Dynamically changing row height after font size of entire NSTableView / NSOutlineView

Question

I'm dynamically changing the font size of all the cells in an NSOutlineView. I'm able to successfully change the actual font size: (font size exaggerated for effect):

id cell = [myOutlineColumn dataCell];
[cell setFont: [NSFont fontWithName: @"Geneva" size:32.0] ];

But the row height of the rows in the NSOutlineView don't change. The cells all have the previous height (17 pt) -- but with 32pt text. I've tried [myTable tile] and [myTable reloadData] but that doesn't recompute the row heights.

I saw -noteHeightOfRowsWithIndexesChanged. Is loading up an NSIndexSet and calling noteHeightOfRowsWithIndexesChanged the only method of getting the rows automatically adjusted?

Answer 1

You need to call -setRowHeight: on the outline view after changing the font size. E.g. [outlineView setRowHeight:[font pointSize]+2.0].

For getting the best height for the row, here's what I do in my app:

CGFloat KBDefaultLineHeightForFont (NSFont *font, BOOL sizeForTextField)
{
    if (font == nil)
        font = [NSFont userFontOfSize:0];   // Use default system font if font is nil.

    NSLayoutManager *lm = [[NSLayoutManager alloc] init];

    if (sizeForTextField)
        [lm setTypesetterBehavior:NSTypesetterBehavior_10_2_WithCompatibility];

    // On Mountain Lion and above, string drawing is done without using screen fonts, so we must do the same.
    if (floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_7)
        [lm setUsesScreenFonts:NO];

    CGFloat height = [lm defaultLineHeightForFont:font];
    [lm release];

    return height;
}

Then:

CGFloat rowHeight = MAX(16.0, KBDefaultLineHeightForFont(ovFont, YES) + 3.0);
[outlineView setRowHeight:rowHeight];
[[[[outlineView tableColumns] objectAtIndex:0] dataCell] setFont:ovFont];