/*************************************************************************
    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: Nov 2008
*************************************************************************/

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

// Nov 2008 revision adds screen as option
// (may want printed copy to appear as on screen?)

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) {
//	alert(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;
        } );
}

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';
    }
}