Lift Framework example source code file (Menu.scala)
The Lift Framework Menu.scala source code
/*
* Copyright 2007-2011 WorldWide Conferencing, LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.liftweb
package builtin
package snippet
import http.{S, DispatchSnippet, LiftRules}
import http.js._
import sitemap._
import util._
import common._
import scala.xml._
import JsCmds._
import JE._
import Helpers._
/**
* <p>This built-in snippet can be used to render a menu representing your SiteMap.
* There are three main snippet methods that you can use:</p>
*
* <ul>
* <li>builder - Renders the entire SiteMap, optionally expanding all child menus
* <li>group - Renders the MenuItems corresponding to the specified group.
* <li>item - Renders the specific named MenuItem
* </ul>
*
* <p>More detailed usage of each method is provided below
*/
object Menu extends DispatchSnippet {
def dispatch: DispatchIt = {
case "builder" => builder
case "title" => title
case "item" => item
case "group" => group
case "json" => jsonMenu
}
/**
* <p>This snippet method renders a menu representing your SiteMap contents. The
* menu is rendered as a set of nested unordered lists (<ul />). By
* default, it only renders nested child menus for menus that match the current request path.
* You can add the "expandAll" attribute to the snippet tag to force full expansion of
* all child menus. Additionally, you can use the following attribute prefixes to further customize
* the generated list and list item elements:</p>
*
* <ul>
* <li>top - Adds the specified attribute to the top-level <ul> element that makes up the menu
* <li>ul - Adds the specified attribute to each <ul> element (top-level and nested children) that makes up the menu
* <li>li - Adds the specified attribute to each <li> element for the menu
* <li>li_item - Adds the specified attribute to the current page’s menu item
* <li>outer_tag - the tag for the outer XML element (ul by default)
* <li>inner_tag - the tag for the inner XML element (li by default)
* <li>li_path - Adds the specified attribute to the current page’s breadcrumb path. The
* breadcrumb path is the set of menu items leading to this one.</li>
* <li>linkToSelf - False by default, but available as 'true' to generate link to the current page
* <li>level - Controls the level of menus that will be output. "0" is the top-level menu, "1" is children of
* the current menu item, and so on. Child menus will be expanded unless the "expand" attribute is set to <pre>false.
* <li>expand - Controls whether or not to expand child menus. Defaults to true. * </ul> * * <p>If you are using designer friendly invocation, you can access the namespaced attributes: * <div class="lift:Menu?li_item:class=foo+bar">menu</div> * </p> * * <p>For a simple, default menu, simply add * * <pre> * <lift:Menu.builder /> * </pre> * * <p>To your template. You can render the entire sitemap with * * <pre> * <lift:Menu.builder expandAll="true" /> * </pre> * * <p>Customizing the elements is handled through the prefixed attributes described above. * For instance, you could make the current page menu item red:</p> * * <pre> * <lift:Menu.builder li_item:style="color: red;" /> * </pre> */ def builder(info: NodeSeq): NodeSeq = { val outerTag: String = S.attr("outer_tag") openOr "ul" val innerTag: String = S.attr("inner_tag") openOr "li" val expandAll = (S.attr("expandAll") or S.attr("expandall")).isDefined val linkToSelf: Boolean = (S.attr("linkToSelf") or S.attr("linktoself")).map(Helpers.toBoolean) openOr false val expandAny: Boolean = S.attr("expand").map(Helpers.toBoolean) openOr true val level: Box[Int] = for (lvs <- S.attr("level"); i <- Helpers.asInt(lvs)) yield i val toRender: Seq[MenuItem] = (S.attr("item"), S.attr("group")) match { case (Full(item), _) => for{ sm <- LiftRules.siteMap.toList req <- S.request.toList loc <- sm.findLoc(item).toList item <- buildItemMenu(loc, req.location, expandAll) } yield item case (_, Full(group)) => for{ sm <- LiftRules.siteMap.toList loc <- sm.locForGroup(group) req <- S.request.toList item <- buildItemMenu(loc, req.location, expandAll) } yield item case _ => renderWhat(expandAll) } def ifExpandCurrent(f: => NodeSeq): NodeSeq = if (expandAny || expandAll) f else NodeSeq.Empty def ifExpandAll(f: => NodeSeq): NodeSeq = if (expandAll) f else NodeSeq.Empty toRender.toList match { case Nil if S.attr("group").isDefined => NodeSeq.Empty case Nil => Text("No Navigation Defined.") case xs => val liMap = S.prefixedAttrsToMap("li") val li = S.mapToAttrs(liMap) def buildANavItem(i: MenuItem) = { i match { // Per Loc.PlaceHolder, placeholder implies HideIfNoKids case m@MenuItem(text, uri, kids, _, _, _) if m.placeholder_? && kids.isEmpty => NodeSeq.Empty case m@MenuItem(text, uri, kids, _, _, _) if m.placeholder_? => Helpers.addCssClass(i.cssClass, Elem(null, innerTag, Null, TopScope, // Is a placeholder useful if we don't display the kids? I say no (DCB, 20101108) <xml:group> {text}{buildUlLine(kids)}) % (if (m.path) S.prefixedAttrsToMetaData("li_path", liMap) else Null) % (if (m.current) S.prefixedAttrsToMetaData("li_item", liMap) else Null)) case MenuItem(text, uri, kids, true, _, _) if linkToSelf => Helpers.addCssClass(i.cssClass, Elem(null, innerTag, Null, TopScope, <xml:group> {text}{ifExpandCurrent(buildUlLine(kids))}) % S.prefixedAttrsToMetaData("li_item", liMap)) case MenuItem(text, uri, kids, true, _, _) => Helpers.addCssClass(i.cssClass, Elem(null, innerTag, Null, TopScope, <xml:group> {text}{ifExpandCurrent(buildUlLine(kids))}) % S.prefixedAttrsToMetaData("li_item", liMap)) // Not current, but on the path, so we need to expand children to show the current one case MenuItem(text, uri, kids, _, true, _) => Helpers.addCssClass(i.cssClass, Elem(null, innerTag, Null, TopScope, <xml:group> {text}{buildUlLine(kids)}) % S.prefixedAttrsToMetaData("li_path", liMap)) case MenuItem(text, uri, kids, _, _, _) => Helpers.addCssClass(i.cssClass, Elem(null, innerTag, Null, TopScope, <xml:group> {text}{ifExpandAll(buildUlLine(kids))}) % li) } } def buildUlLine(in: Seq[MenuItem]): NodeSeq = if (in.isEmpty) { NodeSeq.Empty } else { if (outerTag.length > 0) { Elem(null, outerTag, Null, TopScope, <xml:group>{in.flatMap(buildANavItem)}) % S.prefixedAttrsToMetaData("ul") } else { in.flatMap(buildANavItem) } } val realMenuItems = level match { case Full(lvl) if lvl > 0 => def findKids(cur: Seq[MenuItem], depth: Int): Seq[MenuItem] = if (depth == 0) cur else findKids(cur.flatMap(mi => mi.kids), depth - 1) findKids(xs, lvl) case _ => xs } buildUlLine(realMenuItems) match { case top: Elem => top % S.prefixedAttrsToMetaData("top") case other => other } } } // This is used to build a MenuItem for a single Loc private def buildItemMenu [A] (loc : Loc[A], currLoc: Box[Loc[_]], expandAll : Boolean) : List[MenuItem] = { val kids : List[MenuItem] = if (expandAll) loc.buildKidMenuItems(loc.menu.kids) else Nil loc.buildItem(kids, currLoc == Full(loc), currLoc == Full(loc)).toList } private def renderWhat(expandAll: Boolean): Seq[MenuItem] = (if (expandAll) for {sm <- LiftRules.siteMap; req <- S.request} yield sm.buildMenu(req.location).lines else S.request.map(_.buildMenu.lines)) openOr Nil def jsonMenu(ignore: NodeSeq): NodeSeq = { val toRender = renderWhat(true) def buildItem(in: MenuItem): JsExp = in match { case MenuItem(text, uri, kids, current, path, _) => JsObj("text" -> text.toString, "uri" -> uri.toString, "children" -> buildItems(kids), "current" -> current, "cssClass" -> (in.cssClass openOr ""), "placeholder" -> in.placeholder_?, "path" -> path) } def buildItems(in: Seq[MenuItem]): JsExp = JsArray(in.map(buildItem) :_*) Script(JsCrVar(S.attr("var") openOr "lift_menu", JsObj("menu" -> buildItems(toRender)))) } /** * <p>Renders the title for the current request path (location). You can use this to * automatically set the title for your page based on your SiteMap:</p> * * <pre> * ... * <head> * <title><lift:Menu.title /></title> * </head> * ... * </pre> * <p>HTML5 does not support tags inside the <title> tag, * so you must do: * </p> * * <pre> * * <head> * <title class="lift:Menu.title"e;>The page named %*% is being displayed</title> * </head> * </pre> * <p> * And Lift will substitute the title at the %*% marker, alternative, Lift * will append the Menu.title to the contents of the <title> tag. * </p> */ def title(text: NodeSeq): NodeSeq = { val r = for (request <- S.request; loc <- request.location) yield loc.title text match { case TitleText(attrs, str) => { r.map { rt => { val rts = rt.text val idx = str.indexOf("%*%") val bodyStr = if (idx >= 0) { str.substring(0, idx) + rts + str.substring(idx + 3) } else { str +" "+rts } <title>{bodyStr} % attrs } } openOr text } case _ => { r openOr Text("") } } } private object TitleText { def unapply(in: NodeSeq): Option[(MetaData, String)] = if (in.length == 1 && in(0).isInstanceOf[Elem]) { val e = in(0).asInstanceOf[Elem] if (e.prefix == null && e.label == "title") { if (e.child.length == 0) { Some(e.attributes -> "") } else if (e.child.length == 1 && e.child(0).isInstanceOf[Atom[_]]) { Some(e.attributes -> e.child.text) } else None } else None } else None } /** * <p>Renders a group of menu items. You specify a group using the LocGroup LocItem * case class on your Menu Loc:</p> * * <pre> * val menus = * Menu(Loc("a",...,...,LocGroup("test"))) :: * Menu(Loc("b",...,...,LocGroup("test"))) :: * Menu(Loc("c",...,...,LocGroup("test"))) :: Nil * </pre> * * <p>You can then render with the group snippet: * * <pre> * <lift:Menu.group group="test" /> * </pre> * * <p>Each menu item is rendered as an anchor tag (<a />), and you can customize * the tag using attributes prefixed with "a":</p> * * <pre> * <lift:Menu.group group="test" a:class="menulink" /> * </pre> * * <p>You can also specify your own template within the Menu.group snippet tag, as long as * you provide a <menu:bind /> element where the snippet can place each menu item:</p> * * <pre> * <ul> * <lift:Menu.group group="test" > * <li><menu:bind /></li> * </lift:Menu.group> * </pre> * */ def group(template: NodeSeq): NodeSeq = { val toBind = if ((template \ "bind").filter(_.prefix == "menu").isEmpty) <xml:group> Other Lift Framework examples (source code examples)Here is a short list of links related to this Lift Framework Menu.scala source code file: |
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