src/wx/timeline.cc

   1 /*
   2     Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <list>
  21 #include <wx/graphics.h>
  22 #include <boost/weak_ptr.hpp>
  23 #include "film.h"
  24 #include "timeline.h"
  25 #include "wx_util.h"
  26 #include "playlist.h"
  27
  28 using std::list;
  29 using std::cout;
  30 using std::max;
  31 using boost::shared_ptr;
  32 using boost::weak_ptr;
  33 using boost::dynamic_pointer_cast;
  34 using boost::bind;
  35
  36 class View
  37 {
  38 public:
  39         View (Timeline& t)
  40                 : _timeline (t)
  41         {
  42
  43         }
  44
  45         void paint (wxGraphicsContext* g)
  46         {
  47                 _last_paint_bbox = bbox ();
  48                 do_paint (g);
  49         }
  50
  51         void force_redraw ()
  52         {
  53                 _timeline.force_redraw (_last_paint_bbox);
  54                 _timeline.force_redraw (bbox ());
  55         }
  56
  57         virtual Rect bbox () const = 0;
  58
  59 protected:
  60         virtual void do_paint (wxGraphicsContext *) = 0;
  61
  62         int time_x (Time t) const
  63         {
  64                 return _timeline.tracks_position().x + t * _timeline.pixels_per_time_unit();
  65         }
  66
  67         Timeline& _timeline;
  68
  69 private:
  70         Rect _last_paint_bbox;
  71 };
  72
  73 class ContentView : public View
  74 {
  75 public:
  76         ContentView (Timeline& tl, shared_ptr<Content> c, int t)
  77                 : View (tl)
  78                 , _content (c)
  79                 , _track (t)
  80                 , _selected (false)
  81         {
  82                 _content_connection = c->Changed.connect (bind (&ContentView::content_changed, this, _2));
  83         }
  84
  85         Rect bbox () const
  86         {
  87                 shared_ptr<const Film> film = _timeline.film ();
  88                 shared_ptr<const Content> content = _content.lock ();
  89                 if (!film || !content) {
  90                         return Rect ();
  91                 }
  92
  93                 return Rect (
  94                         time_x (content->start ()) - 8,
  95                         y_pos (_track) - 8,
  96                         content->length () * _timeline.pixels_per_time_unit() + 16,
  97                         _timeline.track_height() + 16
  98                         );
  99         }
 100
 101         void set_selected (bool s) {
 102                 _selected = s;
 103                 force_redraw ();
 104         }
 105
 106         bool selected () const {
 107                 return _selected;
 108         }
 109
 110         weak_ptr<Content> content () const {
 111                 return _content;
 112         }
 113
 114         void set_track (int t) {
 115                 _track = t;
 116         }
 117
 118         int track () const {
 119                 return _track;
 120         }
 121
 122         virtual wxString type () const = 0;
 123         virtual wxColour colour () const = 0;
 124
 125 private:
 126
 127         void do_paint (wxGraphicsContext* gc)
 128         {
 129                 shared_ptr<const Film> film = _timeline.film ();
 130                 shared_ptr<const Content> content = _content.lock ();
 131                 if (!film || !content) {
 132                         return;
 133                 }
 134
 135                 Time const start = content->start ();
 136                 Time const len = content->length ();
 137
 138                 wxColour selected (colour().Red() / 2, colour().Green() / 2, colour().Blue() / 2);
 139
 140                 gc->SetPen (*wxBLACK_PEN);
 141
 142 #if wxMAJOR_VERSION == 2 && wxMINOR_VERSION >= 9
 143                 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 4, wxPENSTYLE_SOLID));
 144                 if (_selected) {
 145                         gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (selected, wxBRUSHSTYLE_SOLID));
 146                 } else {
 147                         gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (colour(), wxBRUSHSTYLE_SOLID));
 148                 }
 149 #else
 150                 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 4, wxSOLID));
 151                 if (_selected) {
 152                         gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (selected, wxSOLID));
 153                 } else {
 154                         gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (colour(), wxSOLID));
 155                 }
 156 #endif
 157
 158                 wxGraphicsPath path = gc->CreatePath ();
 159                 path.MoveToPoint    (time_x (start),       y_pos (_track) + 4);
 160                 path.AddLineToPoint (time_x (start + len), y_pos (_track) + 4);
 161                 path.AddLineToPoint (time_x (start + len), y_pos (_track + 1) - 4);
 162                 path.AddLineToPoint (time_x (start),       y_pos (_track + 1) - 4);
 163                 path.AddLineToPoint (time_x (start),       y_pos (_track) + 4);
 164                 gc->StrokePath (path);
 165                 gc->FillPath (path);
 166
 167                 wxString name = wxString::Format (wxT ("%s [%s]"), std_to_wx (content->file().filename().string()).data(), type().data());
 168                 wxDouble name_width;
 169                 wxDouble name_height;
 170                 wxDouble name_descent;
 171                 wxDouble name_leading;
 172                 gc->GetTextExtent (name, &name_width, &name_height, &name_descent, &name_leading);
 173
 174                 gc->Clip (wxRegion (time_x (start), y_pos (_track), len * _timeline.pixels_per_time_unit(), _timeline.track_height()));
 175                 gc->DrawText (name, time_x (start) + 12, y_pos (_track + 1) - name_height - 4);
 176                 gc->ResetClip ();
 177         }
 178
 179         int y_pos (int t) const
 180         {
 181                 return _timeline.tracks_position().y + t * _timeline.track_height();
 182         }
 183
 184         void content_changed (int p)
 185         {
 186                 if (p == ContentProperty::START || p == VideoContentProperty::VIDEO_LENGTH) {
 187                         force_redraw ();
 188                 }
 189         }
 190
 191         boost::weak_ptr<Content> _content;
 192         int _track;
 193         bool _selected;
 194
 195         boost::signals2::scoped_connection _content_connection;
 196 };
 197
 198 class AudioContentView : public ContentView
 199 {
 200 public:
 201         AudioContentView (Timeline& tl, shared_ptr<Content> c, int t)
 202                 : ContentView (tl, c, t)
 203         {}
 204
 205 private:
 206         wxString type () const
 207         {
 208                 return _("audio");
 209         }
 210
 211         wxColour colour () const
 212         {
 213                 return wxColour (149, 121, 232, 255);
 214         }
 215 };
 216
 217 class VideoContentView : public ContentView
 218 {
 219 public:
 220         VideoContentView (Timeline& tl, shared_ptr<Content> c, int t)
 221                 : ContentView (tl, c, t)
 222         {}
 223
 224 private:
 225
 226         wxString type () const
 227         {
 228                 return _("video");
 229         }
 230
 231         wxColour colour () const
 232         {
 233                 return wxColour (242, 92, 120, 255);
 234         }
 235 };
 236
 237 class TimeAxisView : public View
 238 {
 239 public:
 240         TimeAxisView (Timeline& tl, int y)
 241                 : View (tl)
 242                 , _y (y)
 243         {}
 244
 245         void do_paint (wxGraphicsContext* gc)
 246         {
 247 #if wxMAJOR_VERSION == 2 && wxMINOR_VERSION >= 9
 248                 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 1, wxPENSTYLE_SOLID));
 249 #else
 250                 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 1, wxSOLID));
 251 #endif
 252
 253                 int mark_interval = rint (128 / (TIME_HZ * _timeline.pixels_per_time_unit ()));
 254                 if (mark_interval > 5) {
 255                         mark_interval -= mark_interval % 5;
 256                 }
 257                 if (mark_interval > 10) {
 258                         mark_interval -= mark_interval % 10;
 259                 }
 260                 if (mark_interval > 60) {
 261                         mark_interval -= mark_interval % 60;
 262                 }
 263                 if (mark_interval > 3600) {
 264                         mark_interval -= mark_interval % 3600;
 265                 }
 266
 267                 if (mark_interval < 1) {
 268                         mark_interval = 1;
 269                 }
 270
 271                 wxGraphicsPath path = gc->CreatePath ();
 272                 path.MoveToPoint (_timeline.x_offset(), _y);
 273                 path.AddLineToPoint (_timeline.width(), _y);
 274                 gc->StrokePath (path);
 275
 276                 Time t = 0;
 277                 while ((t * _timeline.pixels_per_time_unit()) < _timeline.width()) {
 278                         wxGraphicsPath path = gc->CreatePath ();
 279                         path.MoveToPoint (time_x (t), _y - 4);
 280                         path.AddLineToPoint (time_x (t), _y + 4);
 281                         gc->StrokePath (path);
 282
 283                         int tc = t / TIME_HZ;
 284                         int const h = tc / 3600;
 285                         tc -= h * 3600;
 286                         int const m = tc / 60;
 287                         tc -= m * 60;
 288                         int const s = tc;
 289
 290                         wxString str = wxString::Format (wxT ("%02d:%02d:%02d"), h, m, s);
 291                         wxDouble str_width;
 292                         wxDouble str_height;
 293                         wxDouble str_descent;
 294                         wxDouble str_leading;
 295                         gc->GetTextExtent (str, &str_width, &str_height, &str_descent, &str_leading);
 296
 297                         int const tx = _timeline.x_offset() + t * _timeline.pixels_per_time_unit();
 298                         if ((tx + str_width) < _timeline.width()) {
 299                                 gc->DrawText (str, time_x (t), _y + 16);
 300                         }
 301
 302                         t += mark_interval * TIME_HZ;
 303                 }
 304         }
 305
 306         Rect bbox () const
 307         {
 308                 return Rect (0, _y - 4, _timeline.width(), 24);
 309         }
 310
 311 private:
 312         int _y;
 313 };
 314
 315 Timeline::Timeline (wxWindow* parent, shared_ptr<const Film> film)
 316         : wxPanel (parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE)
 317         , _film (film)
 318         , _tracks (0)
 319         , _pixels_per_time_unit (0)
 320         , _left_down (false)
 321         , _down_view_start (0)
 322         , _first_move (false)
 323 {
 324         SetDoubleBuffered (true);
 325
 326         setup_pixels_per_time_unit ();
 327
 328         Connect (wxID_ANY, wxEVT_PAINT, wxPaintEventHandler (Timeline::paint), 0, this);
 329         Connect (wxID_ANY, wxEVT_LEFT_DOWN, wxMouseEventHandler (Timeline::left_down), 0, this);
 330         Connect (wxID_ANY, wxEVT_LEFT_UP, wxMouseEventHandler (Timeline::left_up), 0, this);
 331         Connect (wxID_ANY, wxEVT_MOTION, wxMouseEventHandler (Timeline::mouse_moved), 0, this);
 332         Connect (wxID_ANY, wxEVT_SIZE, wxSizeEventHandler (Timeline::resized), 0, this);
 333
 334         playlist_changed ();
 335
 336         SetMinSize (wxSize (640, tracks() * track_height() + 96));
 337
 338         _playlist_connection = film->playlist()->Changed.connect (bind (&Timeline::playlist_changed, this));
 339 }
 340
 341 void
 342 Timeline::paint (wxPaintEvent &)
 343 {
 344         wxPaintDC dc (this);
 345
 346         wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
 347         if (!gc) {
 348                 return;
 349         }
 350
 351         gc->SetFont (gc->CreateFont (*wxNORMAL_FONT));
 352
 353         for (list<shared_ptr<View> >::iterator i = _views.begin(); i != _views.end(); ++i) {
 354                 (*i)->paint (gc);
 355         }
 356
 357         delete gc;
 358 }
 359
 360 void
 361 Timeline::playlist_changed ()
 362 {
 363         shared_ptr<const Film> fl = _film.lock ();
 364         if (!fl) {
 365                 return;
 366         }
 367
 368         _views.clear ();
 369
 370         Playlist::ContentList content = fl->playlist()->content ();
 371
 372         for (Playlist::ContentList::iterator i = content.begin(); i != content.end(); ++i) {
 373                 if (dynamic_pointer_cast<VideoContent> (*i)) {
 374                         _views.push_back (shared_ptr<View> (new VideoContentView (*this, *i, 0)));
 375                 }
 376                 if (dynamic_pointer_cast<AudioContent> (*i)) {
 377                         _views.push_back (shared_ptr<View> (new AudioContentView (*this, *i, 0)));
 378                 }
 379         }
 380
 381         assign_tracks ();
 382
 383         _views.push_back (shared_ptr<View> (new TimeAxisView (*this, tracks() * track_height() + 32)));
 384
 385         Refresh ();
 386 }
 387
 388 void
 389 Timeline::assign_tracks ()
 390 {
 391         for (list<shared_ptr<View> >::iterator i = _views.begin(); i != _views.end(); ++i) {
 392                 shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
 393                 if (cv) {
 394                         cv->set_track (0);
 395                 }
 396         }
 397
 398         for (list<shared_ptr<View> >::iterator i = _views.begin(); i != _views.end(); ++i) {
 399                 shared_ptr<AudioContentView> acv = dynamic_pointer_cast<AudioContentView> (*i);
 400                 if (!acv) {
 401                         continue;
 402                 }
 403
 404                 shared_ptr<Content> acv_content = acv->content().lock ();
 405                 assert (acv_content);
 406
 407                 int t = 1;
 408                 while (1) {
 409                         list<shared_ptr<View> >::iterator j = _views.begin();
 410                         while (j != _views.end()) {
 411                                 shared_ptr<AudioContentView> test = dynamic_pointer_cast<AudioContentView> (*j);
 412                                 if (!test) {
 413                                         ++j;
 414                                         continue;
 415                                 }
 416
 417                                 shared_ptr<Content> test_content = test->content().lock ();
 418                                 assert (test_content);
 419
 420                                 if (test && test->track() == t) {
 421                                         if ((acv_content->start() <= test_content->start() && test_content->start() <= acv_content->end()) ||
 422                                             (acv_content->start() <= test_content->end()   && test_content->end()   <= acv_content->end())) {
 423                                                 /* we have an overlap on track `t' */
 424                                                 ++t;
 425                                                 break;
 426                                         }
 427                                 }
 428
 429                                 ++j;
 430                         }
 431
 432                         if (j == _views.end ()) {
 433                                 /* no overlap on `t' */
 434                                 break;
 435                         }
 436                 }
 437
 438                 acv->set_track (t);
 439                 _tracks = max (_tracks, t + 1);
 440         }
 441 }
 442
 443 int
 444 Timeline::tracks () const
 445 {
 446         return _tracks;
 447 }
 448
 449 void
 450 Timeline::setup_pixels_per_time_unit ()
 451 {
 452         shared_ptr<const Film> film = _film.lock ();
 453         if (!film) {
 454                 return;
 455         }
 456
 457         _pixels_per_time_unit = static_cast<double>(width() - x_offset() * 2) / film->length();
 458 }
 459
 460 void
 461 Timeline::left_down (wxMouseEvent& ev)
 462 {
 463         list<shared_ptr<View> >::iterator i = _views.begin();
 464         Position const p (ev.GetX(), ev.GetY());
 465         while (i != _views.end() && !(*i)->bbox().contains (p)) {
 466                 ++i;
 467         }
 468
 469         _down_view.reset ();
 470
 471         if (i != _views.end ()) {
 472                 shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
 473                 if (cv) {
 474                         _down_view = cv;
 475                         shared_ptr<Content> c = cv->content().lock();
 476                         assert (c);
 477                         _down_view_start = c->start ();
 478                 }
 479         }
 480
 481         for (list<shared_ptr<View> >::iterator j = _views.begin(); j != _views.end(); ++j) {
 482                 shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*j);
 483                 if (cv) {
 484                         cv->set_selected (i == j);
 485                 }
 486         }
 487
 488         _left_down = true;
 489         _down_point = ev.GetPosition ();
 490         _first_move = false;
 491 }
 492
 493 void
 494 Timeline::left_up (wxMouseEvent &)
 495 {
 496         _left_down = false;
 497 }
 498
 499 void
 500 Timeline::mouse_moved (wxMouseEvent& ev)
 501 {
 502         if (!_left_down) {
 503                 return;
 504         }
 505
 506         wxPoint const p = ev.GetPosition();
 507
 508         if (!_first_move) {
 509                 int const dist = sqrt (pow (p.x - _down_point.x, 2) + pow (p.y - _down_point.y, 2));
 510                 if (dist < 8) {
 511                         return;
 512                 }
 513                 _first_move = true;
 514         }
 515
 516         Time const time_diff = (p.x - _down_point.x) / _pixels_per_time_unit;
 517         if (_down_view) {
 518                 shared_ptr<Content> c = _down_view->content().lock();
 519                 if (c) {
 520                         c->set_start (max (static_cast<Time> (0), _down_view_start + time_diff));
 521                 }
 522         }
 523 }
 524
 525 void
 526 Timeline::force_redraw (Rect const & r)
 527 {
 528         RefreshRect (wxRect (r.x, r.y, r.width, r.height), false);
 529 }
 530
 531 shared_ptr<const Film>
 532 Timeline::film () const
 533 {
 534         return _film.lock ();
 535 }
 536
 537 void
 538 Timeline::resized (wxSizeEvent &)
 539 {
 540         setup_pixels_per_time_unit ();
 541 }