info-window: set colors explicitly

lib/rabbit/info-window.rb

@@ -1,4 +1,4 @@
-# Copyright (C) 2006-2018  Kouhei Sutou <[email protected]>
+# Copyright (C) 2006-2023  Sutou Kouhei <[email protected]>
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -230,7 +230,12 @@ def init_canvas_widgets
     def init_timer_area
       @timer_area = Gtk::DrawingArea.new
       @timer_area.signal_connect("draw") do |area, context|
-        context.set_source_rgb(1, 0, 0) if rest_time and rest_time < 0
+        draw_background(area, context)
+        if rest_time and rest_time < 0
+          context.set_source_rgb(1, 0, 0)
+        else
+          context.set_source_rgb(0, 0, 0)
+        end
         draw_text_as_large_as_possible(area,
                                        context,
                                        timer_text,
@@ -242,6 +247,8 @@ def init_timer_area
     def init_note_area
       @note_area = Gtk::DrawingArea.new
       @note_area.signal_connect("draw") do |area, context|
+        draw_background(area, context)
+        context.set_source_rgb(0, 0, 0)
         draw_text_as_large_as_possible(area, context, note_text)
         Gdk::Event::PROPAGATE
       end
@@ -253,6 +260,13 @@ def update
       adjust_slide
     end
 
+    def draw_background(area, context)
+      context.save do
+        context.set_source_rgb(1, 1, 1)
+        context.paint
+      end
+    end
+
     def note_text
       note = @canvas.current_slide["note"]
       return note if note.nil?