https://www.realsar.com/forum/jscripts/dom-drag.js

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 * IPS CHANGES
10 * 06.01.2005 - Added "cursorchange" to change
11 * 07.18.2005 - Added cookie to store values
12 * 07.18.2005 - Made it impossible to drag < 0 height (keeponscreen)
13 * mouse cursor when over drag handle
14 **************************************************/
15
16
17var Drag = {
18
19	obj		    : null,
20	fx		    : null,
21	fy		    : null,
22	cookiename  : null,
23	keeponscreen: true,
24	
25	init : function(o, oRoot, minX, maxX, minY, maxY, bSwapHorzRef, bSwapVertRef, fXMapper, fYMapper)
26	{
27		o.onmousedown	= Drag.start;
28		o.onmouseover   = Drag.cursorchange;
29		
30		o.hmode			= bSwapHorzRef ? false : true ;
31		o.vmode			= bSwapVertRef ? false : true ;
32
33		o.root = oRoot && oRoot != null ? oRoot : o ;
34
35		if (o.hmode  && isNaN(parseInt(o.root.style.left  ))) o.root.style.left   = "0px";
36		if (o.vmode  && isNaN(parseInt(o.root.style.top   ))) o.root.style.top    = "0px";
37		if (!o.hmode && isNaN(parseInt(o.root.style.right ))) o.root.style.right  = "0px";
38		if (!o.vmode && isNaN(parseInt(o.root.style.bottom))) o.root.style.bottom = "0px";
39
40		o.minX	= typeof minX != 'undefined' ? minX : null;
41		o.minY	= typeof minY != 'undefined' ? minY : null;
42		o.maxX	= typeof maxX != 'undefined' ? maxX : null;
43		o.maxY	= typeof maxY != 'undefined' ? maxY : null;
44
45		o.xMapper = fXMapper ? fXMapper : null;
46		o.yMapper = fYMapper ? fYMapper : null;
47		
48		//----------------------------------
49		// Figure width and height
50		//----------------------------------
51		
52		if ( Drag.keeponscreen )
53		{
54			Drag.my_width  = 0;
55			Drag.my_height = 0;
56			
57			if ( typeof( window.innerWidth ) == 'number' )
58			{
59				//----------------------------------
60				// Non IE
61				//----------------------------------
62			  
63				Drag.my_width  = window.innerWidth;
64				Drag.my_height = window.innerHeight;
65			}
66			else if ( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) )
67			{
68				//----------------------------------
69				// IE 6+
70				//----------------------------------
71				
72				Drag.my_width  = document.documentElement.clientWidth;
73				Drag.my_height = document.documentElement.clientHeight;
74			}
75			else if ( document.body && ( document.body.clientWidth || document.body.clientHeight ) )
76			{
77				//----------------------------------
78				// Old IE
79				//----------------------------------
80				
81				Drag.my_width  = document.body.clientWidth;
82				Drag.my_height = document.body.clientHeight;
83			}
84		}
85		
86		o.root.onDragStart	= new Function();
87		o.root.onDragEnd	= new Function();
88		o.root.onDrag		= new Function();
89	},
90	
91	cursorchange : function(e)
92	{
93		var o = Drag.obj = this;
94		o.style.cursor = 'move';
95	},
96
97	start : function(e)
98	{
99		var o = Drag.obj = this;
100		e = Drag.fixE(e);
101		var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
102		var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
103		o.root.onDragStart(x, y);
104
105		o.lastMouseX	= e.clientX;
106		o.lastMouseY	= e.clientY;
107
108		if (o.hmode) {
109			if (o.minX != null)	o.minMouseX	= e.clientX - x + o.minX;
110			if (o.maxX != null)	o.maxMouseX	= o.minMouseX + o.maxX - o.minX;
111		} else {
112			if (o.minX != null) o.maxMouseX = -o.minX + e.clientX + x;
113			if (o.maxX != null) o.minMouseX = -o.maxX + e.clientX + x;
114		}
115
116		if (o.vmode) {
117			if (o.minY != null)	o.minMouseY	= e.clientY - y + o.minY;
118			if (o.maxY != null)	o.maxMouseY	= o.minMouseY + o.maxY - o.minY;
119		} else {
120			if (o.minY != null) o.maxMouseY = -o.minY + e.clientY + y;
121			if (o.maxY != null) o.minMouseY = -o.maxY + e.clientY + y;
122		}
123
124		document.onmousemove	= Drag.drag;
125		document.onmouseup		= Drag.end;
126
127		return false;
128	},
129
130	drag : function(e)
131	{
132		e = Drag.fixE(e);
133		var o = Drag.obj;
134
135		var ey	= e.clientY;
136		var ex	= e.clientX;
137		var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
138		var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
139		var nx, ny;
140
141		if (o.minX != null) ex = o.hmode ? Math.max(ex, o.minMouseX) : Math.min(ex, o.maxMouseX);
142		if (o.maxX != null) ex = o.hmode ? Math.min(ex, o.maxMouseX) : Math.max(ex, o.minMouseX);
143		if (o.minY != null) ey = o.vmode ? Math.max(ey, o.minMouseY) : Math.min(ey, o.maxMouseY);
144		if (o.maxY != null) ey = o.vmode ? Math.min(ey, o.maxMouseY) : Math.max(ey, o.minMouseY);
145
146		nx = x + ((ex - o.lastMouseX) * (o.hmode ? 1 : -1));
147		ny = y + ((ey - o.lastMouseY) * (o.vmode ? 1 : -1));
148
149		if (o.xMapper)		nx = o.xMapper(y)

150		else if (o.yMapper)	ny = o.yMapper(x)
151		
152		//----------------------------------
153		// Keep on screen?
154		//----------------------------------
155		
156		if ( Drag.keeponscreen )
157		{
158			ny = ny < 0 ? 0 : ny;
159			nx = nx < 0 ? 0 : nx;
160			
161			if ( Drag.my_width )
162			{
163				nx = nx > Drag.my_width - parseInt(o.root.style.width) ? Drag.my_width - parseInt(o.root.style.width) : nx;
164			}
165		}
166		
167		Drag.obj.root.style[o.hmode ? "left" : "right"] = nx + "px";
168		Drag.obj.root.style[o.vmode ? "top" : "bottom"] = ny + "px";
169		Drag.obj.lastMouseX	= ex;
170		Drag.obj.lastMouseY	= ey;
171
172		Drag.obj.root.onDrag(nx, ny);
173		return false;
174	},
175
176	end : function()
177	{
178		document.onmousemove = null;
179		document.onmouseup   = null;
180		Drag.obj.root.onDragEnd(	parseInt(Drag.obj.root.style[Drag.obj.hmode ? "left" : "right"]), 
181									parseInt(Drag.obj.root.style[Drag.obj.vmode ? "top" : "bottom"]));
182		
183		var o = Drag.obj;
184		
185		fy = parseInt( o.root.style.top );
186		fx = parseInt( o.root.style.left );
187		
188		//----------------------------------
189		// Store in a cookie?
190		//----------------------------------
191		
192		if ( Drag.cookiename )
193		{
194			try
195			{
196				my_setcookie( Drag.cookiename, fx+','+fy, 1 );
197			}
198			catch(e)
199			{
200			}
201		}
202		
203		Drag.obj = null;
204		
205	},
206
207	fixE : function(e)
208	{
209		if (typeof e == 'undefined') e = window.event;
210		if (typeof e.layerX == 'undefined') e.layerX = e.offsetX;
211		if (typeof e.layerY == 'undefined') e.layerY = e.offsetY;
212		return e;
213	}
214};