More logical arrangement of port matrix inputs and outputs, hopefully;

signal show notionally "flow" from left to bottom or from top to right.
Some layout cleanups.


git-svn-id: svn://localhost/ardour2/branches/3.0@4416 d708f5d6-7413-0410-9779-e7cbd77b26cf

7 files changed, 247 insertions, 110 deletions

diff --git a/gtk2_ardour/port_matrix.cc b/gtk2_ardour/port_matrix.cc
index 1e9227a525..66d9f41be0 100644
--- a/gtk2_ardour/port_matrix.cc
+++ b/gtk2_ardour/port_matrix.cc
@@ -35,7 +35,7 @@ PortMatrix::PortMatrix (ARDOUR::Session& session, ARDOUR::DataType type, bool of
 	: _offer_inputs (offer_inputs),
 	  _port_group_list (session, type, offer_inputs, mask),
 	  _type (type),
-	  _body (this)
+	  _body (this, offer_inputs ? PortMatrixBody::BOTTOM_AND_LEFT : PortMatrixBody::TOP_AND_RIGHT)
 {
 	/* checkbuttons for visibility of groups */
 	Gtk::HBox* visibility_buttons = Gtk::manage (new Gtk::HBox);
diff --git a/gtk2_ardour/port_matrix_body.cc b/gtk2_ardour/port_matrix_body.cc
index d30dca5e85..3a69c4ccf2 100644
--- a/gtk2_ardour/port_matrix_body.cc
+++ b/gtk2_ardour/port_matrix_body.cc
@@ -22,19 +22,16 @@
 #include "port_matrix_body.h"
 #include "port_matrix.h"
 
-PortMatrixBody::PortMatrixBody (PortMatrix* p)
+PortMatrixBody::PortMatrixBody (PortMatrix* p, Arrangement a)
 	: _port_matrix (p),
-	  _column_labels (this),
-	  _row_labels (p, this),
+	  _column_labels (this, a == TOP_AND_RIGHT ? PortMatrixColumnLabels::TOP : PortMatrixColumnLabels::BOTTOM),
+	  _row_labels (p, this, a == BOTTOM_AND_LEFT ? PortMatrixRowLabels::LEFT : PortMatrixRowLabels::RIGHT),
 	  _grid (p, this),
-	  _alloc_width (0),
-	  _alloc_height (0),
-	  _alloc_xdiv (0),
-	  _alloc_ydiv (0),
+	  _arrangement (a),
 	  _xoffset (0),
 	  _yoffset (0)
 {
-
+	modify_bg (Gtk::STATE_NORMAL, Gdk::Color ("#00000"));
 }
 
 
@@ -45,21 +42,17 @@ PortMatrixBody::on_expose_event (GdkEventExpose* event)
 		event->area.x, event->area.y, event->area.width, event->area.height
 		);
 
-	Gdk::Rectangle const col (0, 0, _alloc_width, _alloc_ydiv);
-	Gdk::Rectangle const row (_alloc_xdiv, _alloc_ydiv, _alloc_width - _alloc_xdiv, _alloc_height - _alloc_ydiv);
-	Gdk::Rectangle const grid (0, _alloc_ydiv, _alloc_xdiv, _alloc_height - _alloc_ydiv);
-
 	bool intersects;
 	Gdk::Rectangle r = exposure;
-	r.intersect (col, intersects);
+	r.intersect (_column_labels_rect, intersects);
 
 	if (intersects) {
 		gdk_draw_drawable (
 			get_window()->gobj(),
 			get_style()->get_fg_gc (Gtk::STATE_NORMAL)->gobj(),
 			_column_labels.get_pixmap (get_window()->gobj()),
-			r.get_x() + _xoffset,
-			r.get_y(),
+			r.get_x() - _column_labels_rect.get_x() + _xoffset,
+			r.get_y() - _column_labels_rect.get_y(),
 			r.get_x(),
 			r.get_y(),
 			r.get_width(),
@@ -68,15 +61,15 @@ PortMatrixBody::on_expose_event (GdkEventExpose* event)
 	}
 
 	r = exposure;
-	r.intersect (row, intersects);
+	r.intersect (_row_labels_rect, intersects);
 
 	if (intersects) {
 		gdk_draw_drawable (
 			get_window()->gobj(),
 			get_style()->get_fg_gc (Gtk::STATE_NORMAL)->gobj(),
 			_row_labels.get_pixmap (get_window()->gobj()),
-			r.get_x() - _alloc_xdiv,
-			r.get_y() + _yoffset - _alloc_ydiv,
+			r.get_x() - _row_labels_rect.get_x(),
+			r.get_y() - _row_labels_rect.get_y() + _yoffset,
 			r.get_x(),
 			r.get_y(),
 			r.get_width(),
@@ -85,15 +78,15 @@ PortMatrixBody::on_expose_event (GdkEventExpose* event)
 	}
 
 	r = exposure;
-	r.intersect (grid, intersects);
+	r.intersect (_grid_rect, intersects);
 
 	if (intersects) {
 		gdk_draw_drawable (
 			get_window()->gobj(),
 			get_style()->get_fg_gc (Gtk::STATE_NORMAL)->gobj(),
 			_grid.get_pixmap (get_window()->gobj()),
-			r.get_x() + _xoffset,
-			r.get_y() + _yoffset - _alloc_ydiv,
+			r.get_x() - _grid_rect.get_x() + _xoffset,
+			r.get_y() - _grid_rect.get_y() + _yoffset,
 			r.get_x(),
 			r.get_y(),
 			r.get_width(),
@@ -124,37 +117,100 @@ PortMatrixBody::on_size_allocate (Gtk::Allocation& alloc)
 	_alloc_width = alloc.get_width ();
 	_alloc_height = alloc.get_height ();
 
-	compute_divs ();
+	compute_rectangles ();
 	_port_matrix->setup_scrollbars ();
 }
 
 void
-PortMatrixBody::compute_divs ()
+PortMatrixBody::compute_rectangles ()
 {
+	/* full sizes of components */
 	std::pair<uint32_t, uint32_t> const col = _column_labels.dimensions ();
-	if (_alloc_height > col.second) {
-		/* allocated height is enough for the column labels */
-		_alloc_ydiv = col.second;
-	} else {
-		/* not enough space for the column labels */
-		_alloc_ydiv = _alloc_height;
-	}
-
-	std::pair<uint32_t, uint32_t> const grid = _grid.dimensions ();
 	std::pair<uint32_t, uint32_t> const row = _row_labels.dimensions ();
+	std::pair<uint32_t, uint32_t> const grid = _grid.dimensions ();
+
+	if (_arrangement == TOP_AND_RIGHT) {
+
+		/* build from top left */
+
+		_column_labels_rect.set_x (0);
+		_column_labels_rect.set_y (0);
+		_grid_rect.set_x (0);
+
+		if (_alloc_width > col.first) {
+			_column_labels_rect.set_width (col.first);
+		} else {
+			_column_labels_rect.set_width (_alloc_width);
+		}
+
+		/* move down to y division */
+		
+		uint32_t y = 0;
+		if (_alloc_height > col.second) {
+			y = col.second;
+		} else {
+			y = _alloc_height;
+		}
+
+		_column_labels_rect.set_height (y);
+		_row_labels_rect.set_y (y);
+		_row_labels_rect.set_height (_alloc_height - y);
+		_grid_rect.set_y (y);
+		_grid_rect.set_height (_alloc_height - y);
+
+		/* move right to x division */
+
+		uint32_t x = 0;
+		if (_alloc_width > (grid.first + row.first)) {
+			x = grid.first;
+		} else if (_alloc_width > row.first) {
+			x = _alloc_width - row.first;
+		}
+
+		_grid_rect.set_width (x);
+		_row_labels_rect.set_x (x);
+		_row_labels_rect.set_width (_alloc_width - x);
+			
+
+	} else if (_arrangement == BOTTOM_AND_LEFT) {
+
+		/* build from bottom right */
+
+		/* move left to x division */
+
+		uint32_t x = 0;
+		if (_alloc_width > (grid.first + row.first)) {
+			x = grid.first;
+		} else if (_alloc_width > row.first) {
+			x = _alloc_width - row.first;
+		}
+
+		_grid_rect.set_x (_alloc_width - x);
+		_grid_rect.set_width (x);
+		_column_labels_rect.set_width (std::min (_alloc_width, col.first));
+		_column_labels_rect.set_x (_alloc_width - _column_labels_rect.get_width());
+
+		_row_labels_rect.set_width (std::min (_alloc_width - x, row.first));
+		_row_labels_rect.set_x (_alloc_width - x - _row_labels_rect.get_width());
+
+		/* move up to the y division */
+		
+		uint32_t y = 0;
+		if (_alloc_height > col.second) {
+			y = col.second;
+		} else {
+			y = _alloc_height;
+		}
+
+		_column_labels_rect.set_y (_alloc_height - y);
+		_column_labels_rect.set_height (y);
+
+		_grid_rect.set_height (std::min (grid.second, _alloc_height - y));
+		_grid_rect.set_y (_alloc_height - y - _grid_rect.get_height());
+
+		_row_labels_rect.set_height (_grid_rect.get_height());
+		_row_labels_rect.set_y (_grid_rect.get_y());
 
-	if (_alloc_width > (grid.first + row.first)) {
-		/* allocated width is larger than we need, so
-		   put the x division at the extent of the grid */
-		_alloc_xdiv = grid.first;
-	} else if (_alloc_width > row.first) {
-		/* allocated width is large enough for the row labels
-		   but not for the whole grid, so display the whole
-		   row label section and cut part of the grid off */
-		_alloc_xdiv = _alloc_width - row.first;
-	} else {
-		/* allocated width isn't even enough for the row labels */
-		_alloc_xdiv = 0;
 	}
 }
 
@@ -191,7 +247,7 @@ PortMatrixBody::setup (
 	_row_labels.setup ();
 	_grid.setup ();
 
-	compute_divs ();
+	compute_rectangles ();
 }
 
 uint32_t
@@ -204,7 +260,7 @@ PortMatrixBody::full_scroll_width ()
 uint32_t
 PortMatrixBody::alloc_scroll_width ()
 {
-	return _alloc_xdiv;
+	return _grid_rect.get_width();
 }
 
 uint32_t
@@ -216,7 +272,7 @@ PortMatrixBody::full_scroll_height ()
 uint32_t
 PortMatrixBody::alloc_scroll_height ()
 {
-	return _alloc_height - _alloc_ydiv;
+	return _grid_rect.get_height();
 }
 
 void
@@ -236,12 +292,26 @@ PortMatrixBody::set_yoffset (uint32_t yo)
 bool
 PortMatrixBody::on_button_press_event (GdkEventButton* ev)
 {
-	if (ev->x < _alloc_xdiv && ev->y > _alloc_ydiv) {
-		_grid.button_press (ev->x + _xoffset, ev->y + _yoffset - _alloc_ydiv, ev->button);
-	} else if (ev->x > _alloc_xdiv && ev->y > _alloc_ydiv) {
-		_row_labels.button_press (ev->x - _alloc_xdiv, ev->y + _yoffset - _alloc_ydiv, ev->button, ev->time);
+	if (Gdk::Region (_grid_rect).point_in (ev->x, ev->y)) {
+
+		_grid.button_press (
+			ev->x - _grid_rect.get_x() + _xoffset,
+			ev->y - _grid_rect.get_y() + _yoffset,
+			ev->button
+			);
+
+	} else if (Gdk::Region (_row_labels_rect).point_in (ev->x, ev->y)) {
+
+		_row_labels.button_press (
+			ev->x - _row_labels_rect.get_x(),
+			ev->y - _row_labels_rect.get_y() + _yoffset,
+			ev->button, ev->time
+			);
+	
 	} else {
+	
 		return false;
+		
 	}
 
 	return true;
diff --git a/gtk2_ardour/port_matrix_body.h b/gtk2_ardour/port_matrix_body.h
index 503bb3ab62..bb2d592fe8 100644
--- a/gtk2_ardour/port_matrix_body.h
+++ b/gtk2_ardour/port_matrix_body.h
@@ -33,7 +33,12 @@ class PortMatrix;
 class PortMatrixBody : public Gtk::EventBox
 {
 public:
-	PortMatrixBody (PortMatrix *);
+	enum Arrangement {
+		TOP_AND_RIGHT,
+		BOTTOM_AND_LEFT
+	};
+
+	PortMatrixBody (PortMatrix *, Arrangement);
 
 	/** @return bundles to offer for columns */
 	std::vector<boost::shared_ptr<ARDOUR::Bundle> > const & column_bundles () {
@@ -67,7 +72,7 @@ protected:
 	bool on_button_press_event (GdkEventButton *);
 
 private:
-	void compute_divs ();
+	void compute_rectangles ();
 	void repaint_column_labels ();
 	void repaint_row_labels ();
 	
@@ -76,10 +81,12 @@ private:
 	PortMatrixRowLabels _row_labels;
 	PortMatrixGrid _grid;
 
+	Arrangement _arrangement;
 	uint32_t _alloc_width; ///< allocated width
 	uint32_t _alloc_height; ///< allocated height
-	uint32_t _alloc_xdiv; ///< position of the division between grid and row labels
-	uint32_t _alloc_ydiv; ///< position of the division between column labels and grid
+	Gdk::Rectangle _column_labels_rect;
+	Gdk::Rectangle _row_labels_rect;
+	Gdk::Rectangle _grid_rect;
 	uint32_t _xoffset;
 	uint32_t _yoffset;
 
diff --git a/gtk2_ardour/port_matrix_column_labels.cc b/gtk2_ardour/port_matrix_column_labels.cc
index 343d225b55..90099eb1e5 100644
--- a/gtk2_ardour/port_matrix_column_labels.cc
+++ b/gtk2_ardour/port_matrix_column_labels.cc
@@ -22,10 +22,10 @@
 #include "port_matrix_column_labels.h"
 #include "port_matrix.h"
 
-PortMatrixColumnLabels::PortMatrixColumnLabels (PortMatrixBody* b)
-	: PortMatrixComponent (b)
+PortMatrixColumnLabels::PortMatrixColumnLabels (PortMatrixBody* b, Location l)
+	: PortMatrixComponent (b), _location (l)
 {
-	
+
 }
 
 void
@@ -87,7 +87,7 @@ PortMatrixColumnLabels::compute_dimensions ()
 	_width += _height / tan (angle ());
 }
 
-uint32_t
+double
 PortMatrixColumnLabels::basic_text_x_pos (int c) const
 {
 	return column_width() / 2 +
@@ -105,16 +105,16 @@ PortMatrixColumnLabels::render (cairo_t* cr)
 
         /* BUNDLE PARALLELOGRAM-TYPE-THING AND NAME */
 
-	uint32_t x = 0;
+	double x = 0;
 	for (std::vector<boost::shared_ptr<ARDOUR::Bundle> >::const_iterator i = _body->column_bundles().begin (); i != _body->column_bundles().end(); ++i) {
 
 		Gdk::Color colour = get_a_bundle_colour (i - _body->column_bundles().begin ());
 		set_source_rgb (cr, colour);
 
-		uint32_t const w = (*i)->nchannels() * column_width();
+		double const w = (*i)->nchannels() * column_width();
 
-		uint32_t x_ = x;
-		uint32_t y_ = _height;
+		double x_ = x;
+		double y_ = _height;
 		
 		cairo_move_to (cr, x_, y_);
 		x_ += w;
@@ -132,14 +132,25 @@ PortMatrixColumnLabels::render (cairo_t* cr)
 
 		set_source_rgb (cr, text_colour());
 
-		uint32_t const rl = 3 * name_pad() + _longest_channel_name;
 
-		cairo_move_to (
-			cr,
-			x + basic_text_x_pos (0) + rl * cos (angle()),
-			_height - rl * sin (angle())
-			);
-		
+		if (_location == TOP) {
+			
+			double const rl = 3 * name_pad() + _longest_channel_name;
+			cairo_move_to (
+				cr,
+				x + basic_text_x_pos (0) + rl * cos (angle()),
+				_height - rl * sin (angle())
+				);
+			
+		} else if (_location == BOTTOM) {
+
+			cairo_move_to (
+				cr,
+				x + basic_text_x_pos (0),
+				_height - name_pad() * sin (angle())
+				);
+		}
+			
 		cairo_save (cr);
 		cairo_rotate (cr, -angle());
 		cairo_show_text (cr, (*i)->name().c_str());
@@ -156,21 +167,42 @@ PortMatrixColumnLabels::render (cairo_t* cr)
 		
 		for (uint32_t j = 0; j < (*i)->nchannels(); ++j) {
 
-			uint32_t const p = _longest_channel_name + (2 * name_pad());
-			uint32_t const w = column_width();
-
-			uint32_t x_ = x;
-			uint32_t y_ = _height;
-			cairo_move_to (cr, x_, y_);
-			x_ += w;
-			cairo_line_to (cr, x_, y_);
-			x_ += p * cos (angle());
-			y_ -= p * sin (angle());
- 			cairo_line_to (cr, x_, y_);
- 			x_ -= column_width() * pow (sin (angle()), 2);
- 			y_ -= column_width() * sin (angle()) * cos (angle());
- 			cairo_line_to (cr, x_, y_);
- 			cairo_line_to (cr, x, _height);
+			double const lc = _longest_channel_name + (2 * name_pad());
+			double const lb = _longest_bundle_name + (2 * name_pad());
+			double const w = column_width();
+
+			if (_location == BOTTOM) {
+
+				double x_ = x + _height / tan (angle()) + w;
+				double const ix = x_;
+				double y_ = 0;
+				cairo_move_to (cr, x_, y_);
+				x_ -= w;
+				cairo_line_to (cr, x_, y_);
+				x_ -= lb * cos (angle());
+				y_ += lb * sin (angle());
+				cairo_line_to (cr, x_, y_);
+				x_ += w * pow (sin (angle()), 2);
+				y_ += w * sin (angle()) * cos (angle());
+				cairo_line_to (cr, x_, y_);
+				cairo_line_to (cr, ix, 0);
+
+			} else if (_location == TOP) {
+
+				double x_ = x;
+				double y_ = _height;
+				cairo_move_to (cr, x_, y_);
+				x_ += w;
+				cairo_line_to (cr, x_, y_);
+				x_ += lc * cos (angle());
+				y_ -= lc * sin (angle());
+				cairo_line_to (cr, x_, y_);
+				x_ -= column_width() * pow (sin (angle()), 2);
+				y_ -= column_width() * sin (angle()) * cos (angle());
+				cairo_line_to (cr, x_, y_);
+				cairo_line_to (cr, x, _height);
+
+			}
 
 			Gdk::Color colour = get_a_bundle_colour (i - _body->column_bundles().begin());
 			set_source_rgb (cr, colour);
@@ -180,7 +212,13 @@ PortMatrixColumnLabels::render (cairo_t* cr)
 			cairo_stroke (cr);
 
 			set_source_rgb (cr, text_colour());
-			cairo_move_to (cr, x + basic_text_x_pos(j), _height - name_pad() * sin (angle()));
+
+			if (_location == TOP) {
+				cairo_move_to (cr, x + basic_text_x_pos(j), _height - name_pad() * sin (angle()));
+			} else if (_location == BOTTOM) {
+				double const rl = 3 * name_pad() + _longest_bundle_name;
+				cairo_move_to (cr, x + basic_text_x_pos(j) + rl * cos (angle ()), _height - rl * sin (angle()));
+			}
 			
 			cairo_save (cr);
 			cairo_rotate (cr, -angle());
diff --git a/gtk2_ardour/port_matrix_column_labels.h b/gtk2_ardour/port_matrix_column_labels.h
index 3c9ff41838..76510073ec 100644
--- a/gtk2_ardour/port_matrix_column_labels.h
+++ b/gtk2_ardour/port_matrix_column_labels.h
@@ -33,17 +33,24 @@ namespace ARDOUR {
 class PortMatrixColumnLabels : public PortMatrixComponent
 {
 public:
-	PortMatrixColumnLabels (PortMatrixBody *);
+
+	enum Location {
+		TOP,
+		BOTTOM
+	};
+	
+	PortMatrixColumnLabels (PortMatrixBody *, Location);
 
 private:
 	void render (cairo_t *);
 	void compute_dimensions ();
-	uint32_t basic_text_x_pos (int) const;
+	double basic_text_x_pos (int) const;
 
 	std::vector<boost::shared_ptr<ARDOUR::Bundle> > _bundles;
-	uint32_t _longest_bundle_name;
-	uint32_t _longest_channel_name;
-	uint32_t _highest_text;
+	double _longest_bundle_name;
+	double _longest_channel_name;
+	double _highest_text;
+	Location _location;
 };
 
 #endif
diff --git a/gtk2_ardour/port_matrix_row_labels.cc b/gtk2_ardour/port_matrix_row_labels.cc
index 18e479942e..55c760f441 100644
--- a/gtk2_ardour/port_matrix_row_labels.cc
+++ b/gtk2_ardour/port_matrix_row_labels.cc
@@ -28,8 +28,8 @@
 #include "port_matrix.h"
 #include "i18n.h"
 
-PortMatrixRowLabels::PortMatrixRowLabels (PortMatrix* p, PortMatrixBody* b)
-	: PortMatrixComponent (b), _port_matrix (p), _menu (0)
+PortMatrixRowLabels::PortMatrixRowLabels (PortMatrix* p, PortMatrixBody* b, Location l)
+	: PortMatrixComponent (b), _port_matrix (p), _menu (0), _location (l)
 {
 	
 }
@@ -74,9 +74,7 @@ PortMatrixRowLabels::compute_dimensions ()
 		_height += (*i)->nchannels() * row_height();
 	}
 
-	_width = _longest_port_name +
-		name_pad() * 4 +
-		_longest_bundle_name + name_pad() * 2;
+	_width = _longest_port_name + name_pad() * 4 + _longest_bundle_name;
 }
 
 
@@ -91,20 +89,19 @@ PortMatrixRowLabels::render (cairo_t* cr)
 
 	/* SIDE BUNDLE NAMES */
 
-	uint32_t x = _longest_port_name + name_pad() * 3;
+	uint32_t x;
+	if (_location == LEFT) {
+		x = name_pad();
+	} else if (_location == RIGHT) {
+		x = _longest_port_name + name_pad() * 3;
+	}
 
 	uint32_t y = 0;
 	for (std::vector<boost::shared_ptr<ARDOUR::Bundle> >::const_iterator i = _body->row_bundles().begin(); i != _body->row_bundles().end(); ++i) {
 
 		Gdk::Color const colour = get_a_bundle_colour (i - _body->row_bundles().begin ());
 		set_source_rgb (cr, colour);
-		cairo_rectangle (
-			cr,
-			0,
-			y,
-			_longest_port_name + name_pad() * 4 + _longest_bundle_name + name_pad() * 2,
-			row_height() * (*i)->nchannels()
-			);
+		cairo_rectangle (cr, 0, y, _width, row_height() * (*i)->nchannels());
 		cairo_fill_preserve (cr);
 		set_source_rgb (cr, background_colour());
 		cairo_set_line_width (cr, label_border_width ());
@@ -134,11 +131,18 @@ PortMatrixRowLabels::render (cairo_t* cr)
 	for (std::vector<boost::shared_ptr<ARDOUR::Bundle> >::const_iterator i = _body->row_bundles().begin(); i != _body->row_bundles().end(); ++i) {
 		for (uint32_t j = 0; j < (*i)->nchannels(); ++j) {
 
+			uint32_t x;
+			if (_location == LEFT) {
+				x = _longest_bundle_name + name_pad() * 2;
+			} else if (_location == RIGHT) {
+				x = 0;
+			}
+
 			Gdk::Color const colour = get_a_bundle_colour (i - _body->row_bundles().begin ());
 			set_source_rgb (cr, colour);
 			cairo_rectangle (
 				cr,
-				0,
+				x,
 				y,
 				_longest_port_name + (name_pad() * 2),
 				row_height()
@@ -153,7 +157,7 @@ PortMatrixRowLabels::render (cairo_t* cr)
 			uint32_t const off = (row_height() - ext.height) / 2;
 
 			set_source_rgb (cr, text_colour());
-			cairo_move_to (cr, name_pad(), y + name_pad() + off);
+			cairo_move_to (cr, x + name_pad(), y + name_pad() + off);
 			cairo_show_text (cr, (*i)->channel_name(j).c_str());
 
 			y += row_height();
@@ -164,7 +168,13 @@ PortMatrixRowLabels::render (cairo_t* cr)
 void
 PortMatrixRowLabels::button_press (double x, double y, int b, uint32_t t)
 {
-	if (b == 3 && x < (_longest_port_name + name_pad() * 2) ) {
+	if (b != 3) {
+		return;
+	}
+
+	if ( (_location ==  LEFT && x > (_longest_bundle_name + name_pad() * 2)) ||
+	     (_location == RIGHT && x < (_longest_port_name + name_pad() * 2))
+		) {
 
 		delete _menu;
 		
@@ -172,7 +182,6 @@ PortMatrixRowLabels::button_press (double x, double y, int b, uint32_t t)
 		_menu->set_name ("ArdourContextMenu");
 		
 		Gtk::Menu_Helpers::MenuList& items = _menu->items ();
-
 		
 		uint32_t row = y / row_height ();
 
diff --git a/gtk2_ardour/port_matrix_row_labels.h b/gtk2_ardour/port_matrix_row_labels.h
index 74af1092c2..dd3d2a9348 100644
--- a/gtk2_ardour/port_matrix_row_labels.h
+++ b/gtk2_ardour/port_matrix_row_labels.h
@@ -37,7 +37,12 @@ namespace Gtk {
 class PortMatrixRowLabels : public PortMatrixComponent
 {
 public:
-	PortMatrixRowLabels (PortMatrix *, PortMatrixBody *);
+	enum Location {
+		LEFT,
+		RIGHT
+	};
+	
+	PortMatrixRowLabels (PortMatrix *, PortMatrixBody *, Location);
 	~PortMatrixRowLabels ();
 
 	void button_press (double, double, int, uint32_t);
@@ -52,6 +57,7 @@ private:
 	uint32_t _longest_port_name;
 	uint32_t _longest_bundle_name;
 	Gtk::Menu* _menu;
+	Location _location;
 };
 
 #endif