gtk2_ardour/editor_canvas.cc

   1 /*
   2     Copyright (C) 2005 Paul Davis
   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 <libgnomecanvasmm/init.h>
  21 #include <libgnomecanvasmm/pixbuf.h>
  22 #include <jack/types.h>
  23 #include <gtkmm2ext/utils.h>
  24
  25 #include <ardour/audioregion.h>
  26 #include <ardour/profile.h>
  27
  28 #include "ardour_ui.h"
  29 #include "editor.h"
  30 #include "waveview.h"
  31 #include "simplerect.h"
  32 #include "simpleline.h"
  33 #include "imageframe.h"
  34 #include "waveview_p.h"
  35 #include "simplerect_p.h"
  36 #include "simpleline_p.h"
  37 #include "imageframe_p.h"
  38 #include "canvas_impl.h"
  39 #include "editing.h"
  40 #include "rgb_macros.h"
  41 #include "utils.h"
  42 #include "time_axis_view.h"
  43 #include "audio_time_axis.h"
  44
  45 #include "i18n.h"
  46
  47 using namespace std;
  48 using namespace sigc;
  49 using namespace ARDOUR;
  50 using namespace PBD;
  51 using namespace Gtk;
  52 using namespace Glib;
  53 using namespace Gtkmm2ext;
  54 using namespace Editing;
  55
  56 /* XXX this is a hack. it ought to be the maximum value of an nframes_t */
  57
  58 const double max_canvas_coordinate = (double) JACK_MAX_FRAMES;
  59
  60 extern "C"
  61 {
  62
  63 GType gnome_canvas_simpleline_get_type(void);
  64 GType gnome_canvas_simplerect_get_type(void);
  65 GType gnome_canvas_waveview_get_type(void);
  66 GType gnome_canvas_imageframe_get_type(void);
  67
  68 }
  69
  70 static void ardour_canvas_type_init()
  71 {
  72         // Map gtypes to gtkmm wrapper-creation functions:
  73
  74         Glib::wrap_register(gnome_canvas_simpleline_get_type(), &Gnome::Canvas::SimpleLine_Class::wrap_new);
  75         Glib::wrap_register(gnome_canvas_simplerect_get_type(), &Gnome::Canvas::SimpleRect_Class::wrap_new);
  76         Glib::wrap_register(gnome_canvas_waveview_get_type(), &Gnome::Canvas::WaveView_Class::wrap_new);
  77         Glib::wrap_register(gnome_canvas_imageframe_get_type(), &Gnome::Canvas::ImageFrame_Class::wrap_new);
  78
  79         // Register the gtkmm gtypes:
  80
  81         (void) Gnome::Canvas::WaveView::get_type();
  82         (void) Gnome::Canvas::SimpleLine::get_type();
  83         (void) Gnome::Canvas::SimpleRect::get_type();
  84         (void) Gnome::Canvas::ImageFrame::get_type();
  85 }
  86
  87 void
  88 Editor::initialize_canvas ()
  89 {
  90         ArdourCanvas::init ();
  91         ardour_canvas_type_init ();
  92
  93         /* don't try to center the canvas */
  94
  95         track_canvas.set_center_scroll_region (false);
  96         track_canvas.set_dither         (Gdk::RGB_DITHER_NONE);
  97
  98         /* need to handle 4 specific types of events as catch-alls */
  99
 100         track_canvas.signal_scroll_event().connect (mem_fun (*this, &Editor::track_canvas_scroll_event));
 101         track_canvas.signal_motion_notify_event().connect (mem_fun (*this, &Editor::track_canvas_motion_notify_event));
 102         track_canvas.signal_button_press_event().connect (mem_fun (*this, &Editor::track_canvas_button_press_event));
 103         track_canvas.signal_button_release_event().connect (mem_fun (*this, &Editor::track_canvas_button_release_event));
 104
 105         /* just scroll stuff for the timecanvas */
 106         time_canvas.signal_scroll_event().connect (mem_fun (*this, &Editor::time_canvas_scroll_event));
 107
 108         track_canvas.set_name ("EditorMainCanvas");
 109         track_canvas.add_events (Gdk::POINTER_MOTION_HINT_MASK|Gdk::SCROLL_MASK);
 110         track_canvas.signal_leave_notify_event().connect (mem_fun(*this, &Editor::left_track_canvas));
 111         track_canvas.set_flags (CAN_FOCUS);
 112
 113         /* set up drag-n-drop */
 114
 115         vector<TargetEntry> target_table;
 116
 117         // Drag-N-Drop from the region list can generate this target
 118         target_table.push_back (TargetEntry ("regions"));
 119
 120         target_table.push_back (TargetEntry ("text/plain"));
 121         target_table.push_back (TargetEntry ("text/uri-list"));
 122         target_table.push_back (TargetEntry ("application/x-rootwin-drop"));
 123
 124         track_canvas.drag_dest_set (target_table);
 125         track_canvas.signal_drag_data_received().connect (mem_fun(*this, &Editor::track_canvas_drag_data_received));
 126
 127         /* stuff for the verbose canvas cursor */
 128
 129         Pango::FontDescription* font = get_font_for_style (N_("VerboseCanvasCursor"));
 130
 131         verbose_canvas_cursor = new ArdourCanvas::Text (*track_canvas.root());
 132         verbose_canvas_cursor->property_font_desc() = *font;
 133         verbose_canvas_cursor->property_anchor() = ANCHOR_NW;
 134
 135         delete font;
 136
 137         verbose_cursor_visible = false;
 138
 139         /* on the bottom, an image */
 140
 141         if (Profile->get_sae()) {
 142                 Image img (::get_icon (X_("saelogo")));
 143                 logo_item = new ArdourCanvas::Pixbuf (*track_canvas.root(), 0.0, 0.0, img.get_pixbuf());
 144                 // logo_item->property_height_in_pixels() = true;
 145                 // logo_item->property_width_in_pixels() = true;
 146                 // logo_item->property_height_set() = true;
 147                 // logo_item->property_width_set() = true;
 148                 logo_item->show ();
 149         }
 150
 151         /* a group to hold time (measure) lines */
 152
 153         time_line_group = new ArdourCanvas::Group (*track_canvas.root(), 0.0, 0.0);
 154         cursor_group = new ArdourCanvas::Group (*track_canvas.root(), 0.0, 0.0);
 155
 156         time_canvas.set_name ("EditorTimeCanvas");
 157         time_canvas.add_events (Gdk::POINTER_MOTION_HINT_MASK);
 158         time_canvas.set_flags (CAN_FOCUS);
 159         time_canvas.set_center_scroll_region (false);
 160         time_canvas.set_dither          (Gdk::RGB_DITHER_NONE);
 161
 162         meter_group = new ArdourCanvas::Group (*time_canvas.root(), 0.0, 0.0);
 163         tempo_group = new ArdourCanvas::Group (*time_canvas.root(), 0.0, timebar_height);
 164         range_marker_group = new ArdourCanvas::Group (*time_canvas.root(), 0.0, timebar_height * 2.0);
 165         transport_marker_group = new ArdourCanvas::Group (*time_canvas.root(), 0.0, timebar_height * 3.0);
 166         marker_group = new ArdourCanvas::Group (*time_canvas.root(), 0.0, timebar_height * 4.0);
 167         cd_marker_group = new ArdourCanvas::Group (*time_canvas.root(), 0.0, timebar_height * 5.0);
 168
 169         tempo_bar = new ArdourCanvas::SimpleRect (*tempo_group, 0.0, 0.0, max_canvas_coordinate, timebar_height-1.0);
 170         tempo_bar->property_outline_pixels() = 0;
 171
 172         meter_bar = new ArdourCanvas::SimpleRect (*meter_group, 0.0, 0.0, max_canvas_coordinate, timebar_height-1.0);
 173         meter_bar->property_outline_pixels() = 0;
 174
 175         marker_bar = new ArdourCanvas::SimpleRect (*marker_group, 0.0, 0.0, max_canvas_coordinate, timebar_height-1.0);
 176         marker_bar->property_outline_pixels() = 0;
 177
 178         cd_marker_bar = new ArdourCanvas::SimpleRect (*cd_marker_group, 0.0, 0.0, max_canvas_coordinate, timebar_height-1.0);
 179         cd_marker_bar->property_outline_pixels() = 0;
 180
 181         range_marker_bar = new ArdourCanvas::SimpleRect (*range_marker_group, 0.0, 0.0, max_canvas_coordinate, timebar_height-1.0);
 182         range_marker_bar->property_outline_pixels() = 0;
 183
 184         transport_marker_bar = new ArdourCanvas::SimpleRect (*transport_marker_group, 0.0, 0.0, max_canvas_coordinate, timebar_height-1.0);
 185         transport_marker_bar->property_outline_pixels() = 0;
 186
 187         range_bar_drag_rect = new ArdourCanvas::SimpleRect (*range_marker_group, 0.0, 0.0, max_canvas_coordinate, timebar_height-1.0);
 188         range_bar_drag_rect->property_outline_pixels() = 0;
 189         range_bar_drag_rect->hide ();
 190
 191         transport_bar_drag_rect = new ArdourCanvas::SimpleRect (*transport_marker_group, 0.0, 0.0, max_canvas_coordinate, timebar_height-1.0);
 192         transport_bar_drag_rect->property_outline_pixels() = 0;
 193         transport_bar_drag_rect->hide ();
 194
 195         marker_drag_line_points.push_back(Gnome::Art::Point(0.0, 0.0));
 196         marker_drag_line_points.push_back(Gnome::Art::Point(0.0, 0.0));
 197
 198         marker_drag_line = new ArdourCanvas::Line (*track_canvas.root());
 199         marker_drag_line->property_width_pixels() = 1;
 200         marker_drag_line->property_points() = marker_drag_line_points;
 201         marker_drag_line->hide();
 202
 203         range_marker_drag_rect = new ArdourCanvas::SimpleRect (*track_canvas.root(), 0.0, 0.0, 0.0, 0.0);
 204         range_marker_drag_rect->hide ();
 205
 206         transport_loop_range_rect = new ArdourCanvas::SimpleRect (*time_line_group, 0.0, 0.0, 0.0, 0.0);
 207         transport_loop_range_rect->property_outline_pixels() = 1;
 208         transport_loop_range_rect->hide();
 209
 210         transport_punch_range_rect = new ArdourCanvas::SimpleRect (*time_line_group, 0.0, 0.0, 0.0, 0.0);
 211         transport_punch_range_rect->property_outline_pixels() = 0;
 212         transport_punch_range_rect->hide();
 213
 214         transport_loop_range_rect->lower_to_bottom (); // loop on the bottom
 215
 216         transport_punchin_line = new ArdourCanvas::SimpleLine (*time_line_group);
 217         transport_punchin_line->property_x1() = 0.0;
 218         transport_punchin_line->property_y1() = 0.0;
 219         transport_punchin_line->property_x2() = 0.0;
 220         transport_punchin_line->property_y2() = 0.0;
 221         transport_punchin_line->hide ();
 222
 223         transport_punchout_line  = new ArdourCanvas::SimpleLine (*time_line_group);
 224         transport_punchout_line->property_x1() = 0.0;
 225         transport_punchout_line->property_y1() = 0.0;
 226         transport_punchout_line->property_x2() = 0.0;
 227         transport_punchout_line->property_y2() = 0.0;
 228         transport_punchout_line->hide();
 229
 230         // used to show zoom mode active zooming
 231         zoom_rect = new ArdourCanvas::SimpleRect (*track_canvas.root(), 0.0, 0.0, 0.0, 0.0);
 232         zoom_rect->property_outline_pixels() = 1;
 233         zoom_rect->hide();
 234
 235         zoom_rect->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_zoom_rect_event), (ArdourCanvas::Item*) 0));
 236
 237         // used as rubberband rect
 238         rubberband_rect = new ArdourCanvas::SimpleRect (*track_canvas.root(), 0.0, 0.0, 0.0, 0.0);
 239         rubberband_rect->property_outline_pixels() = 1;
 240         rubberband_rect->hide();
 241
 242         tempo_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_tempo_bar_event), tempo_bar));
 243         meter_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_meter_bar_event), meter_bar));
 244         marker_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_marker_bar_event), marker_bar));
 245         cd_marker_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_cd_marker_bar_event), cd_marker_bar));
 246         range_marker_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_range_marker_bar_event), range_marker_bar));
 247         transport_marker_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_transport_marker_bar_event), transport_marker_bar));
 248
 249         ZoomChanged.connect (bind (mem_fun(*this, &Editor::update_loop_range_view), false));
 250         ZoomChanged.connect (bind (mem_fun(*this, &Editor::update_punch_range_view), false));
 251
 252         double time_height = timebar_height * 5;
 253         double time_width = FLT_MAX/frames_per_unit;
 254         time_canvas.set_scroll_region(0.0, 0.0, time_width, time_height);
 255
 256         playhead_cursor = new Cursor (*this, &Editor::canvas_playhead_cursor_event);
 257
 258         initial_ruler_update_required = true;
 259         track_canvas.signal_size_allocate().connect (mem_fun(*this, &Editor::track_canvas_allocate));
 260
 261         if (logo_item) {
 262                 logo_item->lower_to_bottom ();
 263         }
 264
 265         ColorsChanged.connect (mem_fun (*this, &Editor::color_handler));
 266         color_handler();
 267
 268 }
 269
 270 void
 271 Editor::track_canvas_allocate (Gtk::Allocation alloc)
 272 {
 273         canvas_allocation = alloc;
 274
 275         if (!initial_ruler_update_required) {
 276                 if (!canvas_idle_queued) {
 277                         /* call this first so that we do stuff before any pending redraw */
 278                         Glib::signal_idle().connect (mem_fun (*this, &Editor::track_canvas_size_allocated), false);
 279                         canvas_idle_queued = true;
 280                 }
 281                 return;
 282         }
 283
 284         initial_ruler_update_required = false;
 285
 286         track_canvas_size_allocated ();
 287 }
 288
 289 bool
 290 Editor::track_canvas_size_allocated ()
 291 {
 292         if (canvas_idle_queued) {
 293                 canvas_idle_queued = false;
 294         }
 295
 296         canvas_width = canvas_allocation.get_width();
 297         canvas_height = canvas_allocation.get_height();
 298
 299         full_canvas_height = canvas_height;
 300
 301         if (session) {
 302                 TrackViewList::iterator i;
 303                 double height = 0;
 304
 305                 for (i = track_views.begin(); i != track_views.end(); ++i) {
 306                         if ((*i)->control_parent) {
 307                                 height += (*i)->effective_height;
 308                         }
 309                 }
 310
 311                 full_canvas_height = height;
 312         }
 313
 314         zoom_range_clock.set ((nframes_t) floor ((canvas_width * frames_per_unit)));
 315         playhead_cursor->set_position (playhead_cursor->current_frame);
 316
 317         reset_hscrollbar_stepping ();
 318         reset_scrolling_region ();
 319
 320         if (playhead_cursor) playhead_cursor->set_length (canvas_height);
 321
 322         for (MarkerSelection::iterator x = selection->markers.begin(); x != selection->markers.end(); ++x) {
 323                 (*x)->set_line_length (canvas_height);
 324         }
 325
 326         range_marker_drag_rect->property_y2() = canvas_height;
 327         transport_loop_range_rect->property_y2() = canvas_height;
 328         transport_punch_range_rect->property_y2() = canvas_height;
 329         transport_punchin_line->property_y2() = canvas_height;
 330         transport_punchout_line->property_y2() = canvas_height;
 331
 332         update_fixed_rulers();
 333         redisplay_tempo (true);
 334
 335         if (logo_item) {
 336                 // logo_item->property_height() = canvas_height;
 337                 // logo_item->property_width() = canvas_width;
 338         }
 339
 340         Resized (); /* EMIT_SIGNAL */
 341
 342         return false;
 343 }
 344
 345 void
 346 Editor::reset_scrolling_region (Gtk::Allocation* alloc)
 347 {
 348         TreeModel::Children rows = route_display_model->children();
 349         TreeModel::Children::iterator i;
 350         double pos;
 351
 352         for (pos = 0, i = rows.begin(); i != rows.end(); ++i) {
 353                 TimeAxisView *tv = (*i)[route_display_columns.tv];
 354                 if (tv != 0 && !tv->hidden()) {
 355                         pos += tv->effective_height;
 356                 }
 357         }
 358
 359         double last_canvas_unit =  last_canvas_frame / frames_per_unit;
 360
 361         track_canvas.set_scroll_region (0.0, 0.0, max (last_canvas_unit, canvas_width), pos);
 362
 363         // XXX what is the correct height value for the time canvas ? this overstates it
 364         time_canvas.set_scroll_region ( 0.0, 0.0, max (last_canvas_unit, canvas_width), canvas_height);
 365
 366         guint track_canvas_width,track_canvas_height;
 367         track_canvas.get_size(track_canvas_width,track_canvas_height);
 368         range_marker_drag_rect->property_y2() = track_canvas_height;
 369         transport_loop_range_rect->property_y2() = track_canvas_height;
 370         transport_punch_range_rect->property_y2() = track_canvas_height;
 371         transport_punchin_line->property_y2() = track_canvas_height;
 372         transport_punchout_line->property_y2() = track_canvas_height;
 373
 374         update_punch_range_view (true);
 375
 376         controls_layout.queue_resize();
 377 }
 378
 379 void
 380 Editor::controls_layout_size_request (Requisition* req)
 381 {
 382         TreeModel::Children rows = route_display_model->children();
 383         TreeModel::Children::iterator i;
 384         double pos;
 385
 386         for (pos = 0, i = rows.begin(); i != rows.end(); ++i) {
 387                 TimeAxisView *tv = (*i)[route_display_columns.tv];
 388                 if (tv != 0) {
 389                         pos += tv->effective_height;
 390                 }
 391         }
 392
 393         RefPtr<Gdk::Screen> screen = get_screen();
 394
 395         if (!screen) {
 396                 screen = Gdk::Screen::get_default();
 397         }
 398
 399         /* never let the width of the controls area shrink horizontally */
 400
 401         edit_controls_vbox.check_resize();
 402
 403         req->width = max (edit_controls_vbox.get_width(),  controls_layout.get_width());
 404
 405         /* don't get too big. the fudge factors here are just guesses */
 406
 407         req->width = min (req->width, screen->get_width() - 300);
 408         req->height = min ((gint) pos, (screen->get_height() - 400));
 409
 410         /* this one is important: it determines how big the layout thinks it really is, as
 411            opposed to what it displays on the screen
 412         */
 413
 414         controls_layout.set_size (req->width, (gint) pos);
 415 }
 416
 417 bool
 418 Editor::track_canvas_map_handler (GdkEventAny* ev)
 419 {
 420         track_canvas.get_window()->set_cursor (*current_canvas_cursor);
 421         return false;
 422 }
 423
 424 bool
 425 Editor::time_canvas_map_handler (GdkEventAny* ev)
 426 {
 427         time_canvas.get_window()->set_cursor (*timebar_cursor);
 428         return false;
 429 }
 430
 431 void
 432 Editor::track_canvas_drag_data_received (const RefPtr<Gdk::DragContext>& context,
 433                                          int x, int y,
 434                                          const SelectionData& data,
 435                                          guint info, guint time)
 436 {
 437         if (data.get_target() == "regions") {
 438                 drop_regions (context, x, y, data, info, time);
 439         } else {
 440                 drop_paths (context, x, y, data, info, time);
 441         }
 442 }
 443
 444 void
 445 Editor::drop_paths (const RefPtr<Gdk::DragContext>& context,
 446                     int x, int y,
 447                     const SelectionData& data,
 448                     guint info, guint time)
 449 {
 450         TimeAxisView* tvp;
 451         AudioTimeAxisView* tv;
 452         double cy;
 453         vector<ustring> paths;
 454         string spath;
 455         GdkEvent ev;
 456         nframes64_t frame;
 457
 458         if (convert_drop_to_paths (paths, context, x, y, data, info, time)) {
 459                 goto out;
 460         }
 461
 462         /* D-n-D coordinates are window-relative, so convert to "world" coordinates
 463          */
 464
 465         double wx;
 466         double wy;
 467
 468         track_canvas.window_to_world (x, y, wx, wy);
 469         wx += horizontal_adjustment.get_value();
 470         wy += vertical_adjustment.get_value();
 471
 472         ev.type = GDK_BUTTON_RELEASE;
 473         ev.button.x = wx;
 474         ev.button.y = wy;
 475
 476         frame = event_frame (&ev, 0, &cy);
 477
 478         snap_to (frame);
 479
 480         if ((tvp = trackview_by_y_position (cy)) == 0) {
 481
 482                 /* drop onto canvas background: create new tracks */
 483
 484                 frame = 0;
 485
 486                 do_embed (paths, Editing::ImportDistinctFiles, ImportAsTrack, frame);
 487
 488         } else if ((tv = dynamic_cast<AudioTimeAxisView*>(tvp)) != 0) {
 489
 490                 /* check that its an audio track, not a bus */
 491
 492                 if (tv->get_diskstream()) {
 493                         /* select the track, then embed */
 494                         selection->set (tv);
 495                         do_embed (paths, Editing::ImportDistinctFiles, ImportToTrack, frame);
 496                 }
 497         }
 498
 499   out:
 500         context->drag_finish (true, false, time);
 501 }
 502
 503 void
 504 Editor::drop_regions (const RefPtr<Gdk::DragContext>& context,
 505                       int x, int y,
 506                       const SelectionData& data,
 507                       guint info, guint time)
 508 {
 509         const SerializedObjectPointers<boost::shared_ptr<Region> >* sr =
 510                 reinterpret_cast<const SerializedObjectPointers<boost::shared_ptr<Region> > *> (data.get_data());
 511
 512         for (uint32_t i = 0; i < sr->cnt; ++i) {
 513
 514                 boost::shared_ptr<Region> r = sr->data[i];
 515                 boost::shared_ptr<AudioRegion> ar;
 516
 517                 if ((ar = boost::dynamic_pointer_cast<AudioRegion>(r)) != 0) {
 518                         insert_region_list_drag (ar, x, y);
 519                 }
 520         }
 521
 522         context->drag_finish (true, false, time);
 523 }
 524
 525 void
 526 Editor::maybe_autoscroll (GdkEvent* event)
 527 {
 528         nframes_t rightmost_frame = leftmost_frame + current_page_frames();
 529         nframes_t frame = drag_info.current_pointer_frame;
 530         bool startit = false;
 531
 532         static int last_autoscroll_direction = 0;
 533
 534         if (frame > rightmost_frame) {
 535
 536                 if (rightmost_frame < max_frames) {
 537                         autoscroll_direction = 1;
 538                         startit = true;
 539                 }
 540
 541         } else if (frame < leftmost_frame) {
 542
 543                 if (leftmost_frame > 0) {
 544                         autoscroll_direction = -1;
 545                         startit = true;
 546                 }
 547
 548         } else {
 549
 550                 if (drag_info.last_pointer_frame > drag_info.current_pointer_frame) {
 551                         autoscroll_direction = -1;
 552                 } else {
 553                         autoscroll_direction = 1;
 554                 }
 555         }
 556
 557
 558         if ((autoscroll_direction != last_autoscroll_direction) || (leftmost_frame < frame < rightmost_frame)) {
 559                 stop_canvas_autoscroll ();
 560         }
 561
 562         if (startit && autoscroll_timeout_tag < 0) {
 563                 start_canvas_autoscroll (autoscroll_direction);
 564         }
 565
 566         last_autoscroll_direction = autoscroll_direction;
 567 }
 568
 569 gint
 570 Editor::_autoscroll_canvas (void *arg)
 571 {
 572         return ((Editor *) arg)->autoscroll_canvas ();
 573 }
 574
 575 bool
 576 Editor::autoscroll_canvas ()
 577 {
 578         nframes_t new_frame;
 579         nframes_t limit = max_frames - current_page_frames();
 580         GdkEventMotion ev;
 581         nframes_t target_frame;
 582
 583         if (autoscroll_direction < 0) {
 584                 if (leftmost_frame < autoscroll_distance) {
 585                         new_frame = 0;
 586                 } else {
 587                         new_frame = leftmost_frame - autoscroll_distance;
 588                 }
 589                 target_frame = drag_info.current_pointer_frame - autoscroll_distance;
 590         } else {
 591                 if (leftmost_frame > limit - autoscroll_distance) {
 592                         new_frame = limit;
 593                 } else {
 594                         new_frame = leftmost_frame + autoscroll_distance;
 595                 }
 596                 target_frame = drag_info.current_pointer_frame + autoscroll_distance;
 597         }
 598
 599         /* now fake a motion event to get the object that is being dragged to move too */
 600
 601         ev.type = GDK_MOTION_NOTIFY;
 602         ev.state &= Gdk::BUTTON1_MASK;
 603         ev.x = frame_to_unit (target_frame);
 604         ev.y = drag_info.current_pointer_y;
 605         motion_handler (drag_info.item, (GdkEvent*) &ev, drag_info.item_type, true);
 606
 607         if (new_frame == 0 || new_frame == limit) {
 608                 /* we are done */
 609                 return false;
 610         }
 611
 612         autoscroll_cnt++;
 613
 614         if (autoscroll_cnt == 1) {
 615
 616                 /* connect the timeout so that we get called repeatedly */
 617
 618                 autoscroll_timeout_tag = g_idle_add ( _autoscroll_canvas, this);
 619                 return false;
 620
 621         }
 622
 623         if (new_frame != leftmost_frame) {
 624                 reset_x_origin (new_frame);
 625         }
 626
 627         if (autoscroll_cnt == 50) { /* 0.5 seconds */
 628
 629                 /* after about a while, speed up a bit by changing the timeout interval */
 630
 631                 autoscroll_distance = (nframes_t) floor (current_page_frames()/30.0f);
 632
 633         } else if (autoscroll_cnt == 150) { /* 1.0 seconds */
 634
 635                 autoscroll_distance = (nframes_t) floor (current_page_frames()/20.0f);
 636
 637         } else if (autoscroll_cnt == 300) { /* 1.5 seconds */
 638
 639                 /* after about another while, speed up by increasing the shift per callback */
 640
 641                 autoscroll_distance =  (nframes_t) floor (current_page_frames()/10.0f);
 642
 643         }
 644
 645         return true;
 646 }
 647
 648 void
 649 Editor::start_canvas_autoscroll (int dir)
 650 {
 651         if (!session || autoscroll_active) {
 652                 return;
 653         }
 654
 655         stop_canvas_autoscroll ();
 656
 657         autoscroll_active = true;
 658         autoscroll_direction = dir;
 659         autoscroll_distance = (nframes_t) floor (current_page_frames()/50.0);
 660         autoscroll_cnt = 0;
 661
 662         /* do it right now, which will start the repeated callbacks */
 663
 664         autoscroll_canvas ();
 665 }
 666
 667 void
 668 Editor::stop_canvas_autoscroll ()
 669 {
 670         if (autoscroll_timeout_tag >= 0) {
 671                 g_source_remove (autoscroll_timeout_tag);
 672                 autoscroll_timeout_tag = -1;
 673         }
 674
 675         autoscroll_active = false;
 676 }
 677
 678 gint
 679 Editor::left_track_canvas (GdkEventCrossing *ev)
 680 {
 681         set_entered_track (0);
 682         set_entered_regionview (0);
 683         return FALSE;
 684 }
 685
 686
 687 void
 688 Editor::canvas_horizontally_scrolled ()
 689 {
 690         /* this is the core function that controls horizontal scrolling of the canvas. it is called
 691            whenever the horizontal_adjustment emits its "value_changed" signal. it typically executes in an
 692            idle handler, which is important because tempo_map_changed() should issue redraws immediately
 693            and not defer them to an idle handler.
 694         */
 695
 696         leftmost_frame = (nframes_t) floor (horizontal_adjustment.get_value() * frames_per_unit);
 697         nframes_t rightmost_frame = leftmost_frame + current_page_frames ();
 698
 699         if (rightmost_frame > last_canvas_frame) {
 700                 last_canvas_frame = rightmost_frame;
 701                 reset_scrolling_region ();
 702         }
 703
 704         if (logo_item) {
 705                 logo_item->property_x() = horizontal_adjustment.get_value ();
 706         }
 707
 708         update_fixed_rulers ();
 709
 710         redisplay_tempo (!_dragging_hscrollbar);
 711 }
 712
 713 void
 714 Editor::color_handler()
 715 {
 716         playhead_cursor->canvas_item.property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_PlayHead.get();
 717         verbose_canvas_cursor->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_VerboseCanvasCursor.get();
 718
 719         meter_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MeterBar.get();
 720         meter_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
 721
 722         tempo_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TempoBar.get();
 723         tempo_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
 724
 725         marker_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBar.get();
 726         marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
 727
 728         cd_marker_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_CDMarkerBar.get();
 729         cd_marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
 730
 731         range_marker_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeMarkerBar.get();
 732         range_marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
 733
 734         transport_marker_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportMarkerBar.get();
 735         transport_marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();
 736
 737         range_bar_drag_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragBarRect.get();
 738         range_bar_drag_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragBarRect.get();
 739
 740         transport_bar_drag_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportDragRect.get();
 741         transport_bar_drag_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportDragRect.get();
 742
 743         marker_drag_line->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerDragLine.get();
 744
 745         range_marker_drag_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragRect.get();
 746         range_marker_drag_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragRect.get();
 747
 748         transport_loop_range_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportLoopRect.get();
 749         transport_loop_range_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportLoopRect.get();
 750
 751         transport_punch_range_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportPunchRect.get();
 752         transport_punch_range_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportPunchRect.get();
 753
 754         transport_punchin_line->property_color_rgba() = ARDOUR_UI::config()->canvasvar_PunchLine.get();
 755         transport_punchout_line->property_color_rgba() = ARDOUR_UI::config()->canvasvar_PunchLine.get();
 756
 757         zoom_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_ZoomRect.get();
 758         zoom_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_ZoomRect.get();
 759
 760         rubberband_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RubberBandRect.get();
 761         rubberband_rect->property_fill_color_rgba() = (guint32) ARDOUR_UI::config()->canvasvar_RubberBandRect.get();
 762
 763         location_marker_color = ARDOUR_UI::config()->canvasvar_LocationMarker.get();
 764         location_range_color = ARDOUR_UI::config()->canvasvar_LocationRange.get();
 765         location_cd_marker_color = ARDOUR_UI::config()->canvasvar_LocationCDMarker.get();
 766         location_loop_color = ARDOUR_UI::config()->canvasvar_LocationLoop.get();
 767         location_punch_color = ARDOUR_UI::config()->canvasvar_LocationPunch.get();
 768
 769         refresh_location_display ();
 770         redisplay_tempo (true);
 771
 772         if (session)
 773                 session->tempo_map().apply_with_metrics (*this, &Editor::draw_metric_marks); // redraw metric markers
 774 }
 775
 776 void
 777 Editor::flush_canvas ()
 778 {
 779         if (is_mapped()) {
 780                 track_canvas.update_now ();
 781                 // gdk_window_process_updates (GTK_LAYOUT(track_canvas.gobj())->bin_window, true);
 782         }
 783 }
 784