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Fix #59

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Much more intelligent automatic scrolling
This commit is contained in:
Jeremy Ruston
2013-03-03 20:06:23 +00:00
parent fe69b169aa
commit 4c06bd72de
1 changed files with 23 additions and 8 deletions
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31
core/modules/utils/dom/scroller.js
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@@ -54,15 +54,30 @@ PageScroller.prototype.scrollIntoView = function(event) {
bounds.left += domNode.offsetLeft;
bounds.top += domNode.offsetTop;
}
// Now scroll the body
var scrollPosition = $tw.utils.getScrollPosition();
// Now get ready to scroll the body
this.cancelScroll();
this.startTime = new Date();
this.startX = scrollPosition.x;
this.startY = scrollPosition.y;
this.endX = bounds.left;
this.endY = bounds.top;
if((this.endX < this.startX) || (this.endX > (this.startX + window.innerWidth)) || (this.endY < this.startY) || (this.endY > (this.startY + window.innerHeight))) {
var scrollPosition = $tw.utils.getScrollPosition(),
// We'll consider the horizontal and vertical scroll directions separately via this function
getEndPos = function(targetPos,targetSize,currentPos,currentSize) {
// If the target is above/left of the current view, then scroll to it's top/left
if(targetPos <= currentPos) {
return targetPos;
// If the target is smaller than the window and the scroll position is too far up, then scroll till the target is at the bottom of the window
} else if(targetSize < currentSize && currentPos < (targetPos + targetSize - currentSize)) {
return targetPos + targetSize - currentSize;
// If the target is big, then just scroll to the top
} else if(currentPos < targetPos) {
return targetPos;
// Otherwise, stay where we are
} else {
return currentPos;
}
},
endX = getEndPos(bounds.left,bounds.width,scrollPosition.x,window.innerWidth),
endY = getEndPos(bounds.top,bounds.height,scrollPosition.y,window.innerHeight);
// Only scroll if necessary
if(endX !== scrollPosition.x || endY !== scrollPosition.y) {
var self = this;
this.timerId = window.setInterval(function() {
var t = ((new Date()) - self.startTime) / $tw.config.preferences.animationDuration;
@@ -71,7 +86,7 @@ PageScroller.prototype.scrollIntoView = function(event) {
t = 1;
}
t = $tw.utils.slowInSlowOut(t);
window.scrollTo(self.startX + (self.endX - self.startX) * t,self.startY + (self.endY - self.startY) * t);
window.scrollTo(scrollPosition.x + (endX - scrollPosition.x) * t,scrollPosition.y + (endY - scrollPosition.y) * t);
}, 10);
}
};