git.r.bdr.sh - rbdr/dotfiles/blame_incremental - atom/packages/vim-mode/lib/scroll.coffee

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Commit	Line	Data
	1	class Scroll
	2	isComplete: -> true
	3	isRecordable: -> false
	4	constructor: (@editorElement) ->
	5	@scrolloff = 2 # atom default
	6	@editor = @editorElement.getModel()
	7	@rows =
	8	first: @editorElement.getFirstVisibleScreenRow()
	9	last: @editorElement.getLastVisibleScreenRow()
	10	final: @editor.getLastScreenRow()
	11
	12	class ScrollDown extends Scroll
	13	execute: (count=1) ->
	14	@keepCursorOnScreen(count)
	15	@scrollUp(count)
	16
	17	keepCursorOnScreen: (count) ->
	18	{row, column} = @editor.getCursorScreenPosition()
	19	firstScreenRow = @rows.first + @scrolloff + 1
	20	if row - count <= firstScreenRow
	21	@editor.setCursorScreenPosition([firstScreenRow + count, column])
	22
	23	scrollUp: (count) ->
	24	lastScreenRow = @rows.last - @scrolloff
	25	@editor.scrollToScreenPosition([lastScreenRow + count, 0])
	26
	27	class ScrollUp extends Scroll
	28	execute: (count=1) ->
	29	@keepCursorOnScreen(count)
	30	@scrollDown(count)
	31
	32	keepCursorOnScreen: (count) ->
	33	{row, column} = @editor.getCursorScreenPosition()
	34	lastScreenRow = @rows.last - @scrolloff - 1
	35	if row + count >= lastScreenRow
	36	@editor.setCursorScreenPosition([lastScreenRow - count, column])
	37
	38	scrollDown: (count) ->
	39	firstScreenRow = @rows.first + @scrolloff
	40	@editor.scrollToScreenPosition([firstScreenRow - count, 0])
	41
	42	class ScrollCursor extends Scroll
	43	constructor: (@editorElement, @opts={}) ->
	44	super
	45	cursor = @editor.getCursorScreenPosition()
	46	@pixel = @editorElement.pixelPositionForScreenPosition(cursor).top
	47
	48	class ScrollCursorToTop extends ScrollCursor
	49	execute: ->
	50	@moveToFirstNonBlank() unless @opts.leaveCursor
	51	@scrollUp()
	52
	53	scrollUp: ->
	54	return if @rows.last is @rows.final
	55	@pixel -= (@editor.getLineHeightInPixels() * @scrolloff)
	56	@editor.setScrollTop(@pixel)
	57
	58	moveToFirstNonBlank: ->
	59	@editor.moveToFirstCharacterOfLine()
	60
	61	class ScrollCursorToMiddle extends ScrollCursor
	62	execute: ->
	63	@moveToFirstNonBlank() unless @opts.leaveCursor
	64	@scrollMiddle()
	65
	66	scrollMiddle: ->
	67	@pixel -= (@editor.getHeight() / 2)
	68	@editor.setScrollTop(@pixel)
	69
	70	moveToFirstNonBlank: ->
	71	@editor.moveToFirstCharacterOfLine()
	72
	73	class ScrollCursorToBottom extends ScrollCursor
	74	execute: ->
	75	@moveToFirstNonBlank() unless @opts.leaveCursor
	76	@scrollDown()
	77
	78	scrollDown: ->
	79	return if @rows.first is 0
	80	offset = (@editor.getLineHeightInPixels() * (@scrolloff + 1))
	81	@pixel -= (@editor.getHeight() - offset)
	82	@editor.setScrollTop(@pixel)
	83
	84	moveToFirstNonBlank: ->
	85	@editor.moveToFirstCharacterOfLine()
	86
	87	class ScrollHorizontal
	88	isComplete: -> true
	89	isRecordable: -> false
	90	constructor: (@editorElement) ->
	91	@editor = @editorElement.getModel()
	92	cursorPos = @editor.getCursorScreenPosition()
	93	@pixel = @editorElement.pixelPositionForScreenPosition(cursorPos).left
	94	@cursor = @editor.getLastCursor()
	95
	96	putCursorOnScreen: ->
	97	@editor.scrollToCursorPosition({center: false})
	98
	99	class ScrollCursorToLeft extends ScrollHorizontal
	100	execute: ->
	101	@editor.setScrollLeft(@pixel)
	102	@putCursorOnScreen()
	103
	104	class ScrollCursorToRight extends ScrollHorizontal
	105	execute: ->
	106	@editor.setScrollRight(@pixel)
	107	@putCursorOnScreen()
	108
	109	module.exports = {ScrollDown, ScrollUp, ScrollCursorToTop, ScrollCursorToMiddle,
	110	ScrollCursorToBottom, ScrollCursorToLeft, ScrollCursorToRight}