/* ***********************************************************
Example 4-3 (DHTMLapi.js)
"Dynamic HTML:The Definitive Reference"
2nd Edition
by Danny Goodman
Published by O'Reilly & Associates  ISBN 1-56592-494-0
http://www.oreilly.com
Copyright 2002 Danny Goodman.  All Rights Reserved.
************************************************************ */
// DHTMLapi.js custom API for cross-platform
// object positioning by Danny Goodman (http://www.dannyg.com).
// Release 2.0. Supports NN4, IE, and W3C DOMs.

// Global variables
var isCSS, isW3C, isIE4, isNN4;
// initialize upon load to let all browsers establish content objects
function initDHTMLAPI() {
    if (document.images) {
        isCSS = (document.body && document.body.style) ? true : false;
        isW3C = (isCSS && document.getElementById) ? true : false;
        isIE4 = (isCSS && document.all) ? true : false;
        isNN4 = (document.layers) ? true : false;
        isIE6CSS = (document.compatMode && document.compatMode.indexOf("CSS1") >= 0) ? true : false;
    }
}
// set event handler to initialize API
window.onload = initDHTMLAPI;

// Seek nested NN4 layer from string name
function seekLayer(doc, name) {
    var theObj;
    for (var i = 0; i < doc.layers.length; i++) {
        if (doc.layers[i].name == name) {
            theObj = doc.layers[i];
            break;
        }
        // dive into nested layers if necessary
        if (doc.layers[i].document.layers.length > 0) {
            theObj = seekLayer(document.layers[i].document, name);
        }
    }
    return theObj;
}

// Convert object name string or object reference
// into a valid element object reference
function getRawObject(obj) {
    var theObj;
    if (typeof obj == "string") {
    //alert("string");
        theobj=document.getElementById? document.getElementById(obj):document.all.obj;
        //if (isW3C) {
        //    theObj = document.getElementById(obj);
        //} else {
        //    if (isIE4) {
        //        theObj = document.all(obj);
        //    } else {
        //        if (isNN4) {
        //            theObj = seekLayer(document, obj);
        //        }
        //    }
        //}
    } else {
        // pass through object reference
        theObj = obj;
    }
    return theObj;
}

// Convert object name string or object reference
// into a valid style (or NN4 layer) reference
function getObject(obj) {
    var theObj = getRawObject(obj);
    if (theObj && isCSS) {
        theObj = theObj.style;
    }
    return theObj;
}

// Position an object at a specific pixel coordinate
function shiftTo(obj, x, y) {
    var theObj = getObject(obj);
    if (theObj) {
        if (isCSS) {
            // equalize incorrect numeric value type
            var units = (typeof theObj.left == "string") ? "px" : 0 
            theObj.left = x + units;
            theObj.top = y + units;
        } else if (isNN4) {
            theObj.moveTo(x,y)
        }
    }
}

// Move an object by x and/or y pixels
function shiftBy(obj, deltaX, deltaY) {
    var theObj = getObject(obj);
    if (theObj) {
        if (isCSS) {
            // equalize incorrect numeric value type
            var units = (typeof theObj.left == "string") ? "px" : 0 
            theObj.left = getObjectLeft(obj) + deltaX + units;
            theObj.top = getObjectTop(obj) + deltaY + units;
        } else if (isNN4) {
            theObj.moveBy(deltaX, deltaY);
        }
    }
}

// Set the z-order of an object
function setZIndex(obj, zOrder) {
    var theObj = getObject(obj);
    if (theObj) {
        theObj.zIndex = zOrder;
    }
}

// Set the background color of an object
function setBGColor(obj, color) {
    var theObj = getObject(obj);
    if (theObj) {
        if (isNN4) {
            theObj.bgColor = color;
        } else if (isCSS) {
            theObj.backgroundColor = color;
        }
    }
}

// Set the visibility of an object to visible
function show(obj) {
    var theObj = getObject(obj);
    if (theObj) {
        theObj.visibility = "visible";
    }
}

// Set the visibility of an object to hidden
function hide(obj) {
    var theObj = getObject(obj);
    if (theObj) {
    	if (theObj.visibility != "hidden") {
    		//alert("hide");
    		//alert(theObj.visibility);
    	}
        theObj.visibility = "hidden";
    }
}

// Retrieve the x coordinate of a positionable object
function getObjectLeft(obj)  {
    var elem = getRawObject(obj);
    var result = 0;
    if (document.defaultView) {
        if (elem.style) {
            result = elem.style.left;
        }
        else {
            var style = document.defaultView;
            var cssDecl = style.getComputedStyle(elem, "");
            result = cssDecl.getPropertyValue("left");
        }
    } else if (elem.currentStyle) {
        result = elem.currentStyle.left;
    } else if (elem.style) {
        result = elem.style.left;
    } else if (isNN4) {
        result = elem.left;
    }
    return parseInt(result);
}

// Retrieve the x coordinate of a positionable object
//function getObjectLeft(obj)  {
//    var elem = obj;
//    var elem = getRawObject(obj);
//    var result = 0;
//    if (iens6) {
//    	result=elem.style.left;
//    } else if (document.defaultView) {
//        var style = document.defaultView;
//        var cssDecl = style.getComputedStyle(elem, "");
//        result = cssDecl.getPropertyValue("left");
//    } else if (elem.currentStyle) {
//        result = elem.currentStyle.left;
//    } else if (elem.style) {
//        result = elem.style.left;
//    } else if (isNN4) {
//        result = elem.left;
//    }
//    alert("Left="+result)
//    return parseInt(result);
//}

// Retrieve the y coordinate of a positionable object
function getObjectTop(obj)  {
    var elem = getRawObject(obj);
    var result = 0;
    if (document.defaultView) {
        if (elem.style) {
            result = elem.style.top;
        }
        else {
            var style = document.defaultView;
            var cssDecl = style.getComputedStyle(elem, "");
            result = cssDecl.getPropertyValue("top");
        }
    } else if (elem.currentStyle) {
        result = elem.currentStyle.top;
    } else if (elem.style) {
        result = elem.style.top;
    } else if (isNN4) {
        result = elem.top;
    }
    return parseInt(result);
}

// Retrieve the rendered width of an element
function getObjectWidth(obj)  {
	//alert(obj);
    var elem = getRawObject(obj);
    var result = 0;
        if (elem.offsetWidth) {
        	if (elem.scrollWidth && (elem.offsetWidth != elem.scrollWidth)) {
        	    result = elem.scrollWidth;
        	} else {
                result = elem.offsetWidth;
                }
        } else {
            if (elem.clip && elem.clip.width) {
                result = elem.clip.width;
            } else {
                if (elem.style && elem.style.pixelWidth) {
                    result = elem.style.pixelWidth;
                }
            }
        }
    return parseInt(result);
}
// Retrieve the rendered width of an element
//function getObjectWidth(obj)  {
//    var elem = getRawObject(obj);
//    var result = 0;
//    alert("*Width="+elem.style.width);
//    if (document.defaultView) {
//        var style = document.defaultView;
//        var cssDecl = style.getComputedStyle(elem, "");
//        result = cssDecl.getPropertyValue("width");
//	    alert("result="+result)
//    } else if (elem.offsetWidth) {
//        result = elem.offsetWidth;
//    } else if (elem.clip && elem.clip.width) {
//        result = elem.clip.width;
//    } else if (elem.style && elem.style.pixelWidth) {
//        result = elem.style.pixelWidth;
//    }
//    alert("Width="+result)
//    return parseInt(result);
//}

// Retrieve the rendered height of an element
function getObjectHeight(obj)  {
    var elem = getRawObject(obj);
    var result = 0;
    if (elem.offsetHeight) {
        result = elem.offsetHeight;
    } else if (elem.clip && elem.clip.height) {
        result = elem.clip.height;
    } else if (elem.style && elem.style.pixelHeight) {
        result = elem.style.pixelHeight;
    }
    return parseInt(result);
}


// Return the available content width space in browser window
function getInsideWindowWidth() {
    if (window.innerWidth) {
        return window.innerWidth;
    } else if (isIE6CSS) {
        // measure the html element's clientWidth
        return document.body.parentElement.clientWidth
    } else if (document.body && document.body.clientWidth) {
        return document.body.clientWidth;
    }
    return 0;
}
// Return the available content height space in browser window
function getInsideWindowHeight() {
    if (window.innerHeight) {
        return window.innerHeight;
    } else if (isIE6CSS) {
        // measure the html element's clientHeight
        return document.body.parentElement.clientHeight
    } else if (document.body && document.body.clientHeight) {
        return document.body.clientHeight;
    }
    return 0;
}