Atlas - SDL_syspower.m
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
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#ifdef SDL_POWER_UIKIT
25
26#import <UIKit/UIKit.h>
27
28#include "SDL_syspower.h"
29
30#ifndef SDL_PLATFORM_TVOS
31// turn off the battery monitor if it's been more than X ms since last check.
32static const int BATTERY_MONITORING_TIMEOUT = 3000;
33static Uint64 SDL_UIKitLastPowerInfoQuery = 0;
34
35void SDL_UIKit_UpdateBatteryMonitoring(void)
36{
37    if (SDL_UIKitLastPowerInfoQuery) {
38        if (SDL_GetTicks() >= (SDL_UIKitLastPowerInfoQuery + BATTERY_MONITORING_TIMEOUT)) {
39            UIDevice *uidev = [UIDevice currentDevice];
40            SDL_assert([uidev isBatteryMonitoringEnabled] == YES);
41            [uidev setBatteryMonitoringEnabled:NO];
42            SDL_UIKitLastPowerInfoQuery = 0;
43        }
44    }
45}
46#else
47void SDL_UIKit_UpdateBatteryMonitoring(void)
48{
49    // Do nothing.
50}
51#endif // !SDL_PLATFORM_TVOS
52
53bool SDL_GetPowerInfo_UIKit(SDL_PowerState *state, int *seconds, int *percent)
54{
55#ifdef SDL_PLATFORM_TVOS
56    *state = SDL_POWERSTATE_NO_BATTERY;
57    *seconds = -1;
58    *percent = -1;
59#else  // SDL_PLATFORM_TVOS
60    @autoreleasepool {
61        UIDevice *uidev = [UIDevice currentDevice];
62
63        if (!SDL_UIKitLastPowerInfoQuery) {
64            SDL_assert(uidev.isBatteryMonitoringEnabled == NO);
65            uidev.batteryMonitoringEnabled = YES;
66        }
67
68        /* UIKit_GL_SwapWindow() (etc) will check this and disable the battery
69         *  monitoring if the app hasn't queried it in the last X seconds.
70         *  Apparently monitoring the battery burns battery life.  :)
71         *  Apple's docs say not to monitor the battery unless you need it.
72         */
73        SDL_UIKitLastPowerInfoQuery = SDL_GetTicks();
74
75        *seconds = -1; // no API to estimate this in UIKit.
76
77        switch (uidev.batteryState) {
78        case UIDeviceBatteryStateCharging:
79            *state = SDL_POWERSTATE_CHARGING;
80            break;
81
82        case UIDeviceBatteryStateFull:
83            *state = SDL_POWERSTATE_CHARGED;
84            break;
85
86        case UIDeviceBatteryStateUnplugged:
87            *state = SDL_POWERSTATE_ON_BATTERY;
88            break;
89
90        case UIDeviceBatteryStateUnknown:
91        default:
92            *state = SDL_POWERSTATE_UNKNOWN;
93            break;
94        }
95
96        const float level = uidev.batteryLevel;
97        *percent = ((level < 0.0f) ? -1 : ((int)((level * 100) + 0.5f)));
98    }
99#endif // SDL_PLATFORM_TVOS
100
101    return true; // always the definitive answer on iOS.
102}
103
104#endif // SDL_POWER_UIKIT
105#endif // SDL_POWER_DISABLED
106
[FILE END]
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