Merge pull request #3637 from TripleTrable/backlight/add_min_brightness

#2275  Backlight: Add minimum brightness

man/waybar-backlight.5.scd

@@ -81,6 +81,11 @@ The *backlight* module displays the current backlight level.
 	default: 1.0 ++
 	The speed at which to change the brightness when scrolling.
 
+*min-brightness*: ++
+	typeof: double ++
+	default: 0.0 ++
+	The minimum brightness of the backlight.
+
 *menu*: ++
 	typeof: string ++
 	Action that popups the menu.

src/modules/backlight.cpp

@@ -112,6 +112,14 @@ bool waybar::modules::Backlight::handleScroll(GdkEventScroll *e) {
     step = config_["scroll-step"].asDouble();
   }
 
+  double min_brightness = 0;
+  if (config_["min-brightness"].isDouble()) {
+    min_brightness = config_["min-brightness"].asDouble();
+  }
+  if (backend.get_scaled_brightness(preferred_device_) <= min_brightness &&
+      ct == util::ChangeType::Decrease) {
+    return true;
+  }
   backend.set_brightness(preferred_device_, ct, step);
 
   return true;