// vim: set tabstop=4 shiftwidth=4 expandtab:
/*
Gwenview: an image viewer
Copyright 2009 Aurélien Gâteau <agateau@kde.org>

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.

*/
// Self
#include "tooltipwidget.moc"

// Qt
#include <QPainter>
#include <QPainterPath>
#include <QToolTip>

// KDE
#include <KDebug>
#include <KColorScheme>

// Local
#include <lib/paintutils.h>

static const int RADIUS = 5;
static const int HMARGIN = 2;

namespace Gwenview
{

struct ToolTipWidgetPrivate
{
    QString mText;
    qreal mOpacity;
};

ToolTipWidget::ToolTipWidget(QWidget* parent)
: QWidget(parent)
, d(new ToolTipWidgetPrivate)
{
    d->mOpacity = 1.;
    setAttribute(Qt::WA_NoSystemBackground);
}

ToolTipWidget::~ToolTipWidget()
{
    delete d;
}

qreal ToolTipWidget::opacity() const
{
    return d->mOpacity;
}

void ToolTipWidget::setOpacity(qreal opacity)
{
    d->mOpacity = opacity;
    update();
}

QString ToolTipWidget::text() const
{
    return d->mText;
}

void ToolTipWidget::setText(const QString& text)
{
    d->mText = text;
    update();
}

QSize ToolTipWidget::sizeHint() const
{
    QSize sh = fontMetrics().size(0 /* flags */, d->mText);
    return QSize(sh.width() + 2 * HMARGIN, sh.height());
}

void ToolTipWidget::paintEvent(QPaintEvent*)
{
    QColor bg2Color = palette().color(QPalette::Highlight);
    QColor bg1Color = KColorScheme::shade(bg2Color, KColorScheme::LightShade, 0.2);

    QLinearGradient gradient(QPointF(0.0, 0.0), QPointF(0.0, height()));
    gradient.setColorAt(0.0, bg1Color);
    gradient.setColorAt(1.0, bg2Color);

    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.setOpacity(d->mOpacity);
    QPainterPath path = PaintUtils::roundedRectangle(rect(), RADIUS);
    painter.fillPath(path, gradient);
    painter.setPen(palette().color(QPalette::HighlightedText));
    painter.drawText(rect().adjusted(HMARGIN, 0, -HMARGIN, 0), 0 /* flags */, d->mText);
}

} // namespace