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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the Qt3Support 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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 with of the the margin around the contents of the widget.
+    
+    This function uses QWidget::getContentsMargins() to get the margin.
+    \sa setMargin(), QWidget::getContentsMargins()
+*/
+
+QT_END_NAMESPACE