gtk2_ardour/gtk_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 <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                 is_white = !is_white;
 106         }
 107
 108         cairo_set_line_width (cr, 1.0);
 109
 110         if (is_white) {
 111                 cairo_set_source_rgb (cr, 1.0f, 1.0f, 1.0f);
 112         } else {
 113                 cairo_set_source_rgb (cr, 0.0f, 0.0f, 0.0f);
 114         }
 115
 116         cairo_rectangle (cr, x, 0, w, h);
 117         cairo_fill (cr);
 118
 119         cairo_set_source_rgb(cr, 0.0f, 0.0f, 0.0f); /* black outline */
 120         cairo_rectangle (cr, x, 0, w, h);
 121         cairo_stroke (cr);
 122
 123         if (pk->enable_keyboard_cue) {
 124                 draw_keyboard_cue (pk, cr);
 125         }
 126
 127         /* We need to redraw black keys that partially obscure the white one. */
 128         if (note < NNOTES - 2 && !pk->notes[note + 1].white) {
 129                 draw_note(pk, cr, note + 1);
 130         }
 131
 132         if (note > 0 && !pk->notes[note - 1].white) {
 133                 draw_note(pk, cr, note - 1);
 134         }
 135 }
 136
 137 static int
 138 press_key(PianoKeyboard *pk, int key)
 139 {
 140         assert(key >= 0);
 141         assert(key < NNOTES);
 142
 143         pk->maybe_stop_sustained_notes = 0;
 144
 145         /* This is for keyboard autorepeat protection. */
 146         if (pk->notes[key].pressed)
 147                 return 0;
 148
 149         if (pk->sustain_new_notes)
 150                 pk->notes[key].sustained = 1;
 151         else
 152                 pk->notes[key].sustained = 0;
 153
 154         pk->notes[key].pressed = 1;
 155
 156         g_signal_emit_by_name(GTK_WIDGET(pk), "note-on", key);
 157         queue_note_draw(pk, key);
 158
 159         return 1;
 160 }
 161
 162 static int
 163 release_key(PianoKeyboard *pk, int key)
 164 {
 165         assert(key >= 0);
 166         assert(key < NNOTES);
 167
 168         pk->maybe_stop_sustained_notes = 0;
 169
 170         if (!pk->notes[key].pressed)
 171                 return 0;
 172
 173         if (pk->sustain_new_notes)
 174                 pk->notes[key].sustained = 1;
 175
 176         pk->notes[key].pressed = 0;
 177
 178         if (pk->notes[key].sustained)
 179                 return 0;
 180
 181         g_signal_emit_by_name(GTK_WIDGET(pk), "note-off", key);
 182         queue_note_draw(pk, key);
 183
 184         return 1;
 185 }
 186
 187 static void
 188 rest (PianoKeyboard* pk)
 189 {
 190         g_signal_emit_by_name(GTK_WIDGET(pk), "rest");
 191 }
 192
 193 static void
 194 stop_unsustained_notes(PianoKeyboard *pk)
 195 {
 196         int             i;
 197
 198         for (i = 0; i < NNOTES; i++) {
 199                 if (pk->notes[i].pressed && !pk->notes[i].sustained) {
 200                         pk->notes[i].pressed = 0;
 201                         g_signal_emit_by_name(GTK_WIDGET(pk), "note-off", i);
 202                         queue_note_draw(pk, i);
 203                 }
 204         }
 205 }
 206
 207 static void
 208 stop_sustained_notes(PianoKeyboard *pk)
 209 {
 210         int             i;
 211
 212         for (i = 0; i < NNOTES; i++) {
 213                 if (pk->notes[i].sustained) {
 214                         pk->notes[i].pressed = 0;
 215                         pk->notes[i].sustained = 0;
 216                         g_signal_emit_by_name(GTK_WIDGET(pk), "note-off", i);
 217                         queue_note_draw(pk, i);
 218                 }
 219         }
 220 }
 221
 222 static int
 223 key_binding(PianoKeyboard *pk, const char *key)
 224 {
 225         gpointer notused, note;
 226         gboolean found;
 227
 228         assert(pk->key_bindings != NULL);
 229
 230         found = g_hash_table_lookup_extended(pk->key_bindings, key, &notused, &note);
 231
 232         if (!found)
 233                 return -1;
 234
 235         return (intptr_t)note;
 236 }
 237
 238 static void
 239 bind_key(PianoKeyboard *pk, const char *key, int note)
 240 {
 241         assert(pk->key_bindings != NULL);
 242
 243         g_hash_table_insert(pk->key_bindings, (gpointer)key, (gpointer)((intptr_t)note));
 244 }
 245
 246 static void
 247 clear_notes(PianoKeyboard *pk)
 248 {
 249         assert(pk->key_bindings != NULL);
 250
 251         g_hash_table_remove_all(pk->key_bindings);
 252 }
 253
 254 static void
 255 bind_keys_qwerty(PianoKeyboard *pk)
 256 {
 257         clear_notes(pk);
 258
 259         bind_key(pk, "space", 128);
 260
 261         /* Lower keyboard row - "zxcvbnm". */
 262         bind_key(pk, "z", 12);  /* C0 */
 263         bind_key(pk, "s", 13);
 264         bind_key(pk, "x", 14);
 265         bind_key(pk, "d", 15);
 266         bind_key(pk, "c", 16);
 267         bind_key(pk, "v", 17);
 268         bind_key(pk, "g", 18);
 269         bind_key(pk, "b", 19);
 270         bind_key(pk, "h", 20);
 271         bind_key(pk, "n", 21);
 272         bind_key(pk, "j", 22);
 273         bind_key(pk, "m", 23);
 274
 275         /* Upper keyboard row, first octave - "qwertyu". */
 276         bind_key(pk, "q", 24);
 277         bind_key(pk, "2", 25);
 278         bind_key(pk, "w", 26);
 279         bind_key(pk, "3", 27);
 280         bind_key(pk, "e", 28);
 281         bind_key(pk, "r", 29);
 282         bind_key(pk, "5", 30);
 283         bind_key(pk, "t", 31);
 284         bind_key(pk, "6", 32);
 285         bind_key(pk, "y", 33);
 286         bind_key(pk, "7", 34);
 287         bind_key(pk, "u", 35);
 288
 289         /* Upper keyboard row, the rest - "iop". */
 290         bind_key(pk, "i", 36);
 291         bind_key(pk, "9", 37);
 292         bind_key(pk, "o", 38);
 293         bind_key(pk, "0", 39);
 294         bind_key(pk, "p", 40);
 295 }
 296
 297 static void
 298 bind_keys_qwertz(PianoKeyboard *pk)
 299 {
 300         bind_keys_qwerty(pk);
 301
 302         /* The only difference between QWERTY and QWERTZ is that the "y" and "z" are swapped together. */
 303         bind_key(pk, "y", 12);
 304         bind_key(pk, "z", 33);
 305 }
 306
 307 static void
 308 bind_keys_azerty(PianoKeyboard *pk)
 309 {
 310         clear_notes(pk);
 311
 312         bind_key(pk, "space", 128);
 313
 314         /* Lower keyboard row - "wxcvbn,". */
 315         bind_key(pk, "w", 12);  /* C0 */
 316         bind_key(pk, "s", 13);
 317         bind_key(pk, "x", 14);
 318         bind_key(pk, "d", 15);
 319         bind_key(pk, "c", 16);
 320         bind_key(pk, "v", 17);
 321         bind_key(pk, "g", 18);
 322         bind_key(pk, "b", 19);
 323         bind_key(pk, "h", 20);
 324         bind_key(pk, "n", 21);
 325         bind_key(pk, "j", 22);
 326         bind_key(pk, "comma", 23);
 327
 328         /* Upper keyboard row, first octave - "azertyu". */
 329         bind_key(pk, "a", 24);
 330         bind_key(pk, "eacute", 25);
 331         bind_key(pk, "z", 26);
 332         bind_key(pk, "quotedbl", 27);
 333         bind_key(pk, "e", 28);
 334         bind_key(pk, "r", 29);
 335         bind_key(pk, "parenleft", 30);
 336         bind_key(pk, "t", 31);
 337         bind_key(pk, "minus", 32);
 338         bind_key(pk, "y", 33);
 339         bind_key(pk, "egrave", 34);
 340         bind_key(pk, "u", 35);
 341
 342         /* Upper keyboard row, the rest - "iop". */
 343         bind_key(pk, "i", 36);
 344         bind_key(pk, "ccedilla", 37);
 345         bind_key(pk, "o", 38);
 346         bind_key(pk, "agrave", 39);
 347         bind_key(pk, "p", 40);
 348 }
 349
 350 static gint
 351 keyboard_event_handler(GtkWidget *mk, GdkEventKey *event, gpointer notused)
 352 {
 353         int             note;
 354         char            *key;
 355         guint           keyval;
 356         GdkKeymapKey    kk;
 357         PianoKeyboard   *pk = PIANO_KEYBOARD(mk);
 358
 359         /* We're not using event->keyval, because we need keyval with level set to 0.
 360            E.g. if user holds Shift and presses '7', we want to get a '7', not '&'. */
 361         kk.keycode = event->hardware_keycode;
 362         kk.level = 0;
 363         kk.group = 0;
 364
 365         keyval = gdk_keymap_lookup_key(NULL, &kk);
 366
 367         key = gdk_keyval_name(gdk_keyval_to_lower(keyval));
 368
 369         if (key == NULL) {
 370                 g_message("gtk_keyval_name() returned NULL; please report this.");
 371                 return FALSE;
 372         }
 373
 374         note = key_binding(pk, key);
 375
 376         if (note < 0) {
 377                 /* Key was not bound.  Maybe it's one of the keys handled in jack-keyboard.c. */
 378                 return FALSE;
 379         }
 380
 381         if (note == 128) {
 382                 if (event->type == GDK_KEY_RELEASE) {
 383                         rest (pk);
 384                 }
 385
 386                 return TRUE;
 387         }
 388
 389         note += pk->octave * 12;
 390
 391         assert(note >= 0);
 392         assert(note < NNOTES);
 393
 394         if (event->type == GDK_KEY_PRESS) {
 395                 press_key(pk, note);
 396
 397         } else if (event->type == GDK_KEY_RELEASE) {
 398                 release_key(pk, note);
 399         }
 400
 401         return TRUE;
 402 }
 403
 404 static int
 405 get_note_for_xy(PianoKeyboard *pk, int x, int y)
 406 {
 407         int             height = GTK_WIDGET(pk)->allocation.height;
 408         int             note;
 409
 410         if (y <= height / 2) {
 411                 for (note = 0; note < NNOTES - 1; note++) {
 412                         if (pk->notes[note].white)
 413                                 continue;
 414
 415                         if (x >= pk->notes[note].x && x <= pk->notes[note].x + pk->notes[note].w)
 416                                 return note;
 417                 }
 418         }
 419
 420         for (note = 0; note < NNOTES - 1; note++) {
 421                 if (!pk->notes[note].white)
 422                         continue;
 423
 424                 if (x >= pk->notes[note].x && x <= pk->notes[note].x + pk->notes[note].w)
 425                         return note;
 426         }
 427
 428         return -1;
 429 }
 430
 431 static gboolean
 432 mouse_button_event_handler(PianoKeyboard *pk, GdkEventButton *event, gpointer notused)
 433 {
 434         int             x = event->x;
 435         int             y = event->y;
 436
 437         int             note = get_note_for_xy(pk, x, y);
 438
 439         if (event->button != 1)
 440                 return TRUE;
 441
 442         if (event->type == GDK_BUTTON_PRESS) {
 443                 /* This is possible when you make the window a little wider and then click
 444                    on the grey area. */
 445                 if (note < 0) {
 446                         return TRUE;
 447                 }
 448
 449                 if (pk->note_being_pressed_using_mouse >= 0)
 450                         release_key(pk, pk->note_being_pressed_using_mouse);
 451
 452                 press_key(pk, note);
 453                 pk->note_being_pressed_using_mouse = note;
 454
 455         } else if (event->type == GDK_BUTTON_RELEASE) {
 456                 if (note >= 0) {
 457                         release_key(pk, note);
 458
 459                 } else {
 460                         if (pk->note_being_pressed_using_mouse >= 0)
 461                                 release_key(pk, pk->note_being_pressed_using_mouse);
 462                 }
 463
 464                 pk->note_being_pressed_using_mouse = -1;
 465
 466         }
 467
 468         return TRUE;
 469 }
 470
 471 static gboolean
 472 mouse_motion_event_handler(PianoKeyboard *pk, GdkEventMotion *event, gpointer notused)
 473 {
 474         int             note;
 475
 476         if ((event->state & GDK_BUTTON1_MASK) == 0)
 477                 return TRUE;
 478
 479         note = get_note_for_xy(pk, event->x, event->y);
 480
 481         if (note != pk->note_being_pressed_using_mouse && note >= 0) {
 482
 483                 if (pk->note_being_pressed_using_mouse >= 0)
 484                         release_key(pk, pk->note_being_pressed_using_mouse);
 485                 press_key(pk, note);
 486                 pk->note_being_pressed_using_mouse = note;
 487         }
 488
 489         return TRUE;
 490 }
 491
 492 static gboolean
 493 piano_keyboard_expose(GtkWidget *widget, GdkEventExpose *event)
 494 {
 495         int i;
 496         PianoKeyboard *pk = PIANO_KEYBOARD(widget);
 497         cairo_t* cr = gdk_cairo_create (GDK_DRAWABLE (GTK_WIDGET(pk)->window));
 498
 499         gdk_cairo_region (cr, event->region);
 500         cairo_clip (cr);
 501
 502         for (i = 0; i < NNOTES; i++) {
 503                 GdkRectangle r;
 504
 505                 r.x = pk->notes[i].x;
 506                 r.y = 0;
 507                 r.width = pk->notes[i].w;
 508                 r.height = pk->notes[i].h;
 509
 510                 switch (gdk_region_rect_in (event->region, &r)) {
 511                 case GDK_OVERLAP_RECTANGLE_PART:
 512                 case GDK_OVERLAP_RECTANGLE_IN:
 513                         draw_note (pk, cr, i);
 514                         break;
 515                 default:
 516                         break;
 517                 }
 518         }
 519
 520         cairo_destroy (cr);
 521
 522         return TRUE;
 523 }
 524
 525 static void
 526 piano_keyboard_size_request(GtkWidget* widget, GtkRequisition *requisition)
 527 {
 528         requisition->width = PIANO_KEYBOARD_DEFAULT_WIDTH;
 529         requisition->height = PIANO_KEYBOARD_DEFAULT_HEIGHT;
 530 }
 531
 532 static void
 533 recompute_dimensions(PianoKeyboard *pk)
 534 {
 535         int             number_of_white_keys = (NNOTES - 1) * (7.0 / 12.0);
 536
 537         int             key_width;
 538         int             black_key_width;
 539         int             useful_width;
 540
 541         int             note;
 542         int             white_key = 0;
 543         int             note_in_octave;
 544
 545         int             width = GTK_WIDGET(pk)->allocation.width;
 546         int             height = GTK_WIDGET(pk)->allocation.height;
 547
 548         key_width = width / number_of_white_keys;
 549         black_key_width = key_width * 0.8;
 550         useful_width = number_of_white_keys * key_width;
 551         pk->widget_margin = (width - useful_width) / 2;
 552
 553         for (note = 0, white_key = 0; note < NNOTES - 2; note++) {
 554                 note_in_octave = note % 12;
 555
 556                 if (note_in_octave == 1 || note_in_octave == 3 || note_in_octave == 6 ||
 557                         note_in_octave == 8 || note_in_octave == 10) {
 558
 559                         /* This note is black key. */
 560                         pk->notes[note].x = pk->widget_margin + white_key * key_width - black_key_width / 2;
 561                         pk->notes[note].w = black_key_width;
 562                         pk->notes[note].h = height / 2;
 563                         pk->notes[note].white = 0;
 564
 565                         continue;
 566                 }
 567
 568                 /* This note is white key. */
 569                 pk->notes[note].x = pk->widget_margin + white_key * key_width;
 570                 pk->notes[note].w = key_width;
 571                 pk->notes[note].h = height;
 572                 pk->notes[note].white = 1;
 573
 574                 white_key++;
 575         }
 576 }
 577
 578 static void
 579 piano_keyboard_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
 580 {
 581         /* XXX: Are these two needed? */
 582         g_return_if_fail(widget != NULL);
 583         g_return_if_fail(allocation != NULL);
 584
 585         widget->allocation = *allocation;
 586
 587         recompute_dimensions(PIANO_KEYBOARD(widget));
 588
 589         if (GTK_WIDGET_REALIZED(widget)) {
 590                 gdk_window_move_resize (widget->window, allocation->x, allocation->y, allocation->width, allocation->height);
 591         }
 592 }
 593
 594 static void
 595 piano_keyboard_class_init(PianoKeyboardClass *klass)
 596 {
 597         GtkWidgetClass  *widget_klass;
 598
 599         /* Set up signals. */
 600         piano_keyboard_signals[NOTE_ON_SIGNAL] = g_signal_new ("note-on",
 601                 G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
 602                 0, NULL, NULL, g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
 603
 604         piano_keyboard_signals[NOTE_OFF_SIGNAL] = g_signal_new ("note-off",
 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[REST_SIGNAL] = g_signal_new ("rest",
 609                 G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
 610                 0, NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 611
 612         widget_klass = (GtkWidgetClass*) klass;
 613
 614         widget_klass->expose_event = piano_keyboard_expose;
 615         widget_klass->size_request = piano_keyboard_size_request;
 616         widget_klass->size_allocate = piano_keyboard_size_allocate;
 617 }
 618
 619 static void
 620 piano_keyboard_init(GtkWidget *mk)
 621 {
 622         gtk_widget_add_events(mk, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK);
 623
 624         g_signal_connect(G_OBJECT(mk), "button-press-event", G_CALLBACK(mouse_button_event_handler), NULL);
 625         g_signal_connect(G_OBJECT(mk), "button-release-event", G_CALLBACK(mouse_button_event_handler), NULL);
 626         g_signal_connect(G_OBJECT(mk), "motion-notify-event", G_CALLBACK(mouse_motion_event_handler), NULL);
 627         g_signal_connect(G_OBJECT(mk), "key-press-event", G_CALLBACK(keyboard_event_handler), NULL);
 628         g_signal_connect(G_OBJECT(mk), "key-release-event", G_CALLBACK(keyboard_event_handler), NULL);
 629 }
 630
 631 GType
 632 piano_keyboard_get_type(void)
 633 {
 634         static GType mk_type = 0;
 635
 636         if (!mk_type) {
 637                 static const GTypeInfo mk_info = {
 638                         sizeof(PianoKeyboardClass),
 639                         NULL, /* base_init */
 640                         NULL, /* base_finalize */
 641                         (GClassInitFunc) piano_keyboard_class_init,
 642                         NULL, /* class_finalize */
 643                         NULL, /* class_data */
 644                         sizeof (PianoKeyboard),
 645                         0,    /* n_preallocs */
 646                         (GInstanceInitFunc) piano_keyboard_init,
 647                         0,    /* value_table */
 648                 };
 649
 650                 mk_type = g_type_register_static(GTK_TYPE_DRAWING_AREA, "PianoKeyboard", &mk_info, 0);
 651         }
 652
 653         return mk_type;
 654 }
 655
 656 GtkWidget *
 657 piano_keyboard_new(void)
 658 {
 659         GtkWidget *widget = gtk_type_new(piano_keyboard_get_type());
 660
 661         PianoKeyboard *pk = PIANO_KEYBOARD(widget);
 662
 663         pk->maybe_stop_sustained_notes = 0;
 664         pk->sustain_new_notes = 0;
 665         pk->enable_keyboard_cue = 0;
 666         pk->octave = 4;
 667         pk->note_being_pressed_using_mouse = -1;
 668         memset((void *)pk->notes, 0, sizeof(struct Note) * NNOTES);
 669         pk->key_bindings = g_hash_table_new(g_str_hash, g_str_equal);
 670         bind_keys_qwerty(pk);
 671
 672         return widget;
 673 }
 674
 675 void
 676 piano_keyboard_set_keyboard_cue(PianoKeyboard *pk, int enabled)
 677 {
 678         pk->enable_keyboard_cue = enabled;
 679 }
 680
 681 void
 682 piano_keyboard_sustain_press(PianoKeyboard *pk)
 683 {
 684         if (!pk->sustain_new_notes) {
 685                 pk->sustain_new_notes = 1;
 686                 pk->maybe_stop_sustained_notes = 1;
 687         }
 688 }
 689
 690 void
 691 piano_keyboard_sustain_release(PianoKeyboard *pk)
 692 {
 693         if (pk->maybe_stop_sustained_notes)
 694                 stop_sustained_notes(pk);
 695
 696         pk->sustain_new_notes = 0;
 697 }
 698
 699 void
 700 piano_keyboard_set_note_on(PianoKeyboard *pk, int note)
 701 {
 702         if (pk->notes[note].pressed == 0) {
 703                 pk->notes[note].pressed = 1;
 704                 queue_note_draw (pk, note);
 705         }
 706 }
 707
 708 void
 709 piano_keyboard_set_note_off(PianoKeyboard *pk, int note)
 710 {
 711         if (pk->notes[note].pressed || pk->notes[note].sustained) {
 712                 pk->notes[note].pressed = 0;
 713                 pk->notes[note].sustained = 0;
 714                 queue_note_draw (pk, note);
 715         }
 716 }
 717
 718 void
 719 piano_keyboard_set_octave(PianoKeyboard *pk, int octave)
 720 {
 721         stop_unsustained_notes(pk);
 722         pk->octave = octave;
 723         gtk_widget_queue_draw(GTK_WIDGET(pk));
 724 }
 725
 726 gboolean
 727 piano_keyboard_set_keyboard_layout(PianoKeyboard *pk, const char *layout)
 728 {
 729         assert(layout);
 730
 731         if (!strcasecmp(layout, "QWERTY")) {
 732                 bind_keys_qwerty(pk);
 733
 734         } else if (!strcasecmp(layout, "QWERTZ")) {
 735                 bind_keys_qwertz(pk);
 736
 737         } else if (!strcasecmp(layout, "AZERTY")) {
 738                 bind_keys_azerty(pk);
 739
 740         } else {
 741                 /* Unknown layout name. */
 742                 return TRUE;
 743         }
 744
 745         return FALSE;
 746 }
 747