widgets/bacon-volume.c

   1 /* Volume Button / popup widget
   2  * (c) copyright 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #define _GNU_SOURCE
  25 #include <math.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <glib/gi18n.h>
  29 #include <gtk/gtk.h>
  30 #include <gdk/gdkkeysyms.h>
  31 #include "bacon-volume.h"
  32
  33 #define SCALE_SIZE 100
  34 #define CLICK_TIMEOUT 250
  35
  36 enum {
  37   SIGNAL_VALUE_CHANGED,
  38   NUM_SIGNALS
  39 };
  40
  41 static void     bacon_volume_button_class_init  (BaconVolumeButtonClass * klass);
  42 static void     bacon_volume_button_init        (BaconVolumeButton * button);
  43 static void     bacon_volume_button_dispose     (GObject        * object);
  44
  45 static gboolean bacon_volume_button_scroll      (GtkWidget      * widget,
  46                                                  GdkEventScroll * event);
  47 static gboolean bacon_volume_button_press       (GtkWidget      * widget,
  48                                                  GdkEventButton * event);
  49 static gboolean bacon_volume_key_release        (GtkWidget      * widget,
  50                                                  GdkEventKey    * event);
  51 static void bacon_volume_button_style_set       (GtkWidget *widget,
  52                                                  GtkStyle *previous_style);
  53 static gboolean cb_dock_button_press            (GtkWidget      * widget,
  54                                                  GdkEventButton * event,
  55                                                  gpointer         data);
  56 static gboolean cb_dock_key_release             (GtkWidget      * widget,
  57                                                  GdkEventKey    * event,
  58                                                  gpointer         data);
  59 static gboolean cb_dock_key_press               (GtkWidget      * widget,
  60                                                  GdkEventKey    * event,
  61                                                  gpointer         data);
  62
  63 static gboolean cb_button_press                 (GtkWidget      * widget,
  64                                                  GdkEventButton * event,
  65                                                  gpointer         data);
  66 static gboolean cb_button_release               (GtkWidget      * widget,
  67                                                  GdkEventButton * event,
  68                                                  gpointer         data);
  69 static void     bacon_volume_button_update_icon (BaconVolumeButton *button);
  70 static void     bacon_volume_scale_value_changed(GtkRange       * range);
  71 static void     bacon_volume_button_load_icons  (GtkWidget      * widget);
  72
  73 /* see below for scale definitions */
  74 static GtkWidget *bacon_volume_scale_new        (BaconVolumeButton * button,
  75                                                  float min, float max,
  76                                                  float step);
  77
  78 static GtkButtonClass *parent_class = NULL;
  79 static guint signals[NUM_SIGNALS] = { 0 };
  80
  81 GType
  82 bacon_volume_button_get_type (void)
  83 {
  84   static GType bacon_volume_button_type = 0;
  85
  86   if (G_UNLIKELY (bacon_volume_button_type == 0)) {
  87     const GTypeInfo bacon_volume_button_info = {
  88       sizeof (BaconVolumeButtonClass),
  89       NULL,
  90       NULL,
  91       (GClassInitFunc) bacon_volume_button_class_init,
  92       NULL,
  93       NULL,
  94       sizeof (BaconVolumeButton),
  95       0,
  96       (GInstanceInitFunc) bacon_volume_button_init,
  97       NULL
  98     };
  99
 100     bacon_volume_button_type =
 101         g_type_register_static (GTK_TYPE_BUTTON,
 102                                 "BaconVolumeButton",
 103                                 &bacon_volume_button_info, 0);
 104   }
 105
 106   return bacon_volume_button_type;
 107 }
 108
 109 static void
 110 bacon_volume_button_class_init (BaconVolumeButtonClass *klass)
 111 {
 112   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 113   GtkWidgetClass *gtkwidget_class = GTK_WIDGET_CLASS (klass);
 114
 115   parent_class = g_type_class_peek_parent (klass);
 116
 117   /* events */
 118   gobject_class->dispose = bacon_volume_button_dispose;
 119   gtkwidget_class->button_press_event = bacon_volume_button_press;
 120   gtkwidget_class->key_release_event = bacon_volume_key_release;
 121   gtkwidget_class->scroll_event = bacon_volume_button_scroll;
 122   gtkwidget_class->style_set = bacon_volume_button_style_set;
 123
 124   /* signals */
 125   signals[SIGNAL_VALUE_CHANGED] = g_signal_new ("value-changed",
 126       G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
 127       G_STRUCT_OFFSET (BaconVolumeButtonClass, value_changed),
 128       NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 129 }
 130
 131 static void
 132 bacon_volume_button_init (BaconVolumeButton *button)
 133 {
 134   button->timeout = FALSE;
 135   button->click_id = 0;
 136   button->dock = button->scale = NULL;
 137 }
 138
 139 static void
 140 bacon_volume_button_dispose (GObject *object)
 141 {
 142   BaconVolumeButton *button = BACON_VOLUME_BUTTON (object);
 143   guint i;
 144
 145   if (button->dock) {
 146     gtk_widget_destroy (button->dock);
 147     button->dock = NULL;
 148   }
 149
 150   if (button->click_id != 0) {
 151     g_source_remove (button->click_id);
 152     button->click_id = 0;
 153   }
 154   for (i = 0; i < 4; i++) {
 155     if (button->icon[i] != NULL) {
 156       g_object_unref (button->icon[i]);
 157       button->icon[i] = NULL;
 158     }
 159   }
 160
 161   G_OBJECT_CLASS (parent_class)->dispose (object);
 162 }
 163
 164 /*
 165  * public API.
 166  */
 167
 168 GtkWidget *
 169 bacon_volume_button_new (GtkIconSize size,
 170                          float min, float max,
 171                          float step)
 172 {
 173   BaconVolumeButton *button;
 174   GtkWidget *frame, *box;
 175
 176   button = g_object_new (BACON_TYPE_VOLUME_BUTTON, NULL);
 177   atk_object_set_name (gtk_widget_get_accessible (GTK_WIDGET (button)),
 178                        _("Volume"));
 179   button->size = size;
 180   gtk_button_set_relief (GTK_BUTTON (button), GTK_RELIEF_NONE);
 181   gtk_button_set_focus_on_click (GTK_BUTTON (button), FALSE);
 182
 183   /* image */
 184   button->image = gtk_image_new ();
 185   gtk_container_add (GTK_CONTAINER (button), button->image);
 186   gtk_widget_show_all (button->image);
 187
 188   /* window */
 189   button->dock = gtk_window_new (GTK_WINDOW_POPUP);
 190   g_signal_connect (button->dock, "button-press-event",
 191                     G_CALLBACK (cb_dock_button_press), button);
 192   g_signal_connect (button->dock, "key-release-event",
 193                     G_CALLBACK (cb_dock_key_release), button);
 194   g_signal_connect (button->dock, "key-press-event",
 195                     G_CALLBACK (cb_dock_key_press), button);
 196   gtk_window_set_decorated (GTK_WINDOW (button->dock), FALSE);
 197
 198   /* frame */
 199   frame = gtk_frame_new (NULL);
 200   gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_OUT);
 201   gtk_container_add (GTK_CONTAINER (button->dock), frame);
 202   box = gtk_vbox_new (FALSE, 0);
 203   gtk_container_add (GTK_CONTAINER (frame), box);
 204
 205   /* + */
 206   button->plus = gtk_button_new_with_label (_("+"));
 207   atk_object_set_name (gtk_widget_get_accessible (button->plus),
 208                        _("Volume Down"));
 209   gtk_button_set_relief (GTK_BUTTON (button->plus), GTK_RELIEF_NONE);
 210   g_signal_connect (button->plus, "button-press-event",
 211                     G_CALLBACK (cb_button_press), button);
 212   g_signal_connect (button->plus, "button-release-event",
 213                     G_CALLBACK (cb_button_release), button);
 214   gtk_box_pack_start (GTK_BOX (box), button->plus, TRUE, FALSE, 0);
 215
 216   /* scale */
 217   button->scale = bacon_volume_scale_new (button, min, max, step);
 218   gtk_widget_set_size_request (button->scale, -1, SCALE_SIZE);
 219   gtk_scale_set_draw_value (GTK_SCALE (button->scale), FALSE);
 220   gtk_range_set_inverted (GTK_RANGE (button->scale), TRUE);
 221   gtk_box_pack_start (GTK_BOX (box), button->scale, TRUE, FALSE, 0);
 222
 223   /* - */
 224   button->min = gtk_button_new_with_label (_("-"));
 225   atk_object_set_name (gtk_widget_get_accessible (button->min),
 226                        _("Volume Up"));
 227   gtk_button_set_relief (GTK_BUTTON (button->min), GTK_RELIEF_NONE);
 228   g_signal_connect (button->min, "button-press-event",
 229                    G_CALLBACK (cb_button_press), button);
 230   g_signal_connect (button->min, "button-release-event",
 231                     G_CALLBACK (cb_button_release), button);
 232   gtk_box_pack_start (GTK_BOX (box), button->min, TRUE, FALSE, 0);
 233
 234   /* set button text */
 235   bacon_volume_button_update_icon (button);
 236
 237   return GTK_WIDGET (button);
 238 }
 239
 240 float
 241 bacon_volume_button_get_value (BaconVolumeButton * button)
 242 {
 243   g_return_val_if_fail (button != NULL, 0);
 244
 245   return gtk_range_get_value (GTK_RANGE (button->scale));
 246 }
 247
 248 void
 249 bacon_volume_button_set_value (BaconVolumeButton * button,
 250                                float value)
 251 {
 252   g_return_if_fail (button != NULL);
 253
 254   gtk_range_set_value (GTK_RANGE (button->scale), value);
 255 }
 256
 257 /*
 258  * button callbacks.
 259  */
 260
 261 static void
 262 bacon_volume_button_style_set (GtkWidget *widget,
 263                                GtkStyle *previous_style)
 264 {
 265   GTK_WIDGET_CLASS (parent_class)->style_set (widget, previous_style);
 266
 267   bacon_volume_button_load_icons (widget);
 268 }
 269
 270 static gboolean
 271 bacon_volume_button_scroll (GtkWidget      * widget,
 272                             GdkEventScroll * event)
 273 {
 274   BaconVolumeButton *button = BACON_VOLUME_BUTTON (widget);
 275   GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (button->scale));
 276   float d;
 277
 278   if (event->type != GDK_SCROLL)
 279     return FALSE;
 280
 281   d = bacon_volume_button_get_value (button);
 282   if (event->direction == GDK_SCROLL_UP) {
 283     d += adj->step_increment;
 284     if (d > adj->upper)
 285       d = adj->upper;
 286   } else {
 287     d -= adj->step_increment;
 288     if (d < adj->lower)
 289       d = adj->lower;
 290   }
 291   bacon_volume_button_set_value (button, d);
 292
 293   return TRUE;
 294 }
 295
 296 static gboolean
 297 bacon_volume_button_press (GtkWidget      * widget,
 298                            GdkEventButton * event)
 299 {
 300   BaconVolumeButton *button = BACON_VOLUME_BUTTON (widget);
 301   GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (button->scale));
 302   gint x, y, m, dx, dy, sx, sy, ystartoff, mouse_y;
 303   float v;
 304   GdkEventButton *e;
 305   GdkDisplay *display;
 306   GdkScreen *screen;
 307
 308   display = gtk_widget_get_display (widget);
 309   screen = gtk_widget_get_screen (widget);
 310
 311   /* position roughly */
 312   gtk_window_set_screen (GTK_WINDOW (button->dock), screen);
 313
 314   gdk_window_get_origin (widget->window, &x, &y);
 315   x += widget->allocation.x;
 316   y += widget->allocation.y;
 317   gtk_window_move (GTK_WINDOW (button->dock), x, y - (SCALE_SIZE / 2));
 318   gtk_widget_show_all (button->dock);
 319   gdk_window_get_origin (button->dock->window, &dx, &dy);
 320   dy += button->dock->allocation.y;
 321   gdk_window_get_origin (button->scale->window, &sx, &sy);
 322   sy += button->scale->allocation.y;
 323   ystartoff = sy - dy;
 324   mouse_y = event->y;
 325   button->timeout = TRUE;
 326
 327   /* position (needs widget to be shown already) */
 328   v = bacon_volume_button_get_value (button) / (adj->upper - adj->lower);
 329   x += (widget->allocation.width - button->dock->allocation.width) / 2;
 330   y -= ystartoff;
 331   y -= GTK_RANGE (button->scale)->min_slider_size / 2;
 332   m = button->scale->allocation.height -
 333       GTK_RANGE (button->scale)->min_slider_size;
 334   y -= m * (1.0 - v);
 335   y += mouse_y;
 336   gtk_window_move (GTK_WINDOW (button->dock), x, y);
 337   gdk_window_get_origin (button->scale->window, &sx, &sy);
 338
 339   GTK_WIDGET_CLASS (parent_class)->button_press_event (widget, event);
 340
 341   /* grab focus */
 342   gtk_grab_add (button->dock);
 343
 344   if (gdk_pointer_grab (button->dock->window, TRUE,
 345                         GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
 346                         GDK_POINTER_MOTION_MASK, NULL, NULL, event->time)
 347       != GDK_GRAB_SUCCESS) {
 348           gtk_grab_remove (button->dock);
 349           gtk_widget_hide (button->dock);
 350           return FALSE;
 351    }
 352
 353   if (gdk_keyboard_grab (button->dock->window, TRUE, event->time) != GDK_GRAB_SUCCESS) {
 354           gdk_display_pointer_ungrab (display, event->time);
 355           gtk_grab_remove (button->dock);
 356           gtk_widget_hide (button->dock);
 357           return FALSE;
 358   }
 359
 360   gtk_widget_grab_focus (button->dock);
 361
 362   /* forward event to the slider */
 363   e = (GdkEventButton *) gdk_event_copy ((GdkEvent *) event);
 364   e->window = button->scale->window;
 365
 366   /* position: the X position isn't relevant, halfway will work just fine.
 367    * The vertical position should be *exactly* in the middle of the slider
 368    * of the scale; if we don't do that correctly, it'll move from its current
 369    * position, which means a position change on-click, which is bad. */
 370   e->x = button->scale->allocation.width / 2;
 371   m = button->scale->allocation.height -
 372       GTK_RANGE (button->scale)->min_slider_size;
 373   e->y = ((1.0 - v) * m) + GTK_RANGE (button->scale)->min_slider_size / 2;
 374   gtk_widget_event (button->scale, (GdkEvent *) e);
 375   e->window = event->window;
 376   gdk_event_free ((GdkEvent *) e);
 377
 378   button->pop_time = event->time;
 379
 380   return TRUE;
 381 }
 382
 383 static gboolean
 384 bacon_volume_key_release (GtkWidget      * widget,
 385                           GdkEventKey    * event)
 386 {
 387   BaconVolumeButton *button = BACON_VOLUME_BUTTON (widget);
 388   GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (button->scale));
 389   gint x, y, m, dx, dy, sx, sy, ystartoff;
 390   float v;
 391   GdkDisplay *display;
 392   GdkScreen *screen;
 393
 394   if (event->keyval != GDK_space && event->keyval != GDK_Return)
 395     return FALSE;
 396
 397   display = gtk_widget_get_display (widget);
 398   screen = gtk_widget_get_screen (widget);
 399
 400   /* position roughly */
 401   gtk_window_set_screen (GTK_WINDOW (button->dock), screen);
 402
 403   gdk_window_get_origin (widget->window, &x, &y);
 404   x += widget->allocation.x;
 405   y += widget->allocation.y;
 406   gtk_window_move (GTK_WINDOW (button->dock), x, y - (SCALE_SIZE / 2));
 407   gtk_widget_show_all (button->dock);
 408   gdk_window_get_origin (button->dock->window, &dx, &dy);
 409   dy += button->dock->allocation.y;
 410   gdk_window_get_origin (button->scale->window, &sx, &sy);
 411   sy += button->scale->allocation.y;
 412   ystartoff = sy - dy;
 413   button->timeout = TRUE;
 414
 415   /* position (needs widget to be shown already) */
 416   v = bacon_volume_button_get_value (button) / (adj->upper - adj->lower);
 417   x += (widget->allocation.width - button->dock->allocation.width) / 2;
 418   y -= ystartoff;
 419   y -= GTK_RANGE (button->scale)->min_slider_size / 2;
 420   m = button->scale->allocation.height -
 421       GTK_RANGE (button->scale)->min_slider_size;
 422   y -= m * (1.0 - v);
 423   gtk_window_move (GTK_WINDOW (button->dock), x, y);
 424   gdk_window_get_origin (button->scale->window, &sx, &sy);
 425
 426   /* grab focus */
 427   gtk_grab_add (button->dock);
 428
 429   if (gdk_pointer_grab (button->dock->window, TRUE,
 430                         GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK,
 431                         NULL, NULL, event->time)
 432       != GDK_GRAB_SUCCESS) {
 433           gtk_grab_remove (button->dock);
 434           gtk_widget_hide (button->dock);
 435           return FALSE;
 436    }
 437
 438   if (gdk_keyboard_grab (button->dock->window, TRUE, event->time) != GDK_GRAB_SUCCESS) {
 439           gdk_display_pointer_ungrab (display, event->time);
 440           gtk_grab_remove (button->dock);
 441           gtk_widget_hide (button->dock);
 442           return FALSE;
 443   }
 444
 445   gtk_widget_grab_focus (button->scale);
 446
 447   button->pop_time = event->time;
 448
 449   return TRUE;
 450 }
 451
 452 /*
 453  * +/- button callbacks.
 454  */
 455
 456 static gboolean
 457 cb_button_timeout (gpointer data)
 458 {
 459   BaconVolumeButton *button = BACON_VOLUME_BUTTON (data);
 460   GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (button->scale));
 461   float val;
 462   gboolean res = TRUE;
 463
 464   if (button->click_id == 0)
 465     return FALSE;
 466
 467   val = bacon_volume_button_get_value (button);
 468   val += button->direction;
 469   if (val <= adj->lower) {
 470     res = FALSE;
 471     val = adj->lower;
 472   } else if (val > adj->upper) {
 473     res = FALSE;
 474     val = adj->upper;
 475   }
 476   bacon_volume_button_set_value (button, val);
 477
 478   if (!res) {
 479     g_source_remove (button->click_id);
 480     button->click_id = 0;
 481   }
 482
 483   return res;
 484 }
 485
 486 static gboolean
 487 cb_button_press (GtkWidget      * widget,
 488                  GdkEventButton * event,
 489                  gpointer         data)
 490 {
 491   BaconVolumeButton *button = BACON_VOLUME_BUTTON (data);
 492   GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (button->scale));
 493
 494   if (button->click_id != 0)
 495     g_source_remove (button->click_id);
 496   button->direction = (widget == button->plus) ?
 497       fabs (adj->page_increment) : - fabs (adj->page_increment);
 498   button->click_id = g_timeout_add (CLICK_TIMEOUT,
 499                                     (GSourceFunc) cb_button_timeout, button);
 500   cb_button_timeout (button);
 501
 502   return TRUE;
 503 }
 504
 505 static gboolean
 506 cb_button_release (GtkWidget      * widget,
 507                    GdkEventButton * event,
 508                    gpointer         data)
 509 {
 510   BaconVolumeButton *button = BACON_VOLUME_BUTTON (data);
 511
 512   if (button->click_id != 0) {
 513     g_source_remove (button->click_id);
 514     button->click_id = 0;
 515   }
 516
 517   return TRUE;
 518 }
 519
 520 /*
 521  * Scale callbacks.
 522  */
 523
 524 static void
 525 bacon_volume_release_grab (BaconVolumeButton *button,
 526                            GdkEventButton * event)
 527 {
 528   GdkEventButton *e;
 529   GdkDisplay *display;
 530
 531   /* ungrab focus */
 532   display = gtk_widget_get_display (GTK_WIDGET (button));
 533   gdk_display_keyboard_ungrab (display, event->time);
 534   gdk_display_pointer_ungrab (display, event->time);
 535   gtk_grab_remove (button->dock);
 536
 537   /* hide again */
 538   gtk_widget_hide (button->dock);
 539   button->timeout = FALSE;
 540
 541   e = (GdkEventButton *) gdk_event_copy ((GdkEvent *) event);
 542   e->window = GTK_WIDGET (button)->window;
 543   e->type = GDK_BUTTON_RELEASE;
 544   gtk_widget_event (GTK_WIDGET (button), (GdkEvent *) e);
 545   e->window = event->window;
 546   gdk_event_free ((GdkEvent *) e);
 547 }
 548
 549 static gboolean
 550 cb_dock_button_press (GtkWidget      * widget,
 551                       GdkEventButton * event,
 552                       gpointer         data)
 553 {
 554   //GtkWidget *ewidget = gtk_get_event_widget ((GdkEvent *) event);
 555   BaconVolumeButton *button = BACON_VOLUME_BUTTON (data);
 556
 557   if (/*ewidget == button->dock &&*/ event->type == GDK_BUTTON_PRESS) {
 558     bacon_volume_release_grab (button, event);
 559     return TRUE;
 560   }
 561
 562   return FALSE;
 563 }
 564
 565 static gboolean
 566 cb_dock_key_release (GtkWidget      * widget,
 567                      GdkEventKey    * event,
 568                      gpointer         data)
 569 {
 570   BaconVolumeButton *button = BACON_VOLUME_BUTTON (data);
 571
 572   if (event->keyval == GDK_Escape) {
 573     GdkDisplay *display;
 574
 575     /* ungrab focus */
 576     display = gtk_widget_get_display (widget);
 577     gdk_display_keyboard_ungrab (display, event->time);
 578     gdk_display_pointer_ungrab (display, event->time);
 579
 580     /* hide again */
 581     gtk_widget_hide (button->dock);
 582     button->timeout = FALSE;
 583
 584     return TRUE;
 585   }
 586   return FALSE;
 587 }
 588
 589 static gboolean
 590 cb_dock_key_press (GtkWidget      * widget,
 591                    GdkEventKey    * event,
 592                    gpointer         data)
 593 {
 594   if (event->keyval == GDK_Escape) {
 595     return TRUE;
 596   }
 597   return FALSE;
 598 }
 599
 600 /*
 601  * Scale stuff.
 602  */
 603
 604 #define BACON_TYPE_VOLUME_SCALE \
 605   (bacon_volume_scale_get_type ())
 606 #define BACON_VOLUME_SCALE(obj) \
 607   (G_TYPE_CHECK_INSTANCE_CAST ((obj), BACON_TYPE_VOLUME_SCALE, \
 608                                BaconVolumeScale))
 609
 610 typedef struct _BaconVolumeScale {
 611   GtkVScale parent;
 612   BaconVolumeButton *button;
 613 } BaconVolumeScale;
 614
 615 static GType    bacon_volume_scale_get_type      (void);
 616
 617 static void     bacon_volume_scale_class_init    (GtkVScaleClass * klass);
 618
 619 static gboolean bacon_volume_scale_press         (GtkWidget      * widget,
 620                                                   GdkEventButton * event);
 621 static gboolean bacon_volume_scale_release       (GtkWidget      * widget,
 622                                                   GdkEventButton * event);
 623
 624 static GtkVScaleClass *scale_parent_class = NULL;
 625
 626 static GType
 627 bacon_volume_scale_get_type (void)
 628 {
 629   static GType bacon_volume_scale_type = 0;
 630
 631   if (G_UNLIKELY (bacon_volume_scale_type == 0)) {
 632     const GTypeInfo bacon_volume_scale_info = {
 633       sizeof (GtkVScaleClass),
 634       NULL,
 635       NULL,
 636       (GClassInitFunc) bacon_volume_scale_class_init,
 637       NULL,
 638       NULL,
 639       sizeof (BaconVolumeScale),
 640       0,
 641       NULL,
 642       NULL
 643     };
 644
 645     bacon_volume_scale_type =
 646         g_type_register_static (GTK_TYPE_VSCALE,
 647                                 "BaconVolumeScale",
 648                                 &bacon_volume_scale_info, 0);
 649   }
 650
 651   return bacon_volume_scale_type;
 652 }
 653
 654 static void
 655 bacon_volume_scale_class_init (GtkVScaleClass * klass)
 656 {
 657   GtkWidgetClass *gtkwidget_class = GTK_WIDGET_CLASS (klass);
 658   GtkRangeClass *gtkrange_class = GTK_RANGE_CLASS (klass);
 659
 660   scale_parent_class = g_type_class_peek_parent (klass);
 661
 662   gtkwidget_class->button_press_event = bacon_volume_scale_press;
 663   gtkwidget_class->button_release_event = bacon_volume_scale_release;
 664   gtkrange_class->value_changed = bacon_volume_scale_value_changed;
 665 }
 666
 667 static GtkWidget *
 668 bacon_volume_scale_new (BaconVolumeButton * button,
 669                         float min, float max,
 670                         float step)
 671 {
 672   BaconVolumeScale *scale = g_object_new (BACON_TYPE_VOLUME_SCALE, NULL);
 673   GtkObject *adj;
 674
 675   adj = gtk_adjustment_new (min, min, max, step, 10 * step, 0);
 676   gtk_range_set_adjustment (GTK_RANGE (scale), GTK_ADJUSTMENT (adj));
 677   scale->button = button;
 678
 679   return GTK_WIDGET (scale);
 680 }
 681
 682 static gboolean
 683 bacon_volume_scale_press (GtkWidget      * widget,
 684                           GdkEventButton * event)
 685 {
 686   BaconVolumeScale *scale = BACON_VOLUME_SCALE (widget);
 687   BaconVolumeButton *button = scale->button;
 688
 689   /* the scale will grab input; if we have input grabbed, all goes
 690    * horribly wrong, so let's not do that. */
 691   gtk_grab_remove (button->dock);
 692
 693   return GTK_WIDGET_CLASS (scale_parent_class)->button_press_event (widget, event);
 694 }
 695
 696 static gboolean
 697 bacon_volume_scale_release (GtkWidget      * widget,
 698                             GdkEventButton * event)
 699 {
 700   BaconVolumeScale *scale = BACON_VOLUME_SCALE (widget);
 701   BaconVolumeButton *button = scale->button;
 702   gboolean res;
 703
 704   if (button->timeout) {
 705     /* if we did a quick click, leave the window open; else, hide it */
 706     if (event->time > button->pop_time + CLICK_TIMEOUT) {
 707       bacon_volume_release_grab (button, event);
 708       GTK_WIDGET_CLASS (scale_parent_class)->button_release_event (widget, event);
 709       return TRUE;
 710     }
 711     button->timeout = FALSE;
 712   }
 713
 714   res = GTK_WIDGET_CLASS (scale_parent_class)->button_release_event (widget, event);
 715
 716   /* the scale will release input; right after that, we *have to* grab
 717    * it back so we can catch out-of-scale clicks and hide the popup,
 718    * so I basically want a g_signal_connect_after_always(), but I can't
 719    * find that, so we do this complex 'first-call-parent-then-do-actual-
 720    * action' thingy... */
 721   gtk_grab_add (button->dock);
 722
 723   return res;
 724 }
 725
 726 static void
 727 bacon_volume_button_update_icon (BaconVolumeButton *button)
 728 {
 729   GtkRange *range = GTK_RANGE (button->scale);
 730   float val = gtk_range_get_value (range);
 731   GtkAdjustment *adj;
 732   GdkPixbuf *pixbuf;
 733   float step;
 734
 735   adj = gtk_range_get_adjustment (range);
 736   step = (adj->upper - adj->lower) / 4;
 737
 738   if (val == adj->lower)
 739     pixbuf = button->icon[0];
 740   else if (val > adj->lower && val <= adj->lower + step)
 741     pixbuf = button->icon[1];
 742   else if (val > adj->lower + step && val <= adj->lower + step * 2)
 743     pixbuf = button->icon[2];
 744   else
 745     pixbuf = button->icon[3];
 746
 747   gtk_image_set_from_pixbuf (GTK_IMAGE (button->image), pixbuf);
 748 }
 749
 750 static void
 751 bacon_volume_scale_value_changed (GtkRange * range)
 752 {
 753   BaconVolumeScale *scale = BACON_VOLUME_SCALE (range);
 754   BaconVolumeButton *button = scale->button;
 755
 756   bacon_volume_button_update_icon (button);
 757
 758   /* signal */
 759   g_signal_emit (button, signals[SIGNAL_VALUE_CHANGED], 0);
 760 }
 761
 762 static void
 763 bacon_volume_button_load_icons (GtkWidget *widget)
 764 {
 765   BaconVolumeButton *button = BACON_VOLUME_BUTTON (widget);
 766   guint i;
 767   gint w, h;
 768   GdkScreen *screen;
 769   GtkIconTheme *theme;
 770   const char *icon_name[] = {"audio-volume-muted", "audio-volume-low",
 771     "audio-volume-medium", "audio-volume-high"};
 772   const char *fallback_icon_name[] = {"stock_volume-0", "stock_volume-min",
 773     "stock_volume-med", "stock_volume-max"};
 774
 775   screen = gtk_widget_get_screen (widget);
 776   theme = gtk_icon_theme_get_for_screen (screen);
 777
 778   gtk_icon_size_lookup (button->size, &w, &h);
 779
 780   for (i = 0; i < 4; i++) {
 781     GError *error = NULL;
 782     if (button->icon[i] != NULL) {
 783       g_object_unref (button->icon[i]);
 784       button->icon[i] = NULL;
 785     }
 786     button->icon[i] = gtk_icon_theme_load_icon (theme, icon_name[i], w, 0, &error);
 787     if (error) {
 788       g_print ("Couldn't load themed icon '%s': %s\n", icon_name[i], error->message);
 789       g_clear_error (&error);
 790
 791       button->icon[i] = gtk_icon_theme_load_icon (theme, fallback_icon_name[i], w, 0, &error);
 792       if (error) {
 793         g_print ("Couldn't load themed icon '%s': %s\n", icon_name[i], error->message);
 794         g_clear_error (&error);
 795       }
 796     }
 797   }
 798
 799   /* Apply the new icons */
 800   bacon_volume_button_update_icon (button);
 801 }
 802
 803 /*
 804  * vim: sw=2 ts=8 cindent noai bs=2
 805  */