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clean up calculation of visible pdf pages and display on redraw

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This commit is contained in:
Brian Gough 2015-01-20 11:06:40 +00:00
parent 776535f9f3
commit c9e019b4a7
1 changed files with 22 additions and 21 deletions
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43
services/web/public/coffee/ide/pdfng/directives/pdfViewer.coffee
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@ -144,18 +144,18 @@ define [
# find first visible page
visible = $scope.pages.some (page, i) ->
[topPageIdx, topPage] = [i, page] if page.visible
if visible
if visible && topPage.element?
# console.log 'found it', topPageIdx
else
# console.log 'CANNOT FIND TOP PAGE'
return
# console.log 'top page is', topPage.pageNum, topPage.elemTop, topPage.elemBottom, topPage
top = topPage.elemTop
bottom = topPage.elemBottom
viewportTop = 0
viewportHeight = $element.height()
topVisible = (top >= viewportTop && top < viewportTop + viewportHeight)
top = topPage.element.offset().top
bottom = top + topPage.element.innerHeight()
viewportTop = $element.offset().top
viewportBottom = viewportTop + $element.height()
topVisible = (top >= viewportTop && top < viewportBottom)
someContentVisible = (top < viewportTop && bottom > viewportTop)
# console.log 'in PdfListView', top, topVisible, someContentVisible, viewportTop
if topVisible
@ -237,13 +237,10 @@ define [
layoutReady.promise.then () ->
# console.log 'layoutReady was resolved'
# TODO can we combine this with scope.parentSize, need to finalize boxes
updateContainer = () ->
scope.containerSize = [
element.innerWidth()
element.innerHeight()
element.offset().top
]
renderVisiblePages = () ->
visiblePages = getVisiblePages()
pages = getExtraPages visiblePages
scope.document.renderPages(pages)
getVisiblePages = () ->
top = element.offset().top
@ -252,7 +249,11 @@ define [
pageTop = pageElement.offset().top
pageBottom = pageTop + pageElement.innerHeight()
return pageTop < bottom and pageBottom > top
return (page for page in scope.pages when isVisible(page.element))
visiblePages = []
for page in scope.pages
page.visible = visible = isVisible(page.element)
visiblePages.push page if visible
return visiblePages
getExtraPages = (visiblePages) ->
extra = []
@ -282,6 +283,7 @@ define [
ctrl.setScale(scale, h, w).then () ->
spinner.remove(element)
ctrl.redraw(origposition)
$timeout renderVisiblePages, 0
checkElementReady = () ->
# if element is zero-sized keep checking until it is ready
@ -297,7 +299,7 @@ define [
scope.$on 'layout-ready', () ->
# console.log 'GOT LAYOUT READY EVENT'
# console.log 'calling refresh'
updateContainer()
# updateContainer()
spinner.add(element)
layoutReady.resolve 'layout is ready'
scope.parentSize = [
@ -336,21 +338,20 @@ define [
element.on 'scroll', () ->
#console.log 'scroll event', element.scrollTop(), 'adjusting?', scope.adjustingScroll
scope.scrollPosition = element.scrollTop()
#scope.scrollPosition = element.scrollTop()
if scope.adjustingScroll
updateContainer()
renderVisiblePages()
# updateContainer()
scope.$apply()
scope.adjustingScroll = false
return
scope.scrolled = true
#scope.scrolled = true
if scope.scrollHandlerTimeout
$timeout.cancel(scope.scrollHandlerTimeout)
scope.scrollHandlerTimeout = $timeout scrollHandler, 25
scrollHandler = () ->
visiblePages = getVisiblePages()
pages = getExtraPages visiblePages
scope.document.renderPages(pages)
renderVisiblePages()
scope.$apply()
newPosition = ctrl.getPdfPosition()
if newPosition?