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Improvements to horizontal viewport check
* Right was calculated incorrectly (but was never used), which has been fixed. * The horizontal viewport check took the absolute value of the element's left, which didn't accurately check the viewport left/element right bound. This has been modified to check the element's left against the viewport's right (whether the element is within the right side of the viewport) and the element's right against the viewport's left (whether the element is within the left side of the viewport). * Adding a new test suite to test viewports of horizontally scrolling content. This verifies that when content is scrolled horizontally (e.g. a list of items), the isInViewport calculations are correct after scrolling.
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Original file line number | Diff line number | Diff line change |
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function runHorizontallyScrollingViewport() { | ||
var visible = ''; | ||
$('li:in-viewport(0, #blocks)').each(function() { | ||
visible += $(this).text() + ' '; | ||
}); | ||
return visible.trim(); | ||
} | ||
|
||
describe('isInViewport', function() { | ||
describe('viewport is a horizonatlly scrollable list (ul#blocks)', function() { | ||
var buidList = function() { | ||
$('body').append('<ul id="blocks"></ul>'); | ||
|
||
// Add 10 list items to the list | ||
for (var i=1; i<=10; i++) | ||
$('#blocks').append('<li>' + i + '</li>'); | ||
}; | ||
var removeList = function() { | ||
$('#blocks').remove(); | ||
}; | ||
var scrollLeft = function(px) { | ||
px = px || $('#blocks')[0].scrollWidth; | ||
$('#blocks').scrollLeft(px); | ||
}; | ||
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before(buidList); | ||
after(removeList); | ||
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describe('when the first four items are visible', function() { | ||
it('should return the string "1 2 3 4" as a list of currently visible items', function() { | ||
runHorizontallyScrollingViewport().should.be.exactly('1 2 3 4'); | ||
}); | ||
}); | ||
describe('when we scroll the list left by 525px', function() { | ||
it('should return the string "4 5 6 7 8" as a list of currently visible items', function() { | ||
scrollLeft(525); | ||
runHorizontallyScrollingViewport().should.be.exactly('4 5 6 7 8'); | ||
}); | ||
}); | ||
describe('when we scroll the list to the end', function() { | ||
it('should return the string "7 8 9 10" as a list of currently visible items', function() { | ||
scrollLeft(); | ||
runHorizontallyScrollingViewport().should.be.exactly('7 8 9 10'); | ||
}); | ||
}); | ||
}); | ||
}); |
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