From 54401bbb93fbbd9b0de4874bf02c24b710643fe7 Mon Sep 17 00:00:00 2001
From: Joel Holdsworth <joel@airwebreathe.org.uk>
Date: Sat, 17 Nov 2012 08:54:39 +0000
Subject: [PATCH] Added initial support for dragging

---
 pv/view/header.cpp | 32 ++++++++++++++++++++++++++++++++
 pv/view/header.h   | 10 ++++++++++
 pv/view/view.cpp   |  9 +++++++++
 pv/view/view.h     |  2 ++
 4 files changed, 53 insertions(+)

diff --git a/pv/view/header.cpp b/pv/view/header.cpp
index 8434e2c8..00c4201c 100644
--- a/pv/view/header.cpp
+++ b/pv/view/header.cpp
@@ -124,13 +124,45 @@ void Header::mousePressEvent(QMouseEvent *event)
 	if(mouse_over_signal)
 		mouse_over_signal->select(!mouse_over_signal->selected());
 
+	if(event->button() & Qt::LeftButton) {
+		_mouse_down_point = event->pos();
+
+		// Save the current signal offsets
+		BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
+			_mouse_down_signal_offsets[s.get()] =
+				s->get_v_offset();
+	}
+
 	update();
 }
 
+void Header::mouseReleaseEvent(QMouseEvent *event)
+{
+	assert(event);
+	if(event->button() == Qt::LeftButton)
+		_mouse_down_signal_offsets.clear();
+}
+
 void Header::mouseMoveEvent(QMouseEvent *event)
 {
 	assert(event);
 	_mouse_point = event->pos();
+
+	// Move the signals if we are dragging
+	if(!_mouse_down_signal_offsets.empty()) {
+		const vector< shared_ptr<Signal> > &sigs =
+			_view.session().get_signals();
+		const int delta = event->pos().y() - _mouse_down_point.y();
+
+		BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
+			if(s->selected())
+				s->set_v_offset(
+					_mouse_down_signal_offsets[s.get()] +
+					delta);
+
+		signals_moved();
+	}
+
 	update();
 }
 
diff --git a/pv/view/header.h b/pv/view/header.h
index e5cd241f..ff058863 100644
--- a/pv/view/header.h
+++ b/pv/view/header.h
@@ -23,6 +23,8 @@
 
 #include <boost/shared_ptr.hpp>
 
+#include <map>
+
 #include <QWidget>
 
 namespace pv {
@@ -48,6 +50,8 @@ private:
 private:
 	void mousePressEvent(QMouseEvent * event);
 
+	void mouseReleaseEvent(QMouseEvent *event);
+
 	void mouseMoveEvent(QMouseEvent *event);
 
 	void leaveEvent(QEvent *event);
@@ -59,10 +63,16 @@ private slots:
 
 	void on_action_set_colour_triggered();
 
+signals:
+	void signals_moved();
+
 private:
 	View &_view;
 
 	QPoint _mouse_point;
+	QPoint _mouse_down_point;
+
+	std::map<const Signal*, int> _mouse_down_signal_offsets;
 
 	boost::shared_ptr<Signal> _context_signal;
 	QAction *_action_set_name;
diff --git a/pv/view/view.cpp b/pv/view/view.cpp
index e36072ef..b6add2ee 100644
--- a/pv/view/view.cpp
+++ b/pv/view/view.cpp
@@ -85,6 +85,9 @@ View::View(SigSession &session, QWidget *parent) :
 	connect(&_cursors.second, SIGNAL(time_changed()),
 		this, SLOT(marker_time_changed()));
 
+	connect(_header, SIGNAL(signals_moved()),
+		this, SLOT(signals_moved()));
+
 	setViewportMargins(LabelMarginWidth, RulerHeight, 0, 0);
 	setViewport(_viewport);
 
@@ -313,5 +316,11 @@ void View::marker_time_changed()
 	_viewport->update();
 }
 
+void View::signals_moved()
+{
+	_header->update();
+	_viewport->update();
+}
+
 } // namespace view
 } // namespace pv
diff --git a/pv/view/view.h b/pv/view/view.h
index 45ccd345..cda0741d 100644
--- a/pv/view/view.h
+++ b/pv/view/view.h
@@ -129,6 +129,8 @@ private slots:
 
 	void marker_time_changed();
 
+	void signals_moved();
+
 private:
 	SigSession &_session;
 
-- 
2.30.2