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[TextLayer] Use an Array to build the total transform, rather than concatenating Strings, in expandTextDivs

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Furthermore, it's possible to re-use the same Array for all `textDiv`s on the page.
This commit is contained in:
Jonas Jenwald 2019-08-22 18:40:15 +02:00
parent 490deb1b65
commit 37e8a8189b
1 changed files with 12 additions and 10 deletions
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22
src/display/text_layer.js
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@ -626,6 +626,7 @@ var renderTextLayer = (function renderTextLayerClosure() {
expand(this);
this._bounds = null;
}
const transformBuf = [];
for (var i = 0, ii = this._textDivs.length; i < ii; i++) {
const div = this._textDivs[i];
@ -635,23 +636,24 @@ var renderTextLayer = (function renderTextLayerClosure() {
continue;
}
if (expandDivs) {
let transform = '', padding = '';
transformBuf.length = 0;
let padding = '';
if (divProps.scale !== 1) {
transform = `scaleX(${divProps.scale})`;
}
if (divProps.angle !== 0) {
transform = `rotate(${divProps.angle}deg) ${transform}`;
transformBuf.push(`rotate(${divProps.angle}deg)`);
}
if (divProps.scale !== 1) {
transformBuf.push(`scaleX(${divProps.scale})`);
}
if (divProps.paddingLeft !== 0) {
padding +=
` padding-left: ${divProps.paddingLeft / divProps.scale}px;`;
transform +=
` translateX(${-divProps.paddingLeft / divProps.scale}px)`;
transformBuf.push(
`translateX(${-divProps.paddingLeft / divProps.scale}px)`);
}
if (divProps.paddingTop !== 0) {
padding += ` padding-top: ${divProps.paddingTop}px;`;
transform += ` translateY(${-divProps.paddingTop}px)`;
transformBuf.push(`translateY(${-divProps.paddingTop}px)`);
}
if (divProps.paddingRight !== 0) {
padding +=
@ -664,8 +666,8 @@ var renderTextLayer = (function renderTextLayerClosure() {
if (padding !== '') {
div.setAttribute('style', divProps.style + padding);
}
if (transform !== '') {
div.style.transform = transform;
if (transformBuf.length) {
div.style.transform = transformBuf.join(' ');
}
} else {
div.style.padding = null;