/

static QStyleOptionProgressBar getStyleOption(const Q3ProgressBar *pb)

{

    QStyleOptionProgressBar opt;

    opt.init(pb);

    opt.rect = pb->contentsRect();

    opt.minimum = 0;

    opt.maximum = pb->totalSteps();

    opt.progress = pb->progress();

    if (pb->centerIndicator())

        opt.textAlignment = Qt::AlignCenter;

    else

        opt.textAlignment = Qt::AlignAuto;

    opt.textVisible = pb->percentageVisible();

    opt.text = pb->progressString();

    return opt;

}

/*!

    \reimp

*/

QSize Q3ProgressBar::sizeHint() const

{

    ensurePolished();

    QFontMetrics fm = fontMetrics();

    QStyleOptionProgressBar opt = getStyleOption(this);

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

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

                                    QSize(cw * 7 + fm.width(QLatin1Char('0')) * 4, fm.height() + 8), this);

}

/*!

    \reimp

*/

QSize Q3ProgressBar::minimumSizeHint() const

{

    return sizeHint();

}

/*!

    \property Q3ProgressBar::centerIndicator

    \brief whether the indicator string should be centered

*/

void Q3ProgressBar::setCenterIndicator(bool on)

{

    if (on == center_indicator)

        return;

    center_indicator = on;

    repaint();

}

/*!

    \property Q3ProgressBar::percentageVisible

    \brief whether the current progress value is displayed

    The default is true.

    \sa centerIndicator

*/

void Q3ProgressBar::setPercentageVisible(bool on)

{

    if (on == percentage_visible)

        return;

    percentage_visible = on;

    repaint();

}

/*!

    \reimp

*/

void Q3ProgressBar::setVisible(bool visible)

{

    if (visible)

        setIndicator(progress_str, progress_val, total_steps);

    QFrame::setVisible(visible);

}

void Q3ProgressBar::initFrame()

{

    setFrameStyle(QFrame::NoFrame);

}

/*!

    \reimp

*/

void Q3ProgressBar::changeEvent(QEvent *ev)

{

    if(ev->type() == QEvent::StyleChange)

        initFrame();

    QFrame::changeEvent(ev);

}

/*!

    This method is called to generate the text displayed in the center

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

    The \a progress may be negative, indicating that the progress bar

    is in the "reset" state before any progress is set.

    The default implementation is the percentage of completion or

    blank in the reset state. The percentage is calculated based on

    the \a progress and \a totalSteps. You can set the \a indicator

    text if you wish.

    To allow efficient repainting of the progress bar, this method

    should return false if the string is unchanged from the last call

    to this function.

*/

bool Q3ProgressBar::setIndicator(QString & indicator, int progress,

                                 int totalSteps)

{

    if (!totalSteps)

        return false;

    if (progress < 0) {

        indicator = QString::fromLatin1("");

        return true;

    } else {

        // Get the values down to something usable.

        if (totalSteps > INT_MAX/1000) {

            progress /= 1000;

            totalSteps /= 1000;

        }

        int np = progress * 100 / totalSteps;

        if (np != percentage) {

            percentage = np;

            indicator.sprintf("%d%%", np);

            return true;

        } else {

            return false;

        }

    }

}

/*!

    \reimp

*/

void Q3ProgressBar::paintEvent(QPaintEvent *)

{

    QPainter paint(this);

    QPainter *p = &paint;

    drawFrame(p);

    QStyleOptionProgressBar opt = getStyleOption(this);

    opt.rect = style()->subElementRect(QStyle::SE_ProgressBarGroove, &opt, this);

    style()->drawControl(QStyle::CE_ProgressBarGroove, &opt, p, this);

    opt.rect = contentsRect();

    opt.rect = style()->subElementRect(QStyle::SE_ProgressBarContents, &opt, this);

    style()->drawControl(QStyle::CE_ProgressBarContents, &opt, p, this);

    if (percentageVisible()) {

        opt.rect = contentsRect();

        opt.rect = style()->subElementRect(QStyle::SE_ProgressBarLabel, &opt, this);

        style()->drawControl(QStyle::CE_ProgressBarLabel, &opt, p, this);

    }

}

/*!

    \fn void Q3ProgressBar::setMargin(int margin)

    \since 4.2

    Sets the width of the margin around the contents of the widget to \a margin.

    This function uses QWidget::setContentsMargins() to set the margin.

    \sa margin(), QWidget::setContentsMargins()

*/

/*!

    \fn int Q3ProgressBar::margin() const

    \since 4.2

    Returns the width of the margin around the contents of the widget.

    This function uses QWidget::getContentsMargins() to get the margin.

    \sa setMargin(), QWidget::getContentsMargins()

*/

QT_END_NAMESPACE