Make package info on doc title page easier to be selected

[muzimuzhi]

Currently it's not convenient to select the package info (e.g., release date or author name) on doc title page, because the title page is filled by a grid of slanted text boxes as a background.

This issue suggests to make the background non-selectable (need PDF reader's support), by using accsupp package which makes use of PDF's support for accessibility.

tcolorbox-bg-nonselectable.pdf

diff --git a/doc/latex/tcolorbox/tcolorbox.doc.abstract.tex b/doc/latex/tcolorbox/tcolorbox.doc.abstract.tex
index 0bdfb28..0860a2f 100644
--- a/doc/latex/tcolorbox/tcolorbox.doc.abstract.tex
+++ b/doc/latex/tcolorbox/tcolorbox.doc.abstract.tex
@@ -9,6 +9,7 @@
 \coordinate (A) at (0,0); \coordinate (B) at (21,29.7);
 \path[use as bounding box] (A) rectangle coordinate (C) (B);
 \node[transform shape,xslant=0.7,rotate=-10,xshift=0cm] at (C) {%
+  \BeginAccSupp{method=plain,ActualText={}}%
   \begin{tcbraster}[raster columns=4,title=tcolorbox \version,
     fonttitle=\small\bfseries,raster width=50cm]
   \foreach \b in {1,...,28} {\begin{tcolorbox}[enhanced,
@@ -18,6 +19,7 @@
     colbacktitle=boxcol!!+!50!black!30!white,
     colupper=black!30!white]\lipsum[2]\end{tcolorbox}}
   \end{tcbraster}%
+  \EndAccSupp{}%
 };
 \node at (C) {%
   \begin{tcbitemize}[title=tcolorbox \version,fonttitle=\small\bfseries,
diff --git a/doc/latex/tcolorbox/tcolorbox.doc.s_main.sty b/doc/latex/tcolorbox/tcolorbox.doc.s_main.sty
index 3aae917..e1ff256 100644
--- a/doc/latex/tcolorbox/tcolorbox.doc.s_main.sty
+++ b/doc/latex/tcolorbox/tcolorbox.doc.s_main.sty
@@ -40,6 +40,7 @@
   \tcbset{listing engine=listings,initialize@reset={listing engine=listings}}%
 }

+\RequirePackage{accsupp}
 \RequirePackage{hyperref}

[T-F-S]

Well, there is always page 3 with the relevant information.
Nevertheless, I will follow your suggestion for adding accsupp. On my system, it works for Acrobat Reader, but not for SumatraPDF.

[dbitouze]

accsupp works well for most PDF viewers on GNU/Linux.

[muzimuzhi]

Well, there is always page 3 with the relevant information.

Oh my... I'm just too used to jump to the first page with a keyboard shortcut (Home).

[T-F-S]

Done with https://github.com/T-F-S/tcolorbox/releases/tag/v6.0.4