synfig-studio/trunk/src/gtkmm/widget_timeslider.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file widget_timeslider.cpp
   3 **      \brief Time Slider Widget Implementation File
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2004 Adrian Bentley
   9 **      Copyright (c) 2007, 2008 Chris Moore
  10 **
  11 **      This package is free software; you can redistribute it and/or
  12 **      modify it under the terms of the GNU General Public License as
  13 **      published by the Free Software Foundation; either version 2 of
  14 **      the License, or (at your option) any later version.
  15 **
  16 **      This package is distributed in the hope that it will be useful,
  17 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19 **      General Public License for more details.
  20 **      \endlegal
  21 */
  22 /* ========================================================================= */
  23
  24 /* === H E A D E R S ======================================================= */
  25
  26 #ifdef USING_PCH
  27 #       include "pch.h"
  28 #else
  29 #ifdef HAVE_CONFIG_H
  30 #       include <config.h>
  31 #endif
  32
  33 #include "widget_timeslider.h"
  34
  35 #include <ETL/misc>
  36
  37 #include <cmath>
  38
  39 #include "general.h"
  40
  41 #endif
  42
  43 /* === U S I N G =========================================================== */
  44
  45 using namespace std;
  46 using namespace etl;
  47 using namespace synfig;
  48
  49 using studio::Widget_Timeslider;
  50
  51 /* === M A C R O S ========================================================= */
  52
  53 /* === G L O B A L S ======================================================= */
  54 const double zoominfactor = 0.75;
  55 const double zoomoutfactor = 1/zoominfactor;
  56
  57 /* === P R O C E D U R E S ================================================= */
  58
  59 Gdk::Color get_interp_color(synfig::Interpolation x)
  60 {
  61         switch(x)
  62         {
  63         case INTERPOLATION_TCB:
  64                 return Gdk::Color("#00B000");
  65
  66                 break;
  67
  68         case INTERPOLATION_LINEAR:
  69                 return Gdk::Color("#B0B000");
  70                 break;
  71
  72         case INTERPOLATION_CONSTANT:
  73                 return Gdk::Color("#C70000");
  74                 break;
  75
  76         case INTERPOLATION_HALT:
  77                 return Gdk::Color("#00b0b0");
  78                 break;
  79
  80         case INTERPOLATION_MANUAL:
  81                 return Gdk::Color("#B000B0");
  82                 break;
  83
  84         case INTERPOLATION_UNDEFINED: default:
  85                 return Gdk::Color("#808080");
  86                 break;
  87         }
  88 }
  89
  90 static Gdk::Color
  91 color_darken(Gdk::Color x, float amount)
  92 {
  93         double   red = x.get_red_p()   * amount;
  94         double green = x.get_green_p() * amount;
  95         double  blue = x.get_blue_p()  * amount;
  96
  97         x.set_rgb_p(  red > 1 ? 1 : red,
  98                                 green > 1 ? 1 : green,
  99                                  blue > 1 ? 1 : blue);
 100
 101         return x;
 102 }
 103
 104 void
 105 studio::render_time_point_to_window(
 106         const Glib::RefPtr<Gdk::Drawable>& window,
 107         const Gdk::Rectangle& area,
 108         const synfig::TimePoint &tp,
 109         bool selected
 110 )
 111 {
 112         Glib::RefPtr<Gdk::GC> gc(Gdk::GC::create(window));
 113         const Gdk::Color black("#000000");
 114
 115         if(selected)
 116                 gc->set_line_attributes(2,Gdk::LINE_SOLID,Gdk::CAP_BUTT,Gdk::JOIN_MITER);
 117         else
 118                 gc->set_line_attributes(1,Gdk::LINE_SOLID,Gdk::CAP_BUTT,Gdk::JOIN_MITER);
 119
 120         Gdk::Color color;
 121         std::vector<Gdk::Point> points;
 122
 123 /*-     BEFORE ------------------------------------- */
 124
 125         color=get_interp_color(tp.get_before());
 126         color=color_darken(color,1.0f);
 127         if(selected)color=color_darken(color,1.3f);
 128         gc->set_rgb_fg_color(color);
 129
 130         switch(tp.get_before())
 131         {
 132         case INTERPOLATION_TCB:
 133                 window->draw_arc(
 134                         gc,
 135                         true,
 136                         area.get_x(),
 137                         area.get_y(),
 138                         area.get_width(),
 139                         area.get_height(),
 140                         64*90,
 141                         64*180
 142                 );
 143                 gc->set_rgb_fg_color(black);
 144                 window->draw_arc(
 145                         gc,
 146                         false,
 147                         area.get_x(),
 148                         area.get_y(),
 149                         area.get_width(),
 150                         area.get_height(),
 151                         64*90,
 152                         64*180
 153                 );
 154                 break;
 155
 156         case INTERPOLATION_HALT:
 157                 window->draw_arc(
 158                         gc,
 159                         true,
 160                         area.get_x(),
 161                         area.get_y(),
 162                         area.get_width(),
 163                         area.get_height()*2,
 164                         64*90,
 165                         64*90
 166                 );
 167                 gc->set_rgb_fg_color(black);
 168                 window->draw_arc(
 169                         gc,
 170                         false,
 171                         area.get_x(),
 172                         area.get_y(),
 173                         area.get_width(),
 174                         area.get_height()*2,
 175                         64*90,
 176                         64*90
 177                 );
 178                 break;
 179
 180         case INTERPOLATION_LINEAR:
 181                 points.clear();
 182                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/2,area.get_y()));
 183                 points.push_back(Gdk::Point(area.get_x(),area.get_y()+area.get_height()));
 184                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/2,area.get_y()+area.get_height()));
 185                 window->draw_polygon(gc,true,points);
 186                 gc->set_rgb_fg_color(black);
 187                 window->draw_lines(gc,points);
 188                 break;
 189
 190         case INTERPOLATION_CONSTANT:
 191                 points.clear();
 192                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/2,area.get_y()));
 193                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/4,area.get_y()));
 194                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/4,area.get_y()+area.get_height()/2));
 195                 points.push_back(Gdk::Point(area.get_x(),area.get_y()+area.get_height()/2));
 196                 points.push_back(Gdk::Point(area.get_x(),area.get_y()+area.get_height()));
 197                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/2,area.get_y()+area.get_height()));
 198                 window->draw_polygon(gc,true,points);
 199                 gc->set_rgb_fg_color(black);
 200                 window->draw_lines(gc,points);
 201                 break;
 202
 203         case INTERPOLATION_UNDEFINED: default:
 204                 points.clear();
 205                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/2,area.get_y()));
 206                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/3,area.get_y()));
 207                 points.push_back(Gdk::Point(area.get_x(),area.get_y()+area.get_height()/3));
 208                 points.push_back(Gdk::Point(area.get_x(),area.get_y()+area.get_height()-area.get_height()/3));
 209                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/3,area.get_y()+area.get_height()));
 210                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/2,area.get_y()+area.get_height()));
 211                 window->draw_polygon(gc,true,points);
 212                 gc->set_rgb_fg_color(black);
 213                 window->draw_lines(gc,points);
 214                 break;
 215         }
 216
 217 /*-     AFTER -------------------------------------- */
 218
 219         color=get_interp_color(tp.get_after());
 220         color=color_darken(color,0.8f);
 221         if(selected)color=color_darken(color,1.3f);
 222         gc->set_rgb_fg_color(color);
 223
 224         switch(tp.get_after())
 225         {
 226         case INTERPOLATION_TCB:
 227                 window->draw_arc(
 228                         gc,
 229                         true,
 230                         area.get_x(),
 231                         area.get_y(),
 232                         area.get_width(),
 233                         area.get_height(),
 234                         64*270,
 235                         64*180
 236                 );
 237                 gc->set_rgb_fg_color(black);
 238                 window->draw_arc(
 239                         gc,
 240                         false,
 241                         area.get_x(),
 242                         area.get_y(),
 243                         area.get_width(),
 244                         area.get_height(),
 245                         64*270,
 246                         64*180
 247                 );
 248                 break;
 249
 250         case INTERPOLATION_HALT:
 251                 window->draw_arc(
 252                         gc,
 253                         true,
 254                         area.get_x(),
 255                         area.get_y()-area.get_height(),
 256                         area.get_width(),
 257                         area.get_height()*2,
 258                         64*270,
 259                         64*90
 260                 );
 261                 gc->set_rgb_fg_color(black);
 262                 window->draw_arc(
 263                         gc,
 264                         false,
 265                         area.get_x(),
 266                         area.get_y()-area.get_height(),
 267                         area.get_width(),
 268                         area.get_height()*2,
 269                         64*270,
 270                         64*90
 271                 );
 272                 break;
 273
 274         case INTERPOLATION_LINEAR:
 275                 points.clear();
 276                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/2,area.get_y()));
 277                 points.push_back(Gdk::Point(area.get_x()+area.get_width(),area.get_y()));
 278                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/2,area.get_y()+area.get_height()));
 279                 window->draw_polygon(gc,true,points);
 280                 gc->set_rgb_fg_color(black);
 281                 window->draw_lines(gc,points);
 282                 break;
 283
 284         case INTERPOLATION_CONSTANT:
 285                 points.clear();
 286                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/2,area.get_y()));
 287                 points.push_back(Gdk::Point(area.get_x()+area.get_width(),area.get_y()));
 288                 points.push_back(Gdk::Point(area.get_x()+area.get_width(),area.get_y()+area.get_height()/2));
 289                 points.push_back(Gdk::Point(area.get_x()+area.get_width()-area.get_width()/4,area.get_y()+area.get_height()/2));
 290                 points.push_back(Gdk::Point(area.get_x()+area.get_width()-area.get_width()/4,area.get_y()+area.get_height()));
 291                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/2,area.get_y()+area.get_height()));
 292                 window->draw_polygon(gc,true,points);
 293                 gc->set_rgb_fg_color(black);
 294                 window->draw_lines(gc,points);
 295                 break;
 296
 297         case INTERPOLATION_UNDEFINED: default:
 298                 points.clear();
 299                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/2,area.get_y()));
 300                 points.push_back(Gdk::Point(area.get_x()+area.get_width()-area.get_width()/3,area.get_y()));
 301                 points.push_back(Gdk::Point(area.get_x()+area.get_width(),area.get_y()+area.get_height()/3));
 302                 points.push_back(Gdk::Point(area.get_x()+area.get_width(),area.get_y()+area.get_height()-area.get_height()/3));
 303                 points.push_back(Gdk::Point(area.get_x()+area.get_width()-area.get_width()/3,area.get_y()+area.get_height()));
 304                 points.push_back(Gdk::Point(area.get_x()+area.get_width()/2,area.get_y()+area.get_height()));
 305                 window->draw_polygon(gc,true,points);
 306                 gc->set_rgb_fg_color(black);
 307                 window->draw_lines(gc,points);
 308                 break;
 309         }
 310
 311 }
 312
 313 /* === M E T H O D S ======================================================= */
 314
 315 /* === E N T R Y P O I N T ================================================= */
 316 double defaultfps = 24;
 317 const int fullheight = 20;
 318
 319 Widget_Timeslider::Widget_Timeslider()
 320 :layout(Pango::Layout::create(get_pango_context())),
 321 adj_default(0,0,2,1/defaultfps,10/defaultfps),
 322 adj_timescale(0),
 323 //invalidated(false),
 324 last_event_time(0),
 325 fps(defaultfps),
 326 dragscroll(false)
 327 {
 328         set_size_request(-1,fullheight);
 329
 330         //                click                    scroll                     zoom
 331         add_events( Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK
 332                                 | Gdk::BUTTON_MOTION_MASK | Gdk::SCROLL_MASK );
 333
 334         set_time_adjustment(&adj_default);
 335         //update_times();
 336 }
 337
 338 Widget_Timeslider::~Widget_Timeslider()
 339 {
 340 }
 341
 342 void Widget_Timeslider::set_time_adjustment(Gtk::Adjustment *x)
 343 {
 344         //disconnect old connections
 345         time_value_change.disconnect();
 346         time_other_change.disconnect();
 347
 348         //connect update function to new adjustment
 349         adj_timescale = x;
 350
 351         if(x)
 352         {
 353                 time_value_change = x->signal_value_changed().connect(sigc::mem_fun(*this,&Widget_Timeslider::queue_draw));
 354                 time_other_change = x->signal_changed().connect(sigc::mem_fun(*this,&Widget_Timeslider::queue_draw));
 355                 //invalidated = true;
 356                 //refresh();
 357         }
 358 }
 359
 360 void Widget_Timeslider::set_global_fps(float d)
 361 {
 362         if(fps != d)
 363         {
 364                 fps = d;
 365
 366                 //update everything since we need to redraw already
 367                 //invalidated = true;
 368                 //refresh();
 369                 queue_draw();
 370         }
 371 }
 372
 373 /*void Widget_Timeslider::update_times()
 374 {
 375         if(adj_timescale)
 376         {
 377                 start = adj_timescale->get_lower();
 378                 end = adj_timescale->get_upper();
 379                 current = adj_timescale->get_value();
 380         }
 381 }*/
 382
 383 void Widget_Timeslider::refresh()
 384 {
 385 }
 386 /*
 387 {
 388         if(invalidated)
 389         {
 390                 queue_draw();
 391         }else if(adj_timescale)
 392         {
 393                 double  l = adj_timescale->get_lower(),
 394                                 u = adj_timescale->get_upper(),
 395                                 v = adj_timescale->get_value();
 396
 397                 bool invalid = (l != start) || (u != end) || (v != current);
 398
 399                 start = l;
 400                 end = u;
 401                 current = v;
 402
 403                 if(invalid) queue_draw();
 404         }
 405 }*/
 406
 407 bool Widget_Timeslider::redraw(bool /*doublebuffer*/)
 408 {
 409         Glib::RefPtr<Gdk::Window> window = get_window();
 410
 411         if(!window) return false;
 412
 413         Glib::RefPtr<Gdk::GC>   gc = Gdk::GC::create(window);
 414         if(!gc) return false;
 415
 416         //synfig::info("Drawing Timeslider");
 417         //clear and update to current values
 418         //invalidated = false;
 419         //update_times();
 420
 421         //draw grey rectangle
 422         Gdk::Color      c("#7f7f7f");
 423         gc->set_rgb_fg_color(c);
 424         gc->set_background(c);
 425
 426         //Get the data for the window and the params to draw it...
 427         int w = get_width(), h = get_height();
 428
 429         window->draw_rectangle(gc,true,0,0,w,h);
 430
 431         const double EPSILON = 1e-6;
 432         if(!adj_timescale || w == 0) return true;
 433
 434         //Get the time information since we now know it's valid
 435         double  start = adj_timescale->get_lower(),
 436                         end = adj_timescale->get_upper(),
 437                         current = adj_timescale->get_value();
 438
 439         if(end-start < EPSILON) return true;
 440
 441         //synfig::info("Drawing Lines");
 442
 443         //draw all the time stuff
 444         double dtdp = (end - start)/get_width();
 445         double dpdt = 1/dtdp;
 446
 447         //lines
 448
 449         //Draw the time line...
 450         double tpx = (current-start)*dpdt;
 451         gc->set_rgb_fg_color(Gdk::Color("#ffaf00"));
 452         window->draw_line(gc,round_to_int(tpx),0,round_to_int(tpx),fullheight);
 453
 454         //normal line/text color
 455         gc->set_rgb_fg_color(Gdk::Color("#333333"));
 456
 457         int ifps = round_to_int(fps);
 458         if (ifps < 1) ifps = 1;
 459
 460         std::vector<double> ranges;
 461
 462         unsigned int pos = 0;
 463
 464         // build a list of all the factors of the frame rate
 465         for (int i = 1; i*i <= ifps; i++)
 466                 if ((ifps%i) == 0)
 467                 {
 468                         ranges.insert(ranges.begin()+pos, i/fps);
 469                         if (i*i != ifps)
 470                                 ranges.insert(ranges.begin()+pos+1, ifps/i/fps);
 471                         pos++;
 472                 }
 473
 474         // fill in any gaps where one factor is more than 2 times the previous
 475         std::vector<double>::iterator iter, next;
 476         pos = 0;
 477         for (pos = 0; pos < ranges.size()-1; pos++)
 478         {
 479                 iter = ranges.begin()+pos;
 480                 next = iter+1;
 481                 if (*iter*2 < *next)
 482                         ranges.insert(next, *iter*2);
 483         }
 484
 485         double more_ranges[] = {
 486                 2, 3, 5, 10, 20, 30, 60, 90, 120, 180,
 487                 300, 600, 1200, 1800, 2700, 3600, 3600*2,
 488                 3600*4, 3600*8, 3600*16, 3600*32, 3600*64,
 489                 3600*128, 3600*256, 3600*512, 3600*1024 };
 490
 491         ranges.insert(ranges.end(), more_ranges, more_ranges + sizeof(more_ranges)/sizeof(double));
 492
 493         double lowerrange = dtdp*140, upperrange = dtdp*280;
 494         double midrange = (lowerrange + upperrange)/2;
 495
 496         //find most ideal scale
 497         double scale;
 498         next = binary_find(ranges.begin(), ranges.end(), midrange);
 499         iter = next++;
 500
 501         if (iter == ranges.end()) iter--;
 502         if (next == ranges.end()) next--;
 503
 504         if (abs(*next - midrange) < abs(*iter - midrange))
 505                 iter = next;
 506
 507         scale = *iter;
 508         if (iter != ranges.begin()) iter--;
 509         if (iter != ranges.begin()) iter--;
 510         if (iter != ranges.begin()) iter--;
 511
 512         // subdivide into this many tick marks (8 or less)
 513         const int subdiv = round_to_int(scale / *iter);
 514         time_per_tickmark = scale / subdiv;
 515
 516         //get first valid line and its position in pixel space
 517         double time = 0;
 518         double pixel = 0;
 519
 520         int sdindex = 0;
 521
 522         double subr = scale / subdiv;
 523
 524         //get its position inside...
 525         time = ceil(start/subr)*subr - start;
 526         pixel = time*dpdt;
 527
 528         //absolute time of the line to be drawn
 529         time += start;
 530
 531         { //inside the big'n
 532                 double t = (time/scale - floor(time/scale))*subdiv; // the difference from the big mark in 0:1
 533                 //sdindex = (int)floor(t + 0.5); //get how far through the range it is...
 534                 sdindex = round_to_int(t); //get how far through the range it is...
 535
 536                 //synfig::info("Extracted fr %.2lf -> %d", t, sdindex);
 537         }
 538
 539         //synfig::info("Initial values: %.4lf t, %.1lf pixels, %d i", time,pixel,sdindex);
 540
 541         //loop to draw
 542         const int heightbig = 12;
 543         const int heightsmall = 4;
 544
 545         int width = get_width();
 546         while( pixel < width )
 547         {
 548                 int xpx = round_to_int(pixel);
 549
 550                 //draw big
 551                 if(sdindex == 0)
 552                 {
 553                         window->draw_line(gc,xpx,0,xpx,heightbig);
 554                         //round the time to nearest frame and draw the text
 555                         Time tm((double)time);
 556                         if(get_global_fps()) tm.round(get_global_fps());
 557                         Glib::ustring timecode(tm.get_string(get_global_fps(),App::get_time_format()));
 558
 559                         //gc->set_rgb_fg_color(Gdk::Color("#000000"));
 560                         layout->set_text(timecode);
 561                         window->draw_layout(gc,xpx+2,heightsmall,layout);
 562                 }else
 563                 {
 564                         window->draw_line(gc,xpx,0,xpx,heightsmall);
 565                 }
 566
 567                 //increment time and position
 568                 pixel += subr / dtdp;
 569                 time += subr;
 570
 571                 //increment index
 572                 if(++sdindex >= subdiv) sdindex -= subdiv;
 573         }
 574
 575         return true;
 576 }
 577
 578 bool Widget_Timeslider::on_motion_notify_event(GdkEventMotion* event) //for dragging
 579 {
 580         if(!adj_timescale) return false;
 581
 582         Gdk::ModifierType mod = Gdk::ModifierType(event->state);
 583
 584         //scrolling...
 585
 586         //NOTE: we might want to address the possibility of dragging with both buttons held down
 587
 588         if(mod & Gdk::BUTTON2_MASK)
 589         {
 590
 591                 //we need this for scrolling by dragging
 592                 double  curx = event->x;
 593
 594                 double  start = adj_timescale->get_lower(),
 595                                 end = adj_timescale->get_upper();
 596
 597                 if(dragscroll)
 598                 {
 599                         if(event->time-last_event_time<30)
 600                                 return false;
 601                         else
 602                                 last_event_time=event->time;
 603
 604                         if(abs(lastx - curx) < 1 && end != start) return true;
 605                         //translate the window and correct it
 606
 607                         //update our stuff so we are operating correctly
 608                         //invalidated = true;
 609                         //update_times();
 610
 611                         //Note: Use inverse of mouse movement because of conceptual space relationship
 612                         double diff = lastx - curx; //curx - lastx;
 613
 614                         //NOTE: This might be incorrect...
 615                         //fraction to move...
 616                         double dpx = (end - start)/get_width();
 617                         lastx = curx;
 618
 619                         diff *= dpx;
 620
 621                         //Adjust...
 622                         start += diff;
 623                         end += diff;
 624
 625                         //But clamp to bounds if they exist...
 626                         //HACK - bounds should not be required for this slider
 627                         if(adj_bounds)
 628                         {
 629                                 if(start < adj_bounds->get_lower())
 630                                 {
 631                                         diff = adj_bounds->get_lower() - start;
 632                                         start += diff;
 633                                         end += diff;
 634                                 }
 635
 636                                 if(end > adj_bounds->get_upper())
 637                                 {
 638                                         diff = adj_bounds->get_upper() - end;
 639                                         start += diff;
 640                                         end += diff;
 641                                 }
 642                         }
 643
 644                         //synfig::info("Scrolling timerange to (%.4f,%.4f)",start,end);
 645
 646                         adj_timescale->set_lower(start);
 647                         adj_timescale->set_upper(end);
 648
 649                         adj_timescale->changed();
 650                 }else
 651                 {
 652                         dragscroll = true;
 653                         lastx = curx;
 654                         //lasty = cury;
 655                 }
 656
 657                 return true;
 658         }
 659
 660         if(mod & Gdk::BUTTON1_MASK)
 661         {
 662                 double curx = event->x;
 663
 664                 //get time from drag...
 665                 double  start = adj_timescale->get_lower(),
 666                                 end = adj_timescale->get_upper(),
 667                                 current = adj_timescale->get_value();
 668                 double t = start + curx*(end - start)/get_width();
 669
 670                 //snap it to fps - if they exist...
 671                 if(fps)
 672                 {
 673                         t = floor(t*fps + 0.5)/fps;
 674                 }
 675
 676                 //set time if needed
 677                 if(current != t)
 678                 {
 679                         adj_timescale->set_value(t);
 680
 681                         //Fixed this to actually do what it's supposed to...
 682                         if(event->time-last_event_time>50)
 683                         {
 684                                 adj_timescale->value_changed();
 685                                 last_event_time = event->time;
 686                         }
 687                 }
 688
 689                 return true;
 690         }
 691
 692         return false;
 693 }
 694
 695 bool Widget_Timeslider::on_scroll_event(GdkEventScroll* event) //for zooming
 696 {
 697         if(!adj_timescale) return false;
 698
 699         //Update so we are calculating based on current values
 700         //update_times();
 701
 702         //figure out if we should center ourselves on the current time
 703         bool center = false;
 704
 705         //we want to zoom in on the time value if control is held down
 706         if(Gdk::ModifierType(event->state) & Gdk::CONTROL_MASK)
 707                 center = true;
 708
 709         switch(event->direction)
 710         {
 711                 case GDK_SCROLL_UP: //zoom in
 712                         zoom_in(center);
 713                         return true;
 714
 715                 case GDK_SCROLL_DOWN: //zoom out
 716                         zoom_out(center);
 717                         return true;
 718
 719                 case GDK_SCROLL_RIGHT:
 720                 case GDK_SCROLL_LEFT:
 721                 {
 722                         double t = adj_timescale->get_value();
 723                         double orig_t = t;
 724                         double start = adj_timescale->get_lower();
 725                         double end = adj_timescale->get_upper();
 726                         double lower = adj_bounds->get_lower();
 727                         double upper = adj_bounds->get_upper();
 728                         double adj = time_per_tickmark;
 729
 730                         if( event->direction == GDK_SCROLL_RIGHT )
 731                         {
 732                                 // step forward one tick
 733                                 t += adj;
 734
 735                                 // don't go past the end of time
 736                                 if (t > upper)
 737                                         t = upper;
 738
 739                                 // if we are already in the right half of the slider
 740                                 if ((t-start)*2 > (end-start))
 741                                 {
 742                                         // if we can't scroll the background left one whole tick, scroll it to the end
 743                                         if (end > upper - (t-orig_t))
 744                                         {
 745                                                 adj_timescale->set_lower(upper - (end-start));
 746                                                 adj_timescale->set_upper(upper);
 747                                         }
 748                                         // else scroll the background left
 749                                         else
 750                                         {
 751                                                 adj_timescale->set_lower(start + (t-orig_t));
 752                                                 adj_timescale->set_upper(start + (t-orig_t) + (end-start));
 753                                         }
 754                                 }
 755                         }
 756                         else
 757                         {
 758                                 // step backwards one tick
 759                                 t -= adj;
 760
 761                                 // don't go past the start of time
 762                                 if (t < lower)
 763                                         t = lower;
 764
 765                                 // if we are already in the left half of the slider
 766                                 if ((t-start)*2 < (end-start))
 767                                 {
 768                                         // if we can't scroll the background right one whole tick, scroll it to the beginning
 769                                         if (start < lower + (orig_t-t))
 770                                         {
 771                                                 adj_timescale->set_lower(lower);
 772                                                 adj_timescale->set_upper(lower + (end-start));
 773                                         }
 774                                         // else scroll the background right
 775                                         else
 776                                         {
 777                                                 adj_timescale->set_lower(start - (orig_t-t));
 778                                                 adj_timescale->set_upper(start - (orig_t-t) + (end-start));
 779                                         }
 780                                 }
 781                         }
 782
 783                         if(adj_timescale)
 784                         {
 785                                 adj_timescale->set_value(t);
 786                                 adj_timescale->value_changed();
 787                         }
 788                         return true;
 789                 }
 790                 default:
 791                         return false;
 792         }
 793 }
 794
 795 void Widget_Timeslider::zoom_in(bool centerontime)
 796 {
 797         if(!adj_timescale) return;
 798
 799         double  start = adj_timescale->get_lower(),
 800                         end = adj_timescale->get_upper(),
 801                         current = adj_timescale->get_value();
 802
 803         double focuspoint = centerontime ? current : (start + end)/2;
 804
 805         //calculate new beginning and end
 806         end = focuspoint + (end-focuspoint)*zoominfactor;
 807         start = focuspoint + (start-focuspoint)*zoominfactor;
 808
 809         //synfig::info("Zooming in timerange to (%.4f,%.4f)",start,end);
 810         if(adj_bounds)
 811         {
 812                 if(start < adj_bounds->get_lower())
 813                 {
 814                         start = adj_bounds->get_lower();
 815                 }
 816
 817                 if(end > adj_bounds->get_upper())
 818                 {
 819                         end = adj_bounds->get_upper();
 820                 }
 821         }
 822
 823         //reset values
 824         adj_timescale->set_lower(start);
 825         adj_timescale->set_upper(end);
 826
 827         //call changed function
 828         adj_timescale->changed();
 829 }
 830
 831 void Widget_Timeslider::zoom_out(bool centerontime)
 832 {
 833         if(!adj_timescale) return;
 834
 835         double  start = adj_timescale->get_lower(),
 836                         end = adj_timescale->get_upper(),
 837                         current = adj_timescale->get_value();
 838
 839         double focuspoint = centerontime ? current : (start + end)/2;
 840
 841         //calculate new beginning and end
 842         end = focuspoint + (end-focuspoint)*zoomoutfactor;
 843         start = focuspoint + (start-focuspoint)*zoomoutfactor;
 844
 845         //synfig::info("Zooming out timerange to (%.4f,%.4f)",start,end);
 846         if(adj_bounds)
 847         {
 848                 if(start < adj_bounds->get_lower())
 849                 {
 850                         start = adj_bounds->get_lower();
 851                 }
 852
 853                 if(end > adj_bounds->get_upper())
 854                 {
 855                         end = adj_bounds->get_upper();
 856                 }
 857         }
 858
 859         //reset values
 860         adj_timescale->set_lower(start);
 861         adj_timescale->set_upper(end);
 862
 863         //call changed function
 864         adj_timescale->changed();
 865 }
 866
 867 bool Widget_Timeslider::on_button_press_event(GdkEventButton *event) //for clicking
 868 {
 869         switch(event->button)
 870         {
 871                 //time click...
 872                 case 1:
 873                 {
 874                         double  start = adj_timescale->get_lower(),
 875                                         end = adj_timescale->get_upper(),
 876                                         current = adj_timescale->get_value();
 877
 878                         double w = get_width();
 879                         double t = start + (end - start) * event->x / w;
 880
 881                         t = floor(t*fps + 0.5)/fps;
 882
 883                         /*synfig::info("Clicking time from %.3lf to %.3lf [(%.2lf,%.2lf) %.2lf / %.2lf ... %.2lf",
 884                                                 current, vt, start, end, event->x, w, fps);*/
 885
 886                         if(t != current)
 887                         {
 888                                 current = t;
 889
 890                                 if(adj_timescale)
 891                                 {
 892                                         adj_timescale->set_value(current);
 893                                         adj_timescale->value_changed();
 894                                 }
 895                         }
 896
 897                         break;
 898                 }
 899
 900                 //scroll click
 901                 case 2:
 902                 {
 903                         //start dragging
 904                         dragscroll = true;
 905                         lastx = event->x;
 906                         //lasty = event->y;
 907
 908                         return true;
 909                 }
 910
 911                 default:
 912                 {
 913                         break;
 914                 }
 915         }
 916
 917         return false;
 918 }
 919
 920 bool Widget_Timeslider::on_button_release_event(GdkEventButton *event) //end drag
 921 {
 922         switch(event->button)
 923         {
 924                 case 2:
 925                 {
 926                         //start dragging
 927                         dragscroll = false;
 928                         return true;
 929                 }
 930
 931                 default:
 932                 {
 933                         break;
 934                 }
 935         }
 936
 937         return false;
 938 }