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WIP: Removing lines that are no longer visible

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This commit is contained in:
Corey Johnson & Nathan Sobo
2012-05-10 12:08:58 -07:00
parent 3f8654c76d
commit c5d2616155
2 changed files with 53 additions and 14 deletions
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29
src/app/editor.coffee
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@@ -240,21 +240,30 @@ class Editor extends View
@lineCache = []
@lines.find('.line').remove()
lastVisibleScreenRow = @getLastVisibleScreenRow()
@firstRenderedScreenRow = 0
@lastRenderedScreenRow = @getLastVisibleScreenRow()
lineElements = @buildLineElements(0, lastVisibleScreenRow)
lineElements.last().css('margin-bottom', (@getLastScreenRow() - lastVisibleScreenRow) * @lineHeight)
lineElements = @buildLineElements(@firstRenderedScreenRow, @lastRenderedScreenRow)
lineElements.last().css('margin-bottom', (@getLastScreenRow() - @lastRenderedScreenRow) * @lineHeight)
@insertLineElements(0, lineElements)
updateLines: ->
firstVisibleScreenRow = @getFirstVisibleScreenRow()
lastVisibleScreenRow = @getLastVisibleScreenRow()
highestRenderedScreenRow = @lines.find('.line').length - 1
if lastVisibleScreenRow > highestRenderedScreenRow
if firstVisibleScreenRow > @firstRenderedScreenRow
@lines.find('.line:first').css('margin-top', 'inherit')
@removeLineElements(@firstRenderedScreenRow, firstVisibleScreenRow - 1)
@lines.find('.line:first').css('margin-top', firstVisibleScreenRow * @lineHeight)
if lastVisibleScreenRow > @lastRenderedScreenRow
@lines.find('.line:last').css('margin-bottom', 'inherit')
lineElements = @buildLineElements(highestRenderedScreenRow + 1, lastVisibleScreenRow)
lineElements = @buildLineElements(@lastRenderedScreenRow + 1, lastVisibleScreenRow)
lineElements.last().css('margin-bottom', (@getLastScreenRow() - lastVisibleScreenRow) * @lineHeight)
@insertLineElements(highestRenderedScreenRow + 1, lineElements)
@insertLineElements(@lastRenderedScreenRow + 1, lineElements)
@lastRenderedScreenRow = lastVisibleScreenRow
@firstRenderedScreenRow = firstVisibleScreenRow
getFirstVisibleScreenRow: ->
Math.floor(@scroller.scrollTop() / @lineHeight)
@@ -369,7 +378,11 @@ class Editor extends View
replaceLineElements: (startRow, endRow, lineElements) ->
@spliceLineElements(startRow, endRow - startRow + 1, lineElements)
spliceLineElements: (startRow, rowCount, lineElements) ->
removeLineElements: (startRow, endRow) ->
@spliceLineElements(startRow, endRow - startRow + 1)
spliceLineElements: (startScreenRow, rowCount, lineElements) ->
startRow = startScreenRow - @firstRenderedScreenRow
endRow = startRow + rowCount
elementToInsertBefore = @lineCache[startRow]
elementsToReplace = @lineCache[startRow...endRow]