bundles/org.simantics.scl.ui/src/org/simantics/scl/ui/assist/StyledTextContentAdapter.java

   1 /*******************************************************************************
   2  * Copyright (c) 2008 Mateusz Matela and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *     Mateusz Matela <mateusz.matela@gmail.com> -  Make StyledText work with ContentAssistCommandAdapter - https://bugs.eclipse.org/bugs/show_bug.cgi?id=246388
  10  *******************************************************************************/
  11 package org.simantics.scl.ui.assist;
  12
  13 import org.eclipse.jface.fieldassist.ContentProposalAdapter;
  14 import org.eclipse.jface.fieldassist.IControlContentAdapter;
  15 import org.eclipse.jface.fieldassist.IControlContentAdapter2;
  16 import org.eclipse.swt.custom.StyledText;
  17 import org.eclipse.swt.graphics.Point;
  18 import org.eclipse.swt.graphics.Rectangle;
  19 import org.eclipse.swt.widgets.Control;
  20
  21 /**
  22  * An {@link IControlContentAdapter} for {@link org.eclipse.swt.custom.StyledText}. This is
  23  * a convenience class for easily creating a {@link ContentProposalAdapter} for text fields.
  24  *
  25  * @since 3.5
  26  */
  27 public class StyledTextContentAdapter implements IControlContentAdapter, IControlContentAdapter2 {
  28         /*
  29          * (non-Javadoc)
  30          *
  31          * @see
  32          * org.eclipse.jface.fieldassist.IControlContentAdapter#getControlContents(org.eclipse
  33          * .swt.widgets.Control)
  34          */
  35         public String getControlContents(Control control) {
  36                 return ((StyledText)control).getText();
  37         }
  38
  39         /*
  40          * (non-Javadoc)
  41          *
  42          * @see
  43          * org.eclipse.jface.fieldassist.IControlContentAdapter#getCursorPosition(org.eclipse
  44          * .swt.widgets.Control)
  45          */
  46         public int getCursorPosition(Control control) {
  47                 return ((StyledText)control).getCaretOffset();
  48         }
  49
  50         /*
  51          * (non-Javadoc)
  52          *
  53          * @see
  54          * org.eclipse.jface.fieldassist.IControlContentAdapter#getInsertionBounds(org.eclipse
  55          * .swt.widgets.Control)
  56          */
  57         public Rectangle getInsertionBounds(Control control) {
  58                 StyledText text= (StyledText)control;
  59                 Point caretOrigin= text.getLocationAtOffset(text.getCaretOffset());
  60                 return new Rectangle(caretOrigin.x + text.getClientArea().x, caretOrigin.y + text.getClientArea().y + 3, 1, text.getLineHeight());
  61         }
  62
  63         /*
  64          * (non-Javadoc)
  65          *
  66          * @see
  67          * org.eclipse.jface.fieldassist.IControlContentAdapter#insertControlContents(org.eclipse
  68          * .swt.widgets.Control, java.lang.String, int)
  69          */
  70         public void insertControlContents(Control control, String contents, int cursorPosition) {
  71                 StyledText text = ((StyledText)control);
  72                 cursorPosition = Math.min(cursorPosition, contents.length());
  73
  74                 int caretOffset = text.getCaretOffset();
  75                 String currentText = text.getText();
  76                 int replacementOffset = findPrefixMatchOffset(currentText, caretOffset, contents);
  77
  78 //              System.out.println("text: " + currentText);
  79 //              System.out.println("proposal to fill: " + contents);
  80 //              System.out.format("longest match of proposed contents found from text @ offset %d: \"%s[%s]%s\"%n",
  81 //                              replacementOffset,
  82 //                              currentText.substring(0, replacementOffset),
  83 //                              currentText.substring(replacementOffset, caretOffset),
  84 //                              currentText.substring(caretOffset));
  85
  86                 // The text between [replaceOffset, caretOffset) will be replaced with `contents`
  87                 text.setSelection(replacementOffset, caretOffset);
  88                 text.insert(contents);
  89                 text.setSelection(replacementOffset + contents.length());
  90         }
  91
  92         /**
  93          * Find offset of longest prefix match of <code>match</code> in
  94          * <code>text</code> ending at offset <code>endOffset</code>.
  95          *
  96          * Example:
  97          * <pre>
  98          * ...  res (=text)
  99          * resource (=match)
 100          *  resourc
 101          *   resour
 102          *    resou
 103          *     reso
 104          *      res match! return endOffset - 3
 105          * </pre>
 106          *
 107          * @param text the text from which to find the match
 108          * @param endOffset endOffset until which to search for the longest match
 109          * @param match the text to prefix-match
 110          * @return
 111          */
 112         private static int findPrefixMatchOffset(String text, int endOffset, String match) {
 113                 for (int i = match.length(); i >= 0; --i) {
 114                         if (text.regionMatches(true, endOffset - i, match, 0, i))
 115                                 return endOffset - i;
 116                 }
 117                 return 0;
 118         }
 119
 120         /*
 121          * (non-Javadoc)
 122          *
 123          * @see
 124          * org.eclipse.jface.fieldassist.IControlContentAdapter#setControlContents(org.eclipse
 125          * .swt.widgets.Control, java.lang.String, int)
 126          */
 127         public void setControlContents(Control control, String contents, int cursorPosition) {
 128                 ((StyledText)control).setText(contents);
 129                 ((StyledText)control).setCaretOffset(cursorPosition);
 130         }
 131
 132         /*
 133          * (non-Javadoc)
 134          *
 135          * @see
 136          * org.eclipse.jface.fieldassist.IControlContentAdapter#setCursorPosition(org.eclipse
 137          * .swt.widgets.Control, int)
 138          */
 139         public void setCursorPosition(Control control, int index) {
 140                 ((StyledText)control).setCaretOffset(index);
 141         }
 142
 143         /*
 144          * (non-Javadoc)
 145          *
 146          * @see
 147          * org.eclipse.jface.fieldassist.IControlContentAdapter2#getSelection(org.eclipse.swt
 148          * .widgets.Control)
 149          */
 150         public Point getSelection(Control control) {
 151                 return ((StyledText)control).getSelection();
 152         }
 153
 154         /*
 155          * (non-Javadoc)
 156          *
 157          * @see
 158          * org.eclipse.jface.fieldassist.IControlContentAdapter2#setSelection(org.eclipse.swt
 159          * .widgets.Control, org.eclipse.swt.graphics.Point)
 160          */
 161         public void setSelection(Control control, Point range) {
 162                 ((StyledText)control).setSelection(range);
 163         }
 164
 165 }