[Sommaire] [Imprimer]

   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  };