Fix highlighting

src/gd_sophia_editor.erl

@@ -26,6 +26,7 @@
 -define(H, 255). % High
 -define(M, 192). % Medium
 -define(L, 128). % Low
+-define(D,  64). % Deep-Low
 -define(X,  32). % X-Low
 -define(Z,   0). % Zilch
 
@@ -46,8 +47,9 @@
 -define(brown,         {?L, ?L, ?Z}).
 -define(magenta,       {?L, ?Z, ?L}).
 -define(cyan,          {?Z, ?L, ?L}).
--define(not_black,     {?X, ?X, ?X}).
 -define(grey,          {?L, ?L, ?L}).
+-define(dark_grey,     {?D, ?D, ?D}).
+-define(not_black,     {?X, ?X, ?X}).
 -define(white,         {?M, ?M, ?M}).
 
 styles() ->
@@ -67,6 +69,7 @@ palette(light) ->
       ?STRING     => ?red,
       ?NUMBER     => ?magenta,
       ?OPERATOR   => ?brown,
+      sel_back    => ?grey,
       line_num    => ?brown,
       cursor      => ?black,
       bg          => ?high_white};
@@ -78,6 +81,7 @@ palette(dark) ->
       ?STRING     => ?light_red,
       ?NUMBER     => ?light_magenta,
       ?OPERATOR   => ?yellow,
+      sel_back    => ?dark_grey,
       line_num    => ?yellow,
       cursor      => ?white,
       bg          => ?not_black}.
@@ -118,7 +122,8 @@ set_text(STC, Text) ->
 
 set_colors(STC) ->
     ok = wxStyledTextCtrl:styleClearAll(STC),
-    Palette = #{bg := BGC, cursor := CC, line_num := LNC} = palette(color_mode()),
+    Palette = palette(color_mode()),
+    #{bg := BGC, cursor := CC, line_num := LNC, sel_back := SFB} = Palette,
     Colorize =
         fun(Style) ->
             Color = maps:get(Style, Palette),
@@ -126,6 +131,7 @@ set_colors(STC) ->
             ok = wxStyledTextCtrl:styleSetBackground(STC, Style, BGC)
         end,
     ok = wxStyledTextCtrl:setCaretForeground(STC, CC),
+    ok = wxStyledTextCtrl:setSelBackground(STC, true, SFB),
     ok = wxStyledTextCtrl:styleSetForeground(STC, ?wxSTC_STYLE_LINENUMBER, LNC),
     ok = wxStyledTextCtrl:styleSetBackground(STC, ?wxSTC_STYLE_DEFAULT, BGC),
     lists:foreach(Colorize, styles()).