/************************************************** * 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;    }};