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Determines the average item size.
ACanvas - Canvas to measure on. On entry to this method it is assumed the canvas brush, pen and font are initialized to the proper values.
AvgItemSize determines the average size of the items in the list. It depends on the implementation how this value is determined (either by iterating over the items and calculate the real average or by assuming data depending on current font, etc).<br>
The value returned should be considered a rough indication, not an exact value. It's possible that either the width, height or both are educated guesses based on the current select font.<br>
The caller is responsible for initializing the canvas to the brush, pen and font color.<br>
Last changed by obones on 2009-01-04 21:13:59 CET
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