gtk2_ardour/gtk_pianokeyboard.c

   1 /*-
   2  * Copyright (c) 2007, 2008 Edward Tomasz Napiera�Å‚a <trasz@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 /*
  28  * This is piano_keyboard, piano keyboard-like GTK+ widget.  It contains
  29  * no MIDI-specific code.
  30  *
  31  * For questions and comments, contact Edward Tomasz Napierala <trasz@FreeBSD.org>.
  32  */
  33
  34 #include <assert.h>
  35 #include <string.h>
  36 #include <strings.h>
  37 #include <stdint.h>
  38 #include <cairo/cairo.h>
  39 #include <gtk/gtk.h>
  40 #include <gdk/gdkkeysyms.h>
  41
  42 #include "gtk_pianokeyboard.h"
  43
  44 #define PIANO_KEYBOARD_DEFAULT_WIDTH 730
  45 #define PIANO_KEYBOARD_DEFAULT_HEIGHT 70
  46
  47 enum {
  48         NOTE_ON_SIGNAL,
  49         NOTE_OFF_SIGNAL,
  50         REST_SIGNAL,
  51         LAST_SIGNAL
  52 };
  53
  54 static guint    piano_keyboard_signals[LAST_SIGNAL] = { 0 };
  55
  56 static void
  57 draw_keyboard_cue(PianoKeyboard *pk, cairo_t* cr)
  58 {
  59         int             w = pk->notes[0].w;
  60         int             h = pk->notes[0].h;
  61
  62         int             first_note_in_lower_row = (pk->octave + 5) * 12;
  63         int             last_note_in_lower_row = (pk->octave + 6) * 12 - 1;
  64         int             first_note_in_higher_row = (pk->octave + 6) * 12;
  65         int             last_note_in_higher_row = (pk->octave + 7) * 12 + 4;
  66
  67         cairo_set_source_rgb (cr, 1.0f, 0.0f, 0.0f);
  68         cairo_move_to (cr, pk->notes[first_note_in_lower_row].x + 3, h - 6);
  69         cairo_line_to (cr, pk->notes[last_note_in_lower_row].x + w - 3, h - 6);
  70         cairo_stroke (cr);
  71
  72         cairo_set_source_rgb (cr, 0.0f, 0.0f, 1.0f);
  73         cairo_move_to (cr, pk->notes[first_note_in_higher_row].x + 3, h - 9);
  74         cairo_line_to (cr, pk->notes[last_note_in_higher_row].x + w - 3, h - 9);
  75         cairo_stroke (cr);
  76 }
  77
  78 static void
  79 queue_note_draw (PianoKeyboard* pk, int note)
  80 {
  81         GdkWindow* w = GTK_WIDGET(pk)->window;
  82
  83         if (w) {
  84                 GdkRectangle r;
  85
  86                 r.x = pk->notes[note].x;
  87                 r.y = 0;
  88                 r.width = pk->notes[note].w;
  89                 r.height = pk->notes[note].h;
  90
  91                 gdk_window_invalidate_rect (w, &r, TRUE);
  92         }
  93 }
  94
  95 static void
  96 draw_note(PianoKeyboard *pk, cairo_t* cr, int note)
  97 {
  98         int             is_white = pk->notes[note].white;
  99
 100         int             x = pk->notes[note].x;
 101         int             w = pk->notes[note].w;
 102         int             h = pk->notes[note].h;
 103
 104         if (pk->notes[note].pressed || pk->notes[note].sustained) {
 105                 if (is_white) {
 106                         cairo_set_source_rgb (cr, 0.60f, 0.60f, 0.60f);
 107                 } else {
 108                         cairo_set_source_rgb (cr, 0.50f, 0.50f, 0.50f);
 109                 }
 110         } else {
 111                 if (is_white) {
 112                         cairo_set_source_rgb (cr, 1.0f, 1.0f, 1.0f);
 113                 } else {
 114                         cairo_set_source_rgb (cr, 0.0f, 0.0f, 0.0f);
 115                 }
 116         }
 117
 118         cairo_set_line_width (cr, 1.0);
 119
 120         cairo_rectangle (cr, x, 0, w, h);
 121         cairo_fill (cr);
 122
 123         cairo_set_source_rgb(cr, 0.0f, 0.0f, 0.0f); /* black outline */
 124         cairo_rectangle (cr, x, 0, w, h);
 125         cairo_stroke (cr);
 126
 127         if (pk->enable_keyboard_cue) {
 128                 draw_keyboard_cue (pk, cr);
 129         }
 130
 131         /* We need to redraw black keys that partially obscure the white one. */
 132         if (note < NNOTES - 2 && !pk->notes[note + 1].white) {
 133                 draw_note(pk, cr, note + 1);
 134         }
 135
 136         if (note > 0 && !pk->notes[note - 1].white) {
 137                 draw_note(pk, cr, note - 1);
 138         }
 139 }
 140
 141 static int
 142 press_key(PianoKeyboard *pk, int key)
 143 {
 144         assert(key >= 0);
 145         assert(key < NNOTES);
 146
 147         pk->maybe_stop_sustained_notes = 0;
 148
 149         /* This is for keyboard autorepeat protection. */
 150         if (pk->notes[key].pressed)
 151                 return 0;
 152
 153         if (pk->sustain_new_notes)
 154                 pk->notes[key].sustained = 1;
 155         else
 156                 pk->notes[key].sustained = 0;
 157
 158         pk->notes[key].pressed = 1;
 159
 160         g_signal_emit_by_name(GTK_WIDGET(pk), "note-on", key);
 161         queue_note_draw(pk, key);
 162
 163         return 1;
 164 }
 165
 166 static int
 167 release_key(PianoKeyboard *pk, int key)
 168 {
 169         assert(key >= 0);
 170         assert(key < NNOTES);
 171
 172         pk->maybe_stop_sustained_notes = 0;
 173
 174         if (!pk->notes[key].pressed)
 175                 return 0;
 176
 177         if (pk->sustain_new_notes)
 178                 pk->notes[key].sustained = 1;
 179
 180         pk->notes[key].pressed = 0;
 181
 182         if (pk->notes[key].sustained)
 183                 return 0;
 184
 185         g_signal_emit_by_name(GTK_WIDGET(pk), "note-off", key);
 186         queue_note_draw(pk, key);
 187
 188         return 1;
 189 }
 190
 191 static void
 192 rest (PianoKeyboard* pk)
 193 {
 194         g_signal_emit_by_name(GTK_WIDGET(pk), "rest");
 195 }
 196
 197 static void
 198 stop_unsustained_notes(PianoKeyboard *pk)
 199 {
 200         int             i;
 201
 202         for (i = 0; i < NNOTES; i++) {
 203                 if (pk->notes[i].pressed && !pk->notes[i].sustained) {
 204                         pk->notes[i].pressed = 0;
 205                         g_signal_emit_by_name(GTK_WIDGET(pk), "note-off", i);
 206                         queue_note_draw(pk, i);
 207                 }
 208         }
 209 }
 210
 211 static void
 212 stop_sustained_notes(PianoKeyboard *pk)
 213 {
 214         int             i;
 215
 216         for (i = 0; i < NNOTES; i++) {
 217                 if (pk->notes[i].sustained) {
 218                         pk->notes[i].pressed = 0;
 219                         pk->notes[i].sustained = 0;
 220                         g_signal_emit_by_name(GTK_WIDGET(pk), "note-off", i);
 221                         queue_note_draw(pk, i);
 222                 }
 223         }
 224 }
 225
 226 static int
 227 key_binding(PianoKeyboard *pk, const char *key)
 228 {
 229         gpointer notused, note;
 230         gboolean found;
 231
 232         assert(pk->key_bindings != NULL);
 233
 234         found = g_hash_table_lookup_extended(pk->key_bindings, key, &notused, &note);
 235
 236         if (!found)
 237                 return -1;
 238
 239         return (intptr_t)note;
 240 }
 241
 242 static void
 243 bind_key(PianoKeyboard *pk, const char *key, int note)
 244 {
 245         assert(pk->key_bindings != NULL);
 246
 247         g_hash_table_insert(pk->key_bindings, (gpointer)key, (gpointer)((intptr_t)note));
 248 }
 249
 250 static void
 251 clear_notes(PianoKeyboard *pk)
 252 {
 253         assert(pk->key_bindings != NULL);
 254
 255         g_hash_table_remove_all(pk->key_bindings);
 256 }
 257
 258 static void
 259 bind_keys_qwerty(PianoKeyboard *pk)
 260 {
 261         clear_notes(pk);
 262
 263         bind_key(pk, "space", 128);
 264
 265         /* Lower keyboard row - "zxcvbnm". */
 266         bind_key(pk, "z", 12);  /* C0 */
 267         bind_key(pk, "s", 13);
 268         bind_key(pk, "x", 14);
 269         bind_key(pk, "d", 15);
 270         bind_key(pk, "c", 16);
 271         bind_key(pk, "v", 17);
 272         bind_key(pk, "g", 18);
 273         bind_key(pk, "b", 19);
 274         bind_key(pk, "h", 20);
 275         bind_key(pk, "n", 21);
 276         bind_key(pk, "j", 22);
 277         bind_key(pk, "m", 23);
 278
 279         /* Upper keyboard row, first octave - "qwertyu". */
 280         bind_key(pk, "q", 24);
 281         bind_key(pk, "2", 25);
 282         bind_key(pk, "w", 26);
 283         bind_key(pk, "3", 27);
 284         bind_key(pk, "e", 28);
 285         bind_key(pk, "r", 29);
 286         bind_key(pk, "5", 30);
 287         bind_key(pk, "t", 31);
 288         bind_key(pk, "6", 32);
 289         bind_key(pk, "y", 33);
 290         bind_key(pk, "7", 34);
 291         bind_key(pk, "u", 35);
 292
 293         /* Upper keyboard row, the rest - "iop". */
 294         bind_key(pk, "i", 36);
 295         bind_key(pk, "9", 37);
 296         bind_key(pk, "o", 38);
 297         bind_key(pk, "0", 39);
 298         bind_key(pk, "p", 40);
 299 }
 300
 301 static void
 302 bind_keys_qwertz(PianoKeyboard *pk)
 303 {
 304         bind_keys_qwerty(pk);
 305
 306         /* The only difference between QWERTY and QWERTZ is that the "y" and "z" are swapped together. */
 307         bind_key(pk, "y", 12);
 308         bind_key(pk, "z", 33);
 309 }
 310
 311 static void
 312 bind_keys_azerty(PianoKeyboard *pk)
 313 {
 314         clear_notes(pk);
 315
 316         bind_key(pk, "space", 128);
 317
 318         /* Lower keyboard row - "wxcvbn,". */
 319         bind_key(pk, "w", 12);  /* C0 */
 320         bind_key(pk, "s", 13);
 321         bind_key(pk, "x", 14);
 322         bind_key(pk, "d", 15);
 323         bind_key(pk, "c", 16);
 324         bind_key(pk, "v", 17);
 325         bind_key(pk, "g", 18);
 326         bind_key(pk, "b", 19);
 327         bind_key(pk, "h", 20);
 328         bind_key(pk, "n", 21);
 329         bind_key(pk, "j", 22);
 330         bind_key(pk, "comma", 23);
 331
 332         /* Upper keyboard row, first octave - "azertyu". */
 333         bind_key(pk, "a", 24);
 334         bind_key(pk, "eacute", 25);
 335         bind_key(pk, "z", 26);
 336         bind_key(pk, "quotedbl", 27);
 337         bind_key(pk, "e", 28);
 338         bind_key(pk, "r", 29);
 339         bind_key(pk, "parenleft", 30);
 340         bind_key(pk, "t", 31);
 341         bind_key(pk, "minus", 32);
 342         bind_key(pk, "y", 33);
 343         bind_key(pk, "egrave", 34);
 344         bind_key(pk, "u", 35);
 345
 346         /* Upper keyboard row, the rest - "iop". */
 347         bind_key(pk, "i", 36);
 348         bind_key(pk, "ccedilla", 37);
 349         bind_key(pk, "o", 38);
 350         bind_key(pk, "agrave", 39);
 351         bind_key(pk, "p", 40);
 352 }
 353
 354 static gint
 355 keyboard_event_handler(GtkWidget *mk, GdkEventKey *event, gpointer notused)
 356 {
 357         int             note;
 358         char            *key;
 359         guint           keyval;
 360         GdkKeymapKey    kk;
 361         PianoKeyboard   *pk = PIANO_KEYBOARD(mk);
 362
 363         /* We're not using event->keyval, because we need keyval with level set to 0.
 364            E.g. if user holds Shift and presses '7', we want to get a '7', not '&'. */
 365         kk.keycode = event->hardware_keycode;
 366         kk.level = 0;
 367         kk.group = 0;
 368
 369         keyval = gdk_keymap_lookup_key(NULL, &kk);
 370
 371         key = gdk_keyval_name(gdk_keyval_to_lower(keyval));
 372
 373         if (key == NULL) {
 374                 g_message("gtk_keyval_name() returned NULL; please report this.");
 375                 return FALSE;
 376         }
 377
 378         note = key_binding(pk, key);
 379
 380         if (note < 0) {
 381                 /* Key was not bound.  Maybe it's one of the keys handled in jack-keyboard.c. */
 382                 return FALSE;
 383         }
 384
 385         if (note == 128) {
 386                 if (event->type == GDK_KEY_RELEASE) {
 387                         rest (pk);
 388                 }
 389
 390                 return TRUE;
 391         }
 392
 393         note += pk->octave * 12;
 394
 395         assert(note >= 0);
 396         assert(note < NNOTES);
 397
 398         if (event->type == GDK_KEY_PRESS) {
 399                 press_key(pk, note);
 400
 401         } else if (event->type == GDK_KEY_RELEASE) {
 402                 release_key(pk, note);
 403         }
 404
 405         return TRUE;
 406 }
 407
 408 static int
 409 get_note_for_xy(PianoKeyboard *pk, int x, int y)
 410 {
 411         int             height = GTK_WIDGET(pk)->allocation.height;
 412         int             note;
 413
 414         if (y <= height / 2) {
 415                 for (note = 0; note < NNOTES - 1; note++) {
 416                         if (pk->notes[note].white)
 417                                 continue;
 418
 419                         if (x >= pk->notes[note].x && x <= pk->notes[note].x + pk->notes[note].w)
 420                                 return note;
 421                 }
 422         }
 423
 424         for (note = 0; note < NNOTES - 1; note++) {
 425                 if (!pk->notes[note].white)
 426                         continue;
 427
 428                 if (x >= pk->notes[note].x && x <= pk->notes[note].x + pk->notes[note].w)
 429                         return note;
 430         }
 431
 432         return -1;
 433 }
 434
 435 static gboolean
 436 mouse_button_event_handler(PianoKeyboard *pk, GdkEventButton *event, gpointer notused)
 437 {
 438         int             x = event->x;
 439         int             y = event->y;
 440
 441         int             note = get_note_for_xy(pk, x, y);
 442
 443         if (event->button != 1)
 444                 return TRUE;
 445
 446         if (event->type == GDK_BUTTON_PRESS) {
 447                 /* This is possible when you make the window a little wider and then click
 448                    on the grey area. */
 449                 if (note < 0) {
 450                         return TRUE;
 451                 }
 452
 453                 if (pk->note_being_pressed_using_mouse >= 0)
 454                         release_key(pk, pk->note_being_pressed_using_mouse);
 455
 456                 press_key(pk, note);
 457                 pk->note_being_pressed_using_mouse = note;
 458
 459         } else if (event->type == GDK_BUTTON_RELEASE) {
 460                 if (note >= 0) {
 461                         release_key(pk, note);
 462
 463                 } else {
 464                         if (pk->note_being_pressed_using_mouse >= 0)
 465                                 release_key(pk, pk->note_being_pressed_using_mouse);
 466                 }
 467
 468                 pk->note_being_pressed_using_mouse = -1;
 469
 470         }
 471
 472         return TRUE;
 473 }
 474
 475 static gboolean
 476 mouse_motion_event_handler(PianoKeyboard *pk, GdkEventMotion *event, gpointer notused)
 477 {
 478         int             note;
 479
 480         if ((event->state & GDK_BUTTON1_MASK) == 0)
 481                 return TRUE;
 482
 483         note = get_note_for_xy(pk, event->x, event->y);
 484
 485         if (note != pk->note_being_pressed_using_mouse && note >= 0) {
 486
 487                 if (pk->note_being_pressed_using_mouse >= 0)
 488                         release_key(pk, pk->note_being_pressed_using_mouse);
 489                 press_key(pk, note);
 490                 pk->note_being_pressed_using_mouse = note;
 491         }
 492
 493         return TRUE;
 494 }
 495
 496 static gboolean
 497 piano_keyboard_expose(GtkWidget *widget, GdkEventExpose *event)
 498 {
 499         int i;
 500         PianoKeyboard *pk = PIANO_KEYBOARD(widget);
 501         cairo_t* cr = gdk_cairo_create (GDK_DRAWABLE (GTK_WIDGET(pk)->window));
 502
 503         gdk_cairo_region (cr, event->region);
 504         cairo_clip (cr);
 505
 506         for (i = 0; i < NNOTES; i++) {
 507                 GdkRectangle r;
 508
 509                 r.x = pk->notes[i].x;
 510                 r.y = 0;
 511                 r.width = pk->notes[i].w;
 512                 r.height = pk->notes[i].h;
 513
 514                 switch (gdk_region_rect_in (event->region, &r)) {
 515                 case GDK_OVERLAP_RECTANGLE_PART:
 516                 case GDK_OVERLAP_RECTANGLE_IN:
 517                         draw_note (pk, cr, i);
 518                         break;
 519                 default:
 520                         break;
 521                 }
 522         }
 523
 524         cairo_destroy (cr);
 525
 526         return TRUE;
 527 }
 528
 529 static void
 530 piano_keyboard_size_request(GtkWidget* widget, GtkRequisition *requisition)
 531 {
 532         requisition->width = PIANO_KEYBOARD_DEFAULT_WIDTH;
 533         requisition->height = PIANO_KEYBOARD_DEFAULT_HEIGHT;
 534 }
 535
 536 static void
 537 recompute_dimensions(PianoKeyboard *pk)
 538 {
 539         int             number_of_white_keys = (NNOTES - 1) * (7.0 / 12.0);
 540
 541         int             key_width;
 542         int             black_key_width;
 543         int             useful_width;
 544
 545         int             note;
 546         int             white_key = 0;
 547         int             note_in_octave;
 548
 549         int             width = GTK_WIDGET(pk)->allocation.width;
 550         int             height = GTK_WIDGET(pk)->allocation.height;
 551
 552         key_width = width / number_of_white_keys;
 553         black_key_width = key_width * 0.8;
 554         useful_width = number_of_white_keys * key_width;
 555         pk->widget_margin = (width - useful_width) / 2;
 556
 557         for (note = 0, white_key = 0; note < NNOTES - 2; note++) {
 558                 note_in_octave = note % 12;
 559
 560                 if (note_in_octave == 1 || note_in_octave == 3 || note_in_octave == 6 ||
 561                         note_in_octave == 8 || note_in_octave == 10) {
 562
 563                         /* This note is black key. */
 564                         pk->notes[note].x = pk->widget_margin + white_key * key_width - black_key_width / 2;
 565                         pk->notes[note].w = black_key_width;
 566                         pk->notes[note].h = height / 2;
 567                         pk->notes[note].white = 0;
 568
 569                         continue;
 570                 }
 571
 572                 /* This note is white key. */
 573                 pk->notes[note].x = pk->widget_margin + white_key * key_width;
 574                 pk->notes[note].w = key_width;
 575                 pk->notes[note].h = height;
 576                 pk->notes[note].white = 1;
 577
 578                 white_key++;
 579         }
 580 }
 581
 582 static void
 583 piano_keyboard_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
 584 {
 585         /* XXX: Are these two needed? */
 586         g_return_if_fail(widget != NULL);
 587         g_return_if_fail(allocation != NULL);
 588
 589         widget->allocation = *allocation;
 590
 591         recompute_dimensions(PIANO_KEYBOARD(widget));
 592
 593         if (GTK_WIDGET_REALIZED(widget)) {
 594                 gdk_window_move_resize (widget->window, allocation->x, allocation->y, allocation->width, allocation->height);
 595         }
 596 }
 597
 598 static void
 599 piano_keyboard_class_init(PianoKeyboardClass *klass)
 600 {
 601         GtkWidgetClass  *widget_klass;
 602
 603         /* Set up signals. */
 604         piano_keyboard_signals[NOTE_ON_SIGNAL] = g_signal_new ("note-on",
 605                 G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
 606                 0, NULL, NULL, g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
 607
 608         piano_keyboard_signals[NOTE_OFF_SIGNAL] = g_signal_new ("note-off",
 609                 G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
 610                 0, NULL, NULL, g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
 611
 612         piano_keyboard_signals[REST_SIGNAL] = g_signal_new ("rest",
 613                 G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
 614                 0, NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 615
 616         widget_klass = (GtkWidgetClass*) klass;
 617
 618         widget_klass->expose_event = piano_keyboard_expose;
 619         widget_klass->size_request = piano_keyboard_size_request;
 620         widget_klass->size_allocate = piano_keyboard_size_allocate;
 621 }
 622
 623 static void
 624 piano_keyboard_init(GtkWidget *mk)
 625 {
 626         gtk_widget_add_events(mk, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK);
 627
 628         g_signal_connect(G_OBJECT(mk), "button-press-event", G_CALLBACK(mouse_button_event_handler), NULL);
 629         g_signal_connect(G_OBJECT(mk), "button-release-event", G_CALLBACK(mouse_button_event_handler), NULL);
 630         g_signal_connect(G_OBJECT(mk), "motion-notify-event", G_CALLBACK(mouse_motion_event_handler), NULL);
 631         g_signal_connect(G_OBJECT(mk), "key-press-event", G_CALLBACK(keyboard_event_handler), NULL);
 632         g_signal_connect(G_OBJECT(mk), "key-release-event", G_CALLBACK(keyboard_event_handler), NULL);
 633 }
 634
 635 GType
 636 piano_keyboard_get_type(void)
 637 {
 638         static GType mk_type = 0;
 639
 640         if (!mk_type) {
 641                 static const GTypeInfo mk_info = {
 642                         sizeof(PianoKeyboardClass),
 643                         NULL, /* base_init */
 644                         NULL, /* base_finalize */
 645                         (GClassInitFunc) piano_keyboard_class_init,
 646                         NULL, /* class_finalize */
 647                         NULL, /* class_data */
 648                         sizeof (PianoKeyboard),
 649                         0,    /* n_preallocs */
 650                         (GInstanceInitFunc) piano_keyboard_init,
 651                         0,    /* value_table */
 652                 };
 653
 654                 mk_type = g_type_register_static(GTK_TYPE_DRAWING_AREA, "PianoKeyboard", &mk_info, 0);
 655         }
 656
 657         return mk_type;
 658 }
 659
 660 GtkWidget *
 661 piano_keyboard_new(void)
 662 {
 663         GtkWidget *widget = gtk_type_new(piano_keyboard_get_type());
 664
 665         PianoKeyboard *pk = PIANO_KEYBOARD(widget);
 666
 667         pk->maybe_stop_sustained_notes = 0;
 668         pk->sustain_new_notes = 0;
 669         pk->enable_keyboard_cue = 0;
 670         pk->octave = 4;
 671         pk->note_being_pressed_using_mouse = -1;
 672         memset((void *)pk->notes, 0, sizeof(struct Note) * NNOTES);
 673         pk->key_bindings = g_hash_table_new(g_str_hash, g_str_equal);
 674         bind_keys_qwerty(pk);
 675
 676         return widget;
 677 }
 678
 679 void
 680 piano_keyboard_set_keyboard_cue(PianoKeyboard *pk, int enabled)
 681 {
 682         pk->enable_keyboard_cue = enabled;
 683 }
 684
 685 void
 686 piano_keyboard_sustain_press(PianoKeyboard *pk)
 687 {
 688         if (!pk->sustain_new_notes) {
 689                 pk->sustain_new_notes = 1;
 690                 pk->maybe_stop_sustained_notes = 1;
 691         }
 692 }
 693
 694 void
 695 piano_keyboard_sustain_release(PianoKeyboard *pk)
 696 {
 697         if (pk->maybe_stop_sustained_notes)
 698                 stop_sustained_notes(pk);
 699
 700         pk->sustain_new_notes = 0;
 701 }
 702
 703 void
 704 piano_keyboard_set_note_on(PianoKeyboard *pk, int note)
 705 {
 706         if (pk->notes[note].pressed == 0) {
 707                 pk->notes[note].pressed = 1;
 708                 queue_note_draw (pk, note);
 709         }
 710 }
 711
 712 void
 713 piano_keyboard_set_note_off(PianoKeyboard *pk, int note)
 714 {
 715         if (pk->notes[note].pressed || pk->notes[note].sustained) {
 716                 pk->notes[note].pressed = 0;
 717                 pk->notes[note].sustained = 0;
 718                 queue_note_draw (pk, note);
 719         }
 720 }
 721
 722 void
 723 piano_keyboard_set_octave(PianoKeyboard *pk, int octave)
 724 {
 725         stop_unsustained_notes(pk);
 726         pk->octave = octave;
 727         gtk_widget_queue_draw(GTK_WIDGET(pk));
 728 }
 729
 730 gboolean
 731 piano_keyboard_set_keyboard_layout(PianoKeyboard *pk, const char *layout)
 732 {
 733         assert(layout);
 734
 735         if (!strcasecmp(layout, "QWERTY")) {
 736                 bind_keys_qwerty(pk);
 737
 738         } else if (!strcasecmp(layout, "QWERTZ")) {
 739                 bind_keys_qwertz(pk);
 740
 741         } else if (!strcasecmp(layout, "AZERTY")) {
 742                 bind_keys_azerty(pk);
 743
 744         } else {
 745                 /* Unknown layout name. */
 746                 return TRUE;
 747         }
 748
 749         return FALSE;
 750 }