1 files changed, 109 insertions, 0 deletions
diff --git a/ui/qt/models/sparkline_delegate.cpp b/ui/qt/models/sparkline_delegate.cpp
new file mode 100644
index 0000000..457c829
--- /dev/null
+++ b/ui/qt/models/sparkline_delegate.cpp
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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;
+}