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More work on EPUB CFI

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Kovid Goyal 2012-01-17 06:38:15 +05:30
parent 891c9b45af
commit 0411a32344
3 changed files with 33 additions and 7 deletions
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34
src/calibre/ebooks/oeb/display/cfi.coffee
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@ -13,6 +13,7 @@
3. Much more comprehensive testing/error handling
4. Properly encodes/decodes assertions
5. Handles points in the padding of elements consistently
6. Has a utility method to calculate the CFI for the current viewport position robustly
To check if this script is compatible with the current browser, call
window.cfi.is_compatible() it will throw an exception if not compatible.
@ -86,7 +87,7 @@ window_scroll_pos = (win=window) -> # {{{
return [x, y]
# }}}
viewport_to_document = (x, y, doc) -> # {{{
viewport_to_document = (x, y, doc=window?.document) -> # {{{
until doc == window.document
# We are in a frame
frame = doc.defaultView.frameElement
@ -573,13 +574,36 @@ class CanonicalFragmentIdentifier
minx = max(-winx, -winw)
maxx = winw
get_cfi = (x, y) ->
dist = (p1, p2) ->
Math.sqrt(Math.pow(p1[0]-p2[0], 2), Math.pow(p1[1]-p2[1], 2))
get_cfi = (ox, oy) ->
try
cfi = this.at(x, y)
cfi = this.at(ox, oy)
point = this.point(cfi)
catch err
cfi = null
# TODO: calculate point and check that it is close to current pos
cfi
if point.range != null
r = point.range
rect = r.getClientRects()[0]
x = (point.a*rect.left + (1-point.a)*rect.right)
y = (rect.top + rect.bottom)/2
[x, y] = viewport_to_document(x, y, r.startContainer.ownerDocument)
else
node = point.node
r = node.getBoundingClientRect()
[x, y] = viewport_to_document(r.left, r.top, node.ownerDocument)
if typeof(point.x) == 'number' and node.offsetWidth
x += (point.x*node.offsetWidth)/100
if typeof(point.y) == 'number' and node.offsetHeight
y += (point.y*node.offsetHeight)/100
if dist(viewport_to_document(ox, oy), [x, y]) > 50
cfi = null
return cfi
x_loop = (cury) ->
for direction in [-1, 1]

1
src/calibre/ebooks/oeb/display/test-cfi/iframe.html
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@ -23,6 +23,7 @@
indignation and dislike men who are so beguiled and demoralized by
the charms of pleasure of the moment, so blinded by desire, that
they cannot foresee</p>
<p><img src="marker.png" width="300" height="300" alt="Test image"/></p>
</body>
</html>

5
src/calibre/ebooks/oeb/display/test-cfi/index.html
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@ -1,7 +1,7 @@
<!DOCTYPE html>
<html>
<head>
<title>Testing EPUB CFI</title>
<title>Testing cfi.coffee</title>
<script type="text/javascript" src="cfi.coffee"></script>
<script type="text/javascript" src="cfi-test.coffee"></script>
<style type="text/css">
@ -46,7 +46,8 @@
</head>
<body>
<div id="container">
<h1 id="first-h1">Testing EPUB CFI</h1>
<h1 id="first-h1">Testing cfi.coffee</h1>
<p>Click anywhere and the location will be marked with a marker, whose position is set via a CFI.</p>
<p><a id="reset" href="/">Reset CFI to None</a></p>
<h2>A div with scrollbars</h2>
<p>Scroll down and click on some elements. Make sure to hit both