I'm trying to draw my own NSTextView cursor. I expect that for each
pulse of the cursor, drawInsertionPointInRect(_:color:turnedOn:) will be
called twice, once with turnedOn == true and, shortly afterward, again
with turnedOn == false.
Instead, my method overriding drawInsertionPointInRect is called once
per pulse. Each time it is called, turnedOn is true. Here is my
override method:
override func drawInsertionPointInRect(rect: NSRect, color: NSColor,
turnedOn: Bool) {
let lctx = alwaysOnOutlet.enter(#function)
defer {
lctx.exit()
}
lctx.print("... rect \(rect) turnedOn \(turnedOn)")
super.drawInsertionPointInRect(rect, color: color, turnedOn: turnedOn)
}
(The lctx bits are just my instrumentation. They boil down to a couple
of Swift.print() calls.)
Here and there on the web, people describe a strategy for actually
clearing the cursor when turnedOn == false. For example,
http://stackoverflow.com/questions/15647874 . They mention
that it's also necessary to override an undocumented function,
_drawInsertionPointInRect. I haven't found any mention that turnedOn is
always true.
Am I wrong in my expectation that drawInsertionPointInRect should be
called sometimes with turnedOn == false? Does anybody else see the
behavior I describe?
Dave
--
David Young //\ Trestle Technology Consulting
(217) 721-9981 Urbana, IL http://trestle.tech/
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