X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=pv%2Fview%2Fdecodetrace.cpp;h=c2369e866fbe3b7286c602adc41735ed1c6a579b;hb=cc9a7898ee7afc32e03dbcc991ed7ba722ed8f1b;hp=ab9514cd4e4da34e706c522ecb4244a123a38ad9;hpb=752281db3591fe0eeb2590379b2055b8e05cd14f;p=pulseview.git

diff --git a/pv/view/decodetrace.cpp b/pv/view/decodetrace.cpp
index ab9514cd..c2369e86 100644
--- a/pv/view/decodetrace.cpp
+++ b/pv/view/decodetrace.cpp
@@ -169,7 +169,10 @@ pair<int, int> DecodeTrace::v_extents() const
 {
 	const int row_height = (ViewItemPaintParams::text_height() * 6) / 4;
 
-	return make_pair(-row_height, row_height * max_visible_rows_);
+	// Make an empty decode trace appear symmetrical
+	const int row_count = max(1, max_visible_rows_);
+
+	return make_pair(-row_height, row_height * row_count);
 }
 
 void DecodeTrace::paint_back(QPainter &p, const ViewItemPaintParams &pp)
@@ -195,6 +198,9 @@ void DecodeTrace::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
 		return;
 	}
 
+	// Set default pen to allow for text width calculation
+	p.setPen(Qt::black);
+
 	// Iterate through the rows
 	int y = get_visual_y();
 	pair<uint64_t, uint64_t> sample_range = get_sample_range(
@@ -239,6 +245,9 @@ void DecodeTrace::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
 	// Draw the hatching
 	draw_unresolved_period(p, annotation_height, pp.left(), pp.right());
 
+	if ((int)visible_rows_.size() > max_visible_rows_)
+		owner_->extents_changed(false, true);
+
 	// Update the maximum row count if needed
 	max_visible_rows_ = std::max(max_visible_rows_, (int)visible_rows_.size());
 }