| <![CDATA[
/*
* newsbox.js, by angus@netscape.com
* No formal support offered.
*/
function swapBox(ref) {
/*
This function is called to swap the "clone" tape with the "real" tape.
It is called whenever the active tape is about to run out.
See docs for more info on this concept.
*/
if (ref.activeBox == ref.boxLayer) {
ref.activeBox = ref.boxLayerSub;
ref.nonActiveBox = ref.boxLayer;
return true;
}
ref.activeBox=ref.boxLayer;
ref.nonActiveBox=ref.boxLayerSub;
return true;
}
function slideBox(ref,inc) {
/*
This function is called using setInterval. It slides the ticker ever so
slightly in each iteration. It performs checks to see if it should be
swapping the tape, and it also performs checks to make sure that it has
the "backup" tape on the correct side of the "active" tape, in case the
user switches gears by sliding the tape in the opposite direction.
*/
ref.boxLayer.moveBy(0,inc);
ref.boxLayerSub.moveBy(0,inc);
if ((ref.activeBox.top < (ref.activeBox.clip.height*-1)) && (ref.velocity<0)) {
ref.activeBox.moveBy(0,ref.activeBox.clip.height*2);
swapBox(ref);
}
if ((ref.activeBox.top > ref.activeBox.clip.height) && (ref.velocity>0)) {
ref.activeBox.moveBy(0,ref.realWidth*-2);
swapBox(ref);
}
if ((ref.velocity>0)&&(ref.activeBox.top>0) &&
(ref.nonActiveBox.top > (ref.activeBox.top-ref.activeBox.clip.height))) {
ref.nonActiveBox.moveTo(0,ref.activeBox.top-ref.activeBox.clip.height);
}
if ((ref.velocity<0)&&(ref.activeBox.top<(0-ref.activeBox.clip.height+ref.height)) &&
(ref.nonActiveBox.top < (ref.activeBox.top+ref.activeBox.clip.height))) {
ref.nonActiveBox.moveTo(0,ref.activeBox.top+ref.activeBox.clip.height);
}
}
function startBox() {
/*
this is the Ticker.start() method. It checks to make sure the user hasn't placed
the ticker into stop mode before starting (because this is called from mouseover
events also). It then optimizes the interval time difference and the movement per
iteration to work out so that slideTicker is called every 15 or more seconds (this
is to avoid really short timeout periods). It then fires off an interval to start
the motion.
*/
ref = this;
if (!ref.velocity) ref=this.parent;
if (ref.active) ref.stop();
if (ref.stopped == true) return(false);
var increment = 1000/Math.abs(ref.velocity);
var amount = ref.velocity/Math.abs(ref.velocity);
while (increment < 25) {
amount *=2;
increment *=2;
}
ref.active = setInterval(slideBox,increment,ref,amount);
return(true);
}
function stopBox() {
clearInterval(this.active);
}
function boxSlowVelocity(e) {
/*
Called whenever the mouse goes over the ticker tape. Stops the ticker,
reduces velocity to 50%, and restarts the ticker. Only does this if the
ticker motion is currently active. (Ticker.active is the interval ID)
Routes off the event if its happening over an anchor.
*/
if (e.target.constructor == window.Url) return routeEvent(e);
if (this.parent.active) {
this.parent.stop();
this.parent.velocity *= .5;
this.parent.start();
return true;
}
}
function boxSpeedVelocity(e) {
/*
Called whenever the mouse goes out of the ticker tape. Stops the ticker,
increases velocity back up to 100%, and restarts the ticker. Only does this if the
ticker motion is currently active. (Ticker.active is the interval ID)
Routes off the event if its happening over an anchor.
*/
if (e.target.constructor == window.Url) return routeEvent(e);
if (this.parent.active) {
this.parent.stop();
this.parent.velocity *= 2;
this.parent.start();
return true;
}
}
function makeSubBox() {
/*
Called in the Ticker constructor phase, this creates the initial "clone"
tape by instantiating a new layer.
*/
ref = this.parent;
ref.boxLayerSub = new Layer(ref.width,ref.container);
if (ref.velocity < 0) ref.boxLayerSub.top=ref.height;
if (ref.velocity > 0) ref.boxLayerSub.top=ref.height*-1;
ref.boxLayerSub.top=0;
ref.boxLayerSub.clip.width = ref.width;
ref.boxLayerSub.visibility="inherit";
ref.boxLayerSub.src=ref.src;
ref.boxLayerSub.onMouseOver = boxSlowVelocity;
ref.boxLayerSub.onMouseOut = boxSpeedVelocity;
ref.boxLayerSub.parent = ref;
ref.nonActiveBox = ref.boxLayerSub;
ref.boxLayerSub.onLoad=ref.start;
}
function makeBox(ref) {
/*
Called in the Ticker constructor phase, this creates the initial "active"
tape by instantiating a new layer.
*/
ref.boxLayer = new Layer(ref.width,ref.container);
ref.boxLayer.left=0;
ref.boxLayer.top=0;
ref.boxLayer.clip.width = ref.width;
ref.boxLayer.visibility="inherit";
ref.boxLayer.src=ref.src;
ref.activeBox = ref.boxLayer;
ref.boxLayer.onLoad=makeSubBox;
ref.boxLayer.onMouseOver = boxSlowVelocity;
ref.boxLayer.onMouseOut = boxSpeedVelocity;
ref.boxLayer.parent = ref;
}
function boxDrag(e) {
/*
Called when a drag is in process. Moves the ticker vertically and slides
it horizontally. Wont allow vertical repositioning if the verticalLock is on.
also makes sure that you don't vertically reposition the ticker outside the
window. It also checks to see if it needs to reposition the clone tape relative
to the active tape.
*/
if (!this.parent.parent.horizontalLock) this.parent.moveBy(e.pageX-oldX,0);
this.layers[0].moveBy(0,e.pageY-oldY);
this.layers[1].moveBy(0,e.pageY-oldY);
if (this.parent.left < 0) this.parent.moveTo(0,this.parent.top);
if (this.parent.left > window.innerWidth-this.parent.clip.width) this.parent.moveTo(window.innerWidth-this.parent.clip.width,this.parent.top);
if ((this.parent.top>0)&&(this.parent.parent.activeBox.top>0) &&
(this.parent.parent.nonActiveBox.top > (this.parent.parent.activeBox.top-this.parent.parent.activeBox.clip.height))) {
this.parent.parent.nonActiveBox.moveTo(0,this.parent.parent.activeBox.top-this.parent.parent.activeBox.clip.height);
}
if ((this.parent.parent.activeBox.top<0)&&(this.parent.parent.activeBox.top+this.parent.parent.activeBox.clip.height<(this.parent.parent.height))) {
this.parent.parent.nonActiveBox.moveTo(0,this.parent.parent.activeBox.top+this.parent.parent.activeBox.clip.height);
}
oldX = e.pageX;
oldY = e.pageY;
}
function boxBeginDrag(e) {
/*
Called when a drag event first happens. Routes off any events occuring to
a link. Grabs the current time to use later for velocity calculation.
Begins trapping mousemove events. Initializes the drag vars.
*/
if (e.target.constructor == window.Url) return routeEvent(e);
startDragTime = new Date();
this.parent.parent.stop();
this.captureEvents(Event.MOUSEMOVE);
this.onmousemove=boxDrag;
oldX=e.pageX;
oldY=e.pageY;
startX=e.pageX;
startY=e.pageY;
return false;
}
function boxDrop(e) {
/*
Called when a drag event ends and the ticker is dropped. Routes off any
events occuring to a link. Grabs the current time, and uses the elapsed
time of the drag in conjunction with the distance of the drag to determine
average velocity in pixels per second. It makes sure velocity lock is not
on before applying the new velocity. When applying, it divides the
velocity by 4, because the mouseover event has put velocity to 50% already,
and also because people drag things too darn fast. If event happens to the
right mouse button (3) it doesn't start the ticker again, because the
right mouse button is the "stop" button.
*/
if (e.target.constructor == window.Url) return routeEvent(e);
endDragTime = new Date();
dragDuration = (endDragTime.getTime() - startDragTime.getTime())/1000;
dragDistance = e.pageY - startY;
if (dragDistance > -2 && dragDistance < 2) {
this.releaseEvents(Event.MOUSEMOVE);
if (e.which == 1) {
this.parent.parent.stopped = false;
this.parent.parent.start();
}
if (e.which == 3) this.parent.parent.stopped = true;
return false;
}
dragAverageVelocity = dragDistance/dragDuration;
this.onmousemove=0;
this.releaseEvents(Event.MOUSEMOVE);
if (!this.parent.parent.velocityLock) this.parent.parent.velocity = Math.round(dragAverageVelocity/4);
else {
if (this.parent.parent.velocity<0 && dragAverageVelocity>0) this.parent.parent.velocity *= -1;
if (this.parent.parent.velocity>0 && dragAverageVelocity<0) this.parent.parent.velocity *= -1;
}
if ((this.parent.parent.velocityMinimum) &&
Math.abs(this.parent.parent.velocity) < this.parent.parent.velocityMinimum) {
if (this.parent.parent.velocity < 0) this.parent.parent.velocity = -1*(this.parent.parent.velocityMinimum/2);
if (this.parent.parent.velocity > 0) this.parent.parent.velocity = (this.parent.parent.velocityMinimum/2);
}
if ((this.parent.parent.velocityMaximum) &&
Math.abs(this.parent.parent.velocity) > this.parent.parent.velocityMaximum) {
if (this.parent.parent.velocity < 0) this.parent.parent.velocity = -1*(this.parent.parent.velocityMaximum/2);
if (this.parent.parent.velocity > 0) this.parent.parent.velocity = (this.parent.parent.velocityMaximum/2);
}
if (e.which == 1) {
this.parent.parent.stopped = false;
this.parent.parent.start();
}
if (e.which == 3) this.parent.parent.stopped = true;
return false;
}
function NewsBox(left,top,width,height,src,velocity) {
/*
Object stuff. Creates references to all the necessary properties and
methods, creates the container layer and then calls the functions to
create the active tape, the clone tape, which in turn calls the
start() method here when everything has loaded sequentially. Sets initial
values to some vars.
*/
this.src = src;
this.left = eval(left);
this.top = eval(top);
this.width = eval(width);
this.height = eval(height);
this.velocity = eval(velocity);
this.horizontalLock = false;
this.velocityLock = false;
this.velocityMinimum = null;
this.velocityMaximum = null;
this.start = startBox;
this.stop = stopBox;
this.stopped = false;
this.container = new Layer(width)
this.container.left = eval(left);
this.container.top = eval(top);
this.container.clip.width= eval(width);
this.container.clip.height= eval(height);
this.container.visibility = "show";
this.container.parent = this;
this.container.onLoad = makeBox(this);
this.container.document.parent = this.container;
this.container.document.captureEvents(Event.MOUSEDOWN | Event.MOUSEUP);
this.container.document.onmousedown=boxBeginDrag;
this.container.document.onmouseup=boxDrop;
}
]]> |
