src/pianokeyboard.c

   1 /*-
   2  * Copyright (c) 2007, 2008 Edward Tomasz Napierała <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 <gtk/gtk.h>
  37 #include <gdk/gdkkeysyms.h>
  38
  39 #include "pianokeyboard.h"
  40
  41 #define PIANO_KEYBOARD_DEFAULT_WIDTH 730
  42 #define PIANO_KEYBOARD_DEFAULT_HEIGHT 70
  43
  44 enum {
  45         NOTE_ON_SIGNAL,
  46         NOTE_OFF_SIGNAL,
  47         LAST_SIGNAL
  48 };
  49
  50 static guint    piano_keyboard_signals[LAST_SIGNAL] = { 0 };
  51
  52 static void
  53 draw_keyboard_cue(PianoKeyboard *pk)
  54 {
  55         int w, h, first_note_in_lower_row, last_note_in_lower_row,
  56             first_note_in_higher_row, last_note_in_higher_row;
  57
  58         GdkGC *gc;
  59
  60         w = pk->notes[0].w;
  61         h = pk->notes[0].h;
  62
  63         gc = GTK_WIDGET(pk)->style->fg_gc[0];
  64
  65         first_note_in_lower_row = (pk->octave + 5) * 12;
  66         last_note_in_lower_row = (pk->octave + 6) * 12 - 1;
  67         first_note_in_higher_row = (pk->octave + 6) * 12;
  68         last_note_in_higher_row = (pk->octave + 7) * 12 + 4;
  69
  70         gdk_draw_line(GTK_WIDGET(pk)->window, gc, pk->notes[first_note_in_lower_row].x + 3,
  71             h - 6, pk->notes[last_note_in_lower_row].x + w - 3, h - 6);
  72
  73         gdk_draw_line(GTK_WIDGET(pk)->window, gc, pk->notes[first_note_in_higher_row].x + 3,
  74             h - 9, pk->notes[last_note_in_higher_row].x + w - 3, h - 9);
  75 }
  76
  77 static void
  78 draw_note(PianoKeyboard *pk, int note)
  79 {
  80         int is_white, x, w, h;
  81
  82         GdkColor black = {0, 0, 0, 0};
  83         GdkColor white = {0, 65535, 65535, 65535};
  84
  85         GdkGC *gc = GTK_WIDGET(pk)->style->fg_gc[0];
  86         GtkWidget *widget;
  87
  88         is_white = pk->notes[note].white;
  89
  90         x = pk->notes[note].x;
  91         w = pk->notes[note].w;
  92         h = pk->notes[note].h;
  93
  94         if (pk->notes[note].pressed || pk->notes[note].sustained)
  95                 is_white = !is_white;
  96
  97         if (is_white)
  98                 gdk_gc_set_rgb_fg_color(gc, &white);
  99         else
 100                 gdk_gc_set_rgb_fg_color(gc, &black);
 101
 102         gdk_draw_rectangle(GTK_WIDGET(pk)->window, gc, TRUE, x, 0, w, h);
 103         gdk_gc_set_rgb_fg_color(gc, &black);
 104         gdk_draw_rectangle(GTK_WIDGET(pk)->window, gc, FALSE, x, 0, w, h);
 105
 106         if (pk->enable_keyboard_cue)
 107                 draw_keyboard_cue(pk);
 108
 109         /* We need to redraw black keys that partially obscure the white one. */
 110         if (note < NNOTES - 2 && !pk->notes[note + 1].white)
 111                 draw_note(pk, note + 1);
 112
 113         if (note > 0 && !pk->notes[note - 1].white)
 114                 draw_note(pk, note - 1);
 115
 116         /*
 117          * XXX: This doesn't really belong here.  Originally I wanted to pack PianoKeyboard into GtkFrame
 118          * packed into GtkAlignment.  I failed to make it behave the way I want.  GtkFrame would need
 119          * to adapt to the "proper" size of PianoKeyboard, i.e. to the useful_width, not allocated width;
 120          * that didn't work.
 121          */
 122         widget = GTK_WIDGET(pk);
 123         gtk_paint_shadow(widget->style, widget->window, GTK_STATE_NORMAL, GTK_SHADOW_IN, NULL,
 124             widget, NULL, pk->widget_margin, 0, widget->allocation.width - pk->widget_margin * 2 + 1,
 125             widget->allocation.height);
 126 }
 127
 128 static int
 129 press_key(PianoKeyboard *pk, int key)
 130 {
 131         assert(key >= 0);
 132         assert(key < NNOTES);
 133
 134         pk->maybe_stop_sustained_notes = 0;
 135
 136         /* This is for keyboard autorepeat protection. */
 137         if (pk->notes[key].pressed)
 138                 return (0);
 139
 140         if (pk->sustain_new_notes)
 141                 pk->notes[key].sustained = 1;
 142         else
 143                 pk->notes[key].sustained = 0;
 144
 145         pk->notes[key].pressed = 1;
 146
 147         g_signal_emit_by_name(GTK_WIDGET(pk), "note-on", key);
 148         draw_note(pk, key);
 149
 150         return (1);
 151 }
 152
 153 static int
 154 release_key(PianoKeyboard *pk, int key)
 155 {
 156         assert(key >= 0);
 157         assert(key < NNOTES);
 158
 159         pk->maybe_stop_sustained_notes = 0;
 160
 161         if (!pk->notes[key].pressed)
 162                 return (0);
 163
 164         if (pk->sustain_new_notes)
 165                 pk->notes[key].sustained = 1;
 166
 167         pk->notes[key].pressed = 0;
 168
 169         if (pk->notes[key].sustained)
 170                 return (0);
 171
 172         g_signal_emit_by_name(GTK_WIDGET(pk), "note-off", key);
 173         draw_note(pk, key);
 174
 175         return (1);
 176 }
 177
 178 static void
 179 stop_unsustained_notes(PianoKeyboard *pk)
 180 {
 181         int i;
 182
 183         for (i = 0; i < NNOTES; i++) {
 184                 if (pk->notes[i].pressed && !pk->notes[i].sustained) {
 185                         pk->notes[i].pressed = 0;
 186                         g_signal_emit_by_name(GTK_WIDGET(pk), "note-off", i);
 187                         draw_note(pk, i);
 188                 }
 189         }
 190 }
 191
 192 static void
 193 stop_sustained_notes(PianoKeyboard *pk)
 194 {
 195         int i;
 196
 197         for (i = 0; i < NNOTES; i++) {
 198                 if (pk->notes[i].sustained) {
 199                         pk->notes[i].pressed = 0;
 200                         pk->notes[i].sustained = 0;
 201                         g_signal_emit_by_name(GTK_WIDGET(pk), "note-off", i);
 202                         draw_note(pk, i);
 203                 }
 204         }
 205 }
 206
 207 static int
 208 key_binding(PianoKeyboard *pk, const char *key)
 209 {
 210         gpointer notused, note;
 211         gboolean found;
 212
 213         assert(pk->key_bindings != NULL);
 214
 215         found = g_hash_table_lookup_extended(pk->key_bindings, key, &notused, &note);
 216
 217         if (!found)
 218                 return (-1);
 219
 220         return ((int)note);
 221 }
 222
 223 static void
 224 bind_key(PianoKeyboard *pk, const char *key, int note)
 225 {
 226         assert(pk->key_bindings != NULL);
 227
 228         g_hash_table_insert(pk->key_bindings, (gpointer)key, (gpointer)note);
 229 }
 230
 231 static void
 232 clear_notes(PianoKeyboard *pk)
 233 {
 234         assert(pk->key_bindings != NULL);
 235
 236         g_hash_table_remove_all(pk->key_bindings);
 237 }
 238
 239 static void
 240 bind_keys_qwerty(PianoKeyboard *pk)
 241 {
 242         clear_notes(pk);
 243
 244         /* Lower keyboard row - "zxcvbnm". */
 245         bind_key(pk, "z", 12);  /* C0 */
 246         bind_key(pk, "s", 13);
 247         bind_key(pk, "x", 14);
 248         bind_key(pk, "d", 15);
 249         bind_key(pk, "c", 16);
 250         bind_key(pk, "v", 17);
 251         bind_key(pk, "g", 18);
 252         bind_key(pk, "b", 19);
 253         bind_key(pk, "h", 20);
 254         bind_key(pk, "n", 21);
 255         bind_key(pk, "j", 22);
 256         bind_key(pk, "m", 23);
 257
 258         /* Upper keyboard row, first octave - "qwertyu". */
 259         bind_key(pk, "q", 24);
 260         bind_key(pk, "2", 25);
 261         bind_key(pk, "w", 26);
 262         bind_key(pk, "3", 27);
 263         bind_key(pk, "e", 28);
 264         bind_key(pk, "r", 29);
 265         bind_key(pk, "5", 30);
 266         bind_key(pk, "t", 31);
 267         bind_key(pk, "6", 32);
 268         bind_key(pk, "y", 33);
 269         bind_key(pk, "7", 34);
 270         bind_key(pk, "u", 35);
 271
 272         /* Upper keyboard row, the rest - "iop". */
 273         bind_key(pk, "i", 36);
 274         bind_key(pk, "9", 37);
 275         bind_key(pk, "o", 38);
 276         bind_key(pk, "0", 39);
 277         bind_key(pk, "p", 40);
 278 }
 279
 280 static void
 281 bind_keys_qwertz(PianoKeyboard *pk)
 282 {
 283         bind_keys_qwerty(pk);
 284
 285         /* The only difference between QWERTY and QWERTZ is that the "y" and "z" are swapped together. */
 286         bind_key(pk, "y", 12);
 287         bind_key(pk, "z", 33);
 288 }
 289
 290 static void
 291 bind_keys_azerty(PianoKeyboard *pk)
 292 {
 293         clear_notes(pk);
 294
 295         /* Lower keyboard row - "wxcvbn,". */
 296         bind_key(pk, "w", 12);  /* C0 */
 297         bind_key(pk, "s", 13);
 298         bind_key(pk, "x", 14);
 299         bind_key(pk, "d", 15);
 300         bind_key(pk, "c", 16);
 301         bind_key(pk, "v", 17);
 302         bind_key(pk, "g", 18);
 303         bind_key(pk, "b", 19);
 304         bind_key(pk, "h", 20);
 305         bind_key(pk, "n", 21);
 306         bind_key(pk, "j", 22);
 307         bind_key(pk, "comma", 23);
 308
 309         /* Upper keyboard row, first octave - "azertyu". */
 310         bind_key(pk, "a", 24);
 311         bind_key(pk, "eacute", 25);
 312         bind_key(pk, "z", 26);
 313         bind_key(pk, "quotedbl", 27);
 314         bind_key(pk, "e", 28);
 315         bind_key(pk, "r", 29);
 316         bind_key(pk, "parenleft", 30);
 317         bind_key(pk, "t", 31);
 318         bind_key(pk, "minus", 32);
 319         bind_key(pk, "y", 33);
 320         bind_key(pk, "egrave", 34);
 321         bind_key(pk, "u", 35);
 322
 323         /* Upper keyboard row, the rest - "iop". */
 324         bind_key(pk, "i", 36);
 325         bind_key(pk, "ccedilla", 37);
 326         bind_key(pk, "o", 38);
 327         bind_key(pk, "agrave", 39);
 328         bind_key(pk, "p", 40);
 329 }
 330
 331 static gint
 332 keyboard_event_handler(GtkWidget *mk, GdkEventKey *event, gpointer notused)
 333 {
 334         int note;
 335         char *key;
 336         guint keyval;
 337         GdkKeymapKey kk;
 338         PianoKeyboard *pk = PIANO_KEYBOARD(mk);
 339
 340         /* We're not using event->keyval, because we need keyval with level set to 0.
 341            E.g. if user holds Shift and presses '7', we want to get a '7', not '&'. */
 342         kk.keycode = event->hardware_keycode;
 343         kk.level = 0;
 344         kk.group = 0;
 345
 346         keyval = gdk_keymap_lookup_key(NULL, &kk);
 347
 348         key = gdk_keyval_name(gdk_keyval_to_lower(keyval));
 349
 350         if (key == NULL) {
 351                 g_message("gtk_keyval_name() returned NULL; please report this.");
 352                 return (FALSE);
 353         }
 354
 355         note = key_binding(pk, key);
 356
 357         if (note < 0) {
 358                 /* Key was not bound.  Maybe it's one of the keys handled in jack-keyboard.c. */
 359                 return (FALSE);
 360         }
 361
 362         note += pk->octave * 12;
 363
 364         assert(note >= 0);
 365         assert(note < NNOTES);
 366
 367         if (event->type == GDK_KEY_PRESS) {
 368                 press_key(pk, note);
 369
 370         } else if (event->type == GDK_KEY_RELEASE) {
 371                 release_key(pk, note);
 372         }
 373
 374         return (TRUE);
 375 }
 376
 377 static int
 378 get_note_for_xy(PianoKeyboard *pk, int x, int y)
 379 {
 380         int height, note;
 381
 382         height = GTK_WIDGET(pk)->allocation.height;
 383
 384         if (y <= height / 2) {
 385                 for (note = 0; note < NNOTES - 1; note++) {
 386                         if (pk->notes[note].white)
 387                                 continue;
 388
 389                         if (x >= pk->notes[note].x && x <= pk->notes[note].x + pk->notes[note].w)
 390                                 return (note);
 391                 }
 392         }
 393
 394         for (note = 0; note < NNOTES - 1; note++) {
 395                 if (!pk->notes[note].white)
 396                         continue;
 397
 398                 if (x >= pk->notes[note].x && x <= pk->notes[note].x + pk->notes[note].w)
 399                         return (note);
 400         }
 401
 402         return (-1);
 403 }
 404
 405 static gboolean
 406 mouse_button_event_handler(PianoKeyboard *pk, GdkEventButton *event, gpointer notused)
 407 {
 408         int x, y, note;
 409
 410         x = event->x;
 411         y = event->y;
 412
 413         note = get_note_for_xy(pk, x, y);
 414
 415         if (event->button != 1)
 416                 return (TRUE);
 417
 418         if (event->type == GDK_BUTTON_PRESS) {
 419                 /* This is possible when you make the window a little wider and then click
 420                    on the grey area. */
 421                 if (note < 0) {
 422                         return (TRUE);
 423                 }
 424
 425                 if (pk->note_being_pressed_using_mouse >= 0)
 426                         release_key(pk, pk->note_being_pressed_using_mouse);
 427
 428                 press_key(pk, note);
 429                 pk->note_being_pressed_using_mouse = note;
 430
 431         } else if (event->type == GDK_BUTTON_RELEASE) {
 432                 if (note >= 0) {
 433                         release_key(pk, note);
 434
 435                 } else {
 436                         if (pk->note_being_pressed_using_mouse >= 0)
 437                                 release_key(pk, pk->note_being_pressed_using_mouse);
 438                 }
 439
 440                 pk->note_being_pressed_using_mouse = -1;
 441
 442         }
 443
 444         return (TRUE);
 445 }
 446
 447 static gboolean
 448 mouse_motion_event_handler(PianoKeyboard *pk, GdkEventMotion *event, gpointer notused)
 449 {
 450         int note;
 451
 452         if ((event->state & GDK_BUTTON1_MASK) == 0)
 453                 return (TRUE);
 454
 455         note = get_note_for_xy(pk, event->x, event->y);
 456
 457         if (note != pk->note_being_pressed_using_mouse && note >= 0) {
 458
 459                 if (pk->note_being_pressed_using_mouse >= 0)
 460                         release_key(pk, pk->note_being_pressed_using_mouse);
 461                 press_key(pk, note);
 462                 pk->note_being_pressed_using_mouse = note;
 463         }
 464
 465         return (TRUE);
 466 }
 467
 468 static gboolean
 469 piano_keyboard_expose(GtkWidget *widget, GdkEventExpose *event)
 470 {
 471         int i;
 472         PianoKeyboard *pk = PIANO_KEYBOARD(widget);
 473
 474         for (i = 0; i < NNOTES; i++)
 475                 draw_note(pk, i);
 476
 477         return (TRUE);
 478 }
 479
 480 static void
 481 piano_keyboard_size_request(GtkWidget *widget, GtkRequisition *requisition)
 482 {
 483         requisition->width = PIANO_KEYBOARD_DEFAULT_WIDTH;
 484         requisition->height = PIANO_KEYBOARD_DEFAULT_HEIGHT;
 485 }
 486
 487 static void
 488 recompute_dimensions(PianoKeyboard *pk)
 489 {
 490         int number_of_white_keys, key_width, black_key_width, useful_width, note,
 491             white_key = 0, note_in_octave, width, height;
 492
 493         number_of_white_keys = (NNOTES - 1) * (7.0 / 12.0);
 494
 495         width = GTK_WIDGET(pk)->allocation.width;
 496         height = GTK_WIDGET(pk)->allocation.height;
 497
 498         key_width = width / number_of_white_keys;
 499         black_key_width = key_width * 0.8;
 500         useful_width = number_of_white_keys * key_width;
 501         pk->widget_margin = (width - useful_width) / 2;
 502
 503         for (note = 0, white_key = 0; note < NNOTES - 2; note++) {
 504                 note_in_octave = note % 12;
 505
 506                 if (note_in_octave == 1 || note_in_octave == 3 || note_in_octave == 6 ||
 507                     note_in_octave == 8 || note_in_octave == 10) {
 508
 509                         /* This note is black key. */
 510                         pk->notes[note].x = pk->widget_margin + white_key * key_width - black_key_width / 2;
 511                         pk->notes[note].w = black_key_width;
 512                         pk->notes[note].h = height / 2;
 513                         pk->notes[note].white = 0;
 514
 515                         continue;
 516                 }
 517
 518                 /* This note is white key. */
 519                 pk->notes[note].x = pk->widget_margin + white_key * key_width;
 520                 pk->notes[note].w = key_width;
 521                 pk->notes[note].h = height;
 522                 pk->notes[note].white = 1;
 523
 524                 white_key++;
 525         }
 526 }
 527
 528 static void
 529 piano_keyboard_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
 530 {
 531         /* XXX: Are these two needed? */
 532         g_return_if_fail(widget != NULL);
 533         g_return_if_fail(allocation != NULL);
 534
 535         widget->allocation = *allocation;
 536
 537         recompute_dimensions(PIANO_KEYBOARD(widget));
 538
 539         if (GTK_WIDGET_REALIZED(widget))
 540                 gdk_window_move_resize (widget->window, allocation->x, allocation->y, allocation->width, allocation->height);
 541 }
 542
 543 static void
 544 piano_keyboard_class_init(PianoKeyboardClass *klass)
 545 {
 546         GtkWidgetClass *widget_klass;
 547
 548         /* Set up signals. */
 549         piano_keyboard_signals[NOTE_ON_SIGNAL] = g_signal_new ("note-on",
 550             G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
 551             0, NULL, NULL, g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
 552
 553         piano_keyboard_signals[NOTE_OFF_SIGNAL] = g_signal_new ("note-off",
 554             G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
 555             0, NULL, NULL, g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
 556
 557         widget_klass = (GtkWidgetClass*)klass;
 558
 559         widget_klass->expose_event = piano_keyboard_expose;
 560         widget_klass->size_request = piano_keyboard_size_request;
 561         widget_klass->size_allocate = piano_keyboard_size_allocate;
 562 }
 563
 564 static void
 565 piano_keyboard_init(GtkWidget *mk)
 566 {
 567         gtk_widget_add_events(mk, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK);
 568
 569         g_signal_connect(G_OBJECT(mk), "button-press-event", G_CALLBACK(mouse_button_event_handler), NULL);
 570         g_signal_connect(G_OBJECT(mk), "button-release-event", G_CALLBACK(mouse_button_event_handler), NULL);
 571         g_signal_connect(G_OBJECT(mk), "motion-notify-event", G_CALLBACK(mouse_motion_event_handler), NULL);
 572         g_signal_connect(G_OBJECT(mk), "key-press-event", G_CALLBACK(keyboard_event_handler), NULL);
 573         g_signal_connect(G_OBJECT(mk), "key-release-event", G_CALLBACK(keyboard_event_handler), NULL);
 574 }
 575
 576 GType
 577 piano_keyboard_get_type(void)
 578 {
 579         static GType mk_type = 0;
 580
 581         if (!mk_type) {
 582                 static const GTypeInfo mk_info = {
 583                         sizeof(PianoKeyboardClass),
 584                         NULL, /* base_init */
 585                         NULL, /* base_finalize */
 586                         (GClassInitFunc) piano_keyboard_class_init,
 587                         NULL, /* class_finalize */
 588                         NULL, /* class_data */
 589                         sizeof (PianoKeyboard),
 590                         0,    /* n_preallocs */
 591                         (GInstanceInitFunc) piano_keyboard_init,
 592                 };
 593
 594                 mk_type = g_type_register_static(GTK_TYPE_DRAWING_AREA, "PianoKeyboard", &mk_info, 0);
 595         }
 596
 597         return (mk_type);
 598 }
 599
 600 GtkWidget *
 601 piano_keyboard_new(void)
 602 {
 603         GtkWidget *widget;
 604         PianoKeyboard *pk;
 605
 606         widget = gtk_type_new(piano_keyboard_get_type());
 607         pk = PIANO_KEYBOARD(widget);
 608
 609         pk->maybe_stop_sustained_notes = 0;
 610         pk->sustain_new_notes = 0;
 611         pk->enable_keyboard_cue = 0;
 612         pk->octave = 4;
 613         pk->note_being_pressed_using_mouse = -1;
 614         memset((void *)pk->notes, 0, sizeof(struct Note) * NNOTES);
 615         pk->key_bindings = g_hash_table_new(g_str_hash, g_str_equal);
 616         bind_keys_qwerty(pk);
 617
 618         return (widget);
 619 }
 620
 621 void
 622 piano_keyboard_set_keyboard_cue(PianoKeyboard *pk, int enabled)
 623 {
 624         pk->enable_keyboard_cue = enabled;
 625 }
 626
 627 void
 628 piano_keyboard_sustain_press(PianoKeyboard *pk)
 629 {
 630         if (!pk->sustain_new_notes) {
 631                 pk->sustain_new_notes = 1;
 632                 pk->maybe_stop_sustained_notes = 1;
 633         }
 634 }
 635
 636 void
 637 piano_keyboard_sustain_release(PianoKeyboard *pk)
 638 {
 639         if (pk->maybe_stop_sustained_notes)
 640                 stop_sustained_notes(pk);
 641
 642         pk->sustain_new_notes = 0;
 643 }
 644
 645 void
 646 piano_keyboard_set_note_on(PianoKeyboard *pk, int note)
 647 {
 648         if (pk->notes[note].pressed == 0) {
 649                 pk->notes[note].pressed = 1;
 650                 draw_note(pk, note);
 651         }
 652 }
 653
 654 void
 655 piano_keyboard_set_note_off(PianoKeyboard *pk, int note)
 656 {
 657         if (pk->notes[note].pressed || pk->notes[note].sustained) {
 658                 pk->notes[note].pressed = 0;
 659                 pk->notes[note].sustained = 0;
 660                 draw_note(pk, note);
 661         }
 662 }
 663
 664 void
 665 piano_keyboard_set_octave(PianoKeyboard *pk, int octave)
 666 {
 667         stop_unsustained_notes(pk);
 668         pk->octave = octave;
 669         gtk_widget_queue_draw(GTK_WIDGET(pk));
 670 }
 671
 672 gboolean
 673 piano_keyboard_set_keyboard_layout(PianoKeyboard *pk, const char *layout)
 674 {
 675         assert(layout);
 676
 677         if (!strcasecmp(layout, "QWERTY")) {
 678                 bind_keys_qwerty(pk);
 679
 680         } else if (!strcasecmp(layout, "QWERTZ")) {
 681                 bind_keys_qwertz(pk);
 682
 683         } else if (!strcasecmp(layout, "AZERTY")) {
 684                 bind_keys_azerty(pk);
 685
 686         } else {
 687                 /* Unknown layout name. */
 688                 return (TRUE);
 689         }
 690
 691         return (FALSE);
 692 }
 693