Fix ExportFormatSpecification copy-c'tor
[ardour.git] / gtk2_ardour / stereo_panner.cc
index 86cb794f7b408e66681eb604df4fdca2a3b8e279..e5b91d39781ca738cb337e81e3c0285134b868ec 100644 (file)
@@ -1,20 +1,19 @@
 /*
-    Copyright (C) 2000-2007 Paul Davis
+  Copyright (C) 2000-2007 Paul Davis
 
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
 
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
 
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
 #include <iostream>
 #include <cmath>
 
 #include <gtkmm/window.h>
+#include <pangomm/layout.h>
 
-#include "pbd/controllable.h"
 #include "pbd/compose.h"
 
 #include "gtkmm2ext/gui_thread.h"
 #include "gtkmm2ext/gtk_ui.h"
 #include "gtkmm2ext/keyboard.h"
+#include "gtkmm2ext/utils.h"
+#include "gtkmm2ext/persistent_tooltip.h"
 
+#include "ardour/pannable.h"
 #include "ardour/panner.h"
+#include "ardour/panner_shell.h"
+
+#include "gtkmm2ext/colors.h"
 
-#include "ardour_ui.h"
-#include "global_signals.h"
 #include "stereo_panner.h"
+#include "stereo_panner_editor.h"
 #include "rgb_macros.h"
 #include "utils.h"
+#include "ui_config.h"
 
-#include "i18n.h"
+#include "pbd/i18n.h"
 
 using namespace std;
 using namespace Gtk;
 using namespace Gtkmm2ext;
+using namespace ARDOUR_UI_UTILS;
 
-static const int pos_box_size = 10;
-static const int lr_box_size = 15;
-static const int step_down = 10;
-static const int top_step = 2;
+using PBD::Controllable;
 
 StereoPanner::ColorScheme StereoPanner::colors[3];
 bool StereoPanner::have_colors = false;
-PBD::Signal0<void> StereoPanner::color_change;
-
-StereoPanner::StereoPanner (boost::shared_ptr<PBD::Controllable> position, boost::shared_ptr<PBD::Controllable> width)
-        : position_control (position)
-        , width_control (width)
-        , dragging (false)
-        , dragging_position (false)
-        , dragging_left (false)
-        , dragging_right (false)
-        , drag_start_x (0)
-        , last_drag_x (0)
-        , accumulated_delta (0)
-        , detented (false)
-        , drag_data_window (0)
-        , drag_data_label (0)
-{
-        if (!have_colors) {
-                set_colors ();
-                have_colors = true;
-        }
-
-        position_control->Changed.connect (connections, invalidator(*this), boost::bind (&StereoPanner::value_change, this), gui_context());
-        width_control->Changed.connect (connections, invalidator(*this), boost::bind (&StereoPanner::value_change, this), gui_context());
-
-        set_tooltip ();
-        set_flags (Gtk::CAN_FOCUS);
-
-        add_events (Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK|
-                    Gdk::KEY_PRESS_MASK|Gdk::KEY_RELEASE_MASK|
-                    Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|
-                    Gdk::SCROLL_MASK|
-                    Gdk::POINTER_MOTION_MASK);
-
-        color_change.connect (connections, invalidator (*this), boost::bind (&DrawingArea::queue_draw, this), gui_context());
-}
 
-StereoPanner::~StereoPanner ()
+Pango::AttrList StereoPanner::panner_font_attributes;
+bool            StereoPanner::have_font = false;
+
+using namespace ARDOUR;
+
+StereoPanner::StereoPanner (boost::shared_ptr<PannerShell> p)
+       : PannerInterface (p->panner())
+       , _panner_shell (p)
+       , position_control (_panner->pannable()->pan_azimuth_control)
+       , width_control (_panner->pannable()->pan_width_control)
+       , dragging_position (false)
+       , dragging_left (false)
+       , dragging_right (false)
+       , drag_start_x (0)
+       , last_drag_x (0)
+       , accumulated_delta (0)
+       , detented (false)
+       , position_binder (position_control)
+       , width_binder (width_control)
+       , _dragging (false)
 {
-        delete drag_data_window;
+       if (!have_colors) {
+               set_colors ();
+               have_colors = true;
+       }
+       if (!have_font) {
+               Pango::FontDescription font;
+               Pango::AttrFontDesc* font_attr;
+               font = Pango::FontDescription (UIConfiguration::instance().get_SmallBoldMonospaceFont());
+               font_attr = new Pango::AttrFontDesc (Pango::Attribute::create_attr_font_desc (font));
+               panner_font_attributes.change(*font_attr);
+               delete font_attr;
+               have_font = true;
+       }
+
+       position_control->Changed.connect (panvalue_connections, invalidator(*this), boost::bind (&StereoPanner::value_change, this), gui_context());
+       width_control->Changed.connect (panvalue_connections, invalidator(*this), boost::bind (&StereoPanner::value_change, this), gui_context());
+
+       _panner_shell->Changed.connect (panshell_connections, invalidator (*this), boost::bind (&StereoPanner::bypass_handler, this), gui_context());
+       _panner_shell->PannableChanged.connect (panshell_connections, invalidator (*this), boost::bind (&StereoPanner::pannable_handler, this), gui_context());
+
+       UIConfiguration::instance().ColorsChanged.connect (sigc::mem_fun (*this, &StereoPanner::color_handler));
+
+       set_tooltip ();
 }
 
-void
-StereoPanner::set_tooltip ()
+StereoPanner::~StereoPanner ()
 {
-        Gtkmm2ext::UI::instance()->set_tip (this, 
-                                            string_compose (_("0 -> set width to zero (mono)\n%1-uparrow -> set width to 100\n%1-downarrow -> set width to -100"), 
-                                                            
-                                                            Keyboard::secondary_modifier_name()).c_str());
-}
 
-void
-StereoPanner::unset_tooltip ()
-{
-        Gtkmm2ext::UI::instance()->set_tip (this, "");
 }
 
 void
-StereoPanner::set_drag_data ()
-{
-        if (!drag_data_label) {
-                return;
-        }
-
-        double pos = position_control->get_value(); // 0..1
-        
-        /* We show the position of the center of the image relative to the left & right.
-           This is expressed as a pair of percentage values that ranges from (100,0) 
-           (hard left) through (50,50) (hard center) to (0,100) (hard right).
-
-           This is pretty wierd, but its the way audio engineers expect it. Just remember that
-           the center of the USA isn't Kansas, its (50LA, 50NY) and it will all make sense.
-        */
-
-        drag_data_label->set_markup (string_compose (_("L:%1 R:%2 Width: %3%%"),
-                                                     (int) rint (100.0 * (1.0 - pos)),
-                                                     (int) rint (100.0 * pos),
-                                                     (int) floor (100.0 * width_control->get_value())));
-}
-
-void
-StereoPanner::value_change ()
+StereoPanner::set_tooltip ()
 {
-        set_drag_data ();
-        queue_draw ();
+       if (_panner_shell->bypassed()) {
+               _tooltip.set_tip (_("bypassed"));
+               return;
+       }
+       double pos = position_control->get_value(); // 0..1
+
+       /* We show the position of the center of the image relative to the left & right.
+          This is expressed as a pair of percentage values that ranges from (100,0)
+          (hard left) through (50,50) (hard center) to (0,100) (hard right).
+
+          This is pretty wierd, but its the way audio engineers expect it. Just remember that
+          the center of the USA isn't Kansas, its (50LA, 50NY) and it will all make sense.
+       */
+
+       char buf[64];
+       snprintf (buf, sizeof (buf), _("L:%3d R:%3d Width:%d%%"), (int) rint (100.0 * (1.0 - pos)),
+                 (int) rint (100.0 * pos),
+                 (int) floor (100.0 * width_control->get_value()));
+       _tooltip.set_tip (buf);
 }
 
 bool
-StereoPanner::on_expose_event (GdkEventExpose* ev)
+StereoPanner::on_expose_event (GdkEventExpose*)
 {
        Glib::RefPtr<Gdk::Window> win (get_window());
        Glib::RefPtr<Gdk::GC> gc (get_style()->get_base_gc (get_state()));
+       Cairo::RefPtr<Cairo::Context> context = get_window()->create_cairo_context();
+       Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create(get_pango_context());
+       layout->set_attributes (panner_font_attributes);
+
+       int tw, th;
+       int width, height;
+       const double pos = position_control->get_value (); /* 0..1 */
+       const double swidth = width_control->get_value (); /* -1..+1 */
+       const double fswidth = fabs (swidth);
+       uint32_t o, f, t, b, r;
+       State state;
+
+       width = get_width();
+       height = get_height ();
+
+       const int step_down = rint(height / 3.5);
+       const double corner_radius = 5.0 * UIConfiguration::instance().get_ui_scale();
+       const int lr_box_size = height - 2 * step_down;
+       const int pos_box_size = (int)(rint(step_down * .8)) | 1;
+       const int top_step = step_down - pos_box_size;
+
+       if (swidth == 0.0) {
+               state = Mono;
+       } else if (swidth < 0.0) {
+               state = Inverted;
+       } else {
+               state = Normal;
+       }
+
+       o = colors[state].outline;
+       f = colors[state].fill;
+       t = colors[state].text;
+       b = colors[state].background;
+       r = colors[state].rule;
+
+       if (_panner_shell->bypassed()) {
+               b  = 0x20202040;
+               f  = 0x404040ff;
+               o  = 0x606060ff;
+               t  = 0x606060ff;
+               r  = 0x606060ff;
+       }
+
+       if (_send_mode) {
+               b = UIConfiguration::instance().color ("send bg");
+               // b = rgba_from_style("SendStripBase",
+               // UINT_RGBA_R(b), UINT_RGBA_G(b), UINT_RGBA_B(b), 255,
+               // "fg");
+       }
+       /* background */
+
+       context->set_source_rgba (UINT_RGBA_R_FLT(b), UINT_RGBA_G_FLT(b), UINT_RGBA_B_FLT(b), UINT_RGBA_A_FLT(b));
+       cairo_rectangle (context->cobj(), 0, 0, width, height);
+       context->fill_preserve ();
+       context->clip();
+
+       /* the usable width is reduced from the real width, because we need space for
+          the two halves of LR boxes that will extend past the actual left/right
+          positions (indicated by the vertical line segment above them).
+       */
+
+       double usable_width = width - lr_box_size;
+
+       /* compute the centers of the L/R boxes based on the current stereo width */
+
+       if (fmod (usable_width,2.0) == 0) {
+               /* even width, but we need odd, so that there is an exact center.
+                  So, offset cairo by 1, and reduce effective width by 1
+               */
+               usable_width -= 1.0;
+               context->translate (1.0, 0.0);
+       }
+
+       const double half_lr_box = lr_box_size/2.0;
+       const double center = rint(half_lr_box + (usable_width * pos));
+       const double pan_spread = rint((fswidth * (usable_width-1.0))/2.0);
+       const double left  = center - pan_spread;
+       const double right = center + pan_spread;
+
+       /* center line */
+       context->set_line_width (1.0);
+       context->move_to ((usable_width + lr_box_size)/2.0, 0);
+       context->rel_line_to (0, height);
+       context->set_source_rgba (UINT_RGBA_R_FLT(r), UINT_RGBA_G_FLT(r), UINT_RGBA_B_FLT(r), UINT_RGBA_A_FLT(r));
+       context->stroke ();
+
+       /* compute & draw the line through the box */
+       context->set_line_width (2);
+       context->set_source_rgba (UINT_RGBA_R_FLT(o), UINT_RGBA_G_FLT(o), UINT_RGBA_B_FLT(o), UINT_RGBA_A_FLT(o));
+       context->move_to (left,  top_step + (pos_box_size/2.0) + step_down + 1.0);
+       context->line_to (left,  top_step + (pos_box_size/2.0));
+       context->line_to (right, top_step + (pos_box_size/2.0));
+       context->line_to (right, top_step + (pos_box_size/2.0) + step_down + 1.0);
+       context->stroke ();
+
+       context->set_line_width (1.0);
+
+       /* left box */
+       if (state != Mono) {
+               rounded_rectangle (context, left - half_lr_box,
+                               half_lr_box+step_down,
+                               lr_box_size, lr_box_size, corner_radius);
+               context->set_source_rgba (UINT_RGBA_R_FLT(f), UINT_RGBA_G_FLT(f), UINT_RGBA_B_FLT(f), UINT_RGBA_A_FLT(f));
+               context->fill_preserve();
+               context->set_source_rgba (UINT_RGBA_R_FLT(o), UINT_RGBA_G_FLT(o), UINT_RGBA_B_FLT(o), UINT_RGBA_A_FLT(o));
+               context->stroke();
+
+               /* add text */
+               context->set_source_rgba (UINT_RGBA_R_FLT(t), UINT_RGBA_G_FLT(t), UINT_RGBA_B_FLT(t), UINT_RGBA_A_FLT(t));
+               if (swidth < 0.0) {
+                       layout->set_text (S_("Panner|R"));
+               } else {
+                       layout->set_text (S_("Panner|L"));
+               }
+               layout->get_pixel_size(tw, th);
+               context->move_to (rint(left - tw/2), rint(lr_box_size + step_down - th/2));
+               pango_cairo_show_layout (context->cobj(), layout->gobj());
+       }
+
+       /* right box */
+       rounded_rectangle (context, right - half_lr_box,
+                       half_lr_box+step_down,
+                       lr_box_size, lr_box_size, corner_radius);
+       context->set_source_rgba (UINT_RGBA_R_FLT(f), UINT_RGBA_G_FLT(f), UINT_RGBA_B_FLT(f), UINT_RGBA_A_FLT(f));
+       context->fill_preserve();
+       context->set_source_rgba (UINT_RGBA_R_FLT(o), UINT_RGBA_G_FLT(o), UINT_RGBA_B_FLT(o), UINT_RGBA_A_FLT(o));
+       context->stroke();
+
+       /* add text */
+       context->set_source_rgba (UINT_RGBA_R_FLT(t), UINT_RGBA_G_FLT(t), UINT_RGBA_B_FLT(t), UINT_RGBA_A_FLT(t));
+
+       if (state == Mono) {
+               layout->set_text (S_("Panner|M"));
+       } else {
+               if (swidth < 0.0) {
+                       layout->set_text (S_("Panner|L"));
+               } else {
+                       layout->set_text (S_("Panner|R"));
+               }
+       }
+       layout->get_pixel_size(tw, th);
+       context->move_to (rint(right - tw/2), rint(lr_box_size + step_down - th/2));
+       pango_cairo_show_layout (context->cobj(), layout->gobj());
+
+       /* draw the central box */
+       context->set_line_width (2.0);
+       context->move_to (center + (pos_box_size/2.0), top_step); /* top right */
+       context->rel_line_to (0.0, pos_box_size); /* lower right */
+       context->rel_line_to (-pos_box_size/2.0, 4.0); /* bottom point */
+       context->rel_line_to (-pos_box_size/2.0, -4.0); /* lower left */
+       context->rel_line_to (0.0, -pos_box_size); /* upper left */
+       context->close_path ();
+
+       context->set_source_rgba (UINT_RGBA_R_FLT(o), UINT_RGBA_G_FLT(o), UINT_RGBA_B_FLT(o), UINT_RGBA_A_FLT(o));
+       context->stroke_preserve ();
+       context->set_source_rgba (UINT_RGBA_R_FLT(f), UINT_RGBA_G_FLT(f), UINT_RGBA_B_FLT(f), UINT_RGBA_A_FLT(f));
+       context->fill ();
 
-        cairo_t* cr = gdk_cairo_create (win->gobj());
-       
-        int width, height;
-        double pos = position_control->get_value (); /* 0..1 */
-        double swidth = width_control->get_value (); /* -1..+1 */
-        double fswidth = fabs (swidth);
-        uint32_t o, f, t, b;
-        State state;
-
-        width = get_width();
-        height = get_height ();
-
-        if (swidth == 0.0) {
-                state = Mono;
-        } else if (swidth < 0.0) {
-                state = Inverted;
-        } else { 
-                state = Normal;
-        }
-
-        o = colors[state].outline;
-        f = colors[state].fill;
-        t = colors[state].text;
-        b = colors[state].background;
-
-        /* background */
-
-        cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(b), UINT_RGBA_G_FLT(b), UINT_RGBA_B_FLT(b), UINT_RGBA_A_FLT(b));
-        cairo_rectangle (cr, 0, 0, width, height);
-        cairo_fill (cr);
-
-        /* the usable width is reduced from the real width, because we need space for 
-           the two halves of LR boxes that will extend past the actual left/right
-           positions (indicated by the vertical line segment above them).
-        */
-
-        double usable_width = width - lr_box_size;
-
-        /* compute the centers of the L/R boxes based on the current stereo width */
-
-        if (fmod (usable_width,2.0) == 0) {
-                /* even width, but we need odd, so that there is an exact center.
-                   So, offset cairo by 1, and reduce effective width by 1 
-                */
-                usable_width -= 1.0;
-                cairo_translate (cr, 1.0, 0.0);
-        }
-
-        double center = (lr_box_size/2.0) + (usable_width * pos);
-        const double pan_spread = (fswidth * usable_width)/2.0;
-        const double half_lr_box = lr_box_size/2.0;
-        int left;
-        int right;
-
-        left = center - pan_spread;  // center of left box
-        right = center + pan_spread; // center of right box
-
-        /* compute & draw the line through the box */
-        
-        cairo_set_line_width (cr, 2);
-        cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(o), UINT_RGBA_G_FLT(o), UINT_RGBA_B_FLT(o), UINT_RGBA_A_FLT(o));
-        cairo_move_to (cr, left, top_step+(pos_box_size/2)+step_down);
-        cairo_line_to (cr, left, top_step+(pos_box_size/2));
-        cairo_line_to (cr, right, top_step+(pos_box_size/2));
-        cairo_line_to (cr, right, top_step+(pos_box_size/2) + step_down);
-        cairo_stroke (cr);
-
-        /* left box */
-
-        cairo_rectangle (cr, 
-                         left - half_lr_box,
-                         half_lr_box+step_down, 
-                         lr_box_size, lr_box_size);
-        cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(o), UINT_RGBA_G_FLT(o), UINT_RGBA_B_FLT(o), UINT_RGBA_A_FLT(o));
-        cairo_stroke_preserve (cr);
-        cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(f), UINT_RGBA_G_FLT(f), UINT_RGBA_B_FLT(f), UINT_RGBA_A_FLT(f));
-       cairo_fill (cr);
-        
-        /* add text */
-
-        cairo_move_to (cr, 
-                       left - half_lr_box + 3,
-                       (lr_box_size/2) + step_down + 13);
-        cairo_select_font_face (cr, "sans-serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
-
-        if (state != Mono) {
-                cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(t), UINT_RGBA_G_FLT(t), UINT_RGBA_B_FLT(t), UINT_RGBA_A_FLT(t));
-                if (swidth < 0.0) {
-                        cairo_show_text (cr, _("R"));
-                } else {
-                        cairo_show_text (cr, _("L"));
-                }
-        }
-
-        /* right box */
-
-        cairo_rectangle (cr, 
-                         right - half_lr_box,
-                         half_lr_box+step_down, 
-                         lr_box_size, lr_box_size);
-        cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(o), UINT_RGBA_G_FLT(o), UINT_RGBA_B_FLT(o), UINT_RGBA_A_FLT(o));
-        cairo_stroke_preserve (cr);
-        cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(f), UINT_RGBA_G_FLT(f), UINT_RGBA_B_FLT(f), UINT_RGBA_A_FLT(f));
-       cairo_fill (cr);
-
-        /* add text */
-
-        cairo_move_to (cr, 
-                       right - half_lr_box + 3,
-                       (lr_box_size/2)+step_down + 13);
-        cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(t), UINT_RGBA_G_FLT(t), UINT_RGBA_B_FLT(t), UINT_RGBA_A_FLT(t));
-
-        if (state == Mono) {
-                cairo_show_text (cr, _("M"));
-        } else {
-                if (swidth < 0.0) {
-                        cairo_show_text (cr, _("L"));
-                } else {
-                        cairo_show_text (cr, _("R"));
-                }
-        }
-
-        /* draw the central box */
-
-        cairo_set_line_width (cr, 1);
-       cairo_rectangle (cr, lrint (center - (pos_box_size/2.0)), top_step, pos_box_size, pos_box_size);
-        cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(o), UINT_RGBA_G_FLT(o), UINT_RGBA_B_FLT(o), UINT_RGBA_A_FLT(o));
-        cairo_stroke_preserve (cr);
-        cairo_set_source_rgba (cr, UINT_RGBA_R_FLT(f), UINT_RGBA_G_FLT(f), UINT_RGBA_B_FLT(f), UINT_RGBA_A_FLT(f));
-       cairo_fill (cr);
-
-        /* done */
-
-        cairo_destroy (cr);
        return true;
 }
 
 bool
 StereoPanner::on_button_press_event (GdkEventButton* ev)
 {
-        drag_start_x = ev->x;
-        last_drag_x = ev->x;
-        
-        dragging_position = false;
-        dragging_left = false;
-        dragging_right = false;
-        dragging = false;
-        accumulated_delta = 0;
-        detented = false;
-
-        if (ev->button != 1) {
-                return false;
-        }
-
-        if (ev->type == GDK_2BUTTON_PRESS) {
-                int width = get_width();
-
-                if (Keyboard::modifier_state_contains (ev->state, Keyboard::TertiaryModifier)) {
-                        /* handled by button release */
-                        return true;
-                }
-
-                if (ev->y < 20) {
-                        
-                        /* upper section: adjusts position, constrained by width */
-
-                        const double w = width_control->get_value ();
-                        const double max_pos = 1.0 - (w/2.0);
-                        const double min_pos = w/2.0;
-
-                        if (ev->x <= width/3) {
-                                /* left side dbl click */
-                                if (Keyboard::modifier_state_contains (ev->state, Keyboard::SecondaryModifier)) {
-                                        /* 2ndary-double click on left, collapse to hard left */
-                                        width_control->set_value (0);
-                                        position_control->set_value (0);
-                                } else {
-                                        position_control->set_value (min_pos);
-                                }
-                        } else if (ev->x > 2*width/3) {
-                                if (Keyboard::modifier_state_contains (ev->state, Keyboard::SecondaryModifier)) {
-                                        /* 2ndary-double click on right, collapse to hard right */
-                                        width_control->set_value (0);
-                                        position_control->set_value (1.0);
-                                }
-                                position_control->set_value (max_pos);
-                        } else {
-                                position_control->set_value (0.5);
-                        }
-
-                } else {
-
-                        /* lower section: adjusts width, constrained by position */
-
-                        const double p = position_control->get_value ();
-                        const double max_width = 2.0 * min ((1.0 - p), p);
-
-                        if (ev->x <= width/3) {
-                                /* left side dbl click */
-                                width_control->set_value (max_width); // reset width to 100%
-                        } else if (ev->x > 2*width/3) {
-                                /* right side dbl click */
-                                width_control->set_value (-max_width); // reset width to inverted 100%
-                        } else {
-                                /* center dbl click */
-                                width_control->set_value (0); // collapse width to 0%
-                        }
-                }
-
-                dragging = false;
-
-        } else if (ev->type == GDK_BUTTON_PRESS) {
-
-                if (Keyboard::modifier_state_contains (ev->state, Keyboard::TertiaryModifier)) {
-                        /* handled by button release */
-                        return true;
-                }
-
-                if (ev->y < 20) {
-                        /* top section of widget is for position drags */
-                        dragging_position = true;
-                } else {
-                        /* lower section is for dragging width */
-                        
-                        double pos = position_control->get_value (); /* 0..1 */
-                        double swidth = width_control->get_value (); /* -1..+1 */
-                        double fswidth = fabs (swidth);
-                        int usable_width = get_width() - lr_box_size;
-                        double center = (lr_box_size/2.0) + (usable_width * pos);
-                        int left = lrint (center - (fswidth * usable_width / 2.0)); // center of leftmost box
-                        int right = lrint (center +  (fswidth * usable_width / 2.0)); // center of rightmost box
-                        const int half_box = lr_box_size/2;
-                        
-                        if (ev->x >= (left - half_box) && ev->x < (left + half_box)) {
-                                dragging_left = true;
-                        } else if (ev->x >= (right - half_box) && ev->x < (right + half_box)) {
-                                dragging_right = true;
-                        }
-                        
-                }
-
-                dragging = true;
-        }
-
-        return true;
+       if (PannerInterface::on_button_press_event (ev)) {
+               return true;
+       }
+
+       if (_panner_shell->bypassed()) {
+               return true;
+       }
+
+       drag_start_x = ev->x;
+       last_drag_x = ev->x;
+
+       dragging_position = false;
+       dragging_left = false;
+       dragging_right = false;
+       _dragging = false;
+       _tooltip.target_stop_drag ();
+       accumulated_delta = 0;
+       detented = false;
+
+       /* Let the binding proxies get first crack at the press event
+        */
+
+       if (ev->y < 20) {
+               if (position_binder.button_press_handler (ev)) {
+                       return true;
+               }
+       } else {
+               if (width_binder.button_press_handler (ev)) {
+                       return true;
+               }
+       }
+
+       if (ev->button != 1) {
+               return false;
+       }
+
+       if (ev->type == GDK_2BUTTON_PRESS) {
+               int width = get_width();
+
+               if (Keyboard::modifier_state_contains (ev->state, Keyboard::TertiaryModifier)) {
+                       /* handled by button release */
+                       return true;
+               }
+
+               if (ev->y < 20) {
+
+                       /* upper section: adjusts position, constrained by width */
+
+                       const double w = fabs (width_control->get_value ());
+                       const double max_pos = 1.0 - (w/2.0);
+                       const double min_pos = w/2.0;
+
+                       if (ev->x <= width/3) {
+                               /* left side dbl click */
+                               if (Keyboard::modifier_state_contains (ev->state, Keyboard::SecondaryModifier)) {
+                                       /* 2ndary-double click on left, collapse to hard left */
+                                       width_control->set_value (0, Controllable::NoGroup);
+                                       position_control->set_value (0, Controllable::NoGroup);
+                               } else {
+                                       position_control->set_value (min_pos, Controllable::NoGroup);
+                               }
+                       } else if (ev->x > 2*width/3) {
+                               if (Keyboard::modifier_state_contains (ev->state, Keyboard::SecondaryModifier)) {
+                                       /* 2ndary-double click on right, collapse to hard right */
+                                       width_control->set_value (0, Controllable::NoGroup);
+                                       position_control->set_value (1.0, Controllable::NoGroup);
+                               } else {
+                                       position_control->set_value (max_pos, Controllable::NoGroup);
+                               }
+                       } else {
+                               position_control->set_value (0.5, Controllable::NoGroup);
+                       }
+
+               } else {
+
+                       /* lower section: adjusts width, constrained by position */
+
+                       const double p = position_control->get_value ();
+                       const double max_width = 2.0 * min ((1.0 - p), p);
+
+                       if (ev->x <= width/3) {
+                               /* left side dbl click */
+                               width_control->set_value (max_width, Controllable::NoGroup); // reset width to 100%
+                       } else if (ev->x > 2*width/3) {
+                               /* right side dbl click */
+                               width_control->set_value (-max_width, Controllable::NoGroup); // reset width to inverted 100%
+                       } else {
+                               /* center dbl click */
+                               width_control->set_value (0, Controllable::NoGroup); // collapse width to 0%
+                       }
+               }
+
+               _dragging = false;
+               _tooltip.target_stop_drag ();
+
+       } else if (ev->type == GDK_BUTTON_PRESS) {
+
+               if (Keyboard::modifier_state_contains (ev->state, Keyboard::TertiaryModifier)) {
+                       /* handled by button release */
+                       return true;
+               }
+
+               if (ev->y < 20) {
+                       /* top section of widget is for position drags */
+                       dragging_position = true;
+                       StartPositionGesture ();
+               } else {
+                       /* lower section is for dragging width */
+
+                       double pos = position_control->get_value (); /* 0..1 */
+                       double swidth = width_control->get_value (); /* -1..+1 */
+                       double fswidth = fabs (swidth);
+                       const int lr_box_size = get_height() - 2 * rint(get_height() / 3.5);
+                       int usable_width = get_width() - lr_box_size;
+                       double center = (lr_box_size/2.0) + (usable_width * pos);
+                       int left = lrint (center - (fswidth * usable_width / 2.0)); // center of leftmost box
+                       int right = lrint (center +  (fswidth * usable_width / 2.0)); // center of rightmost box
+                       const int half_box = lr_box_size/2;
+
+                       if (ev->x >= (left - half_box) && ev->x < (left + half_box)) {
+                               if (swidth < 0.0) {
+                                       dragging_right = true;
+                               } else {
+                                       dragging_left = true;
+                               }
+                       } else if (ev->x >= (right - half_box) && ev->x < (right + half_box)) {
+                               if (swidth < 0.0) {
+                                       dragging_left = true;
+                               } else {
+                                       dragging_right = true;
+                               }
+                       }
+                       StartWidthGesture ();
+               }
+
+               _dragging = true;
+               _tooltip.target_start_drag ();
+       }
+
+       return true;
 }
 
 bool
 StereoPanner::on_button_release_event (GdkEventButton* ev)
 {
-        if (ev->button != 1) {
-                return false;
-        }
-
-        dragging = false;
-        dragging_position = false;
-        dragging_left = false;
-        dragging_right = false;
-        accumulated_delta = 0;
-        detented = false;
-
-        if (drag_data_window) {
-                drag_data_window->hide ();
-        }
-        
-        if (Keyboard::modifier_state_contains (ev->state, Keyboard::TertiaryModifier)) {
-                /* reset to default */
-                position_control->set_value (0.5);
-                width_control->set_value (1.0);
-        }
-
-        set_tooltip ();
-
-        return true;
+       if (PannerInterface::on_button_release_event (ev)) {
+               return true;
+       }
+
+       if (ev->button != 1) {
+               return false;
+       }
+
+       if (_panner_shell->bypassed()) {
+               return false;
+       }
+
+       bool const dp = dragging_position;
+
+       _dragging = false;
+       _tooltip.target_stop_drag ();
+       dragging_position = false;
+       dragging_left = false;
+       dragging_right = false;
+       accumulated_delta = 0;
+       detented = false;
+
+       if (Keyboard::modifier_state_contains (ev->state, Keyboard::TertiaryModifier)) {
+               _panner->reset ();
+       } else {
+               if (dp) {
+                       StopPositionGesture ();
+               } else {
+                       StopWidthGesture ();
+               }
+       }
+
+       return true;
 }
 
 bool
 StereoPanner::on_scroll_event (GdkEventScroll* ev)
 {
-        double one_degree = 1.0/180.0; // one degree as a number from 0..1, since 180 degrees is the full L/R axis
-        double pv = position_control->get_value(); // 0..1.0 ; 0 = left
-        double wv = width_control->get_value(); // 0..1.0 ; 0 = left
-        double step;
-        
-        if (Keyboard::modifier_state_contains (ev->state, Keyboard::PrimaryModifier)) {
-                step = one_degree;
-        } else {
-                step = one_degree * 5.0;
-        }
-
-        switch (ev->direction) {
-        case GDK_SCROLL_LEFT:
-                wv += step;
-                width_control->set_value (wv);
-                break;
-        case GDK_SCROLL_UP:
-                pv -= step;
-                position_control->set_value (pv);
-                break;
-        case GDK_SCROLL_RIGHT:
-                wv -= step;
-                width_control->set_value (wv);
-                break;
-        case GDK_SCROLL_DOWN:
-                pv += step;
-                position_control->set_value (pv);
-                break;
-        }
-
-        return true;
+       double one_degree = 1.0/180.0; // one degree as a number from 0..1, since 180 degrees is the full L/R axis
+       double pv = position_control->get_value(); // 0..1.0 ; 0 = left
+       double wv = width_control->get_value(); // 0..1.0 ; 0 = left
+       double step;
+
+       if (_panner_shell->bypassed()) {
+               return false;
+       }
+
+       if (Keyboard::modifier_state_contains (ev->state, Keyboard::PrimaryModifier)) {
+               step = one_degree;
+       } else {
+               step = one_degree * 5.0;
+       }
+
+       switch (ev->direction) {
+       case GDK_SCROLL_LEFT:
+               wv += step;
+               width_control->set_value (wv, Controllable::NoGroup);
+               break;
+       case GDK_SCROLL_UP:
+               pv -= step;
+               position_control->set_value (pv, Controllable::NoGroup);
+               break;
+       case GDK_SCROLL_RIGHT:
+               wv -= step;
+               width_control->set_value (wv, Controllable::NoGroup);
+               break;
+       case GDK_SCROLL_DOWN:
+               pv += step;
+               position_control->set_value (pv, Controllable::NoGroup);
+               break;
+       }
+
+       return true;
 }
 
 bool
 StereoPanner::on_motion_notify_event (GdkEventMotion* ev)
 {
-        if (!dragging) {
-                return false;
-        }
-
-        if (!drag_data_window) {
-                drag_data_window = new Window (WINDOW_POPUP);
-                drag_data_window->set_position (WIN_POS_MOUSE);
-                drag_data_window->set_decorated (false);
-                
-                drag_data_label = manage (new Label);
-                drag_data_label->set_use_markup (true);
-
-                drag_data_window->set_border_width (6);
-                drag_data_window->add (*drag_data_label);
-                drag_data_label->show ();
-                
-                Window* toplevel = dynamic_cast<Window*> (get_toplevel());
-                if (toplevel) {
-                        drag_data_window->set_transient_for (*toplevel);
-                }
-        }
-
-        if (!drag_data_window->is_visible ()) {
-                /* move the window a little away from the mouse */
-                drag_data_window->move (ev->x_root+30, ev->y_root+30);
-                drag_data_window->present ();
-                unset_tooltip ();
-        }
-
-        int w = get_width();
-        double delta = (ev->x - last_drag_x) / (double) w;
-        
-        if (dragging_left) {
-                delta = -delta;
-        }
-
-        if (dragging_left || dragging_right) {
-
-                /* maintain position as invariant as we change the width */
-
-                double current_width = width_control->get_value ();
-
-                /* create a detent close to the center */
-
-                if (!detented && fabs (current_width) < 0.02) {
-                        detented = true;
-                        /* snap to zero */
-                        width_control->set_value (0);
-                }
-                
-                if (detented) {
-
-                        accumulated_delta += delta;
-
-                        /* have we pulled far enough to escape ? */
-
-                        if (fabs (accumulated_delta) >= 0.025) {
-                                width_control->set_value (current_width + accumulated_delta);
-                                detented = false;
-                                accumulated_delta = false;
-                        }
-                                
-                } else {
-                        width_control->set_value (current_width + delta);
-                }
-
-        } else if (dragging_position) {
-
-                double pv = position_control->get_value(); // 0..1.0 ; 0 = left
-                position_control->set_value (pv + delta);
-        }
-
-        last_drag_x = ev->x;
-        return true;
+       if (_panner_shell->bypassed()) {
+               _dragging = false;
+       }
+       if (!_dragging) {
+               return false;
+       }
+
+       const int lr_box_size = get_height() - 2 * rint(get_height() / 3.5);
+       int usable_width = get_width() - lr_box_size;
+       double delta = (ev->x - last_drag_x) / (double) usable_width;
+       double current_width = width_control->get_value ();
+
+       if (dragging_left) {
+               delta = -delta;
+       }
+
+       if (dragging_left || dragging_right) {
+
+               if (Keyboard::modifier_state_contains (ev->state, Keyboard::SecondaryModifier)) {
+
+                       /* change width and position in a way that keeps the
+                        * other side in the same place
+                        */
+
+                       _panner->freeze ();
+
+                       double pv = position_control->get_value();
+
+                       if (dragging_left) {
+                               position_control->set_value (pv - delta, Controllable::NoGroup);
+                       } else {
+                               position_control->set_value (pv + delta, Controllable::NoGroup);
+                       }
+
+                       if (delta > 0.0) {
+                               /* delta is positive, so we're about to
+                                  increase the width. But we need to increase it
+                                  by twice the required value so that the
+                                  other side remains in place when we set
+                                  the position as well.
+                               */
+                               width_control->set_value (current_width + (delta * 2.0), Controllable::NoGroup);
+                       } else {
+                               width_control->set_value (current_width + delta, Controllable::NoGroup);
+                       }
+
+                       _panner->thaw ();
+
+               } else {
+
+                       /* maintain position as invariant as we change the width */
+
+                       /* create a detent close to the center */
+
+                       if (!detented && fabs (current_width) < 0.02) {
+                               detented = true;
+                               /* snap to zero */
+                               width_control->set_value (0, Controllable::NoGroup);
+                       }
+
+                       if (detented) {
+
+                               accumulated_delta += delta;
+
+                               /* have we pulled far enough to escape ? */
+
+                               if (fabs (accumulated_delta) >= 0.025) {
+                                       width_control->set_value (current_width + accumulated_delta, Controllable::NoGroup);
+                                       detented = false;
+                                       accumulated_delta = false;
+                               }
+
+                       } else {
+                               /* width needs to change by 2 * delta because both L & R move */
+                               width_control->set_value (current_width + (delta * 2.0), Controllable::NoGroup);
+                       }
+               }
+
+       } else if (dragging_position) {
+
+               double pv = position_control->get_value(); // 0..1.0 ; 0 = left
+               position_control->set_value (pv + delta, Controllable::NoGroup);
+       }
+
+       last_drag_x = ev->x;
+       return true;
 }
 
 bool
 StereoPanner::on_key_press_event (GdkEventKey* ev)
 {
-        double one_degree = 1.0/180.0;
-        double pv = position_control->get_value(); // 0..1.0 ; 0 = left
-        double wv = width_control->get_value(); // 0..1.0 ; 0 = left
-        double step;
-
-        if (Keyboard::modifier_state_contains (ev->state, Keyboard::PrimaryModifier)) {
-                step = one_degree;
-        } else {
-                step = one_degree * 5.0;
-        }
-
-        /* up/down control width because we consider pan position more "important"
-           (and thus having higher "sense" priority) than width.
-        */
-
-        switch (ev->keyval) {
-        case GDK_Up:
-                if (Keyboard::modifier_state_equals (ev->state, Keyboard::SecondaryModifier)) {
-                        width_control->set_value (1.0);
-                } else {
-                        width_control->set_value (wv + step);
-                }
-                break;
-        case GDK_Down:
-                if (Keyboard::modifier_state_equals (ev->state, Keyboard::SecondaryModifier)) {
-                        width_control->set_value (-1.0);
-                } else {
-                        width_control->set_value (wv - step);
-                }
-
-        case GDK_Left:
-                pv -= step;
-                position_control->set_value (pv);
-                break;
-        case GDK_Right:
-                pv += step;
-                position_control->set_value (pv);
-                break;
-
-                break;
-        case GDK_0:
-        case GDK_KP_0:
-                width_control->set_value (0.0);
-                break;
-
-        default: 
-                return false;
-        }
-                
-        return true;
+       double one_degree = 1.0/180.0;
+       double pv = position_control->get_value(); // 0..1.0 ; 0 = left
+       double wv = width_control->get_value(); // 0..1.0 ; 0 = left
+       double step;
+
+       if (_panner_shell->bypassed()) {
+               return false;
+       }
+
+       if (Keyboard::modifier_state_contains (ev->state, Keyboard::PrimaryModifier)) {
+               step = one_degree;
+       } else {
+               step = one_degree * 5.0;
+       }
+
+       /* up/down control width because we consider pan position more "important"
+          (and thus having higher "sense" priority) than width.
+       */
+
+       switch (ev->keyval) {
+       case GDK_Up:
+               if (Keyboard::modifier_state_equals (ev->state, Keyboard::SecondaryModifier)) {
+                       width_control->set_value (1.0, Controllable::NoGroup);
+               } else {
+                       width_control->set_value (wv + step, Controllable::NoGroup);
+               }
+               break;
+       case GDK_Down:
+               if (Keyboard::modifier_state_equals (ev->state, Keyboard::SecondaryModifier)) {
+                       width_control->set_value (-1.0, Controllable::NoGroup);
+               } else {
+                       width_control->set_value (wv - step, Controllable::NoGroup);
+               }
+               break;
+
+       case GDK_Left:
+               pv -= step;
+               position_control->set_value (pv, Controllable::NoGroup);
+               break;
+       case GDK_Right:
+               pv += step;
+               position_control->set_value (pv, Controllable::NoGroup);
+               break;
+       case GDK_0:
+       case GDK_KP_0:
+               width_control->set_value (0.0, Controllable::NoGroup);
+               break;
+
+       default:
+               return false;
+       }
+
+       return true;
 }
 
-bool
-StereoPanner::on_key_release_event (GdkEventKey* ev)
+void
+StereoPanner::set_colors ()
 {
-        return false;
+       colors[Normal].fill = UIConfiguration::instance().color_mod ("stereo panner fill", "panner fill");
+       // colors[Normal].outline = UIConfiguration::instance().color ("stereo panner outline");
+       colors[Normal].outline = Gtkmm2ext::HSV (colors[Normal].fill).outline().color ();
+       colors[Normal].text = UIConfiguration::instance().color ("stereo panner text");
+       colors[Normal].background = UIConfiguration::instance().color ("stereo panner bg");
+       colors[Normal].rule = UIConfiguration::instance().color ("stereo panner rule");
+
+       colors[Mono].fill = UIConfiguration::instance().color ("stereo panner mono fill");
+       colors[Mono].outline = UIConfiguration::instance().color ("stereo panner mono outline");
+       colors[Mono].text = UIConfiguration::instance().color ("stereo panner mono text");
+       colors[Mono].background = UIConfiguration::instance().color ("stereo panner mono bg");
+       colors[Mono].rule = UIConfiguration::instance().color ("stereo panner rule");
+
+       colors[Inverted].fill = UIConfiguration::instance().color_mod ("stereo panner inverted fill", "stereo panner inverted");
+       colors[Inverted].outline = UIConfiguration::instance().color ("stereo panner inverted outline");
+       colors[Inverted].text = UIConfiguration::instance().color ("stereo panner inverted text");
+       colors[Inverted].background = UIConfiguration::instance().color_mod ("stereo panner inverted bg", "stereo panner inverted bg");
+       colors[Inverted].rule = UIConfiguration::instance().color ("stereo panner rule");
 }
 
-bool
-StereoPanner::on_enter_notify_event (GdkEventCrossing* ev)
+void
+StereoPanner::color_handler ()
 {
-       grab_focus ();
-       Keyboard::magic_widget_grab_focus ();
-       return false;
+       set_colors ();
+       queue_draw ();
 }
 
-bool
-StereoPanner::on_leave_notify_event (GdkEventCrossing*)
+void
+StereoPanner::bypass_handler ()
 {
-       Keyboard::magic_widget_drop_focus ();
-       return false;
+       queue_draw ();
 }
 
 void
-StereoPanner::set_colors ()
+StereoPanner::pannable_handler ()
+{
+       panvalue_connections.drop_connections();
+       position_control = _panner->pannable()->pan_azimuth_control;
+       width_control = _panner->pannable()->pan_width_control;
+       position_binder.set_controllable(position_control);
+       width_binder.set_controllable(width_control);
+
+       position_control->Changed.connect (panvalue_connections, invalidator(*this), boost::bind (&StereoPanner::value_change, this), gui_context());
+       width_control->Changed.connect (panvalue_connections, invalidator(*this), boost::bind (&StereoPanner::value_change, this), gui_context());
+       queue_draw ();
+}
+
+PannerEditor*
+StereoPanner::editor ()
 {
-        colors[Normal].fill = ARDOUR_UI::config()->canvasvar_StereoPannerFill.get();
-        colors[Normal].outline = ARDOUR_UI::config()->canvasvar_StereoPannerOutline.get();
-        colors[Normal].text = ARDOUR_UI::config()->canvasvar_StereoPannerText.get();
-        colors[Normal].background = ARDOUR_UI::config()->canvasvar_StereoPannerBackground.get();
-
-        colors[Mono].fill = ARDOUR_UI::config()->canvasvar_StereoPannerMonoFill.get();
-        colors[Mono].outline = ARDOUR_UI::config()->canvasvar_StereoPannerMonoOutline.get();
-        colors[Mono].text = ARDOUR_UI::config()->canvasvar_StereoPannerMonoText.get();
-        colors[Mono].background = ARDOUR_UI::config()->canvasvar_StereoPannerMonoBackground.get();
-
-        colors[Inverted].fill = ARDOUR_UI::config()->canvasvar_StereoPannerInvertedFill.get();
-        colors[Inverted].outline = ARDOUR_UI::config()->canvasvar_StereoPannerInvertedOutline.get();
-        colors[Inverted].text = ARDOUR_UI::config()->canvasvar_StereoPannerInvertedText.get();
-        colors[Inverted].background = ARDOUR_UI::config()->canvasvar_StereoPannerInvertedBackground.get();
-
-        color_change (); /* EMIT SIGNAL */
+       return new StereoPannerEditor (this);
 }