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/* overlay_scroll_bar.cpp
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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, Boston, MA 02110-1301 USA.
*/
#include "overlay_scroll_bar.h"
#include <QPainter>
#include <QResizeEvent>
#include <QStyle>
#include <QStyleOptionSlider>
// To do:
// - The slider hole doesn't match up with the slider on OS X + Qt 5.3.2.
OverlayScrollBar::OverlayScrollBar(Qt::Orientation orientation, QWidget *parent) :
QScrollBar(orientation, parent = 0),
near_overlay_(QImage()),
far_overlay_(QImage()),
selected_pos_(-1)
{}
QSize OverlayScrollBar::sizeHint() const
{
return QSize(QScrollBar::sizeHint().width() + (far_overlay_.width() * 2), QScrollBar::sizeHint().height());
}
void OverlayScrollBar::setNearOverlayImage(QImage &overlay_image, int selected_pos)
{
near_overlay_ = overlay_image;
selected_pos_ = selected_pos;
update();
}
void OverlayScrollBar::setFarOverlayImage(QImage &overlay_image)
{
int old_width = far_overlay_.width();
far_overlay_ = overlay_image;
if (old_width != far_overlay_.width()) {
updateGeometry();
}
update();
}
QRect OverlayScrollBar::grooveRect()
{
QStyleOptionSlider opt;
initStyleOption(&opt);
return style()->subControlRect(QStyle::CC_ScrollBar, &opt, QStyle::SC_ScrollBarGroove, this);
}
void OverlayScrollBar::paintEvent(QPaintEvent *event)
{
QScrollBar::paintEvent(event);
if (!near_overlay_.isNull()) {
QRect groove_rect = grooveRect();
QSize gr_size = groove_rect.size();
qreal dp_ratio = 1.0;
#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
dp_ratio = devicePixelRatio();
gr_size *= dp_ratio;
#endif
QImage groove_overlay(gr_size, QImage::Format_ARGB32_Premultiplied);
groove_overlay.fill(Qt::transparent);
// Draw the image supplied by the packet list and apply a mask.
QPainter go_painter(&groove_overlay);
go_painter.setPen(Qt::NoPen);
int fo_width = far_overlay_.width();
QRect near_dest(fo_width, 0, gr_size.width() - (fo_width * 2), gr_size.height());
go_painter.drawImage(near_dest, near_overlay_.scaled(near_dest.size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
if (fo_width > 0) {
QRect far_dest(0, 0, fo_width, gr_size.height());
go_painter.drawImage(far_dest, far_overlay_);
far_dest.moveLeft(gr_size.width() - fo_width);
go_painter.drawImage(far_dest, far_overlay_.mirrored(true, false));
}
// Selected packet indicator
if (selected_pos_ >= 0 && selected_pos_ < near_overlay_.height()) {
int no_pos = near_dest.height() * selected_pos_ / near_overlay_.height();
go_painter.save();
go_painter.setBrush(palette().highlight().color());
go_painter.drawRect(0, no_pos, gr_size.width(), dp_ratio);
go_painter.restore();
}
// Outline
QRect near_outline(near_dest);
near_outline.adjust(0, 0, -1, -1);
go_painter.save();
QColor no_fg(palette().text().color());
no_fg.setAlphaF(0.25);
go_painter.setPen(no_fg);
go_painter.drawRect(near_outline);
go_painter.restore();
// Punch a hole for the slider.
QStyleOptionSlider opt;
initStyleOption(&opt);
QRect slider_rect = style()->subControlRect(QStyle::CC_ScrollBar, &opt, QStyle::SC_ScrollBarSlider, this);
#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
slider_rect.setHeight(slider_rect.height() * devicePixelRatio());
slider_rect.setWidth(slider_rect.width() * devicePixelRatio());
slider_rect.moveTop((slider_rect.top() - groove_rect.top()) * devicePixelRatio());
#else
slider_rect.moveTop(slider_rect.top() - groove_rect.top());
#endif
slider_rect.adjust(fo_width + 1, 1, -1 - fo_width, -1);
go_painter.save();
go_painter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
QColor slider_hole(Qt::white);
slider_hole.setAlphaF(0.1);
go_painter.setBrush(slider_hole);
go_painter.drawRect(slider_rect);
go_painter.restore();
// Draw over the groove.
QPainter painter(this);
#if QT_VERSION >= QT_VERSION_CHECK(5, 1, 0)
groove_overlay.setDevicePixelRatio(devicePixelRatio());
#endif
painter.drawImage(groove_rect.topLeft(), groove_overlay);
}
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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