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Bug 864684 - Prevent two way scrolling if it is not neccessary. r=vingtetun

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This commit is contained in:
Jinho Hwang 2013-04-26 16:50:12 -04:00
parent 8509113b9f
commit 5249447d5e
1 changed files with 11 additions and 4 deletions
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15
dom/browser-element/BrowserElementPanning.js
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@ -371,13 +371,20 @@ const ContentPanning = {
let isScrolling = false;
let oldX, oldY, newX, newY;
let win, doc, htmlNode, bodyNode;
let xScrollable = content.scrollWidth > content.clientWidth;
let yScrollable = content.scrollHeight > content.clientHeight;
function doScroll(node, delta) {
if (node instanceof Ci.nsIDOMHTMLElement) {
oldX = node.scrollLeft, oldY = node.scrollTop;
node.scrollLeft += delta.x;
node.scrollTop += delta.y;
newX = node.scrollLeft, newY = node.scrollTop;
newX = oldX = node.scrollLeft, newY = oldY = node.scrollTop;
if (xScrollable) {
node.scrollLeft += delta.x;
newX = node.scrollLeft;
}
if (yScrollable) {
node.scrollTop += delta.y;
newY = node.scrollTop;
}
return (newX != oldX || newY != oldY);
} else if (node instanceof Ci.nsIDOMWindow) {
win = node;