зеркало из https://github.com/mozilla/gecko-dev.git
1397 строки
38 KiB
JavaScript
1397 строки
38 KiB
JavaScript
/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
|
|
/* vim: set ts=2 sw=2 sts=2 et: */
|
|
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one 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 (which indicates that we don't need to
|
|
* bother checking the computed value of this particular property)
|
|
* ...OR...
|
|
* (b) an array with 2-3 entries...
|
|
* [specifiedValue, expectedComputedValue (, epsilon) ]
|
|
* ...which indicates that the property's computed value should be
|
|
* checked. The array's first entry (for the specified value) may be
|
|
* null; this means that no value should be explicitly specified for this
|
|
* property. The second entry is the property's expected computed
|
|
* value. The third (optional) entry is an epsilon value, which allows for
|
|
* fuzzy equality when testing the computed value.
|
|
*
|
|
* 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", 0.2 ]
|
|
},
|
|
]
|
|
},
|
|
// 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", 0.2 ]
|
|
},
|
|
{
|
|
"flex": "1",
|
|
"_main-size": [ null, "1px", 0.2 ]
|
|
},
|
|
{
|
|
"flex": "1",
|
|
"_main-size": [ null, "1px", 0.2 ]
|
|
},
|
|
]
|
|
},
|
|
// 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, "1px", 0.2 ]
|
|
},
|
|
{
|
|
"flex": "1",
|
|
// NOTE: Expected value is off slightly, from float error when
|
|
// resolving flexible lengths:
|
|
"_main-size": [ null, "1px", 0.2 ]
|
|
},
|
|
{
|
|
"flex": "1",
|
|
// NOTE: Expected value is off slightly, from float error when
|
|
// resolving flexible lengths:
|
|
"_main-size": [ null, "1px", 0.2 ]
|
|
},
|
|
{
|
|
"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" ]
|
|
},
|
|
]
|
|
},
|
|
|
|
// Test cases where flex-grow sums to less than 1:
|
|
// ===============================================
|
|
// This makes us treat the flexibilities like "fraction of free space"
|
|
// instead of weights, so that e.g. a single item with "flex-grow: 0.1"
|
|
// will only get 10% of the free space instead of all of the free space.
|
|
|
|
// Basic cases where flex-grow sum is less than 1:
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.1 100px",
|
|
"_main-size": [ null, "110px" ] // +10% of free space
|
|
},
|
|
]
|
|
},
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.8 0px",
|
|
"_main-size": [ null, "160px" ] // +80% of free space
|
|
},
|
|
]
|
|
},
|
|
|
|
// ... and now with two flex items:
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.4 70px",
|
|
"_main-size": [ null, "110px" ] // +40% of free space
|
|
},
|
|
{
|
|
"flex": "0.2 30px",
|
|
"_main-size": [ null, "50px" ] // +20% of free space
|
|
},
|
|
]
|
|
},
|
|
|
|
// ...and now with max-size modifying how much free space one item can take:
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.4 70px",
|
|
"_main-size": [ null, "110px" ] // +40% of free space
|
|
},
|
|
{
|
|
"flex": "0.2 30px",
|
|
"_max-main-size": "35px",
|
|
"_main-size": [ null, "35px" ] // +20% free space, then clamped
|
|
},
|
|
]
|
|
},
|
|
// ...and now with a max-size smaller than our flex-basis:
|
|
// (This makes us freeze the second item right away, before we compute
|
|
// the initial free space.)
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.4 70px",
|
|
"_main-size": [ null, "118px" ] // +40% of 200px-70px-10px
|
|
},
|
|
{
|
|
"flex": "0.2 30px",
|
|
"_max-main-size": "10px",
|
|
"_main-size": [ null, "10px" ] // immediately frozen
|
|
},
|
|
]
|
|
},
|
|
// ...and now with a max-size and a huge flex-basis, such that we initially
|
|
// have negative free space, which makes the "% of [original] free space"
|
|
// calculations a bit more subtle. We set the "original free space" after
|
|
// we've clamped the second item (the first time the free space is positive).
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.4 70px",
|
|
"_main-size": [ null, "118px" ] // +40% of free space _after freezing
|
|
// the other item_
|
|
},
|
|
{
|
|
"flex": "0.2 150px",
|
|
"_max-main-size": "10px",
|
|
"_main-size": [ null, "10px" ] // clamped immediately
|
|
},
|
|
]
|
|
},
|
|
|
|
// Now with min-size modifying how much free space our items take:
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.4 70px",
|
|
"_main-size": [ null, "110px" ] // +40% of free space
|
|
},
|
|
{
|
|
"flex": "0.2 30px",
|
|
"_min-main-size": "70px",
|
|
"_main-size": [ null, "70px" ] // +20% free space, then clamped
|
|
},
|
|
]
|
|
},
|
|
|
|
// ...and now with a large enough min-size that it prevents the other flex
|
|
// item from taking its full desired portion of the original free space:
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.4 70px",
|
|
"_main-size": [ null, "80px" ] // (Can't take my full +40% of
|
|
// free space due to other item's
|
|
// large min-size.)
|
|
},
|
|
{
|
|
"flex": "0.2 30px",
|
|
"_min-main-size": "120px",
|
|
"_main-size": [ null, "120px" ] // +20% free space, then clamped
|
|
},
|
|
]
|
|
},
|
|
// ...and now with a large-enough min-size that it pushes the other flex item
|
|
// to actually shrink a bit (with default "flex-shrink:1"):
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.3 30px",
|
|
"_main-size": [ null, "20px" ] // -10px, instead of desired +45px
|
|
},
|
|
{
|
|
"flex": "0.2 20px",
|
|
"_min-main-size": "180px",
|
|
"_main-size": [ null, "180px" ] // +160px, instead of desired +30px
|
|
},
|
|
]
|
|
},
|
|
|
|
// In this case, the items' flexibilities don't initially sum to < 1, but they
|
|
// do after we freeze the third item for violating its max-size.
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.3 30px",
|
|
"_main-size": [ null, "75px" ]
|
|
// 1st loop: desires (0.3 / 5) * 150px = 9px. Tentatively granted.
|
|
// 2nd loop: desires 0.3 * 150px = 45px. Tentatively granted.
|
|
// 3rd loop: desires 0.3 * 150px = 45px. Granted +45px.
|
|
},
|
|
{
|
|
"flex": "0.2 20px",
|
|
"_max-main-size": "30px",
|
|
"_main-size": [ null, "30px" ]
|
|
// First loop: desires (0.2 / 5) * 150px = 6px. Tentatively granted.
|
|
// Second loop: desires 0.2 * 150px = 30px. Frozen at +10px.
|
|
},
|
|
{
|
|
"flex": "4.5 0px",
|
|
"_max-main-size": "20px",
|
|
"_main-size": [ null, "20px" ]
|
|
// First loop: desires (4.5 / 5) * 150px = 135px. Frozen at +20px.
|
|
},
|
|
]
|
|
},
|
|
|
|
// Make sure we calculate "original free space" correctly when one of our
|
|
// flex items will be clamped right away, due to max-size preventing it from
|
|
// growing at all:
|
|
{
|
|
// Here, the second flex item is effectively inflexible; it's
|
|
// immediately frozen at 40px since we're growing & this item's max size
|
|
// trivially prevents it from growing. This leaves us with an "original
|
|
// free space" of 60px. The first flex item takes half of that, due to
|
|
// its flex-grow value of 0.5.
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.5 100px",
|
|
"_main-size": [ null, "130px" ]
|
|
},
|
|
{
|
|
"flex": "1 98px",
|
|
"_max-main-size": "40px",
|
|
"_main-size": [ null, "40px" ]
|
|
},
|
|
]
|
|
},
|
|
{
|
|
// Same as previous example, but with a larger flex-basis on the second
|
|
// element (which shouldn't ultimately matter, because its max size clamps
|
|
// its size immediately anyway).
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.5 100px",
|
|
"_main-size": [ null, "130px" ]
|
|
},
|
|
{
|
|
"flex": "1 101px",
|
|
"_max-main-size": "40px",
|
|
"_main-size": [ null, "40px" ]
|
|
},
|
|
]
|
|
},
|
|
|
|
{
|
|
// Here, the third flex item is effectively inflexible; it's immediately
|
|
// frozen at 0px since we're growing & this item's max size trivially
|
|
// prevents it from growing. This leaves us with an "original free space" of
|
|
// 100px. The first flex item takes 40px, and the third takes 50px, due to
|
|
// their flex values of 0.4 and 0.5.
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.4 50px",
|
|
"_main-size": [ null, "90px" ]
|
|
},
|
|
{
|
|
"flex": "0.5 50px",
|
|
"_main-size": [ null, "100px" ]
|
|
},
|
|
{
|
|
"flex": "0 90px",
|
|
"_max-main-size": "0px",
|
|
"_main-size": [ null, "0px" ]
|
|
},
|
|
]
|
|
},
|
|
{
|
|
// Same as previous example, but with slightly larger flex-grow values on
|
|
// the first and second items, which sum to 1.0 and produce slightly larger
|
|
// main sizes. This demonstrates that there's no discontinuity between the
|
|
// "< 1.0 sum" to ">= 1.0 sum" behavior, in this situation at least.
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0.45 50px",
|
|
"_main-size": [ null, "95px" ]
|
|
},
|
|
{
|
|
"flex": "0.55 50px",
|
|
"_main-size": [ null, "105px" ]
|
|
},
|
|
{
|
|
"flex": "0 90px",
|
|
"_max-main-size": "0px",
|
|
"_main-size": [ null, "0px" ]
|
|
},
|
|
]
|
|
},
|
|
|
|
// Test cases where flex-shrink sums to less than 1:
|
|
// =================================================
|
|
// This makes us treat the flexibilities more like "fraction of (negative)
|
|
// free space" instead of weights, so that e.g. a single item with
|
|
// "flex-shrink: 0.1" will only shrink by 10% of amount that it overflows
|
|
// its container by.
|
|
//
|
|
// It gets a bit more complex when there are multiple flex items, because
|
|
// flex-shrink is scaled by the flex-basis before it's used as a weight. But
|
|
// even with that scaling, the general principal is that e.g. if the
|
|
// flex-shrink values *sum* to 0.6, then the items will collectively only
|
|
// shrink by 60% (and hence will still overflow).
|
|
|
|
// Basic cases where flex-grow sum is less than 1:
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0 0.1 300px",
|
|
"_main-size": [ null, "290px" ] // +10% of (negative) free space
|
|
},
|
|
]
|
|
},
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0 0.8 400px",
|
|
"_main-size": [ null, "240px" ] // +80% of (negative) free space
|
|
},
|
|
]
|
|
},
|
|
|
|
// ...now with two flex items, with the same flex-basis value:
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0 0.4 150px",
|
|
"_main-size": [ null, "110px" ] // +40% of (negative) free space
|
|
},
|
|
{
|
|
"flex": "0 0.2 150px",
|
|
"_main-size": [ null, "130px" ] // +20% of (negative) free space
|
|
},
|
|
]
|
|
},
|
|
|
|
// ...now with two flex items, with different flex-basis values (and hence
|
|
// differently-scaled flex factors):
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0 0.3 100px",
|
|
"_main-size": [ null, "76px" ]
|
|
},
|
|
{
|
|
"flex": "0 0.1 200px",
|
|
"_main-size": [ null, "184px" ]
|
|
}
|
|
]
|
|
// Notes:
|
|
// - Free space: -100px
|
|
// - Sum of flex-shrink factors: 0.3 + 0.1 = 0.4
|
|
// - Since that sum ^ is < 1, we'll only distribute that fraction of
|
|
// the free space. We'll distribute: -100px * 0.4 = -40px
|
|
//
|
|
// - 1st item's scaled flex factor: 0.3 * 100px = 30
|
|
// - 2nd item's scaled flex factor: 0.1 * 200px = 20
|
|
// - 1st item's share of distributed free space: 30/(30+20) = 60%
|
|
// - 2nd item's share of distributed free space: 20/(30+20) = 40%
|
|
//
|
|
// SO:
|
|
// - 1st item gets 60% * -40px = -24px. 100px-24px = 76px
|
|
// - 2nd item gets 40% * -40px = -16px. 200px-16px = 184px
|
|
},
|
|
|
|
// ...now with min-size modifying how much one item can shrink:
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0 0.3 100px",
|
|
"_main-size": [ null, "70px" ]
|
|
},
|
|
{
|
|
"flex": "0 0.1 200px",
|
|
"_min-main-size": "190px",
|
|
"_main-size": [ null, "190px" ]
|
|
}
|
|
]
|
|
// Notes:
|
|
// - We proceed as in previous testcase, but clamp the second flex item
|
|
// at its min main size.
|
|
// - After that point, we have a total flex-shrink of = 0.3, so we
|
|
// distribute 0.3 * -100px = -30px to the remaining unfrozen flex
|
|
// items. Since there's only one unfrozen item left, it gets all of it.
|
|
},
|
|
|
|
// ...now with min-size larger than our flex-basis:
|
|
// (This makes us freeze the second item right away, before we compute
|
|
// the initial free space.)
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0 0.3 100px",
|
|
"_main-size": [ null, "55px" ] // +30% of 200px-100px-250px
|
|
},
|
|
{
|
|
"flex": "0 0.1 200px",
|
|
"_min-main-size": "250px",
|
|
"_main-size": [ null, "250px" ] // immediately frozen
|
|
}
|
|
]
|
|
// (Same as previous example, except the min-main-size prevents the
|
|
// second item from shrinking at all)
|
|
},
|
|
|
|
// ...and now with a min-size and a small flex-basis, such that we initially
|
|
// have positive free space, which makes the "% of [original] free space"
|
|
// calculations a bit more subtle. We set the "original free space" after
|
|
// we've clamped the second item (the first time the free space is negative).
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0 0.3 100px",
|
|
"_main-size": [ null, "70px" ]
|
|
},
|
|
{
|
|
"flex": "0 0.1 50px",
|
|
"_min-main-size": "200px",
|
|
"_main-size": [ null, "200px" ]
|
|
}
|
|
]
|
|
},
|
|
|
|
// Now with max-size making an item shrink more than its flex-shrink value
|
|
// calls for:
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0 0.3 100px",
|
|
"_main-size": [ null, "70px" ]
|
|
},
|
|
{
|
|
"flex": "0 0.1 200px",
|
|
"_max-main-size": "150px",
|
|
"_main-size": [ null, "150px" ]
|
|
}
|
|
]
|
|
// Notes:
|
|
// - We proceed as in an earlier testcase, but clamp the second flex item
|
|
// at its max main size.
|
|
// - After that point, we have a total flex-shrink of = 0.3, so we
|
|
// distribute 0.3 * -100px = -30px to the remaining unfrozen flex
|
|
// items. Since there's only one unfrozen item left, it gets all of it.
|
|
},
|
|
|
|
// ...and now with a small enough max-size that it prevents the other flex
|
|
// item from taking its full desired portion of the (negative) original free
|
|
// space:
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0 0.3 100px",
|
|
"_main-size": [ null, "90px" ]
|
|
},
|
|
{
|
|
"flex": "0 0.1 200px",
|
|
"_max-main-size": "110px",
|
|
"_main-size": [ null, "110px" ]
|
|
}
|
|
]
|
|
// Notes:
|
|
// - We proceed as in an earlier testcase, but clamp the second flex item
|
|
// at its max main size.
|
|
// - After that point, we have a total flex-shrink of 0.3, which would
|
|
// have us distribute 0.3 * -100px = -30px to the (one) remaining
|
|
// unfrozen flex item. But our remaining free space is only -10px at
|
|
// that point, so we distribute that instead.
|
|
},
|
|
|
|
// ...and now with a small enough max-size that it pushes the other flex item
|
|
// to actually grow a bit (with custom "flex-grow: 1" for this testcase):
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "1 0.3 100px",
|
|
"_main-size": [ null, "120px" ]
|
|
},
|
|
{
|
|
"flex": "1 0.1 200px",
|
|
"_max-main-size": "80px",
|
|
"_main-size": [ null, "80px" ]
|
|
}
|
|
]
|
|
},
|
|
|
|
// In this case, the items' flexibilities don't initially sum to < 1, but they
|
|
// do after we freeze the third item for violating its min-size.
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0 0.3 100px",
|
|
"_main-size": [ null, "76px" ]
|
|
},
|
|
{
|
|
"flex": "0 0.1 150px",
|
|
"_main-size": [ null, "138px" ]
|
|
},
|
|
{
|
|
"flex": "0 0.8 10px",
|
|
"_min-main-size": "40px",
|
|
"_main-size": [ null, "40px" ]
|
|
}
|
|
]
|
|
// Notes:
|
|
// - We immediately freeze the 3rd item, since we're shrinking and its
|
|
// min size obviously prevents it from shrinking at all. This leaves
|
|
// 200px - 100px - 150px - 40px = -90px of "initial free space".
|
|
//
|
|
// - Our remaining flexible items have a total flex-shrink of 0.4,
|
|
// so we can distribute a total of 0.4 * -90px = -36px
|
|
//
|
|
// - We distribute that space using *scaled* flex factors:
|
|
// * 1st item's scaled flex factor: 0.3 * 100px = 30
|
|
// * 2nd item's scaled flex factor: 0.1 * 150px = 15
|
|
// ...which means...
|
|
// * 1st item's share of distributed free space: 30/(30+15) = 2/3
|
|
// * 2nd item's share of distributed free space: 15/(30+15) = 1/3
|
|
//
|
|
// SO:
|
|
// - 1st item gets 2/3 * -36px = -24px. 100px - 24px = 76px
|
|
// - 2nd item gets 1/3 * -36px = -12px. 150px - 12px = 138px
|
|
},
|
|
|
|
// In this case, the items' flexibilities sum to > 1, in part due to an item
|
|
// that *can't actually shrink* due to its 0 flex-basis (which gives it a
|
|
// "scaled flex factor" of 0). This prevents us from triggering the special
|
|
// behavior for flexibilities that sum to less than 1, and as a result, the
|
|
// first item ends up absorbing all of the free space.
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0 .5 300px",
|
|
"_main-size": [ null, "200px" ]
|
|
},
|
|
{
|
|
"flex": "0 5 0px",
|
|
"_main-size": [ null, "0px" ]
|
|
}
|
|
]
|
|
},
|
|
|
|
// This case is similar to the one above, but with a *barely* nonzero base
|
|
// size for the second item. This should produce a result similar to the case
|
|
// above. (In particular, we should first distribute a very small amount of
|
|
// negative free space to the second item, getting it to approximately zero,
|
|
// and distribute the bulk of the negative free space to the first item,
|
|
// getting it to approximately 200px.)
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0 .5 300px",
|
|
"_main-size": [ null, "200px" ]
|
|
},
|
|
{
|
|
"flex": "0 1 0.01px",
|
|
"_main-size": [ null, "0px" ]
|
|
}
|
|
]
|
|
},
|
|
// This case is similar to the ones above, but now we've increased the
|
|
// flex-shrink value on the second-item so that it claims enough of the
|
|
// negative free space to go below its min-size (0px). So, it triggers a min
|
|
// violation & is frozen. For the loop *after* the min violation, the sum of
|
|
// the remaining flex items' flex-shrink values is less than 1, so we trigger
|
|
// the special <1 behavior and only distribute half of the remaining
|
|
// (negative) free space to the first item (instead of all of it).
|
|
{
|
|
items:
|
|
[
|
|
{
|
|
"flex": "0 .5 300px",
|
|
"_main-size": [ null, "250px" ]
|
|
},
|
|
{
|
|
"flex": "0 5 0.01px",
|
|
"_main-size": [ null, "0px" ]
|
|
}
|
|
]
|
|
},
|
|
];
|