src/wx/audio_mapping_view.cc

   1 /*
   2     Copyright (C) 2013-2021 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 <iostream>
  40
  41 using std::cout;
  42 using std::list;
  43 using std::string;
  44 using std::min;
  45 using std::max;
  46 using std::vector;
  47 using std::pair;
  48 using std::make_pair;
  49 using std::shared_ptr;
  50 using boost::optional;
  51 #if BOOST_VERSION >= 106100
  52 using namespace boost::placeholders;
  53 #endif
  54 using dcp::locale_convert;
  55
  56 static constexpr auto INDICATOR_SIZE = 20;
  57 static constexpr auto ROW_HEIGHT = 32;
  58 static constexpr auto MINIMUM_COLUMN_WIDTH = 32;
  59 static constexpr auto LEFT_WIDTH = MINIMUM_COLUMN_WIDTH * 3;
  60 static constexpr auto TOP_HEIGHT = ROW_HEIGHT * 2;
  61 static constexpr auto COLUMN_PADDING = 16;
  62 static constexpr auto HORIZONTAL_PAGE_SIZE = 32;
  63
  64 enum {
  65         ID_off = 1,
  66         ID_minus6dB = 2,
  67         ID_0dB = 3,
  68         ID_plus3dB = 4,
  69         ID_edit = 5
  70 };
  71
  72 AudioMappingView::AudioMappingView (wxWindow* parent, wxString left_label, wxString from, wxString top_label, wxString to)
  73         : wxPanel (parent, wxID_ANY)
  74         , _menu_input (0)
  75         , _menu_output (1)
  76         , _left_label (left_label)
  77         , _from (from)
  78         , _top_label (top_label)
  79         , _to (to)
  80 {
  81         _menu = new wxMenu;
  82         _menu->Append (ID_off, _("Off"));
  83         _menu->Append (ID_minus6dB, _("-6dB"));
  84         _menu->Append (ID_0dB, _("0dB (unchanged)"));
  85         _menu->Append (ID_plus3dB, _("+3dB"));
  86         _menu->Append (ID_edit, _("Edit..."));
  87
  88         _body = new wxPanel (this, wxID_ANY);
  89         _vertical_scroll = new wxScrollBar (this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxSB_VERTICAL);
  90         _horizontal_scroll = new wxScrollBar (this, wxID_ANY);
  91
  92 #ifndef __WXOSX__
  93         SetDoubleBuffered (true);
  94 #endif
  95
  96         Bind (wxEVT_SIZE, boost::bind(&AudioMappingView::size, this, _1));
  97         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::set_gain_from_menu, this, 0), ID_off);
  98         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::set_gain_from_menu, this, db_to_linear(-6)), ID_minus6dB);
  99         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::set_gain_from_menu, this, 1), ID_0dB);
 100         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::set_gain_from_menu, this, db_to_linear(3)), ID_plus3dB);
 101         Bind (wxEVT_MENU, boost::bind(&AudioMappingView::edit, this), ID_edit);
 102         Bind (wxEVT_MOUSEWHEEL, boost::bind(&AudioMappingView::mouse_wheel, this, _1));
 103         _body->Bind (wxEVT_PAINT, boost::bind(&AudioMappingView::paint, this));
 104         _body->Bind (wxEVT_LEFT_DOWN, boost::bind(&AudioMappingView::left_down, this, _1));
 105         _body->Bind (wxEVT_RIGHT_DOWN, boost::bind(&AudioMappingView::right_down, this, _1));
 106         _body->Bind (wxEVT_MOTION, boost::bind(&AudioMappingView::motion, this, _1));
 107         _vertical_scroll->Bind (wxEVT_SCROLL_TOP, boost::bind(&AudioMappingView::scroll, this));
 108         _vertical_scroll->Bind (wxEVT_SCROLL_BOTTOM, boost::bind(&AudioMappingView::scroll, this));
 109         _vertical_scroll->Bind (wxEVT_SCROLL_LINEUP, boost::bind(&AudioMappingView::scroll, this));
 110         _vertical_scroll->Bind (wxEVT_SCROLL_LINEDOWN, boost::bind(&AudioMappingView::scroll, this));
 111         _vertical_scroll->Bind (wxEVT_SCROLL_PAGEUP, boost::bind(&AudioMappingView::scroll, this));
 112         _vertical_scroll->Bind (wxEVT_SCROLL_PAGEDOWN, boost::bind(&AudioMappingView::scroll, this));
 113         _vertical_scroll->Bind (wxEVT_SCROLL_THUMBTRACK, boost::bind(&AudioMappingView::scroll, this));
 114         _vertical_scroll->Bind (wxEVT_SCROLL_THUMBRELEASE, boost::bind(&AudioMappingView::scroll, this));
 115         _horizontal_scroll->Bind (wxEVT_SCROLL_TOP, boost::bind(&AudioMappingView::scroll, this));
 116         _horizontal_scroll->Bind (wxEVT_SCROLL_BOTTOM, boost::bind(&AudioMappingView::scroll, this));
 117         _horizontal_scroll->Bind (wxEVT_SCROLL_LINEUP, boost::bind(&AudioMappingView::scroll, this));
 118         _horizontal_scroll->Bind (wxEVT_SCROLL_LINEDOWN, boost::bind(&AudioMappingView::scroll, this));
 119         _horizontal_scroll->Bind (wxEVT_SCROLL_PAGEUP, boost::bind(&AudioMappingView::scroll, this));
 120         _horizontal_scroll->Bind (wxEVT_SCROLL_PAGEDOWN, boost::bind(&AudioMappingView::scroll, this));
 121         _horizontal_scroll->Bind (wxEVT_SCROLL_THUMBTRACK, boost::bind(&AudioMappingView::scroll, this));
 122         _horizontal_scroll->Bind (wxEVT_SCROLL_THUMBRELEASE, boost::bind(&AudioMappingView::scroll, this));
 123 }
 124
 125 void
 126 AudioMappingView::size (wxSizeEvent& ev)
 127 {
 128         setup ();
 129         ev.Skip ();
 130 }
 131
 132 void
 133 AudioMappingView::setup ()
 134 {
 135         auto const s = GetSize();
 136         int const w = _vertical_scroll->GetSize().GetWidth();
 137         int const h = _horizontal_scroll->GetSize().GetHeight();
 138
 139         _vertical_scroll->SetPosition (wxPoint(s.GetWidth() - w, 0));
 140         _vertical_scroll->SetSize (wxSize(w, max(0, s.GetHeight() - h)));
 141
 142         _body->SetSize (wxSize(max(0, s.GetWidth() - w), max(0, s.GetHeight() - h)));
 143
 144         _horizontal_scroll->SetPosition (wxPoint(0, s.GetHeight() - h));
 145         _horizontal_scroll->SetSize (wxSize(max(0, s.GetWidth() - w), h));
 146
 147         _vertical_scroll->SetScrollbar (
 148                 _vertical_scroll->GetThumbPosition(),
 149                 s.GetHeight() - h - 8,
 150                 ROW_HEIGHT * (2 + _input_channels.size()),
 151                 ROW_HEIGHT,
 152                 true
 153                 );
 154
 155         wxClientDC dc (GetParent());
 156         dc.SetFont (wxSWISS_FONT->Bold());
 157
 158         _column_widths.clear ();
 159         _column_widths.reserve (_output_channels.size());
 160         _column_widths_total = 0;
 161
 162         for (auto const& i: _output_channels) {
 163                 wxCoord width;
 164                 wxCoord height;
 165                 dc.GetTextExtent (std_to_wx(i.name), &width, &height);
 166                 auto const this_width = max(width + COLUMN_PADDING, MINIMUM_COLUMN_WIDTH);
 167                 _column_widths.push_back (this_width);
 168                 _column_widths_total += this_width;
 169         }
 170
 171         _horizontal_scroll->SetScrollbar (
 172                 _horizontal_scroll->GetThumbPosition(),
 173                 s.GetWidth() - w - 8,
 174                 LEFT_WIDTH + _column_widths_total,
 175                 HORIZONTAL_PAGE_SIZE,
 176                 true);
 177 }
 178
 179 void
 180 AudioMappingView::scroll ()
 181 {
 182         Refresh ();
 183 }
 184
 185 void
 186 AudioMappingView::paint_static (wxDC& dc)
 187 {
 188         dc.SetFont (wxSWISS_FONT->Bold());
 189         wxCoord label_width;
 190         wxCoord label_height;
 191
 192         dc.GetTextExtent (_top_label, &label_width, &label_height);
 193         dc.DrawText (_top_label, LEFT_WIDTH + (_column_widths_total - label_width) / 2, (ROW_HEIGHT - label_height) / 2);
 194
 195         dc.GetTextExtent (_left_label, &label_width, &label_height);
 196         dc.DrawRotatedText (
 197                 _left_label,
 198                 (ROW_HEIGHT - label_height) / 2,
 199                 TOP_HEIGHT + (_input_channels.size() * ROW_HEIGHT + label_width) / 2,
 200                 90
 201                 );
 202
 203         dc.SetFont (*wxSWISS_FONT);
 204 }
 205
 206 void
 207 AudioMappingView::paint_column_labels (wxDC& dc)
 208 {
 209         wxCoord label_width;
 210         wxCoord label_height;
 211         int x = LEFT_WIDTH;
 212         for (auto i = 0U; i < _output_channels.size(); ++i) {
 213                 auto const name = std_to_wx(_output_channels[i].name);
 214                 dc.GetTextExtent (name, &label_width, &label_height);
 215                 dc.DrawText (name, x + (_column_widths[i] - label_width) / 2, ROW_HEIGHT + (ROW_HEIGHT - label_height) / 2);
 216                 x += _column_widths[i];
 217         }
 218
 219         dc.DrawLine(wxPoint(LEFT_WIDTH, ROW_HEIGHT), wxPoint(LEFT_WIDTH + _column_widths_total, ROW_HEIGHT));
 220         dc.DrawLine(wxPoint(LEFT_WIDTH, ROW_HEIGHT * 2), wxPoint(LEFT_WIDTH + _column_widths_total, ROW_HEIGHT * 2));
 221 }
 222
 223 void
 224 AudioMappingView::paint_column_lines (wxDC& dc)
 225 {
 226         int x = LEFT_WIDTH;
 227         for (size_t i = 0; i < _output_channels.size(); ++i) {
 228                 dc.DrawLine (
 229                         wxPoint(x, ROW_HEIGHT),
 230                         wxPoint(x, TOP_HEIGHT + _input_channels.size() * ROW_HEIGHT)
 231                         );
 232                 x += _column_widths[i];
 233         }
 234
 235         dc.DrawLine (
 236                 wxPoint(LEFT_WIDTH + _column_widths_total, ROW_HEIGHT),
 237                 wxPoint(LEFT_WIDTH + _column_widths_total, TOP_HEIGHT + _input_channels.size() * ROW_HEIGHT)
 238                 );
 239 }
 240
 241 void
 242 AudioMappingView::paint_row_labels (wxDC& dc)
 243 {
 244         wxCoord label_width;
 245         wxCoord label_height;
 246
 247         /* Row channel labels */
 248
 249         for (auto i = 0U; i < _input_channels.size(); ++i) {
 250                 auto const name = std_to_wx(_input_channels[i].name);
 251                 dc.GetTextExtent (name, &label_width, &label_height);
 252                 dc.DrawText (name, LEFT_WIDTH - MINIMUM_COLUMN_WIDTH + (MINIMUM_COLUMN_WIDTH - label_width) / 2, TOP_HEIGHT + ROW_HEIGHT * i + (ROW_HEIGHT - label_height) / 2);
 253         }
 254
 255         /* Vertical lines on the left */
 256
 257         for (int i = 1; i < 3; ++i) {
 258                 dc.DrawLine (
 259                         wxPoint(MINIMUM_COLUMN_WIDTH * i, TOP_HEIGHT),
 260                         wxPoint(MINIMUM_COLUMN_WIDTH * i, TOP_HEIGHT + _input_channels.size() * ROW_HEIGHT)
 261                         );
 262         }
 263
 264         int y = TOP_HEIGHT;
 265         for (auto const& i: _input_groups) {
 266                 dc.DrawLine (wxPoint(MINIMUM_COLUMN_WIDTH, y), wxPoint(MINIMUM_COLUMN_WIDTH * 2, y));
 267                 y += (i.to - i.from + 1) * ROW_HEIGHT;
 268         }
 269         dc.DrawLine (wxPoint(MINIMUM_COLUMN_WIDTH, y), wxPoint(MINIMUM_COLUMN_WIDTH * 2, y));
 270
 271         /* Group labels and lines; be careful here as wxDCClipper does not restore the old
 272          * clipping rectangle after it is destroyed
 273          */
 274         y = TOP_HEIGHT;
 275         for (auto const& i: _input_groups) {
 276                 int const height = (i.to - i.from + 1) * ROW_HEIGHT;
 277                 dc.GetTextExtent (std_to_wx(i.name), &label_width, &label_height);
 278                 if (label_width > height) {
 279                         label_width = height - 8;
 280                 }
 281
 282                 {
 283                         wxDCClipper clip (dc, wxRect(MINIMUM_COLUMN_WIDTH, y, ROW_HEIGHT, height));
 284                         int yp = y;
 285                         if ((yp - 2 * ROW_HEIGHT) < dc.GetLogicalOrigin().y) {
 286                                 yp += dc.GetLogicalOrigin().y;
 287                         }
 288
 289                         dc.DrawRotatedText (
 290                                 std_to_wx(i.name),
 291                                 ROW_HEIGHT + (ROW_HEIGHT - label_height) / 2,
 292                                 y + (height + label_width) / 2,
 293                                 90
 294                                 );
 295                 }
 296
 297                 y += height;
 298         }
 299 }
 300
 301 void
 302 AudioMappingView::paint_row_lines (wxDC& dc)
 303 {
 304         for (size_t i = 0; i < _input_channels.size(); ++i) {
 305                 dc.DrawLine (
 306                         wxPoint(MINIMUM_COLUMN_WIDTH * 2, TOP_HEIGHT + ROW_HEIGHT * i),
 307                         wxPoint(LEFT_WIDTH + _column_widths_total, TOP_HEIGHT + ROW_HEIGHT * i)
 308                         );
 309         }
 310         dc.DrawLine (
 311                 wxPoint(MINIMUM_COLUMN_WIDTH * 2, TOP_HEIGHT + ROW_HEIGHT * _input_channels.size()),
 312                 wxPoint(LEFT_WIDTH + _column_widths_total, TOP_HEIGHT + ROW_HEIGHT * _input_channels.size())
 313                 );
 314 }
 315
 316 void
 317 AudioMappingView::paint_indicators (wxDC& dc)
 318 {
 319         /* _{input,output}_channels and _map may not always be in sync, be careful here */
 320         size_t const output = min(_output_channels.size(), size_t(_map.output_channels()));
 321         size_t const input = min(_input_channels.size(), size_t(_map.input_channels()));
 322
 323         int xp = LEFT_WIDTH;
 324         for (size_t x = 0; x < output; ++x) {
 325                 for (size_t y = 0; y < input; ++y) {
 326                         dc.SetBrush (*wxWHITE_BRUSH);
 327                         dc.DrawRectangle (
 328                                 wxRect(
 329                                         xp + (_column_widths[x] - INDICATOR_SIZE) / 2,
 330                                         TOP_HEIGHT + y * ROW_HEIGHT + (ROW_HEIGHT - INDICATOR_SIZE) / 2,
 331                                         INDICATOR_SIZE, INDICATOR_SIZE
 332                                         )
 333                                 );
 334
 335                         float const value_dB = linear_to_db(_map.get(_input_channels[y].index, _output_channels[x].index));
 336                         auto const colour = value_dB <= 0 ? wxColour(0, 255, 0) : wxColour(255, 150, 0);
 337                         int const range = 18;
 338                         int height = 0;
 339                         if (value_dB > -range) {
 340                                 height = min(INDICATOR_SIZE, static_cast<int>(INDICATOR_SIZE * (1 + value_dB / range)));
 341                         }
 342
 343                         dc.SetBrush (*wxTheBrushList->FindOrCreateBrush(colour, wxBRUSHSTYLE_SOLID));
 344                         dc.DrawRectangle (
 345                                 wxRect(
 346                                         xp + (_column_widths[x] - INDICATOR_SIZE) / 2,
 347                                         TOP_HEIGHT + y * ROW_HEIGHT + (ROW_HEIGHT - INDICATOR_SIZE) / 2 + INDICATOR_SIZE - height,
 348                                         INDICATOR_SIZE, height
 349                                         )
 350                                 );
 351
 352                 }
 353                 xp += _column_widths[x];
 354         }
 355 }
 356
 357 static
 358 void clip (wxDC& dc, int x, int y, int w, int h)
 359 {
 360         dc.SetClippingRegion (x, y, w, h);
 361 }
 362
 363 static
 364 void translate (wxDC& dc, int x, int y)
 365 {
 366         dc.SetLogicalOrigin (x, y);
 367 }
 368
 369 static
 370 void restore (wxDC& dc)
 371 {
 372         dc.SetLogicalOrigin (0, 0);
 373         dc.DestroyClippingRegion ();
 374 }
 375
 376 void
 377 AudioMappingView::paint ()
 378 {
 379         wxPaintDC dc (_body);
 380
 381         int const hs = _horizontal_scroll->GetThumbPosition ();
 382         int const vs = _vertical_scroll->GetThumbPosition ();
 383
 384         paint_static (dc);
 385
 386         clip (
 387                 dc,
 388                 LEFT_WIDTH,
 389                 0,
 390                 _column_widths_total,
 391                 ROW_HEIGHT * (2 + _input_channels.size())
 392              );
 393         translate (dc, hs, 0);
 394         paint_column_labels (dc);
 395         restore (dc);
 396
 397         clip (
 398                 dc,
 399                 0,
 400                 TOP_HEIGHT,
 401                 LEFT_WIDTH,
 402                 min(int(ROW_HEIGHT * _input_channels.size()), GetSize().GetHeight() - TOP_HEIGHT) + 1
 403              );
 404         translate (dc, 0, vs);
 405         paint_row_labels (dc);
 406         restore (dc);
 407
 408         clip (
 409                 dc,
 410                 MINIMUM_COLUMN_WIDTH * 2,
 411                 TOP_HEIGHT,
 412                 MINIMUM_COLUMN_WIDTH + _column_widths_total,
 413                 min(int(ROW_HEIGHT * (2 + _input_channels.size())), GetSize().GetHeight() - TOP_HEIGHT)
 414              );
 415         translate (dc, hs, vs);
 416         paint_row_lines (dc);
 417         restore (dc);
 418
 419         clip (
 420                 dc,
 421                 LEFT_WIDTH,
 422                 MINIMUM_COLUMN_WIDTH,
 423                 MINIMUM_COLUMN_WIDTH + _column_widths_total,
 424                 min(int(ROW_HEIGHT * (1 + _input_channels.size())), GetSize().GetHeight() - ROW_HEIGHT)
 425              );
 426         translate (dc, hs, vs);
 427         paint_column_lines (dc);
 428         restore (dc);
 429
 430         clip (
 431                 dc,
 432                 LEFT_WIDTH,
 433                 TOP_HEIGHT,
 434                 _column_widths_total,
 435                 min(int(ROW_HEIGHT * _input_channels.size()), GetSize().GetHeight() - TOP_HEIGHT)
 436              );
 437         translate (dc, hs, vs);
 438         paint_indicators (dc);
 439         restore (dc);
 440 }
 441
 442 optional<pair<NamedChannel, NamedChannel>>
 443 AudioMappingView::mouse_event_to_channels (wxMouseEvent& ev) const
 444 {
 445         int x = ev.GetX() + _horizontal_scroll->GetThumbPosition();
 446         int const y = ev.GetY() + _vertical_scroll->GetThumbPosition();
 447
 448         if (x <= LEFT_WIDTH || y < TOP_HEIGHT) {
 449                 return {};
 450         }
 451
 452         int const input = (y - TOP_HEIGHT) / ROW_HEIGHT;
 453
 454         x -= LEFT_WIDTH;
 455         int output = 0;
 456         for (auto const i: _column_widths) {
 457                 x -= i;
 458                 if (x < 0) {
 459                         break;
 460                 }
 461                 ++output;
 462         }
 463
 464         if (input >= int(_input_channels.size()) || output >= int(_output_channels.size())) {
 465                 return {};
 466         }
 467
 468         return make_pair(_input_channels[input], _output_channels[output]);
 469 }
 470
 471 optional<string>
 472 AudioMappingView::mouse_event_to_input_group_name (wxMouseEvent& ev) const
 473 {
 474         int const x = ev.GetX() + _horizontal_scroll->GetThumbPosition();
 475         if (x < MINIMUM_COLUMN_WIDTH || x > (2 * MINIMUM_COLUMN_WIDTH)) {
 476                 return {};
 477         }
 478
 479         int const y = (ev.GetY() + _vertical_scroll->GetThumbPosition() - TOP_HEIGHT) / ROW_HEIGHT;
 480         for (auto i: _input_groups) {
 481                 if (i.from <= y && y <= i.to) {
 482                         return i.name;
 483                 }
 484         }
 485
 486         return {};
 487 }
 488
 489 void
 490 AudioMappingView::left_down (wxMouseEvent& ev)
 491 {
 492         auto channels = mouse_event_to_channels (ev);
 493         if (!channels) {
 494                 return;
 495         }
 496
 497         if (_map.get(channels->first.index, channels->second.index) > 0) {
 498                 _map.set (channels->first.index, channels->second.index, 0);
 499         } else {
 500                 _map.set (channels->first.index, channels->second.index, 1);
 501         }
 502
 503         map_values_changed ();
 504 }
 505
 506 void
 507 AudioMappingView::right_down (wxMouseEvent& ev)
 508 {
 509         auto channels = mouse_event_to_channels (ev);
 510         if (!channels) {
 511                 return;
 512         }
 513
 514         _menu_input = channels->first.index;
 515         _menu_output = channels->second.index;
 516         PopupMenu (_menu, ev.GetPosition());
 517 }
 518
 519 void
 520 AudioMappingView::mouse_wheel (wxMouseEvent& ev)
 521 {
 522         if (ev.ShiftDown()) {
 523                 _horizontal_scroll->SetThumbPosition (
 524                         _horizontal_scroll->GetThumbPosition() + (ev.GetWheelRotation() > 0 ? -HORIZONTAL_PAGE_SIZE : HORIZONTAL_PAGE_SIZE)
 525                         );
 526
 527         } else {
 528                 _vertical_scroll->SetThumbPosition (
 529                         _vertical_scroll->GetThumbPosition() + (ev.GetWheelRotation() > 0 ? -ROW_HEIGHT : ROW_HEIGHT)
 530                         );
 531         }
 532         Refresh ();
 533 }
 534
 535 /** Called when any gain value has changed */
 536 void
 537 AudioMappingView::map_values_changed ()
 538 {
 539         Changed (_map);
 540         _last_tooltip_channels = boost::none;
 541         Refresh ();
 542 }
 543
 544 void
 545 AudioMappingView::set_gain_from_menu (double linear)
 546 {
 547         _map.set (_menu_input, _menu_output, linear);
 548         map_values_changed ();
 549 }
 550
 551 void
 552 AudioMappingView::edit ()
 553 {
 554         auto dialog = new AudioGainDialog (this, _menu_input, _menu_output, _map.get(_menu_input, _menu_output));
 555         if (dialog->ShowModal() == wxID_OK) {
 556                 _map.set (_menu_input, _menu_output, dialog->value ());
 557                 map_values_changed ();
 558         }
 559
 560         dialog->Destroy ();
 561 }
 562
 563 void
 564 AudioMappingView::set (AudioMapping map)
 565 {
 566         _map = map;
 567         Refresh ();
 568 }
 569
 570 void
 571 AudioMappingView::set_input_channels (vector<NamedChannel> const& channels)
 572 {
 573         _input_channels = channels;
 574         setup ();
 575         Refresh ();
 576 }
 577
 578 void
 579 AudioMappingView::set_output_channels (vector<NamedChannel> const & channels)
 580 {
 581         _output_channels = channels;
 582         setup ();
 583         Refresh ();
 584 }
 585
 586
 587 wxString
 588 AudioMappingView::input_channel_name_with_group (NamedChannel const& n) const
 589 {
 590         optional<wxString> group;
 591         for (auto i: _input_groups) {
 592                 if (i.from <= n.index && n.index <= i.to) {
 593                         group = std_to_wx (i.name);
 594                 }
 595         }
 596
 597         if (group && !group->IsEmpty()) {
 598                 return wxString::Format ("%s/%s", group->data(), std_to_wx(n.name).data());
 599         }
 600
 601         return std_to_wx(n.name);
 602 }
 603
 604
 605 void
 606 AudioMappingView::motion (wxMouseEvent& ev)
 607 {
 608         auto channels = mouse_event_to_channels (ev);
 609         if (channels) {
 610                 if (channels != _last_tooltip_channels) {
 611                         wxString s;
 612                         auto const gain = _map.get(channels->first.index, channels->second.index);
 613                         if (gain == 0) {
 614                                 s = wxString::Format (
 615                                         _("No audio will be passed from %s channel '%s' to %s channel '%s'."),
 616                                         _from,
 617                                         input_channel_name_with_group(channels->first),
 618                                         _to,
 619                                         std_to_wx(channels->second.name)
 620                                         );
 621                         } else if (gain == 1) {
 622                                 s = wxString::Format (
 623                                         _("Audio will be passed from %s channel %s to %s channel %s unaltered."),
 624                                         _from,
 625                                         input_channel_name_with_group(channels->first),
 626                                         _to,
 627                                         std_to_wx(channels->second.name)
 628                                         );
 629                         } else {
 630                                 auto const dB = linear_to_db(gain);
 631                                 s = wxString::Format (
 632                                         _("Audio will be passed from %s channel %s to %s channel %s with gain %.1fdB."),
 633                                         _from,
 634                                         input_channel_name_with_group(channels->first),
 635                                         _to,
 636                                         std_to_wx(channels->second.name),
 637                                         dB
 638                                         );
 639                         }
 640
 641                         SetToolTip (s + " " + _("Right click to change gain."));
 642                 }
 643         } else {
 644                 auto group = mouse_event_to_input_group_name (ev);
 645                 if (group) {
 646                         SetToolTip (std_to_wx(*group));
 647                 } else {
 648                         SetToolTip ("");
 649                 }
 650         }
 651
 652         _last_tooltip_channels = channels;
 653         ev.Skip ();
 654 }
 655
 656 void
 657 AudioMappingView::set_input_groups (vector<Group> const & groups)
 658 {
 659         _input_groups = groups;
 660 }