rockbox/manual/advanced_topics/viewports/colour-conditional.tex

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\begin{example}
%?C<%Vd(a)|%Vd(b)>
%Vl(a,10,10,50,50,-)
%Cl(0,0,50,50,c,c)
%Cd
%Vl(a,0,70,70,14,1)
%s%acThere you have it: Album art.
%Vl(b,20,14,50,14,1) %Vf(ff0000) %Vb(ffffff)
%t(1)%acWarning:;%t(.1)
%Vl(b,20,30,50,50,1) %Vf(000000) %Vb(ffffff)
%sNo album art found
%scheck your filenames.
\end{example}
This example checks for album art. Album art will be displayed in viewport `a', if
it is found. Otherwise a red flashing warning will be displayed in viewport `b'.