Type TextPlacement

type TextPlacement interface {
	// OffsetAt is the offset of the caret position nearest to a window point.
	// ok is false when the field has painted nothing to place a caret in.
	OffsetAt(point Point) (offset int, ok bool)
	// CaretBounds is where the caret was painted, in window coordinates, and
	// false while it is out of view.
	CaretBounds() (Rect, bool)
}