delphi - How to exchange TList items during a for-loop -


i have tlist which' items continuously processed many for-loops. need exchange items in list in order rearrange order of visual representation of list (in stringgrid).

how exchange these items?

my preliminary thoughts are:

  • during for-loop think items should not exchanged.
  • if exchange in timers' ontimer event, having set timers' interval short interval (e.g. 1 millisecond), think for-loop have intermission of 1 millisecond.

will work? or there better alternatives?

as long ensure count of items in tlist not change, exchanging items fine during for-loop. note that, depending on index of items exchanged, of items may not processed or may processed twice.

if exchange operation not called within for-loop, started for-loop run until done. cannot expect "break in" timer, because timer's message not processed until for-loop , surrounding code done.

so, solution problem be:

  • exchange items within for-loop,
  • use threading solution able 2 different things simultaniously on 1 list (this may need learning threads),
  • wait until for-loop done, , exchange then,
  • split for-loop in multiple slices reduce time needed, or
  • use timer start multiple for-loops in order give program breathing time in between.

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