1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21#include "../../SDL_internal.h"
22
23#ifndef SDL_POWER_DISABLED
24#if SDL_POWER_UIKIT
25
26#import <UIKit/UIKit.h>
27
28#include "SDL_power.h"
29#include "SDL_timer.h"
30#include "SDL_assert.h"
31#include "SDL_syspower.h"
32
33#if !TARGET_OS_TV
34/* turn off the battery monitor if it's been more than X ms since last check. */
35static const int BATTERY_MONITORING_TIMEOUT = 3000;
36static Uint32 SDL_UIKitLastPowerInfoQuery = 0;
37
38void
39SDL_UIKit_UpdateBatteryMonitoring(void)
40{
41    if (SDL_UIKitLastPowerInfoQuery) {
42        if (SDL_TICKS_PASSED(SDL_GetTicks(), SDL_UIKitLastPowerInfoQuery + BATTERY_MONITORING_TIMEOUT)) {
43            UIDevice *uidev = [UIDevice currentDevice];
44            SDL_assert([uidev isBatteryMonitoringEnabled] == YES);
45            [uidev setBatteryMonitoringEnabled:NO];
46            SDL_UIKitLastPowerInfoQuery = 0;
47        }
48    }
49}
50#else
51void
52SDL_UIKit_UpdateBatteryMonitoring(void)
53{
54    /* Do nothing. */
55}
56#endif /* !TARGET_OS_TV */
57
58SDL_bool
59SDL_GetPowerInfo_UIKit(SDL_PowerState * state, int *seconds, int *percent)
60{
61#if TARGET_OS_TV
62    *state = SDL_POWERSTATE_NO_BATTERY;
63    *seconds = -1;
64    *percent = -1;
65#else /* TARGET_OS_TV */
66    @autoreleasepool {
67        UIDevice *uidev = [UIDevice currentDevice];
68
69        if (!SDL_UIKitLastPowerInfoQuery) {
70            SDL_assert(uidev.isBatteryMonitoringEnabled == NO);
71            uidev.batteryMonitoringEnabled = YES;
72        }
73
74        /* UIKit_GL_SwapWindow() (etc) will check this and disable the battery
75         *  monitoring if the app hasn't queried it in the last X seconds.
76         *  Apparently monitoring the battery burns battery life.  :)
77         *  Apple's docs say not to monitor the battery unless you need it.
78         */
79        SDL_UIKitLastPowerInfoQuery = SDL_GetTicks();
80
81        *seconds = -1;   /* no API to estimate this in UIKit. */
82
83        switch (uidev.batteryState) {
84        case UIDeviceBatteryStateCharging:
85            *state = SDL_POWERSTATE_CHARGING;
86            break;
87
88        case UIDeviceBatteryStateFull:
89            *state = SDL_POWERSTATE_CHARGED;
90            break;
91
92        case UIDeviceBatteryStateUnplugged:
93            *state = SDL_POWERSTATE_ON_BATTERY;
94            break;
95
96        case UIDeviceBatteryStateUnknown:
97        default:
98            *state = SDL_POWERSTATE_UNKNOWN;
99            break;
100        }
101
102        const float level = uidev.batteryLevel;
103        *percent = ( (level < 0.0f) ? -1 : ((int) ((level * 100) + 0.5f)) );
104    }
105#endif /* TARGET_OS_TV */
106
107    return SDL_TRUE; /* always the definitive answer on iOS. */
108}
109
110#endif /* SDL_POWER_UIKIT */
111#endif /* SDL_POWER_DISABLED */
112
113/* vi: set ts=4 sw=4 expandtab: */
114