bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/ComparatorSelector.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.browsing.ui.swt;
  13
  14 import java.util.Collection;
  15
  16 import org.eclipse.jface.layout.GridDataFactory;
  17 import org.eclipse.jface.viewers.IPostSelectionProvider;
  18 import org.eclipse.jface.viewers.ISelection;
  19 import org.eclipse.jface.viewers.ISelectionChangedListener;
  20 import org.eclipse.jface.viewers.SelectionChangedEvent;
  21 import org.eclipse.swt.SWT;
  22 import org.eclipse.swt.events.SelectionEvent;
  23 import org.eclipse.swt.events.SelectionListener;
  24 import org.eclipse.swt.graphics.Font;
  25 import org.eclipse.swt.graphics.FontData;
  26 import org.eclipse.swt.widgets.Combo;
  27 import org.eclipse.swt.widgets.Composite;
  28 import org.simantics.browsing.ui.BuiltinKeys;
  29 import org.simantics.browsing.ui.GraphExplorer;
  30 import org.simantics.browsing.ui.NodeContext;
  31 import org.simantics.browsing.ui.common.processors.UserSelectedComparableFactoryQueryProcessor;
  32 import org.simantics.browsing.ui.content.ComparableContextFactory;
  33 import org.simantics.db.layer0.SelectionHints;
  34 import org.simantics.utils.datastructures.Pair;
  35 import org.simantics.utils.ui.ISelectionUtils;
  36 import org.simantics.utils.ui.LayoutUtils;
  37
  38 /**
  39  * TODO: support multiselection within the IGraphExplorer
  40  */
  41 public class ComparatorSelector extends Composite {
  42
  43     Font smallFont;
  44
  45     public ComparatorSelector(final GraphExplorer explorer, final UserSelectedComparableFactoryQueryProcessor queryProcessor, Composite parent, int style) {
  46
  47         super(parent, style);
  48
  49         setLayoutData(GridDataFactory.fillDefaults().grab(true, false).create());
  50
  51         setLayout(LayoutUtils.createNoBorderGridLayout(1, false));
  52
  53         final Combo combo = new Combo(this, SWT.READ_ONLY);
  54
  55         Font initialFont = combo.getFont();
  56         FontData[] fontData = initialFont.getFontData();
  57         for (int i = 0; i < fontData.length; i++) {
  58             fontData[i].setHeight(fontData[i].getHeight() - 1);
  59         }
  60         smallFont = new Font(getDisplay(), fontData);
  61         combo.setFont(smallFont);
  62
  63         combo.setLayoutData(GridDataFactory.fillDefaults().grab(true, false).create());
  64         combo.add("-- No comparators --");
  65         combo.select(0);
  66
  67         combo.addSelectionListener(new SelectionListener() {
  68
  69             @Override
  70             public void widgetDefaultSelected(SelectionEvent e) {
  71                 widgetSelected(e);
  72             }
  73
  74             @SuppressWarnings("unchecked")
  75             @Override
  76             public void widgetSelected(SelectionEvent e) {
  77
  78                 int index = combo.getSelectionIndex();
  79
  80                 Pair<ComparableContextFactory, NodeContext> pair =
  81                     (Pair<ComparableContextFactory, NodeContext>)combo.getData(String.valueOf(index));
  82                 if (pair == null)
  83                     return;
  84
  85                 queryProcessor.select(pair.second, pair.first);
  86
  87             }
  88
  89         });
  90
  91         IPostSelectionProvider selectionProvider = (IPostSelectionProvider)explorer.getAdapter(IPostSelectionProvider.class);
  92
  93         selectionProvider.addSelectionChangedListener(new ISelectionChangedListener() {
  94
  95             @Override
  96             public void selectionChanged(SelectionChangedEvent event) {
  97
  98                 ISelection selection = event.getSelection();
  99
 100                 NodeContext context = ISelectionUtils.getSinglePossibleKey(selection, SelectionHints.KEY_MAIN, NodeContext.class);
 101
 102                 if(context == null) {
 103                     context = explorer.getRoot();
 104                 }
 105
 106                 assert(context != null);
 107
 108                 Collection<ComparableContextFactory> factories = explorer.query(context, BuiltinKeys.COMPARABLE_FACTORIES);
 109                 if(factories == null) {
 110                     combo.removeAll();
 111                     combo.add("-- No comparators --");
 112                     combo.select(0);
 113                     return;
 114                 }
 115
 116                 ComparableContextFactory oldSelection = queryProcessor.getComparator(context);
 117
 118                 combo.removeAll();
 119                 if(factories != null) {
 120                     for(ComparableContextFactory f : factories) {
 121                         int index = combo.getItemCount();
 122                         combo.add(f.toString());
 123                         combo.setData(String.valueOf(index), new Pair<ComparableContextFactory, NodeContext>(f, context));
 124                         if(f == oldSelection) {
 125                             combo.select(index);
 126                         }
 127                     }
 128                 }
 129                 if(combo.getItemCount() == 0) {
 130                     combo.add("-- No comparators --");
 131                 }
 132                 if(combo.getSelectionIndex() == -1) {
 133                     combo.select(0);
 134                 }
 135
 136             }
 137
 138         });
 139
 140     }
 141
 142     @Override
 143     public void dispose() {
 144         if (isDisposed())
 145             return;
 146         smallFont.dispose();
 147         super.dispose();
 148     }
 149
 150 }