85 lines
2.5 KiB
JavaScript
85 lines
2.5 KiB
JavaScript
class BrightnessService extends Service {
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// every subclass of GObject.Object has to register itself
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static {
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// takes three arguments
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// the class itself
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// an object defining the signals
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// an object defining its properties
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Service.register(
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this,
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{
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// 'name-of-signal': [type as a string from GObject.TYPE_<type>],
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'screen-changed': ['float'],
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},
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{
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// 'kebab-cased-name': [type as a string from GObject.TYPE_<type>, 'r' | 'w' | 'rw']
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// 'r' means readable
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// 'w' means writable
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// guess what 'rw' means
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'screen-value': ['float', 'rw'],
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},
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);
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}
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// this Service assumes only one device with backlight
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#interface = Utils.exec("sh -c 'ls -w1 /sys/class/backlight | head -1'");
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// # prefix means private in JS
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#screenValue = 0;
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#max = Number(Utils.exec('brightnessctl max'));
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// the getter has to be in snake_case
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get screen_value() {
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return this.#screenValue;
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}
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// the setter has to be in snake_case too
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set screen_value(percent) {
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if (percent < 0)
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percent = 0;
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if (percent > 1)
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percent = 1;
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Utils.execAsync(`brightnessctl set ${percent * 100}% -q`);
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// the file monitor will handle the rest
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}
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constructor() {
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super();
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// setup monitor
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const brightness = `/sys/class/backlight/${this.#interface}/brightness`;
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Utils.monitorFile(brightness, () => this.#onChange());
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// initialize
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this.#onChange();
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}
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#onChange() {
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this.#screenValue = Number(Utils.exec('brightnessctl get')) / this.#max;
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// signals have to be explicitly emitted
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this.emit('changed'); // emits "changed"
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this.notify('screen-value'); // emits "notify::screen-value"
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// or use Service.changed(propName: string) which does the above two
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// this.changed('screen-value');
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// emit screen-changed with the percent as a parameter
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this.emit('screen-changed', this.#screenValue);
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}
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// overwriting the connect method, let's you
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// change the default event that widgets connect to
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connect(event = 'screen-changed', callback) {
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return super.connect(event, callback);
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}
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}
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// the singleton instance
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const service = new BrightnessService;
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// export to use in other modules
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export default service;
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