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Update visible lines when scrolling up

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This commit is contained in:
Corey Johnson & Nathan Sobo
2012-05-10 16:11:05 -06:00
parent 43ac7edf0f
commit 02da32d372
2 changed files with 70 additions and 55 deletions
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30
src/app/editor.coffee
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@@ -250,19 +250,26 @@ class Editor extends View
firstVisibleScreenRow = @getFirstVisibleScreenRow()
lastVisibleScreenRow = @getLastVisibleScreenRow()
console.log "updateLines", firstVisibleScreenRow, lastVisibleScreenRow
# console.log "cursor screen position", @getCursorScreenPosition().inspect()
if firstVisibleScreenRow > @firstRenderedScreenRow
console.log "removing from", @firstRenderedScreenRow, "to", firstVisibleScreenRow - 1
@removeLineElements(@firstRenderedScreenRow, firstVisibleScreenRow - 1)
@lines.css('padding-top', firstVisibleScreenRow * @lineHeight)
console.log @lines
if lastVisibleScreenRow < @lastRenderedScreenRow
@removeLineElements(lastVisibleScreenRow + 1, @lastRenderedScreenRow)
@lines.css('padding-bottom', (@getLastScreenRow() - lastVisibleScreenRow) * @lineHeight)
if firstVisibleScreenRow < @firstRenderedScreenRow
newLinesStartRow = firstVisibleScreenRow
newLinesEndRow = Math.min(@firstRenderedScreenRow - 1, lastVisibleScreenRow)
lineElements = @buildLineElements(newLinesStartRow, newLinesEndRow)
@insertLineElements(newLinesStartRow, lineElements)
@lines.css('padding-top', firstVisibleScreenRow * @lineHeight)
if lastVisibleScreenRow > @lastRenderedScreenRow
startRow = Math.max(@lastRenderedScreenRow + 1, firstVisibleScreenRow)
lineElements = @buildLineElements(startRow, lastVisibleScreenRow)
@insertLineElements(startRow, lineElements)
newLinesStartRow = Math.max(@lastRenderedScreenRow + 1, firstVisibleScreenRow)
newLinesEndRow = lastVisibleScreenRow
lineElements = @buildLineElements(newLinesStartRow, newLinesEndRow)
@insertLineElements(newLinesStartRow, lineElements)
@lines.css('padding-bottom', (@getLastScreenRow() - lastVisibleScreenRow) * @lineHeight)
@firstRenderedScreenRow = firstVisibleScreenRow
@@ -385,8 +392,13 @@ class Editor extends View
@spliceLineElements(startRow, endRow - startRow + 1)
spliceLineElements: (startScreenRow, rowCount, lineElements) ->
startRow = startScreenRow - @firstRenderedScreenRow
if startScreenRow < @firstRenderedScreenRow
startRow = 0
else
startRow = startScreenRow - @firstRenderedScreenRow
endRow = startRow + rowCount
elementToInsertBefore = @lineCache[startRow]
elementsToReplace = @lineCache[startRow...endRow]
@lineCache[startRow...endRow] = lineElements?.toArray() or []