I have a text field that I want to grow and shrink while it is being edited.
In order to do that, I have overridden intrinsicContentSize and textDidChange
in a subclass of NSTextField:
override var intrinsicContentSize: NSSize
{
if let cell = cell, cell.wraps
{
let size = CGSize(width: bounds.size.width, height:
CGFloat.greatestFiniteMagnitude)
let _ = attributedStringValue
let cellSize = cell.cellSize(forBounds: CGRect(origin:
CGPoint(), size: size))
return cellSize
}
else
{
return super.intrinsicContentSize
}
}
override func textDidChange(_ notification: Notification)
{
super.textDidChange(notification)
invalidateIntrinsicContentSize()
}
This works, but if I remove the call to attributedStringValue (whose result is
discarded) the result of the following line fails to reflect changes in the
bounds of the text, and the field fails to grow or shrink.
Presumably, calling attributedStringValue has a side effect which changes the
way that cellSize:forBounds: is calculated.
Is there a way that I can get cellSize:forBounds: to return the correct value
without relying on this side effect?
An alternative way of calculating the intrinsic content size would be to use:
attributedStringValue.boundingRect(with: size, options: .usesLineFragmentOrigin)
but this fails to take account of cell insets.
Jeremy
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