bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/widgets/WikiBrowser.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2012 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.browsing.ui.swt.widgets;\r
  13 \r
  14 import org.eclipse.mylyn.wikitext.core.parser.MarkupParser;\r
  15 import org.eclipse.swt.browser.Browser;\r
  16 import org.eclipse.swt.widgets.Composite;\r
  17 import org.eclipse.swt.widgets.Control;\r
  18 import org.eclipse.swt.widgets.Display;\r
  19 import org.simantics.Simantics;\r
  20 import org.simantics.browsing.ui.common.ErrorLogger;\r
  21 import org.simantics.browsing.ui.swt.widgets.impl.ReadFactory;\r
  22 import org.simantics.browsing.ui.swt.widgets.impl.WidgetSupport;\r
  23 import org.simantics.db.ReadGraph;\r
  24 import org.simantics.db.exception.DatabaseException;\r
  25 import org.simantics.db.layer0.variable.Variable;\r
  26 import org.simantics.db.management.ISessionContext;\r
  27 import org.simantics.db.procedure.Listener;\r
  28 import org.simantics.db.request.Read;\r
  29 import org.simantics.utils.datastructures.map.Tuple;\r
  30 import org.simantics.wiki.ui.SimanticsDialect;\r
  31 import org.simantics.wiki.ui.language.MediaWikiLanguage;\r
  32 \r
  33 public class WikiBrowser extends WidgetImpl {\r
  34 \r
  35     private ReadFactory<?, String>   textFactory;\r
  36     private ReadFactory<?, Variable> variableFactory;\r
  37 \r
  38     private String                   text;\r
  39     private Variable                 variable;\r
  40 \r
  41     private final Display            display;\r
  42     private final Browser   browser;\r
  43 \r
  44     private Tuple                    lastAppliedParametrization;\r
  45 \r
  46     public WikiBrowser(Composite parent, WidgetSupport support, int style) {\r
  47         super(support);\r
  48         display = parent.getDisplay();\r
  49         browser = new Browser(parent, style);\r
  50         support.register(this);\r
  51     }\r
  52 \r
  53     public void setTextFactory(ReadFactory<?, String> textFactory) {\r
  54         this.textFactory = textFactory;\r
  55     }\r
  56 \r
  57     public void setVariableFactory(ReadFactory<?, Variable> variableFactory) {\r
  58         this.variableFactory = variableFactory;\r
  59     }\r
  60 \r
  61     public Browser getWidget() {\r
  62         return browser;\r
  63     }\r
  64 \r
  65     @Override\r
  66     public Control getControl() {\r
  67         return browser;\r
  68     }\r
  69 \r
  70     private void update() {\r
  71         // Prevent synchronization problems since multiple threads and context\r
  72         // switches are involved in this process\r
  73         String text = this.text;\r
  74         Variable variable = this.variable;\r
  75         System.out.println("update(" + text + ", " + variable + ")");\r
  76         if (text == null || variable == null || browser.isDisposed())\r
  77             return;\r
  78 \r
  79         display.asyncExec(new Runnable() {\r
  80 \r
  81             @Override\r
  82             public void run() {\r
  83                 final String text = WikiBrowser.this.text;\r
  84                 final Variable variable = WikiBrowser.this.variable;\r
  85                 if (text == null || variable == null || browser.isDisposed()) {\r
  86                     return;\r
  87                 }\r
  88 \r
  89                 Tuple checkParam = new Tuple(text, variable);\r
  90                 if (checkParam.equals(lastAppliedParametrization))\r
  91                     return;\r
  92                 lastAppliedParametrization = checkParam;\r
  93 \r
  94                 try {\r
  95                     String markup = Simantics.getSession().syncRequest(new Read<String>() {\r
  96                         @Override\r
  97                         public String perform(ReadGraph graph) throws DatabaseException {\r
  98                             return SimanticsDialect.INSTANCE.apply(graph, variable, text);\r
  99                         }\r
 100                     });\r
 101 \r
 102                     MarkupParser markupParser = new MarkupParser();\r
 103                     MediaWikiLanguage language = new MediaWikiLanguage();\r
 104                     markupParser.setMarkupLanguage(language);\r
 105                     final String htmlContent = markupParser.parseToHtml(markup);\r
 106                     if (htmlContent == null)\r
 107                         return;\r
 108 \r
 109                     browser.setText(htmlContent);\r
 110 \r
 111                 } catch (DatabaseException e) {\r
 112                     ErrorLogger.defaultLogError(e);\r
 113                 }\r
 114             }\r
 115         });\r
 116     }\r
 117 \r
 118     @Override\r
 119     public void setInput(ISessionContext context, Object input) {\r
 120 \r
 121         if(textFactory != null) {\r
 122             textFactory.listen(context, input, new Listener<String>() {\r
 123 \r
 124                 @Override\r
 125                 public void exception(Throwable t) {\r
 126                     ErrorLogger.defaultLogError(t);\r
 127                 }\r
 128 \r
 129                 @Override\r
 130                 public void execute(final String text) {\r
 131                     WikiBrowser.this.text = text;\r
 132                     update();\r
 133                 }\r
 134 \r
 135                 @Override\r
 136                 public boolean isDisposed() {\r
 137                     return browser.isDisposed();\r
 138                 }\r
 139 \r
 140             });\r
 141         }\r
 142 \r
 143         if(variableFactory != null) {\r
 144             variableFactory.listen(context, input, new Listener<Variable>() {\r
 145 \r
 146                 @Override\r
 147                 public void exception(Throwable t) {\r
 148                     ErrorLogger.defaultLogError(t);\r
 149                 }\r
 150 \r
 151                 @Override\r
 152                 public void execute(final Variable variable) {\r
 153                     WikiBrowser.this.variable = variable;\r
 154                     update();\r
 155                 }\r
 156 \r
 157                 @Override\r
 158                 public boolean isDisposed() {\r
 159                     return browser.isDisposed();\r
 160                 }\r
 161 \r
 162             });\r
 163 \r
 164         }\r
 165 \r
 166     }\r
 167 \r
 168     public boolean isDisposed() {\r
 169         return browser.isDisposed();\r
 170     }\r
 171 \r
 172 }\r