[Sommaire] [Imprimer]

   1  /**************************************************
   2   * dom-drag.js
   3   * 09.25.2001
   4   * www.youngpup.net
   5   * Script featured on Dynamic Drive (http://www.dynamicdrive.com) 12.08.2005
   6   **************************************************
   7   * 10.28.2001 - fixed minor bug where events
   8   * sometimes fired off the handle, not the root.
   9   **************************************************/
  10  
  11  var Drag = {
  12  
  13      obj : null,
  14  
  15      init : function(o, oRoot, minX, maxX, minY, maxY, bSwapHorzRef, bSwapVertRef, fXMapper, fYMapper)
  16      {
  17          o.onmousedown    = Drag.start;
  18  
  19          o.hmode            = bSwapHorzRef ? false : true ;
  20          o.vmode            = bSwapVertRef ? false : true ;
  21  
  22          o.root = oRoot && oRoot != null ? oRoot : o ;
  23  
  24          if (o.hmode  && isNaN(parseInt(o.root.style.left  ))) o.root.style.left   = "0px";
  25          if (o.vmode  && isNaN(parseInt(o.root.style.top   ))) o.root.style.top    = "0px";
  26          if (!o.hmode && isNaN(parseInt(o.root.style.right ))) o.root.style.right  = "0px";
  27          if (!o.vmode && isNaN(parseInt(o.root.style.bottom))) o.root.style.bottom = "0px";
  28  
  29          o.minX    = typeof minX != 'undefined' ? minX : null;
  30          o.minY    = typeof minY != 'undefined' ? minY : null;
  31          o.maxX    = typeof maxX != 'undefined' ? maxX : null;
  32          o.maxY    = typeof maxY != 'undefined' ? maxY : null;
  33  
  34          o.xMapper = fXMapper ? fXMapper : null;
  35          o.yMapper = fYMapper ? fYMapper : null;
  36  
  37          o.root.onDragStart    = new Function();
  38          o.root.onDragEnd    = new Function();
  39          o.root.onDrag        = new Function();
  40      },
  41  
  42      start : function(e)
  43      {
  44          var o = Drag.obj = this;
  45          e = Drag.fixE(e);
  46          var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
  47          var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
  48          o.root.onDragStart(x, y);
  49  
  50          o.lastMouseX    = e.clientX;
  51          o.lastMouseY    = e.clientY;
  52  
  53          if (o.hmode) {
  54              if (o.minX != null)    o.minMouseX    = e.clientX - x + o.minX;
  55              if (o.maxX != null)    o.maxMouseX    = o.minMouseX + o.maxX - o.minX;
  56          } else {
  57              if (o.minX != null) o.maxMouseX = -o.minX + e.clientX + x;
  58              if (o.maxX != null) o.minMouseX = -o.maxX + e.clientX + x;
  59          }
  60  
  61          if (o.vmode) {
  62              if (o.minY != null)    o.minMouseY    = e.clientY - y + o.minY;
  63              if (o.maxY != null)    o.maxMouseY    = o.minMouseY + o.maxY - o.minY;
  64          } else {
  65              if (o.minY != null) o.maxMouseY = -o.minY + e.clientY + y;
  66              if (o.maxY != null) o.minMouseY = -o.maxY + e.clientY + y;
  67          }
  68  
  69          document.onmousemove    = Drag.drag;
  70          document.onmouseup        = Drag.end;
  71  
  72          return false;
  73      },
  74  
  75      drag : function(e)
  76      {
  77          e = Drag.fixE(e);
  78          var o = Drag.obj;
  79  
  80          var ey    = e.clientY;
  81          var ex    = e.clientX;
  82          var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
  83          var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
  84          var nx, ny;
  85  
  86          if (o.minX != null) ex = o.hmode ? Math.max(ex, o.minMouseX) : Math.min(ex, o.maxMouseX);
  87          if (o.maxX != null) ex = o.hmode ? Math.min(ex, o.maxMouseX) : Math.max(ex, o.minMouseX);
  88          if (o.minY != null) ey = o.vmode ? Math.max(ey, o.minMouseY) : Math.min(ey, o.maxMouseY);
  89          if (o.maxY != null) ey = o.vmode ? Math.min(ey, o.maxMouseY) : Math.max(ey, o.minMouseY);
  90  
  91          nx = x + ((ex - o.lastMouseX) * (o.hmode ? 1 : -1));
  92          ny = y + ((ey - o.lastMouseY) * (o.vmode ? 1 : -1));
  93  
  94          if (o.xMapper)        nx = o.xMapper(y)
  95          else if (o.yMapper)    ny = o.yMapper(x)
  96  
  97          Drag.obj.root.style[o.hmode ? "left" : "right"] = nx + "px";
  98          Drag.obj.root.style[o.vmode ? "top" : "bottom"] = ny + "px";
  99          Drag.obj.lastMouseX    = ex;
 100          Drag.obj.lastMouseY    = ey;
 101  
 102          Drag.obj.root.onDrag(nx, ny);
 103          return false;
 104      },
 105  
 106      end : function()
 107      {
 108          document.onmousemove = null;
 109          document.onmouseup   = null;
 110          Drag.obj.root.onDragEnd(    parseInt(Drag.obj.root.style[Drag.obj.hmode ? "left" : "right"]), 
 111                                      parseInt(Drag.obj.root.style[Drag.obj.vmode ? "top" : "bottom"]));
 112          Drag.obj = null;
 113      },
 114  
 115      fixE : function(e)
 116      {
 117          if (typeof e == 'undefined') e = window.event;
 118          if (typeof e.layerX == 'undefined') e.layerX = e.offsetX;
 119          if (typeof e.layerY == 'undefined') e.layerY = e.offsetY;
 120          return e;
 121      }
 122  };
 123