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