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/* dom-drag.js 09.25.2001 www.youngpup.net
10.28.2001 - fixed minor bug where events
sometimes fired off the handle, not the root.
*/
<html><head><title>- cropper -</title>
<style type="text/css">
<!--
html, body {
height:100%;
padding:0;
margin:0;
background:white;
font:11px verdana;
}
body {
margin:15px 40px;
}
#banner {
position:absolute;
top:0px; left:0px;
height:100%;
width:19px;
background:black url(http://youngpup.net/img/logo.gif) top left no-repeat;
}
h1 {
font:11px verdana;
font-weight:bold;
margin-top:0;
margin-bottom:1em;
color:#FB3B00;
}
#pbox {
width:300px; height:300px;
overflow:hidden;
}
.opacity{filter: alpha(opacity=60)}
-->
</style>
<script language="javascript">
/**************************************************
* dom-drag.js
* 09.25.2001
* www.youngpup.net
**************************************************
* 10.28.2001 - fixed minor bug where events
* sometimes fired off the handle, not the root.
**************************************************/
var Drag = {
obj : null,
init : function(o, oRoot, minX, maxX, minY, maxY, bSwapHorzRef, bSwapVertRef, fXMapper, fYMapper)
{
o.onmousedown = Drag.start;
o.hmode = bSwapHorzRef ? false : true ;
o.vmode = bSwapVertRef ? false : true ;
o.root = oRoot && oRoot != null ? oRoot : o ;
if (o.hmode && isNaN(parseInt(o.root.style.left ))) o.root.style.left = "0px";
if (o.vmode && isNaN(parseInt(o.root.style.top ))) o.root.style.top = "0px";
if (!o.hmode && isNaN(parseInt(o.root.style.right ))) o.root.style.right = "0px";
if (!o.vmode && isNaN(parseInt(o.root.style.bottom))) o.root.style.bottom = "0px";
o.minX = typeof minX != 'undefined' ? minX : null;
o.minY = typeof minY != 'undefined' ? minY : null;
o.maxX = typeof maxX != 'undefined' ? maxX : null;
o.maxY = typeof maxY != 'undefined' ? maxY : null;
o.xMapper = fXMapper ? fXMapper : null;
o.yMapper = fYMapper ? fYMapper : null;
o.root.onDragStart = new Function();
o.root.onDragEnd = new Function();
o.root.onDrag = new Function();
},
start : function(e)
{
var o = Drag.obj = this;
e = Drag.fixE(e);
var y = parseInt(o.vmode ? o.root.style.top : o.root.style.bottom);
var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
o.root.onDragStart(x, y);
o.lastMouseX = e.clientX;
o.lastMouseY = e.clientY;
if (o.hmode) {
if (o.minX != null) o.minMouseX = e.clientX - x + o.minX;
if (o.maxX != null) o.maxMouseX = o.minMouseX + o.maxX - o.minX;
} else {
if (o.minX != null) o.maxMouseX = -o.minX + e.clientX + x;
if (o.maxX != null) o.minMouseX = -o.maxX + e.clientX + x;
}
if (o.vmode) {
if (o.minY != null) o.minMouseY = e.clientY - y + o.minY;
if (o.maxY != null) o.maxMouseY = o.minMouseY + o.maxY - o.minY;
} else {
if (o.minY != null) o.maxMouseY = -o.minY + e.clientY + y;
if (o.maxY != null) o.minMouseY = -o.maxY + e.clientY + y;
}
document.onmousemove = Drag.drag;
document.onmouseup = Drag.end;
return false;
},
drag : function(e)
{
e = Drag.fixE(e);
var o = Drag.obj;
var ey = e.clientY;
var ex = e.clientX;
var y = parseInt(o.vmode ? o.root.style.top : o.root.style.bottom);
var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
var nx, ny;
if (o.minX != null) ex = o.hmode ? Math.max(ex, o.minMouseX) : Math.min(ex, o.maxMouseX);
if (o.maxX != null) ex = o.hmode ? Math.min(ex, o.maxMouseX) : Math.max(ex, o.minMouseX);
if (o.minY != null) ey = o.vmode ? Math.max(ey, o.minMouseY) : Math.min(ey, o.maxMouseY);
if (o.maxY != null) ey = o.vmode ? Math.min(ey, o.maxMouseY) : Math.max(ey, o.minMouseY);
nx = x + ((ex - o.lastMouseX) * (o.hmode ? 1 : -1));
ny = y + ((ey - o.lastMouseY) * (o.vmode ? 1 : -1));
if (o.xMapper) nx = o.xMapper(y)
else if (o.yMapper) ny = o.yMapper(x)
Drag.obj.root.style[o.hmode ? "left" : "right"] = nx + "px";
Drag.obj.root.style[o.vmode ? "top" : "bottom"] = ny + "px";
Drag.obj.lastMouseX = ex;
Drag.obj.lastMouseY = ey;
Drag.obj.root.onDrag(nx, ny);
return false;
},
end : function()
{
document.onmousemove = null;
document.onmouseup = null;
Drag.obj.root.onDragEnd( parseInt(Drag.obj.root.style[Drag.obj.hmode ? "left" : "right"]),
parseInt(Drag.obj.root.style[Drag.obj.vmode ? "top" : "bottom"]));
Drag.obj = null;
},
fixE : function(e)
{
if (typeof e == 'undefined') e = window.event;
if (typeof e.layerX == 'undefined') e.layerX = e.offsetX;
if (typeof e.layerY == 'undefined') e.layerY = e.offsetY;
return e;
}
};
</script>
<script language="javascript">
var oThang, oHandle, reportBox, iReportCount = 0;
window.onload = function() {
if (document.all || document.getElementById)
{
oThang = document.all ? document.all["thang"] : document.getElementById("thang")
oHandle = document.all ? document.all["handle"] : document.getElementById("handle")
oReport = document.all ? document.all["report"] : document.getElementById("report")
Drag.init(oHandle, oThang, -250, -50, -250, -50);
// report stuff
oThang.onDrag = function(x, y) { reportDrag("", x, y); }
}
function reportDrag(who, x, y) {
oReport.value = who + "" + " X = " + (x + 250) + " Y = " + (y + 250) + " W = 100 H = 100"
}
oThang.onDrag(-250, -250);
}
</script></head>
<body>
<div id="banner"></div>
<h1>DOM-Drag Examples: Cropper</h1>
<div style="width: 300px; height: 300px; overflow: hidden; top: 20px; left: 20px;">
<img src="snare_pic_large-300.jpg">
<div id="thang" style="position: absolute; left: -109px; top: -190px;">
<img class="opacity" style="position: absolute; left: 0px; top: 0px;" src="selection2.gif">
<img id="handle" style="position: absolute; left: 250px; top: 250px; width: 100px; height: 100px;" src="x.gif">
</div>
</div>
<input id="report" style="width: 300px;" type="text">
<p>this was <a href="http://www.styrofirm.com/" target="_blank">jody's</a> idea.</p>
</body></html>
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nav_Crop.zip 
