On Wed, 5 Nov 2014, Werner Pamler wrote:
For fpspreadsheet I would like to implement the feature of Excel or
Libre/OpenOffice that multiple cell ranges can be selected. The grid
component in this package, TsSpreadsheetGrid, currently can select only a
single range (if goRangeSelect is in the grid's Options) due to its
inheritance from TCustomGrid.
Recompiling the package LCLBase fails with the error: "Property can't have a
default value". I think this message is misleading and confusing because the
true issue seems to me that the set of TGridOptions now contains 33 elements.
In my understanding, the elements of a set correspond to the bits of an
integer. In a 32-bit OS, therefore, a set can only contain 32 elements -
there is one too many now...
Is this interpretation correct?
Yes.
OK, here I could circumvent this issue by introducing a new boolean property
"MultiSelect" which is evaluated when goRangeSelect is active. Maybe this is
even better than the goMultiSelect option because it bypasses the conflict
with goRangeSelect.
But what if I would not have this possibility? Is there a way to extend the
set to more than 32 elements? If not, split the Options into groups of
options like VirtualTreeView does? I fear the options of the grid components
will require a major redsign soon.
The 32-bit limit cannot be circumvented easily.
It would require a major redesign of streaming and rtti.
Your fastest path is splitting the options.
Michael.
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