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gecko-dev/layout/style/test/flexbox_layout_testcases.js

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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 sts=2 et: */
/*
* This Source Code is subject to the terms of the Mozilla Public License
* version 2.0 (the "License"). You can obtain a copy of the License at
* http://mozilla.org/MPL/2.0/.
*/
/**
* For the purposes of this test, flex items are specified as a hash with a
* hash-entry for each CSS property that is to be set. In these per-property
* entries, the key is the property-name, and the value can be either of the
* following:
* (a) the property's specified value
* ...or...
* (b) an array with 2 entries: [specifiedValue, expectedComputedValue] if the
* property's computed value is intended to be checked. The first entry
* (for the specified value) may be null; this means that no value should
* be explicitly specified for this property.
*
* To allow these testcases to be re-used in both horizontal and vertical
* flex containers, we specify "width"/"min-width"/etc. using the aliases
* "_main-size", "_min-main-size", etc. The test code can map these
* placeholder names to their corresponding property-names using the maps
* defined below -- gRowPropertyMapping, gColumnPropertyMapping, etc.
*
* If the testcase needs to customize its flex container at all (e.g. by
* specifying a custom container-size), it can do so by including a hash
* called "container_properties", with propertyName:propertyValue mappings.
* (This hash can use aliased property-names like "_main-size" as well.)
*/
// The standard main-size we'll use for our flex container when setting up
// the testcases defined below:
var gDefaultFlexContainerSize = "200px";
// Left-to-right versions of placeholder property-names used in
// testcases below:
var gRowPropertyMapping =
{
"_main-size": "width",
"_min-main-size": "min-width",
"_max-main-size": "max-width",
"_border-main-start-width": "border-left-width",
"_border-main-end-width": "border-right-width",
"_padding-main-start": "padding-left",
"_padding-main-end": "padding-right",
"_margin-main-start": "margin-left",
"_margin-main-end": "margin-right"
};
// Right-to-left versions of placeholder property-names used in
// testcases below:
var gRowReversePropertyMapping =
{
"_main-size": "width",
"_min-main-size": "min-width",
"_max-main-size": "max-width",
"_border-main-start-width": "border-right-width",
"_border-main-end-width": "border-left-width",
"_padding-main-start": "padding-right",
"_padding-main-end": "padding-left",
"_margin-main-start": "margin-right",
"_margin-main-end": "margin-left"
};
// Top-to-bottom versions of placeholder property-names used in
// testcases below:
var gColumnPropertyMapping =
{
"_main-size": "height",
"_min-main-size": "min-height",
"_max-main-size": "max-height",
"_border-main-start-width": "border-top-width",
"_border-main-end-width": "border-bottom-width",
"_padding-main-start": "padding-top",
"_padding-main-end": "padding-bottom",
"_margin-main-start": "margin-top",
"_margin-main-end": "margin-bottom"
};
// Bottom-to-top versions of placeholder property-names used in
// testcases below:
var gColumnReversePropertyMapping =
{
"_main-size": "height",
"_min-main-size": "min-height",
"_max-main-size": "max-height",
"_border-main-start-width": "border-bottom-width",
"_border-main-end-width": "border-top-width",
"_padding-main-start": "padding-bottom",
"_padding-main-end": "padding-top",
"_margin-main-start": "margin-bottom",
"_margin-main-end": "margin-top"
};
// The list of actual testcase definitions:
var gFlexboxTestcases =
[
// No flex properties specified --> should just use 'width' for sizing
{
items:
[
{ "_main-size": [ "40px", "40px" ] },
{ "_main-size": [ "65px", "65px" ] },
]
},
// flex-basis is specified:
{
items:
[
{ "flex-basis": "50px",
"_main-size": [ null, "50px" ]
},
{
"flex-basis": "20px",
"_main-size": [ null, "20px" ]
},
]
},
// flex-basis is *large* -- sum of flex-basis values is > flex container size:
// (w/ 0 flex-shrink so we don't shrink):
{
items:
[
{
"flex": "0 0 150px",
"_main-size": [ null, "150px" ]
},
{
"flex": "0 0 90px",
"_main-size": [ null, "90px" ]
},
]
},
// flex-basis is *large* -- each flex-basis value is > flex container size:
// (w/ 0 flex-shrink so we don't shrink):
{
items:
[
{
"flex": "0 0 250px",
"_main-size": [ null, "250px" ]
},
{
"flex": "0 0 400px",
"_main-size": [ null, "400px" ]
},
]
},
// flex-basis has percentage value:
{
items:
[
{
"flex-basis": "30%",
"_main-size": [ null, "60px" ]
},
{
"flex-basis": "45%",
"_main-size": [ null, "90px" ]
},
]
},
// flex-basis has calc(percentage) value:
{
items:
[
{
"flex-basis": "calc(20%)",
"_main-size": [ null, "40px" ]
},
{
"flex-basis": "calc(80%)",
"_main-size": [ null, "160px" ]
},
]
},
// flex-basis has calc(percentage +/- length) value:
{
items:
[
{
"flex-basis": "calc(10px + 20%)",
"_main-size": [ null, "50px" ]
},
{
"flex-basis": "calc(60% - 1px)",
"_main-size": [ null, "119px" ]
},
]
},
// flex-grow is specified:
{
items:
[
{
"flex": "1",
"_main-size": [ null, "60px" ]
},
{
"flex": "2",
"_main-size": [ null, "120px" ]
},
{
"flex": "0 20px",
"_main-size": [ null, "20px" ]
}
]
},
// Same ratio as prev. testcase; making sure we handle float inaccuracy
{
items:
[
{
"flex": "100000",
"_main-size": [ null, "60px" ]
},
{
"flex": "200000",
"_main-size": [ null, "120px" ]
},
{
"flex": "0.000001 20px",
"_main-size": [ null, "20px" ]
}
]
},
// Same ratio as prev. testcase, but with items cycled and w/
// "flex: none" & explicit size instead of "flex: 0 20px"
{
items:
[
{
"flex": "none",
"_main-size": [ "20px", "20px" ]
},
{
"flex": "1",
"_main-size": [ null, "60px" ]
},
{
"flex": "2",
"_main-size": [ null, "120px" ]
}
]
},
// ...and now with flex-grow:[huge] to be sure we handle infinite float values
// gracefully.
{
items:
[
{
"flex": "9999999999999999999999999999999999999999999999999999999",
"_main-size": [ null, "200px" ]
},
]
},
{
items:
[
{
"flex": "9999999999999999999999999999999999999999999999999999999",
"_main-size": [ null, "50px" ]
},
{
"flex": "9999999999999999999999999999999999999999999999999999999",
"_main-size": [ null, "50px" ]
},
{
"flex": "9999999999999999999999999999999999999999999999999999999",
"_main-size": [ null, "50px" ]
},
{
"flex": "9999999999999999999999999999999999999999999999999999999",
"_main-size": [ null, "50px" ]
},
]
},
{
items:
[
{
"flex": "99999999999999999999999999999999999",
"_main-size": [ null, "50px" ]
},
{
"flex": "99999999999999999999999999999999999",
"_main-size": [ null, "50px" ]
},
{
"flex": "99999999999999999999999999999999999",
"_main-size": [ null, "50px" ]
},
{
"flex": "99999999999999999999999999999999999",
"_main-size": [ null, "50px" ]
},
]
},
// And now, some testcases to check that we handle float accumulation error
// gracefully.
// First, a testcase with just a custom-sized huge container, to be sure we'll
// be able to handle content on that scale, in the subsequent more-complex
// testcases:
{
container_properties:
{
"_main-size": "9000000px"
},
items:
[
{
"flex": "1",
"_main-size": [ null, "9000000px" ]
},
]
},
// ...and now with two flex items dividing up that container's huge size:
{
container_properties:
{
"_main-size": "9000000px"
},
items:
[
{
"flex": "2",
"_main-size": [ null, "6000000px" ]
},
{
"flex": "1",
"_main-size": [ null, "3000000px" ]
},
]
},
// OK, now to actually test accumulation error. Below, we have six flex items
// splitting up the container's size, with huge differences between flex
// weights. For simplicity, I've set up the weights so that they sum exactly
// to the container's size in px. So 1 unit of flex *should* get you 1px.
//
// NOTE: The expected computed "_main-size" values for the flex items below
// appear to add up to more than their container's size, which would suggest
// that they overflow their container unnecessarily. But they don't actually
// overflow -- this discrepancy is simply because Gecko's code for reporting
// computed-sizes rounds to 6 significant figures (in particular, the method
// (nsTSubstring_CharT::AppendFloat() does this). Internally, in app-units,
// the child frames' main-sizes add up exactly to the container's main-size,
// as you'd hope & expect.
{
container_properties:
{
"_main-size": "9000000px"
},
items:
[
{
"flex": "3000000",
"_main-size": [ null, "3000000px" ]
},
{
"flex": "1",
"_main-size": [ null, "1px" ]
},
{
"flex": "1",
"_main-size": [ null, "1px" ]
},
{
"flex": "2999999",
// NOTE: Expected value is off slightly, from float error when
// resolving flexible lengths & when generating computed value string:
"_main-size": [ null, "3000000px" ]
},
{
"flex": "2999998",
// NOTE: Expected value is off slightly, from float error when
// resolving flexible lengths & when generating computed value string:
"_main-size": [ null, "3000000px" ]
},
{
"flex": "1",
"_main-size": [ null, "1px" ]
},
]
},
// Same flex items as previous testcase, but now reordered such that the items
// with tiny flex weights are all listed last:
{
container_properties:
{
"_main-size": "9000000px"
},
items:
[
{
"flex": "3000000",
"_main-size": [ null, "3000000px" ]
},
{
"flex": "2999999",
// NOTE: Expected value is off slightly, from float error when
// resolving flexible lengths & when generating computed value string:
"_main-size": [ null, "3000000px" ]
},
{
"flex": "2999998",
// NOTE: Expected value is off slightly, from float error when
// resolving flexible lengths & when generating computed value string:
"_main-size": [ null, "3000000px" ]
},
{
"flex": "1",
"_main-size": [ null, "1px" ]
},
{
"flex": "1",
"_main-size": [ null, "1px" ]
},
{
"flex": "1",
"_main-size": [ null, "1px" ]
},
]
},
// Same flex items as previous testcase, but now reordered such that the items
// with tiny flex weights are all listed first:
{
container_properties:
{
"_main-size": "9000000px"
},
items:
[
{
"flex": "1",
// NOTE: Expected value is off slightly, from float error when
// resolving flexible lengths:
"_main-size": [ null, "0.966667px" ]
},
{
"flex": "1",
// NOTE: Expected value is off slightly, from float error when
// resolving flexible lengths:
"_main-size": [ null, "0.983333px" ]
},
{
"flex": "1",
// NOTE: Expected value is off slightly, from float error when
// resolving flexible lengths:
"_main-size": [ null, "0.983333px" ]
},
{
"flex": "3000000",
"_main-size": [ null, "3000000px" ]
},
{
"flex": "2999999",
// NOTE: Expected value is off slightly, from float error when
// resolving flexible lengths & when generating computed value string:
"_main-size": [ null, "3000000px" ]
},
{
"flex": "2999998",
// NOTE: Expected value is off slightly, from float error when
// resolving flexible lengths & when generating computed value string:
"_main-size": [ null, "3000000px" ]
},
]
},
// Trying "flex: auto" (== "1 1 auto") w/ a mix of flex-grow/flex-basis values
{
items:
[
{
"flex": "auto",
"_main-size": [ null, "45px" ]
},
{
"flex": "2",
"_main-size": [ null, "90px" ]
},
{
"flex": "20px 1 0",
"_main-size": [ null, "65px" ]
}
]
},
// Same as previous, but with items cycled & different syntax
{
items:
[
{
"flex": "20px",
"_main-size": [ null, "65px" ]
},
{
"flex": "1",
"_main-size": [ null, "45px" ]
},
{
"flex": "2",
"_main-size": [ null, "90px" ]
}
]
},
{
items:
[
{
"flex": "2",
"_main-size": [ null, "100px" ],
"border": "0px dashed",
"_border-main-start-width": [ "5px", "5px" ],
"_border-main-end-width": [ "15px", "15px" ],
"_margin-main-start": [ "22px", "22px" ],
"_margin-main-end": [ "8px", "8px" ]
},
{
"flex": "1",
"_main-size": [ null, "50px" ],
"_margin-main-start": [ "auto", "0px" ],
"_padding-main-end": [ "auto", "0px" ],
}
]
},
// Test negative flexibility:
// Basic testcase: just 1 item (relying on initial "flex-shrink: 1") --
// should shrink to container size.
{
items:
[
{ "_main-size": [ "400px", "200px" ] },
],
},
// ...and now with a "flex" specification and a different flex-shrink value:
{
items:
[
{
"flex": "4 2 250px",
"_main-size": [ null, "200px" ]
},
],
},
// ...and now with multiple items, which all shrink proportionally (by 50%)
// to fit to the container, since they have the same (initial) flex-shrink val
{
items:
[
{ "_main-size": [ "80px", "40px" ] },
{ "_main-size": [ "40px", "20px" ] },
{ "_main-size": [ "30px", "15px" ] },
{ "_main-size": [ "250px", "125px" ] },
]
},
// ...and now with positive flexibility specified. (should have no effect, so
// everything still shrinks by the same proportion, since the flex-shrink
// values are all the same).
{
items:
[
{
"flex": "4 3 100px",
"_main-size": [ null, "80px" ]
},
{
"flex": "5 3 50px",
"_main-size": [ null, "40px" ]
},
{
"flex": "0 3 100px",
"_main-size": [ null, "80px" ]
}
]
},
// ...and now with *different* flex-shrink values:
{
items:
[
{
"flex": "4 2 50px",
"_main-size": [ null, "30px" ]
},
{
"flex": "5 3 50px",
"_main-size": [ null, "20px" ]
},
{
"flex": "0 0 150px",
"_main-size": [ null, "150px" ]
}
]
},
// Same ratio as prev. testcase; making sure we handle float inaccuracy
{
items:
[
{
"flex": "4 20000000 50px",
"_main-size": [ null, "30px" ]
},
{
"flex": "5 30000000 50px",
"_main-size": [ null, "20px" ]
},
{
"flex": "0 0.0000001 150px",
"_main-size": [ null, "150px" ]
}
]
},
// Another "different flex-shrink values" testcase:
{
items:
[
{
"flex": "4 2 115px",
"_main-size": [ null, "69px" ]
},
{
"flex": "5 1 150px",
"_main-size": [ null, "120px" ]
},
{
"flex": "1 4 30px",
"_main-size": [ null, "6px" ]
},
{
"flex": "1 0 5px",
"_main-size": [ null, "5px" ]
},
]
},
// ...and now with min-size (clamping the effects of flex-shrink on one item):
{
items:
[
{
"flex": "4 5 75px",
"_min-main-size": "50px",
"_main-size": [ null, "50px" ],
},
{
"flex": "5 5 100px",
"_main-size": [ null, "62.5px" ]
},
{
"flex": "0 4 125px",
"_main-size": [ null, "87.5px" ]
}
]
},
// Test a min-size that's much larger than initial preferred size, but small
// enough that our flexed size pushes us over it:
{
items:
[
{
"flex": "auto",
"_min-main-size": "110px",
"_main-size": [ "50px", "125px" ]
},
{
"flex": "auto",
"_main-size": [ null, "75px" ]
}
]
},
// Test a min-size that's much larger than initial preferred size, and is
// even larger than our positively-flexed size, so that we have to increase it
// (as a 'min violation') after we've flexed.
{
items:
[
{
"flex": "auto",
"_min-main-size": "150px",
"_main-size": [ "50px", "150px" ]
},
{
"flex": "auto",
"_main-size": [ null, "50px" ]
}
]
},
// Test min-size on multiple items simultaneously:
{
items:
[
{
"flex": "auto",
"_min-main-size": "20px",
"_main-size": [ null, "20px" ]
},
{
"flex": "9 auto",
"_min-main-size": "150px",
"_main-size": [ "50px", "180px" ]
},
]
},
{
items:
[
{
"flex": "1 1 0px",
"_min-main-size": "90px",
"_main-size": [ null, "90px" ]
},
{
"flex": "1 1 0px",
"_min-main-size": "80px",
"_main-size": [ null, "80px" ]
},
{
"flex": "1 1 40px",
"_main-size": [ null, "30px" ]
}
]
},
// Test a case where _min-main-size will be violated on different items in
// successive iterations of the "resolve the flexible lengths" loop
{
items:
[
{
"flex": "1 2 100px",
"_min-main-size": "90px",
"_main-size": [ null, "90px" ]
},
{
"flex": "1 1 100px",
"_min-main-size": "70px",
"_main-size": [ null, "70px" ]
},
{
"flex": "1 1 100px",
"_main-size": [ null, "40px" ]
}
]
},
// Test some cases that have a min-size violation on one item and a
// max-size violation on another:
// Here, both items initially grow to 100px. That violates both
// items' sizing constraints (it's smaller than the min-size and larger than
// the max-size), so we clamp both of them and sum the clamping-differences:
//
// (130px - 100px) + (50px - 100px) = (30px) + (-50px) = -20px
//
// This sum is negative, so (per spec) we freeze the item that had its
// max-size violated (the second one) and restart the algorithm. This time,
// all the available space (200px - 50px = 150px) goes to the not-yet-frozen
// first item, and that puts it above its min-size, so all is well.
{
items:
[
{
"flex": "auto",
"_min-main-size": "130px",
"_main-size": [ null, "150px" ]
},
{
"flex": "auto",
"_max-main-size": "50px",
"_main-size": [ null, "50px" ]
},
]
},
// As above, both items initially grow to 100px, and that violates both items'
// constraints. However, now the sum of the clamping differences is:
//
// (130px - 100px) + (80px - 100px) = (30px) + (-20px) = 10px
//
// This sum is positive, so (per spec) we freeze the item that had its
// min-size violated (the first one) and restart the algorithm. This time,
// all the available space (200px - 130px = 70px) goes to the not-yet-frozen
// second item, and that puts it below its max-size, so all is well.
{
items:
[
{
"flex": "auto",
"_min-main-size": "130px",
"_main-size": [ null, "130px" ]
},
{
"flex": "auto",
"_max-main-size": "80px",
"_main-size": [ null, "70px" ]
},
]
},
// As above, both items initially grow to 100px, and that violates both items'
// constraints. So we clamp both items and sum the clamping differences to
// see what to do next. The sum is:
//
// (80px - 100px) + (120px - 100px) = (-20px) + (20px) = 0px
//
// Per spec, if the sum is 0, we're done -- we leave both items at their
// clamped sizes.
{
items:
[
{
"flex": "auto",
"_max-main-size": "80px",
"_main-size": [ null, "80px" ]
},
{
"flex": "auto",
"_min-main-size": "120px",
"_main-size": [ null, "120px" ]
},
]
},
];
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