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CTRunDelegateGetWidthCallback

Defines a pointer to a function that determines the typographic width of glyphs in the run.

Declaration

typealias CTRunDelegateGetWidthCallback = (UnsafeMutableRawPointer) -> CGFloat

Parameters

refCon:
The reference-constant value supplied to the Ctrundelegatecreate(_:_:) function when the run delegate was created.

Return Value

The typographic width of glyphs in the run associated with the run delegate. A value of 0.0 indicates that the glyphs should not be drawn.

Discussion

You would declare the get-width function like this if you were to name it MyGetWidthCallback:

See Also

Callbacks