void RelatedPacketDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
QStyleOptionViewItemV4 option_vi = option;
#else
QStyleOptionViewItem option_vi = option;
#endif
QStyledItemDelegate::initStyleOption(&option_vi, index);
int em_w = option_vi.fontMetrics.height();
int en_w = (em_w + 1) / 2;
int line_w = (option_vi.fontMetrics.lineWidth());
#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
option_vi.features |= QStyleOptionViewItemV4::HasDecoration;
#else
option_vi.features |= QStyleOptionViewItem::HasDecoration;
#endif
option_vi.decorationSize.setHeight(1);
option_vi.decorationSize.setWidth(em_w);
QStyledItemDelegate::paint(painter, option_vi, index);
guint32 setup_frame = 0, last_frame = 0;
if (conv_) {
setup_frame = (int) conv_->setup_frame;
last_frame = (int) conv_->last_frame;
}
const frame_data *fd;
PacketListRecord *record = static_cast<PacketListRecord*>(index.internalPointer());
if (!record || (fd = record->frameData()) == NULL) {
return;
}
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;
QColor fg;
if (cg == QPalette::Normal && !(option_vi.state & QStyle::State_Active))
cg = QPalette::Inactive;
if (option_vi.state & QStyle::State_Selected) {
fg = option_vi.palette.color(cg, QPalette::HighlightedText);
} else {
fg = option_vi.palette.color(cg, QPalette::Text);
}
fg = ColorUtils::alphaBlend(fg, option_vi.palette.color(cg, QPalette::Base), 0.5);
QPen line_pen(fg);
line_pen.setWidth(line_w);
line_pen.setJoinStyle(Qt::RoundJoin);
painter->setPen(line_pen);
painter->translate(option_vi.rect.x(), option_vi.rect.y());
painter->translate(en_w + 0.5, 0.5);
painter->setRenderHint(QPainter::Antialiasing, true);
int height = option_vi.rect.height();
// Uncomment to make the boundary visible.
// painter->save();
// painter->setPen(Qt::darkRed);
// painter->drawRect(QRectF(0.5, 0.5, en_w - 1, height - 1));
// painter->restore();
// The current decorations are based on what looked good and were easy
// to code.
// It might be useful to have a JACKPOT_MODE define that shows each
// decoration in sequence in order to make it easier to create
// screenshots for the User's Guide.
// Vertical line. Lower and upper half for the start and end of the
// conversation respectively, solid for conversation member, dashed
// for other packets in the start-end range.
if (setup_frame > 0 && last_frame > 0 && setup_frame != last_frame) {
if (fd->num == setup_frame) {
QPoint start_line[] = {
QPoint(en_w - 1, height / 2),
QPoint(0, height / 2),
QPoint(0, height)
};
painter->drawPolyline(start_line, 3);
} else if (fd->num > setup_frame && fd->num < last_frame) {
painter->save();
if (conv_ != record->conversation()) {
QPen other_pen(line_pen);
other_pen.setStyle(Qt::DashLine);
painter->setPen(other_pen);
}
painter->drawLine(0, 0, 0, height);
painter->restore();
} else if (fd->num == last_frame) {
QPoint end_line[] = {
QPoint(en_w - 1, height / 2),
QPoint(0, height / 2),
QPoint(0, 0)
};
painter->drawPolyline(end_line, 3);
}
}
// Related packet indicator. Rightward arrow for requests, leftward
// arrow for responses, circle for others.
// XXX These are comically oversized when we have multi-line rows.
if (related_frames_.contains(fd->num)) {
painter->setBrush(fg);
switch (related_frames_[fd->num]) {
// Request and response arrows are moved forward one pixel in order to
// maximize white space between the heads and the conversation line.
case FT_FRAMENUM_REQUEST:
{
int hh = height / 2;
QPoint tail(2 - en_w, hh);
QPoint head(en_w, hh);
drawArrow(painter, tail, head, hh / 2);
break;
}
case FT_FRAMENUM_RESPONSE:
{
int hh = height / 2;
QPoint tail(en_w - 1, hh);
QPoint head(1 - en_w, hh);
drawArrow(painter, tail, head, hh / 2);
break;
}
case FT_FRAMENUM_ACK:
{
QRect bbox (2 - en_w, height / 3, em_w - 2, height / 2);
drawCheckMark(painter, bbox);
break;
}
case FT_FRAMENUM_DUP_ACK:
{
QRect bbox (2 - en_w, (height / 3) - (line_w * 2), em_w - 2, height / 2);
drawCheckMark(painter, bbox);
bbox.moveTop(bbox.top() + (line_w * 3));
drawCheckMark(painter, bbox);
break;
}
case FT_FRAMENUM_NONE:
default:
painter->drawEllipse(QPointF(0.0, option_vi.rect.height() / 2), 2, 2);
}
}
painter->restore();
}
