feat: added controls to configurable opacity properties

Changes background opacity of control buttons. Default is `0`.

ref #722

src/uosc.conf

@@ -148,15 +148,12 @@ font_scale=1
 text_border=1.2
 # Border radius of buttons, menus, and all other rectangles
 border_radius=4
-# A comma delimited list of color overrides in RGB HEX format.
-# Defaults: foreground=ffffff,foreground_text=000000,background=000000,background_text=ffffff,curtain=111111,
-#           success=a5e075,error=ff616e
+# A comma delimited list of color overrides in RGB HEX format. Defaults:
+# foreground=ffffff,foreground_text=000000,background=000000,background_text=ffffff,curtain=111111,success=a5e075,error=ff616e
 color=
 # A comma delimited list of opacity overrides for various UI element backgrounds and shapes.
-# This does not affect any text, which is always rendered fully opaque.
-# Defaults: timeline=0.9,position=1,chapters=0.8,slider=0.9,slider_gauge=1,speed=0.6,menu=1,submenu=0.4,
-#           border=1,title=1,tooltip=1,thumbnail=1,curtain=0.8,idle_indicator=0.8,audio_indicator=0.5,
-#           buffering_indicator=0.3
+# This does not affect any text, which is always rendered fully opaque. Defaults:
+# timeline=0.9,position=1,chapters=0.8,slider=0.9,slider_gauge=1,controls=0,speed=0.6,menu=1,submenu=0.4,border=1,title=1,tooltip=1,thumbnail=1,curtain=0.8,idle_indicator=0.8,audio_indicator=0.5,buffering_indicator=0.3
 opacity=
 # Use a faster estimation method instead of accurate measurement
 # setting this to `no` might have a noticeable impact on performance, especially in large menus.

src/uosc/elements/Button.lua

@@ -43,11 +43,11 @@ function Button:render()
 	local background = self.active and self.foreground or self.background
 
 	-- Background
-	if is_hover_or_active then
+	if is_hover_or_active or config.opacity.controls > 0 then
 		ass:rect(self.ax, self.ay, self.bx, self.by, {
-			color = self.active and background or foreground,
+			color = (self.active or not is_hover) and background or foreground,
 			radius = state.radius,
-			opacity = visibility * (self.active and 1 or 0.3),
+			opacity = visibility * (self.active and 1 or (is_hover and 0.3 or config.opacity.controls)),
 		})
 	end
 

src/uosc/main.lua

@@ -147,6 +147,7 @@ local config_defaults = {
 		chapters = 0.8,
 		slider = 0.9,
 		slider_gauge = 1,
+		controls = 0,
 		speed = 0.6,
 		menu = 1,
 		submenu = 0.4,