bundles/org.simantics.ui/src/org/simantics/ui/contribution/OpenWithMenuContribution.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.ui.contribution;
  13
  14 import java.util.Arrays;
  15 import java.util.Comparator;
  16
  17 import org.eclipse.jface.action.ContributionItem;
  18 import org.eclipse.jface.action.IContributionItem;
  19 import org.eclipse.jface.resource.ImageDescriptor;
  20 import org.eclipse.jface.resource.JFaceResources;
  21 import org.eclipse.jface.resource.LocalResourceManager;
  22 import org.eclipse.jface.resource.ResourceManager;
  23 import org.eclipse.swt.SWT;
  24 import org.eclipse.swt.events.SelectionEvent;
  25 import org.eclipse.swt.events.SelectionListener;
  26 import org.eclipse.swt.widgets.Menu;
  27 import org.eclipse.swt.widgets.MenuItem;
  28 import org.simantics.db.ReadGraph;
  29 import org.simantics.db.Resource;
  30 import org.simantics.db.exception.DatabaseException;
  31 import org.simantics.ui.selection.WorkbenchSelectionUtils;
  32 import org.simantics.ui.workbench.action.ResourceEditorAdapterAction;
  33 import org.simantics.ui.workbench.editor.EditorAdapter;
  34 import org.simantics.ui.workbench.editor.EditorRegistry;
  35 import org.simantics.utils.strings.AlphanumComparator;
  36
  37
  38 /**
  39  * @author Tuukka Lehtonen
  40  */
  41 public class OpenWithMenuContribution extends DynamicMenuContribution {
  42
  43     private static final boolean DEBUG_ADAPTERS = false;
  44
  45     private ResourceManager resourceManager;
  46
  47     public OpenWithMenuContribution() {
  48         resourceManager = new LocalResourceManager(JFaceResources.getResources());
  49     }
  50
  51     @Override
  52     public void dispose() {
  53         if (resourceManager != null) {
  54             resourceManager.dispose();
  55             resourceManager = null;
  56         }
  57         super.dispose();
  58     }
  59
  60     protected Object extractResource(ReadGraph graph, Object object) throws DatabaseException {
  61         Resource resource = WorkbenchSelectionUtils.getPossibleResourceFromSelection(graph, object);
  62         return resource != null ? resource : object;
  63     }
  64
  65     @Override
  66     protected boolean preAcceptSelection(Object[] selection) {
  67         return selection.length == 1;
  68     }
  69
  70     protected String getText() {
  71         return "Open With";
  72     }
  73
  74     @Override
  75     protected IContributionItem[] getContributionItems(ReadGraph graph, Object[] selection) throws DatabaseException {
  76         final Object r = extractResource(graph, selection[0]);
  77         if (r == null)
  78             return NONE;
  79         final EditorAdapter[] editorAdapters = EditorRegistry.getInstance().getAdaptersFor(graph, r);
  80         if (editorAdapters.length == 0)
  81             return NONE;
  82
  83         return new IContributionItem[] {
  84                 new ContributionItem() {
  85                     @Override
  86                     public void fill(Menu menu, int index) {
  87                         MenuItem openWith = new MenuItem(menu, SWT.CASCADE, index);
  88                         openWith.setText(getText());
  89                         openWith.setEnabled(editorAdapters.length > 0);
  90                         Menu subMenu = new Menu(menu);
  91                         openWith.setMenu(subMenu);
  92
  93                         if (editorAdapters.length > 0) {
  94                             // Sort the open with actions in descending priority order.
  95                             Adapter[] adapters = new Adapter[editorAdapters.length];
  96                             for (int i = 0; i < editorAdapters.length; i++)
  97                                 adapters[i] = new Adapter(editorAdapters[i], r, true);
  98                             Arrays.sort(adapters, new Comparator<Adapter>() {
  99                                 @Override
 100                                 public int compare(Adapter o1, Adapter o2) {
 101                                     int delta = o2.getPriority() - o1.getPriority();
 102                                     if (delta != 0)
 103                                         return delta;
 104                                     return AlphanumComparator.CASE_INSENSITIVE_COMPARATOR.compare(o1.getText(), o2.getText());
 105                                 }
 106                             });
 107
 108                             for (Adapter a : adapters)
 109                                 addMenuItem(subMenu, a, r);
 110                         }
 111                     }
 112                 }
 113         };
 114     }
 115
 116     private void addMenuItem(Menu subMenu, Adapter adapter, Object r) {
 117         MenuItem item = new MenuItem(subMenu, SWT.PUSH);
 118         String text = adapter.getText();
 119         if (DEBUG_ADAPTERS) {
 120             text = text + " (" + adapter.getAdapter().getClass().getCanonicalName() + ") [" + adapter.getPriority() + "]";
 121         }
 122         item.setText(text);
 123         ImageDescriptor descriptor = adapter.getImageDescriptor();
 124         if (descriptor != null) {
 125             item.setImage(resourceManager.createImage(descriptor));
 126         }
 127         item.addSelectionListener(adapter);
 128     }
 129
 130     static class Adapter extends ResourceEditorAdapterAction implements SelectionListener {
 131         boolean remember;
 132
 133         public Adapter(EditorAdapter adapter, Object r, boolean remember) {
 134             super(adapter, r);
 135             this.remember = remember;
 136         }
 137
 138         @Override
 139         public void widgetDefaultSelected(SelectionEvent e) {
 140             widgetSelected(e);
 141         }
 142
 143         @Override
 144         public void widgetSelected(SelectionEvent e) {
 145             run();
 146         }
 147
 148         @Override
 149         protected void safeRun() throws Exception {
 150             super.safeRun();
 151
 152             if (remember) {
 153                 // Make this choice the default for the next time.
 154                 EditorRegistry.getInstance().getMappings().put(getResource(), getAdapter());
 155             }
 156         }
 157     }
 158
 159 }