On Jan 7, 2009, James Walker wrote:
Having the indentation affect the top level may be technically
consistent, but I don't know why anyone would want it to work that
way.
Yes, I agree. Top-level items should stay near the left margin, and
setting the indent to 0 should not cause top-level disclosure
controls to impinge on neighboring columns. The following fixed it
for my purposes.
// Add to a subclass of NSOutlineView
#define kApplyNSOutlineViewIndentationFix 1
// Changing the indentation of NSOutlineView causes the 0-level items
// to indent possibly large amounts as well, which looks bad.
// Similarly, if the indent is set to small values, disclosure
triangles of
// top level items draw to far to the side and appear in the
neighboring column.
#if kApplyNSOutlineViewIndentationFix
#define kMaxFirstLevelIndentation 16
#define kMinFirstLevelIndentation 10
// corrects text and icons (if using ImageAndTextCell)
- (NSRect)frameOfCellAtColumn:(NSInteger)column row:(NSInteger)row
{
NSRect frame = [super frameOfCellAtColumn:column row:row];
if ( column == 1 ) {
CGFloat indent = [self indentationPerLevel];
if ( indent > kMaxFirstLevelIndentation ) {
frame.origin.x -= (indent - kMaxFirstLevelIndentation);
frame.size.width += (indent -
kMaxFirstLevelIndentation);
}
else if ( indent < kMinFirstLevelIndentation ) {
frame.origin.x += (kMinFirstLevelIndentation - indent);
frame.size.width -= (kMinFirstLevelIndentation -
indent);
}
}
return frame;
}
// corrects disclosure control icon
- (NSRect)frameOfOutlineCellAtRow:(NSInteger)row;
{
NSRect frame = [super frameOfOutlineCellAtRow:row];
CGFloat indent = [self indentationPerLevel];
if ( indent > kMaxFirstLevelIndentation )
frame.origin.x -= (indent - kMaxFirstLevelIndentation);
else if ( indent < kMinFirstLevelIndentation )
frame.origin.x += (kMinFirstLevelIndentation - indent);
return frame;
}
#endif // kApplyNSOutlineViewIndentationFix
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