1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.diagram.ui;
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14 import java.util.ArrayList;
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15 import java.util.Collections;
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16 import java.util.Optional;
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17 import java.util.concurrent.CopyOnWriteArrayList;
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18 import java.util.concurrent.TimeUnit;
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20 import org.eclipse.jface.viewers.IPostSelectionProvider;
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21 import org.eclipse.jface.viewers.ISelection;
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22 import org.eclipse.jface.viewers.ISelectionChangedListener;
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23 import org.eclipse.jface.viewers.SelectionChangedEvent;
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24 import org.eclipse.jface.viewers.StructuredSelection;
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25 import org.eclipse.ui.IWorkbenchPartSite;
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26 import org.simantics.Logger;
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27 import org.simantics.db.exception.DatabaseException;
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28 import org.simantics.diagram.elements.AdaptableImmutableProxyElement;
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29 import org.simantics.g2d.canvas.ICanvasContext;
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30 import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;
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31 import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;
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32 import org.simantics.g2d.canvas.impl.HintReflection.HintListener;
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33 import org.simantics.g2d.diagram.participant.ElementJSON;
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34 import org.simantics.g2d.diagram.participant.Selection;
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35 import org.simantics.g2d.element.ElementHints;
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36 import org.simantics.g2d.element.IElement;
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37 import org.simantics.ui.selection.WorkbenchSelectionUtils;
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38 import org.simantics.utils.datastructures.hints.IHintObservable;
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39 import org.simantics.utils.datastructures.hints.IHintContext.Key;
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40 import org.simantics.utils.threads.IThreadWorkQueue;
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41 import org.simantics.utils.threads.ThreadUtils;
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44 * A canvas participant that listens to the #0 mouse selection and provides it
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45 * forward through the {@link IPostSelectionProvider} interface.
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47 * @author Tuukka Lehtonen
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49 public class WorkbenchSelectionProvider extends AbstractCanvasParticipant implements IPostSelectionProvider, ElementJSON {
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51 private static final long POST_SELECTION_DELAY = 300;
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53 @Dependency protected Selection selection;
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55 protected IThreadWorkQueue swt;
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56 protected IWorkbenchPartSite site;
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57 protected ISelection currentSelection = StructuredSelection.EMPTY;
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58 protected CopyOnWriteArrayList<ISelectionChangedListener> listeners = new CopyOnWriteArrayList<ISelectionChangedListener>();
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59 protected CopyOnWriteArrayList<ISelectionChangedListener> postListeners = new CopyOnWriteArrayList<ISelectionChangedListener>();
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61 public WorkbenchSelectionProvider(IThreadWorkQueue swt) {
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65 public WorkbenchSelectionProvider(IThreadWorkQueue swt, IWorkbenchPartSite site) {
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69 site.setSelectionProvider(this);
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73 public void addedToContext(ICanvasContext ctx) {
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74 super.addedToContext(ctx);
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75 if (site != null && site.getSelectionProvider() != this) {
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76 swt.asyncExec(new Runnable() {
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79 if (site.getSelectionProvider() != WorkbenchSelectionProvider.this)
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80 site.setSelectionProvider(WorkbenchSelectionProvider.this);
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87 public void removedFromContext(ICanvasContext ctx) {
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88 if (site != null && site.getSelectionProvider() == this) {
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89 swt.asyncExec(new Runnable() {
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92 if (site.getSelectionProvider() == WorkbenchSelectionProvider.this)
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93 site.setSelectionProvider(null);
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97 super.removedFromContext(ctx);
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100 @HintListener(Class = Selection.class, Field = "SELECTION0")
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101 public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
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102 Iterable<?> selection = (Iterable<?>) newValue;
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103 final ISelection s = constructAdaptableSelection(selection);
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104 swt.asyncExec(new Runnable() {
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106 public void run() {
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107 currentSelection = s;
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108 fireSelectionChanged(s);
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109 schedulePostSelectionChanged(s);
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114 @HintListener(Class = Selection.class, Field = "SELECTION0")
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115 public void hintRemoved(IHintObservable sender, Key key, Object oldValue) {
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116 //System.out.println("selection removed: " + oldValue);
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117 final ISelection s = constructAdaptableSelection(Collections.emptyList());
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118 swt.asyncExec(new Runnable() {
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120 public void run() {
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121 currentSelection = s;
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122 fireSelectionChanged(s);
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123 schedulePostSelectionChanged(s);
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128 // Post selection changed scheduling helper.
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129 private int modCount = 0;
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131 protected void schedulePostSelectionChanged(final ISelection s) {
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132 final int count = ++modCount;
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133 ThreadUtils.getNonBlockingWorkExecutor().schedule(new Runnable() {
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135 public void run() {
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136 int newCount = modCount;
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137 if (count != newCount)
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141 swt.asyncExec(new Runnable() {
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143 public void run() {
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146 firePostSelectionChanged(s);
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150 }, POST_SELECTION_DELAY, TimeUnit.MILLISECONDS);
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153 protected ISelection constructAdaptableSelection(Iterable<?> selection) {
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154 ArrayList<Object> objects = new ArrayList<Object>();
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155 for (Object o : selection) {
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156 if (o instanceof IElement) {
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157 IElement e = (IElement) o;
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158 Object object = e.getHint(ElementHints.KEY_OBJECT);
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159 if (object != null) {
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160 objects.add(new AdaptableImmutableProxyElement(e));
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162 System.out.println(" discarding element from selection, null object for " + e);
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165 System.out.println(" unrecognized selection: " + o.getClass() + ": " + o);
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168 return new StructuredSelection(objects);
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171 void fireSelectionChanged(ISelection selection) {
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172 SelectionChangedEvent e = new SelectionChangedEvent(this, selection);
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173 for (ISelectionChangedListener l : listeners)
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174 l.selectionChanged(e);
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177 void firePostSelectionChanged(ISelection selection) {
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178 SelectionChangedEvent e = new SelectionChangedEvent(this, selection);
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179 for (ISelectionChangedListener l : postListeners)
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180 l.selectionChanged(e);
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184 public void addPostSelectionChangedListener(ISelectionChangedListener listener) {
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185 postListeners.add(listener);
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189 public void removePostSelectionChangedListener(ISelectionChangedListener listener) {
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190 postListeners.remove(listener);
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194 public void addSelectionChangedListener(ISelectionChangedListener listener) {
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195 listeners.add(listener);
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199 public void removeSelectionChangedListener(ISelectionChangedListener listener) {
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200 listeners.remove(listener);
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204 public ISelection getSelection() {
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205 return currentSelection;
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209 public void setSelection(ISelection selection) {
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210 System.out.println("WorkbenchSelectionProvider: TODO: set selection: " + selection);
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214 public Optional<String> getJSON(IElement element) {
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215 ISelection sel = constructAdaptableSelection(Collections.singleton(element));
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217 return Optional.ofNullable( WorkbenchSelectionUtils.getPossibleJSON(sel) );
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218 } catch (DatabaseException e) {
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219 Logger.defaultLogError(e);
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220 return Optional.empty();
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