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Using addEventListener/removeEventListener

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This commit is contained in:
Artur Adib 2012-01-12 09:16:03 -05:00
parent fcdf266d8e
commit 504d9f12c1
1 changed files with 16 additions and 17 deletions
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33
web/viewer.js
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@ -962,9 +962,11 @@ var TextLayerBuilder = function textLayerBuilder(textLayerDiv) {
var textLayerDiv = this.textLayerDiv;
var renderTimer = null;
var renderingDone = false;
var renderInterval = 0;
var resumeInterval = 500; // in ms
// Render the text layer, one div at a time
var renderTextLayer = function textLayerRender() {
function renderTextLayer() {
if (textDivs.length === 0) {
clearInterval(renderTimer);
renderingDone = true;
@ -980,21 +982,16 @@ var TextLayerBuilder = function textLayerBuilder(textLayerDiv) {
(textDiv.dataset.textLength - 1)) + 'px';
}
}
renderTimer = setInterval(renderTextLayer, 0);
var scrollTimer = null;
if (window.onscroll)
var oldScrollHandler = window.onscroll;
renderTimer = setInterval(renderTextLayer, renderInterval);
// Stop rendering when user scrolls. Resume after XXX milliseconds
// of no scroll events
window.onscroll = function textLayerOnScroll() {
if (oldScrollHandler)
oldScrollHandler.apply(window, arguments);
// This avoids handler wrapper bloat
if (renderingDone)
window.onscroll = oldScrollHandler;
var scrollTimer = null;
function textLayerOnScroll() {
if (renderingDone) {
window.removeEventListener('scroll', textLayerOnScroll, false);
return;
}
// Immediately pause rendering
clearInterval(renderTimer);
@ -1002,10 +999,12 @@ var TextLayerBuilder = function textLayerBuilder(textLayerDiv) {
clearTimeout(scrollTimer);
scrollTimer = setTimeout(function() {
// Resume rendering
renderTimer = setInterval(renderTextLayer, 0);
}, 500);
}
};
renderTimer = setInterval(renderTextLayer, renderInterval);
}, resumeInterval);
}; // textLayerOnScroll
window.addEventListener('scroll', textLayerOnScroll, false);
}; // endLayout
this.appendText = function textLayerBuilderAppendText(text,
fontName, fontSize) {