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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11
  12 package net.sourceforge.phpdt.internal.ui.text.java.hover;
  13
  14 import net.sourceforge.phpdt.ui.text.java.hover.IJavaEditorTextHover;
  15
  16 import org.eclipse.jface.text.IRegion;
  17 import org.eclipse.jface.text.ITextViewer;
  18 import org.eclipse.ui.IEditorPart;
  19
  20 /**
  21  * Proxy for JavaEditorTextHovers.
  22  *
  23  * @since 2.1
  24  */
  25 public class JavaEditorTextHoverProxy extends AbstractJavaEditorTextHover {
  26
  27         private JavaEditorTextHoverDescriptor fHoverDescriptor;
  28
  29         private IJavaEditorTextHover fHover;
  30
  31         public JavaEditorTextHoverProxy(JavaEditorTextHoverDescriptor descriptor,
  32                         IEditorPart editor) {
  33                 fHoverDescriptor = descriptor;
  34                 setEditor(editor);
  35         }
  36
  37         /*
  38          * @see IJavaEditorTextHover#setEditor(IEditorPart)
  39          */
  40         public void setEditor(IEditorPart editor) {
  41                 super.setEditor(editor);
  42
  43                 if (fHover != null)
  44                         fHover.setEditor(getEditor());
  45         }
  46
  47         public boolean isEnabled() {
  48                 return true;
  49         }
  50
  51         /*
  52          * @see ITextHover#getHoverRegion(ITextViewer, int)
  53          */
  54         public IRegion getHoverRegion(ITextViewer textViewer, int offset) {
  55                 if (!isEnabled() || fHoverDescriptor == null)
  56                         return null;
  57
  58                 if (isCreated() || createHover())
  59                         return fHover.getHoverRegion(textViewer, offset);
  60                 else
  61                         return null;
  62         }
  63
  64         /*
  65          * @see ITextHover#getHoverInfo(ITextViewer, IRegion)
  66          */
  67         public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
  68                 if (!isEnabled() || fHoverDescriptor == null)
  69                         return null;
  70
  71                 if (isCreated() || createHover())
  72                         return fHover.getHoverInfo(textViewer, hoverRegion);
  73                 else
  74                         return null;
  75         }
  76
  77         private boolean isCreated() {
  78                 return fHover != null;
  79         }
  80
  81         private boolean createHover() {
  82                 fHover = fHoverDescriptor.createTextHover();
  83                 if (fHover != null)
  84                         fHover.setEditor(getEditor());
  85                 return isCreated();
  86         }
  87 }