001package votorola.s.gwt.wic; // Copyright 2012, Michael Allan.  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Votorola Software"), to deal in the Votorola Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Votorola Software, and to permit persons to whom the Votorola Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Votorola Software. THE VOTOROLA SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE VOTOROLA SOFTWARE OR THE USE OR OTHER DEALINGS IN THE VOTOROLA SOFTWARE.
002
003import com.google.gwt.core.client.*;
004import com.google.gwt.dom.client.*;
005import votorola.g.web.gwt.*;
006import votorola.g.web.gwt.event.*;
007import votorola.s.gwt.stage.*;
008
009
010/** A controller that corrects links in the Wicket scene when the actor changes on stage.
011  * Currently it corrects position-like URLs in 'href' and 'onclick' attributes of the
012  * navigations tabs, which are expected to have an 'id' of 'navPile'.
013  */
014final class ActorLinker implements PropertyChangeHandler
015{
016
017
018    /** Creates the {@linkplain #i() single instance} of ActorLinker.
019      */
020    ActorLinker( final Stage stage ) // called by CountIn
021    {
022        navPile = Document.get().getElementById( "navPile" );
023        if( navPile == null ) assert false;
024        else
025        {
026            GWTX.i().bus().addHandlerToSource( PropertyChange.TYPE, /*source*/stage,
027              ActorLinker.this ); // no need to unregister, registry does not outlive this handler
028            relink( stage.getActorName() ); // init
029        }
030    }
031
032
033
034    /** The single instance of ActorLinker.
035      */
036    static ActorLinker i() { return instance; }
037
038
039        private static ActorLinker instance;
040
041        {
042            if( instance != null ) throw new IllegalStateException();
043
044            instance = ActorLinker.this;
045        }
046
047
048
049   // - P r o p e r t y - C h a n g e - H a n d l e r ------------------------------------
050
051
052    public void onPropertyChange( final PropertyChange e )
053    {
054        if( !e.propertyName().startsWith( "actorName" )) return;
055
056        relink( Stage.i().getActorName() );
057    }
058
059
060
061//// P r i v a t e ///////////////////////////////////////////////////////////////////////
062
063
064    private static final JavaScriptObject JS = newJS(); // constant JavaScript constructions
065
066
067        private static native JavaScriptObject newJS()
068        /*-{
069            var JS = {};
070            JS.LINK_PATTERN = new RegExp( "^(.*[A-Z][a-z]*\\?)(.*p=[^']+)(.*)$" );
071                                            // page name    ?  params     trailer
072                                            // in 'onclick', params end in single quote (')
073            JS.U_PARAMS_PATTERN = new RegExp( "^(.*)(&u=[^&]+)(.*)$" );
074                                          // leader  &u=value  trailer
075                                          // requires '&' first prepended
076            return JS;
077        }-*/;
078
079
080
081    private final Element navPile;
082
083
084
085    private native void relink( final String actorName ) // native to use _hvvww_dom.nextElement
086    /*-{
087        var dom = $wnd._hvvww_dom;
088        var JS = @votorola.s.gwt.wic.ActorLinker::JS;
089        var e = this.@votorola.s.gwt.wic.ActorLinker::navPile;
090        var eBound = dom.nextElement( e, null, false ); // shallow
091        for( ;; ) // each descendant of navPile
092        {
093            e = dom.nextElement( e, null, true ); // deep
094            if( e == eBound ) break;
095
096            var aName = 'href';
097            var aValue = e.getAttribute( aName );
098            if( !aValue )
099            {
100                aName = 'onclick';
101                aValue = e.getAttribute( aName );
102            }
103            if( !aValue ) continue;
104
105            var linkMatch = JS.LINK_PATTERN.exec( aValue );
106            if( !linkMatch ) continue;
107
108            var params = '&' + linkMatch[2]; // prepend '&' per U_PARAMS_PATTERN
109            var uMatch = JS.U_PARAMS_PATTERN.exec( params );
110            if( uMatch ) params = uMatch[1] + uMatch[3]; // without old u
111
112            if( actorName ) params += '&u=' + actorName; // add new u
113            params = params.slice( 1 ); // undo prepend of '&'
114            e.setAttribute( aName, linkMatch[1] + params + linkMatch[3] );
115        }
116    }-*/;
117
118
119}