How to reverse cycle through the palettes using cycle operator

#1

I am using a cycle palette button created by may be Mohammed (I saw it long back at the time of google groups, so not sure who created it).

I think it must be possible to reverse cycle through the palettes by using negative value in the cycle operator. How to do it by using a modifier key ?

#2

You could make a second button to reverse, quite easity using an alternative actions +[cycle<pals>reverse[]] but untested.

  • Of note is if you dont have too many items you can by definition cycle back to the begining.
  • However to allow a modifier key to alter which action occurs chaNge the code so;
\define cycle-palettes()
<$set name=pals filter="[all[tiddlers+shadows]prefix[$:/palettes/Captivate]]">
<$action-listops $tiddler="$:/palette" $field="text" $subfilter="+[cycle<pals>]"/>
</$set>
\end

To include a modifier test, again untested.

\define cycle-palettes()
<$list filter="[<modifier>match[normal]]" variable=~>
<$set name=pals filter="[all[tiddlers+shadows]prefix[$:/palettes/Captivate]]">
<$action-listops $tiddler="$:/palette" $field="text" $subfilter="+[cycle<pals>]"/>
</$set>
</$list>
<$list filter="[<modifier>match[alt]]" variable=~>
<$set name=pals filter="[all[tiddlers+shadows]prefix[$:/palettes/Captivate]]">
<$action-listops $tiddler="$:/palette" $field="text" $subfilter="+[cycle<pals>reverse[]]"/>
</$set>
</$list>
\end
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#3

@TW_Tones I tried your code here. But the reverse cycling with alt key is not working. Is it working for you?

#4

To correct this, it is simply moving where you use the reverse operator,

Tested on your site and working

<$list filter="[<modifier>match[alt]]" variable=~>
<$set name=pals filter="[all[tiddlers+shadows]prefix[$:/palettes/Captivate]reverse[]]">
<$action-listops $tiddler="$:/palette" $field="text" $subfilter="+[cycle<pals>]"/>
</$set>
</$list>
  • From the subfilter to the definition of pals
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#5

That is actually a nice approach using the stepsize parameter to cycle:

\whitespace trim
\define cycle-palettes()
<$let stepsize={{{ [<modifier>match[alt]then[-1]else[1]] }}}>
<$set name=pals filter="[all[tiddlers+shadows]prefix[$:/palettes/Captivate]]">
<$action-listops $tiddler="$:/palette" $field="text" $subfilter="+[cycle<pals>,<stepsize>]"/>
</$set>
</$let>
\end
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How to reverse toggle fieldvalues of a particular field
#6

Thank you @TW_Tones and @saqimtiaz . Both methods are working perfectly. Now I am confused which one to use. I will keep both of them in my wiki. It will be useful as a reference in the future.

@saqimtiaz I am hearing the term stepsize for the first time. Only reference I could fiind in the official site is this $:/core/modules/filters/x-listops.js.

#7

Have a look at the operator documentation:
https://tiddlywiki.com/#cycle%20Operator

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