From 5139748b422db3a22ceed92894596873e868d676 Mon Sep 17 00:00:00 2001
From: Joel Holdsworth <joel@airwebreathe.org.uk>
Date: Sat, 20 Apr 2013 14:25:46 +0100
Subject: [PATCH] Added Cursors Delta display

---
 pv/view/cursor.cpp     |  2 +-
 pv/view/cursor.h       |  2 +-
 pv/view/cursorpair.cpp | 53 ++++++++++++++++++++++++++++++++++++++++++
 pv/view/cursorpair.h   |  9 +++++++
 4 files changed, 64 insertions(+), 2 deletions(-)

diff --git a/pv/view/cursor.cpp b/pv/view/cursor.cpp
index 809a0501..b55d11e0 100644
--- a/pv/view/cursor.cpp
+++ b/pv/view/cursor.cpp
@@ -60,7 +60,7 @@ QRectF Cursor::get_label_rect(const QRect &rect) const
 		_text_size.height() + View::LabelPadding.height() * 2);
 	const float top = rect.height() - label_size.height() -
 		Cursor::Offset - Cursor::ArrowSize - 0.5f;
-	const float height = label_size.height() + 1;
+	const float height = label_size.height();
 
 	if (_time > _other.time())
 		return QRectF(x, top, label_size.width(), height);
diff --git a/pv/view/cursor.h b/pv/view/cursor.h
index 4c0c35dd..48bf7a0e 100644
--- a/pv/view/cursor.h
+++ b/pv/view/cursor.h
@@ -34,7 +34,7 @@ class Cursor : public TimeMarker
 {
 	Q_OBJECT
 
-private:
+public:
 	static const QColor LineColour;
 	static const QColor FillColour;
 	static const QColor HighlightColour;
diff --git a/pv/view/cursorpair.cpp b/pv/view/cursorpair.cpp
index 5ce398a0..d8af3d76 100644
--- a/pv/view/cursorpair.cpp
+++ b/pv/view/cursorpair.cpp
@@ -20,6 +20,7 @@
 
 #include "cursorpair.h"
 
+#include "ruler.h"
 #include "view.h"
 
 #include <algorithm>
@@ -29,6 +30,8 @@ using namespace std;
 namespace pv {
 namespace view {
 
+const int CursorPair::DeltaPadding = 8;
+
 CursorPair::CursorPair(const View &view) :
 	_first(view, 0.0, _second),
 	_second(view, 1.0, _first),
@@ -56,9 +59,53 @@ Cursor& CursorPair::second()
 	return _second;
 }
 
+QRectF CursorPair::get_label_rect(const QRect &rect) const
+{
+	const QSizeF label_size(
+		_text_size.width() + View::LabelPadding.width() * 2,
+		_text_size.height() + View::LabelPadding.height() * 2);
+	const pair<float, float> offsets(get_cursor_offsets());
+	const pair<float, float> normal_offsets(
+		(offsets.first < offsets.second) ? offsets :
+		make_pair(offsets.second, offsets.first));
+
+	const float height = label_size.height();
+	const float left = max(normal_offsets.first + DeltaPadding, -height);
+	const float right = min(normal_offsets.second - DeltaPadding,
+		(float)rect.width() + height);
+
+	return QRectF(left, rect.height() - label_size.height() -
+		Cursor::ArrowSize - Cursor::Offset - 0.5f,
+		right - left, height);
+}
+
 void CursorPair::draw_markers(QPainter &p,
 	const QRect &rect, unsigned int prefix)
 {
+	compute_text_size(p, prefix);
+	QRectF delta_rect(get_label_rect(rect));
+
+	const int radius = delta_rect.height() / 2;
+	const QRectF text_rect(delta_rect.intersected(
+		rect).adjusted(radius, 0, -radius, 0));
+	if(text_rect.width() >= _text_size.width())
+	{
+		const int highlight_radius = delta_rect.height() / 2 - 2;
+
+		p.setBrush(Cursor::FillColour);
+		p.setPen(Cursor::LineColour);
+		p.drawRoundedRect(delta_rect, radius, radius);
+
+		delta_rect.adjust(1, 1, -1, -1);
+		p.setPen(Cursor::HighlightColour);
+		p.drawRoundedRect(delta_rect, highlight_radius, highlight_radius);
+
+		p.setPen(Cursor::TextColour);
+		p.drawText(text_rect, Qt::AlignCenter | Qt::AlignVCenter,
+			Ruler::format_time(_second.time() - _first.time(), prefix, 2));
+	}
+
+	// Paint the cursor markers
 	_first.paint_label(p, rect, prefix);
 	_second.paint_label(p, rect, prefix);
 }
@@ -85,6 +132,12 @@ void CursorPair::draw_viewport_foreground(QPainter &p,
 	_second.paint(p, rect);
 }
 
+void CursorPair::compute_text_size(QPainter &p, unsigned int prefix)
+{
+	_text_size = p.boundingRect(QRectF(), 0, Ruler::format_time(
+		_second.time() - _first.time(), prefix, 2)).size();
+}
+
 pair<float, float> CursorPair::get_cursor_offsets() const
 {
 	return pair<float, float>(
diff --git a/pv/view/cursorpair.h b/pv/view/cursorpair.h
index b152b808..42e6e51f 100644
--- a/pv/view/cursorpair.h
+++ b/pv/view/cursorpair.h
@@ -32,6 +32,9 @@ namespace view {
 
 class CursorPair
 {
+private:
+	static const int DeltaPadding;
+
 public:
 	/**
 	 * Constructor.
@@ -60,6 +63,8 @@ public:
 	const Cursor& second() const;
 
 public:
+	QRectF get_label_rect(const QRect &rect) const;
+
 	void draw_markers(QPainter &p,
 		const QRect &rect, unsigned int prefix);
 
@@ -67,11 +72,15 @@ public:
 
 	void draw_viewport_foreground(QPainter &p, const QRect &rect);
 
+	void compute_text_size(QPainter &p, unsigned int prefix);
+
 	std::pair<float, float> get_cursor_offsets() const;
 
 private:
 	Cursor _first, _second;
 	const View &_view;
+
+	QSizeF _text_size;
 };
 
 } // namespace view
-- 
2.30.2