mm_menu.js

一个简单博客的软件项目,可以给初学者一个引导

	window.ActiveMenuItem = 0;
}

function MM_showMenu(menu, x, y, child, imgname) {
	if (!window.mmWroteMenu) return;
	MM_clearTimeout();
	if (menu) {
		var obj = FIND(imgname) || document.images[imgname] || document.links[imgname] || document.anchors[imgname];
		x = moveXbySlicePos (x, obj);
		y = moveYbySlicePos (y, obj);
	}
	if (document.layers) {
		if (menu) {
			var l = menu.menuLayer || menu;
			l.top = l.left = 1;
			hideActiveMenus();
			if (this.visibility) l = this;
			window.ActiveMenu = l;
		} else {
			var l = child;
		}
		if (!l) return;
		for (var i=0; i<l.layers.length; i++) { 			   
			if (!l.layers[i].isHilite) l.layers[i].visibility = "inherit";
			if (l.layers[i].document.layers.length > 0) MM_showMenu(null, "relative", "relative", l.layers[i]);
		}
		if (l.parentLayer) {
			if (x != "relative") l.parentLayer.left = x || window.pageX || 0;
			if (l.parentLayer.left + l.clip.width > window.innerWidth) l.parentLayer.left -= (l.parentLayer.left + l.clip.width - window.innerWidth);
			if (y != "relative") l.parentLayer.top = y || window.pageY || 0;
			if (l.parentLayer.isContainer) {
				l.Menu.xOffset = window.pageXOffset;
				l.Menu.yOffset = window.pageYOffset;
				l.parentLayer.clip.width = window.ActiveMenu.clip.width +2;
				l.parentLayer.clip.height = window.ActiveMenu.clip.height +2;
				if (l.parentLayer.menuContainerBgColor && l.Menu.menuBgOpaque ) l.parentLayer.document.bgColor = l.parentLayer.menuContainerBgColor;
			}
		}
		l.visibility = "inherit";
		if (l.Menu) l.Menu.container.visibility = "inherit";
	} else if (FIND("menuItem0")) {
		var l = menu.menuLayer || menu;	
		hideActiveMenus();
		if (typeof(l) == "string") l = FIND(l);
		window.ActiveMenu = l;
		var s = l.style;
		s.visibility = "inherit";
		if (x != "relative") {
			s.pixelLeft = x || (window.pageX + document.body.scrollLeft) || 0;
			s.left = s.pixelLeft + 'px';
		}
		if (y != "relative") {
			s.pixelTop = y || (window.pageY + document.body.scrollTop) || 0;
			s.top = s.pixelTop + 'px';
		}
		l.Menu.xOffset = document.body.scrollLeft;
		l.Menu.yOffset = document.body.scrollTop;
	}
	if (menu) window.activeMenus[window.activeMenus.length] = l;
	MM_clearTimeout();
}

function onMenuItemDown(e, l) {
	var a = window.ActiveMenuItem;
	if (document.layers && a) {
		a.eX = e.pageX;
		a.eY = e.pageY;
		a.clicked = true;
    }
}

function mouseupMenu(e) {
	hideMenu(true, e);
	hideActiveMenus();
	return true;
}

function getExplorerVersion() {
	var ieVers = parseFloat(navigator.appVersion);
	if( navigator.appName != 'Microsoft Internet Explorer' ) return ieVers;
	var tempVers = navigator.appVersion;
	var i = tempVers.indexOf( 'MSIE ' );
	if( i >= 0 ) {
		tempVers = tempVers.substring( i+5 );
		ieVers = parseFloat( tempVers ); 
	}
	return ieVers;
}

function mouseoutMenu() {
	if ((navigator.appName == "Microsoft Internet Explorer") && (getExplorerVersion() < 4.5))
		return true;
	hideMenu(false, false);
	return true;
}

function hideMenu(mouseup, e) {
	var a = window.ActiveMenuItem;
	if (a && document.layers) {
		a.document.bgColor = a.saveColor;
		a.focusItem.top = -30;
		if (a.hilite) a.hilite.visibility = "hidden";
		if (mouseup && a.mmaction && a.clicked && window.ActiveMenu) {
 			if (a.eX <= e.pageX+15 && a.eX >= e.pageX-15 && a.eY <= e.pageY+10 && a.eY >= e.pageY-10) {
				setTimeout('window.ActiveMenu.Menu.onMenuItemAction();', 500);
			}
		}
		a.clicked = false;
		if (a.Menu.bgImageOver) a.background.src = a.Menu.bgImageUp;
	} else if (window.ActiveMenu && FIND("menuItem0")) {
		if (a) {
			a.style.backgroundColor = a.saveColor;
			if (a.hilite) a.hilite.style.visibility = "hidden";
			if (a.hiliteShim) a.hiliteShim.style.visibility = "inherit";
			if (a.Menu.bgImageUp) a.style.background = "url(" + a.Menu.bgImageUp +")";
		}
	}
	if (!mouseup && window.ActiveMenu) {
		if (window.ActiveMenu.Menu) {
			if (window.ActiveMenu.Menu.hideOnMouseOut) MM_startTimeout();
			return(true);
		}
	}
	return(true);
}

function hideChildMenu(hcmLayer) {
	MM_clearTimeout();
	var l = hcmLayer;
	for (var i=0; i < l.Menu.childMenus.length; i++) {
		var theLayer = l.Menu.childMenus[i];
		if (document.layers) theLayer.visibility = "hidden";
		else {
			theLayer = FIND(theLayer);
			theLayer.style.visibility = "hidden";
			if( theLayer.Menu.menuItemHAlign != 'left' ) {
				for(var j = 0; j < theLayer.Menu.menuItemLayers.length; j++) {
					var itemLayer = theLayer.Menu.menuItemLayers[j];
					if(itemLayer.textShim) itemLayer.textShim.style.visibility = "inherit";
				}
			}
		}
		theLayer.Menu.hideChildMenu(theLayer);
	}
	if (l.childMenu) {
		var childMenu = l.childMenu;
		if (document.layers) {
			l.Menu.MM_showMenu(null,null,null,childMenu.layers[0]);
			childMenu.zIndex = l.parentLayer.zIndex +1;
			childMenu.top = l.Menu.menuLayer.top + l.Menu.submenuYOffset;
			if( l.Menu.vertical ) {
				if( l.Menu.submenuRelativeToItem ) childMenu.top += l.top + l.parentLayer.top;
				childMenu.left = l.parentLayer.left + l.parentLayer.clip.width - (2*l.Menu.menuBorder) + l.Menu.menuLayer.left + l.Menu.submenuXOffset;
			} else {
				childMenu.top += l.top + l.parentLayer.top;	
				if( l.Menu.submenuRelativeToItem ) childMenu.left = l.Menu.menuLayer.left + l.left + l.clip.width + (2*l.Menu.menuBorder) + l.Menu.submenuXOffset;
				else childMenu.left = l.parentLayer.left + l.parentLayer.clip.width - (2*l.Menu.menuBorder) + l.Menu.menuLayer.left + l.Menu.submenuXOffset;
			}
			if( childMenu.left < l.Menu.container.clip.left ) l.Menu.container.clip.left = childMenu.left;
			var w = childMenu.clip.width+childMenu.left-l.Menu.container.clip.left;
			if (w > l.Menu.container.clip.width)  l.Menu.container.clip.width = w;
			var h = childMenu.clip.height+childMenu.top-l.Menu.container.clip.top;
			if (h > l.Menu.container.clip.height) l.Menu.container.clip.height = h;
			l.document.layers[1].zIndex = 0;
			childMenu.visibility = "inherit";
		} else if (FIND("menuItem0")) {
			childMenu = FIND(l.childMenu);
			var menuLayer = FIND(l.Menu.menuLayer);
			var s = childMenu.style;
			s.zIndex = menuLayer.style.zIndex+1;
			if (document.all || window.mmIsOpera) {
				s.pixelTop = menuLayer.style.pixelTop + l.Menu.submenuYOffset;
				if( l.Menu.vertical ) {
					if( l.Menu.submenuRelativeToItem ) s.pixelTop += l.style.pixelTop;
					s.pixelLeft = l.style.pixelWidth + menuLayer.style.pixelLeft + l.Menu.submenuXOffset;
					s.left = s.pixelLeft + 'px';
				} else {
					s.pixelTop += l.style.pixelTop;
					if( l.Menu.submenuRelativeToItem ) s.pixelLeft = menuLayer.style.pixelLeft + l.style.pixelLeft + l.style.pixelWidth + (2*l.Menu.menuBorder) + l.Menu.submenuXOffset;
					else s.pixelLeft = (menuLayer.style.pixelWidth-4*l.Menu.menuBorder) + menuLayer.style.pixelLeft + l.Menu.submenuXOffset;
					s.left = s.pixelLeft + 'px';
				}
			} else {
				var top = parseInt(menuLayer.style.top) + l.Menu.submenuYOffset;
				var left = 0;
				if( l.Menu.vertical ) {
					if( l.Menu.submenuRelativeToItem ) top += parseInt(l.style.top);
					left = (parseInt(menuLayer.style.width)-4*l.Menu.menuBorder) + parseInt(menuLayer.style.left) + l.Menu.submenuXOffset;
				} else {
					top += parseInt(l.style.top);
					if( l.Menu.submenuRelativeToItem ) left = parseInt(menuLayer.style.left) + parseInt(l.style.left) + parseInt(l.style.width) + (2*l.Menu.menuBorder) + l.Menu.submenuXOffset;
					else left = (parseInt(menuLayer.style.width)-4*l.Menu.menuBorder) + parseInt(menuLayer.style.left) + l.Menu.submenuXOffset;
				}
				s.top = top + 'px';
				s.left = left + 'px';
			}
			childMenu.style.visibility = "inherit";
		} else return;
		window.activeMenus[window.activeMenus.length] = childMenu;
	}
}

function hideActiveMenus() {
	if (!window.activeMenus) return;
	for (var i=0; i < window.activeMenus.length; i++) {
		if (!activeMenus[i]) continue;
		if (activeMenus[i].visibility && activeMenus[i].Menu && !window.mmIsOpera) {
			activeMenus[i].visibility = "hidden";
			activeMenus[i].Menu.container.visibility = "hidden";
			activeMenus[i].Menu.container.clip.left = 0;
		} else if (activeMenus[i].style) {
			var s = activeMenus[i].style;
			s.visibility = "hidden";
			s.left = '-200px';
			s.top = '-200px';
		}
	}
	if (window.ActiveMenuItem) hideMenu(false, false);
	window.activeMenus.length = 0;
}

function moveXbySlicePos (x, img) { 
	if (!document.layers) {
		var onWindows = navigator.platform ? navigator.platform == "Win32" : false;
		var macIE45 = document.all && !onWindows && getExplorerVersion() == 4.5;
		var par = img;
		var lastOffset = 0;
		while(par){
			if( par.leftMargin && ! onWindows ) x += parseInt(par.leftMargin);
			if( (par.offsetLeft != lastOffset) && par.offsetLeft ) x += parseInt(par.offsetLeft);
			if( par.offsetLeft != 0 ) lastOffset = par.offsetLeft;
			par = macIE45 ? par.parentElement : par.offsetParent;
		}
	} else if (img.x) x += img.x;
	return x;
}

function moveYbySlicePos (y, img) {
	if(!document.layers) {
		var onWindows = navigator.platform ? navigator.platform == "Win32" : false;
		var macIE45 = document.all && !onWindows && getExplorerVersion() == 4.5;
		var par = img;
		var lastOffset = 0;
		while(par){
			if( par.topMargin && !onWindows ) y += parseInt(par.topMargin);
			if( (par.offsetTop != lastOffset) && par.offsetTop ) y += parseInt(par.offsetTop);
			if( par.offsetTop != 0 ) lastOffset = par.offsetTop;
			par = macIE45 ? par.parentElement : par.offsetParent;
		}		
	} else if (img.y >= 0) y += img.y;
	return y;
}