8000 [css-grid] Remove the Translated Layout Algorithm finally. · w3c/csswg-drafts@c6f2618 · GitHub
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[css-grid] Remove the Translated Layout Algorithm finally.
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‎css-grid/Overview.bs‎

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@@ -3869,178 +3869,3 @@ Changes</h2>
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A partial <a href="http://dev.w3.org/csswg/css-grid-1/issues-wd-20150805">Disposition of Comments</a> is available.
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See also <a href="http://www.w3.org/TR/2015/WD-css-grid-1-20150806/#changes">previous changes</a>.
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<h2 class="no-num" id="translated-algo">
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Appendix A: Translated Layout Algorithm</h2>
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Note: The following is a more direct translation of the
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<a href="http://www.w3.org/TR/2014/WD-css-grid-1-20140123/#track-sizing-algorithm">original Microsoft editors' track sizing algorithm</a>,
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from which the current algorithm is derived.
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It follows the original algorithm structure
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without being as programmatic in its language.
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It is preserved here to aid in review of the current specification
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(and will be removed in the next revision).
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This algorithm is run multiple times,
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once for each set of <a>grid items</a> with a particular <a>span count</a>,
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and each time it moves through four phases,
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each one addressing one combination of ''min-content'' or ''max-content''
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as a <a>min track sizing function</a> or <a>max track sizing function</a>.
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Starting from the set of all <a>grid items</a> in the grid,
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remove any with a <a>span count</a> greater than one
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which span a track with a <<flex>> <a>max track sizing function</a>.
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Of the remaining,
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sort them into groups according to their <a>span count</a>,
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and order the groups in ascending order of <a>span count</a>.
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For each group, in order,
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perform the following steps four times:
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<ol>
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<li>
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<b>Initialize variables</b>.
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Let each item's <dfn>needed space</dfn> be:
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<dl class="phase">
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<dt>In phase 1
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<dd>
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The min-content size of the item,
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minus the sum of the <a>base sizes</a> of the grid tracks it spans.
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<dt>In phase 2
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<dd>
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The max-content size of the item,
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minus the sum of the <a>base sizes</a> of the grid tracks it spans.
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<dt>In phase 3
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<dd>
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The min-content size of the item,
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minus the sum of the <a>growth limits</a> of the grid tracks it spans
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(or, if the <a>growth limit</a> is infinite, the <a>base size</a>).
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<dt>In phase 4
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<dd>
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The max-content size of the item,
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minus the sum of the <a>growth limits</a> of the grid tracks it spans
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(or, if the <a>growth limit</a> is infinite, the <a>base size</a>).
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</dl>
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Let each item's <dfn>growable tracks</dfn> be:
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<dl class="phase">
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<dt>In phase 1
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<dd>
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The grid tracks it spans with a ''min-content'' or ''max-content'' <a>min track sizing function</a>.
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<dt>In phase 2
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<dd>
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The grid tracks it spans with a ''max-content'' <a>min track sizing function</a>.
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<dt>In phase 3
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<dd>
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The grid tracks it spans with a ''min-content'' or ''max-content'' <a>max track sizing function</a>.
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<dt>In phase 4
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<dd>
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The grid tracks it spans with a ''max-content'' <a>max track sizing function</a>.
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</dl>
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Let each item's <dfn>overgrowable tracks</dfn> be:
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<dl class="phase">
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<dt>In phase 1
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<dd>
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The item's <a>growable tracks</a> that also have a ''min-content'' or ''max-content'' <a>max track sizing function</a>.
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If there are no such tracks,
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then it's all the <a>growable tracks</a>.
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<dt>In phase 2
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<dd>
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The item's <a>growable tracks</a> that also have a ''max-content'' <a>max track sizing function</a>.
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If there ar eno such tracks,
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then it's all the <a>growable tracks</a>.
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<dt>In phase 3
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<dt>In phase 4
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<dd>
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The item's <a>growable tracks</a>.
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</dl>
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Let each track's <dfn>growth delta</dfn> initially be zero.
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<li>
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<b>Calculate growth deltas.</b>
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For each grid item in the group:
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<ol>
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<li>
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<dl class="phase">
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<dt>In phase 1
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<dt>In phase 2
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<dd>
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Let each track's <dfn>hypothetical size</dfn>
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be the track's <a>base size</a>.
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<dt>In phase 3
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<dt>In phase 4
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<dd>
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Let each track's <a>hypothetical size</a>
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be the track's <a>growth limit</a> if it's finite,
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or else the track's <a>base size</a> otherwise.
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</dl>
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<li>
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Distribute the item's <a>needed space</a>
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as evenly as possible among the <a>hypothetical sizes</a> of the item's <a>growable tracks</a>,
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maxing each out as its <a>hypothetical size</a> reaches its <a>growth limit</a>.
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<dl class="phase">
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<dt>In phase 4
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<dd>
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If the track's <a>growth limit</a> was changed from infinite to a finite value
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in phase 3,
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treat its <a>growth limit</a> as infinite for the purposes of this step.
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</dl>
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<li>
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If all <a>growable tracks</a> reached their <a>growth limit</a> in the previous step
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and there is still <a>needed space</a> to distribute,
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distribute the leftover space evenly among the <a>hypothetical sizes</a> of the item's <a>overgrowable tracks</a>.
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<li>
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<dl class="phase">
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<dt>In phase 1
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<dt>In phase 2
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<dd>
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For each track,
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if the difference between its <a>hypothetical size</a> and its <a>base size</a>
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is greater than its <a>growth delta</a>,
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set its <a>growth delta</a> to that difference.
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<dt>In phase 3
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<dt>In phase 4
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<dd>
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For each track,
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if its <a>growth limit</a> is finite,
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and the difference between its <a>hypothetical size</a> and its <a>growth limit</a>
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is greater than its <a>growth delta</a>,
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set its <a>growth delta</a> to that difference.
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Otherwise, if its <a>growth limit</a> is infinite,
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and the difference between its <a>hypothetical size</a> and its <a>base size</a>
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is greater than its <a>growth delta</a>,
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set its <a>growth delta</a> to that difference.
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</dl>
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</ol>
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<li>
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<b>Adjust each track's affected size.</b>
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<dl class="phase">
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<dt>In phase 1
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<dt>In phase 2
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<dd>
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For each track,
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increase its <a>base size</a> by its <a>growth delta</a>.
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<dt>In phase 3
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<dt>In phase 4
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<dd>
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For each track,
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if its <a>growth limit</a> is finite,
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increase its <a>growth limit</a> by its <a>growth delta</a>.
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Otherwise, if its <a>growth limit</a> is infinite,
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set its <a>growth limit</a>
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to the sum of its <a>base size</a> and its <a>growth delta</a>.
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</dl>
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</ol>

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