Quincey - cheers, that's worked a charm. I whacked in an NSLog to
check, and it was indeed calculating heights for all non-visible cells
with only the placeholder text "Text Cell". I'm still unsure as to why
this led to the weird tiling behaviour rather than just truncated
text, but I have a working solution and I know how to avoid it in
future.
New solution gets the values straight from the XML (using the same
methods as the datasource bits) and avoids using hardcoded values for
the column. To avoid having to faff around setting the same text
attributes which have already been set in Interface Builder, I've just
made a quick copy of the existing cell, getting all that for free.
- (CGFloat)tableView:(NSTableView *)tv heightOfRow:(NSInteger)row
{
// Get column for Tweet Status
NSTableColumn *column = [tv tableColumnWithIdentifier:@"text"];
// Create a copy of the relevant cell - retains text attributes.
NSCell *cell = [[column dataCellForRow:row] copyWithZone:NULL];
// Retrieve stringvalue from XML Data
NSXMLNode *node = [itemNodes objectAtIndex:row];
[cell setStringValue:[self valueForPath:@"text" ofNode:node]];
// Calculate height using cellSizeForBounds, limiting it to width of
column.
// Add 10 pixels for padding.
CGFloat height = [cell cellSizeForBounds:
NSMakeRect(0.0, 0.0, [column width],
1000.0)].height+10.0;
// Profile pics are 48x48, so ensure these are fully visible with
>=10px padding
height = MAX(height,58.0);
// Release the cell copy.
[cell release];
return height;
}
Worth noting that this all goes wrong again if you have autohide
scrollbars enabled, as it results in the column width varying between
calculation and drawing.
Solved, and I am happy.
Cheers,
Alex
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