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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 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.template.contentassist;
  13
  14
  15 import org.eclipse.swt.graphics.Image;
  16 import org.eclipse.swt.graphics.Point;
  17
  18 import org.eclipse.jface.text.Assert;
  19 import org.eclipse.jface.text.BadLocationException;
  20 import org.eclipse.jface.text.DocumentEvent;
  21 import org.eclipse.jface.text.IDocument;
  22 import org.eclipse.jface.text.ITextViewer;
  23 import org.eclipse.jface.text.Position;
  24 import org.eclipse.jface.text.contentassist.ICompletionProposal;
  25 import org.eclipse.jface.text.contentassist.ICompletionProposalExtension;
  26 import org.eclipse.jface.text.contentassist.ICompletionProposalExtension2;
  27 import org.eclipse.jface.text.contentassist.IContextInformation;
  28
  29
  30 /**
  31  * An enhanced implementation of the <code>ICompletionProposal</code> interface implementing all the extension interfaces.
  32  * It uses a position to track its replacement offset and length. The position must be set up externally.
  33  */
  34 public class PositionBasedCompletionProposal implements ICompletionProposal, ICompletionProposalExtension, ICompletionProposalExtension2 {
  35
  36         /** The string to be displayed in the completion proposal popup */
  37         private String fDisplayString;
  38         /** The replacement string */
  39         private String fReplacementString;
  40         /** The replacement position. */
  41         private Position fReplacementPosition;
  42         /** The cursor position after this proposal has been applied */
  43         private int fCursorPosition;
  44         /** The image to be displayed in the completion proposal popup */
  45         private Image fImage;
  46         /** The context information of this proposal */
  47         private IContextInformation fContextInformation;
  48         /** The additional info of this proposal */
  49         private String fAdditionalProposalInfo;
  50
  51         /**
  52          * Creates a new completion proposal based on the provided information.  The replacement string is
  53          * considered being the display string too. All remaining fields are set to <code>null</code>.
  54          *
  55          * @param replacementString the actual string to be inserted into the document
  56          * @param replacementPosition the position of the text to be replaced
  57          * @param cursorPosition the position of the cursor following the insert relative to replacementOffset
  58          */
  59         public PositionBasedCompletionProposal(String replacementString, Position replacementPosition, int cursorPosition) {
  60                 this(replacementString, replacementPosition, cursorPosition, null, null, null, null);
  61         }
  62
  63         /**
  64          * Creates a new completion proposal. All fields are initialized based on the provided information.
  65          *
  66          * @param replacementString the actual string to be inserted into the document
  67          * @param replacementPosition the position of the text to be replaced
  68          * @param cursorPosition the position of the cursor following the insert relative to replacementOffset
  69          * @param image the image to display for this proposal
  70          * @param displayString the string to be displayed for the proposal
  71          * @param contextInformation the context information associated with this proposal
  72          * @param additionalProposalInfo the additional information associated with this proposal
  73          */
  74         public PositionBasedCompletionProposal(String replacementString, Position replacementPosition, int cursorPosition, Image image, String displayString, IContextInformation contextInformation, String additionalProposalInfo) {
  75                 Assert.isNotNull(replacementString);
  76                 Assert.isTrue(replacementPosition != null);
  77
  78                 fReplacementString= replacementString;
  79                 fReplacementPosition= replacementPosition;
  80                 fCursorPosition= cursorPosition;
  81                 fImage= image;
  82                 fDisplayString= displayString;
  83                 fContextInformation= contextInformation;
  84                 fAdditionalProposalInfo= additionalProposalInfo;
  85         }
  86
  87         /*
  88          * @see ICompletionProposal#apply(IDocument)
  89          */
  90         public void apply(IDocument document) {
  91                 try {
  92                         document.replace(fReplacementPosition.getOffset(), fReplacementPosition.getLength(), fReplacementString);
  93                 } catch (BadLocationException x) {
  94                         // ignore
  95                 }
  96         }
  97
  98         /*
  99          * @see ICompletionProposal#getSelection(IDocument)
 100          */
 101         public Point getSelection(IDocument document) {
 102                 return new Point(fReplacementPosition.getOffset() + fCursorPosition, 0);
 103         }
 104
 105         /*
 106          * @see ICompletionProposal#getContextInformation()
 107          */
 108         public IContextInformation getContextInformation() {
 109                 return fContextInformation;
 110         }
 111
 112         /*
 113          * @see ICompletionProposal#getImage()
 114          */
 115         public Image getImage() {
 116                 return fImage;
 117         }
 118
 119         /*
 120          * @see org.eclipse.jface.text.contentassist.ICompletionProposal#getDisplayString()
 121          */
 122         public String getDisplayString() {
 123                 if (fDisplayString != null)
 124                         return fDisplayString;
 125                 return fReplacementString;
 126         }
 127
 128         /*
 129          * @see ICompletionProposal#getAdditionalProposalInfo()
 130          */
 131         public String getAdditionalProposalInfo() {
 132                 return fAdditionalProposalInfo;
 133         }
 134
 135         /*
 136          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#apply(org.eclipse.jface.text.ITextViewer, char, int, int)
 137          */
 138         public void apply(ITextViewer viewer, char trigger, int stateMask, int offset) {
 139                 apply(viewer.getDocument());
 140         }
 141
 142         /*
 143          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#selected(org.eclipse.jface.text.ITextViewer, boolean)
 144          */
 145         public void selected(ITextViewer viewer, boolean smartToggle) {
 146         }
 147
 148         /*
 149          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#unselected(org.eclipse.jface.text.ITextViewer)
 150          */
 151         public void unselected(ITextViewer viewer) {
 152         }
 153
 154         /*
 155          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#validate(org.eclipse.jface.text.IDocument, int, org.eclipse.jface.text.DocumentEvent)
 156          */
 157         public boolean validate(IDocument document, int offset, DocumentEvent event) {
 158                 try {
 159                         String content= document.get(fReplacementPosition.getOffset(), fReplacementPosition.getLength());
 160                         if (content.startsWith(fReplacementString))
 161                                 return true;
 162                 } catch (BadLocationException e) {
 163                         // ignore concurrently modified document
 164                 }
 165                 return false;
 166         }
 167
 168         /*
 169          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension#apply(org.eclipse.jface.text.IDocument, char, int)
 170          */
 171         public void apply(IDocument document, char trigger, int offset) {
 172                 // not called any more
 173         }
 174
 175         /*
 176          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension#isValidFor(org.eclipse.jface.text.IDocument, int)
 177          */
 178         public boolean isValidFor(IDocument document, int offset) {
 179                 // not called any more
 180                 return false;
 181         }
 182
 183         /*
 184          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension#getTriggerCharacters()
 185          */
 186         public char[] getTriggerCharacters() {
 187                 return null;
 188         }
 189
 190         /*
 191          * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension#getContextInformationPosition()
 192          */
 193         public int getContextInformationPosition() {
 194                 return fReplacementPosition.getOffset();
 195         }
 196
 197 }
 198