bundles/org.simantics.document.ui/src/org/simantics/document/ui/CSSEditorTextHover.java

   1 package org.simantics.document.ui;
   2
   3 import org.eclipse.jface.text.AbstractReusableInformationControlCreator;
   4 import org.eclipse.jface.text.BadLocationException;
   5 import org.eclipse.jface.text.DefaultInformationControl;
   6 import org.eclipse.jface.text.IDocument;
   7 import org.eclipse.jface.text.IInformationControl;
   8 import org.eclipse.jface.text.IInformationControlCreator;
   9 import org.eclipse.jface.text.IRegion;
  10 import org.eclipse.jface.text.ITextHover;
  11 import org.eclipse.jface.text.ITextHoverExtension;
  12 import org.eclipse.jface.text.ITextHoverExtension2;
  13 import org.eclipse.jface.text.ITextViewer;
  14 import org.eclipse.jface.text.Region;
  15 import org.eclipse.jface.text.source.ISourceViewer;
  16 import org.eclipse.swt.widgets.Shell;
  17
  18 public class CSSEditorTextHover implements ITextHover, ITextHoverExtension, ITextHoverExtension2 {
  19
  20     private CSSTextEditorEnvironment sclTextEditorEnvironment;
  21
  22     public CSSEditorTextHover(ISourceViewer sourceViewer, CSSTextEditorEnvironment sclTextEditorEnvironment) {
  23         this.sclTextEditorEnvironment = sclTextEditorEnvironment;
  24     }
  25
  26     @Override
  27     public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
  28         return null;
  29     }
  30
  31     @Override
  32     public IRegion getHoverRegion(ITextViewer textViewer, int offset) {
  33         return findWord(textViewer.getDocument(), offset);
  34     }
  35
  36     private static IRegion findWord(IDocument document, int offset) {
  37         int start= -2;
  38         int end= -1;
  39
  40         try {
  41
  42             int pos= offset;
  43             char c;
  44
  45             while (pos >= 0) {
  46                 c= document.getChar(pos);
  47                 if (!Character.isUnicodeIdentifierPart(c))
  48                     break;
  49                 --pos;
  50             }
  51
  52             start= pos;
  53
  54             pos= offset;
  55             int length= document.getLength();
  56
  57             while (pos < length) {
  58                 c= document.getChar(pos);
  59                 if (!Character.isUnicodeIdentifierPart(c))
  60                     break;
  61                 ++pos;
  62             }
  63
  64             end= pos;
  65
  66         } catch (BadLocationException x) {
  67         }
  68
  69         if (start >= -1 && end > -1) {
  70             if (start == offset && end == offset)
  71                 return new Region(offset, 0);
  72             else if (start == offset)
  73                 return new Region(start, end - start);
  74             else
  75                 return new Region(start + 1, end - start - 1);
  76         }
  77
  78         return null;
  79     }
  80
  81     @Override
  82     public Object getHoverInfo2(ITextViewer textViewer, IRegion hoverRegion) {
  83         String info = null;
  84         try {
  85             IDocument document = textViewer.getDocument();
  86             String text = document.get(hoverRegion.getOffset(), hoverRegion.getLength());
  87             sclTextEditorEnvironment.updateEnvironment(document);
  88             info = sclTextEditorEnvironment.getHoverInfo(text);
  89         } catch (BadLocationException e) {
  90
  91         }
  92         return info;
  93     }
  94
  95     @Override
  96     public IInformationControlCreator getHoverControlCreator() {
  97         AbstractReusableInformationControlCreator creator = new AbstractReusableInformationControlCreator() {
  98
  99             @Override
 100             protected IInformationControl doCreateInformationControl(Shell parent) {
 101                 return new DefaultInformationControl(parent);
 102             }
 103         };
 104         return creator;
 105     }
 106
 107 }