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**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** This file is part of Qt Creator.
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** 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
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#include "progressbar.h"

#include <utils/stylehelper.h>

#include <QPropertyAnimation>
#include <QPainter>
#include <QFont>
#include <QBrush>
#include <QColor>
#include <QMouseEvent>

using namespace Core;
using namespace Core::Internal;

#define PROGRESSBAR_HEIGHT 12
#define CANCELBUTTON_SIZE 15

ProgressBar::ProgressBar(QWidget *parent)
    : QWidget(parent), m_error(false), m_minimum(1), m_maximum(100), m_value(1), m_cancelButtonFader(0), m_finished(false)
{
    setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
    setMouseTracking(true);
}

ProgressBar::~ProgressBar()
{
}

bool ProgressBar::event(QEvent *e)
{
    switch(e->type()) {
    case QEvent::Enter:
        {
            QPropertyAnimation *animation = new QPropertyAnimation(this, "cancelButtonFader");
            animation->setDuration(125);
            animation->setEndValue(1.0);
            animation->start(QAbstractAnimation::DeleteWhenStopped);
        }
        break;
    case QEvent::Leave:
        {
            QPropertyAnimation *animation = new QPropertyAnimation(this, "cancelButtonFader");
            animation->setDuration(225);
            animation->setEndValue(0.0);
            animation->start(QAbstractAnimation::DeleteWhenStopped);
        }
        break;
    default:
        return QWidget::event(e);
    }
    return false;
}


void ProgressBar::reset()
{
    m_value = m_minimum;
    update();
}

void ProgressBar::setRange(int minimum, int maximum)
{
    m_minimum = minimum;
    m_maximum = maximum;
    if (m_value < m_minimum || m_value > m_maximum)
        m_value = m_minimum;
    update();
}

void ProgressBar::setValue(int value)
{
    if (m_value == value
            || m_value < m_minimum
            || m_value > m_maximum) {
        return;
    }
    m_value = value;
    update();
}

void ProgressBar::setFinished(bool b)
{
    if (b == m_finished)
        return;
    m_finished = b;
    update();
}

QString ProgressBar::title() const
{
    return m_title;
}

bool ProgressBar::hasError() const
{
    return m_error;
}

void ProgressBar::setTitle(const QString &title)
{
    m_title = title;
    update();
}

void ProgressBar::setError(bool on)
{
    m_error = on;
    update();
}

QSize ProgressBar::sizeHint() const
{
    QSize s;
    s.setWidth(50);
    s.setHeight(fontMetrics().height() + PROGRESSBAR_HEIGHT + 6);
    return s;
}

namespace { const int INDENT = 6; }

void ProgressBar::mousePressEvent(QMouseEvent *event)
{
    QFont boldFont(font());
    boldFont.setPointSizeF(Utils::StyleHelper::sidebarFontSize());
    boldFont.setBold(true);
    QFontMetrics fm(boldFont);
    int h = fm.height();
    QRect rect(INDENT - 1, h+8, size().width()-2*INDENT + 1, m_progressHeight-1);
    QRect cancelRect(rect.adjusted(rect.width() - CANCELBUTTON_SIZE, 1, -1, 0));

    if (event->modifiers() == Qt::NoModifier
        && cancelRect.contains(event->pos())) {
        event->accept();
        emit clicked();
        return;
    }
    QWidget::mousePressEvent(event);
}

void ProgressBar::mouseMoveEvent(QMouseEvent *)
{
    update();
}

void ProgressBar::paintEvent(QPaintEvent *)
{
    // TODO move font into Utils::StyleHelper
    // TODO use Utils::StyleHelper white

    if (bar.isNull())
        bar.load(QLatin1String(":/core/images/progressbar.png"));

    double range = maximum() - minimum();
    double percent = 0.;
    if (range != 0)
        percent = (value() - minimum()) / range;
    if (percent > 1)
        percent = 1;
    else if (percent < 0)
        percent = 0;

    if (finished())
        percent = 1;

    QPainter p(this);
    QFont boldFont(p.font());
    boldFont.setPointSizeF(Utils::StyleHelper::sidebarFontSize());
    boldFont.setBold(true);
    p.setFont(boldFont);
    QFontMetrics fm(boldFont);

    // Draw separator
    int h = fm.height();
    p.setPen(Utils::StyleHelper::sidebarShadow());
    p.drawLine(0,0, size().width(), 0);

    p.setPen(Utils::StyleHelper::sidebarHighlight());
    p.drawLine(1, 1, size().width(), 1);

    QRect textBounds = fm.boundingRect(m_title);
    textBounds.moveCenter(rect().center());
    int alignment = Qt::AlignHCenter;

    int textSpace = rect().width() - 8;
    // If there is not enough room when centered, we left align and
    // elide the text
    QString elidedtitle  = fm.elidedText(m_title, Qt::ElideRight, textSpace);

    QRect textRect = rect().adjusted(3, 1, -3, 0);
    textRect.setHeight(h+5);

    p.setPen(QColor(0, 0, 0, 120));
    p.drawText(textRect, alignment | Qt::AlignBottom, elidedtitle);
    p.translate(0, -1);
    p.setPen(Utils::StyleHelper::panelTextColor());
    p.drawText(textRect, alignment | Qt::AlignBottom, elidedtitle);
    p.translate(0, 1);

    m_progressHeight = PROGRESSBAR_HEIGHT;
    m_progressHeight += ((m_progressHeight % 2) + 1) % 2; // make odd
    // draw outer rect
    QRect rect(INDENT - 1, h+6, size().width()-2*INDENT + 1, m_progressHeight-1);
    p.setPen(Utils::StyleHelper::panelTextColor());
    Utils::StyleHelper::drawCornerImage(bar, &p, rect, 2, 2, 2, 2);

    // draw inner rect
    QColor c = Utils::StyleHelper::panelTextColor();
    c.setAlpha(180);
    p.setPen(Qt::NoPen);


    QRect inner = rect.adjusted(3, 2, -2, -2);
    inner.adjust(0, 0, qRound((percent - 1) * inner.width()), 0);
    if (m_error) {
        QColor red(255, 60, 0, 210);
        c = red;
        // avoid too small red bar
        if (inner.width() < 10)
            inner.adjust(0, 0, 10 - inner.width(), 0);
    } else if (m_finished) {
        c = QColor(90, 170, 60);
    }

    // Draw line and shadow after the gradient fill
    if (value() > 0 && value() < maximum()) {
        p.fillRect(QRect(inner.right() + 1, inner.top(), 2, inner.height()), QColor(0, 0, 0, 20));
        p.fillRect(QRect(inner.right() + 1, inner.top(), 1, inner.height()), QColor(0, 0, 0, 60));
    }
    QLinearGradient grad(inner.topLeft(), inner.bottomLeft());
    grad.setColorAt(0, c.lighter(130));
    grad.setColorAt(0.5, c.lighter(106));
    grad.setColorAt(0.51, c.darker(106));
    grad.setColorAt(1, c.darker(130));
    p.setPen(Qt::NoPen);
    p.setBrush(grad);
    p.drawRect(inner);
    p.setBrush(Qt::NoBrush);
    p.setPen(QPen(QColor(0, 0, 0, 30), 1));
    p.drawLine(inner.topLeft(), inner.topRight());
    p.drawLine(inner.topLeft(), inner.bottomLeft());
    p.drawLine(inner.topRight(), inner.bottomRight());
    p.drawLine(inner.bottomLeft(), inner.bottomRight());
    p.drawPoint(inner.bottomLeft());
    p.drawPoint(inner.bottomRight());

    // Draw cancel button
    p.setOpacity(m_cancelButtonFader);

    if (value() < maximum() && !m_error) {
        QRect cancelRect(rect.adjusted(rect.width() - CANCELBUTTON_SIZE, 1, -1, 0));
        bool hover = cancelRect.contains(mapFromGlobal(QCursor::pos()));
        QLinearGradient grad(cancelRect.topLeft(), cancelRect.bottomLeft());
        int intensity = hover ? 90 : 70;
        QColor buttonColor(intensity, intensity, intensity, 255);
        grad.setColorAt(0, buttonColor.lighter(130));
        grad.setColorAt(1, buttonColor.darker(130));
        p.setPen(Qt::NoPen);
        p.setBrush(grad);
        p.drawRect(cancelRect.adjusted(1, 1, -1, -1));

        p.setPen(QPen(QColor(0, 0, 0, 30)));
        p.drawLine(cancelRect.topLeft() + QPoint(0,1), cancelRect.bottomLeft() + QPoint(0,-1));
        p.setPen(QPen(QColor(0, 0, 0, 120)));
        p.drawLine(cancelRect.topLeft() + QPoint(1,1), cancelRect.bottomLeft() + QPoint(1,-1));
        p.setPen(QPen(QColor(255, 255, 255, 30)));
        p.drawLine(cancelRect.topLeft() + QPoint(2,1), cancelRect.bottomLeft() + QPoint(2,-1));
        p.setPen(QPen(hover ? Utils::StyleHelper::panelTextColor() : QColor(180, 180, 180), 1));
        p.setRenderHint(QPainter::Antialiasing);
        p.translate(0.5, 0.5);
        p.drawLine(cancelRect.center()+QPoint(-1,-2), cancelRect.center()+QPoint(+3,+2));
        p.drawLine(cancelRect.center()+QPoint(+3,-2), cancelRect.center()+QPoint(-1,+2));
    }
}