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applications/htmlroot/overlib_followscroll.js view on Meta::CPAN
// Parses Shadow and Scroll commands
function parseScrollExtras(pf,i,ar) {
var k=i,v;
if (k < ar.length) {
if (ar[k]==FOLLOWSCROLL) { eval(pf +'followscroll=('+pf+'followscroll==0) ? 1 : 0'); return k; }
if (ar[k]==FOLLOWSCROLLREFRESH) { eval(pf+'followscrollrefresh='+ar[++k]); return k; }
}
return -1;
}
// Function to support scroll feature (overloads default)
function scroll_placeLayer() {
var placeX, placeY, widthFix = 0;
// HORIZONTAL PLACEMENT
if (o3_frame.innerWidth) {
widthFix=Math.ceil(1.2*(o3_frame.outerWidth - o3_frame.innerWidth));
widthFix = (widthFix > 50) ? 20 : widthFix;
iwidth=o3_frame.innerWidth;
} else if (eval('o3_frame.'+docRoot)&&eval("typeof o3_frame."+docRoot+".clientWidth=='number'")&&eval('o3_frame.'+docRoot+'.clientWidth'))
iwidth=eval('o3_frame.'+docRoot+'.clientWidth');
// Horizontal scroll offset
winoffset=(olIe4) ? eval('o3_frame.'+docRoot+'.scrollLeft') : o3_frame.pageXOffset;
placeX = runHook('horizontalPlacement',FCHAIN,iwidth,winoffset,widthFix);
// VERTICAL PLACEMENT
if (o3_frame.innerHeight) iheight=o3_frame.innerHeight;
else if (eval('o3_frame.'+docRoot)&&eval("typeof o3_frame."+docRoot+".clientHeight=='number'")&&eval('o3_frame.'+docRoot+'.clientHeight'))
iheight=eval('o3_frame.'+docRoot+'.clientHeight');
// Vertical scroll offset
scrolloffset=(olIe4) ? eval('o3_frame.'+docRoot+'.scrollTop') : o3_frame.pageYOffset;
placeY = runHook('verticalPlacement',FCHAIN,iheight,scrolloffset);
// Actually move the object.
repositionTo(over,placeX,placeY);
if (o3_followscroll && o3_sticky && (o3_relx || o3_rely) && (typeof o3_draggable == 'undefined' || !o3_draggable)) {
if (typeof over.scroller=='undefined' || over.scroller.canScroll) over.scroller = new Scroller(placeX-winoffset,placeY-scrolloffset,o3_followscrollrefresh);
}
}
///////
// SUPPORT ROUTINES FOR SCROLL FEATURE
///////
// Scroller constructor
function Scroller(X,Y,refresh) {
this.canScroll=0;
this.refresh=refresh;
this.x=X;
this.y=Y;
this.timer=setTimeout("repositionOver()",this.refresh);
}
// Removes the timer to stop replacing the layer.
function cancelScroll() {
if (!o3_followscroll || typeof over.scroller == 'undefined') return;
over.scroller.canScroll = 1;
if (over.scroller.timer) {
clearTimeout(over.scroller.timer);
over.scroller.timer=null;
}
}
// Find out how much we've scrolled.
function getPageScrollY() {
if (o3_frame.pageYOffset) return o3_frame.pageYOffset;
if (eval(docRoot)) return eval('o3_frame.' + docRoot + '.scrollTop');
return -1;
}
function getPageScrollX() {
if (o3_frame.pageXOffset) return o3_frame.pageXOffset;
if (eval(docRoot)) return eval('o3_frame.'+docRoot+'.scrollLeft');
return -1;
}
// Find out where our layer is
function getLayerTop(layer) {
if (layer.pageY) return layer.pageY;
if (layer.style.top) return parseInt(layer.style.top);
return -1;
}
function getLayerLeft(layer) {
if (layer.pageX) return layer.pageX;
if (layer.style.left) return parseInt(layer.style.left);
return -1;
}
// Repositions the layer if needed
function repositionOver() {
var X, Y, pgLeft, pgTop;
pgTop = getPageScrollY();
pgLeft = getPageScrollX();
X = getLayerLeft(over)-pgLeft;
Y = getLayerTop(over)-pgTop;
if (X != over.scroller.x || Y != over.scroller.y) repositionTo(over, pgLeft+over.scroller.x, pgTop+over.scroller.y);
over.scroller.timer = setTimeout("repositionOver()", over.scroller.refresh);
}
////////
// PLUGIN REGISTRATIONS
////////
registerRunTimeFunction(setScrollVariables);
registerCmdLineFunction(parseScrollExtras);
registerHook("hideObject",cancelScroll,FAFTER);
registerHook("placeLayer",scroll_placeLayer,FREPLACE);
if (olInfo.meets(4.10)) registerNoParameterCommands('followscroll');
}
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