src/power/uikit/SDL_syspower.m
author Ryan C. Gordon <icculus@icculus.org>
Fri, 30 Apr 2010 00:39:31 -0400
changeset 4444 42e1092225f9
child 5262 b530ef003506
permissions -rw-r--r--
Implemented SDL power APIs for iPhoneOS.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2010 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#ifndef SDL_POWER_DISABLED
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#ifdef SDL_POWER_UIKIT
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#import <UIKit/UIKit.h>
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#include "SDL_power.h"
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#include "SDL_timer.h"
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#include "SDL_assert.h"
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// turn off the battery monitor if it's been more than X ms since last check.
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static const int BATTERY_MONITORING_TIMEOUT = 3000;
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static Uint32 SDL_UIKitLastPowerInfoQuery = 0;
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void
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SDL_UIKit_UpdateBatteryMonitoring(void)
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{
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    if (SDL_UIKitLastPowerInfoQuery) {
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        const Uint32 prev = SDL_UIKitLastPowerInfoQuery;
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        const UInt32 now = SDL_GetTicks();
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        const UInt32 ticks = now - prev;
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        // if timer wrapped (now < prev), shut down, too.
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        if ((now < prev) || (ticks >= BATTERY_MONITORING_TIMEOUT)) {
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            UIDevice *uidev = [UIDevice currentDevice];
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            SDL_assert([uidev isBatteryMonitoringEnabled] == YES);
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            [uidev setBatteryMonitoringEnabled:NO];
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            SDL_UIKitLastPowerInfoQuery = 0;
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        }
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    }
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}
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SDL_bool
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SDL_GetPowerInfo_UIKit(SDL_PowerState * state, int *seconds, int *percent)
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{
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    UIDevice *uidev = [UIDevice currentDevice];
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    if (!SDL_UIKitLastPowerInfoQuery) {
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        SDL_assert([uidev isBatteryMonitoringEnabled] == NO);
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        [uidev setBatteryMonitoringEnabled:YES];
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    }
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    // UIKit_GL_SwapWindow() (etc) will check this and disable the battery
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    //  monitoring if the app hasn't queried it in the last X seconds.
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    //  Apparently monitoring the battery burns battery life.  :)
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    //  Apple's docs say not to monitor the battery unless you need it.
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    SDL_UIKitLastPowerInfoQuery = SDL_GetTicks();
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    *seconds = -1;   // no API to estimate this in UIKit.
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    switch ([uidev batteryState])
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    {
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        case UIDeviceBatteryStateCharging:
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            *state = SDL_POWERSTATE_CHARGING;
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            break;
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        case UIDeviceBatteryStateFull:
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            *state = SDL_POWERSTATE_CHARGED;
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            break;
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        case UIDeviceBatteryStateUnplugged:
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            *state = SDL_POWERSTATE_ON_BATTERY;
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            break;
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        case UIDeviceBatteryStateUnknown:
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        default:
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            *state = SDL_POWERSTATE_UNKNOWN;
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            break;
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    }
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    const float level = [uidev batteryLevel];
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    *percent = ( (level < 0.0f) ? -1 : (((int) (level + 0.5f)) * 100) );
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    return SDL_TRUE;            /* always the definitive answer on iPhoneOS. */
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}
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#endif /* SDL_POWER_UIKIT */
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#endif /* SDL_POWER_DISABLED */
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