2 * This file is part of DisOrder.
3 * Copyright (C) 2006, 2007 Richard Kettlewell
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 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 #include "disobedience.h"
23 /* Forward declarations ---------------------------------------------------- */
36 static void update_pause(const struct icon
*);
37 static void update_play(const struct icon
*);
38 static void update_scratch(const struct icon
*);
39 static void update_random_enable(const struct icon
*);
40 static void update_random_disable(const struct icon
*);
41 static void update_enable(const struct icon
*);
42 static void update_disable(const struct icon
*);
43 static void clicked_icon(GtkButton
*, gpointer
);
45 static double left(double v
, double b
);
46 static double right(double v
, double b
);
47 static double volume(double l
, double r
);
48 static double balance(double l
, double r
);
50 static void volume_adjusted(GtkAdjustment
*a
, gpointer user_data
);
51 static gchar
*format_volume(GtkScale
*scale
, gdouble value
);
52 static gchar
*format_balance(GtkScale
*scale
, gdouble value
);
54 /* Control bar ------------------------------------------------------------- */
56 static int suppress_set_volume
;
57 /* Guard against feedback loop in volume control */
62 void (*clicked
)(GtkButton
*button
, gpointer userdata
);
63 void (*update
)(const struct icon
*i
);
64 int (*action
)(disorder_eclient
*c
,
65 disorder_eclient_no_response
*completed
,
69 { "pause.png", "Pause playing track", clicked_icon
, update_pause
,
70 disorder_eclient_pause
, 0 },
71 { "play.png", "Resume playing track", clicked_icon
, update_play
,
72 disorder_eclient_resume
, 0 },
73 { "cross.png", "Cancel playing track", clicked_icon
, update_scratch
,
74 disorder_eclient_scratch_playing
, 0 },
75 { "random.png", "Enable random play", clicked_icon
, update_random_enable
,
76 disorder_eclient_random_enable
, 0 },
77 { "randomcross.png", "Disable random play", clicked_icon
, update_random_disable
,
78 disorder_eclient_random_disable
, 0 },
79 { "notes.png", "Enable play", clicked_icon
, update_enable
,
80 disorder_eclient_enable
, 0 },
81 { "notescross.png", "Disable play", clicked_icon
, update_disable
,
82 disorder_eclient_disable
, 0 },
84 #define NICONS (int)(sizeof icons / sizeof *icons)
86 GtkAdjustment
*volume_adj
, *balance_adj
;
88 /* Create the control bar */
89 GtkWidget
*control_widget(void) {
90 GtkWidget
*hbox
= gtk_hbox_new(FALSE
, 1), *vbox
;
94 GtkTooltips
*tips
= gtk_tooltips_new();
99 D(("control_widget"));
100 for(n
= 0; n
< NICONS
; ++n
) {
102 icons
[n
].button
= gtk_button_new();
103 if((pb
= find_image(icons
[n
].icon
))) {
105 content
= gtk_image_new_from_pixbuf(pb
);
108 content
= gtk_label_new(icons
[n
].icon
);
110 gtk_container_add(GTK_CONTAINER(icons
[n
].button
), content
);
111 gtk_tooltips_set_tip(tips
, icons
[n
].button
, icons
[n
].tip
, "");
112 g_signal_connect(G_OBJECT(icons
[n
].button
), "clicked",
113 G_CALLBACK(icons
[n
].clicked
), &icons
[n
]);
114 /* pop the icon in a vbox so it doesn't get vertically stretch if there are
115 * taller things in the control bar */
117 vbox
= gtk_vbox_new(FALSE
, 0);
118 gtk_box_pack_start(GTK_BOX(vbox
), icons
[n
].button
, TRUE
, FALSE
, 0);
119 gtk_box_pack_start(GTK_BOX(hbox
), vbox
, FALSE
, FALSE
, 0);
121 /* create the adjustments for the volume control */
123 volume_adj
= GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, goesupto
,
124 goesupto
/ 20, goesupto
/ 20,
127 balance_adj
= GTK_ADJUSTMENT(gtk_adjustment_new(0, -1, 1,
129 /* the volume control */
131 v
= gtk_hscale_new(volume_adj
);
133 b
= gtk_hscale_new(balance_adj
);
134 gtk_scale_set_digits(GTK_SCALE(v
), 10);
135 gtk_scale_set_digits(GTK_SCALE(b
), 10);
136 gtk_widget_set_size_request(v
, 192, -1);
137 gtk_widget_set_size_request(b
, 192, -1);
138 gtk_tooltips_set_tip(tips
, v
, "Volume", "");
139 gtk_tooltips_set_tip(tips
, b
, "Balance", "");
140 gtk_box_pack_start(GTK_BOX(hbox
), v
, FALSE
, TRUE
, 0);
141 gtk_box_pack_start(GTK_BOX(hbox
), b
, FALSE
, TRUE
, 0);
142 /* space updates rather than hammering the server */
143 gtk_range_set_update_policy(GTK_RANGE(v
), GTK_UPDATE_DELAYED
);
144 gtk_range_set_update_policy(GTK_RANGE(b
), GTK_UPDATE_DELAYED
);
145 /* notice when the adjustments are changed */
146 g_signal_connect(G_OBJECT(volume_adj
), "value-changed",
147 G_CALLBACK(volume_adjusted
), 0);
148 g_signal_connect(G_OBJECT(balance_adj
), "value-changed",
149 G_CALLBACK(volume_adjusted
), 0);
150 /* format the volume/balance values ourselves */
151 g_signal_connect(G_OBJECT(v
), "format-value",
152 G_CALLBACK(format_volume
), 0);
153 g_signal_connect(G_OBJECT(b
), "format-value",
154 G_CALLBACK(format_balance
), 0);
158 /** @brief Update the control bar after some kind of state change */
159 void control_update(void) {
163 D(("control_update"));
164 for(n
= 0; n
< NICONS
; ++n
)
165 icons
[n
].update(&icons
[n
]);
166 l
= volume_l
/ 100.0;
167 r
= volume_r
/ 100.0;
168 ++suppress_set_volume
;;
169 gtk_adjustment_set_value(volume_adj
, volume(l
, r
) * goesupto
);
170 gtk_adjustment_set_value(balance_adj
, balance(l
, r
));
171 --suppress_set_volume
;
174 /** @brief Update the state of one of the control icons
175 * @param button Widget for button
176 * @param visible True if this version of the button should be visible
177 * @param usable True if the button is currently usable
179 * Several of the icons, rather bizarrely, come in pairs: for instance exactly
180 * one of the play and pause buttons is supposed to be visible at any given
183 * @p usable need not take into account server availability, that is done
186 static void update_icon(GtkWidget
*button
,
187 int visible
, int usable
) {
188 /* If the connection is down nothing is ever usable */
189 if(!(disorder_eclient_state(client
) & DISORDER_CONNECTED
))
191 (visible ? gtk_widget_show
: gtk_widget_hide
)(button
);
192 /* Only both updating usability if the button is visible */
194 gtk_widget_set_sensitive(button
, usable
);
197 static void update_pause(const struct icon
*icon
) {
198 int visible
= !(last_state
& DISORDER_TRACK_PAUSED
);
199 int usable
= playing
; /* TODO: might be a lie */
200 update_icon(icon
->button
, visible
, usable
);
203 static void update_play(const struct icon
*icon
) {
204 int visible
= !!(last_state
& DISORDER_TRACK_PAUSED
);
205 int usable
= playing
;
206 update_icon(icon
->button
, visible
, usable
);
209 static void update_scratch(const struct icon
*icon
) {
211 int usable
= playing
;
212 update_icon(icon
->button
, visible
, usable
);
215 static void update_random_enable(const struct icon
*icon
) {
216 int visible
= !(last_state
& DISORDER_RANDOM_ENABLED
);
218 update_icon(icon
->button
, visible
, usable
);
221 static void update_random_disable(const struct icon
*icon
) {
222 int visible
= !!(last_state
& DISORDER_RANDOM_ENABLED
);
224 update_icon(icon
->button
, visible
, usable
);
227 static void update_enable(const struct icon
*icon
) {
228 int visible
= !(last_state
& DISORDER_PLAYING_ENABLED
);
230 update_icon(icon
->button
, visible
, usable
);
233 static void update_disable(const struct icon
*icon
) {
234 int visible
= !!(last_state
& DISORDER_PLAYING_ENABLED
);
236 update_icon(icon
->button
, visible
, usable
);
239 static void clicked_icon(GtkButton
attribute((unused
)) *button
,
241 const struct icon
*icon
= userdata
;
243 icon
->action(client
, 0, 0);
246 static void volume_adjusted(GtkAdjustment
attribute((unused
)) *a
,
247 gpointer
attribute((unused
)) user_data
) {
248 double v
= gtk_adjustment_get_value(volume_adj
) / goesupto
;
249 double b
= gtk_adjustment_get_value(balance_adj
);
251 if(suppress_set_volume
)
252 /* This is the result of an update from the server, not a change from the
253 * user. Don't feedback! */
255 D(("volume_adjusted"));
256 /* force to 'stereotypical' values */
257 v
= nearbyint(100 * v
) / 100;
258 b
= nearbyint(5 * b
) / 5;
259 /* Set the volume. We don't want a reply, we'll get the actual new volume
261 disorder_eclient_volume(client
, 0,
262 nearbyint(left(v
, b
) * 100),
263 nearbyint(right(v
, b
) * 100),
267 /* Called to format the volume value */
268 static gchar
*format_volume(GtkScale
attribute((unused
)) *scale
,
272 snprintf(s
, sizeof s
, "%.1f", (double)value
);
276 /* Called to format the balance value. */
277 static gchar
*format_balance(GtkScale
attribute((unused
)) *scale
,
281 if(fabs(value
) < 0.1)
282 return g_strdup("0");
283 snprintf(s
, sizeof s
, "%+.1f", (double)value
);
287 /* Volume mapping. We consider left, right, volume to be in [0,1]
288 * and balance to be in [-1,1].
290 * First, we just have volume = max(left, right).
292 * Balance we consider to linearly represent the amount by which the quieter
293 * channel differs from the louder. In detail:
295 * if right > left then balance > 0:
296 * balance = 0 => left = right (as an endpoint, not an instance)
297 * balance = 1 => left = 0
298 * fitting to linear, left = right * (1 - balance)
299 * so balance = 1 - left / right
300 * (right > left => right > 0 so no division by 0.)
302 * if left > right then balance < 0:
303 * balance = 0 => right = left (same caveat as above)
304 * balance = -1 => right = 0
305 * again fitting to linear, right = left * (1 + balance)
306 * so balance = right / left - 1
307 * (left > right => left > 0 so no division by 0.)
309 * if left = right then we just have balance = 0.
311 * Thanks to Clive and Andrew.
314 static double max(double x
, double y
) {
315 return x
> y ? x
: y
;
318 static double left(double v
, double b
) {
319 if(b
> 0) /* volume = right */
321 else /* volume = left */
325 static double right(double v
, double b
) {
326 if(b
> 0) /* volume = right */
328 else /* volume = left */
332 static double volume(double l
, double r
) {
336 static double balance(double l
, double r
) {
341 else /* left = right */