A balloon with text used for the display of explanatory information.

Balloon help is integrated into Morphic as follows:
If a Morph has the property #balloonText, then it will respond to #showBalloon by adding a text balloon to the world, and to #deleteBalloon by removing the balloon.

Moreover, if mouseOverEnabled is true (see class msg), then the Hand will arrange to cause display of the balloon after the mouse has lingered over the morph for a while, and removal of the balloon when the mouse leaves the bounds of that morph. In any case, the Hand will attempt to remove any such balloons before handling mouseDown events, or displaying other balloons.

Balloons should not be duplicated with veryDeepCopy unless their target is also duplicated at the same time.

	as yet unclassified
	morphicLayerNumber

	initialization
	initialize popUpFor:hand: popUpForHand:

	object fileIn

	private
	adjustedCenter setTarget:

	stepping
	step stepTime

	testing
	isBalloonHelp

	private
	getBestLocation:for:corner: getTextMorph: getVertices:

	utility
	balloonColor balloonFont chooseBalloonFont setBalloonColorTo: setBalloonFontTo:

	accessing	top
	balloonOwner

	as yet unclassified	top
	morphicLayerNumber helpful for insuring some morphs always appear in front of or behind others. smaller numbers are in front

	initialization	top
	initialize
	popUpFor:hand: Pop up the receiver as balloon help for the given hand
	popUpForHand: Pop up the receiver as balloon help for the given hand

object fileIn

top

	private	top
	adjustedCenter This horizontal adjustment is needed because we want the interior TextMorph to be centered within the visual balloon rather than simply within the BalloonMorph's bounding box. Without this, balloon-help text would be a bit off-center
	setTarget:

	stepping	top
	step Move with target.
	stepTime Answer the desired time between steps in milliseconds. This default implementation requests that the 'step' method be called once every second.

	testing	top
	isBalloonHelp

	instance creation	top
	string:for:
	string:for:corner: Make up and return a balloon for morph. Find the quadrant that clips the text the least, using cornerName as a tie-breaker. tk 9/12/97

	private	top
	getBestLocation:for:corner: Try four rel locations of the balloon for greatest unclipped area. 12/99 sma
	getTextMorph: Construct text morph.
	getVertices: Construct vertices for a balloon up and to left of anchor

	utility	top
	balloonColor
	balloonFont
	chooseBalloonFont BalloonMorph chooseBalloonFont
	setBalloonColorTo:
	setBalloonFontTo: