/*************************************************************************
	This code is from Dynamic Web Coding at dyn-web.com
	Copyright 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!

	unobtrusive event handling for use with dw_scroll.js
	version date: Aug 2008
*************************************************************************/

/////////////////////////////////////////////////////////////////////
// two ways to add style sheet for capable browsers

dw_writeStyleSheet = function(file) {
	document.write('<link rel="stylesheet" href="' + file + '" media="screen" />');
}

function dw_addLinkCSS(file) {
	if ( !document.createElement ) return;
	var el = document.createElement("link");
	el.setAttribute("rel", "stylesheet");
	el.setAttribute("type", "text/css");
	el.setAttribute("media", "screen");
	el.setAttribute("href", file);
	document.getElementsByTagName('head')[0].appendChild(el);
}
/////////////////////////////////////////////////////////////////////

// Example class names: load_wn_lyr1, load_wn_lyr2_t2
dw_scrollObj.prototype.setUpLoadLinks = function(controlsId) {
	var wndoId = this.id; var el = document.getElementById(controlsId); 
	var links = el.getElementsByTagName('a');
	var cls, parts;
	for (var i=0; links[i]; i++) {
		cls = dw_scrollObj.get_DelimitedClass( links[i].className );
		parts = cls.split('_');
		if ( parts[0] == 'load' && parts[1] == wndoId && parts.length > 2 ) {
			// no checks on lyrId, horizId
			var lyrId = parts[2]; var horizId = parts[3]? parts[3]: null;
			dw_Event.add( links[i], 'click', function (wndoId, lyrId, horizId) {
				return function (e) {
					dw_scrollObj.col[wndoId].load(lyrId, horizId);
					if (e && e.preventDefault) e.preventDefault();
					return false;
				}
			}(wndoId, lyrId, horizId) ); // see Crockford js good parts pg 39
		}
	}
}

dw_scrollObj.prototype.setUpScrollControls = function(controlsId, autoHide, axis) {
	var wndoId = this.id; var el = document.getElementById(controlsId); 
	if ( autoHide && axis == 'v' || axis == 'h' ) {
		dw_scrollObj.handleControlVis(controlsId, wndoId, axis);
		dw_Scrollbar_Co.addEvent( this, 'on_load', function() { dw_scrollObj.handleControlVis(controlsId, wndoId, axis); } );
		dw_Scrollbar_Co.addEvent( this, 'on_update', function() { dw_scrollObj.handleControlVis(controlsId, wndoId, axis); } );
	}
	
	var links = el.getElementsByTagName('a'), cls, eType;
	for (var i=0; links[i]; i++) { 
		cls = dw_scrollObj.get_DelimitedClass( links[i].className );
		eType = dw_scrollObj.getEv_FnType( cls.slice(0, cls.indexOf('_') ) );
		switch ( eType ) {
			case 'mouseover' :
			case 'mousedown' :
				dw_scrollObj.handleMouseOverDownLinks(links[i], wndoId, cls);
				break;
			case 'scrollToId': 
				dw_scrollObj.handleScrollToId(links[i], wndoId, cls);
				break;
			case 'scrollTo' :
			case 'scrollBy':
			case 'click': 
				dw_scrollObj.handleClick(links[i], wndoId, cls) ;
				break;
		}
	}
}

dw_scrollObj.handleMouseOverDownLinks = function (linkEl, wndoId, cls) {
	var parts = cls.split('_'); var eType = parts[0];
	var re = /^(mouseover|mousedown)_(up|down|left|right)(_[\d]+)?$/;
				
	if ( re.test(cls) ) { 
		var eAlt = (eType == 'mouseover')? 'mouseout': 'mouseup';
		var dir = parts[1];  var speed = parts[2] || null; 
		var deg = (dir == 'up')? 90: (dir == 'down')? 270: (dir == 'left')? 180: 0;
		
		dw_Event.add(linkEl, eType, function (e) { dw_scrollObj.col[wndoId].initScrollVals(deg, speed); } );
		dw_Event.add(linkEl, eAlt, function (e) { dw_scrollObj.col[wndoId].ceaseScroll(); } );
			
		if ( eType == 'mouseover') {
			dw_Event.add( linkEl, 'mousedown', function (e) { dw_scrollObj.col[wndoId].speed *= 3; } );
			dw_Event.add( linkEl, 'mouseup', function (e) { 
				dw_scrollObj.col[wndoId].speed = dw_scrollObj.prototype.speed; } ); 
		}
		dw_Event.add( linkEl, 'click', function(e) { if (e && e.preventDefault) e.preventDefault(); return false; } );
	}
}

// scrollToId_smile, scrollToId_smile_100, scrollToId_smile_lyr1_100    
dw_scrollObj.handleScrollToId = function (linkEl, wndoId, cls) {
	var parts = cls.split('_'); var id = parts[1], lyrId, dur;
	if ( parts[2] ) {
		if ( isNaN( parseInt(parts[2]) ) ) { 
			lyrId = parts[2];
			dur = ( parts[3] && !isNaN( parseInt(parts[3]) ) )? parseInt(parts[3]): null;
		} else {
			dur = parseInt( parts[2] );
		}
	}
	dw_Event.add( linkEl, 'click', function (e) {
			dw_scrollObj.scrollToId(wndoId, id, lyrId, dur);
			if (e && e.preventDefault) e.preventDefault();
			return false;
		} );
}

// added by me, gateway to private method
dw_scrollObj.prototype.myscrollToId = function(wndoId, id, lyrId, dur) {
	dw_scrollObj.scrollToId(wndoId, id, lyrId, dur);
}

// doesn't checks if lyrId in wndo, el in lyrId
dw_scrollObj.scrollToId = function(wndoId, id, lyrId, dur) {
	var wndo = dw_scrollObj.col[wndoId];
	var el = document.getElementById(id);
	if (el) {
		if ( lyrId ) {
			if ( document.getElementById(lyrId) && wndo.lyrId != lyrId ) {
				wndo.load(lyrId);
			}
		}
		var lyr = document.getElementById(wndo.lyrId);
		var x = dw_getLayerOffset(el, lyr, 'left');
		var y = dw_getLayerOffset(el, lyr, 'top');
		wndo.initScrollToVals(x, y, dur);
	}
}

dw_scrollObj.handleClick = function (linkEl, wndoId, cls) {
	var wndo = dw_scrollObj.col[wndoId];
	var parts = cls.split('_'); var eType = parts[0]; 
	var dur_re = /^([\d]+)$/; var fn, re, x, y, dur;
	
	switch (eType) {
		case 'scrollTo' :
			fn = 'scrollTo';  re = /^(null|end|[\d]+)$/;
			x = re.test( parts[1] )? parts[1]: '';
			y = re.test( parts[2] )? parts[2]: '';
			dur = ( parts[3] && dur_re.test(parts[3]) )? parts[3]: null;
			break;
		case 'scrollBy': // scrollBy_m30_m40, scrollBy_null_m100, scrollBy_100_null
			fn = 'scrollBy';  re = /^(([m]?[\d]+)|null)$/;
			x = re.test( parts[1] )? parts[1]: '';
			y = re.test( parts[2] )? parts[2]: '';
			
			// negate numbers (m not - but vice versa) 
			if ( !isNaN( parseInt(x) ) ) {
				x = -parseInt(x);
			} else if ( typeof x == 'string' ) {
				x = x.indexOf('m') !=-1 ? x.replace('m', ''): x;
			}
			if ( !isNaN( parseInt(y) ) ) {
				y = -parseInt(y);
			} else if ( typeof y == 'string' ) {
				y = y.indexOf('m') !=-1 ? y.replace('m', ''): y;
			}
			
			dur = ( parts[3] && dur_re.test(parts[3]) )? parts[3]: null;
			break;
		
		case 'click': 
			var o = dw_scrollObj.getClickParts(cls);
			fn = o.fn; x = o.x; y = o.y; dur = o.dur;
			break;
	}
	if ( x !== '' && y !== '' ) {
		if (x == 'end') { x = wndo.maxX; }
		if (y == 'end') { y = wndo.maxY; }
		if (x === 'null' || x === null) { x = wndo.x; }
		if (y === 'null' || y === null) { y = wndo.y; }
		
		x = parseInt(x); y = parseInt(y);  
		dur = !isNaN( parseInt(dur) )? parseInt(dur): null;
		
		if (fn == 'scrollBy') {
			dw_Event.add( linkEl, 'click', function (e) {
					dw_scrollObj.col[wndoId].initScrollByVals(x, y, dur);
					if (e && e.preventDefault) e.preventDefault();
					return false;
				} );
		} else if (fn == 'scrollTo') {
			dw_Event.add( linkEl, 'click', function (e) {
					dw_scrollObj.col[wndoId].initScrollToVals(x, y, dur);
					if (e && e.preventDefault) e.preventDefault();
					return false;
				} );
		}
	}
}

// get info from className (e.g., click_down_by_100)
dw_scrollObj.getClickParts = function(cls) {
	var parts = cls.split('_');
	var re = /^(up|down|left|right)$/;
	var dir, fn = '', dur, ar, val, x = '', y = '';
	
	if ( parts.length >= 4 ) {
		ar = parts[1].match(re);
		dir = ar? ar[1]: null;
			
		re = /^(to|by)$/; 
		ar = parts[2].match(re);
		if (ar) {
			fn = (ar[0] == 'to')? 'scrollTo': 'scrollBy';
		} 
	
		val = parts[3]; // value on x or y axis
		re = /^([\d]+)$/;
		dur = ( parts[4] && re.test(parts[4]) )? parts[4]: null;
	
		switch (fn) {
			case 'scrollBy' :
				if ( !re.test( val ) ) {
					x = ''; y = ''; break;
				}
				switch (dir) { // 0 for unspecified axis 
					case 'up' : x = 0; y = val; break;
					case 'down' : x = 0; y = -val; break;
					case 'left' : x = val; y = 0; break;
					case 'right' : x = -val; y = 0;
				 }
				break;
			case 'scrollTo' :
				re = /^(end|[\d]+)$/;
				if ( !re.test( val ) ) {
					x = ''; y = ''; break;
				}
				switch (dir) { // null for unspecified axis 
					case 'up' : x = null; y = val; break;
					case 'down' : x = null; y = (val == 'end')? val: -val; break;
					case 'left' : x = val; y = null; break;
					case 'right' : x = (val == 'end')? val: -val; y = null;
				 } 
				break;
		 }
	}
	return { fn: fn, x: x, y: y, dur: dur }
}

dw_scrollObj.getEv_FnType = function(str) {
	var re = /^(mouseover|mousedown|scrollBy|scrollTo|scrollToId|click)$/;
	if (re.test(str) ) {
		return str;
	}
	return '';
}

// return class name with underscores in it 
dw_scrollObj.get_DelimitedClass = function(cls) {
	if ( cls.indexOf('_') == -1 ) {
		return '';
	}
	var whitespace = /\s+/;
	if ( !whitespace.test(cls) ) {
		return cls;
	} else {
		var classes = cls.split(whitespace); 
		for(var i = 0; classes[i]; i++) { 
			if ( classes[i].indexOf('_') != -1 ) {
				return classes[i];
			}
		}
	}
}

dw_scrollObj.handleControlVis = function(controlsId, wndoId, axis) {
	var wndo = dw_scrollObj.col[wndoId];
	var el = document.getElementById(controlsId);
	if ( ( axis == 'v' && wndo.maxY > 0 ) || ( axis == 'h' && wndo.maxX > 0 ) ) {
		el.style.visibility = 'visible';
	} else {
		el.style.visibility = 'hidden';
	}
}