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Code Issues Releases Wiki Activity

Revised implementation of scrolling behaviour

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Now we use a "tw-scroll" event to request scrolling
This commit is contained in:
Jeremy Ruston
2012-11-26 16:08:52 +00:00
parent 515e0d9bf1
commit 0154b2a54e
5 changed files with 59 additions and 30 deletions
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core/modules/utils/dom/scroller.js
+22 -15
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@@ -13,12 +13,13 @@ Module that creates a $tw.utils.Scroller object prototype that manages scrolling
"use strict";
/*
Creates a Scroller object
Event handler for when the `tw-scroll` event hits the document body
*/
var Scroller = function() {
var PageScroller = function() {
this.timerId = null;
};
Scroller.prototype.cancel = function() {
PageScroller.prototype.cancelScroll = function() {
if(this.timerId) {
window.clearInterval(this.timerId);
this.timerId = null;
@@ -26,11 +27,22 @@ Scroller.prototype.cancel = function() {
};
/*
Smoothly scroll an tree node into view if needed
Handle an event
*/
Scroller.prototype.scrollIntoView = function(domNode) {
PageScroller.prototype.handleEvent = function(event) {
if(event.type === "tw-scroll") {
return this.handleScrollEvent(event);
}
return true;
};
/*
Handle a scroll event hitting the page document
*/
PageScroller.prototype.handleScrollEvent = function(event) {
// Get the offset bounds of the element
var bounds = {
var domNode = event.target,
bounds = {
left: domNode.offsetLeft,
top: domNode.offsetTop,
width: domNode.offsetWidth,
@@ -39,17 +51,12 @@ Scroller.prototype.scrollIntoView = function(domNode) {
// Walk up the tree adjusting the offset bounds by each offsetParent
while(domNode.offsetParent) {
domNode = domNode.offsetParent;
// If the node is scrollable, tell it to scroll
if(domNode.scrollTo) {
domNode.scrollTo(bounds);
return;
}
bounds.left += domNode.offsetLeft;
bounds.top += domNode.offsetTop;
}
// If we got to the top of the tree then we need to scroll the body
// Now scroll the body
var scrollPosition = $tw.utils.getScrollPosition();
this.cancel();
this.cancelScroll();
this.startTime = new Date();
this.startX = scrollPosition.x;
this.startY = scrollPosition.y;
@@ -60,7 +67,7 @@ Scroller.prototype.scrollIntoView = function(domNode) {
this.timerId = window.setInterval(function() {
var t = ((new Date()) - self.startTime) / $tw.config.preferences.animationDuration;
if(t >= 1) {
self.cancel();
self.cancelScroll();
t = 1;
}
t = $tw.utils.slowInSlowOut(t);
@@ -69,6 +76,6 @@ Scroller.prototype.scrollIntoView = function(domNode) {
}
};
exports.Scroller = Scroller;
exports.PageScroller = PageScroller;
})();