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