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annotate src/power/uikit/SDL_syspower.m @ 4444:42e1092225f9

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Implemented SDL power APIs for iPhoneOS.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 30 Apr 2010 00:39:31 -0400
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children b530ef003506
rev   line source
4444
42e1092225f9 Implemented SDL power APIs for iPhoneOS.
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #ifndef SDL_POWER_DISABLED
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25 #ifdef SDL_POWER_UIKIT
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26
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27 #import <UIKit/UIKit.h>
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28
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29 #include "SDL_power.h"
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30 #include "SDL_timer.h"
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31 #include "SDL_assert.h"
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32
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33 // turn off the battery monitor if it's been more than X ms since last check.
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34 static const int BATTERY_MONITORING_TIMEOUT = 3000;
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35 static Uint32 SDL_UIKitLastPowerInfoQuery = 0;
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36
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37 void
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38 SDL_UIKit_UpdateBatteryMonitoring(void)
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39 {
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40 if (SDL_UIKitLastPowerInfoQuery) {
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41 const Uint32 prev = SDL_UIKitLastPowerInfoQuery;
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42 const UInt32 now = SDL_GetTicks();
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43 const UInt32 ticks = now - prev;
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44 // if timer wrapped (now < prev), shut down, too.
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45 if ((now < prev) || (ticks >= BATTERY_MONITORING_TIMEOUT)) {
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46 UIDevice *uidev = [UIDevice currentDevice];
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47 SDL_assert([uidev isBatteryMonitoringEnabled] == YES);
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48 [uidev setBatteryMonitoringEnabled:NO];
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49 SDL_UIKitLastPowerInfoQuery = 0;
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50 }
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51 }
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52 }
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53
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54 SDL_bool
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55 SDL_GetPowerInfo_UIKit(SDL_PowerState * state, int *seconds, int *percent)
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56 {
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57 UIDevice *uidev = [UIDevice currentDevice];
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58
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59 if (!SDL_UIKitLastPowerInfoQuery) {
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60 SDL_assert([uidev isBatteryMonitoringEnabled] == NO);
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61 [uidev setBatteryMonitoringEnabled:YES];
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62 }
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63
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64 // UIKit_GL_SwapWindow() (etc) will check this and disable the battery
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65 // monitoring if the app hasn't queried it in the last X seconds.
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66 // Apparently monitoring the battery burns battery life. :)
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67 // Apple's docs say not to monitor the battery unless you need it.
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68 SDL_UIKitLastPowerInfoQuery = SDL_GetTicks();
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69
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70 *seconds = -1; // no API to estimate this in UIKit.
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71
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72 switch ([uidev batteryState])
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73 {
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74 case UIDeviceBatteryStateCharging:
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75 *state = SDL_POWERSTATE_CHARGING;
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76 break;
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77
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78 case UIDeviceBatteryStateFull:
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79 *state = SDL_POWERSTATE_CHARGED;
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80 break;
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81
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82 case UIDeviceBatteryStateUnplugged:
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83 *state = SDL_POWERSTATE_ON_BATTERY;
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84 break;
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85
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86 case UIDeviceBatteryStateUnknown:
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87 default:
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88 *state = SDL_POWERSTATE_UNKNOWN;
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89 break;
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90 }
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91
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92 const float level = [uidev batteryLevel];
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93 *percent = ( (level < 0.0f) ? -1 : (((int) (level + 0.5f)) * 100) );
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94 return SDL_TRUE; /* always the definitive answer on iPhoneOS. */
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95 }
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96
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97 #endif /* SDL_POWER_UIKIT */
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98 #endif /* SDL_POWER_DISABLED */
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99
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100 /* vi: set ts=4 sw=4 expandtab: */