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 org.vectomatic.dom.svg.*; 005 006 007/** A connecting path in the bridge/stage {@linkplain DIn tie overlay}. 008 */ 009abstract class Connector extends OMSVGPathElement 010{ 011 012 013 /** Creates a Connector. It is initially {@linkplain #isVisible() invisible}. 014 * 015 * @param linkID the 'id' attribute of the link. 016 */ 017 Connector( final String linkID ) 018 { 019 link = Document.get().getElementById( linkID ); 020 setVisible( false ); 021 final OMSVGPathSegList sL = getPathSegList(); 022 /*0*/sL.appendItem( createSVGPathSegMovetoAbs( 0,0 )); 023 /*1*/sL.appendItem( createSVGPathSegLinetoAbs( 0,0 )); 024 /*2*/sL.appendItem( createSVGPathSegLinetoAbs( 0,0 )); 025 } 026 027 028 029 // ------------------------------------------------------------------------------------ 030 031 032 /** Answers whether the path is long enough to bother drawing. 033 */ 034 final boolean isLongEnough( final int x0, final int midX, final int linkHeight ) 035 { 036 return midX - x0 > linkHeight / 2; 037 } 038 039 040 041 /** Answers whether this connector is nominally visible. Returns false if the display 042 * style is "none", true otherwise. 043 * 044 * @see #setVisible(boolean) 045 */ 046 final boolean isVisible() { return !"none".equals( getStyle().getDisplay() ); } 047 048 049 /** Sets the visibility of this connector. 050 * 051 * @see #isVisible() 052 */ 053 final void setVisible( final boolean toBe ) 054 { 055 if( toBe ) getStyle().clearDisplay(); 056 else getStyle().setDisplay( Style.Display.NONE ); 057 } 058 059 060 061 /** The link that is joined to the vote track by this connector. 062 */ 063 final Element link() { return link; } 064 065 066 private final Element link; 067 068 069 070 /** The vertical distance from the top of the link to where the connector is drawn. 071 * 072 * @param height the height of the link element. 073 */ 074 final int linkSink( final int height ) { return (int)( height * 0.65f ); } 075 076 077}