Hi

In this line  $nb->SetBackgroundColour(Wx::Colour->new(0, 0, 0));  # black, not working

$nb is not $editor, try $editor, try

$editor->StyleSetBackground( Wx::wxSTC_STYLE_LINENUMBER(), Wx::wxRED()
+ ) ;
$editor->StyleSetBackground( Wx::wxSTC_STYLE_DEFAULT(), Wx::wxBLACK() 
+) ;
[download]

Thanks this is working but when I type into the editor the text has still the background white, I want white text on black background. What are those style numbers like wxSTC_STYLE_DEFAULT.

Hi

Try doing this in sub Demo::Panel::new

$self->StyleSetBackground( Wx::wxSTC_STYLE_DEFAULT(), Wx::wxBLACK());
$self->StyleClearAll;
$self->StyleSetBackground( Wx::wxSTC_STYLE_LINENUMBER(), Wx::wxRED());
[download]

Because

http://docs.wxwidgets.org/trunk/classwx_styled_text_ctrl.html#Styling

void wxStyledTextCtrl::StyleClearAll ( )
Clear all the styles and make equivalent to the global default style.

http://www.scintilla.org/ScintillaDoc.html#StyleDefinition

http://www.scintilla.org/ScintillaDoc.html#SCI_STYLECLEARALL

One way to set the styles is to:
1. Set STYLE_DEFAULT to the common features of all styles.
2. Use SCI_STYLECLEARALL to copy this to all styles.
3. Set the style attributes that make your lexical styles different.

https://metacpan.org/pod/Wx::Scintilla::Constant#StylesCommon-enumeration

https://metacpan.org/pod/Wx::Scintilla::Constant#Lexical-states-for-SCLEX_PERL

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