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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN">
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2 <html>
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3 <head>
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4 <meta content="text/html; charset=iso-8859-1"
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5 http-equiv="Content-Type">
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6 <meta content="IBM" name="Author">
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7 <meta content="Mozilla/4.75 [en] (Windows NT 5.0; U) [Netscape]"
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8 name="GENERATOR">
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9 <title>Linked Position Infrastructure</title>
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10 </head>
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11 <body>
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12 Application programming interfaces for interaction
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13 with the Eclipse text editor's linked position support.
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14 <h2>Linked Position Infrastructure</h2>
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15 <h3>package <code>org.eclipse.jface.text.link</code></h3>
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16 The Linked Position Infrastructure lets one set up a mode in an editor
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17 in which regions in a document (or several documents) are <em>linked</em>,
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18 i.e. editions
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19 of one linked position will be reflected in the others.
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20 <h4>Classes</h4>
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21 <ul>
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22 <li><code>LinkedPositionGroup</code>: a set of linked positions. Add
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23 positions to a group using the <code>addPosition</code> method. See <code>LinkedPosition</code> and <code>ProposalPosition</code>
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24 for a position type that lets one attach <code>ICompletionProposal</code>s to
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25 be shown when the position is hit.</li>
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26 <li><code>LinkedModeModel</code>: umbrellas several <code>LinkedPositionGroup</code>s,
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27 e.g. in a template that has several groups of linked positions. Handles
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28 the forwarding of updates received via an <code>IDocumentListener</code>. Add <code>LinkedPositionGroup</code>s
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29 to
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30 an model using the <code>addGroup</code> method. Existence of a <code>LinkedModeModel </code>can be
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31 tested by one of the static methods.<br>
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32 </li>
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33 <li><code>LinkedModeUI</code>: The UI for linked mode (for one
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34 model, to be precise). Monitors key etc. activity, monitors exit
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35 conditions, creates a painter etc. <br>
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36 Properties:
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37 <ul>
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38 <li><b>cycling mode</b> (whether to jump to the first position
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39 after the last): either of <code>CYCLE_ALWAYS</code>, <code>CYCLE_NEVER</code>
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40 and <code>CYCLE_WHEN_NO_PARENT</code> (default).</li>
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41 <li><b>exit position</b>: where to jump upon leaving the linked
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42 mode (e.g. using Enter, or Tab from the last position when not
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43 cycling). Set <code>isTabStop</code> to <code>true</code> if tabbing
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44 should stop over when cycling.</li>
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45 <li><span style="font-weight: bold;">position listener</span>:
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46 extending classes may register a position listener which will get
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47 notified whenever
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48 the focus position changes. An example is <code>org.eclipse.ui.texteditor.link.EditorLinkedModeUI.EditorHistoryUpdater</code>
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49 which will store the edit location in the editor navigation history.</li>
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50 </ul>
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51 </li>
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52
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53 </ul>
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54 <h4>Example</h4>
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55 <pre>
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56 IDocument doc1, doc2;
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57 ITextViewer viewer1, viewer2;
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58
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59 /* create groups - this step is independent of the linked mode */
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60 LinkedPositionGroup group1= new LinkedPositionGroup();
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61 group1.addPosition(new LinkedPosition(doc1, 3, 4));
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62 group1.addPosition(new LinkedPosition(doc1, 7, 8));
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63
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64 LinkedPositionGroup group2= new LinkedPositionGroup();
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65 group2.addPosition(new LinkedPosition(doc1, 15, 25));
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66 group2.addPosition(new LinkedPosition(doc2, 0, 10));
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67
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68 /* set up linked mode */
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69 LinkedModeModel model= new LinkedModeModel();
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70 model.addGroup(group1);
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71 model.addGroup(group2);
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72 model.forceInstall();
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73
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74 /* create UI */
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75 LinkedModeUI ui= new LinkedModeUI(model, new ITextViewer[] { viewer1, viewer2 });
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76 ui.enter();
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77 </pre>
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78 </body>
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79 </html>
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