Will using iphone while charging use up battery cycle?

battery capacity decreases as we repeat charging / using the phone.
but what if we use it while it is being charged? will it just use power from
the power source or charge+use up batter at the same time?
i hope it can just use draw power from the external power source and leave
the battery alone if it's full, then I can just use bluetooth and leave
the phone in the dock to not waste battery cycles.

There are two issues here. A cycle is the EQUIVALENT of one complete use of the battery from fully charged to depleted. But it can take place over multiple uses and charges. There is no way to avoid using cycles (or portions of them) other than leaving the phone plugged in all the time. Which brings us to issue two:
The worst thing you can do to your battery (other than letting it get very hot) is to leave it plugged in all the time. This is not because it will overcharge. As others have pointed out, the phone is smart enough to prevent overcharging. But li-ion polymer batteries like to get some "exercise" to say fresh. Apple recommends the equivalent of at least one cycle per month. If it's plugged in constantly, it will not get enough exercise and its capacity will diminish.
-dan

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