From e081bf3d864d5662716668d6b4adcb0871d11dae Mon Sep 17 00:00:00 2001
From: Soeren Apel <soeren@apelpie.net>
Date: Tue, 29 Dec 2015 23:12:26 +0100
Subject: [PATCH] Make traces non-draggable outside the header area

---
 pv/view/trace.cpp | 11 +++++++++++
 pv/view/trace.hpp |  5 +++++
 pv/view/view.cpp  |  5 +++++
 pv/view/view.hpp  |  2 ++
 4 files changed, 23 insertions(+)

diff --git a/pv/view/trace.cpp b/pv/view/trace.cpp
index f7bba9ff..f7e7ebf2 100644
--- a/pv/view/trace.cpp
+++ b/pv/view/trace.cpp
@@ -80,6 +80,17 @@ void Trace::set_coloured_bg(bool state)
 	coloured_bg_ = state;
 }
 
+bool Trace::is_draggable() const
+{
+	const View *const view = owner_->view();
+	assert(view);
+
+	QPoint cursor_pos = view->mapFromGlobal(QCursor::pos());
+
+	// The signal is draggable only in the header area
+	return (cursor_pos.x() <= view->header_size().width());
+}
+
 void Trace::paint_label(QPainter &p, const QRect &rect, bool hover)
 {
 	const int y = get_visual_y();
diff --git a/pv/view/trace.hpp b/pv/view/trace.hpp
index c9582c61..acaa341a 100644
--- a/pv/view/trace.hpp
+++ b/pv/view/trace.hpp
@@ -81,6 +81,11 @@ public:
 	 */
 	void set_coloured_bg(bool state);
 
+	/**
+	 * Returns true if the item may be dragged/moved.
+	 */
+	bool is_draggable() const;
+
 	/**
 	 * Computes the outline rectangle of the viewport hit-box.
 	 * @param rect the rectangle of the viewport area.
diff --git a/pv/view/view.cpp b/pv/view/view.cpp
index c9b08bf8..124048bd 100644
--- a/pv/view/view.cpp
+++ b/pv/view/view.cpp
@@ -203,6 +203,11 @@ const Viewport* View::viewport() const
 	return viewport_;
 }
 
+const QSize View::header_size() const
+{
+	return header_->sizeHint();
+}
+
 vector< shared_ptr<TimeItem> > View::time_items() const
 {
 	const vector<shared_ptr<Flag>> f(flags());
diff --git a/pv/view/view.hpp b/pv/view/view.hpp
index 635273da..8aa55125 100644
--- a/pv/view/view.hpp
+++ b/pv/view/view.hpp
@@ -95,6 +95,8 @@ public:
 
 	const Viewport* viewport() const;
 
+	const QSize header_size() const;
+
 	/**
 	 * Gets a list of time markers.
 	 */
-- 
2.30.2