js/dom-drag.js

   1 /**************************************************
   2  * dom-drag.js
   3  * 09.25.2001
   4  * www.youngpup.net
   5  **************************************************
   6  * 10.28.2001 - fixed minor bug where events
   7  * sometimes fired off the handle, not the root.
   8  **************************************************/
   9
  10 var Drag = {
  11
  12         obj : null,
  13
  14         init : function(o, oRoot, minX, maxX, minY, maxY, bSwapHorzRef, bSwapVertRef, fXMapper, fYMapper)
  15         {
  16                 o.onmousedown   = Drag.start;
  17
  18                 o.hmode                 = bSwapHorzRef ? false : true ;
  19                 o.vmode                 = bSwapVertRef ? false : true ;
  20
  21                 o.root = oRoot && oRoot != null ? oRoot : o ;
  22
  23                 if (o.hmode  && isNaN(parseInt(o.root.style.left  ))) o.root.style.left   = "0px";
  24                 if (o.vmode  && isNaN(parseInt(o.root.style.top   ))) o.root.style.top    = "0px";
  25                 if (!o.hmode && isNaN(parseInt(o.root.style.right ))) o.root.style.right  = "0px";
  26                 if (!o.vmode && isNaN(parseInt(o.root.style.bottom))) o.root.style.bottom = "0px";
  27
  28                 o.minX  = typeof minX != 'undefined' ? minX : null;
  29                 o.minY  = typeof minY != 'undefined' ? minY : null;
  30                 o.maxX  = typeof maxX != 'undefined' ? maxX : null;
  31                 o.maxY  = typeof maxY != 'undefined' ? maxY : null;
  32
  33                 o.xMapper = fXMapper ? fXMapper : null;
  34                 o.yMapper = fYMapper ? fYMapper : null;
  35
  36                 o.root.onDragStart      = new Function();
  37                 o.root.onDragEnd        = new Function();
  38                 o.root.onDrag           = new Function();
  39         },
  40
  41         start : function(e)
  42         {
  43                 var o = Drag.obj = this;
  44                 e = Drag.fixE(e);
  45                 var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
  46                 var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
  47                 o.root.onDragStart(x, y);
  48
  49                 o.lastMouseX    = e.clientX;
  50                 o.lastMouseY    = e.clientY;
  51
  52                 if (o.hmode) {
  53                         if (o.minX != null)     o.minMouseX     = e.clientX - x + o.minX;
  54                         if (o.maxX != null)     o.maxMouseX     = o.minMouseX + o.maxX - o.minX;
  55                 } else {
  56                         if (o.minX != null) o.maxMouseX = -o.minX + e.clientX + x;
  57                         if (o.maxX != null) o.minMouseX = -o.maxX + e.clientX + x;
  58                 }
  59
  60                 if (o.vmode) {
  61                         if (o.minY != null)     o.minMouseY     = e.clientY - y + o.minY;
  62                         if (o.maxY != null)     o.maxMouseY     = o.minMouseY + o.maxY - o.minY;
  63                 } else {
  64                         if (o.minY != null) o.maxMouseY = -o.minY + e.clientY + y;
  65                         if (o.maxY != null) o.minMouseY = -o.maxY + e.clientY + y;
  66                 }
  67
  68                 document.onmousemove    = Drag.drag;
  69                 document.onmouseup              = Drag.end;
  70
  71                 return false;
  72         },
  73
  74         drag : function(e)
  75         {
  76                 e = Drag.fixE(e);
  77                 var o = Drag.obj;
  78
  79                 var ey  = e.clientY;
  80                 var ex  = e.clientX;
  81                 var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
  82                 var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
  83                 var nx, ny;
  84
  85                 if (o.minX != null) ex = o.hmode ? Math.max(ex, o.minMouseX) : Math.min(ex, o.maxMouseX);
  86                 if (o.maxX != null) ex = o.hmode ? Math.min(ex, o.maxMouseX) : Math.max(ex, o.minMouseX);
  87                 if (o.minY != null) ey = o.vmode ? Math.max(ey, o.minMouseY) : Math.min(ey, o.maxMouseY);
  88                 if (o.maxY != null) ey = o.vmode ? Math.min(ey, o.maxMouseY) : Math.max(ey, o.minMouseY);
  89
  90                 nx = x + ((ex - o.lastMouseX) * (o.hmode ? 1 : -1));
  91                 ny = y + ((ey - o.lastMouseY) * (o.vmode ? 1 : -1));
  92
  93                 if (o.xMapper)          nx = o.xMapper(y)
  94                 else if (o.yMapper)     ny = o.yMapper(x)
  95
  96                 Drag.obj.root.style[o.hmode ? "left" : "right"] = nx + "px";
  97                 Drag.obj.root.style[o.vmode ? "top" : "bottom"] = ny + "px";
  98                 Drag.obj.lastMouseX     = ex;
  99                 Drag.obj.lastMouseY     = ey;
 100
 101                 Drag.obj.root.onDrag(nx, ny);
 102                 return false;
 103         },
 104
 105         end : function()
 106         {
 107                 document.onmousemove = null;
 108                 document.onmouseup   = null;
 109                 Drag.obj.root.onDragEnd(        parseInt(Drag.obj.root.style[Drag.obj.hmode ? "left" : "right"]),
 110                                                                         parseInt(Drag.obj.root.style[Drag.obj.vmode ? "top" : "bottom"]));
 111                 Drag.obj = null;
 112         },
 113
 114         fixE : function(e)
 115         {
 116                 if (typeof e == 'undefined') e = window.event;
 117                 if (typeof e.layerX == 'undefined') e.layerX = e.offsetX;
 118                 if (typeof e.layerY == 'undefined') e.layerY = e.offsetY;
 119                 return e;
 120         }
 121 };