All report properties are expressions to evaluate at runtime. This makes it
really
easy to, for instance, adjust the font size of a string object on the fly.
For instance, I'm making a report with 12 columns, and one of the columns
usually has
length of 4 characters or less, but can be as long as 20 characters. Allowing
for 20
characters makes the column appear too wide in the normal case.
So, instead of the fixed FontSize of 9, and a column width of 110, I set the
column
width at 75 and a dynamic FontSize. Here's the rfxml for the field in question:
<String>
<expr>self.fold</expr>
<FontSize>(7 if len(self.fold) > 7 else 9)</FontSize>
<Width>75</Width>
<x>43</x>
<y>0</y>
</String>
The dynamic nature of all report properties makes it really easy to design for
the
general case but still allow for the exceptional ones.
Other uses of this would be in coloring fields based on certain criteria, etc.
Paul
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