javascript代码实例教程-dom-drag.js

发布时间:2019-01-17 发布网站:脚本宝典
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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.  **************************************************/  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;  } };

 

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