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Fixes #4228 Performance degradation for long pads 

Due to layout trashing when calculating new heights
ci-for-line-numbers
Sebastian Castro 2020-09-08 10:10:11 +02:00
parent 8213cb7341
commit c6dead9e46
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GPG Key ID: 1529B5349211A859
1 changed files with 49 additions and 59 deletions
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90
src/static/js/ace2_inner.js
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@ -5224,53 +5224,53 @@ function Ace2Inner(){
$(sideDiv).addClass("sidediv");
}
// We apply the height of a line in the doc body, to the corresponding sidediv line number
function updateLineNumbers()
{
var newNumLines = rep.lines.length();
if (newNumLines < 1) newNumLines = 1;
//update height of all current line numbers
if (!currentCallStack || currentCallStack && !currentCallStack.domClean) return;
var a = sideDivInner.firstChild;
var b = doc.body.firstChild;
var n = 0;
// Refs #4228, to avoid layout trashing, we need to first calculate all the heights,
// and then apply at once all new height to div elements
var lineHeights = [];
var docLine = doc.body.firstChild;
var currentLine = 0;
var h = null;
if (currentCallStack && currentCallStack.domClean)
// First loop to calculate the heights from doc body
while (docLine)
{
while (a && b)
{
if(n > lineNumbersShown) //all updated, break
break;
var h = (b.clientHeight || b.offsetHeight);
if (b.nextSibling)
{
// when text is zoomed in mozilla, divs have fractional
// heights (though the properties are always integers)
// and the line-numbers don't line up unless we pay
// attention to where the divs are actually placed...
// (also: padding on TTs/SPANs in IE...)
if (b === doc.body.firstChild) {
if (docLine.nextSibling) {
if (currentLine === 0) {
// It's the first line. For line number alignment purposes, its
// height is taken to be the top offset of the next line. If we
// didn't do this special case, we would miss out on any top margin
// included on the first line. The default stylesheet doesn't add
// extra margins/padding, but plugins might.
h = b.nextSibling.offsetTop - parseInt(window.getComputedStyle(doc.body).getPropertyValue("padding-top").split('px')[0]);
h = docLine.nextSibling.offsetTop - parseInt(window.getComputedStyle(doc.body).getPropertyValue("padding-top").split('px')[0]);
} else {
h = b.nextSibling.offsetTop - b.offsetTop;
h = docLine.nextSibling.offsetTop - docLine.offsetTop;
}
} else {
// last line
h = (docLine.clientHeight || docLine.offsetHeight);
}
if (h)
{
var hpx = h + "px";
if (a.style.height != hpx) {
a.style.height = hpx;
lineHeights.push(h)
docLine = docLine.nextSibling;
currentLine++;
}
var newNumLines = rep.lines.length();
if (newNumLines < 1) newNumLines = 1;
var sidebarLine = sideDivInner.firstChild;
// Apply height to existing sidediv lines
currentLine = 0
while (sidebarLine && currentLine <= lineNumbersShown) {
if (lineHeights[currentLine]) {
sidebarLine.style.height = lineHeights[currentLine] + "px";
}
a = a.nextSibling;
b = b.nextSibling;
n++;
}
sidebarLine = sidebarLine.nextSibling;
currentLine++;
}
if (newNumLines != lineNumbersShown)
@ -5278,32 +5278,22 @@ function Ace2Inner(){
var container = sideDivInner;
var odoc = outerWin.document;
var fragment = odoc.createDocumentFragment();
// Create missing line and apply height
while (lineNumbersShown < newNumLines)
{
lineNumbersShown++;
var n = lineNumbersShown;
var div = odoc.createElement("DIV");
//calculate height for new line number
if(b){
var h = (b.clientHeight || b.offsetHeight);
if (b.nextSibling){
h = b.nextSibling.offsetTop - b.offsetTop;
if (lineHeights[currentLine]) {
div.style.height = lineHeights[currentLine] +"px";
}
}
if(h){ // apply style to div
div.style.height = h +"px";
}
$(div).append($("<span class='line-number'>" + String(n) + "</span>"));
$(div).append($("<span class='line-number'>" + String(lineNumbersShown) + "</span>"));
fragment.appendChild(div);
if(b){
b = b.nextSibling;
currentLine++;
}
}
container.appendChild(fragment);
// Remove extra lines
while (lineNumbersShown > newNumLines)
{
container.removeChild(container.lastChild);