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SDL_syspower.m
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2011 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#ifndef SDL_POWER_DISABLED
#ifdef SDL_POWER_UIKIT
#import <UIKit/UIKit.h>
#include "SDL_power.h"
#include "SDL_timer.h"
#include "SDL_assert.h"
// turn off the battery monitor if it's been more than X ms since last check.
static const int BATTERY_MONITORING_TIMEOUT = 3000;
static Uint32 SDL_UIKitLastPowerInfoQuery = 0;
void
SDL_UIKit_UpdateBatteryMonitoring(void)
{
if (SDL_UIKitLastPowerInfoQuery) {
const Uint32 prev = SDL_UIKitLastPowerInfoQuery;
const UInt32 now = SDL_GetTicks();
const UInt32 ticks = now - prev;
// if timer wrapped (now < prev), shut down, too.
if ((now < prev) || (ticks >= BATTERY_MONITORING_TIMEOUT)) {
UIDevice *uidev = [UIDevice currentDevice];
SDL_assert([uidev isBatteryMonitoringEnabled] == YES);
[uidev setBatteryMonitoringEnabled:NO];
SDL_UIKitLastPowerInfoQuery = 0;
}
}
}
SDL_bool
SDL_GetPowerInfo_UIKit(SDL_PowerState * state, int *seconds, int *percent)
{
UIDevice *uidev = [UIDevice currentDevice];
if (!SDL_UIKitLastPowerInfoQuery) {
SDL_assert([uidev isBatteryMonitoringEnabled] == NO);
[uidev setBatteryMonitoringEnabled:YES];
}
// UIKit_GL_SwapWindow() (etc) will check this and disable the battery
// monitoring if the app hasn't queried it in the last X seconds.
// Apparently monitoring the battery burns battery life. :)
// Apple's docs say not to monitor the battery unless you need it.
SDL_UIKitLastPowerInfoQuery = SDL_GetTicks();
*seconds = -1; // no API to estimate this in UIKit.
switch ([uidev batteryState])
{
case UIDeviceBatteryStateCharging:
*state = SDL_POWERSTATE_CHARGING;
break;
case UIDeviceBatteryStateFull:
*state = SDL_POWERSTATE_CHARGED;
break;
case UIDeviceBatteryStateUnplugged:
*state = SDL_POWERSTATE_ON_BATTERY;
break;
case UIDeviceBatteryStateUnknown:
default:
*state = SDL_POWERSTATE_UNKNOWN;
break;
}
const float level = [uidev batteryLevel];
*percent = ( (level < 0.0f) ? -1 : (((int) (level + 0.5f)) * 100) );
return SDL_TRUE; /* always the definitive answer on iPhoneOS. */
}
#endif /* SDL_POWER_UIKIT */
#endif /* SDL_POWER_DISABLED */
/* vi: set ts=4 sw=4 expandtab: */