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// @flow
import defineFunction from "../defineFunction";
import buildCommon from "../buildCommon";
import mathMLTree from "../mathMLTree";
import * as html from "../buildHTML";
import * as mml from "../buildMathML";
// \vcenter: Vertically center the argument group on the math axis.
defineFunction({
type: "vcenter",
names: ["\\vcenter"],
props: {
numArgs: 1,
argTypes: ["original"], // In LaTeX, \vcenter can act only on a box.
allowedInText: false,
},
handler({parser}, args) {
return {
type: "vcenter",
mode: parser.mode,
body: args[0],
};
},
htmlBuilder(group, options) {
const body = html.buildGroup(group.body, options);
const axisHeight = options.fontMetrics().axisHeight;
const dy = 0.5 * ((body.height - axisHeight) - (body.depth + axisHeight));
return buildCommon.makeVList({
positionType: "shift",
positionData: dy,
children: [{type: "elem", elem: body}],
}, options);
},
mathmlBuilder(group, options) {
// There is no way to do this in MathML.
// Write a class as a breadcrumb in case some post-processor wants
// to perform a vcenter adjustment.
return new mathMLTree.MathNode(
"mpadded", [mml.buildGroup(group.body, options)], ["vcenter"]);
},
});
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