wz_dragdrop.js

java版源代码,里面包含很多源代码,大家可以看看.

	for(var d_i in this)
		this[d_i] = null;
	dd.elements[this.name] = null;
};
dd.n4RectVis = function(vis)
{
	for(var d_i = 4; d_i--;)
	{
		dd.rectI[d_i].visibility = dd.rectA[d_i].visibility = vis? 'show' : 'hide';
		if(vis) dd.rectI[d_i].zIndex = dd.rectA[d_i].zIndex = dd.z+2;
	}
};
dd.n4RectPos = function(d_o, d_x, d_y, d_w, d_h)
{
	d_o.x = d_x;
	d_o.y = d_y;
	d_o.clip.width = d_w;
	d_o.clip.height = d_h;
};
// NN4: draw img resize rectangle
dd.n4Rect = function(d_w, d_h)
{
	var d_i;
	if(!dd.rectI)
	{
		dd.rectI = new Array();
		dd.rectA = new Array();
	}
	if(!dd.rectI[0])
	{
		for(d_i = 4; d_i--;)
		{
			(dd.rectI[d_i] = new Layer(1)).bgColor = '#000000';
			(dd.rectA[d_i] = new Layer(1)).bgColor = '#ffffff';
		}
	}
	if(!dd.rectI[0].visibility || dd.rectI[0].visibility == 'hide') dd.n4RectVis(1);
	dd.obj.w = d_w;
	dd.obj.h = d_h;
	for(d_i = 4; d_i--;)
	{
		dd.n4RectPos(dd.rectI[d_i], dd.obj.x + (!(d_i-1)? (dd.obj.w-1) : 0), dd.obj.y + (!(d_i-2)? (dd.obj.h-1) : 0), d_i&1 || dd.obj.w, !(d_i&1) || dd.obj.h);
		dd.n4RectPos(dd.rectA[d_i], !(d_i-1)? dd.rectI[1].x+1 : (dd.obj.x-1), !(d_i-2)? dd.rectI[2].y+1 : (dd.obj.y-1), d_i&1 || dd.obj.w+2, !(d_i&1) || dd.obj.h+2);
	}
};
dd.reszTo = function(d_w, d_h)
{
	if(dd.n4 && dd.obj.is_image) dd.n4Rect(d_w, d_h);
	else dd.obj.resizeTo(d_w, d_h);
};
dd.embedVis = function(d_vis)
{
	var d_o = new Array('iframe', 'applet', 'embed', 'object');
	var d_i = d_o.length; while(d_i--)
	{
		var d_p = dd.ie? document.all.tags(d_o[d_i]) : document.getElementsByTagName? document.getElementsByTagName(d_o[d_i]) : null;
		if(d_p)
		{
			var d_j = d_p.length; while(d_j--)
			{
				var d_q = d_p[d_j];
				while(d_q.offsetParent || d_q.parentNode)
				{
					if((d_q = d_q.parentNode || d_q.offsetParent || null) == dd.obj.div)
					{
						d_p[d_j].style.visibility = d_vis;
						break;
					}
				}
			}
		}
	}
};

dd.maxOffX = function(d_x, d_y)
{
	return(
		(dd.obj.maxoffl+1 && (d_y = dd.obj.defx-dd.obj.maxoffl)-d_x > 0
		|| dd.obj.maxoffr+1 && (d_y = dd.obj.defx+dd.obj.maxoffr)-d_x < 0)? d_y
		: d_x
	);
};
dd.maxOffY = function(d_x, d_y)
{
	return(
		(dd.obj.maxofft+1 && (d_y = dd.obj.defy-dd.obj.maxofft)-d_x > 0
		|| dd.obj.maxoffb+1 && (d_y = dd.obj.defy+dd.obj.maxoffb)-d_x < 0)? d_y
		: d_x
	);
};
dd.inWndW = function(d_x, d_y)
{
	var d_wx = dd.getScrollX(),
	d_ww = dd.getWndW();
	return(
		((d_y = d_wx+2)-d_x > 0) || ((d_y = d_wx+d_ww+dd.obj.w-2)-d_x < 0)? d_y
		: d_x
	);
};
dd.inWndH = function(d_x, d_y)
{
	var d_wy = dd.getScrollY(),
	d_wh = dd.getWndH();
	return(
		((d_y = d_wy+2)-d_x > 0) || ((d_y = d_wy+d_wh+dd.obj.h-2)-d_x < 0)? d_y
		: d_x
	);
};
// These two funcs limit the size of element when mouseresized.
// Implemented 22.5.2003 by Gregor Ltolf <[e-mail]>, modified by Walter Zorn
dd.limW = function(d_w)
{
	return(
		(dd.obj.minw-d_w > 0)? dd.obj.minw
		: (dd.obj.maxw > 0 && dd.obj.maxw-d_w < 0)? dd.obj.maxw
		: d_w
	);
};
dd.limH = function(d_h)
{
	return(
		(dd.obj.minh-d_h > 0)? dd.obj.minh
		: (dd.obj.maxh > 0 && dd.obj.maxh-d_h < 0)? dd.obj.maxh
		: d_h
	);
};
// Optional autoscroll-page functionality. Courtesy Cedric Savarese.
// Implemented by Walter Zorn
function DDScroll()
{
	if(!dd.obj || !dd.obj.scroll && !dd.scroll || dd.ie4 || dd.whratio)
	{
		dd.scrx = dd.scry = 0;
		return;
	}
	var d_bnd = 0x1c,
	d_wx = dd.getScrollX(), d_wy = dd.getScrollY();
	if(dd.msmoved)
	{
		var d_ww = dd.getWndW(), d_wh = dd.getWndH(), d_y;
		dd.scrx = ((d_y = dd.e.x-d_ww-d_wx+d_bnd) > 0)? (d_y>>=2)*d_y
			: ((d_y = d_wx+d_bnd-dd.e.x) > 0)? -(d_y>>=2)*d_y
			: 0;
		dd.scry = ((d_y = dd.e.y-d_wh-d_wy+d_bnd) > 0)? (d_y>>=2)*d_y
			: ((d_y = d_wy+d_bnd-dd.e.y) > 0)? -(d_y>>=2)*d_y
			: 0;
	}
	if(dd.scrx || dd.scry)
	{
		window.scrollTo(
			d_wx + (dd.scrx = dd.obj.is_resized? dd.limW(dd.obj.w+dd.scrx)-dd.obj.w : dd.obj.vertical? 0 : (dd.maxOffX(dd.obj.x+dd.scrx)-dd.obj.x)),
			d_wy + (dd.scry = dd.obj.is_resized? dd.limH(dd.obj.h+dd.scry)-dd.obj.h : dd.obj.horizontal? 0 : (dd.maxOffY(dd.obj.y+dd.scry)-dd.obj.y))
		);
		dd.obj.is_dragged? dd.obj.moveTo(dd.obj.x+dd.getScrollX()-d_wx, dd.obj.y+dd.getScrollY()-d_wy)
			: dd.reszTo(dd.obj.w+dd.getScrollX()-d_wx, dd.obj.h+dd.getScrollY()-d_wy);
	}
	dd.msmoved = 0;
	window.setTimeout('DDScroll()', 0x33);
}
function PICK(d_ev)
{
	dd.e = new dd.evt(d_ev);
	if(dd.e.x >= dd.getWndW()+dd.getScrollX() || dd.e.y >= dd.getWndH()+dd.getScrollY()) return true; // on scrollbar
	var d_o, d_t, d_cmp = -1, d_i = dd.elements.length; while(d_i--)
	{
		d_o = dd.elements[d_i];
		if(dd.n4 && dd.e.but > 1 && dd.e.src == d_o.oimg && !d_o.clone) return false;
		if(d_o.visible && dd.e.but <= 1 && dd.e.x >= d_o.x && dd.e.x <= d_o.x+d_o.w && dd.e.y >= d_o.y && dd.e.y <= d_o.y+d_o.h)
		{
			if(d_o.z > d_cmp && (d_t = dd.e.src.tag).indexOf('inpu') < 0 && d_t.indexOf('texta') < 0 && d_t.indexOf('sele') < 0 && d_t.indexOf('opti') < 0 && d_t.indexOf('scrol') < 0)
			{
				d_cmp = d_o.z;
				dd.obj = d_o;
			}
		}
	}
	if(dd.obj)
	{
		if(dd.obj.nodrag) dd.obj = null;
		else
		{
			dd.e.e.cancelBubble = true;
			var d_rsz = dd.e.modifKey && (dd.obj.resizable || dd.obj.scalable);
			if(dd.op)
			{
				(d_o = document.getElementById('OpBlUr')).style.pixelLeft = dd.e.x;
				d_o.style.pixelTop = dd.e.y;
				(d_o = d_o.children[0].children[0]).focus();
				d_o.blur();
			}
			else if(dd.ie && !dd.ie4)
			{
				if(document.selection && document.selection.empty) document.selection.empty();
				dd.db.onselectstart = function()
				{
					event.returnValue = false;
				};
			}
			if(d_rsz)
			{
				dd.obj._setCrs('se-resize');
				dd.obj.is_resized = 1;
				dd.whratio = dd.obj.scalable? dd.obj.defw/dd.obj.defh : 0;
				if(dd.ie)
				{
					if(dd.ie4)
					{
						window.dd_x = dd.getScrollX();
						window.dd_y = dd.getScrollY();
					}
					setTimeout(
						'if(dd.obj && document.selection && document.selection.empty)'+
						'{'+
							'document.selection.empty();'+
							'if(dd.ie4) window.scrollTo(window.dd_x, window.dd_y);'+
						'}'
					,0);
				}
				dd.setMovHdl(RESIZE);
				dd.reszTo(dd.obj.w, dd.obj.h);
			}
			else
			{
				dd.obj.is_dragged = 1;
				dd.setMovHdl(DRAG);
			}
			dd.setUpHdl(DROP);
			dd.embedVis('hidden');
			dd.obj._setOpaRel(0.7);
			dd.obj.maximizeZ();
			dd.ofx = dd.obj.x+dd.obj.w-dd.e.x;
			dd.ofy = dd.obj.y+dd.obj.h-dd.e.y;
			if(window.my_PickFunc) my_PickFunc();
			if(dd.obj.pickFunc) dd.obj.pickFunc();
			DDScroll();
			return !(
				dd.obj.is_resized
				|| dd.n4 && dd.obj.is_image
				|| dd.n6 || dd.w3c
			);
		}
	}
	if(dd.downFunc) return dd.downFunc(d_ev);
	return true;
}
function DRAG(d_ev)
{
	if(!dd.obj || !dd.obj.visible) return true;
	if(dd.ie4 || dd.w3c || dd.n6 || dd.obj.children.length > 0xf)
	{
		if(dd.wait) return false;
		dd.wait = 1;
		setTimeout('dd.wait = 0;', dd.tiv);
	}
	dd.e = new dd.evt(d_ev);
	if(dd.ie && !dd.e.but)
	{
		DROP(d_ev);
		return true;
	}
	dd.msmoved = 1;
	dd.obj.moveTo(
		dd.obj.vertical? dd.obj.x : dd.maxOffX(dd.inWndW(dd.ofx+dd.e.x)-dd.obj.w),
		dd.obj.horizontal? dd.obj.y : dd.maxOffY(dd.inWndH(dd.ofy+dd.e.y)-dd.obj.h)
	);

	if(window.my_DragFunc) my_DragFunc();
	if(dd.obj.dragFunc) dd.obj.dragFunc();
	if(dd.moveFunc) return dd.moveFunc(d_ev);
	return false;
}
function RESIZE(d_ev)
{
	if(!dd.obj || !dd.obj.visible) return true;
	if(dd.wait) return false;
	dd.wait = 1;
	setTimeout('dd.wait = 0;', dd.tiv);
	dd.e = new dd.evt(d_ev);
	if(dd.ie && !dd.e.but)
	{
		DROP(d_ev);
		return true;
	}
	dd.msmoved = 1;
	var d_w = dd.limW(dd.inWndW(dd.ofx+dd.e.x)-dd.obj.x), d_h;
	if(!dd.whratio) d_h = dd.limH(dd.inWndH(dd.ofy+dd.e.y)-dd.obj.y);
	else
	{
		d_h = dd.limH(dd.inWndH(Math.round(d_w/dd.whratio)+dd.obj.y)-dd.obj.y);
		d_w = Math.round(d_h*dd.whratio);
	}
	dd.reszTo(d_w, d_h);
	if(window.my_ResizeFunc) my_ResizeFunc();
	if(dd.obj.resizeFunc) dd.obj.resizeFunc();
	if(dd.moveFunc) return dd.moveFunc(d_ev);
	return false;
}
function DROP(d_ev)
{
	if(dd.obj)
	{
		if(dd.obj.is_dragged)
		{
			if(!dd.obj.is_image) dd.getWH(dd.obj);
		}
		else if(dd.n4)
		{
			if(dd.obj.is_image)
			{
				dd.n4RectVis(0);
				dd.obj.resizeTo(dd.obj.w, dd.obj.h);
			}
		}
		if(!dd.n4 || !dd.obj.is_image) dd.recalc();
		dd.setMovHdl(dd.moveFunc);
		dd.setUpHdl(dd.upFunc);
		if(dd.db) dd.db.onselectstart = null;
		dd.obj._setOpaRel(1.0);
		dd.obj._setCrs(dd.obj.cursor);
		dd.embedVis('visible');
		dd.obj._resetZ();
		dd.e = new dd.evt(d_ev);
		if(window.my_DropFunc) my_DropFunc();
		if(dd.obj.dropFunc) dd.obj.dropFunc();
		dd.msmoved = dd.obj.is_dragged = dd.obj.is_resized = dd.whratio = 0;
		dd.obj = null;
	}
	dd.setDwnHdl(PICK);
}
function SET_DHTML()
{
	var d_a = arguments, d_ai, d_htm = '', d_o, d_i = d_a.length; while(d_i--)
	{
		if(!(d_ai = d_a[d_i]).indexOf('c:')) dd.cursor = d_ai.substring(2);
		else if(d_ai == NO_ALT) dd.noalt = 1;
		else if(d_ai == SCROLL) dd.scroll = 1;
		else if(d_ai == RESET_Z) dd.re_z = 1;
		else if(d_ai == RESIZABLE) dd.resizable = 1;
		else if(d_ai == SCALABLE) dd.scalable = 1;
		else if(d_ai == TRANSPARENT) dd.diaphan = 1;
		else
		{
			d_o = new DDObj(d_ai);
			dd.addElt(d_o);
			d_htm += d_o.t_htm || '';
			if(d_o.oimg && d_o.cpy_n)
			{
				var d_j = 0; while(d_j < d_o.cpy_n)
				{
					var d_p = new DDObj(d_o.name+d_o.cmd, ++d_j);
					dd.addElt(d_p, d_o);
					d_p.defz = d_o.defz+d_j;
					d_p.original = d_o;
					d_htm += d_p.t_htm;
				}
			}
		}
	}
	if (dd.n4 || dd.n6 || dd.ie || dd.op || dd.w3c) document.write(
		(dd.n4? '<div style="position:absolute;"><\/div>\n'
		: (dd.op && !dd.op6)? '<div id="OpBlUr" style="position:absolute;visibility:hidden;width:0px;height:0px;"><form><input type="text" style="width:0px;height:0px;"><\/form><\/div>'
		: '') + d_htm
	);
	dd.z = 0x33;
	d_i = dd.elements.length; while(d_i--)
	{
		dd.addProps(d_o = dd.elements[d_i]);
		if(d_o.is_image && !d_o.original && !d_o.clone)
			dd.n4? d_o.oimg.src = spacer : d_o.oimg.style.visibility = 'hidden';
	}
	dd.mkWzDom();
	if(window.onload) dd.loadFunc = window.onload;
	if(window.onunload) dd.uloadFunc = window.onunload;
	window.onload = dd.initz;
	window.onunload = dd.finlz;
	dd.setDwnHdl(PICK);
}
function ADD_DHTML(d_o) // layers only!
{
	d_o = new DDObj(d_o);
	dd.addElt(d_o);
	dd.addProps(d_o);
	dd.mkWzDom();
}




////////////////////////////////////////////////////////////
// If not needed, all code below this line may be removed


// For backward compatibility
dd.d = document;			// < v. 2.72
var RESET_ZINDEX = RESET_Z; // < 3.44
var KEYDOWN_RESIZE = RESIZABLE; // < 4.43
var CURSOR_POINTER = CURSOR_HAND; // < 4.44
var NO_SCROLL = '';		 // < v. 4.49




////////////////////////////////////////////////////////////
// FUNCTIONS FOR EXTENDED SCRIPTING
// Use these for your own extensions,
// or to call functions defined elsewhere



/* my_PickFunc IS AUTOMATICALLY CALLED WHEN AN ITEM STARTS TO BE DRAGGED.
The following objects/properties are accessible from here:

- dd.e: current mouse event
- dd.e.property: access to a property of the current mouse event.
  Mostly requested properties:
  - dd.e.x: document-related x co-ordinate
  - dd.e.y: document-related y co-ord
  - dd.e.src: target of mouse event (not identical with the drag drop object itself).
  - dd.e.button: currently pressed mouse button. Left button: dd.e.button <= 1

- dd.obj: reference to currently dragged item.
- dd.obj.property: access to any property of that item.
- dd.obj.method(): for example dd.obj.resizeTo() or dd.obj.swapImage() .
  Mostly requested properties:
	- dd.obj.name: image name or layer ID passed to SET_DHTML();
	- dd.obj.x and dd.obj.y: co-ordinates;
	- dd.obj.w and dd.obj.h: size;
	- dd.obj.is_dragged: 1 while item is dragged, else 0;
	- dd.obj.is_resized: 1 while item is resized, i.e. if <ctrl> or <shift> is pressed, else 0

For more properties and details, visit the API documentation
at http://www.walterzorn.com/dragdrop/api_e.htm (english) or
http://www.walterzorn.de/dragdrop/api.htm (german)	*/
function my_PickFunc()
{
}




/* my_DragFunc IS CALLED WHILE AN ITEM IS DRAGGED
See the description of my_PickFunc above for what's accessible from here. */
function my_DragFunc()
{
	//window.status = 'dd.elements.' + dd.obj.name + '.x  = ' + dd.obj.x + '	 dd.elements.' + dd.obj.name + '.y = ' + dd.obj.y;
}




/* my_ResizeFunc IS CALLED WHILE AN ITEM IS RESIZED
See the description of my_PickFunc above for what's accessible from here. */
function my_ResizeFunc()
{
	//window.status = 'dd.elements.' + dd.obj.name + '.w  = ' + dd.obj.w + '	 dd.elements.' + dd.obj.name + '.h = ' + dd.obj.h;
}




/* THIS ONE IS CALLED ONCE AN ITEM IS DROPPED
See the description of my_PickFunc for what's accessible from here.
Here may be investigated, for example, what's the name (dd.obj.name)
of the dropped item, and where (dd.obj.x, dd.obj.y) it has been dropped... */
function my_DropFunc()
{
}