Tooltip for view based NSTableView

Question

I have a tooltip:

cellView.textField.toolTip = cellView.textField.stringValue;

It shows always, but I need to show tooltip only if text clipped... How I can achieve it?

Answer 1

Set allowsExpansionToolTips property to YES for Table View Cell in xib.

Answer 2

I think you can do this by implementing the text field delegate method, controlTextDidEndEditing, and checking the size of the text. I found that the size returned by sizeWithAttributes: didn't match the size I would have expected when I filled the text field, so I just determined the value I needed for my if statement empirically (in this example I had the text field's value bound to a property, theText).

-(void)controlTextDidEndEditing:(NSNotification *)obj {
    NSLog(@"%@",NSStringFromRect([obj.object frame]));
    NSDictionary *dict = [NSDictionary dictionaryWithObject:[NSFont systemFontOfSize:13] forKey:@"NSFontAttributeName"];
    NSSize size = [theText sizeWithAttributes:dict];
    NSLog(@"%@",NSStringFromSize(size));
    if (size.width >69) {
        [obj.object setToolTip:theText];
    }
}

Answer 3

Try: allowsExpansionToolTips (in Swift , Obj-C )

Expansion tooltips are shown when the cell cannot show the full content and the user hovers the pointer over the control.