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Bug 805638 - Find parent node while the inner scrollable region reaches the end. r=vingtetun

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This commit is contained in:
Shih-Chiang Chien 2012-11-01 15:48:45 +08:00
parent 7c2606ae5f
commit 585436962e
1 changed files with 57 additions and 23 deletions
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80
dom/browser-element/BrowserElementScrolling.js
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@ -125,8 +125,18 @@ const ContentPanning = {
},
getPannable: function cp_getPannable(node) {
if (!(node instanceof Ci.nsIDOMHTMLElement) || node.tagName == 'HTML')
return [null, null];
let pannableNode = this._findPannable(node);
if (pannableNode) {
return [pannableNode, this._generateCallback(pannableNode)];
}
return [null, null];
},
_findPannable: function cp_findPannable(node) {
if (!(node instanceof Ci.nsIDOMHTMLElement) || node.tagName == 'HTML') {
return null;
}
let nodeContent = node.ownerDocument.defaultView;
while (!(node instanceof Ci.nsIDOMHTMLBodyElement)) {
@ -148,39 +158,63 @@ const ContentPanning = {
node.scrollWidth > node.clientWidth ||
('scrollLeftMax' in node && node.scrollLeftMax > 0) ||
('scrollTopMax' in node && node.scrollTopMax > 0)));
if (isScroll || isAuto || isScrollableTextarea)
return [node, this._generateCallback(node)];
if (isScroll || isAuto || isScrollableTextarea) {
return node;
}
node = node.parentNode;
}
if (ContentPanning._asyncPanZoomForViewportFrame &&
nodeContent === content)
// The parent context is asynchronously panning and zooming our
// root scrollable frame, so don't use our synchronous fallback.
return [null, null];
if (nodeContent.scrollMaxX || nodeContent.scrollMaxY) {
return [nodeContent, this._generateCallback(nodeContent)];
nodeContent === content) {
// The parent context is asynchronously panning and zooming our
// root scrollable frame, so don't use our synchronous fallback.
return null;
}
return [null, null];
if (nodeContent.scrollMaxX || nodeContent.scrollMaxY) {
return nodeContent;
}
return null;
},
_generateCallback: function cp_generateCallback(content) {
function scroll(delta) {
if (content instanceof Ci.nsIDOMHTMLElement) {
let oldX = content.scrollLeft, oldY = content.scrollTop;
content.scrollLeft += delta.x;
content.scrollTop += delta.y;
let newX = content.scrollLeft, newY = content.scrollTop;
return (newX != oldX) || (newY != oldY);
let firstScroll = true;
let target;
let isScrolling = false;
let oldX, oldY, newX, newY;
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;
return (newX != oldX || newY != oldY);
} else {
let oldX = content.scrollX, oldY = content.scrollY;
content.scrollBy(delta.x, delta.y);
let newX = content.scrollX, newY = content.scrollY;
return (newX != oldX) || (newY != oldY);
oldX = node.scrollX, oldY = node.scrollY;
node.scrollBy(delta.x, delta.y);
newX = node.scrollX, newY = node.scrollY;
return (newX != oldX || newY != oldY);
}
};
function scroll(delta) {
for (target = content; target;
target = ContentPanning._findPannable(target.parentNode)) {
isScrolling = doScroll(target, delta);
if (isScrolling || !firstScroll) {
break;
}
}
if (isScrolling) {
if (firstScroll) {
content = target; // set scrolling target to the first scrolling region
}
firstScroll = false; // lockdown the scrolling target after a success scrolling
}
return isScrolling;
}
return scroll;
},