overleaf/services/web/public/coffee/ide/pdfng/directives/pdfPage.coffee

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CoffeeScript
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define [
"base"
], (App) ->
# App = angular.module 'pdfPage', ['pdfHighlights']
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App.directive 'pdfPage', ['$timeout', 'pdfHighlights', ($timeout, pdfHighlights) ->
{
require: '^pdfViewer',
template: '''
<div class="plv-page-view page-view">
<div class="pdf-canvas"></div>
<div class="plv-text-layer text-layer"></div>
<div class="plv-annotations-layer annotations-layer"></div>
<div class="plv-highlights-layer highlights-layer"></div>
</div>
'''
link: (scope, element, attrs, ctrl) ->
canvasElement = $(element).find('.pdf-canvas')
textElement = $(element).find('.text-layer')
annotationsElement = $(element).find('.annotations-layer')
highlightsElement = $(element).find('.highlights-layer')
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updatePageSize = (size) ->
h = Math.floor(size[0])
w = Math.floor(size[1])
element.height(h)
element.width(w)
canvasElement.height(h)
canvasElement.width(w)
scope.page.sized = true
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isVisible = (containerSize) ->
elemTop = element.offset().top - containerSize[2]
elemBottom = elemTop + element.innerHeight()
visible = (elemTop < containerSize[1] and elemBottom > 0)
scope.page.visible = visible
scope.page.elemTop = elemTop
scope.page.elemBottom = elemBottom
return visible
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renderPage = () ->
scope.document.renderPage {
canvas: canvasElement,
text: textElement
annotations: annotationsElement
highlights: highlightsElement
}, scope.page.pageNum
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pausePage = () ->
scope.document.pause {
canvas: canvasElement,
text: textElement
}, scope.page.pageNum
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# keep track of our page element, so we can access it in the
# parent with scope.pages[i].element
scope.page.element = element
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if (!scope.page.sized && scope.defaultPageSize)
updatePageSize scope.defaultPageSize
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if scope.page.current
# console.log 'we must scroll to this page', scope.page.pageNum, 'at position', scope.page.position
renderPage()
# this is the current page, we want to scroll it into view
scope.document.getPdfViewport(scope.page.pageNum).then (viewport) ->
scope.page.viewport = viewport
ctrl.setPdfPosition(scope.page, scope.page.position)
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scope.$watch 'defaultPageSize', (defaultPageSize) ->
return unless defaultPageSize?
updatePageSize defaultPageSize
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watchHandle = scope.$watch 'containerSize', (containerSize, oldVal) ->
return unless containerSize?
return unless scope.page.sized
oldVisible = scope.page.visible
newVisible = isVisible containerSize
scope.page.visible = newVisible
if newVisible && !oldVisible
renderPage()
# TODO deregister this listener after the page is rendered
#watchHandle()
else if !newVisible && oldVisible
pausePage()
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highlightsLayer = new pdfHighlights({
highlights: highlightsElement
})
scope.$watch 'highlights', (highlights, oldVal) ->
return unless highlights?
return unless highlights.length > 0
# console.log 'got highlight watch in pdfPage', scope.page
pageHighlights = (h for h in highlights when h.page == scope.page.pageNum)
return unless pageHighlights.length
scope.document.getPdfViewport(scope.page.pageNum).then (viewport) ->
for hl in pageHighlights
# console.log 'adding highlight', h, viewport
top = viewport.viewBox[3] - hl.v
highlightsLayer.addHighlight viewport, hl.h, top, hl.width, hl.height
$timeout () ->
highlightsLayer.clearHighlights()
, 1000
scope.$on "$destroy", () ->
console.log 'in destroy handler, TODO need to clean up timeout/highlights'
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}
]