src/wx/audio_mapping_view.cc

   1 /*
   2     Copyright (C) 2013-2020 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 "lib/warnings.h"
  31 #include <dcp/locale_convert.h>
  32 #include <dcp/types.h>
  33 DCPOMATIC_DISABLE_WARNINGS
  34 #include <wx/wx.h>
  35 #include <wx/renderer.h>
  36 #include <wx/grid.h>
  37 #include <wx/graphics.h>
  38 DCPOMATIC_ENABLE_WARNINGS
  39 #include <boost/foreach.hpp>
  40 #include <iostream>
  41
  42 using std::cout;
  43 using std::list;
  44 using std::string;
  45 using std::min;
  46 using std::max;
  47 using std::vector;
  48 using std::pair;
  49 using std::make_pair;
  50 using std::shared_ptr;
  51 using boost::optional;
  52 #if BOOST_VERSION >= 106100
  53 using namespace boost::placeholders;
  54 #endif
  55 using dcp::locale_convert;
  56
  57 #define INDICATOR_SIZE 20
  58 #define GRID_SPACING 32
  59 #define LEFT_WIDTH (GRID_SPACING * 3)
  60 #define TOP_HEIGHT (GRID_SPACING * 2)
  61
  62 enum {
  63         ID_off = 1,
  64         ID_minus6dB = 2,
  65         ID_0dB = 3,
  66         ID_plus3dB = 4,
  67         ID_edit = 5
  68 };
  69
  70 AudioMappingView::AudioMappingView (wxWindow* parent, wxString left_label, wxString from, wxString top_label, wxString to)
  71         : wxPanel (parent, wxID_ANY)
  72         , _menu_input (0)
  73         , _menu_output (1)
  74         , _left_label (left_label)
  75         , _from (from)
  76         , _top_label (top_label)
  77         , _to (to)
  78 {
  79         _menu = new wxMenu;
  80         _menu->Append (ID_off, _("Off"));
  81         _menu->Append (ID_minus6dB, _("-6dB"));
  82         _menu->Append (ID_0dB, _("0dB (unchanged)"));
  83         _menu->Append (ID_plus3dB, _("+3dB"));
  84         _menu->Append (ID_edit, _("Edit..."));
  85
  86         _body = new wxPanel (this, wxID_ANY);
  87         _vertical_scroll = new wxScrollBar (this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxSB_VERTICAL);
  88         _horizontal_scroll = new wxScrollBar (this, wxID_ANY);
  89
  90 #ifndef __WXOSX__
  91         SetDoubleBuffered (true);
  92 #endif
  93
  94         Bind (wxEVT_SIZE, boost::bind(&AudioMappingView::size, this, _1));
  95         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::set_gain_from_menu, this, 0), ID_off);
  96         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::set_gain_from_menu, this, db_to_linear(-6)), ID_minus6dB);
  97         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::set_gain_from_menu, this, 1), ID_0dB);
  98         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::set_gain_from_menu, this, db_to_linear(3)), ID_plus3dB);
  99         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::edit, this), ID_edit);
 100         Bind (wxEVT_MOUSEWHEEL, boost::bind(&AudioMappingView::mouse_wheel, this, _1));
 101         _body->Bind (wxEVT_PAINT, boost::bind(&AudioMappingView::paint, this));
 102         _body->Bind (wxEVT_LEFT_DOWN, boost::bind(&AudioMappingView::left_down, this, _1));
 103         _body->Bind (wxEVT_RIGHT_DOWN, boost::bind(&AudioMappingView::right_down, this, _1));
 104         _body->Bind (wxEVT_MOTION, boost::bind(&AudioMappingView::motion, this, _1));
 105         _vertical_scroll->Bind (wxEVT_SCROLL_TOP, boost::bind(&AudioMappingView::scroll, this));
 106         _vertical_scroll->Bind (wxEVT_SCROLL_BOTTOM, boost::bind(&AudioMappingView::scroll, this));
 107         _vertical_scroll->Bind (wxEVT_SCROLL_LINEUP, boost::bind(&AudioMappingView::scroll, this));
 108         _vertical_scroll->Bind (wxEVT_SCROLL_LINEDOWN, boost::bind(&AudioMappingView::scroll, this));
 109         _vertical_scroll->Bind (wxEVT_SCROLL_PAGEUP, boost::bind(&AudioMappingView::scroll, this));
 110         _vertical_scroll->Bind (wxEVT_SCROLL_PAGEDOWN, boost::bind(&AudioMappingView::scroll, this));
 111         _vertical_scroll->Bind (wxEVT_SCROLL_THUMBTRACK, boost::bind(&AudioMappingView::scroll, this));
 112         _vertical_scroll->Bind (wxEVT_SCROLL_THUMBRELEASE, boost::bind(&AudioMappingView::scroll, this));
 113         _horizontal_scroll->Bind (wxEVT_SCROLL_TOP, boost::bind(&AudioMappingView::scroll, this));
 114         _horizontal_scroll->Bind (wxEVT_SCROLL_BOTTOM, boost::bind(&AudioMappingView::scroll, this));
 115         _horizontal_scroll->Bind (wxEVT_SCROLL_LINEUP, boost::bind(&AudioMappingView::scroll, this));
 116         _horizontal_scroll->Bind (wxEVT_SCROLL_LINEDOWN, boost::bind(&AudioMappingView::scroll, this));
 117         _horizontal_scroll->Bind (wxEVT_SCROLL_PAGEUP, boost::bind(&AudioMappingView::scroll, this));
 118         _horizontal_scroll->Bind (wxEVT_SCROLL_PAGEDOWN, boost::bind(&AudioMappingView::scroll, this));
 119         _horizontal_scroll->Bind (wxEVT_SCROLL_THUMBTRACK, boost::bind(&AudioMappingView::scroll, this));
 120         _horizontal_scroll->Bind (wxEVT_SCROLL_THUMBRELEASE, boost::bind(&AudioMappingView::scroll, this));
 121 }
 122
 123 void
 124 AudioMappingView::size (wxSizeEvent& ev)
 125 {
 126         setup ();
 127         ev.Skip ();
 128 }
 129
 130 void
 131 AudioMappingView::setup ()
 132 {
 133         wxSize const s = GetSize();
 134         int const w = _vertical_scroll->GetSize().GetWidth();
 135         int const h = _horizontal_scroll->GetSize().GetHeight();
 136
 137         _vertical_scroll->SetPosition (wxPoint(s.GetWidth() - w, 0));
 138         _vertical_scroll->SetSize (wxSize(w, max(0, s.GetHeight() - h)));
 139
 140         _body->SetSize (wxSize(max(0, s.GetWidth() - w), max(0, s.GetHeight() - h)));
 141
 142         _horizontal_scroll->SetPosition (wxPoint(0, s.GetHeight() - h));
 143         _horizontal_scroll->SetSize (wxSize(max(0, s.GetWidth() - w), h));
 144
 145         _vertical_scroll->SetScrollbar (
 146                 _vertical_scroll->GetThumbPosition(),
 147                 s.GetHeight() - h - 8,
 148                 GRID_SPACING * (2 + _input_channels.size()),
 149                 GRID_SPACING,
 150                 true
 151                 );
 152
 153         _horizontal_scroll->SetScrollbar (
 154                 _horizontal_scroll->GetThumbPosition(),
 155                 s.GetWidth() - w - 8,
 156                 GRID_SPACING * (3 + _output_channels.size()),
 157                 GRID_SPACING,
 158                 true);
 159 }
 160
 161 void
 162 AudioMappingView::scroll ()
 163 {
 164         Refresh ();
 165 }
 166
 167 void
 168 AudioMappingView::paint_static (wxDC& dc)
 169 {
 170         dc.SetFont (wxSWISS_FONT->Bold());
 171         wxCoord label_width;
 172         wxCoord label_height;
 173
 174         dc.GetTextExtent (_top_label, &label_width, &label_height);
 175         dc.DrawText (_top_label, LEFT_WIDTH + (_output_channels.size() * GRID_SPACING - label_width) / 2, (GRID_SPACING - label_height) / 2);
 176
 177         dc.GetTextExtent (_left_label, &label_width, &label_height);
 178         dc.DrawRotatedText (
 179                 _left_label,
 180                 (GRID_SPACING - label_height) / 2,
 181                 TOP_HEIGHT + (_input_channels.size() * GRID_SPACING + label_width) / 2,
 182                 90
 183                 );
 184
 185         dc.SetFont (*wxSWISS_FONT);
 186 }
 187
 188 void
 189 AudioMappingView::paint_column_labels (wxDC& dc)
 190 {
 191         wxCoord label_width;
 192         wxCoord label_height;
 193         int N = 0;
 194         BOOST_FOREACH (NamedChannel const& i, _output_channels) {
 195                 dc.GetTextExtent (std_to_wx(i.name), &label_width, &label_height);
 196                 dc.DrawText (std_to_wx(i.name), LEFT_WIDTH + GRID_SPACING * N + (GRID_SPACING - label_width) / 2, GRID_SPACING + (GRID_SPACING - label_height) / 2);
 197                 ++N;
 198         }
 199
 200         dc.DrawLine(wxPoint(LEFT_WIDTH, GRID_SPACING), wxPoint(LEFT_WIDTH + _output_channels.size() * GRID_SPACING, GRID_SPACING));
 201         dc.DrawLine(wxPoint(LEFT_WIDTH, GRID_SPACING * 2), wxPoint(LEFT_WIDTH + _output_channels.size() * GRID_SPACING, GRID_SPACING * 2));
 202 }
 203
 204 void
 205 AudioMappingView::paint_column_lines (wxDC& dc)
 206 {
 207         for (size_t i = 0; i < _output_channels.size(); ++i) {
 208                 dc.DrawLine (
 209                         wxPoint(LEFT_WIDTH + GRID_SPACING * i, GRID_SPACING),
 210                         wxPoint(LEFT_WIDTH + GRID_SPACING * i, TOP_HEIGHT + _input_channels.size() * GRID_SPACING)
 211                         );
 212         }
 213
 214         dc.DrawLine (
 215                 wxPoint(LEFT_WIDTH + GRID_SPACING * _output_channels.size(), GRID_SPACING),
 216                 wxPoint(LEFT_WIDTH + GRID_SPACING * _output_channels.size(), TOP_HEIGHT + _input_channels.size() * GRID_SPACING)
 217                 );
 218 }
 219
 220 void
 221 AudioMappingView::paint_row_labels (wxDC& dc)
 222 {
 223         wxCoord label_width;
 224         wxCoord label_height;
 225
 226         /* Row channel labels */
 227
 228         int N = 0;
 229         BOOST_FOREACH (NamedChannel const& i, _input_channels) {
 230                 dc.GetTextExtent (std_to_wx(i.name), &label_width, &label_height);
 231                 dc.DrawText (std_to_wx(i.name), GRID_SPACING * 2 + (GRID_SPACING - label_width) / 2, TOP_HEIGHT + GRID_SPACING * N + (GRID_SPACING - label_height) / 2);
 232                 ++N;
 233         }
 234
 235         /* Vertical lines on the left */
 236
 237         for (int i = 1; i < 3; ++i) {
 238                 dc.DrawLine (
 239                         wxPoint(GRID_SPACING * i, TOP_HEIGHT),
 240                         wxPoint(GRID_SPACING * i, TOP_HEIGHT + _input_channels.size() * GRID_SPACING)
 241                         );
 242         }
 243
 244         /* Group labels and lines */
 245
 246         int y = TOP_HEIGHT;
 247         BOOST_FOREACH (Group i, _input_groups) {
 248                 int const height = (i.to - i.from + 1) * GRID_SPACING;
 249                 dc.GetTextExtent (std_to_wx(i.name), &label_width, &label_height);
 250                 if (label_width > height) {
 251                         label_width = height - 8;
 252                 }
 253
 254                 {
 255                         wxDCClipper clip (dc, wxRect(GRID_SPACING, y, GRID_SPACING, height));
 256                         int yp = y;
 257                         if ((yp - 2 * GRID_SPACING) < dc.GetLogicalOrigin().y) {
 258                                 yp += dc.GetLogicalOrigin().y;
 259                         }
 260
 261                         dc.DrawRotatedText (
 262                                 std_to_wx(i.name),
 263                                 GRID_SPACING + (GRID_SPACING - label_height) / 2,
 264                                 y + (height + label_width) / 2,
 265                                 90
 266                                 );
 267                 }
 268
 269                 dc.DrawLine (wxPoint(GRID_SPACING, y), wxPoint(GRID_SPACING * 2, y));
 270                 y += height;
 271         }
 272
 273         dc.DrawLine (wxPoint(GRID_SPACING, y), wxPoint(GRID_SPACING * 2, y));
 274 }
 275
 276 void
 277 AudioMappingView::paint_row_lines (wxDC& dc)
 278 {
 279         for (size_t i = 0; i < _input_channels.size(); ++i) {
 280                 dc.DrawLine (
 281                         wxPoint(GRID_SPACING * 2, TOP_HEIGHT + GRID_SPACING * i),
 282                         wxPoint(LEFT_WIDTH + _output_channels.size() * GRID_SPACING, TOP_HEIGHT + GRID_SPACING * i)
 283                         );
 284         }
 285         dc.DrawLine (
 286                 wxPoint(GRID_SPACING * 2, TOP_HEIGHT + GRID_SPACING * _input_channels.size()),
 287                 wxPoint(LEFT_WIDTH + _output_channels.size() * GRID_SPACING, TOP_HEIGHT + GRID_SPACING * _input_channels.size())
 288                 );
 289 }
 290
 291 void
 292 AudioMappingView::paint_indicators (wxDC& dc)
 293 {
 294         /* _{input,output}_channels and _map may not always be in sync, be careful here */
 295         size_t const output = min(_output_channels.size(), size_t(_map.output_channels()));
 296         size_t const input = min(_input_channels.size(), size_t(_map.input_channels()));
 297
 298         for (size_t x = 0; x < output; ++x) {
 299                 for (size_t y = 0; y < input; ++y) {
 300                         dc.SetBrush (*wxWHITE_BRUSH);
 301                         dc.DrawRectangle (
 302                                 wxRect(
 303                                         LEFT_WIDTH + x * GRID_SPACING + (GRID_SPACING - INDICATOR_SIZE) / 2,
 304                                         TOP_HEIGHT + y * GRID_SPACING + (GRID_SPACING - INDICATOR_SIZE) / 2,
 305                                         INDICATOR_SIZE, INDICATOR_SIZE
 306                                         )
 307                                 );
 308
 309                         float const value_dB = linear_to_db(_map.get(_input_channels[y].index, _output_channels[x].index));
 310                         wxColour const colour = value_dB <= 0 ? wxColour(0, 255, 0) : wxColour(255, 150, 0);
 311                         int const range = 18;
 312                         int height = 0;
 313                         if (value_dB > -range) {
 314                                 height = min(INDICATOR_SIZE, static_cast<int>(INDICATOR_SIZE * (1 + value_dB / range)));
 315                         }
 316
 317                         dc.SetBrush (*wxTheBrushList->FindOrCreateBrush(colour, wxBRUSHSTYLE_SOLID));
 318                         dc.DrawRectangle (
 319                                 wxRect(
 320                                         LEFT_WIDTH + x * GRID_SPACING + (GRID_SPACING - INDICATOR_SIZE) / 2,
 321                                         TOP_HEIGHT + y * GRID_SPACING + (GRID_SPACING - INDICATOR_SIZE) / 2 + INDICATOR_SIZE - height,
 322                                         INDICATOR_SIZE, height
 323                                         )
 324                                 );
 325                 }
 326         }
 327 }
 328
 329 static
 330 void clip (wxDC& dc, int x, int y, int w, int h)
 331 {
 332         dc.SetClippingRegion (x, y, w, h);
 333 }
 334
 335 static
 336 void translate (wxDC& dc, int x, int y)
 337 {
 338         dc.SetLogicalOrigin (x, y);
 339 }
 340
 341 static
 342 void restore (wxDC& dc)
 343 {
 344         dc.SetLogicalOrigin (0, 0);
 345         dc.DestroyClippingRegion ();
 346 }
 347
 348 void
 349 AudioMappingView::paint ()
 350 {
 351         wxPaintDC dc (_body);
 352
 353         int const hs = _horizontal_scroll->GetThumbPosition ();
 354         int const vs = _vertical_scroll->GetThumbPosition ();
 355
 356         paint_static (dc);
 357
 358         clip (
 359                 dc,
 360                 LEFT_WIDTH,
 361                 0,
 362                 GRID_SPACING * _output_channels.size(),
 363                 GRID_SPACING * (2 + _input_channels.size())
 364              );
 365         translate (dc, hs, 0);
 366         paint_column_labels (dc);
 367         restore (dc);
 368
 369         clip (
 370                 dc,
 371                 0,
 372                 TOP_HEIGHT,
 373                 GRID_SPACING * 3,
 374                 min(int(GRID_SPACING * _input_channels.size()), GetSize().GetHeight() - TOP_HEIGHT)
 375              );
 376         translate (dc, 0, vs);
 377         paint_row_labels (dc);
 378         restore (dc);
 379
 380         clip (
 381                 dc,
 382                 GRID_SPACING * 2,
 383                 TOP_HEIGHT,
 384                 GRID_SPACING * (1 + _output_channels.size()),
 385                 min(int(GRID_SPACING * (2 + _input_channels.size())), GetSize().GetHeight() - TOP_HEIGHT)
 386              );
 387         translate (dc, hs, vs);
 388         paint_row_lines (dc);
 389         restore (dc);
 390
 391         clip (
 392                 dc,
 393                 LEFT_WIDTH,
 394                 GRID_SPACING,
 395                 GRID_SPACING * (1 + _output_channels.size()),
 396                 min(int(GRID_SPACING * (1 + _input_channels.size())), GetSize().GetHeight() - GRID_SPACING)
 397              );
 398         translate (dc, hs, vs);
 399         paint_column_lines (dc);
 400         restore (dc);
 401
 402         clip (
 403                 dc,
 404                 LEFT_WIDTH,
 405                 TOP_HEIGHT,
 406                 GRID_SPACING * _output_channels.size(),
 407                 min(int(GRID_SPACING * _input_channels.size()), GetSize().GetHeight() - TOP_HEIGHT)
 408              );
 409         translate (dc, hs, vs);
 410         paint_indicators (dc);
 411         restore (dc);
 412 }
 413
 414 optional<pair<NamedChannel, NamedChannel> >
 415 AudioMappingView::mouse_event_to_channels (wxMouseEvent& ev) const
 416 {
 417         int const x = ev.GetX() + _horizontal_scroll->GetThumbPosition();
 418         int const y = ev.GetY() + _vertical_scroll->GetThumbPosition();
 419
 420         if (x <= LEFT_WIDTH || y < TOP_HEIGHT) {
 421                 return optional<pair<NamedChannel, NamedChannel> >();
 422         }
 423
 424         int const input = (y - TOP_HEIGHT) / GRID_SPACING;
 425         int const output = (x - LEFT_WIDTH) / GRID_SPACING;
 426
 427         if (input >= int(_input_channels.size()) || output >= int(_output_channels.size())) {
 428                 return optional<pair<NamedChannel, NamedChannel> >();
 429         }
 430
 431         return make_pair (_input_channels[input], _output_channels[output]);
 432 }
 433
 434 optional<string>
 435 AudioMappingView::mouse_event_to_input_group_name (wxMouseEvent& ev) const
 436 {
 437         int const x = ev.GetX() + _horizontal_scroll->GetThumbPosition();
 438         if (x < GRID_SPACING || x > (2 * GRID_SPACING)) {
 439                 return optional<string>();
 440         }
 441
 442         int y = (ev.GetY() + _vertical_scroll->GetThumbPosition() - (GRID_SPACING * 2)) / GRID_SPACING;
 443         BOOST_FOREACH (Group i, _input_groups) {
 444                 if (i.from <= y && y <= i.to) {
 445                         return i.name;
 446                 }
 447         }
 448
 449         return optional<string>();
 450 }
 451
 452 void
 453 AudioMappingView::left_down (wxMouseEvent& ev)
 454 {
 455         optional<pair<NamedChannel, NamedChannel> > channels = mouse_event_to_channels (ev);
 456         if (!channels) {
 457                 return;
 458         }
 459
 460         if (_map.get(channels->first.index, channels->second.index) > 0) {
 461                 _map.set (channels->first.index, channels->second.index, 0);
 462         } else {
 463                 _map.set (channels->first.index, channels->second.index, 1);
 464         }
 465
 466         map_values_changed ();
 467 }
 468
 469 void
 470 AudioMappingView::right_down (wxMouseEvent& ev)
 471 {
 472         optional<pair<NamedChannel, NamedChannel> > channels = mouse_event_to_channels (ev);
 473         if (!channels) {
 474                 return;
 475         }
 476
 477         _menu_input = channels->first.index;
 478         _menu_output = channels->second.index;
 479         PopupMenu (_menu, ev.GetPosition());
 480 }
 481
 482 void
 483 AudioMappingView::mouse_wheel (wxMouseEvent& ev)
 484 {
 485         if (ev.ShiftDown()) {
 486                 _horizontal_scroll->SetThumbPosition (
 487                         _horizontal_scroll->GetThumbPosition() + (ev.GetWheelRotation() > 0 ? -GRID_SPACING : GRID_SPACING)
 488                         );
 489
 490         } else {
 491                 _vertical_scroll->SetThumbPosition (
 492                         _vertical_scroll->GetThumbPosition() + (ev.GetWheelRotation() > 0 ? -GRID_SPACING : GRID_SPACING)
 493                         );
 494         }
 495         Refresh ();
 496 }
 497
 498 /** Called when any gain value has changed */
 499 void
 500 AudioMappingView::map_values_changed ()
 501 {
 502         Changed (_map);
 503         _last_tooltip_channels = optional<pair<NamedChannel, NamedChannel> >();
 504         Refresh ();
 505 }
 506
 507 void
 508 AudioMappingView::set_gain_from_menu (double linear)
 509 {
 510         _map.set (_menu_input, _menu_output, linear);
 511         map_values_changed ();
 512 }
 513
 514 void
 515 AudioMappingView::edit ()
 516 {
 517         AudioGainDialog* dialog = new AudioGainDialog (this, _menu_input, _menu_output, _map.get(_menu_input, _menu_output));
 518         if (dialog->ShowModal() == wxID_OK) {
 519                 _map.set (_menu_input, _menu_output, dialog->value ());
 520                 map_values_changed ();
 521         }
 522
 523         dialog->Destroy ();
 524 }
 525
 526 void
 527 AudioMappingView::set (AudioMapping map)
 528 {
 529         _map = map;
 530         Refresh ();
 531 }
 532
 533 void
 534 AudioMappingView::set_input_channels (vector<NamedChannel> const& channels)
 535 {
 536         _input_channels = channels;
 537         setup ();
 538         Refresh ();
 539 }
 540
 541 void
 542 AudioMappingView::set_output_channels (vector<NamedChannel> const & channels)
 543 {
 544         _output_channels = channels;
 545         setup ();
 546         Refresh ();
 547 }
 548
 549
 550 wxString
 551 AudioMappingView::input_channel_name_with_group (NamedChannel const& n) const
 552 {
 553         optional<wxString> group;
 554         BOOST_FOREACH (Group i, _input_groups) {
 555                 if (i.from <= n.index && n.index <= i.to) {
 556                         group = std_to_wx (i.name);
 557                 }
 558         }
 559
 560         if (group && !group->IsEmpty()) {
 561                 return wxString::Format ("%s/%s", group->data(), std_to_wx(n.name).data());
 562         }
 563
 564         return std_to_wx(n.name);
 565 }
 566
 567
 568 void
 569 AudioMappingView::motion (wxMouseEvent& ev)
 570 {
 571         optional<pair<NamedChannel, NamedChannel> > channels = mouse_event_to_channels (ev);
 572         if (channels) {
 573                 if (channels != _last_tooltip_channels) {
 574                         wxString s;
 575                         float const gain = _map.get(channels->first.index, channels->second.index);
 576                         if (gain == 0) {
 577                                 s = wxString::Format (
 578                                         _("No audio will be passed from %s channel '%s' to %s channel '%s'."),
 579                                         _from,
 580                                         input_channel_name_with_group(channels->first),
 581                                         _to,
 582                                         std_to_wx(channels->second.name)
 583                                         );
 584                         } else if (gain == 1) {
 585                                 s = wxString::Format (
 586                                         _("Audio will be passed from %s channel %s to %s channel %s unaltered."),
 587                                         _from,
 588                                         input_channel_name_with_group(channels->first),
 589                                         _to,
 590                                         std_to_wx(channels->second.name)
 591                                         );
 592                         } else {
 593                                 float const dB = linear_to_db(gain);
 594                                 s = wxString::Format (
 595                                         _("Audio will be passed from %s channel %s to %s channel %s with gain %.1fdB."),
 596                                         _from,
 597                                         input_channel_name_with_group(channels->first),
 598                                         _to,
 599                                         std_to_wx(channels->second.name),
 600                                         dB
 601                                         );
 602                         }
 603
 604                         SetToolTip (s + " " + _("Right click to change gain."));
 605                 }
 606         } else {
 607                 optional<string> group = mouse_event_to_input_group_name (ev);
 608                 if (group) {
 609                         SetToolTip (std_to_wx(*group));
 610                 } else {
 611                         SetToolTip ("");
 612                 }
 613         }
 614
 615         _last_tooltip_channels = channels;
 616         ev.Skip ();
 617 }
 618
 619 void
 620 AudioMappingView::set_input_groups (vector<Group> const & groups)
 621 {
 622         _input_groups = groups;
 623 }