Re: Drawing the background of a single row in NSTableView

[Adam R. Maxwell]

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.

- (void)drawRow:(NSInteger)row clipRect:(NSRect)clipRect;
{

    // 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;

        [color setFill];
        [p fill];
        [NSGraphicsContext restoreGraphicsState];
    }
    // draw cells on top of the new row background
    [super drawRow:row clipRect:clipRect];
}

I took that route, using an additional datasource method that I've defined as tableView:backgroundColorForRow:, and it seems to work fairly well. NSColor *color = [[self dataSource] tableView:self backgroundColorForRow:row]; NSBezierPath *p = [NSBezierPath bezierPathWithRoundedRect:NSInsetRect(rowRect, 1.0, 0.0) xRadius:radius yRadius:radius];

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