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1   package ca.uhn.hl7v2.testpanel.ui.editor;
2   
3   import java.awt.Color;
4   import java.awt.Graphics;
5   import java.awt.Rectangle;
6   import java.awt.Shape;
7   
8   import javax.swing.text.BadLocationException;
9   import javax.swing.text.DefaultHighlighter;
10  import javax.swing.text.Highlighter;
11  import javax.swing.text.JTextComponent;
12  import javax.swing.text.LayeredHighlighter;
13  import javax.swing.text.Position;
14  import javax.swing.text.View;
15  
16  import org.slf4j.Logger;
17  import org.slf4j.LoggerFactory;
18  
19  public class UnderlineHighlighter extends DefaultHighlighter {
20  	protected static final Highlighter.HighlightPainter sharedPainter = new UnderlineHighlightPainter();
21  	
22  	private static final Logger ourLog = LoggerFactory.getLogger(UnderlineHighlighter.class);
23  	
24  	public UnderlineHighlighter() {
25  		setDrawsLayeredHighlights(true);
26  	}
27  
28  	/**
29       * {@inheritDoc}
30       */
31      @Override
32      public void paint(Graphics theG) {
33  		ourLog.debug("Repainting");
34  	    super.paint(theG);
35      }
36  
37  	/**
38       * {@inheritDoc}
39       */
40      @Override
41      public void paintLayeredHighlights(Graphics theG, int theP0, int theP1, Shape theViewBounds, JTextComponent theEditor, View theView) {
42  		ourLog.debug("Paintlayeredhighlights");
43  	    super.paintLayeredHighlights(theG, theP0, theP1, theViewBounds, theEditor, theView);
44      }
45  
46  	@Override
47  	public Object addHighlight(int theP0, int theP1, HighlightPainter theP) throws BadLocationException {
48  		ourLog.debug("Adding highlight");
49  		return addHighlight(theP0, theP1);
50  	}
51  
52  	public Object addHighlight(int p0, int p1) throws BadLocationException {
53  		return super.addHighlight(p0, p1, sharedPainter);
54  	}
55  
56  	public void setDrawsLayeredHighlights(boolean newValue) {
57  		if (newValue == false) {
58  			throw new IllegalArgumentException("UnderlineHighlighter only draws layered highlights");
59  		}
60  		super.setDrawsLayeredHighlights(true);
61  	}
62  
63  	// Painter for underlined highlights
64  	public static class UnderlineHighlightPainter extends LayeredHighlighter.LayerPainter {
65  		protected Color lineColour = new Color(0.2f, 0.6f, 0.2f);
66  		protected Color fillColour = new Color(0.75f, 1.0f, 0.75f);
67  
68  		public UnderlineHighlightPainter() {
69  		}
70  
71  		public void paint(Graphics g, int offs0, int offs1, Shape bounds, JTextComponent c) {
72  			System.out.println("Paint called");
73  		}
74  
75  		public Shape paintLayer(Graphics g, int offs0, int offs1, Shape bounds, JTextComponent c, View view) {
76  			
77  			ourLog.debug("Repainting");
78  			
79  			Rectangle alloc = null;
80  			if (offs0 == view.getStartOffset() && offs1 == view.getEndOffset()) {
81  				if (bounds instanceof Rectangle) {
82  					alloc = (Rectangle) bounds;
83  				} else {
84  					alloc = bounds.getBounds();
85  				}
86  			} else {
87  				try {
88  					Shape shape = view.modelToView(offs0, Position.Bias.Forward, offs1, Position.Bias.Backward, bounds);
89  					alloc = (shape instanceof Rectangle) ? (Rectangle) shape : shape.getBounds();
90  				} catch (BadLocationException e) {
91  					return null;
92  				}
93  			}
94  
95  //			FontMetrics fm = c.getFontMetrics(c.getFont());
96  //			int baseline = alloc.y + alloc.height - fm.getDescent() + 1;
97  			
98  //			g.drawLine(alloc.x, baseline, alloc.x + alloc.width, baseline);
99  //			g.drawLine(alloc.x, baseline + 1, alloc.x + alloc.width, baseline + 1);
100 
101 			g.setColor(fillColour);
102 			g.fillRect(alloc.x + 1, alloc.y + 1, alloc.width - 1, alloc.height - 1);
103 
104 			if (!c.hasFocus()) {
105 				int y = alloc.y + alloc.height - 2;
106 
107 				ourLog.debug("Repainting highlight at {}, {}", alloc.x, y);
108 				
109 				g.setColor(lineColour);
110 	//			g.drawRect(alloc.x, alloc.y, alloc.width, alloc.height - 2);
111 	//			g.drawRect(alloc.x, alloc.y, alloc.width - 1, alloc.height - 3);
112 				
113 				g.drawLine(alloc.x, y, alloc.x + alloc.width, y);
114 				y++;
115 				g.drawLine(alloc.x, y, alloc.x + alloc.width, y);
116 			}
117 			
118 			return alloc;
119 		}
120 	}
121 }