X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=pv%2Fviews%2Ftrace%2Fcursorpair.cpp;h=b940090ac8b68861d95ab5e16dec80f630b8cebc;hp=933eb8fff33e0c3aaf2ed255dc2a6e00bc5b8754;hb=66279897e318a2549557054d1204c862f7d99469;hpb=c04f5a29b805e2aa7afa06d80363bad1f5b705f6

diff --git a/pv/views/trace/cursorpair.cpp b/pv/views/trace/cursorpair.cpp
index 933eb8ff..b940090a 100644
--- a/pv/views/trace/cursorpair.cpp
+++ b/pv/views/trace/cursorpair.cpp
@@ -129,19 +129,14 @@ void CursorPair::paint_label(QPainter &p, const QRect &rect, bool hover)
 	const QColor text_color = ViewItem::select_text_color(Cursor::FillColor);
 	p.setPen(text_color);
 
-	QString text = format_string();
-	text_size_ = p.boundingRect(QRectF(), 0, text).size();
-
 	QRectF delta_rect(label_rect(rect));
 	const int radius = delta_rect.height() / 2;
 	QRectF text_rect(delta_rect.intersected(rect).adjusted(radius, 0, -radius, 0));
 
-	if (text_rect.width() < text_size_.width()) {
-		text = "...";
-		text_size_ = p.boundingRect(QRectF(), 0, text).size();
-		label_incomplete_ = true;
-	} else
-		label_incomplete_ = false;
+	QString text = format_string(text_rect.width(),
+		[&p](const QString& s) -> double { return p.boundingRect(QRectF(), 0, s).width(); });
+
+	text_size_ = p.boundingRect(QRectF(), 0, text).size();
 
 	if (selected()) {
 		p.setBrush(Qt::transparent);
@@ -178,17 +173,48 @@ void CursorPair::paint_back(QPainter &p, ViewItemPaintParams &pp)
 	p.drawRect(l, pp.top(), r - l, pp.height());
 }
 
-QString CursorPair::format_string()
+QString CursorPair::format_string(int max_width, std::function<double(const QString&)> query_size)
 {
-	const pv::util::SIPrefix prefix = view_.tick_prefix();
-	const pv::util::Timestamp diff = abs(second_->time() - first_->time());
+	int time_precision = 12;
+	int freq_precision = 12;
 
-	const QString s1 = Ruler::format_time_with_distance(
-		diff, diff, prefix, view_.time_unit(), 12, false);  /* Always use 12 precision digits */
-	const QString s2 = util::format_time_si(
-		1 / diff, pv::util::SIPrefix::unspecified, 4, "Hz", false);
+	QString s = format_string_sub(time_precision, freq_precision);
+
+	// Try full "{time} s / {freq} Hz" format
+	if ((max_width <= 0) || (query_size(s) <= max_width)) {
+		label_incomplete_ = false;
+		return s;
+	}
+
+	label_incomplete_ = true;
+
+	// Gradually reduce time precision to match frequency precision
+	while (time_precision > freq_precision) {
+		time_precision--;
+
+		s = format_string_sub(time_precision, freq_precision);
+		if (query_size(s) <= max_width)
+			return s;
+	}
 
-	return QString("%1 / %2").arg(s1, s2);
+	// Gradually reduce both precisions down to zero
+	while (time_precision > 0) {
+		time_precision--;
+		freq_precision--;
+
+		s = format_string_sub(time_precision, freq_precision);
+		if (query_size(s) <= max_width)
+			return s;
+	}
+
+	// Try no trailing digits and drop the unit to at least display something
+	s = format_string_sub(0, 0, false);
+
+	if (query_size(s) <= max_width)
+		return s;
+
+	// Give up
+	return "...";
 }
 
 pair<float, float> CursorPair::get_cursor_offsets() const
@@ -219,6 +245,27 @@ void CursorPair::on_hover_point_changed(const QWidget* widget, const QPoint& hp)
 		QToolTip::hideText();  // TODO Will break other tooltips when there can be others
 }
 
+QString CursorPair::format_string_sub(int time_precision, int freq_precision, bool show_unit)
+{
+	const pv::util::SIPrefix prefix = view_.tick_prefix();
+	const pv::util::Timestamp diff = abs(second_->time() - first_->time());
+
+	const QString time = Ruler::format_time_with_distance(
+		diff, diff, prefix, (show_unit ? view_.time_unit() : pv::util::TimeUnit::None),
+		time_precision, false);
+
+	// We can only show a frequency when there's a time base
+	if (view_.time_unit() == pv::util::TimeUnit::Time) {
+		const QString freq = util::format_value_si(
+			1 / diff.convert_to<double>(), pv::util::SIPrefix::unspecified,
+			freq_precision, (show_unit ? "Hz" : nullptr), false);
+
+		return QString("%1 / %2").arg(time, freq);
+	} else
+		// In this case, we return the number of samples, really
+		return time;
+}
+
 } // namespace trace
 } // namespace views
 } // namespace pv