On 02/07/2009, at 11:57 AM, Adam R. Maxwell wrote:
On Jul 1, 2009, at 6:40 PM, Graham Cox wrote:
On 02/07/2009, at 10:09 AM, Peter Zegelin wrote:
Problem with this is there is no obvious concordance ( that I can
see) between a row and its rectangle.
Wouldn't scrolling affect all this?
I wonder if the delegate method:
- (void)tableView:(NSTableView *)aTableView willDisplayCell:
(id)aCell forTableColumn:(NSTableColumn *)aTableColumnrow:
(NSInteger)rowIndex
would be better for your needs? It gives you the row and column so
you know where you are, and is called as part of the drawing loop
of the table, you can just go ahead and draw. Use -rectOfRow to get
the row and paint the background. I just tried the code below and
it works fine:
ISTR having problems with this, possibly due to intercell spacing,
back when we had to draw alternating row colors manually.
Another alternative is to subclass NSTableView and override -
drawRow:clipRect: which might be considered less of a hack than
using the delegate method to draw.
I took that route, using an additional datasource method that I've
defined as tableView:backgroundColorForRow:, and it seems to work
fairly well.
- (void)drawRow:(NSInteger)row clipRect:(NSRect)clipRect;
{
NSColor *color = [[self dataSource] tableView:self
backgroundColorForRow:row];
// ignore any background color if the row is selected
if (color && [self isRowSelected:row] == NO) {
[NSGraphicsContext saveGraphicsState];
NSRectClip(clipRect);
NSRect rowRect = [self rectOfRow:row];
// draw over the alternating row color
[[NSColor whiteColor] setFill];
NSRectFill(NSIntersectionRect(rowRect, clipRect));
// draw with rounded end caps
CGFloat radius = NSHeight(rowRect) / 2.0;
NSBezierPath *p = [NSBezierPath
bezierPathWithRoundedRect:NSInsetRect(rowRect, 1.0, 0.0)
xRadius:radius yRadius:radius];
[color setFill];
[p fill];
[NSGraphicsContext restoreGraphicsState];
}
// draw cells on top of the new row background
[super drawRow:row clipRect:clipRect];
}
Thank you Adam,
I have implemented your suggestion and it is working great. My
delegate just sends a message to the Tableview letting it know which
is the new row to hilite the special way.
cheers,
Peter
www.fracturedsoftware.com/rondo/ - MIDI for your mac
www.fracturedsoftware.com/macsimavr/
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