WordGameLetterMorph implements letter boxes for type-in and display of letter in word games. Several variant displays are supported, depending on the setting of style, and blanks can be displayed as black boxes or empty letter boxes.

Default support for type-in is distributed between this class and WordGamePaneMorph

letter the Character stored in this morph.
Can be either blank or nil as well as a letter.
indexInQuote a retained copy of the index of this character
Facilitates responses to, eg, clicking or typing in this box.
If indexInQuote==nil, then this is displayed as a black box
predecessor another LetterMorph or nil
Used for linked typing and, eg, word selection
successor another LetterMorph or nil
Used for linked typing and, eg, word selection
style a Symbol, one of #(plain boxed underlined)
Boxed and underlined display further depends on whether
the id strings are nil or not.
Each format has an associated default size

The following two variables are also submorphs, as are the id strings if present.
letterMorph a StringMorph for displaying the letter
Used when changing the letter to be displayed
lineMorph a PolygonMorph used to display the underline
and also to place the id string in underlined format

	initialization
	id2: indexInQuote:id1: normalColor setLetter: setLetter:color:

	linking
	morphsInWordDo: nextTypeableLetter previousTypeableLetter startOfWord

	style inits
	boxed plain underlined

	typing
	handlesKeyboard: keyboardFocusChange: unhighlight

	accessing	top
	indexInQuote
	isBlank
	letter
	predecessor
	predecessor:
	successor
	successor:

	initialization	top
	id2: Add further clue id for acrostic puzzles.
	indexInQuote:id1: Initialize me with the given index and an optional idString
	normalColor
	setLetter:
	setLetter:color:

	linking	top
	morphsInWordDo:
	nextTypeableLetter
	previousTypeableLetter
	startOfWord

	style inits	top
	boxed
	plain
	underlined

	typing	top
	handlesKeyboard: Return true if the receiver wishes to handle the given keyboard event
	keyboardFocusChange: The message is sent to a morph when its keyboard focus change. The given argument indicates that the receiver is gaining keyboard focus (versus losing) the keyboard focus. Morphs that accept keystrokes should change their appearance in some way when they are the current keyboard focus. This default implementation does nothing.
	unhighlight

	as yet unclassified	top
	includeInNewMorphMenu Return true for all classes that can be instantiated from the menu
	initialize WordGameLetterMorph initialize