1/**
2
3Doxygen Awesome
4https://github.com/jothepro/doxygen-awesome-css
5
6MIT License
7
8Copyright (c) 2021 jothepro
9
10Permission is hereby granted, free of charge, to any person obtaining a copy
11of this software and associated documentation files (the "Software"), to deal
12in the Software without restriction, including without limitation the rights
13to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14copies of the Software, and to permit persons to whom the Software is
15furnished to do so, subject to the following conditions:
16
17The above copyright notice and this permission notice shall be included in all
18copies or substantial portions of the Software.
19
20THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
26SOFTWARE.
27
28*/
29
30class DoxygenAwesomeDarkModeToggle extends HTMLElement {
31    static prefersLightModeInDarkModeKey = "prefers-light-mode-in-dark-mode"
32    static prefersDarkModeInLightModeKey = "prefers-dark-mode-in-light-mode"
33
34    static _staticConstructor = function() {
35        DoxygenAwesomeDarkModeToggle.darkModeEnabled = DoxygenAwesomeDarkModeToggle.userPreference
36        DoxygenAwesomeDarkModeToggle.enableDarkMode(DoxygenAwesomeDarkModeToggle.darkModeEnabled)
37        // Update the color scheme when the browsers preference changes
38        // without user interaction on the website.
39        window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', event => {
40            DoxygenAwesomeDarkModeToggle.onSystemPreferenceChanged()
41        })
42        // Update the color scheme when the tab is made visible again.
43        // It is possible that the appearance was changed in another tab
44        // while this tab was in the background.
45        document.addEventListener("visibilitychange", visibilityState => {
46            if (document.visibilityState === 'visible') {
47                DoxygenAwesomeDarkModeToggle.onSystemPreferenceChanged()
48            }
49        });
50    }()
51
52    constructor() {
53        super();
54        this.onclick=this.toggleDarkMode
55    }
56
57    /**
58     * @returns `true` for dark-mode, `false` for light-mode system preference
59     */
60    static get systemPreference() {
61        return window.matchMedia('(prefers-color-scheme: dark)').matches
62    }
63
64    /**
65     * @returns `true` for dark-mode, `false` for light-mode user preference
66     */
67    static get userPreference() {
68        return (!DoxygenAwesomeDarkModeToggle.systemPreference && localStorage.getItem(DoxygenAwesomeDarkModeToggle.prefersDarkModeInLightModeKey)) ||
69        (DoxygenAwesomeDarkModeToggle.systemPreference && !localStorage.getItem(DoxygenAwesomeDarkModeToggle.prefersLightModeInDarkModeKey))
70    }
71
72    static set userPreference(userPreference) {
73        DoxygenAwesomeDarkModeToggle.darkModeEnabled = userPreference
74        if(!userPreference) {
75            if(DoxygenAwesomeDarkModeToggle.systemPreference) {
76                localStorage.setItem(DoxygenAwesomeDarkModeToggle.prefersLightModeInDarkModeKey, true)
77            } else {
78                localStorage.removeItem(DoxygenAwesomeDarkModeToggle.prefersDarkModeInLightModeKey)
79            }
80        } else {
81            if(!DoxygenAwesomeDarkModeToggle.systemPreference) {
82                localStorage.setItem(DoxygenAwesomeDarkModeToggle.prefersDarkModeInLightModeKey, true)
83            } else {
84                localStorage.removeItem(DoxygenAwesomeDarkModeToggle.prefersLightModeInDarkModeKey)
85            }
86        }
87        DoxygenAwesomeDarkModeToggle.onUserPreferenceChanged()
88    }
89
90    static enableDarkMode(enable) {
91        let head = document.getElementsByTagName('head')[0]
92        if(enable) {
93            document.documentElement.classList.add("dark-mode")
94            document.documentElement.classList.remove("light-mode")
95        } else {
96            document.documentElement.classList.remove("dark-mode")
97            document.documentElement.classList.add("light-mode")
98        }
99    }
100
101    static onSystemPreferenceChanged() {
102        DoxygenAwesomeDarkModeToggle.darkModeEnabled = DoxygenAwesomeDarkModeToggle.userPreference
103        DoxygenAwesomeDarkModeToggle.enableDarkMode(DoxygenAwesomeDarkModeToggle.darkModeEnabled)
104    }
105
106    static onUserPreferenceChanged() {
107        DoxygenAwesomeDarkModeToggle.enableDarkMode(DoxygenAwesomeDarkModeToggle.darkModeEnabled)
108    }
109
110    toggleDarkMode() {
111        DoxygenAwesomeDarkModeToggle.userPreference = !DoxygenAwesomeDarkModeToggle.userPreference
112    }
113}
114
115customElements.define("doxygen-awesome-dark-mode-toggle", DoxygenAwesomeDarkModeToggle);
116