mdw@git.distorted.org.uk Git - disorder/blob - disobedience/control.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2006-2009 Richard Kettlewell
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 /** @file disobedience/control.c
  19  * @brief Volume control and buttons
  20  */
  21
  22 #include "disobedience.h"
  23
  24 /* Forward declarations ---------------------------------------------------- */
  25
  26 struct icon;
  27
  28 static void clicked_icon(GtkToolButton *, gpointer);
  29 static void toggled_icon(GtkToggleToolButton *button,
  30                          gpointer user_data);
  31 static void clicked_menu(GtkMenuItem *, gpointer userdata);
  32 static void toggled_menu(GtkCheckMenuItem *, gpointer userdata);
  33
  34 static int enable_playing(disorder_eclient *c,
  35                           disorder_eclient_no_response *completed,
  36                           void *v);
  37 static int disable_playing(disorder_eclient *c,
  38                            disorder_eclient_no_response *completed,
  39                            void *v);
  40 static int enable_random(disorder_eclient *c,
  41                          disorder_eclient_no_response *completed,
  42                          void *v);
  43 static int disable_random(disorder_eclient *c,
  44                           disorder_eclient_no_response *completed,
  45                           void *v);
  46 static int pause_track(disorder_eclient *c,
  47                        disorder_eclient_no_response *completed,
  48                        void *v);
  49 static int resume_track(disorder_eclient *c,
  50                         disorder_eclient_no_response *completed,
  51                         void *v);
  52 static int enable_rtp(disorder_eclient *c,
  53                       disorder_eclient_no_response *completed,
  54                       void *v);
  55 static int disable_rtp(disorder_eclient *c,
  56                        disorder_eclient_no_response *completed,
  57                        void *v);
  58
  59 static double left(double v, double b);
  60 static double right(double v, double b);
  61 static double volume(double l, double r);
  62 static double balance(double l, double r);
  63
  64 static void volume_adjusted(GtkAdjustment *a, gpointer user_data);
  65 static gchar *format_volume(GtkScale *scale, gdouble value);
  66 static gchar *format_balance(GtkScale *scale, gdouble value);
  67
  68 static void icon_changed(const char *event,
  69                          void *evendata,
  70                          void *callbackdata);
  71 static void volume_changed(const char *event,
  72                            void *eventdata,
  73                            void *callbackdata);
  74 static void control_minimode(const char *event,
  75                              void *eventdata,
  76                              void *callbackdata);
  77
  78 /* Control bar ------------------------------------------------------------- */
  79
  80 /** @brief Guard against feedback */
  81 int suppress_actions = 1;
  82
  83 /** @brief Toolbar widget */
  84 static GtkWidget *toolbar;
  85
  86 /** @brief Old state to restore on error
  87  *
  88  * Here's the problem we're trying to solve.  Suppose the user clicks the
  89  * `pause' button.  Immediately, Gtk toggles the button's state.  There's also
  90  * a menu item which is @i not yet updated, so we hack @c last_state and call
  91  * icon_changed() by hand.  We send a `pause' command to the server.  If all is
  92  * well, then we're done: we'll get a state update in the server log which will
  93  * match what we're already doing and everything is fine.  If there's an error,
  94  * though, we must put @c last_state back the way we found it since there will
  95  * be no change reported in the server log to correct the wrong state
  96  * information.  Also, we must untoggle the icon and menu items.
  97  */
  98 static unsigned long restore_state;
  99
 100 /** @brief Definition of an icon
 101  *
 102  * We have two kinds of icon:
 103  * - action icons, which just do something but don't have a state as such
 104  * - toggle icons, which toggle between two states ("on" and "off").
 105  *
 106  * The scratch button is an action icon; currently all the others are toggle
 107  * icons.
 108  *
 109  * (All icons can be sensitive or insensitive, separately to the above.)
 110  */
 111 struct icon {
 112   /** @brief TRUE to use GTK+ stock icons instead of filenames */
 113   gboolean stock;
 114
 115   /** @brief TRUE for toggle buttons, FALSE for action buttons */
 116   gboolean toggle;
 117
 118   /** @brief Filename for image or stock string */
 119   const char *icon;
 120
 121   /** @brief Text for 'on' tooltip */
 122   const char *tip_on;
 123
 124   /** @brief Text for 'off' tooltip */
 125   const char *tip_off;
 126
 127   /** @brief Associated menu item or NULL */
 128   const char *menuitem;
 129
 130   /** @brief Label text */
 131   const char *label;
 132
 133   /** @brief Events that change this icon, separated by spaces */
 134   const char *events;
 135
 136   /** @brief @ref eclient.h function to call to go from off to on
 137    *
 138    * For action buttons, this should be NULL.
 139    */
 140   int (*action_go_on)(disorder_eclient *c,
 141                       disorder_eclient_no_response *completed,
 142                       void *v);
 143
 144   /** @brief @ref eclient.h function to call to go from on to off
 145    *
 146    * For action buttons, this action is used.
 147    */
 148   int (*action_go_off)(disorder_eclient *c,
 149                        disorder_eclient_no_response *completed,
 150                        void *v);
 151
 152   /** @brief Get button state
 153    * @return 1 for on, 0 for off
 154    */
 155   int (*on)(void);
 156
 157   /** @brief Get button sensitivity
 158    * @return 1 for sensitive, 0 for insensitive
 159    *
 160    * Can be NULL for always sensitive.
 161    */
 162   int (*sensitive)(void);
 163
 164   /** @brief True if the menu item has inverse sense to the button */
 165   gboolean menu_invert;
 166
 167   /** @brief Pointer to button */
 168   GtkWidget *button;
 169
 170   /** @brief Pointer to menu item */
 171   GtkWidget *item;
 172
 173   GtkWidget *image;
 174 };
 175
 176 static int pause_resume_on(void) {
 177   return !!(last_state & DISORDER_TRACK_PAUSED);
 178 }
 179
 180 static int pause_resume_sensitive(void) {
 181   return playing_track
 182     && !!(last_state & DISORDER_PLAYING)
 183     && (last_rights & RIGHT_PAUSE);
 184 }
 185
 186 static int scratch_sensitive(void) {
 187   return !!(last_state & DISORDER_PLAYING)
 188     && right_scratchable(last_rights, config->username, playing_track);
 189 }
 190
 191 static int random_sensitive(void) {
 192   return !!(last_rights & RIGHT_GLOBAL_PREFS);
 193 }
 194
 195 static int random_enabled(void) {
 196   return !!(last_state & DISORDER_RANDOM_ENABLED);
 197 }
 198
 199 static int playing_sensitive(void) {
 200   return !!(last_rights & RIGHT_GLOBAL_PREFS);
 201 }
 202
 203 static int playing_enabled(void) {
 204   return !!(last_state & DISORDER_PLAYING_ENABLED);
 205 }
 206
 207 static int rtp_enabled(void) {
 208   return rtp_is_running;
 209 }
 210
 211 static int rtp_sensitive(void) {
 212   return rtp_supported;
 213 }
 214
 215 /** @brief Table of all icons */
 216 static struct icon icons[] = {
 217   {
 218     .toggle = TRUE,
 219     .stock = TRUE,
 220     .icon = GTK_STOCK_MEDIA_PAUSE,
 221     .label = "Pause",
 222     .tip_on = "Resume playing track",
 223     .tip_off = "Pause playing track",
 224     .menuitem = "<GdisorderMain>/Control/Playing",
 225     .on = pause_resume_on,
 226     .sensitive = pause_resume_sensitive,
 227     .action_go_on = pause_track,
 228     .action_go_off = resume_track,
 229     .events = "pause-changed playing-changed rights-changed playing-track-changed",
 230     .menu_invert = TRUE,
 231   },
 232   {
 233     .stock = TRUE,
 234     .icon = GTK_STOCK_STOP,
 235     .label = "Scratch",
 236     .tip_on = "Cancel playing track",
 237     .menuitem = "<GdisorderMain>/Control/Scratch",
 238     .sensitive = scratch_sensitive,
 239     .action_go_off = disorder_eclient_scratch_playing,
 240     .events = "playing-track-changed rights-changed",
 241   },
 242   {
 243     .toggle = TRUE,
 244     .stock = FALSE,
 245     .icon = "cards24.png",
 246     .label = "Random",
 247     .tip_on = "Disable random play",
 248     .tip_off = "Enable random play",
 249     .menuitem = "<GdisorderMain>/Control/Random play",
 250     .on = random_enabled,
 251     .sensitive = random_sensitive,
 252     .action_go_on = enable_random,
 253     .action_go_off = disable_random,
 254     .events = "random-changed rights-changed",
 255   },
 256   {
 257     .toggle = TRUE,
 258     .stock = TRUE,
 259     .icon = GTK_STOCK_MEDIA_PLAY,
 260     .label = "Play",
 261     .tip_on = "Disable play",
 262     .tip_off = "Enable play",
 263     .on = playing_enabled,
 264     .sensitive = playing_sensitive,
 265     .action_go_on = enable_playing,
 266     .action_go_off = disable_playing,
 267     .events = "enabled-changed rights-changed",
 268   },
 269   {
 270     .toggle = TRUE,
 271     .stock = TRUE,
 272     .icon = GTK_STOCK_CONNECT,
 273     .label = "RTP",
 274     .tip_on = "Stop playing network stream",
 275     .tip_off = "Play network stream",
 276     .menuitem = "<GdisorderMain>/Control/Network player",
 277     .on = rtp_enabled,
 278     .sensitive = rtp_sensitive,
 279     .action_go_on = enable_rtp,
 280     .action_go_off = disable_rtp,
 281     .events = "rtp-changed",
 282   },
 283 };
 284
 285 /** @brief Count of icons */
 286 #define NICONS (int)(sizeof icons / sizeof *icons)
 287
 288 static GtkAdjustment *volume_adj;
 289 static GtkAdjustment *balance_adj;
 290 static GtkWidget *volume_widget;
 291 static GtkWidget *balance_widget;
 292
 293 /** @brief Create the control bar */
 294 GtkWidget *control_widget(void) {
 295   GtkWidget *hbox = gtk_hbox_new(FALSE, 1);
 296   int n;
 297
 298   D(("control_widget"));
 299   assert(mainmenufactory);              /* ordering must be right */
 300   toolbar = gtk_toolbar_new();
 301   /* Don't permit overflow arrow as otherwise the toolbar isn't greedy enough
 302    * in asking for space.  The ideal is probably to make the volume and balance
 303    * sliders hang down from the toolbar so it unavoidably gets the whole width
 304    * of the window to play with. */
 305   gtk_toolbar_set_show_arrow(GTK_TOOLBAR(toolbar), FALSE);
 306   if(full_mode) gtk_toolbar_unset_style(GTK_TOOLBAR(toolbar));
 307   else gtk_toolbar_set_style(GTK_TOOLBAR(toolbar), GTK_TOOLBAR_ICONS);
 308   for(n = 0; n < NICONS; ++n) {
 309     struct icon *const icon = &icons[n];
 310     icon->button = (icon->toggle
 311                     ? GTK_WIDGET(gtk_toggle_tool_button_new())
 312                     : GTK_WIDGET(gtk_tool_button_new(NULL, NULL)));
 313     gtk_widget_set_style(icons[n].button, tool_style);
 314     if(icons[n].stock) {
 315       /* We'll use the stock icons for this one */
 316       icon->image = gtk_image_new_from_stock(icons[n].icon,
 317                                              GTK_ICON_SIZE_LARGE_TOOLBAR);
 318     } else {
 319       /* Create the 'on' image */
 320       icon->image = gtk_image_new_from_pixbuf(find_image(icons[n].icon));
 321     }
 322     assert(icon->image);
 323     gtk_tool_button_set_icon_widget(GTK_TOOL_BUTTON(icon->button),
 324                                     icon->image);
 325     gtk_tool_button_set_label(GTK_TOOL_BUTTON(icon->button),
 326                                     icon->label);
 327     if(icon->toggle)
 328       g_signal_connect(G_OBJECT(icon->button), "toggled",
 329                        G_CALLBACK(toggled_icon), icon);
 330     else
 331       g_signal_connect(G_OBJECT(icon->button), "clicked",
 332                        G_CALLBACK(clicked_icon), icon);
 333     gtk_toolbar_insert(GTK_TOOLBAR(toolbar),
 334                        GTK_TOOL_ITEM(icon->button),
 335                        -1);
 336     if(icons[n].menuitem) {
 337       /* Find the menu item */
 338       icons[n].item = gtk_item_factory_get_widget(mainmenufactory,
 339                                                   icons[n].menuitem);
 340       if(icon->toggle)
 341         g_signal_connect(G_OBJECT(icons[n].item), "toggled",
 342                          G_CALLBACK(toggled_menu), &icons[n]);
 343       else
 344         g_signal_connect(G_OBJECT(icons[n].item), "activate",
 345                          G_CALLBACK(clicked_menu), &icons[n]);
 346     }
 347     /* Make sure the icon is updated when relevant things changed */
 348     char **events = split(icons[n].events, 0, 0, 0, 0);
 349     while(*events)
 350       event_register(*events++, icon_changed, &icons[n]);
 351     event_register("connected-changed", icon_changed, &icons[n]);
 352   }
 353   /* create the adjustments for the volume control */
 354   volume_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, goesupto,
 355                                                  goesupto / 20, goesupto / 20,
 356                                                  0));
 357   balance_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, -1, 1,
 358                                                   0.2, 0.2, 0));
 359   /* the volume control */
 360   volume_widget = gtk_hscale_new(volume_adj);
 361   balance_widget = gtk_hscale_new(balance_adj);
 362   gtk_widget_set_style(volume_widget, tool_style);
 363   gtk_widget_set_style(balance_widget, tool_style);
 364   gtk_scale_set_digits(GTK_SCALE(volume_widget), 10);
 365   gtk_scale_set_digits(GTK_SCALE(balance_widget), 10);
 366   gtk_widget_set_size_request(volume_widget, 128, -1);
 367   gtk_widget_set_size_request(balance_widget, 128, -1);
 368   gtk_widget_set_tooltip_text(volume_widget, "Volume");
 369   gtk_widget_set_tooltip_text(balance_widget, "Balance");
 370   gtk_box_pack_start(GTK_BOX(hbox), toolbar,
 371                      FALSE/*expand*/, TRUE/*fill*/, 0);
 372   gtk_box_pack_start(GTK_BOX(hbox), volume_widget,
 373                      FALSE/*expand*/, TRUE/*fill*/, 0);
 374   gtk_box_pack_start(GTK_BOX(hbox), balance_widget,
 375                      FALSE/*expand*/, TRUE/*fill*/, 0);
 376   /* space updates rather than hammering the server */
 377   gtk_range_set_update_policy(GTK_RANGE(volume_widget), GTK_UPDATE_DELAYED);
 378   gtk_range_set_update_policy(GTK_RANGE(balance_widget), GTK_UPDATE_DELAYED);
 379   /* notice when the adjustments are changed */
 380   g_signal_connect(G_OBJECT(volume_adj), "value-changed",
 381                    G_CALLBACK(volume_adjusted), 0);
 382   g_signal_connect(G_OBJECT(balance_adj), "value-changed",
 383                    G_CALLBACK(volume_adjusted), 0);
 384   /* format the volume/balance values ourselves */
 385   g_signal_connect(G_OBJECT(volume_widget), "format-value",
 386                    G_CALLBACK(format_volume), 0);
 387   g_signal_connect(G_OBJECT(balance_widget), "format-value",
 388                    G_CALLBACK(format_balance), 0);
 389   event_register("volume-changed", volume_changed, 0);
 390   event_register("rtp-changed", volume_changed, 0);
 391   event_register("mini-mode-changed", control_minimode, 0);
 392   return hbox;
 393 }
 394
 395 /** @brief Return TRUE if volume setting is supported */
 396 static int volume_supported(void) {
 397   /* TODO: if the server doesn't know how to set the volume [but isn't using
 398    * network play] then we should have volume_supported = FALSE */
 399   return 1;
 400 }
 401
 402 /** @brief Update the volume control when it changes */
 403 static void volume_changed(const char attribute((unused)) *event,
 404                            void attribute((unused)) *eventdata,
 405                            void attribute((unused)) *callbackdata) {
 406   double l, r;
 407
 408   D(("volume_changed"));
 409   ++suppress_actions;
 410   /* Only display volume/balance controls if they will work */
 411   if(volume_supported()) {
 412     gtk_widget_show(volume_widget);
 413     if(full_mode)
 414       gtk_widget_show(balance_widget);
 415     l = volume_l / 100.0;
 416     r = volume_r / 100.0;
 417     gtk_adjustment_set_value(volume_adj, volume(l, r) * goesupto);
 418     gtk_adjustment_set_value(balance_adj, balance(l, r));
 419   } else {
 420     gtk_widget_hide(volume_widget);
 421     gtk_widget_hide(balance_widget);
 422   }
 423   --suppress_actions;
 424 }
 425
 426 /** @brief Update the state of one of the control icons
 427  */
 428 static void icon_changed(const char attribute((unused)) *event,
 429                          void attribute((unused)) *evendata,
 430                          void *callbackdata) {
 431   //fprintf(stderr, "icon_changed (%s)\n", event);
 432   const struct icon *const icon = callbackdata;
 433   int on = icon->on ? icon->on() : 1;
 434   int sensitive = icon->sensitive ? icon->sensitive() : 1;
 435   //fprintf(stderr, "sensitive->%d\n", sensitive);
 436
 437   ++suppress_actions;
 438   /* If the connection is down nothing is ever usable */
 439   if(!(last_state & DISORDER_CONNECTED))
 440     sensitive = 0;
 441   if(icon->toggle)
 442     gtk_toggle_tool_button_set_active(GTK_TOGGLE_TOOL_BUTTON(icon->button),
 443                                       on);
 444   /* If you disable play or random play NOT via the icon (for instance, via the
 445    * edit menu or via a completely separate command line invocation) then the
 446    * icon shows up as insensitive.  Hover the mouse over it and the correct
 447    * state is immediately displayed.  sensitive and GTK_WIDGET_SENSITIVE show
 448    * it to be in the correct state, so I think this is may be a GTK+ bug. */
 449   if(icon->tip_on)
 450     gtk_widget_set_tooltip_text(icon->button,
 451                                 on ? icon->tip_on : icon->tip_off);
 452   gtk_widget_set_sensitive(icon->button, sensitive);
 453   /* Icons with an associated menu item */
 454   if(icon->item) {
 455     if(icon->toggle)
 456       gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(icon->item),
 457                                      !!icon->menu_invert ^ !!on);
 458     gtk_widget_set_sensitive(icon->item, sensitive);
 459   }
 460   --suppress_actions;
 461 }
 462
 463 static void icon_action_completed(void *v, const char *err) {
 464   if(err) {
 465     last_state = restore_state;
 466     popup_protocol_error(0, err);
 467     icon_changed(0, 0, v);
 468   }
 469 }
 470
 471 static void clicked_icon(GtkToolButton attribute((unused)) *button,
 472                          gpointer userdata) {
 473   const struct icon *icon = userdata;
 474
 475   if(suppress_actions)
 476     return;
 477   icon->action_go_off(client, icon_action_completed, 0);
 478 }
 479
 480 static void toggled_icon(GtkToggleToolButton attribute((unused)) *button,
 481                          gpointer user_data) {
 482   const struct icon *icon = user_data;
 483
 484   if(suppress_actions)
 485     return;
 486   restore_state = last_state;
 487   if(icon->on())
 488     icon->action_go_off(client, icon_action_completed, 0);
 489   else
 490     icon->action_go_on(client, icon_action_completed, 0);
 491   icon_changed(0, 0, user_data);
 492 }
 493
 494 static void clicked_menu(GtkMenuItem attribute((unused)) *menuitem,
 495                          gpointer userdata) {
 496   clicked_icon(NULL, userdata);
 497 }
 498
 499 static void toggled_menu(GtkCheckMenuItem attribute((unused)) *menuitem,
 500                          gpointer userdata) {
 501   toggled_icon(NULL, userdata);
 502 }
 503
 504 /** @brief Called when a volume command completes */
 505 static void volume_completed(void attribute((unused)) *v,
 506                              const char *err) {
 507   if(err)
 508     popup_protocol_error(0, err);
 509   /* We don't set the UI's notion of the volume here, it is set from the log
 510    * regardless of the reason it changed */
 511 }
 512
 513 /** @brief Called when the volume has been adjusted */
 514 static void volume_adjusted(GtkAdjustment attribute((unused)) *a,
 515                             gpointer attribute((unused)) user_data) {
 516   double v = gtk_adjustment_get_value(volume_adj) / goesupto;
 517   double b = gtk_adjustment_get_value(balance_adj);
 518
 519   if(suppress_actions)
 520     /* This is the result of an update from the server, not a change from the
 521      * user.  Don't feedback! */
 522     return;
 523   D(("volume_adjusted"));
 524   /* force to 'stereotypical' values */
 525   v = nearbyint(100 * v) / 100;
 526   b = nearbyint(5 * b) / 5;
 527   /* Set the volume.  We don't want a reply, we'll get the actual new volume
 528    * from the log. */
 529   if(rtp_supported) {
 530     int l = nearbyint(left(v, b) * 100), r = nearbyint(right(v, b) * 100);
 531     rtp_setvol(&l, &r);
 532   } else
 533     disorder_eclient_set_volume(client, volume_completed,
 534                                 nearbyint(left(v, b) * 100),
 535                                 nearbyint(right(v, b) * 100),
 536                                 0);
 537 }
 538
 539 /** @brief Formats the volume value */
 540 static gchar *format_volume(GtkScale attribute((unused)) *scale,
 541                             gdouble value) {
 542   char s[32];
 543
 544   snprintf(s, sizeof s, "%.1f", (double)value);
 545   return g_strdup(s);
 546 }
 547
 548 /** @brief Formats the balance value */
 549 static gchar *format_balance(GtkScale attribute((unused)) *scale,
 550                              gdouble value) {
 551   char s[32];
 552
 553   if(fabs(value) < 0.1)
 554     return g_strdup("0");
 555   snprintf(s, sizeof s, "%+.1f", (double)value);
 556   return g_strdup(s);
 557 }
 558
 559 /* Volume mapping.  We consider left, right, volume to be in [0,1]
 560  * and balance to be in [-1,1].
 561  *
 562  * First, we just have volume = max(left, right).
 563  *
 564  * Balance we consider to linearly represent the amount by which the quieter
 565  * channel differs from the louder.  In detail:
 566  *
 567  *  if right > left then balance > 0:
 568  *   balance = 0 => left = right  (as an endpoint, not an instance)
 569  *   balance = 1 => left = 0
 570  *   fitting to linear, left = right * (1 - balance)
 571  *                so balance = 1 - left / right
 572  *   (right > left => right > 0 so no division by 0.)
 573  *
 574  *  if left > right then balance < 0:
 575  *   balance = 0 => right = left  (same caveat as above)
 576  *   balance = -1 => right = 0
 577  *   again fitting to linear, right = left * (1 + balance)
 578  *                       so balance = right / left - 1
 579  *   (left > right => left > 0 so no division by 0.)
 580  *
 581  *  if left = right then we just have balance = 0.
 582  *
 583  * Thanks to Clive and Andrew.
 584  */
 585
 586 /** @brief Return the greater of @p x and @p y */
 587 static double max(double x, double y) {
 588   return x > y ? x : y;
 589 }
 590
 591 /** @brief Compute the left channel volume */
 592 static double left(double v, double b) {
 593   if(b > 0)                             /* volume = right */
 594     return v * (1 - b);
 595   else                                  /* volume = left */
 596     return v;
 597 }
 598
 599 /** @brief Compute the right channel volume */
 600 static double right(double v, double b) {
 601   if(b > 0)                             /* volume = right */
 602     return v;
 603   else                                  /* volume = left */
 604     return v * (1 + b);
 605 }
 606
 607 /** @brief Compute the overall volume */
 608 static double volume(double l, double r) {
 609   return max(l, r);
 610 }
 611
 612 /** @brief Compute the balance */
 613 static double balance(double l, double r) {
 614   if(l > r)
 615     return r / l - 1;
 616   else if(r > l)
 617     return 1 - l / r;
 618   else                                  /* left = right */
 619     return 0;
 620 }
 621
 622 /** @brief Called to enable jukebox playback */
 623 static int enable_playing(disorder_eclient *c,
 624                           disorder_eclient_no_response *completed, void *v) {
 625   last_state |= DISORDER_PLAYING;
 626   return disorder_eclient_enable(c, completed, v);
 627 }
 628
 629 /** @brief Called to disable jukebox playback */
 630 static int disable_playing(disorder_eclient *c,
 631                            disorder_eclient_no_response *completed, void *v) {
 632   last_state &= ~DISORDER_PLAYING;
 633   return disorder_eclient_disable(c, completed, v);
 634 }
 635
 636 /** @brief Called to enable random selection */
 637 static int enable_random(disorder_eclient *c,
 638                          disorder_eclient_no_response *completed, void *v) {
 639   last_state |= DISORDER_RANDOM_ENABLED;
 640   return disorder_eclient_random_enable(c, completed, v);
 641 }
 642
 643 /** @brief Called to disable random selection */
 644 static int disable_random(disorder_eclient *c,
 645                           disorder_eclient_no_response *completed, void *v) {
 646   last_state &= ~DISORDER_RANDOM_ENABLED;
 647   return disorder_eclient_random_disable(c, completed, v);
 648 }
 649
 650 /** @brief Called to pause the current track */
 651 static int pause_track(disorder_eclient *c,
 652                        disorder_eclient_no_response *completed, void *v) {
 653   last_state |= DISORDER_TRACK_PAUSED;
 654   return disorder_eclient_pause(c, completed, v);
 655 }
 656
 657 /** @brief Called to resume the current track */
 658 static int resume_track(disorder_eclient *c,
 659                         disorder_eclient_no_response *completed, void *v) {
 660   last_state &= ~DISORDER_TRACK_PAUSED;
 661   return disorder_eclient_resume(c, completed, v);
 662 }
 663
 664 /** @brief Called to enable RTP play
 665  *
 666  * Rather odd signature is to fit in with the other icons which all call @ref
 667  * lib/eclient.h functions.
 668  */
 669 static int enable_rtp(disorder_eclient attribute((unused)) *c,
 670                       disorder_eclient_no_response attribute((unused)) *completed,
 671                       void attribute((unused)) *v) {
 672   start_rtp();
 673   rtp_is_running = 1;
 674   return 0;
 675 }
 676
 677 /** @brief Called to disable RTP play
 678  *
 679  * Rather odd signature is to fit in with the other icons which all call @ref
 680  * lib/eclient.h functions.
 681  */
 682 static int disable_rtp(disorder_eclient attribute((unused)) *c,
 683                        disorder_eclient_no_response attribute((unused)) *completed,
 684                        void attribute((unused)) *v) {
 685   stop_rtp();
 686   rtp_is_running = 0;
 687   return 0;
 688 }
 689
 690 static void control_minimode(const char attribute((unused)) *event,
 691                              void attribute((unused)) *evendata,
 692                              void attribute((unused)) *callbackdata) {
 693   if(full_mode && volume_supported()) {
 694     gtk_widget_show(balance_widget);
 695     gtk_scale_set_value_pos(GTK_SCALE(volume_widget), GTK_POS_TOP);
 696   } else {
 697     gtk_widget_hide(balance_widget);
 698     gtk_scale_set_value_pos(GTK_SCALE(volume_widget), GTK_POS_RIGHT);
 699   }
 700   if(full_mode) gtk_toolbar_unset_style(GTK_TOOLBAR(toolbar));
 701   else gtk_toolbar_set_style(GTK_TOOLBAR(toolbar), GTK_TOOLBAR_ICONS);
 702 }
 703
 704 /*
 705 Local Variables:
 706 c-basic-offset:2
 707 comment-column:40
 708 fill-column:79
 709 indent-tabs-mode:nil
 710 End:
 711 */