net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/text/java/hover/JavaEditorTextHoverProxy.java

   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 /**
  22  * Proxy for JavaEditorTextHovers.
  23  *
  24  * @since 2.1
  25  */
  26 public class JavaEditorTextHoverProxy extends AbstractJavaEditorTextHover {
  27
  28         private JavaEditorTextHoverDescriptor fHoverDescriptor;
  29         private IJavaEditorTextHover fHover;
  30
  31         public JavaEditorTextHoverProxy(JavaEditorTextHoverDescriptor descriptor, IEditorPart editor) {
  32                 fHoverDescriptor= descriptor;
  33                 setEditor(editor);
  34         }
  35
  36         /*
  37          * @see IJavaEditorTextHover#setEditor(IEditorPart)
  38          */
  39         public void setEditor(IEditorPart editor) {
  40                 super.setEditor(editor);
  41
  42                 if (fHover != null)
  43                         fHover.setEditor(getEditor());
  44         }
  45
  46         public boolean isEnabled() {
  47                 return true;
  48         }
  49
  50         /*
  51          * @see ITextHover#getHoverRegion(ITextViewer, int)
  52          */
  53         public IRegion getHoverRegion(ITextViewer textViewer, int offset) {
  54                 if (!isEnabled() || fHoverDescriptor == null)
  55                         return null;
  56
  57                 if (isCreated() || createHover())
  58                         return fHover.getHoverRegion(textViewer, offset);
  59                 else
  60                         return null;
  61         }
  62
  63         /*
  64          * @see ITextHover#getHoverInfo(ITextViewer, IRegion)
  65          */
  66         public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
  67                 if (!isEnabled() || fHoverDescriptor == null)
  68                         return null;
  69
  70                 if (isCreated() || createHover())
  71                         return fHover.getHoverInfo(textViewer, hoverRegion);
  72                 else
  73                         return null;
  74         }
  75
  76         private boolean isCreated() {
  77                 return fHover != null;
  78         }
  79
  80         private boolean createHover() {
  81                 fHover= fHoverDescriptor.createTextHover();
  82                 if (fHover != null)
  83                         fHover.setEditor(getEditor());
  84                 return isCreated();
  85         }
  86 }