// ||||||||||||||||||||||||||||||||||||||||||||||||||
// Scroller Class
ScrollObj = function(speed, dragHeight, trackHeight, trackObj, upObj, downObj, dragObj, contentMaskObj, contentObj){
this.speed = speed;
this.dragHeight = dragHeight;
this.trackHeight = trackHeight;
this.trackObj = getElement(trackObj);
this.upObj = getElement(upObj);
this.downObj = getElement(downObj);
this.dragObj = getElement(dragObj);
this.contentMaskObj = getElement(contentMaskObj);
this.contentObj = getElement(contentObj,contentMaskObj);
this.obj = contentObj+"Object";
eval(this.obj+"=this");
this.trackTop = this.dragObj.getTop();
this.trackLength = this.trackHeight-this.dragHeight;
this.trackBottom = this.trackTop+this.trackLength;
this.contentMaskHeight = this.contentMaskObj.getClipHeight();
this.contentHeight = this.contentObj.getHeight();
this.contentLength = this.contentHeight-this.contentMaskHeight;
this.scrollLength = this.trackLength/this.contentLength;
this.scrollTimer = null;
if(this.contentHeight <= this.contentMaskHeight){
this.dragObj.hideVis();
}else{
var self = this;
this.trackObj.addEvent("onmousedown", function(e){self.scrollJump(e);return false});
this.upObj.addEvent("onmousedown", function(){self.scroll(self.speed);return false});
this.upObj.addEvent("onmouseup", function(){self.stopScroll()});
this.upObj.addEvent("onmouseout", function(){self.stopScroll()});
this.downObj.addEvent("onmousedown", function(){self.scroll(-self.speed);return false});
this.downObj.addEvent("onmouseup", function(){self.stopScroll()});
this.downObj.addEvent("onmouseout", function(){self.stopScroll()});
this.dragObj.addEvent("onmousedown", function(e){self.startDrag(e);return false});
if(iex) this.dragObj.addEvent("ondragstart", function(){return false});
}
}
ScrollObj.prototype.startDrag = function(e){
this.dragStartMouse = getYMouse(e);
this.dragStartOffset = this.dragObj.getTop();
var self = this;
document.addEvent("onmousemove", function(e){self.drag(e)});
document.addEvent("onmouseup", function(){self.stopDrag()});
}
ScrollObj.prototype.stopDrag = function(){
document.removeEvent("onmousemove");
document.removeEvent("onmouseup");
}
ScrollObj.prototype.drag = function(e){
var currentMouse = getYMouse(e);
var mouseDifference = currentMouse-this.dragStartMouse;
var dragDistance = this.dragStartOffset+mouseDifference;
var dragMovement = (dragDistance<this.trackTop) ? this.trackTop : (dragDistance>this.trackBottom) ? this.trackBottom : dragDistance;
this.dragObj.setTop(dragMovement);
var contentMovement = -(dragMovement-this.trackTop)*(1/this.scrollLength);
this.contentObj.setTop(contentMovement);
}
ScrollObj.prototype.scroll = function(speed){
var contentMovement = this.contentObj.getTop()+speed;
var dragMovement = this.trackTop-Math.round(this.contentObj.getTop()*(this.trackLength/this.contentLength));
if(contentMovement > 0){
contentMovement = 0;
}else if(contentMovement < -this.contentLength){
contentMovement = -this.contentLength;
}
if(dragMovement < this.trackTop){
dragMovement = this.trackTop;
}else if(dragMovement > this.trackBottom){
dragMovement = this.trackBottom;
}
this.contentObj.setTop(contentMovement);
this.dragObj.setTop(dragMovement);
this.scrollTimer = window.setTimeout(this.obj+".scroll("+speed+")",25);
}
ScrollObj.prototype.stopScroll = function(){
if(this.scrollTimer){
window.clearTimeout(this.scrollTimer);
this.scrollTimer = null;
}
}
ScrollObj.prototype.scrollJump = function(e){
var currentMouse = getYMouse(e);
var dragDistance = currentMouse-(this.dragHeight/2);
var dragMovement = (dragDistance<this.trackTop) ? this.trackTop : (dragDistance>this.trackBottom) ? this.trackBottom : dragDistance;
this.dragObj.setTop(dragMovement);
var contentMovement = -(dragMovement-this.trackTop)*(1/this.scrollLength);
this.contentObj.setTop(contentMovement);
}