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%D \module
%D [ file=t-chat,
%D version=2024.08.10,
%D title=\CONTEXT\ User Module,
%D subtitle=Chat,
%D author=Henning Hraban Ramm,
%D date=\currentdate,
%D copyright={fiëé visuëlle, H. Ramm},
%D license={GPL 3.0+}]
\unprotect
%D First we define a few colors.
%D Don’t rely on these names, use the “Chat” palet instead.
\definecolor[ChatColorI][c=0,m=.03,y=.15,k=0]
\definecolor[ChatColorII][c=.1,m=0,y=0,k=0]
\definecolor[ChatNameColor][c=0,m=0,y=0,k=.1]
\definecolor[ChatColor][ChatColorI]
\definecolor[ChatFrameColor][ChatNameColor]
%D The palet contains all used colors.
%D ATM there are only 2 different colors for recipient and sender,
%D there should be more colors to distinguish senders.
\definepalet[Chat][
frame=ChatFrameColor,
name=ChatNameColor,
1=ChatColorI,
2=ChatColorII,
]
\installcorenamespace {chat}
\installsimplecommandhandler \??chat {Chat} \??chat
\setupChat[
recipient=,
person=,
\c!distance=.25em,
\c!style={\ss},
\c!width=.8\textwidth,
senderstyle={\ss\bf},
]
% \Chatparameter
\startuniqueMPgraphic{ChatBubble}
% side: 0=right, 1=left
% pos: 0 solo, 1 top, 2 middle, 3 bottom
numeric side, pos ;
string bgcol ;
if "\getvariable{Chat}{Person}" = "\Chatparameter{recipient}" :
side := 0;
bgcol := "Chat:1";
; else :
side := 1;
bgcol := "Chat:2";
; fi ;
if "\getvariable{Chat}{Person}" = "\getvariable{Chat}{PrevPerson}" :
% same as previous person: omit tail
pos := 3;
; else :
% since we can’t know what’s next, go with "solo"
pos := 0;
; fi ;
cradius := .125cm;
tailoffset := .125cm;
tailsize := .25cm;
h := OverlayHeight;
w := OverlayWidth;
if h < (2*cradius + 2*tailsize):
% if the box is too small, reduce radius and tail size
cradius := h/3;
tailsize := h/3;
tailoffset := 0;
fi;
pair ll[],lr[],tl[],tr[],s[];
% corners
ll1 := (0,cradius);
ll2 := (cradius,0);
lr1 := (w,cradius);
lr2 := (w-cradius,0);
% tail points
tl1 := (0,h-cradius);
tl2 := (cradius,h);
tr1 := (w,h-cradius);
tr2 := (w-cradius,h);
s1 := (w,h-cradius-tailoffset);
s2 := (w+tailsize,h-cradius-tailoffset);
s3 := (w,h-cradius-tailoffset-tailsize);
if pos > 1: % disable tail on middle/bottom
%s1 := (w,h-cradius-tailoffset);
s2 := (w,h-cradius-tailoffset);
%s3 := (w,h-cradius-tailoffset-tailsize);
fi;
if (pos = 1) or (pos = 2): % top/middle
lr1 := (w,cradius/3);
lr2 := (w-cradius/3,0);
fi;
if (pos = 2) or (pos = 3): % middle/bottom
tr1 := (w,h-cradius/3);
tr2 := (w-cradius/3,h);
fi;
path p ;
p := (ll1 ... ll2 --- lr2 ... lr1 -- s3 -- s2 -- s1 -- tr1 ... tr2 --- tl2 ... tl1 --- cycle);
% mirror the bubble for left side
if side = 1:
p := p reflectedabout ((w/2,0),(w/2,h));
fi;
fill p withcolor bgcol ;
draw p withpen pencircle scaled 0.75 withcolor "Chat:frame";
setbounds currentpicture to OverlayBox ;
\stopuniqueMPgraphic
\defineframedtext[ChatBubbleFrame][
style=\Chatparameter\s!style,
align=flushleft,
frame=off,
width=\Chatparameter\s!width,
autowidth=force,
offset=0pt,
loffset=2pt,
roffset=3pt,
before={\vskip\dimexpr-1em+\Chatparameter\c!distance\relax},
after={\vskip\dimexpr-\Chatparameter\c!distance\relax},
]
%D Receive text (left-facing).
\defineoverlay[ChatGetOverlay][\uniqueMPgraphic{ChatBubble}]
\defineframedtext[ChatGetFrame][ChatBubbleFrame][
background=ChatGetOverlay,
location=left,
]
%D Send text (right-facing).
\defineoverlay[ChatSendOverlay][\uniqueMPgraphic{ChatBubble}]
\defineframedtext[ChatSendFrame][ChatBubbleFrame][
background=ChatSendOverlay,
location=right,
]
%D This should become an avatar
%D or simply initials in a circle
\defineframed[ChatSenderFramed][
width=1em,
offset=overlay,
frame=off,
style=\Chatparameter{senderstyle},
%offset=0pt,
%loffset=0.25em,
%roffset=0.25em,
%corner=rounded,
%frameradius=.5em,
%background=color,
%backgroundcolor=Chat:frame,
]
%D Only show names (avatars) if person is different from last one
% Sender name: #1 x-offset
\define[1]\ChatSender{\offset[x=#1]{%
\doifnot{\getvariable{Chat}{Person}}{\getvariable{Chat}{PrevPerson}}{
% TODO: style \ss\tfx if more than 2 chars
\ChatSenderFramed{\style[style=\Chatparameter{senderstyle}]{\getvariable{Chat}{Person}}}}%
}%
}
\define[1]\startChat{%
\setevariable{Chat}{PrevPerson}{\getvariable{Chat}{Person}}
\setevariable{Chat}{Person}{#1}
\testpage[1]
\doifelse{\getvariable{Chat}{Person}}{\Chatparameter{recipient}}{
% recipient
\ChatSender{\dimexpr\textwidth-1.25em\relax}
\startnarrow[left=.5em]\startChatSendFrame
}{
% other sender
\ChatSender{-0.25em}
\startnarrow[right=.5em]\startChatGetFrame
}
}
\def\resetChat{%
\setevariable{Chat}{Recipient}{}%
\setevariable{Chat}{Person}{}%
\setevariable{Chat}{PrevPerson}{0}%
}
\def\stopChat{
\doifelse{\getvariable{Chat}{Person}}{\Chatparameter{recipient}}{
% recipient
\stopChatSendFrame%
}{
% other sender
\stopChatGetFrame%
}
\stopnarrow%
}
\resetChat
\protect
\continueifinputfile{t-chat.mkiv}
\starttext
\setupChat[
recipient=A,
]
\starttext
\startChat{A} Do you wanna chat?\stopChat
\startChat{B} Maybe. What about?\stopChat
\startChat{A} How about cats?\stopChat
\startChat{A} or squirrels?\stopChat
\stoptext
\stoptext
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