wibox: Improve constructor functions for some layouts

Signed-off-by: Uli Schlachter <psychon@znc.in>

lib/wibox/layout/mirror.lua.in

@@ -98,7 +98,9 @@ end
 -- :set_widget() to set the widget and
 -- :set_horizontal() and :set_vertical() for the direction.
 -- horizontal and vertical are by default false which doesn't change anything.
-local function new()
+-- @param widget The widget to display (optional)
+-- @param reflection A table describing the reflection to apply (optional)
+local function new(widget, reflection)
     local ret = widget_base.make_widget()
     ret.horizontal = false
     ret.vertical = false
@@ -113,6 +115,9 @@ local function new()
         ret:emit_signal("widget::updated")
     end
 
+    ret:set_widget(widget)
+    ret:set_reflection(reflection or {})
+
     return ret
 end
 

lib/wibox/layout/rotate.lua.in

@@ -99,6 +99,8 @@ end
 --- Returns a new rotate layout. A rotate layout rotates a given widget. Use
 -- :set_widget() to set the widget and :set_direction() for the direction.
 -- The default direction is "north" which doesn't change anything.
+-- @param widget The widget to display (optional)
+-- @param dir The direction to rotate to (optional)
 local function new(widget, dir)
     local ret = widget_base.make_widget()
 

lib/wibox/widget/background.lua.in

@@ -94,7 +94,11 @@ function background:set_bgimage(image)
     self._emit_updated()
 end
 
-local function new(widget)
+--- Returns a new background layout. A background layout applies a background
+-- and foreground color to another widget.
+-- @param widget The widget to display (optional)
+-- @param bg The background to use for that widget (optional)
+local function new(widget, bg)
     local ret = base.make_widget()
 
     for k, v in pairs(background) do
@@ -108,6 +112,7 @@ local function new(widget)
     end
 
     ret:set_widget(widget)
+    ret:set_bg(bg)
 
     return ret
 end