The scroller (a transform) of a scrollPane is driven by the scrollBar. The scroll values vary from 0.0, meaning zero offset to 1.0 meaning sufficient offset such that the bottom of the scrollable material appears 3/4 of the way down the pane. The total distance to achieve this range is called the totalScrollRange.

	geometry
	containsPoint: extent: extraScrollRange innerBounds leftoverScrollRange resetExtent resizeScrollBar resizeScroller scrollBarFills: scrollBy: scrollDeltaHeight scrollbarWidth totalScrollRange unadjustedScrollRange

	initialization
	initialize setScrollDeltas

	menu
	addCustomMenuItems:hand: getMenu: leftOrRight menuTitleSelector: retractable: retractableOrNot scrollBarOnLeft:

	object fileIn

	pane events
	handlesMouseDown: handlesMouseOver: keyStroke: mouseDown: mouseMove: mouseUp: scrollByKeyboard:

	retractable scroll bar

	scroll bar events
	scrollBarMenuButtonPressed: scrollBarValue: shiftedTextPaneMenuRequest shiftedYellowButtonActivity unshiftedYellowButtonActivity yellowButtonActivity:

	scrolling
	hideOrShowScrollBar hideScrollBar hideScrollBarIndefinitely isRetractableScrollbarShowing isScrollable isScrollbarShowing isScrolled isScrolledFromTop mouseEnter: mouseLeave: showScrollBar

	access	top
	colorForInsets My submorphs use the surrounding color
	hasFocus hasFocus is currently set by mouse enter/leave events. This inst var should probably be moved up to a higher superclass.
	retractableScrollBar
	scrollBarOnLeft
	scroller
	scroller:
	wantsSlot For now do it the old way, until we sort this out

	geometry	top
	containsPoint:
	extent:
	extraScrollRange Return the amount of extra blank space to include below the bottom of the scroll content.
	innerBounds Return the inner rectangle enclosed by the bounds of this morph excluding the space taken by its borders. For an unbordered morph, this is just its bounds.
	leftoverScrollRange Return the entire scrolling range minus the currently viewed area.
	resetExtent Reset the extent. (may be overridden by subclasses which need to do more than this)
	resizeScrollBar
	resizeScroller
	scrollBarFills: Return true if a flop-out scrollbar fills the rectangle
	scrollBy: Move the contents in the direction delta.
	scrollDeltaHeight Return the increment in pixels which this pane should be scrolled (normally a subclass responsibility).
	scrollbarWidth Includes border
	totalScrollRange Return the entire scrolling range.
	unadjustedScrollRange Return the height extent of the receiver's submorphs.

	initialization	top
	initialize
	setScrollDeltas Set the ScrollBar deltas, value and interval, based on the current scroll pane size, offset and range.

	menu	top
	addCustomMenuItems:hand: Add morph-specific items to the given menu which was invoked by the given hand. This method provides is invoked both from the halo-menu and from the control-menu regimes.
	getMenu: Answer the menu for this text view, supplying an empty menu to be filled in. If the menu selector takes an extra argument, pass in the current state of the shift key.
	leftOrRight Change scroll bar location
	menuTitleSelector:
	retractable:
	retractableOrNot Change scroll bar operation
	scrollBarOnLeft:

object fileIn

top

	pane events	top
	handlesMouseDown: Do I want to receive mouseDown events (mouseDown:, mouseMove:, mouseUp:)?
	handlesMouseOver: Could just ^ true, but this ensures that scroll bars won't flop out if you mouse-over appendages such as connecting pins.
	keyStroke: If pane is not full, pass the event to the last submorph,  assuming it is the most appropriate recipient (!)
	mouseDown: Handle a mouse down event. The default response is to let my eventHandler, if any, handle it.
	mouseMove: If pane is not full, pass the event to the last submorph, assuming it is the most appropriate recipient (!).
	mouseUp: If pane is not full, pass the event to the last submorph, assuming it is the most appropriate recipient (!)
	scrollByKeyboard: If event is ctrl+up/down then scroll and answer true

retractable scroll bar

top

	scroll bar events	top
	scrollBarMenuButtonPressed:
	scrollBarValue:
	shiftedTextPaneMenuRequest The more... button was hit from the text-pane menu
	shiftedYellowButtonActivity
	unshiftedYellowButtonActivity
	yellowButtonActivity:

	scrolling	top
	hideOrShowScrollBar Hide or show the scrollbar depending on if the pane is scrolled/scrollable.
	hideScrollBar
	hideScrollBarIndefinitely Get rid of scroll bar for short panes that don't want it shown.
	isRetractableScrollbarShowing Return true if a retractable scroll bar is currently showing
	isScrollable
	isScrollbarShowing Return true if a retractable scroll bar is currently showing
	isScrolled If the scroller is not set to y = 0, then the pane has been scrolled.
	isScrolledFromTop Have the contents of the pane been scrolled, so that the top of the contents are not visible?
	mouseEnter: Handle a mouseEnter event, meaning the mouse just entered my bounds with no button pressed. The default response is to let my eventHandler, if any, handle it.
	mouseLeave: Handle a mouseLeave event, meaning the mouse just left my bounds with no button pressed. The default response is to let my eventHandler, if any, handle it.
	showScrollBar

	as yet unclassified	top
	includeInNewMorphMenu OK to instantiate