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/* sparkline_delegate.cpp
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <ui/qt/models/sparkline_delegate.h>
#include <QPainter>
#include <QApplication>
#define SPARKLINE_MIN_EM_WIDTH 10
void SparkLineDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
QList<int> points = qvariant_cast<QList<int> >(index.data(Qt::UserRole));
int max = 1;
// We typically draw a sparkline alongside some text. Size our
// drawing area based on an Em width. and a bit of eyballing on
// Linux, macOS, and Windows.
int em_w = option.fontMetrics.height();
int content_w = option.rect.width() - (em_w / 4);
int content_h = option.fontMetrics.ascent() - 1;
int val;
qreal idx = 0.0;
qreal step_w = em_w / 10.0;
qreal steps = content_w / step_w;
QVector<QPointF> fpoints;
QStyledItemDelegate::paint(painter, option, index);
if (points.isEmpty() || steps < 1.0 || content_h <= 0) {
return;
}
while ((qreal) points.length() > steps) {
points.removeFirst();
}
foreach (val, points) {
if (val > max) max = val;
}
foreach (val, points) {
fpoints.append(QPointF(idx, (qreal) content_h - (val * content_h / max)));
idx = idx + step_w;
}
QStyleOptionViewItem option_vi = option;
QStyledItemDelegate::initStyleOption(&option_vi, index);
painter->save();
if (QApplication::style()->objectName().contains("vista")) {
// QWindowsVistaStyle::drawControl does this internally. Unfortunately there
// doesn't appear to be a more general way to do this.
option_vi.palette.setColor(QPalette::All, QPalette::HighlightedText, option_vi.palette.color(QPalette::Active, QPalette::Text));
}
QPalette::ColorGroup cg = option_vi.state & QStyle::State_Enabled
? QPalette::Normal : QPalette::Disabled;
if (cg == QPalette::Normal && !(option_vi.state & QStyle::State_Active))
cg = QPalette::Inactive;
#if defined(Q_OS_WIN)
if (option_vi.state & QStyle::State_Selected) {
#else
if ((option_vi.state & QStyle::State_Selected) && !(option_vi.state & QStyle::State_MouseOver)) {
#endif
painter->setPen(option_vi.palette.color(cg, QPalette::HighlightedText));
} else {
painter->setPen(option_vi.palette.color(cg, QPalette::Text));
}
// As a general rule, aliased painting renders to pixels and
// antialiased painting renders to mathematical coordinates:
// https://doc.qt.io/qt-5/coordsys.html
// Shift our coordinates by 0.5 pixels, otherwise our lines end
// up blurry.
painter->setRenderHint(QPainter::Antialiasing, true);
painter->translate(
option.rect.x() + (em_w / 8) + 0.5,
option.rect.y() + ((option.rect.height() - option.fontMetrics.height()) / 2) + 1 + 0.5);
painter->drawPolyline(QPolygonF(fpoints));
// Some sparklines are decorated with dots at the beginning and end.
// Ours look better without in my (gcc) opinion.
// painter->setPen(Qt::NoPen);
// painter->setBrush(option.palette.foreground());
// painter->drawEllipse(fpoints.first(), 2, 2);
// painter->setBrush(Qt::red);
// painter->drawEllipse(fpoints.last(), 2, 2);
painter->restore();
}
QSize SparkLineDelegate::sizeHint(const QStyleOptionViewItem &option,
const QModelIndex &index) const {
return QSize(option.fontMetrics.height() * SPARKLINE_MIN_EM_WIDTH, QStyledItemDelegate::sizeHint(option, index).height());
}
QWidget *SparkLineDelegate::createEditor(QWidget *, const QStyleOptionViewItem &, const QModelIndex &) const
{
return NULL;
}
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