42 lines
1.2 KiB
JavaScript
42 lines
1.2 KiB
JavaScript
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// xWinScrollTo, Copyright 2003-2005 Michael Foster (Cross-Browser.com)
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// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL
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var xWinScrollWin = null;
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function xWinScrollTo(win,x,y,uTime) {
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var e = win;
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if (!e.timeout) e.timeout = 25;
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var st = xScrollTop(e, 1);
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var sl = xScrollLeft(e, 1);
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e.xTarget = x; e.yTarget = y; e.slideTime = uTime; e.stop = false;
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e.yA = e.yTarget - st;
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e.xA = e.xTarget - sl; // A = distance
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e.B = Math.PI / (2 * e.slideTime); // B = period
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e.yD = st;
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e.xD = sl; // D = initial position
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var d = new Date(); e.C = d.getTime();
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if (!e.moving) {
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xWinScrollWin = e;
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_xWinScrollTo();
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}
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}
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function _xWinScrollTo() {
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var e = xWinScrollWin || window;
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var now, s, t, newY, newX;
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now = new Date();
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t = now.getTime() - e.C;
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if (e.stop) { e.moving = false; }
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else if (t < e.slideTime) {
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setTimeout("_xWinScrollTo()", e.timeout);
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s = Math.sin(e.B * t);
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newX = Math.round(e.xA * s + e.xD);
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newY = Math.round(e.yA * s + e.yD);
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e.scrollTo(newX, newY);
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e.moving = true;
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}
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else {
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e.scrollTo(e.xTarget, e.yTarget);
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xWinScrollWin = null;
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e.moving = false;
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}
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}
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