src/wx/audio_mapping_view.cc

   1 /*
   2     Copyright (C) 2013-2019 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 /** @file  src/wx/audio_mapping_view.cc
  22  *  @brief AudioMappingView class and helpers.
  23  */
  24
  25 #include "audio_mapping_view.h"
  26 #include "wx_util.h"
  27 #include "audio_gain_dialog.h"
  28 #include "lib/audio_mapping.h"
  29 #include "lib/util.h"
  30 #include <dcp/locale_convert.h>
  31 #include <dcp/types.h>
  32 #include <wx/wx.h>
  33 #include <wx/renderer.h>
  34 #include <wx/grid.h>
  35 #include <wx/graphics.h>
  36 #include <boost/foreach.hpp>
  37 #include <iostream>
  38
  39 using std::cout;
  40 using std::list;
  41 using std::string;
  42 using std::min;
  43 using std::max;
  44 using std::vector;
  45 using std::pair;
  46 using std::make_pair;
  47 using boost::shared_ptr;
  48 using boost::optional;
  49 using dcp::locale_convert;
  50
  51 #define INDICATOR_SIZE 20
  52 #define GRID_SPACING 32
  53 #define LEFT_WIDTH (GRID_SPACING * 3)
  54 #define TOP_HEIGHT (GRID_SPACING * 2)
  55
  56 enum {
  57         ID_off = 1,
  58         ID_full = 2,
  59         ID_minus6dB = 3,
  60         ID_edit = 4
  61 };
  62
  63 AudioMappingView::AudioMappingView (wxWindow* parent)
  64         : wxPanel (parent, wxID_ANY)
  65         , _menu_input (0)
  66         , _menu_output (1)
  67 {
  68         _menu = new wxMenu;
  69         _menu->Append (ID_off, _("Off"));
  70         _menu->Append (ID_full, _("Full"));
  71         _menu->Append (ID_minus6dB, _("-6dB"));
  72         _menu->Append (ID_edit, _("Edit..."));
  73
  74         _body = new wxPanel (this, wxID_ANY);
  75         _vertical_scroll = new wxScrollBar (this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxSB_VERTICAL);
  76         _horizontal_scroll = new wxScrollBar (this, wxID_ANY);
  77
  78 #ifndef __WXOSX__
  79         SetDoubleBuffered (true);
  80 #endif
  81
  82         Bind (wxEVT_SIZE, boost::bind(&AudioMappingView::size, this, _1));
  83         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::off, this), ID_off);
  84         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::full, this), ID_full);
  85         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::minus6dB, this), ID_minus6dB);
  86         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::edit, this), ID_edit);
  87         Bind (wxEVT_MOUSEWHEEL, boost::bind(&AudioMappingView::mouse_wheel, this, _1));
  88         _body->Bind (wxEVT_PAINT, boost::bind(&AudioMappingView::paint, this));
  89         _body->Bind (wxEVT_LEFT_DOWN, boost::bind(&AudioMappingView::left_down, this, _1));
  90         _body->Bind (wxEVT_RIGHT_DOWN, boost::bind(&AudioMappingView::right_down, this, _1));
  91         _body->Bind (wxEVT_MOTION, boost::bind(&AudioMappingView::motion, this, _1));
  92         _vertical_scroll->Bind (wxEVT_SCROLL_TOP, boost::bind(&AudioMappingView::scroll, this));
  93         _vertical_scroll->Bind (wxEVT_SCROLL_BOTTOM, boost::bind(&AudioMappingView::scroll, this));
  94         _vertical_scroll->Bind (wxEVT_SCROLL_LINEUP, boost::bind(&AudioMappingView::scroll, this));
  95         _vertical_scroll->Bind (wxEVT_SCROLL_LINEDOWN, boost::bind(&AudioMappingView::scroll, this));
  96         _vertical_scroll->Bind (wxEVT_SCROLL_PAGEUP, boost::bind(&AudioMappingView::scroll, this));
  97         _vertical_scroll->Bind (wxEVT_SCROLL_PAGEDOWN, boost::bind(&AudioMappingView::scroll, this));
  98         _vertical_scroll->Bind (wxEVT_SCROLL_THUMBTRACK, boost::bind(&AudioMappingView::scroll, this));
  99         _vertical_scroll->Bind (wxEVT_SCROLL_THUMBRELEASE, boost::bind(&AudioMappingView::scroll, this));
 100         _horizontal_scroll->Bind (wxEVT_SCROLL_TOP, boost::bind(&AudioMappingView::scroll, this));
 101         _horizontal_scroll->Bind (wxEVT_SCROLL_BOTTOM, boost::bind(&AudioMappingView::scroll, this));
 102         _horizontal_scroll->Bind (wxEVT_SCROLL_LINEUP, boost::bind(&AudioMappingView::scroll, this));
 103         _horizontal_scroll->Bind (wxEVT_SCROLL_LINEDOWN, boost::bind(&AudioMappingView::scroll, this));
 104         _horizontal_scroll->Bind (wxEVT_SCROLL_PAGEUP, boost::bind(&AudioMappingView::scroll, this));
 105         _horizontal_scroll->Bind (wxEVT_SCROLL_PAGEDOWN, boost::bind(&AudioMappingView::scroll, this));
 106         _horizontal_scroll->Bind (wxEVT_SCROLL_THUMBTRACK, boost::bind(&AudioMappingView::scroll, this));
 107         _horizontal_scroll->Bind (wxEVT_SCROLL_THUMBRELEASE, boost::bind(&AudioMappingView::scroll, this));
 108 }
 109
 110 void
 111 AudioMappingView::size (wxSizeEvent& ev)
 112 {
 113         setup ();
 114         ev.Skip ();
 115 }
 116
 117 void
 118 AudioMappingView::setup ()
 119 {
 120         wxSize const s = GetSize();
 121         int const w = _vertical_scroll->GetSize().GetWidth();
 122         int const h = _horizontal_scroll->GetSize().GetHeight();
 123
 124         _vertical_scroll->SetPosition (wxPoint(s.GetWidth() - w, 0));
 125         _vertical_scroll->SetSize (wxSize(w, max(0, s.GetHeight() - h)));
 126
 127         _body->SetSize (wxSize(max(0, s.GetWidth() - w), max(0, s.GetHeight() - h)));
 128
 129         _horizontal_scroll->SetPosition (wxPoint(0, s.GetHeight() - h));
 130         _horizontal_scroll->SetSize (wxSize(max(0, s.GetWidth() - w), h));
 131
 132         _vertical_scroll->SetScrollbar (
 133                 _vertical_scroll->GetThumbPosition(),
 134                 s.GetHeight() - h - 8,
 135                 GRID_SPACING * (2 + _input_channels.size()),
 136                 GRID_SPACING,
 137                 true
 138                 );
 139
 140         _horizontal_scroll->SetScrollbar (
 141                 _horizontal_scroll->GetThumbPosition(),
 142                 s.GetWidth() - w - 8,
 143                 GRID_SPACING * (3 + _output_channels.size()),
 144                 GRID_SPACING,
 145                 true);
 146 }
 147
 148 void
 149 AudioMappingView::scroll ()
 150 {
 151         Refresh ();
 152 }
 153
 154 void
 155 AudioMappingView::paint_static (wxDC& dc, wxGraphicsContext* gc)
 156 {
 157         gc->SetAntialiasMode (wxANTIALIAS_DEFAULT);
 158         dc.SetFont (wxSWISS_FONT->Bold());
 159         wxCoord label_width;
 160         wxCoord label_height;
 161
 162         /* DCP label at the top */
 163
 164         dc.GetTextExtent (_("DCP"), &label_width, &label_height);
 165         dc.DrawText (_("DCP"), LEFT_WIDTH + (_output_channels.size() * GRID_SPACING - label_width) / 2, (GRID_SPACING - label_height) / 2);
 166
 167         /* Content label on the left */
 168
 169         dc.GetTextExtent (_("Content"), &label_width, &label_height);
 170         dc.DrawRotatedText (
 171                 _("Content"),
 172                 (GRID_SPACING - label_height) / 2,
 173                 TOP_HEIGHT + (_input_channels.size() * GRID_SPACING + label_width) / 2,
 174                 90
 175                 );
 176
 177         dc.SetFont (*wxSWISS_FONT);
 178         gc->SetPen (*wxBLACK_PEN);
 179 }
 180
 181 void
 182 AudioMappingView::paint_column_labels (wxDC& dc, wxGraphicsContext* gc)
 183 {
 184         wxCoord label_width;
 185         wxCoord label_height;
 186         int N = 0;
 187         BOOST_FOREACH (string i, _output_channels) {
 188                 dc.GetTextExtent (std_to_wx(i), &label_width, &label_height);
 189                 dc.DrawText (std_to_wx(i), LEFT_WIDTH + GRID_SPACING * N + (GRID_SPACING - label_width) / 2, GRID_SPACING + (GRID_SPACING - label_height) / 2);
 190                 ++N;
 191         }
 192
 193         wxGraphicsPath lines = gc->CreatePath ();
 194         lines.MoveToPoint (LEFT_WIDTH, GRID_SPACING);
 195         lines.AddLineToPoint (LEFT_WIDTH + _output_channels.size() * GRID_SPACING, GRID_SPACING);
 196         lines.MoveToPoint (LEFT_WIDTH, GRID_SPACING * 2);
 197         lines.AddLineToPoint (LEFT_WIDTH + _output_channels.size() * GRID_SPACING, GRID_SPACING * 2);
 198         gc->StrokePath (lines);
 199 }
 200
 201 void
 202 AudioMappingView::paint_column_lines (wxGraphicsContext* gc)
 203 {
 204         wxGraphicsPath lines = gc->CreatePath ();
 205         for (size_t i = 0; i < _output_channels.size(); ++i) {
 206                 lines.MoveToPoint    (LEFT_WIDTH + GRID_SPACING * i, GRID_SPACING);
 207                 lines.AddLineToPoint (LEFT_WIDTH + GRID_SPACING * i, TOP_HEIGHT + _input_channels.size() * GRID_SPACING);
 208         }
 209         lines.MoveToPoint    (LEFT_WIDTH + GRID_SPACING * _output_channels.size(), GRID_SPACING);
 210         lines.AddLineToPoint (LEFT_WIDTH + GRID_SPACING * _output_channels.size(), TOP_HEIGHT + _input_channels.size() * GRID_SPACING);
 211         gc->StrokePath (lines);
 212 }
 213
 214 void
 215 AudioMappingView::paint_row_labels (wxDC& dc, wxGraphicsContext* gc)
 216 {
 217         wxCoord label_width;
 218         wxCoord label_height;
 219         wxGraphicsPath lines = gc->CreatePath ();
 220
 221         /* Row channel labels */
 222
 223         int N = 0;
 224         BOOST_FOREACH (string i, _input_channels) {
 225                 dc.GetTextExtent (std_to_wx(i), &label_width, &label_height);
 226                 dc.DrawText (std_to_wx(i), GRID_SPACING * 2 + (GRID_SPACING - label_width) / 2, TOP_HEIGHT + GRID_SPACING * N + (GRID_SPACING - label_height) / 2);
 227                 ++N;
 228         }
 229
 230         /* Vertical lines on the left */
 231
 232         for (int i = 1; i < 3; ++i) {
 233                 lines.MoveToPoint    (GRID_SPACING * i, TOP_HEIGHT);
 234                 lines.AddLineToPoint (GRID_SPACING * i, TOP_HEIGHT + _input_channels.size() * GRID_SPACING);
 235         }
 236
 237         /* Group labels and lines */
 238
 239         int y = TOP_HEIGHT;
 240         BOOST_FOREACH (Group i, _input_groups) {
 241                 int const height = (i.to - i.from + 1) * GRID_SPACING;
 242                 dc.GetTextExtent (std_to_wx(i.name), &label_width, &label_height);
 243                 if (label_width > height) {
 244                         label_width = height - 8;
 245                 }
 246
 247                 {
 248                         int yp = y;
 249                         if ((yp - 2 * GRID_SPACING) < dc.GetLogicalOrigin().y) {
 250                                 yp += dc.GetLogicalOrigin().y;
 251                         }
 252
 253                         wxCoord old_x, old_y, old_width, old_height;
 254                         dc.GetClippingBox (&old_x, &old_y, &old_width, &old_height);
 255                         dc.DestroyClippingRegion ();
 256                         dc.SetClippingRegion (GRID_SPACING, yp + 4, GRID_SPACING, height - 8);
 257
 258                         dc.DrawRotatedText (
 259                                 std_to_wx(i.name),
 260                                 GRID_SPACING + (GRID_SPACING - label_height) / 2,
 261                                 y + (height + label_width) / 2,
 262                                 90
 263                                 );
 264
 265                         dc.DestroyClippingRegion ();
 266                         dc.SetClippingRegion (old_x, old_y, old_width, old_height);
 267                 }
 268
 269                 lines.MoveToPoint    (GRID_SPACING,     y);
 270                 lines.AddLineToPoint (GRID_SPACING * 2, y);
 271                 y += height;
 272         }
 273
 274         lines.MoveToPoint    (GRID_SPACING,     y);
 275         lines.AddLineToPoint (GRID_SPACING * 2, y);
 276
 277         gc->StrokePath (lines);
 278 }
 279
 280 void
 281 AudioMappingView::paint_row_lines (wxGraphicsContext* gc)
 282 {
 283         wxGraphicsPath lines = gc->CreatePath ();
 284         for (size_t i = 0; i < _input_channels.size(); ++i) {
 285                 lines.MoveToPoint (GRID_SPACING * 2, TOP_HEIGHT + GRID_SPACING * i);
 286                 lines.AddLineToPoint (LEFT_WIDTH + _output_channels.size() * GRID_SPACING, TOP_HEIGHT + GRID_SPACING * i);
 287         }
 288         lines.MoveToPoint (GRID_SPACING * 2, TOP_HEIGHT + GRID_SPACING * _input_channels.size());
 289         lines.AddLineToPoint (LEFT_WIDTH + _output_channels.size() * GRID_SPACING, TOP_HEIGHT + GRID_SPACING * _input_channels.size());
 290         gc->StrokePath (lines);
 291 }
 292
 293 void
 294 AudioMappingView::paint_indicators (wxDC& dc)
 295 {
 296         /* _{input,output}_channels and _map may not always be in sync, be careful here */
 297         size_t const output = min(_output_channels.size(), size_t(_map.output_channels()));
 298         size_t const input = min(_input_channels.size(), size_t(_map.input_channels()));
 299
 300         for (size_t x = 0; x < output; ++x) {
 301                 for (size_t y = 0; y < input; ++y) {
 302                         dc.SetBrush (*wxWHITE_BRUSH);
 303                         dc.DrawRectangle (
 304                                 wxRect(
 305                                         LEFT_WIDTH + x * GRID_SPACING + (GRID_SPACING - INDICATOR_SIZE) / 2,
 306                                         TOP_HEIGHT + y * GRID_SPACING + (GRID_SPACING - INDICATOR_SIZE) / 2,
 307                                         INDICATOR_SIZE, INDICATOR_SIZE
 308                                         )
 309                                 );
 310
 311                         float const value_dB = 20 * log10 (_map.get(y, x));
 312                         int const range = 18;
 313                         int height = 0;
 314                         if (value_dB > -range) {
 315                                 height = INDICATOR_SIZE * (1 + value_dB / range);
 316                         }
 317
 318                         dc.SetBrush (*wxTheBrushList->FindOrCreateBrush(wxColour (0, 255, 0), wxBRUSHSTYLE_SOLID));
 319                         dc.DrawRectangle (
 320                                 wxRect(
 321                                         LEFT_WIDTH + x * GRID_SPACING + (GRID_SPACING - INDICATOR_SIZE) / 2,
 322                                         TOP_HEIGHT + y * GRID_SPACING + (GRID_SPACING - INDICATOR_SIZE) / 2 + INDICATOR_SIZE - height,
 323                                         INDICATOR_SIZE, height
 324                                         )
 325                                 );
 326                 }
 327         }
 328 }
 329
 330 static
 331 void clip (wxDC& dc, wxGraphicsContext* gc, int x, int y, int w, int h)
 332 {
 333         dc.SetClippingRegion (x, y, w, h);
 334         gc->Clip (x, y, w, h);
 335 }
 336
 337 static
 338 void translate (wxDC& dc, wxGraphicsContext* gc, int x, int y)
 339 {
 340         gc->PushState ();
 341         gc->Translate (-x, -y);
 342         dc.SetLogicalOrigin (x, y);
 343 }
 344
 345 static
 346 void restore (wxDC& dc, wxGraphicsContext* gc)
 347 {
 348         dc.SetLogicalOrigin (0, 0);
 349         gc->PopState ();
 350         dc.DestroyClippingRegion ();
 351         gc->ResetClip ();
 352 }
 353
 354 void
 355 AudioMappingView::paint ()
 356 {
 357         wxPaintDC dc (_body);
 358
 359         wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
 360         if (!gc) {
 361                 return;
 362         }
 363
 364         int const hs = _horizontal_scroll->GetThumbPosition ();
 365         int const vs = _vertical_scroll->GetThumbPosition ();
 366
 367         paint_static (dc, gc);
 368
 369         clip (dc, gc, LEFT_WIDTH, 0, GRID_SPACING * _output_channels.size(), GRID_SPACING * (2 + _input_channels.size()));
 370         translate (dc, gc, hs, 0);
 371         paint_column_labels (dc, gc);
 372         restore (dc, gc);
 373
 374         clip (dc, gc, 0, TOP_HEIGHT, GRID_SPACING * (3 + _output_channels.size()), GRID_SPACING * _input_channels.size() + 1);
 375         translate (dc, gc, 0, vs);
 376         paint_row_labels (dc, gc);
 377         restore (dc, gc);
 378
 379         clip (dc, gc, GRID_SPACING * 2, TOP_HEIGHT, GRID_SPACING * (1 + _output_channels.size()), GRID_SPACING * _input_channels.size() + 1);
 380         translate (dc, gc, hs, vs);
 381         paint_row_lines (gc);
 382         restore (dc, gc);
 383
 384         clip (dc, gc, LEFT_WIDTH, GRID_SPACING, GRID_SPACING * (1 + _output_channels.size()), GRID_SPACING * (1 + _input_channels.size()));
 385         translate (dc, gc, hs, vs);
 386         paint_column_lines (gc);
 387         restore (dc, gc);
 388
 389         clip (dc, gc, LEFT_WIDTH, TOP_HEIGHT, GRID_SPACING * _output_channels.size(), GRID_SPACING * _input_channels.size());
 390         translate (dc, gc, hs, vs);
 391         paint_indicators (dc);
 392         restore (dc, gc);
 393
 394         delete gc;
 395 }
 396
 397 optional<pair<int, int> >
 398 AudioMappingView::mouse_event_to_channels (wxMouseEvent& ev) const
 399 {
 400         int const x = ev.GetX() + _horizontal_scroll->GetThumbPosition();
 401         int const y = ev.GetY() + _vertical_scroll->GetThumbPosition();
 402
 403         if (x <= LEFT_WIDTH || y < TOP_HEIGHT) {
 404                 return optional<pair<int, int> >();
 405         }
 406
 407         int const input = (y - TOP_HEIGHT) / GRID_SPACING;
 408         int const output = (x - LEFT_WIDTH) / GRID_SPACING;
 409
 410         if (input >= int(_input_channels.size()) || output >= int(_output_channels.size())) {
 411                 return optional<pair<int, int> >();
 412         }
 413
 414         return make_pair (input, output);
 415 }
 416
 417 optional<string>
 418 AudioMappingView::mouse_event_to_input_group_name (wxMouseEvent& ev) const
 419 {
 420         int const x = ev.GetX() + _horizontal_scroll->GetThumbPosition();
 421         if (x < GRID_SPACING || x > (2 * GRID_SPACING)) {
 422                 return optional<string>();
 423         }
 424
 425         int y = (ev.GetY() + _vertical_scroll->GetThumbPosition() - (GRID_SPACING * 2)) / GRID_SPACING;
 426         BOOST_FOREACH (Group i, _input_groups) {
 427                 if (i.from <= y && y <= i.to) {
 428                         return i.name;
 429                 }
 430         }
 431
 432         return optional<string>();
 433 }
 434
 435 void
 436 AudioMappingView::left_down (wxMouseEvent& ev)
 437 {
 438         optional<pair<int, int> > channels = mouse_event_to_channels (ev);
 439         if (!channels) {
 440                 return;
 441         }
 442
 443         if (_map.get(channels->first, channels->second) > 0) {
 444                 _map.set (channels->first, channels->second, 0);
 445         } else {
 446                 _map.set (channels->first, channels->second, 1);
 447         }
 448
 449         map_values_changed ();
 450 }
 451
 452 void
 453 AudioMappingView::right_down (wxMouseEvent& ev)
 454 {
 455         optional<pair<int, int> > channels = mouse_event_to_channels (ev);
 456         if (!channels) {
 457                 return;
 458         }
 459
 460         _menu_input = channels->first;
 461         _menu_output = channels->second;
 462         PopupMenu (_menu, ev.GetPosition());
 463 }
 464
 465 void
 466 AudioMappingView::mouse_wheel (wxMouseEvent& ev)
 467 {
 468         if (ev.ShiftDown()) {
 469                 _horizontal_scroll->SetThumbPosition (
 470                         _horizontal_scroll->GetThumbPosition() + (ev.GetWheelRotation() > 0 ? -GRID_SPACING : GRID_SPACING)
 471                         );
 472
 473         } else {
 474                 _vertical_scroll->SetThumbPosition (
 475                         _vertical_scroll->GetThumbPosition() + (ev.GetWheelRotation() > 0 ? -GRID_SPACING : GRID_SPACING)
 476                         );
 477         }
 478         Refresh ();
 479 }
 480
 481 /** Called when any gain value has changed */
 482 void
 483 AudioMappingView::map_values_changed ()
 484 {
 485         Changed (_map);
 486         _last_tooltip_channels = optional<pair<int, int> >();
 487         Refresh ();
 488 }
 489
 490 void
 491 AudioMappingView::off ()
 492 {
 493         _map.set (_menu_input, _menu_output, 0);
 494         map_values_changed ();
 495 }
 496
 497 void
 498 AudioMappingView::full ()
 499 {
 500         _map.set (_menu_input, _menu_output, 1);
 501         map_values_changed ();
 502 }
 503
 504 void
 505 AudioMappingView::minus6dB ()
 506 {
 507         _map.set (_menu_input, _menu_output, pow (10, -6.0 / 20));
 508         map_values_changed ();
 509 }
 510
 511 void
 512 AudioMappingView::edit ()
 513 {
 514         AudioGainDialog* dialog = new AudioGainDialog (this, _menu_input, _menu_output, _map.get(_menu_input, _menu_output));
 515         if (dialog->ShowModal() == wxID_OK) {
 516                 _map.set (_menu_input, _menu_output, dialog->value ());
 517                 map_values_changed ();
 518         }
 519
 520         dialog->Destroy ();
 521 }
 522
 523 void
 524 AudioMappingView::set (AudioMapping map)
 525 {
 526         _map = map;
 527         Refresh ();
 528 }
 529
 530 void
 531 AudioMappingView::set_input_channels (vector<string> const & names)
 532 {
 533         _input_channels = names;
 534         setup ();
 535         Refresh ();
 536 }
 537
 538 void
 539 AudioMappingView::set_output_channels (vector<string> const & names)
 540 {
 541         _output_channels = names;
 542         setup ();
 543         Refresh ();
 544 }
 545
 546 wxString
 547 AudioMappingView::safe_input_channel_name (int n) const
 548 {
 549         if (n >= int(_input_channels.size())) {
 550                 return wxString::Format ("%d", n + 1);
 551         }
 552
 553         optional<wxString> group;
 554         BOOST_FOREACH (Group i, _input_groups) {
 555                 if (i.from <= n && n <= i.to) {
 556                         group = std_to_wx (i.name);
 557                 }
 558         }
 559
 560         if (group) {
 561                 return wxString::Format ("%s/%s", group->data(), std_to_wx(_input_channels[n]).data());
 562         }
 563
 564         return std_to_wx(_input_channels[n]);
 565 }
 566
 567 wxString
 568 AudioMappingView::safe_output_channel_name (int n) const
 569 {
 570         if (n >= int(_output_channels.size())) {
 571                 return wxString::Format ("%d", n + 1);
 572         }
 573
 574         return std_to_wx(_output_channels[n]);
 575 }
 576
 577 void
 578 AudioMappingView::motion (wxMouseEvent& ev)
 579 {
 580         optional<pair<int, int> > channels = mouse_event_to_channels (ev);
 581         if (channels) {
 582                 if (channels != _last_tooltip_channels) {
 583                         wxString s;
 584                         float const gain = _map.get(channels->first, channels->second);
 585                         if (gain == 0) {
 586                                 s = wxString::Format (
 587                                         _("No audio will be passed from content channel '%s' to DCP channel '%s'."),
 588                                         safe_input_channel_name(channels->first),
 589                                         safe_output_channel_name(channels->second)
 590                                         );
 591                         } else if (gain == 1) {
 592                                 s = wxString::Format (
 593                                         _("Audio will be passed from content channel %s to DCP channel %s unaltered."),
 594                                         safe_input_channel_name(channels->first),
 595                                         safe_output_channel_name(channels->second)
 596                                         );
 597                         } else {
 598                                 float const dB = 20 * log10 (gain);
 599                                 s = wxString::Format (
 600                                         _("Audio will be passed from content channel %s to DCP channel %s with gain %.1fdB."),
 601                                         safe_input_channel_name(channels->first),
 602                                         safe_output_channel_name(channels->second),
 603                                         dB
 604                                         );
 605                         }
 606
 607                         SetToolTip (s + " " + _("Right click to change gain."));
 608                 }
 609         } else {
 610                 optional<string> group = mouse_event_to_input_group_name (ev);
 611                 if (group) {
 612                         SetToolTip (std_to_wx(*group));
 613                 } else {
 614                         SetToolTip ("");
 615                 }
 616         }
 617
 618         _last_tooltip_channels = channels;
 619         ev.Skip ();
 620 }
 621
 622 void
 623 AudioMappingView::set_input_groups (vector<Group> const & groups)
 624 {
 625         _input_groups = groups;
 626 }