Add led indicator setting, use one setting for notifications, move it under general

src/LedIndicator.cpp

@@ -0,0 +1,51 @@
+#include "../include/LedIndicator.hpp"
+
+#include <X11/XKBlib.h>
+
+namespace gsr {
+    LedIndicator::LedIndicator(Display *dpy) : dpy(dpy) {
+        scroll_lock_atom = XInternAtom(dpy, "Scroll Lock", False);
+        XkbSetNamedIndicator(dpy, scroll_lock_atom, True, False, False, NULL);
+    }
+
+    LedIndicator::~LedIndicator() {
+        XkbSetNamedIndicator(dpy, scroll_lock_atom, True, False, False, NULL);
+    }
+
+    void LedIndicator::set_led(bool enabled) {
+        led_enabled = enabled;
+        perform_blink = false;
+    }
+
+    void LedIndicator::blink() {
+        perform_blink = true;
+        blink_timer.restart();
+    }
+
+    void LedIndicator::update_led(bool new_state) {
+        if(new_state == led_indicator_on)
+            return;
+
+        led_indicator_on = new_state;
+        XkbSetNamedIndicator(dpy, scroll_lock_atom, True, new_state, False, NULL);
+    }
+
+    void LedIndicator::update() {
+        if(perform_blink) {
+            const double blink_elapsed_sec = blink_timer.get_elapsed_time_seconds();
+            if(blink_elapsed_sec < 0.2) {
+                update_led(false);
+            } else if(blink_elapsed_sec < 0.4) {
+                update_led(true);
+            } else if(blink_elapsed_sec < 0.6) {
+                update_led(false);
+            } else if(blink_elapsed_sec < 0.8) {
+                update_led(true);
+            } else {
+                perform_blink = false;
+            }
+        } else {
+            update_led(led_enabled);
+        }
+    }
+}