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