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78 lines
3 KiB
CoffeeScript
78 lines
3 KiB
CoffeeScript
define [
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], () ->
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class SafariScrollPatcher
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constructor: ($scope) ->
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@isOverAce = false # Flag to control if the pointer is over Ace.
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@pdfDiv = null
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@aceDiv = null
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# Start listening to PDF wheel events when the pointer leaves the PDF region.
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# P.S. This is the problem in a nutshell: although the pointer is elsewhere,
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# wheel events keep being dispatched to the PDF.
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@handlePdfDivMouseLeave = () =>
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@pdfDiv.addEventListener "wheel", @dispatchToAce
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# Stop listening to wheel events when the pointer enters the PDF region. If
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# the pointer is over the PDF, native behaviour is adequate.
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@handlePdfDivMouseEnter = () =>
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@pdfDiv.removeEventListener "wheel", @dispatchToAce
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# Set the "pointer over Ace" flag as false, when the mouse leaves its area.
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@handleAceDivMouseLeave = () =>
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@isOverAce = false
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# Set the "pointer over Ace" flag as true, when the mouse enters its area.
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@handleAceDivMouseEnter = () =>
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@isOverAce = true
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# Grab the elements (pdfDiv, aceDiv) and set the "hover" event listeners.
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# If elements are already defined, clear existing event listeners and do
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# the process again (grab elements, set listeners).
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@setListeners = () =>
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@isOverAce = false
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# If elements aren't null, remove existing listeners.
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if @pdfDiv?
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@pdfDiv.removeEventListener @handlePdfDivMouseLeave
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@pdfDiv.removeEventListener @handlePdfDivMouseEnter
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if @aceDiv?
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@aceDiv.removeEventListener @handleAceDivMouseLeave
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@aceDiv.removeEventListener @handleAceDivMouseEnter
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# Grab elements.
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@pdfDiv = document.querySelector ".pdfjs-viewer" # Grab the PDF div.
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@aceDiv = document.querySelector ".ace_content" # Also the editor.
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# Set hover-related listeners.
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@pdfDiv.addEventListener "mouseleave", @handlePdfDivMouseLeave
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@pdfDiv.addEventListener "mouseenter", @handlePdfDivMouseEnter
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@aceDiv.addEventListener "mouseleave", @handleAceDivMouseLeave
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@aceDiv.addEventListener "mouseenter", @handleAceDivMouseEnter
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# Handler for wheel events on the PDF.
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# If the pointer is over Ace, grab the event, prevent default behaviour
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# and dispatch it to Ace.
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@dispatchToAce = (e) =>
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if @isOverAce
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# If this is logged, the problem just happened: the event arrived
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# here (the PDF wheel handler), but it should've gone to Ace.
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# Small timeout - if we dispatch immediately, an exception is thrown.
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window.setTimeout(() =>
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# Dispatch the exact same event to Ace (this will keep values
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# values e.g. `wheelDelta` consistent with user interaction).
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@aceDiv.dispatchEvent e
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, 1)
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# Avoid scrolling the PDF, as we assume this was intended to the
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# editor.
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e.preventDefault()
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# "loaded" event is emitted from the pdfViewer controller $scope. This means
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# that the previous PDF DOM element was destroyed and a new one is available,
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# so we need to grab the elements and set the listeners again.
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$scope.$on "loaded", () =>
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@setListeners()
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