mirror of https://github.com/polybar/polybar.git
78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
#pragma once
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#include "components/config.hpp"
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#include "modules/meta/inotify_module.hpp"
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#include "modules/meta/types.hpp"
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#include "settings.hpp"
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POLYBAR_NS
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namespace modules {
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/**
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* Reads value from `/sys/class/backlight/` to get a brightness value for some device.
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*
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* There are two file providing brightness values: `brightness` and `actual_brightness`.
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* The `actual_brightness` file is usually more reliable, but in some cases does not work (provides completely wrong
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* values, doesn't update) depending on kernel version, graphics driver, and/or graphics card.
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* Which file is used is controlled by the use-actual-brightness setting.
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*
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* The general issue with the `brightness` file seems to be that, while it does receive inotify events, the events it
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* receives are not for modification of the file and arrive just before the file is updated with a new value. The module
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* thus reads and displays an outdated brightness value. To compensate for this, the module periodically (controlled by
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* `poll-interval`) forces an update. By default, this is only enabled if the `backlight` file is used.
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*/
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class backlight_module : public inotify_module<backlight_module> {
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public:
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struct brightness_handle {
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void filepath(const string& path);
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float read() const;
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private:
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string m_path;
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};
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string get_output();
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explicit backlight_module(const bar_settings&, string, const config&);
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void idle();
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bool on_event(const inotify_event& event);
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bool build(builder* builder, const string& tag) const;
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static constexpr auto TYPE = BACKLIGHT_TYPE;
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static constexpr const char* EVENT_INC = "inc";
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static constexpr const char* EVENT_DEC = "dec";
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protected:
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void action_inc();
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void action_dec();
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void change_value(int value_mod);
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private:
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static constexpr auto TAG_LABEL = "<label>";
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static constexpr auto TAG_BAR = "<bar>";
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static constexpr auto TAG_RAMP = "<ramp>";
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ramp_t m_ramp;
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label_t m_label;
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progressbar_t m_progressbar;
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string m_path_backlight;
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float m_max_brightness{};
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bool m_scroll{false};
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int m_scroll_interval{5};
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bool m_use_actual_brightness{true};
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brightness_handle m_val;
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brightness_handle m_max;
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int m_percentage = 0;
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chrono::duration<double> m_interval{};
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chrono::steady_clock::time_point m_lastpoll;
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};
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} // namespace modules
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POLYBAR_NS_END
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