gtk2_ardour/panner2d.cc

   1 /*
   2     Copyright (C) 2002 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 <cmath>
  21 #include <climits>
  22 #include <string.h>
  23
  24 #include <gtkmm/menu.h>
  25 #include <gtkmm/checkmenuitem.h>
  26
  27 #include <pbd/error.h>
  28 #include <ardour/panner.h>
  29 #include <gtkmm2ext/gtk_ui.h>
  30
  31 #include "panner2d.h"
  32 #include "keyboard.h"
  33 #include "gui_thread.h"
  34
  35 #include "i18n.h"
  36
  37 using namespace std;
  38 using namespace Gtk;
  39 using namespace sigc;
  40 using namespace ARDOUR;
  41 using namespace PBD;
  42
  43 Panner2d::Target::Target (float xa, float ya, const char *txt)
  44         : x (xa), y (ya), text (txt ? strdup (txt) : 0)
  45 {
  46         if (text) {
  47                 textlen = strlen (txt);
  48         } else {
  49                 textlen = 0;
  50         }
  51 }
  52
  53 Panner2d::Target::~Target ()
  54 {
  55         if (text) {
  56                 free (text);
  57         }
  58 }
  59
  60 Panner2d::Panner2d (Panner& p, int32_t h)
  61         : panner (p), width (0), height (h)
  62 {
  63         context_menu = 0;
  64         bypass_menu_item = 0;
  65
  66         allow_x = false;
  67         allow_y = false;
  68         allow_target = false;
  69
  70         panner.StateChanged.connect (mem_fun(*this, &Panner2d::handle_state_change));
  71
  72         drag_target = 0;
  73         set_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK);
  74
  75 }
  76
  77 Panner2d::~Panner2d()
  78 {
  79         for (Targets::iterator i = targets.begin(); i != targets.end(); ++i) {
  80                 delete i->second;
  81         }
  82 }
  83
  84 void
  85 Panner2d::reset (uint32_t n_inputs)
  86 {
  87         /* add pucks */
  88
  89         drop_pucks ();
  90
  91         switch (n_inputs) {
  92         case 0:
  93                 break;
  94
  95         case 1:
  96                 add_puck ("", 0.0f, 0.5f);
  97                 break;
  98
  99         case 2:
 100                 add_puck ("L", 0.5f, 0.25f);
 101                 add_puck ("R", 0.25f, 0.5f);
 102                 show_puck (0);
 103                 show_puck (1);
 104                 break;
 105
 106         default:
 107                 for (uint32_t i = 0; i < n_inputs; ++i) {
 108                         char buf[64];
 109                         snprintf (buf, sizeof (buf), "%" PRIu32, i);
 110                         add_puck (buf, 0.0f, 0.5f);
 111                         show_puck (i);
 112                 }
 113                 break;
 114         }
 115
 116         /* add all outputs */
 117
 118         drop_targets ();
 119
 120         for (uint32_t n = 0; n < panner.nouts(); ++n) {
 121                 add_target (panner.output (n).x, panner.output (n).y);
 122         }
 123
 124         allow_x_motion (true);
 125         allow_y_motion (true);
 126         allow_target_motion (true);
 127 }
 128
 129 void
 130 Panner2d::on_size_allocate (Gtk::Allocation& alloc)
 131 {
 132         width = alloc.get_width();
 133         height = alloc.get_height();
 134
 135         DrawingArea::on_size_allocate (alloc);
 136 }
 137
 138 int
 139 Panner2d::add_puck (const char* text, float x, float y)
 140 {
 141         Target* puck = new Target (x, y, text);
 142
 143         pair<int,Target *> newpair;
 144         newpair.first = pucks.size();
 145         newpair.second = puck;
 146
 147         pucks.insert (newpair);
 148         puck->visible = true;
 149
 150         return 0;
 151 }
 152
 153 int
 154 Panner2d::add_target (float x, float y)
 155 {
 156         Target *target = new Target (x, y, "");
 157
 158         pair<int,Target *> newpair;
 159         newpair.first = targets.size();
 160         newpair.second = target;
 161
 162         targets.insert (newpair);
 163         target->visible = true;
 164         queue_draw ();
 165
 166         return newpair.first;
 167 }
 168
 169 void
 170 Panner2d::drop_targets ()
 171 {
 172         for (Targets::iterator i = targets.begin(); i != targets.end(); ) {
 173
 174                 Targets::iterator tmp;
 175
 176                 tmp = i;
 177                 ++tmp;
 178
 179                 delete i->second;
 180                 targets.erase (i);
 181
 182                 i = tmp;
 183         }
 184
 185         queue_draw ();
 186 }
 187
 188 void
 189 Panner2d::drop_pucks ()
 190 {
 191         for (Targets::iterator i = pucks.begin(); i != pucks.end(); ) {
 192
 193                 Targets::iterator tmp;
 194
 195                 tmp = i;
 196                 ++tmp;
 197
 198                 delete i->second;
 199                 pucks.erase (i);
 200
 201                 i = tmp;
 202         }
 203
 204         queue_draw ();
 205 }
 206
 207 void
 208 Panner2d::remove_target (int which)
 209 {
 210         Targets::iterator i = targets.find (which);
 211
 212         if (i != targets.end()) {
 213                 delete i->second;
 214                 targets.erase (i);
 215                 queue_draw ();
 216         }
 217 }
 218
 219 void
 220 Panner2d::handle_state_change ()
 221 {
 222         ENSURE_GUI_THREAD(mem_fun(*this, &Panner2d::handle_state_change));
 223
 224         queue_draw ();
 225 }
 226
 227 void
 228 Panner2d::move_target (int which, float x, float y)
 229 {
 230         Targets::iterator i = targets.find (which);
 231         Target *target;
 232
 233         if (!allow_target) {
 234                 return;
 235         }
 236
 237         if (i != targets.end()) {
 238                 target = i->second;
 239                 target->x = x;
 240                 target->y = y;
 241
 242                 queue_draw ();
 243         }
 244 }
 245
 246 void
 247 Panner2d::move_puck (int which, float x, float y)
 248 {
 249         Targets::iterator i = pucks.find (which);
 250         Target *target;
 251
 252         if (i != pucks.end()) {
 253                 target = i->second;
 254                 target->x = x;
 255                 target->y = y;
 256
 257                 queue_draw ();
 258         }
 259 }
 260
 261 void
 262 Panner2d::show_puck (int which)
 263 {
 264         Targets::iterator i = pucks.find (which);
 265
 266         if (i != pucks.end()) {
 267                 Target* puck = i->second;
 268                 if (!puck->visible) {
 269                         puck->visible = true;
 270                         queue_draw ();
 271                 }
 272         }
 273 }
 274
 275 void
 276 Panner2d::hide_puck (int which)
 277 {
 278         Targets::iterator i = pucks.find (which);
 279
 280         if (i != pucks.end()) {
 281                 Target* puck = i->second;
 282                 if (!puck->visible) {
 283                         puck->visible = false;
 284                         queue_draw ();
 285                 }
 286         }
 287 }
 288
 289 void
 290 Panner2d::show_target (int which)
 291 {
 292         Targets::iterator i = targets.find (which);
 293         if (i != targets.end()) {
 294                 if (!i->second->visible) {
 295                         i->second->visible = true;
 296                         queue_draw ();
 297                 }
 298         }
 299 }
 300
 301 void
 302 Panner2d::hide_target (int which)
 303 {
 304         Targets::iterator i = targets.find (which);
 305         if (i != targets.end()) {
 306                 if (i->second->visible) {
 307                         i->second->visible = false;
 308                         queue_draw ();
 309                 }
 310         }
 311 }
 312
 313 Panner2d::Target *
 314 Panner2d::find_closest_object (gdouble x, gdouble y, int& which, bool& is_puck) const
 315 {
 316         gdouble efx, efy;
 317         Target *closest = 0;
 318         Target *candidate;
 319         float distance;
 320         float best_distance = FLT_MAX;
 321         int pwhich;
 322
 323         efx = x/width;
 324         efy = y/height;
 325         which = 0;
 326         pwhich = 0;
 327         is_puck = false;
 328
 329         for (Targets::const_iterator i = targets.begin(); i != targets.end(); ++i, ++which) {
 330                 candidate = i->second;
 331
 332                 distance = sqrt ((candidate->x - efx) * (candidate->x - efx) +
 333                                  (candidate->y - efy) * (candidate->y - efy));
 334
 335                 if (distance < best_distance) {
 336                         closest = candidate;
 337                         best_distance = distance;
 338                 }
 339         }
 340
 341         for (Targets::const_iterator i = pucks.begin(); i != pucks.end(); ++i, ++pwhich) {
 342                 candidate = i->second;
 343
 344                 distance = sqrt ((candidate->x - efx) * (candidate->x - efx) +
 345                                  (candidate->y - efy) * (candidate->y - efy));
 346
 347                 if (distance < best_distance) {
 348                         closest = candidate;
 349                         best_distance = distance;
 350                         is_puck = true;
 351                         which = pwhich;
 352                 }
 353         }
 354
 355         return closest;
 356 }
 357
 358 bool
 359 Panner2d::on_motion_notify_event (GdkEventMotion *ev)
 360 {
 361         gint x, y;
 362         GdkModifierType state;
 363
 364         if (ev->is_hint) {
 365                 gdk_window_get_pointer (ev->window, &x, &y, &state);
 366         } else {
 367                 x = (int) floor (ev->x);
 368                 y = (int) floor (ev->y);
 369                 state = (GdkModifierType) ev->state;
 370         }
 371         return handle_motion (x, y, state);
 372 }
 373 gint
 374 Panner2d::handle_motion (gint evx, gint evy, GdkModifierType state)
 375 {
 376         if (drag_target == 0 || (state & GDK_BUTTON1_MASK) == 0) {
 377                 return FALSE;
 378         }
 379
 380         int x, y;
 381         bool need_move = false;
 382
 383         if (!drag_is_puck && !allow_target) {
 384                 return TRUE;
 385         }
 386
 387         if (allow_x || !drag_is_puck) {
 388                 float new_x;
 389                 x = min (evx, width - 1);
 390                 x = max (x, 0);
 391                 new_x = (float) x / (width - 1);
 392                 if (new_x != drag_target->x) {
 393                         drag_target->x = new_x;
 394                         need_move = true;
 395                 }
 396         }
 397
 398         if (allow_y || drag_is_puck) {
 399                 float new_y;
 400                 y = min (evy, height - 1);
 401                 y = max (y, 0);
 402                 new_y = (float) y / (height - 1);
 403                 if (new_y != drag_target->y) {
 404                         drag_target->y = new_y;
 405                         need_move = true;
 406                 }
 407         }
 408
 409         if (need_move) {
 410                 queue_draw ();
 411
 412                 if (drag_is_puck) {
 413
 414                         panner[drag_index]->set_position (drag_target->x, drag_target->y);
 415
 416                 } else {
 417
 418                         TargetMoved (drag_index);
 419                 }
 420         }
 421
 422         return TRUE;
 423 }
 424
 425 bool
 426 Panner2d::on_expose_event (GdkEventExpose *event)
 427 {
 428         gint x, y;
 429         float fx, fy;
 430
 431         if (layout == 0) {
 432                 layout = create_pango_layout ("");
 433                 layout->set_font_description (get_style()->get_font());
 434         }
 435
 436         /* redraw the background */
 437
 438         get_window()->draw_rectangle (get_style()->get_bg_gc(get_state()),
 439                                      true,
 440                                      event->area.x, event->area.y,
 441                                      event->area.width, event->area.height);
 442
 443
 444         if (!panner.bypassed()) {
 445
 446                 for (Targets::iterator i = pucks.begin(); i != pucks.end(); ++i) {
 447
 448                         Target* puck = i->second;
 449
 450                         if (puck->visible) {
 451                                 /* redraw puck */
 452
 453                                 fx = min (puck->x, 1.0f);
 454                                 fx = max (fx, -1.0f);
 455                                 x = (gint) floor (width * fx - 4);
 456
 457                                 fy = min (puck->y, 1.0f);
 458                                 fy = max (fy, -1.0f);
 459                                 y = (gint) floor (height * fy - 4);
 460
 461                                 get_window()->draw_arc (get_style()->get_fg_gc(Gtk::STATE_NORMAL),
 462                                                        true,
 463                                                        x, y,
 464                                                        8, 8,
 465                                                        0, 360 * 64);
 466
 467                                 layout->set_text (puck->text);
 468
 469                                 get_window()->draw_layout (get_style()->get_fg_gc (STATE_NORMAL), x+6, y+6, layout);
 470                         }
 471                 }
 472
 473                 /* redraw any visible targets */
 474
 475                 for (Targets::iterator i = targets.begin(); i != targets.end(); ++i) {
 476                         Target *target = i->second;
 477
 478                         if (target->visible) {
 479
 480                                 /* why -8 ??? why is this necessary ? */
 481
 482                                 fx = min (target->x, 1.0f);
 483                                 fx = max (fx, -1.0f);
 484                                 x = (gint) floor ((width - 8) * fx);
 485
 486                                 fy = min (target->y, 1.0f);
 487                                 fy = max (fy, -1.0f);
 488                                 y = (gint) floor ((height - 8) * fy);
 489
 490                                 get_window()->draw_rectangle (get_style()->get_fg_gc(Gtk::STATE_ACTIVE),
 491                                                              true,
 492                                                              x, y,
 493                                                              4, 4);
 494                         }
 495                 }
 496         }
 497
 498         return TRUE;
 499 }
 500
 501 bool
 502 Panner2d::on_button_press_event (GdkEventButton *ev)
 503 {
 504         switch (ev->button) {
 505         case 1:
 506                 gint x, y;
 507                 GdkModifierType state;
 508
 509                 drag_target = find_closest_object (ev->x, ev->y, drag_index, drag_is_puck);
 510
 511                 x = (int) floor (ev->x);
 512                 y = (int) floor (ev->y);
 513                 state = (GdkModifierType) ev->state;
 514
 515                 return handle_motion (x, y, state);
 516                 break;
 517         default:
 518                 break;
 519         }
 520
 521         return FALSE;
 522 }
 523
 524 bool
 525 Panner2d::on_button_release_event (GdkEventButton *ev)
 526 {
 527         switch (ev->button) {
 528         case 1:
 529                 gint x, y;
 530                 int ret;
 531                 GdkModifierType state;
 532
 533                 x = (int) floor (ev->x);
 534                 y = (int) floor (ev->y);
 535                 state = (GdkModifierType) ev->state;
 536
 537                 if (drag_is_puck && (Keyboard::modifier_state_contains (state, Keyboard::Shift))) {
 538
 539                         for (Targets::iterator i = pucks.begin(); i != pucks.end(); ++i) {
 540                                 Target* puck = i->second;
 541                                 puck->x = 0.5;
 542                                 puck->y = 0.5;
 543                         }
 544
 545                         queue_draw ();
 546                         PuckMoved (-1);
 547                         ret = TRUE;
 548
 549                 } else {
 550                         ret = handle_motion (x, y, state);
 551                 }
 552
 553                 drag_target = 0;
 554
 555                 return ret;
 556                 break;
 557         case 2:
 558                 toggle_bypass ();
 559                 return TRUE;
 560
 561         case 3:
 562                 show_context_menu ();
 563                 break;
 564
 565         }
 566
 567         return FALSE;
 568 }
 569
 570 void
 571 Panner2d::toggle_bypass ()
 572 {
 573         if (bypass_menu_item && (panner.bypassed() != bypass_menu_item->get_active())) {
 574                 panner.set_bypassed (!panner.bypassed());
 575         }
 576 }
 577
 578 void
 579 Panner2d::show_context_menu ()
 580 {
 581         using namespace Menu_Helpers;
 582
 583         if (context_menu == 0) {
 584                 context_menu = manage (new Menu);
 585                 context_menu->set_name ("ArdourContextMenu");
 586                 MenuList& items = context_menu->items();
 587
 588                 items.push_back (CheckMenuElem (_("Bypass")));
 589                 bypass_menu_item = static_cast<CheckMenuItem*> (&items.back());
 590                 bypass_menu_item->signal_toggled().connect (mem_fun(*this, &Panner2d::toggle_bypass));
 591
 592         }
 593
 594         bypass_menu_item->set_active (panner.bypassed());
 595         context_menu->popup (1, gtk_get_current_event_time());
 596 }
 597
 598 void
 599 Panner2d::allow_x_motion (bool yn)
 600 {
 601         allow_x = yn;
 602 }
 603
 604 void
 605 Panner2d::allow_target_motion (bool yn)
 606 {
 607         allow_target = yn;
 608 }
 609
 610 void
 611 Panner2d::allow_y_motion (bool yn)
 612 {
 613         allow_y = yn;
 614 }
 615
 616 int
 617 Panner2d::puck_position (int which, float& x, float& y)
 618 {
 619         Targets::iterator i;
 620
 621         if ((i = pucks.find (which)) != pucks.end()) {
 622                 x = i->second->x;
 623                 y = i->second->y;
 624                 return 0;
 625         }
 626
 627         return -1;
 628 }
 629
 630 int
 631 Panner2d::target_position (int which, float& x, float& y)
 632 {
 633         Targets::iterator i;
 634
 635         if ((i = targets.find (which)) != targets.end()) {
 636                 x = i->second->x;
 637                 y = i->second->y;
 638                 return 0;
 639         }
 640
 641         return -1;
 642 }
 643