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 };