overlib.js

这个weblogging 设计得比较精巧

	self.status = "";

	if (over.onmouseout || over.onmouseover) {
		if (olNs4) over.releaseEvents(Event.MOUSEOUT || Event.MOUSEOVER);
		over.onmouseout = over.onmouseover = null;
	}

	runHook("hideObject", FAFTER);
}

// Move a layer
function repositionTo(obj, xL, yL) {
	var theObj=(olNs4 ? obj : obj.style);
	theObj.left = xL + (!olNs4 ? 'px' : 0);
	theObj.top = yL + (!olNs4 ? 'px' : 0);
}

// Check position of cursor relative to overDiv DIVision; mouseOut function
function cursorOff() {
	var left = parseInt(over.style.left);
	var top = parseInt(over.style.top);
	var right = left+over.offsetWidth;
	var bottom = top+ over.offsetHeight;

	if (o3_x < left || o3_x > right || o3_y < top || o3_y > bottom) return true;

	return false;
}


////////
// COMMAND FUNCTIONS
////////

// Calls callme or the default function.
function opt_FUNCTION(callme) {
	o3_text = (callme ? (typeof callme=='string' ? (/.+\(.*\)/.test(callme) ? eval(callme) : callme) : callme()) : (o3_function ? o3_function() : 'No Function'));

	return 0;
}

// Handle hovering
function opt_NOCLOSE(unused) {
	if (!unused) o3_close = "";

	if (olNs4) {
		over.captureEvents(Event.MOUSEOUT || Event.MOUSEOVER);
		over.onmouseover = function () { if (o3_timerid > 0) { clearTimeout(o3_timerid); o3_timerid = 0; } }
		over.onmouseout = cClick;
	} else {
		over.onmouseover = function () {hoveringSwitch = true; if (o3_timerid > 0) { clearTimeout(o3_timerid); o3_timerid =0; } }
	}

	return 0;
}

// Function to scan command line arguments for multiples
function opt_MULTIPLEARGS(i, args, parameter) {
  var k = i, l, re, pV, str = '';

  for(k=i; k<args.length; k++) {
		str += args[k] + ',';
		if(typeof args[k] == 'number'&&args[k]>pmStart) break;
	}
  if(k >= args.length) l = str.length-1;
  else {
    re = eval('/,' + args[k] + '/');
    l = str.search(re);
  }

	k--;  // reduce by one so the for loop this is in works correctly
	str = str.substring(0, l);
	pV = (olNs4&&/cellpad/i.test(parameter)) ? str.split(',')[0] : str;
	eval(parameter + '="' + pV + '"');

	return k;
}

// Remove &nbsp; in texts when done.
function nbspCleanup() {
	if (o3_wrap && (olOp || (olIe4 && isMac))) {
		o3_text = o3_text.replace(/\&nbsp;/g, ' ');
		o3_cap = o3_cap.replace(/\&nbsp;/g, ' ');
	}
}

// Escape embedded single quotes in text strings
function escSglQuote(str) {
  return str.toString().replace(/'/g,"\\'");
}

// Onload handler for window onload event
function OLonLoad_handler(e) {
	if (!olLoaded) olLoaded=1;  // indicates that all modules have loaded now

	// remove the OLonload_handler for Ns6+, Mozilla based browsers, and IE
	if (window.removeEventListener) window.removeEventListener("load",OLonLoad_handler,true);
	else if (window.detachEvent) window.detachEvent("onload",OLonLoad_handler);
	
	// Route the event to the normal handler in Nx4.x
	if (olNs4) routeEvent(e);
}

// Wraps strings in Layer Generation Functions with the correct tags
//    endWrap true(if end tag) or false if start tag
//    fontSizeStr - font size string such as '1' or '10px'
//    whichString is being wrapped -- 'text', 'caption', or 'close'
function wrapStr(endWrap,fontSizeStr,whichString) {
	var fontStr, fontColor, isClose=((whichString=='close') ? 1 : 0), hasDims=/[%\-a-z]+$/.test(fontSizeStr);
	fontSizeStr = (olNs4) ? (!hasDims ? fontSizeStr : '1') : fontSizeStr;
	if (endWrap) return (hasDims&&!olNs4) ? (isClose ? '</span>' : '</div>') : '</font>';
	else {
		fontStr='o3_'+whichString+'font';
		fontColor='o3_'+((whichString=='caption')? 'cap' : whichString)+'color';
		return (hasDims&&!olNs4) ? (isClose ? '<span style="font-family: '+quoteMultiNameFonts(eval(fontStr))+'; color: '+eval(fontColor)+'; font-size: '+fontSizeStr+';">' : '<div style="font-family: '+quoteMultiNameFonts(eval(fontStr))+'; color: '+eval(fontColor)+'; font-size: '+fontSizeStr+';">') : '<font face="'+eval(fontStr)+'" color="'+eval(fontColor)+'" size="'+(parseInt(fontSizeStr)>7 ? '7' : fontSizeStr)+'">';
	}
}

// Quotes Multi word font names; needed for CSS Standards adherence in font-family
function quoteMultiNameFonts(theFont) {
	var v, pM=theFont.split(',');
	for (var i=0; i<pM.length; i++) {
		v=pM[i];
		v=v.replace(/^\s+/,'').replace(/\s+$/,'');
		if(/\s/.test(v) && !/['"]/.test(v)) {
			v="\'"+v+"\'";
			pM[i]=v;
		}
	}
	return pM.join();
}

// dummy function which will be overridden 
function isExclusive(args) {
	return false;
}
////////
//  PLUGIN ACTIVATION FUNCTIONS
////////

// Runs plugin functions to set runtime variables.
function setRunTimeVariables(){
	if (typeof runTime != 'undefined' && runTime.length) {
		for (var k = 0; k < runTime.length; k++) {
			runTime[k]();
		}
	}
}

// Runs plugin functions to parse commands.
function parseCmdLine(pf, i, args) {
	if (typeof cmdLine != 'undefined' && cmdLine.length) { 
		for (var k = 0; k < cmdLine.length; k++) { 
			var j = cmdLine[k](pf, i, args);
			if (j >- 1) {
				i = j;
				break;
			}
		}
	}

	return i;
}

// Runs plugin functions to do things after parse.
function postParseChecks(){
	if (typeof postParse != 'undefined' && postParse.length) {
		for (var k = 0; k < postParse.length; k++) {
			if (postParse[k]()) continue;
			return false;  // end now since have an error
		}
	}
	return true;
}


////////
//  PLUGIN REGISTRATION FUNCTIONS
////////

// Registers commands and creates constants.
function registerCommands(cmdStr) {
	if (typeof cmdStr!='string') return;

	var pM = cmdStr.split(',');
	pms = pms.concat(pM);

	for (var i = 0; i< pM.length; i++) {
		eval(pM[i].toUpperCase()+'='+pmCount++);
	}
}

// Register a function to hook at a certain point.
function registerHook(fnHookTo, fnRef, hookType, optPm) {
	var hookPt, last = typeof optPm;
	
	if (fnHookTo == 'plgIn'||fnHookTo == 'postParse') return;
	if (typeof hookPts == 'undefined') hookPts = new Array();
	if (typeof hookPts[fnHookTo] == 'undefined') hookPts[fnHookTo] = new FunctionReference();

	hookPt = hookPts[fnHookTo];

	if (hookType != null) {
		if (hookType == FREPLACE) {
			hookPt.ovload = fnRef;  // replace normal overlib routine
			if (fnHookTo.indexOf('ol_content_') > -1) hookPt.alt[pms[CSSOFF-1-pmStart]]=fnRef; 

		} else if (hookType == FBEFORE || hookType == FAFTER) {
			var hookPt=(hookType == 1 ? hookPt.before : hookPt.after);

			if (typeof fnRef == 'object') {
				hookPt = hookPt.concat(fnRef);
			} else {
				hookPt[hookPt.length++] = fnRef;
			}

			if (optPm) hookPt = reOrder(hookPt, fnRef, optPm);

		} else if (hookType == FALTERNATE) {
			if (last=='number') hookPt.alt[pms[optPm-1-pmStart]] = fnRef;
		}

		return;
	}
}

// Register a function that will set runtime variables.
function registerRunTimeFunction(fn) {
	if (isFunction(fn)) {
		if (typeof runTime == 'undefined') runTime = new Array();
		if (typeof fn == 'object') {
			runTime = runTime.concat(fn);
		} else {
			runTime[runTime.length++] = fn;
		}
	}
}

// Register a function that will handle command parsing.
function registerCmdLineFunction(fn){
	if (isFunction(fn)) {
		if (typeof cmdLine == 'undefined') cmdLine = new Array();
		if (typeof fn == 'object') {
			cmdLine = cmdLine.concat(fn);
		} else {
			cmdLine[cmdLine.length++] = fn;
		}
	}
}

// Register a function that does things after command parsing. 
function registerPostParseFunction(fn){
	if (isFunction(fn)) {
		if (typeof postParse == 'undefined') postParse = new Array();
		if (typeof fn == 'object') {
			postParse = postParse.concat(fn);
		} else {
			postParse[postParse.length++] = fn;
		}
	}
}

////////
//  PLUGIN REGISTRATION FUNCTIONS
////////

// Runs any hooks registered.
function runHook(fnHookTo, hookType) {
	var l = hookPts[fnHookTo], optPm, arS, ar = runHook.arguments;

	if (hookType == FREPLACE) {
		arS = argToString(ar, 2);

		if (typeof l == 'undefined' || !(l = l.ovload)) return eval(fnHookTo+'('+arS+')');
		else return eval('l('+arS+')');

	} else if (hookType == FBEFORE || hookType == FAFTER) {
		if (typeof l == 'undefined') return;
		l=(hookType == 1 ? l.before : l.after);

		if (!l.length) return;

		arS = argToString(ar, 2);
		for (var k = 0; k < l.length; k++) eval('l[k]('+arS+')'); 

	} else if (hookType == FALTERNATE) {
		optPm = ar[2];
		arS = argToString(ar, 3);

		if (typeof l == 'undefined' || (l = l.alt[pms[optPm-1-pmStart]]) == 'undefined') {
			return eval(fnHookTo+'('+arS+')');
		} else {
			return eval('l('+arS+')');
		}
	}
}

////////
//  UTILITY FUNCTIONS
////////

// Checks if something is a function.
function isFunction(fnRef) {
	var rtn = true;

	if (typeof fnRef == 'object') {
		for (var i = 0; i < fnRef.length; i++) {
			if (typeof fnRef[i]=='function') continue;
			rtn = false;
			break;
		}
	} else if (typeof fnRef != 'function') {
		rtn = false;
	}
	
	return rtn;
}

// Converts an array into an argument string for use in eval.
function argToString(array, strtInd, argName) {
	var jS = strtInd, aS = '', ar = array;
	argName=(argName ? argName : 'ar');
	
	if (ar.length > jS) {
		for (var k = jS; k < ar.length; k++) aS += argName+'['+k+'], ';
		aS = aS.substring(0, aS.length-2);
	}
	
	return aS;
}

// Places a hook in the correct position in a hook point.
function reOrder(hookPt, fnRef, order) {
	if (!order || typeof order == 'undefined' || typeof order == 'number') return;
	
	var newPt = new Array(), match;

	if (typeof order=='function') {
		if (typeof fnRef=='object') {
			newPt = newPt.concat(fnRef);
		} else {
			newPt[newPt.length++]=fnRef;
		}
		
		for (var i = 0; i < hookPt.length; i++) {
			match = false;
			if (typeof fnRef == 'function' && hookPt[i] == fnRef) {
				continue;
			} else {
				for(var j = 0; j < fnRef.length; j++) if (hookPt[i] == fnRef[j]) {
					match = true;
					break;
				}
			}
			if (!match) newPt[newPt.length++] = hookPt[i];
		}

		newPt[newPt.length++] = order;

	} else if (typeof order == 'object') {
		if (typeof fnRef == 'object') {
			newPt = newPt.concat(fnRef);
		} else {
			newPt[newPt.length++] = fnRef;
		}
		
		for (var j = 0; j < hookPt.length; j++) {
			match = false;
			if (typeof fnRef == 'function' && hookPt[j] == fnRef) {
				continue;
			} else {
				for (var i = 0; i < fnRef.length; i++) if (hookPt[j] == fnRef[i]) {
					match = true;
					break;
				}
			}
			if (!match) newPt[newPt.length++]=hookPt[j];
		}

		for (i = 0; i < newPt.length; i++) hookPt[i] = newPt[i];
		newPt.length = 0;
		
		for (var j = 0; j < hookPt.length; j++) {
			match = false;
			for (var i = 0; i < order.length; i++) {
				if (hookPt[j] == order[i]) {
					match = true;
					break;
				}
			}
			if (!match) newPt[newPt.length++] = hookPt[j];
		}
		newPt = newPt.concat(order);
	}

	for(i = 0; i < newPt.length; i++) hookPt[i] = newPt[i];

	return hookPt;
}

////////
// OBJECT CONSTRUCTORS
////////

// Object for handling hooks.
function FunctionReference() {
	this.ovload = null;
	this.before = new Array();
	this.after = new Array();
	this.alt = new Array();
}

// Object for simple access to the overLIB version used.
// Examples: simpleversion:351 major:3 minor:5 revision:1
function Info(version, prerelease) {
	this.version = version;
	this.prerelease = prerelease;

	this.simpleversion = parseInt(this.version*100);
	this.major = parseInt(this.simpleversion / 100);
	this.minor = parseInt(this.simpleversion / 10) - this.major * 10;
	this.revision = parseInt(this.simpleversion) - this.major * 100 - this.minor * 10;
}



////////
// STANDARD REGISTRATIONS
////////
registerHook("ol_content_simple", ol_content_simple, FALTERNATE, CSSOFF);
registerHook("ol_content_caption", ol_content_caption, FALTERNATE, CSSOFF);
registerHook("ol_content_background", ol_content_background, FALTERNATE, CSSOFF);
registerHook("ol_content_simple", ol_content_simple, FALTERNATE, CSSCLASS);
registerHook("ol_content_caption", ol_content_caption, FALTERNATE, CSSCLASS);
registerHook("ol_content_background", ol_content_background, FALTERNATE, CSSCLASS);
registerHook("hideObject", nbspCleanup, FAFTER);