From 728fcafc9897d3ffb4a109b6248d88b0945128f5 Mon Sep 17 00:00:00 2001
From: Joel Holdsworth <joel@airwebreathe.org.uk>
Date: Tue, 1 Oct 2013 17:15:24 +0100
Subject: [PATCH] Fixed Header to respect the minimum drag distance

---
 pv/view/header.cpp | 16 ++++++++++++++--
 pv/view/header.h   |  1 +
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/pv/view/header.cpp b/pv/view/header.cpp
index e084ecc9..549b7191 100644
--- a/pv/view/header.cpp
+++ b/pv/view/header.cpp
@@ -41,7 +41,8 @@ namespace pv {
 namespace view {
 
 Header::Header(View &parent) :
-	MarginWidget(parent)
+	MarginWidget(parent),
+	_dragging(false)
 {
 	setMouseTracking(true);
 
@@ -152,6 +153,7 @@ void Header::mouseReleaseEvent(QMouseEvent *event)
 {
 	assert(event);
 	if (event->button() == Qt::LeftButton) {
+		_dragging = false;
 		_drag_traces.clear();
 		_view.normalize_layout();
 	}
@@ -162,8 +164,18 @@ void Header::mouseMoveEvent(QMouseEvent *event)
 	assert(event);
 	_mouse_point = event->pos();
 
+	if (!(event->buttons() & Qt::LeftButton))
+		return;
+
+	if ((event->pos() - _mouse_down_point).manhattanLength() <
+		QApplication::startDragDistance())
+		return;
+
 	// Move the signals if we are dragging
-	if (!_drag_traces.empty()) {
+	if (!_drag_traces.empty())
+	{
+		_dragging = true;
+
 		const int delta = event->pos().y() - _mouse_down_point.y();
 
 		for (std::list<std::pair<boost::weak_ptr<Trace>,
diff --git a/pv/view/header.h b/pv/view/header.h
index 35d5d20f..02422782 100644
--- a/pv/view/header.h
+++ b/pv/view/header.h
@@ -73,6 +73,7 @@ signals:
 private:
 	QPoint _mouse_point;
 	QPoint _mouse_down_point;
+	bool _dragging;
 
 	std::list<std::pair<boost::weak_ptr<Trace>, int> >
 		_drag_traces;
-- 
2.30.2