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.dom.client.*; 004import com.google.web.bindery.event.shared.HandlerRegistration; 005import org.vectomatic.dom.svg.*; 006import votorola.a.count.gwt.*; 007import votorola.g.web.gwt.*; 008import votorola.g.web.gwt.event.*; 009import votorola.s.gwt.stage.*; 010import votorola.s.gwt.stage.vote.*; 011 012 013/** A component of the bridge/stage {@linkplain DIn tie overlay} that visually ties the 014 * other (non-anchor) drafter's link (tLink) at top left of the bridge scene to the 015 * corresponding position in the vote track. It comprises an {@linkplain AlterLine alter 016 * line} and {@linkplain AlterBracket alter bracket}.<pre> 017 * 018 * >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> vote track 019 * | | 020 * +----------------+ alter 021 * alter line | bracket 022 * tLink +-----------------------------+</pre> 023 */ 024final class AlterTie extends OMSVGGElement 025{ 026 027 028 /** Creates an AlterTie. Create at most one for the entire life of the document 029 * as currently it does not unregister its listeners or otherwise clean up after 030 * itself. 031 */ 032 AlterTie( final NodeV.Box nodeBox, VoteTrack _track ) 033 { 034 track = _track; 035 setVisible( false ); 036 new Initializer( nodeBox ); 037 } 038 039 040 041 private static AlterTie instance; 042 043 { 044 if( instance != null ) throw new IllegalStateException(); 045 046 instance = AlterTie.this; 047 } 048 049 050 051 // ------------------------------------------------------------------------------------ 052 053 054 /** Answers whether this tie is nominally visible. Returns false if the display style 055 * is "none", true otherwise. 056 * 057 * @see #setVisible(boolean) 058 */ 059 final boolean isVisible() { return !"none".equals( getStyle().getDisplay() ); } 060 061 062 /** Sets the visibility of this tie. 063 * 064 * @see #isVisible() 065 */ 066 private final void setVisible( final boolean toBe ) 067 { 068 if( toBe ) 069 { 070 if( !isVisible() ) 071 { 072 getStyle().clearDisplay(); 073 getFirstChild().repaint(); 074 } 075 } 076 else getStyle().setDisplay( Style.Display.NONE ); 077 } 078 079 080 081 // - O M - N o d e ------------------------------------------------------------------- 082 083 084 public @Override AlterBracket getFirstChild() { return (AlterBracket)super.getFirstChild(); } 085 086 087 088//// P r i v a t e /////////////////////////////////////////////////////////////////////// 089 090 091 private final VoteTrack track; 092 093 094 095 // ==================================================================================== 096 097 098 private final class Initializer implements ChangeHandler 099 { 100 101 Initializer( NodeV.Box _nodeBox ) 102 { 103 nodeBox = _nodeBox; 104 name = DifferenceLight.sceneName(); 105 if( name == null ) throw new IllegalStateException(); 106 107 if( nodeBox.isVisible() ) init(); 108 else // wait for it to repaint, then both visible and ready for AlterBracket.Painter 109 { 110 hR = GWTX.i().bus().addHandlerToSource( Change.TYPE, /*source*/nodeBox.painter(), 111 Initializer.this ); 112 } 113 } 114 115 116 private HandlerRegistration hR; // set if registered, cleared after unregistered 117 118 119 private final String name; 120 121 122 public final void onChange( Change _e ) 123 { 124 if( hR == null ) return; 125 126 hR.removeHandler(); 127 hR = null; 128 init(); 129 } 130 131 132 private final NodeV.Box nodeBox; 133 134 135 private void init() 136 { 137 for( final NodeV v: nodeBox.nodeViews() ) 138 { 139 final CountNodeJS node = v.getCountNode(); 140 if( node != null && node.name().equals(name) ) 141 { 142 final AlterLine alterLine = new AlterLine(); 143 appendChild( new AlterBracket( nodeBox, v, alterLine )); 144 // the requiste initial repaint is called in setVisible, via Visibilizer below 145 appendChild( alterLine ); 146 new Visibilizer(); 147 break; 148 } 149 } 150 } 151 152 } 153 154 155 156 // ==================================================================================== 157 158 159 private final class Visibilizer implements ChangeHandler 160 { 161 162 Visibilizer() 163 { 164 GWTX.i().bus().addHandlerToSource( Change.TYPE, /*source*/track, Visibilizer.this ); 165 // no need to unregister, registry does not outlive this listener 166 refresh(); 167 } 168 169 170 public final void onChange( Change _e ) { refresh(); } 171 172 173 private void refresh() 174 { 175 final CountJS count = track.count(); 176 setVisible( count != null && count.pollName().equals( Stage.i().getDefaultPollName() )); 177 // invisible for other polls, as nodeBox and nodeV are currently fixed 178 } 179 180 } 181 182 183}