/*************************************************************************
    This code is from Dynamic Web Coding at dyn-web.com
    Copyright 2001-2008 by Sharon Paine 
    See Terms of Use at www.dyn-web.com/business/terms.php
    regarding conditions under which you may use this code.
    This notice must be retained in the code as is!
*************************************************************************/

// horizId only needed for horizontal scrolling
function dw_scrollObj(wndoId, lyrId, horizId) {
    if (!document.getElementById) return;
    var wn = document.getElementById(wndoId);
    this.id = wndoId; dw_scrollObj.col[this.id] = this;
    this.animString = "dw_scrollObj.col." + this.id;
    this.load(lyrId, horizId);
    
    if (wn == null) return;  // aris 25/08/2008
    if (wn.addEventListener) {
      wn.addEventListener('DOMMouseScroll', dw_scrollObj.doOnMouseWheel, false);
    } 
    wn.onmousewheel = dw_scrollObj.doOnMouseWheel;
}

dw_scrollObj.col = {}; // collect instances
dw_scrollObj.defaultSpeed = dw_scrollObj.prototype.speed = 100; // default for mouseover or mousedown scrolling
dw_scrollObj.defaultSlideDur = dw_scrollObj.prototype.slideDur = 500; // default duration of glide onclick

// pseudo events 
dw_scrollObj.prototype.on_load = function() {} // when dw_scrollObj initialized or new layer loaded
dw_scrollObj.prototype.on_scroll = function() {}
dw_scrollObj.prototype.on_scroll_start = function() {}
dw_scrollObj.prototype.on_scroll_stop = function() {} // when scrolling has ceased (mouseout/up)
dw_scrollObj.prototype.on_scroll_end = function() {} // reached end

dw_scrollObj.prototype.on_glidescroll = function() {}
dw_scrollObj.prototype.on_glidescroll_start = function() {}
dw_scrollObj.prototype.on_glidescroll_stop = function() {} // destination (to/by) reached
dw_scrollObj.prototype.on_glidescroll_end = function() {} // reached end

dw_scrollObj.prototype.load = function(lyrId, horizId) {
    var wndo, lyr;
    if (this.lyrId) { // layer currently loaded?
      lyr = document.getElementById(this.lyrId);
      lyr.style.visibility = "hidden";
    }

    this.lyr = lyr = document.getElementById(lyrId); // hold this.lyr?
    if (this.lyr == null) return; // aris 23/08/2008

    this.lyr.style.position = "absolute"; 
    this.lyrId = lyrId; // hold id of currently visible layer
    this.horizId = horizId || null; // hold horizId for update fn
    wndo = document.getElementById(this.id);
    this.y = 0; this.x = 0; this.shiftTo(0,0);
    this.maxY = (lyr.offsetHeight - wndo.offsetHeight > 0)? lyr.offsetHeight - wndo.offsetHeight: 0;
    this.wd = horizId? document.getElementById(horizId).offsetWidth: lyr.offsetWidth;
    this.maxX = (this.wd - wndo.offsetWidth > 0)? this.wd - wndo.offsetWidth: 0;
    lyr.style.visibility = "visible";
    this.ready = true; this.on_load(); 
}

dw_scrollObj.prototype.shiftTo = function(x, y) {
    if (this.lyr) {
      this.lyr.style.left = (this.x = x) + "px"; 
      this.lyr.style.top = (this.y = y) + "px";
    }
}

dw_scrollObj.prototype.getX = function() { return this.x; }
dw_scrollObj.prototype.getY = function() { return this.y; }

dw_scrollObj.prototype.updateDims = function() {
    var wndo = document.getElementById(this.id);
    var lyr = document.getElementById(this.lyrId);
    this.maxY = (lyr.offsetHeight - wndo.offsetHeight > 0)? lyr.offsetHeight - wndo.offsetHeight: 0;
    this.wd = this.horizId? document.getElementById( this.horizId ).offsetWidth: lyr.offsetWidth;
    this.maxX = (this.wd - wndo.offsetWidth > 0)? this.wd - wndo.offsetWidth: 0;
}

// for mouseover/mousedown scrolling
dw_scrollObj.prototype.initScrollVals = function(deg, speed) {
  if (!this.ready) return; 
  if (this.timerId) {
    clearInterval(this.timerId); this.timerId = 0;
  }
  this.speed = speed || dw_scrollObj.defaultSpeed;
  this.fx = (deg == 0)? -1: (deg == 180)? 1: 0;
  this.fy = (deg == 90)? 1: (deg == 270)? -1: 0;
  this.endX = (deg == 90 || deg == 270)? this.x: (deg == 0)? -this.maxX: 0; 
  this.endY = (deg == 0 || deg == 180)? this.y: (deg == 90)? 0: -this.maxY;
  this.lyr = document.getElementById(this.lyrId);
  this.lastTime = new Date().getTime();
  this.on_scroll_start(this.x, this.y);  
  this.timerId = setInterval(this.animString + ".scroll()", 10);    
}

dw_scrollObj.prototype.scroll = function() {
  var now = new Date().getTime();
  var d = (now - this.lastTime)/1000 * this.speed;
  if (d > 0) { 
    var x = this.x + Math.round(this.fx * d); var y = this.y + Math.round(this.fy * d);
    if ( ( this.fx == -1 && x > -this.maxX ) || ( this.fx == 1 && x < 0 ) || 
	 ( this.fy == -1 && y > -this.maxY ) || ( this.fy == 1 && y < 0 ) ) 
      {
	this.lastTime = now;
	this.shiftTo(x, y);
	this.on_scroll(x, y);
      } else {
      clearInterval(this.timerId); this.timerId = 0;
      this.shiftTo(this.endX, this.endY);
      this.on_scroll_end(this.endX, this.endY);
    }
  }
}

// when scrolling has ceased (mouseout/up)
dw_scrollObj.prototype.ceaseScroll = function() {
  if (!this.ready) return;
  if (this.timerId) {
    clearInterval(this.timerId); this.timerId = 0; 
  }
  //this.lyr = null; // discard ref?
  this.on_scroll_stop(this.x, this.y); 
}

// glide onclick scrolling
dw_scrollObj.prototype.initScrollByVals = function(dx, dy, dur) {
  if ( !this.ready || this.sliding ) return;
  this.startX = this.x; this.startY = this.y;
  this.destX = this.destY = this.distX = this.distY = 0;
  if (dy < 0) {
    this.distY = (this.startY + dy >= -this.maxY)? dy: -(this.startY  + this.maxY);
  } else if (dy > 0) {
    this.distY = (this.startY + dy <= 0)? dy: -this.startY;
  }
  if (dx < 0) {
    this.distX = (this.startX + dx >= -this.maxX)? dx: -(this.startX + this.maxX);
  } else if (dx > 0) {
    this.distX = (this.startX + dx <= 0)? dx: -this.startX;
  }
  this.destX = this.startX + this.distX; this.destY = this.startY + this.distY;
  this.glideScrollPrep(this.destX, this.destY, dur);
}

dw_scrollObj.prototype.initScrollToVals = function(destX, destY, dur) {
  if ( !this.ready || this.sliding ) return;
  this.startX = this.x; this.startY = this.y;
  this.destX = -Math.max( Math.min(destX, this.maxX), 0);
  this.destY = -Math.max( Math.min(destY, this.maxY), 0);
  this.distY = this.destY - this.startY;
  this.distX = this.destX - this.startX;
  this.glideScrollPrep(this.destX, this.destY, dur);
}

dw_scrollObj.prototype.glideScrollPrep = function(destX, destY, dur) {
  this.slideDur = dur || dw_scrollObj.defaultSlideDur;
  this.per = Math.PI/(2 * this.slideDur); this.sliding = true;
  this.lyr = document.getElementById(this.lyrId); 
  this.startTime = new Date().getTime();
  this.timerId = setInterval(this.animString + ".doGlideScroll()",10);
  this.on_glidescroll_start(this.startX, this.startY);
}

dw_scrollObj.prototype.doGlideScroll = function() {
  var elapsed = new Date().getTime() - this.startTime;
  if (elapsed < this.slideDur) {
    var x = this.startX + Math.round( this.distX * Math.sin(this.per*elapsed) );
    var y = this.startY + Math.round( this.distY * Math.sin(this.per*elapsed) );
    this.shiftTo(x, y); 
    this.on_glidescroll(x, y);
    } else {	// if time's up
    clearInterval(this.timerId); this.timerId = 0; this.sliding = false;
    this.shiftTo(this.destX, this.destY);
    //this.lyr = null; 
    this.on_glidescroll_stop(this.destX, this.destY);
    // end of axis reached ? 
    if ( this.distX && (this.destX == 0 || this.destX == -this.maxX) 
	 || this.distY && (this.destY == 0 || this.destY == -this.maxY) ) { 
      this.on_glidescroll_end(this.destX, this.destY);
    } 
  }
}

//  resource: http://adomas.org/javascript-mouse-wheel/
dw_scrollObj.handleMouseWheel = function(id, delta) {
  var wndo = dw_scrollObj.col[id];
  var x = wndo.x;
  var y = wndo.y;
  wndo.on_scroll_start(x,y);
  var ny;
  ny = 12  * delta + y
  ny = (ny < 0 && ny >= -wndo.maxY)? ny: (ny < -wndo.maxY)? -wndo.maxY: 0;
  wndo.shiftTo(x, ny);
  wndo.on_scroll(x, ny);
}

dw_scrollObj.doOnMouseWheel = function(e) {
  var delta = 0;
  if (!e) e = window.event;
  if (e.wheelDelta) { /* IE/Opera. */
    delta = e.wheelDelta/120;
    if (window.opera) delta = -delta;
  } else if (e.detail) { // Mozilla 
    delta = -e.detail/3;
  }
  if (delta) { // > 0 up, < 0 down
    dw_scrollObj.handleMouseWheel(this.id, delta);
  }
  if (e.preventDefault) e.preventDefault();
  e.returnValue = false;
}

dw_scrollObj.GeckoTableBugFix = function() {} // no longer need old bug fix

// Get position of el within layer (oCont) sOff: 'left' or 'top'
function dw_getLayerOffset(el, oCont, sOff) {
  var off = "offset" + sOff.charAt(0).toUpperCase() + sOff.slice(1);
  var val = el[off];
  while ( (el = el.offsetParent) != oCont ) 
    val += el[off];
  var clientOff = off.replace("offset", "client");
  if ( el[clientOff] ) val += el[clientOff];
  return val;
}