Automatically choose the best annotation based on visual width

[pulseview.git] / pv / view / decode / annotation.cpp

diff --git a/pv/view/decode/annotation.cpp b/pv/view/decode/annotation.cpp
index 0cf5bad0dd3f074d429102a644caea80fc8230bd..4ad04f23caf34b155d0f938e18bc7d338de73e16 100644 (file)
--- a/pv/view/decode/annotation.cpp
+++ b/pv/view/decode/annotation.cpp
@@ -79,16 +79,29 @@ void Annotation::paint(QPainter &p, QColor fill, QColor outline,
        p.setBrush(fill);
        p.drawConvexPolygon(pts, countof(pts));
 
-       if (!_annotations.empty())
-       {
-               QRectF rect(start + cap_width, y - h / 2,
-                       end - start - cap_width * 2, h);
-               p.setPen(text_color);
-               p.drawText(rect, Qt::AlignCenter,
-                       p.fontMetrics().elidedText(
-                               _annotations.front(), Qt::ElideRight,
-                               rect.width()));
+       if (_annotations.empty())
+               return;
+
+       QRectF rect(start + cap_width, y - h / 2,
+               end - start - cap_width * 2, h);
+       p.setPen(text_color);
+
+       // Try to find an annotation that will fit
+       QString best_annotation;
+       int best_width = 0;
+
+       BOOST_FOREACH(QString &a, _annotations) {
+               const int w = p.boundingRect(QRectF(), 0, a).width();
+               if (w <= rect.width() && w > best_width)
+                       best_annotation = a, best_width = w;
        }
+
+       if (best_annotation.isEmpty())
+               best_annotation = _annotations.back();
+
+       // If not ellide the last in the list
+       p.drawText(rect, Qt::AlignCenter, p.fontMetrics().elidedText(
+               best_annotation, Qt::ElideRight, rect.width()));
 }
 
 } // namespace decode