1 | /* |
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2 | * Copyright (C) 2008 Red Hat, Inc. |
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3 | * |
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4 | * This program is free software; you can redistribute it and/or modify |
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5 | * it under the terms of the GNU General Public License as published by |
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6 | * the Free Software Foundation; either version 2 of the License, or |
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7 | * (at your option) any later version. |
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8 | * |
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9 | * This program is distributed in the hope that it will be useful, |
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10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 | * GNU General Public License for more details. |
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13 | * |
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14 | * You should have received a copy of the GNU General Public License |
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15 | * along with this program; if not, write to the Free Software |
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16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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17 | * |
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18 | * Written by: Ray Strode <rstrode@redhat.com> |
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19 | */ |
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20 | |
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21 | #include "config.h" |
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22 | #include "gdm-timer.h" |
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23 | |
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24 | #include <stdlib.h> |
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25 | #include <stdio.h> |
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26 | #include <unistd.h> |
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27 | #include <string.h> |
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28 | #include <errno.h> |
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29 | #include <dirent.h> |
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30 | #include <sys/stat.h> |
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31 | |
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32 | #include <glib.h> |
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33 | #include <glib/gi18n.h> |
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34 | #include <glib/gstdio.h> |
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35 | #include <gtk/gtk.h> |
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36 | |
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37 | #include "gdm-marshal.h" |
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38 | |
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39 | #define GDM_TIMER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GDM_TYPE_TIMER, GdmTimerPrivate)) |
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40 | |
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41 | #ifndef GDM_TIMER_TICKS_PER_SECOND |
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42 | #define GDM_TIMER_TICKS_PER_SECOND 60 |
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43 | #endif |
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44 | |
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45 | struct GdmTimerPrivate |
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46 | { |
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47 | double start_time; |
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48 | double duration; |
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49 | |
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50 | guint tick_timeout_id; |
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51 | |
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52 | guint is_started : 1; |
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53 | }; |
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54 | |
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55 | enum { |
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56 | PROP_0, |
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57 | PROP_START_TIME, |
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58 | PROP_DURATION, |
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59 | PROP_IS_STARTED |
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60 | }; |
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61 | |
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62 | enum { |
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63 | TICK, |
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64 | STOP, |
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65 | NUMBER_OF_SIGNALS |
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66 | }; |
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67 | |
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68 | static guint signals[NUMBER_OF_SIGNALS]; |
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69 | |
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70 | static void gdm_timer_class_init (GdmTimerClass *klass); |
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71 | static void gdm_timer_init (GdmTimer *timer); |
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72 | static void gdm_timer_finalize (GObject *object); |
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73 | |
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74 | static void gdm_timer_queue_next_tick (GdmTimer *timer, |
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75 | double when); |
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76 | |
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77 | G_DEFINE_TYPE (GdmTimer, gdm_timer, G_TYPE_OBJECT) |
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78 | |
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79 | static void |
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80 | gdm_timer_finalize (GObject *object) |
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81 | { |
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82 | GdmTimer *timer; |
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83 | |
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84 | timer = GDM_TIMER (object); |
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85 | |
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86 | gdm_timer_stop (timer); |
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87 | |
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88 | G_OBJECT_CLASS (gdm_timer_parent_class)->finalize (object); |
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89 | } |
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90 | |
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91 | static void |
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92 | gdm_timer_get_property (GObject *object, |
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93 | guint prop_id, |
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94 | GValue *value, |
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95 | GParamSpec *pspec) |
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96 | { |
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97 | GdmTimer *timer; |
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98 | |
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99 | timer = GDM_TIMER (object); |
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100 | |
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101 | switch (prop_id) { |
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102 | case PROP_START_TIME: |
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103 | g_value_set_double (value, timer->priv->start_time); |
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104 | break; |
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105 | case PROP_DURATION: |
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106 | g_value_set_double (value, timer->priv->duration); |
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107 | break; |
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108 | case PROP_IS_STARTED: |
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109 | g_value_set_boolean (value, timer->priv->is_started); |
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110 | break; |
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111 | default: |
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112 | G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
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113 | break; |
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114 | } |
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115 | } |
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116 | |
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117 | static void |
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118 | gdm_timer_class_init (GdmTimerClass *klass) |
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119 | { |
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120 | GObjectClass *object_class; |
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121 | |
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122 | object_class = G_OBJECT_CLASS (klass); |
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123 | |
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124 | object_class->finalize = gdm_timer_finalize; |
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125 | |
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126 | object_class->get_property = gdm_timer_get_property; |
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127 | |
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128 | signals[TICK] = g_signal_new ("tick", |
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129 | G_TYPE_FROM_CLASS (object_class), |
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130 | G_SIGNAL_RUN_LAST, |
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131 | G_STRUCT_OFFSET (GdmTimerClass, tick), |
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132 | NULL, |
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133 | NULL, |
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134 | gdm_marshal_VOID__DOUBLE, |
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135 | G_TYPE_NONE, |
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136 | 1, G_TYPE_DOUBLE); |
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137 | signals[STOP] = g_signal_new ("stop", |
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138 | G_TYPE_FROM_CLASS (object_class), |
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139 | G_SIGNAL_RUN_LAST, |
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140 | G_STRUCT_OFFSET (GdmTimerClass, stop), |
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141 | NULL, |
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142 | NULL, |
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143 | g_cclosure_marshal_VOID__VOID, |
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144 | G_TYPE_NONE, 0); |
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145 | |
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146 | g_object_class_install_property (object_class, |
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147 | PROP_DURATION, |
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148 | g_param_spec_double ("duration", |
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149 | _("Duration"), |
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150 | _("Number of seconds until timer stops"), |
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151 | 0.0, G_MAXDOUBLE, 0.0, |
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152 | G_PARAM_READABLE)); |
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153 | |
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154 | g_object_class_install_property (object_class, |
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155 | PROP_START_TIME, |
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156 | g_param_spec_double ("start-time", |
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157 | _("Start time"), |
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158 | _("Time the timer was started"), |
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159 | 0.0, G_MAXDOUBLE, 0.0, |
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160 | G_PARAM_READABLE)); |
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161 | |
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162 | g_object_class_install_property (object_class, |
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163 | PROP_IS_STARTED, |
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164 | g_param_spec_boolean ("is-started", |
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165 | _("Is it Running?"), |
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166 | _("Whether or not the timer " |
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167 | "is currently ticking"), |
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168 | FALSE, G_PARAM_READABLE)); |
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169 | |
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170 | |
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171 | |
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172 | g_type_class_add_private (klass, sizeof (GdmTimerPrivate)); |
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173 | } |
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174 | |
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175 | static void |
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176 | gdm_timer_init (GdmTimer *timer) |
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177 | { |
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178 | timer->priv = GDM_TIMER_GET_PRIVATE (timer); |
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179 | } |
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180 | |
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181 | GdmTimer * |
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182 | gdm_timer_new (void) |
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183 | { |
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184 | GObject *object; |
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185 | |
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186 | object = g_object_new (GDM_TYPE_TIMER, NULL); |
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187 | |
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188 | return GDM_TIMER (object); |
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189 | } |
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190 | |
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191 | static double |
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192 | get_current_time (void) |
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193 | { |
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194 | const double microseconds_per_second = 1000000.0; |
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195 | double timestamp; |
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196 | GTimeVal now; |
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197 | |
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198 | g_get_current_time (&now); |
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199 | |
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200 | timestamp = ((microseconds_per_second * now.tv_sec) + now.tv_usec) / |
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201 | microseconds_per_second; |
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202 | |
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203 | return timestamp; |
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204 | } |
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205 | |
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206 | static double |
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207 | do_tick (GdmTimer *timer, |
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208 | double progress, |
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209 | double current_time) |
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210 | { |
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211 | static const double frequency = 1.0 / GDM_TIMER_TICKS_PER_SECOND; |
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212 | double next_tick; |
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213 | double time_before_tick; |
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214 | double tick_duration; |
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215 | |
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216 | time_before_tick = current_time; |
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217 | g_signal_emit (G_OBJECT (timer), signals[TICK], 0, progress); |
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218 | |
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219 | current_time = get_current_time (); |
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220 | tick_duration = current_time - time_before_tick; |
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221 | |
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222 | next_tick = MAX (frequency - tick_duration, 0.0); |
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223 | |
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224 | return next_tick; |
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225 | } |
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226 | |
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227 | static gboolean |
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228 | on_tick_timeout (GdmTimer *timer) |
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229 | { |
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230 | double progress; |
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231 | double current_time; |
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232 | double elapsed_time; |
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233 | double next_tick; |
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234 | |
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235 | current_time = get_current_time (); |
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236 | elapsed_time = current_time - timer->priv->start_time; |
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237 | progress = elapsed_time / timer->priv->duration; |
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238 | |
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239 | timer->priv->tick_timeout_id = 0; |
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240 | |
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241 | g_object_ref (timer); |
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242 | if (progress > 0.999) { |
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243 | do_tick (timer, 1.0, current_time); |
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244 | if (timer->priv->is_started) { |
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245 | gdm_timer_stop (timer); |
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246 | } |
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247 | } else { |
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248 | next_tick = do_tick (timer, progress, current_time); |
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249 | if (timer->priv->is_started) { |
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250 | gdm_timer_queue_next_tick (timer, next_tick); |
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251 | } |
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252 | } |
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253 | g_object_unref (timer); |
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254 | |
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255 | return FALSE; |
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256 | } |
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257 | |
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258 | static void |
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259 | gdm_timer_queue_next_tick (GdmTimer *timer, |
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260 | double when) |
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261 | { |
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262 | if (timer->priv->tick_timeout_id != 0) { |
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263 | return; |
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264 | } |
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265 | |
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266 | if (!timer->priv->is_started) { |
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267 | return; |
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268 | } |
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269 | |
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270 | timer->priv->tick_timeout_id = g_timeout_add ((guint) (when * 1000), |
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271 | (GSourceFunc) on_tick_timeout, |
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272 | timer); |
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273 | } |
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274 | |
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275 | static void |
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276 | gdm_timer_set_is_started (GdmTimer *timer, |
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277 | gboolean is_started) |
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278 | { |
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279 | timer->priv->is_started = is_started; |
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280 | g_object_notify (G_OBJECT (timer), "is-started"); |
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281 | } |
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282 | |
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283 | void |
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284 | gdm_timer_start (GdmTimer *timer, |
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285 | double number_of_seconds) |
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286 | { |
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287 | double next_tick; |
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288 | |
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289 | g_return_if_fail (GDM_IS_TIMER (timer)); |
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290 | g_return_if_fail (number_of_seconds > G_MINDOUBLE); |
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291 | g_return_if_fail (!timer->priv->is_started); |
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292 | |
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293 | timer->priv->start_time = get_current_time (); |
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294 | timer->priv->duration = number_of_seconds; |
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295 | |
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296 | g_assert (timer->priv->tick_timeout_id == 0); |
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297 | gdm_timer_set_is_started (timer, TRUE); |
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298 | |
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299 | g_object_ref (timer); |
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300 | next_tick = do_tick (timer, 0.0, timer->priv->start_time); |
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301 | gdm_timer_queue_next_tick (timer, next_tick); |
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302 | g_object_unref (timer); |
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303 | } |
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304 | |
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305 | void |
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306 | gdm_timer_stop (GdmTimer *timer) |
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307 | { |
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308 | g_return_if_fail (GDM_IS_TIMER (timer)); |
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309 | |
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310 | if (!timer->priv->is_started) { |
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311 | return; |
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312 | } |
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313 | |
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314 | if (timer->priv->tick_timeout_id != 0) { |
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315 | g_source_remove (timer->priv->tick_timeout_id); |
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316 | timer->priv->tick_timeout_id = 0; |
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317 | } |
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318 | |
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319 | gdm_timer_set_is_started (timer, FALSE); |
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320 | g_signal_emit (G_OBJECT (timer), signals[STOP], 0); |
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321 | } |
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322 | |
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323 | gboolean |
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324 | gdm_timer_is_started (GdmTimer *timer) |
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325 | { |
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326 | g_return_val_if_fail (GDM_IS_TIMER (timer), FALSE); |
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327 | |
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328 | return timer->priv->is_started; |
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329 | } |
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