https://cbgame.org/admode/common/script/plugin/dom.drag.js

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
11var 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};