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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.jface.text.presentation.IPresentationReconciler;
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14
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15 import dwt.dwthelper.utils;
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16
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17
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18 import dwtx.jface.text.ITextViewer;
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19
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20
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21 /**
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22 * An <code>IPresentationReconciler</code> defines and maintains the
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23 * representation of a text viewer's document in the presence of changes applied
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24 * to the document. An <code>IPresentationReconciler</code> is a
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25 * <code>ITextViewer</code> add-on.
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26 * <p>
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27 * The presentation reconciler keeps track of changes applied to the text
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28 * viewer. It sends each change to presentation damagers which are registered
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29 * for the content types of the regions in which the change occurred. The
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30 * presentation reconciler passes the computed damage to presentation repairer
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31 * which construct text presentations. When applied to the presentation
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32 * reconciler's text viewer, those text presentations bring the document's
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33 * presentation in sync with the document's content and thus repair the damage.
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34 * A presentation damager is expected to return damage which is a valid input
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35 * for a presentation repairer registered for the same content type as the
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36 * damager.
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37 * </p>
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38 * <p>
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39 * A presentation reconciler should always be configured with a pair of
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40 * damager/repairer strategies. I.e. for each damager there should be a
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41 * corresponding repairer.
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42 * </p>
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43 * <p>
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44 * The interface may be implemented by clients. Clients may use
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45 * <code>PresentationReconciler</code> as the standard implementation of this
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46 * interface.
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47 * </p>
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48 * <p>
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49 * In order to provided backward compatibility for clients of
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50 * <code>IPresentationReconciler</code>, extension interfaces are used to
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51 * provide a means of evolution. The following extension interface exists:
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52 * <ul>
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53 * <li>
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54 * {@link dwtx.jface.text.presentation.IPresentationReconcilerExtension}
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55 * since version 3.0 adding support for documents with multiple partitionings.
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56 * </li>
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57 * </ul>
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58 * </p>
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59 *
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60 * @see dwtx.jface.text.presentation.IPresentationReconcilerExtension
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61 * @see dwtx.jface.text.ITextViewer
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62 * @see dwtx.jface.text.presentation.IPresentationDamager
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63 * @see dwtx.jface.text.presentation.IPresentationRepairer
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64 * @see dwtx.jface.text.TextPresentation
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65 */
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66 public interface IPresentationReconciler {
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67
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68 /**
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69 * Installs this presentation reconciler on the given text viewer. After
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70 * this method has been finished, the reconciler is operational. I.e., it
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71 * works without requesting further client actions until
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72 * <code>uninstall</code> is called.
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73 * <p>
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74 * The <code>install</code> and <code>uninstall</code> methods must be
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75 * called in sequence; i.e. repeatedly calling <code>install</code>
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76 * without calling <code>uninstall</code> may throw an exception.
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77 * </p>
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78 *
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79 * @param viewer the viewer on which this presentation reconciler is
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80 * installed
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81 */
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82 void install(ITextViewer viewer);
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83
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84 /**
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85 * Removes the reconciler from the text viewer it has previously been
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86 * installed on.
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87 */
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88 void uninstall();
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89
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90 /**
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91 * Returns the presentation damager registered with this presentation reconciler
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92 * for the specified content type.
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93 *
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94 * @param contentType the content type for which to determine the damager
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95 * @return the presentation damager registered for the given content type, or
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96 * <code>null</code> if there is no damager
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97 */
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98 IPresentationDamager getDamager(String contentType);
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99
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100 /**
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101 * Returns the presentation repairer registered with this presentation reconciler
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102 * for the specified content type.
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103 *
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104 * @param contentType the content type for which to determine the repairer
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105 * @return the presentation repairer registered for the given content type, or
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106 * <code>null</code> if there is no repairer
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107 */
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108 IPresentationRepairer getRepairer(String contentType);
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109 }
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