merge (with conflict fixes) with master (even against rgareus' recommendation)
[ardour.git] / gtk2_ardour / stereo_panner.cc
index 690acbfddaf626b632a0e57a5c213b3aee8b408d..e650338af45e70277ae3843deca8d4d94ca6b9d3 100644 (file)
@@ -22,6 +22,7 @@
 #include <cmath>
 
 #include <gtkmm/window.h>
+#include <pangomm/layout.h>
 
 #include "pbd/controllable.h"
 #include "pbd/compose.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 "ardour_ui.h"
 #include "global_signals.h"
 #include "stereo_panner.h"
+#include "stereo_panner_editor.h"
 #include "rgb_macros.h"
 #include "utils.h"
 
@@ -54,13 +58,16 @@ static const int top_step = 2;
 StereoPanner::ColorScheme StereoPanner::colors[3];
 bool StereoPanner::have_colors = false;
 
+Pango::AttrList StereoPanner::panner_font_attributes;
+bool            StereoPanner::have_font = false;
+
 using namespace ARDOUR;
 
-StereoPanner::StereoPanner (boost::shared_ptr<Panner> panner)
-       : _panner (panner)
+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 (false)
        , dragging_position (false)
        , dragging_left (false)
        , dragging_right (false)
@@ -68,42 +75,47 @@ StereoPanner::StereoPanner (boost::shared_ptr<Panner> panner)
        , last_drag_x (0)
        , accumulated_delta (0)
        , detented (false)
-       , drag_data_window (0)
-       , drag_data_label (0)
        , position_binder (position_control)
        , width_binder (width_control)
+       , _dragging (false)
 {
        if (!have_colors) {
                set_colors ();
                have_colors = true;
        }
+       if (!have_font) {
+               Pango::FontDescription font;
+               Pango::AttrFontDesc* font_attr;
+               font = Pango::FontDescription ("ArdourMono");
+               font.set_weight (Pango::WEIGHT_BOLD);
+               font.set_size(9 * PANGO_SCALE);
+               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 (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_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);
+       _panner_shell->Changed.connect (connections, invalidator (*this), boost::bind (&StereoPanner::bypass_handler, this), gui_context());
 
        ColorsChanged.connect (sigc::mem_fun (*this, &StereoPanner::color_handler));
+
+       set_tooltip ();
 }
 
 StereoPanner::~StereoPanner ()
 {
-       delete drag_data_window;
+
 }
 
 void
-StereoPanner::set_drag_data ()
+StereoPanner::set_tooltip ()
 {
-       if (!drag_data_label) {
+       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.
@@ -115,33 +127,29 @@ StereoPanner::set_drag_data ()
        */
 
        char buf[64];
-       snprintf (buf, sizeof (buf), "L:%3d R:%3d Width:%d%%", (int) rint (100.0 * (1.0 - pos)),
+       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()));
-       drag_data_label->set_markup (buf);
-}
-
-void
-StereoPanner::value_change ()
-{
-       set_drag_data ();
-       queue_draw ();
+       _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;
-       double pos = position_control->get_value (); /* 0..1 */
-       double swidth = width_control->get_value (); /* -1..+1 */
-       double fswidth = fabs (swidth);
+       const double pos = position_control->get_value (); /* 0..1 */
+       const double swidth = width_control->get_value (); /* -1..+1 */
+       const double fswidth = fabs (swidth);
+       const double corner_radius = 5.0;
        uint32_t o, f, t, b, r;
        State state;
-       const double corner_radius = 5.0;
 
        width = get_width();
        height = get_height ();
@@ -160,11 +168,20 @@ StereoPanner::on_expose_event (GdkEventExpose* ev)
        b = colors[state].background;
        r = colors[state].rule;
 
+       if (_panner_shell->bypassed()) {
+               b  = 0x20202040;
+               f  = 0x404040ff;
+               o  = 0x606060ff;
+               t  = 0x606060ff;
+               r  = 0x606060ff;
+       }
+
        /* 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));
-       rounded_rectangle (context, 0, 0, width, height, corner_radius);
-       context->fill ();
+       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
@@ -183,17 +200,13 @@ StereoPanner::on_expose_event (GdkEventExpose* ev)
                context->translate (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
+       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);
@@ -201,67 +214,64 @@ StereoPanner::on_expose_event (GdkEventExpose* ev)
        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);
-       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);
+       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 ();
 
-       /* left box */
-
-       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(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 ();
-
-       /* add text */
-
-       context->move_to (left - half_lr_box + 3,
-                         (lr_box_size/2) + step_down + 13);
-       context->select_font_face ("sans-serif", Cairo::FONT_SLANT_NORMAL, Cairo::FONT_WEIGHT_BOLD);
+       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) {
-                       context->show_text (_("R"));
+                       layout->set_text (_("R"));
                } else {
-                       context->show_text (_("L"));
+                       layout->set_text (_("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(o), UINT_RGBA_G_FLT(o), UINT_RGBA_B_FLT(o), UINT_RGBA_A_FLT(o));
-       context->stroke_preserve ();
+                       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 ();
+       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->move_to (right - half_lr_box + 3, (lr_box_size/2)+step_down + 13);
        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) {
-               context->show_text (_("M"));
+               layout->set_text (_("M"));
        } else {
                if (swidth < 0.0) {
-                       context->show_text (_("L"));
+                       layout->set_text (_("L"));
                } else {
-                       context->show_text (_("R"));
+                       layout->set_text (_("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 */
@@ -281,13 +291,22 @@ StereoPanner::on_expose_event (GdkEventExpose* ev)
 bool
 StereoPanner::on_button_press_event (GdkEventButton* ev)
 {
+       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;
+       _dragging = false;
+       _tooltip.target_stop_drag ();
        accumulated_delta = 0;
        detented = false;
 
@@ -364,7 +383,8 @@ StereoPanner::on_button_press_event (GdkEventButton* ev)
                        }
                }
 
-               dragging = false;
+               _dragging = false;
+               _tooltip.target_stop_drag ();
 
        } else if (ev->type == GDK_BUTTON_PRESS) {
 
@@ -405,7 +425,8 @@ StereoPanner::on_button_press_event (GdkEventButton* ev)
                        StartWidthGesture ();
                }
 
-               dragging = true;
+               _dragging = true;
+               _tooltip.target_start_drag ();
        }
 
        return true;
@@ -414,27 +435,30 @@ StereoPanner::on_button_press_event (GdkEventButton* ev)
 bool
 StereoPanner::on_button_release_event (GdkEventButton* ev)
 {
+       if (PannerInterface::on_button_release_event (ev)) {
+               return true;
+       }
+       
        if (ev->button != 1) {
                return false;
        }
 
-       bool dp = dragging_position;
+       if (_panner_shell->bypassed()) {
+               return false;
+       }
+
+       bool const dp = dragging_position;
 
-       dragging = false;
+       _dragging = false;
+       _tooltip.target_stop_drag ();
        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);
+               _panner->reset ();
        } else {
                if (dp) {
                        StopPositionGesture ();
@@ -454,6 +478,10 @@ StereoPanner::on_scroll_event (GdkEventScroll* ev)
        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 {
@@ -485,72 +513,81 @@ StereoPanner::on_scroll_event (GdkEventScroll* ev)
 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_name (X_("ContrastingPopup"));
-               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 (_panner_shell->bypassed()) {
+               _dragging = false;
        }
-
-       if (!drag_data_window->is_visible ()) {
-               /* move the popup window vertically down from the panner display */
-               int rx, ry;
-               get_window()->get_origin (rx, ry);
-               drag_data_window->move (rx, ry+get_height());
-               drag_data_window->present ();
+       if (!_dragging) {
+               return false;
        }
 
-       int w = get_width();
-       double delta = (ev->x - last_drag_x) / (double) w;
+       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) {
 
-               /* maintain position as invariant as we change the width */
+               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
+                        */
 
-               /* create a detent close to the center */
+                       _panner->freeze ();
+                       
+                       double pv = position_control->get_value();
 
-               if (!detented && fabs (current_width) < 0.02) {
-                       detented = true;
-                       /* snap to zero */
-                       width_control->set_value (0);
-               }
+                       if (dragging_left) {
+                               position_control->set_value (pv - delta);
+                       } else {
+                               position_control->set_value (pv + delta);
+                       }
 
-               if (detented) {
+                       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));
+                       } else {
+                               width_control->set_value (current_width + delta);
+                       }
 
-                       accumulated_delta += delta;
+                       _panner->thaw ();
 
-                       /* have we pulled far enough to escape ? */
+               } else {
 
-                       if (fabs (accumulated_delta) >= 0.025) {
-                               width_control->set_value (current_width + accumulated_delta);
-                               detented = false;
-                               accumulated_delta = false;
+                       /* 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);
+                       }
+                       
+                       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 needs to change by 2 * delta because both L & R move */
+                               width_control->set_value (current_width + (delta * 2.0));
                        }
-
-               } else {
-                       width_control->set_value (current_width + delta);
                }
 
        } else if (dragging_position) {
@@ -571,6 +608,10 @@ StereoPanner::on_key_press_event (GdkEventKey* ev)
        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 {
@@ -595,6 +636,7 @@ StereoPanner::on_key_press_event (GdkEventKey* ev)
                } else {
                        width_control->set_value (wv - step);
                }
+               break;
 
        case GDK_Left:
                pv -= step;
@@ -604,8 +646,6 @@ StereoPanner::on_key_press_event (GdkEventKey* ev)
                pv += step;
                position_control->set_value (pv);
                break;
-
-               break;
        case GDK_0:
        case GDK_KP_0:
                width_control->set_value (0.0);
@@ -618,52 +658,43 @@ StereoPanner::on_key_press_event (GdkEventKey* ev)
        return true;
 }
 
-bool
-StereoPanner::on_key_release_event (GdkEventKey*)
-{
-       return false;
-}
-
-bool
-StereoPanner::on_enter_notify_event (GdkEventCrossing*)
+void
+StereoPanner::set_colors ()
 {
-       grab_focus ();
-       Keyboard::magic_widget_grab_focus ();
-       return false;
+       colors[Normal].fill = ARDOUR_UI::config()->get_canvasvar_StereoPannerFill();
+       colors[Normal].outline = ARDOUR_UI::config()->get_canvasvar_StereoPannerOutline();
+       colors[Normal].text = ARDOUR_UI::config()->get_canvasvar_StereoPannerText();
+       colors[Normal].background = ARDOUR_UI::config()->get_canvasvar_StereoPannerBackground();
+       colors[Normal].rule = ARDOUR_UI::config()->get_canvasvar_StereoPannerRule();
+
+       colors[Mono].fill = ARDOUR_UI::config()->get_canvasvar_StereoPannerMonoFill();
+       colors[Mono].outline = ARDOUR_UI::config()->get_canvasvar_StereoPannerMonoOutline();
+       colors[Mono].text = ARDOUR_UI::config()->get_canvasvar_StereoPannerMonoText();
+       colors[Mono].background = ARDOUR_UI::config()->get_canvasvar_StereoPannerMonoBackground();
+       colors[Mono].rule = ARDOUR_UI::config()->get_canvasvar_StereoPannerRule();
+
+       colors[Inverted].fill = ARDOUR_UI::config()->get_canvasvar_StereoPannerInvertedFill();
+       colors[Inverted].outline = ARDOUR_UI::config()->get_canvasvar_StereoPannerInvertedOutline();
+       colors[Inverted].text = ARDOUR_UI::config()->get_canvasvar_StereoPannerInvertedText();
+       colors[Inverted].background = ARDOUR_UI::config()->get_canvasvar_StereoPannerInvertedBackground();
+       colors[Inverted].rule = ARDOUR_UI::config()->get_canvasvar_StereoPannerRule();
 }
 
-bool
-StereoPanner::on_leave_notify_event (GdkEventCrossing*)
+void
+StereoPanner::color_handler ()
 {
-       Keyboard::magic_widget_drop_focus ();
-       return false;
+       set_colors ();
+       queue_draw ();
 }
 
 void
-StereoPanner::set_colors ()
+StereoPanner::bypass_handler ()
 {
-       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[Normal].rule = ARDOUR_UI::config()->canvasvar_StereoPannerRule.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[Mono].rule = ARDOUR_UI::config()->canvasvar_StereoPannerRule.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();
-       colors[Inverted].rule = ARDOUR_UI::config()->canvasvar_StereoPannerRule.get();
+       queue_draw ();
 }
 
-void
-StereoPanner::color_handler ()
+PannerEditor*
+StereoPanner::editor ()
 {
-       set_colors ();
-       queue_draw ();
+       return new StereoPannerEditor (this);
 }