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