--- /dev/null
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ * VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.diagram.ui;\r
+\r
+import java.util.ArrayList;\r
+import java.util.Collections;\r
+import java.util.concurrent.CopyOnWriteArrayList;\r
+import java.util.concurrent.TimeUnit;\r
+\r
+import org.eclipse.jface.viewers.IPostSelectionProvider;\r
+import org.eclipse.jface.viewers.ISelection;\r
+import org.eclipse.jface.viewers.ISelectionChangedListener;\r
+import org.eclipse.jface.viewers.SelectionChangedEvent;\r
+import org.eclipse.jface.viewers.StructuredSelection;\r
+import org.eclipse.ui.IWorkbenchPartSite;\r
+import org.simantics.diagram.elements.AdaptableImmutableProxyElement;\r
+import org.simantics.g2d.canvas.ICanvasContext;\r
+import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;\r
+import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;\r
+import org.simantics.g2d.canvas.impl.HintReflection.HintListener;\r
+import org.simantics.g2d.diagram.participant.Selection;\r
+import org.simantics.g2d.element.ElementHints;\r
+import org.simantics.g2d.element.IElement;\r
+import org.simantics.utils.datastructures.hints.IHintObservable;\r
+import org.simantics.utils.datastructures.hints.IHintContext.Key;\r
+import org.simantics.utils.threads.IThreadWorkQueue;\r
+import org.simantics.utils.threads.ThreadUtils;\r
+\r
+/**\r
+ * A canvas participant that listens to the #0 mouse selection and provides it\r
+ * forward through the {@link IPostSelectionProvider} interface.\r
+ * \r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class WorkbenchSelectionProvider extends AbstractCanvasParticipant implements IPostSelectionProvider {\r
+\r
+ private static final long POST_SELECTION_DELAY = 300;\r
+\r
+ @Dependency protected Selection selection;\r
+\r
+ protected IThreadWorkQueue swt;\r
+ protected IWorkbenchPartSite site;\r
+ protected ISelection currentSelection = StructuredSelection.EMPTY;\r
+ protected CopyOnWriteArrayList<ISelectionChangedListener> listeners = new CopyOnWriteArrayList<ISelectionChangedListener>();\r
+ protected CopyOnWriteArrayList<ISelectionChangedListener> postListeners = new CopyOnWriteArrayList<ISelectionChangedListener>();\r
+\r
+ public WorkbenchSelectionProvider(IThreadWorkQueue swt) {\r
+ this(swt, null);\r
+ }\r
+\r
+ public WorkbenchSelectionProvider(IThreadWorkQueue swt, IWorkbenchPartSite site) {\r
+ this.swt = swt;\r
+ this.site = site;\r
+ if (site != null)\r
+ site.setSelectionProvider(this);\r
+ }\r
+\r
+ @Override\r
+ public void addedToContext(ICanvasContext ctx) {\r
+ super.addedToContext(ctx);\r
+ if (site != null && site.getSelectionProvider() != this) {\r
+ swt.asyncExec(new Runnable() {\r
+ @Override\r
+ public void run() {\r
+ if (site.getSelectionProvider() != WorkbenchSelectionProvider.this)\r
+ site.setSelectionProvider(WorkbenchSelectionProvider.this);\r
+ }\r
+ });\r
+ }\r
+ }\r
+\r
+ @Override\r
+ public void removedFromContext(ICanvasContext ctx) {\r
+ if (site != null && site.getSelectionProvider() == this) {\r
+ swt.asyncExec(new Runnable() {\r
+ @Override\r
+ public void run() {\r
+ if (site.getSelectionProvider() == WorkbenchSelectionProvider.this)\r
+ site.setSelectionProvider(null);\r
+ }\r
+ });\r
+ }\r
+ super.removedFromContext(ctx);\r
+ }\r
+\r
+ @HintListener(Class = Selection.class, Field = "SELECTION0")\r
+ public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {\r
+ Iterable<?> selection = (Iterable<?>) newValue;\r
+ final ISelection s = constructAdaptableSelection(selection);\r
+ swt.asyncExec(new Runnable() {\r
+ @Override\r
+ public void run() {\r
+ currentSelection = s;\r
+ fireSelectionChanged(s);\r
+ schedulePostSelectionChanged(s);\r
+ }\r
+ });\r
+ }\r
+\r
+ @HintListener(Class = Selection.class, Field = "SELECTION0")\r
+ public void hintRemoved(IHintObservable sender, Key key, Object oldValue) {\r
+ //System.out.println("selection removed: " + oldValue);\r
+ final ISelection s = constructAdaptableSelection(Collections.emptyList());\r
+ swt.asyncExec(new Runnable() {\r
+ @Override\r
+ public void run() {\r
+ currentSelection = s;\r
+ fireSelectionChanged(s);\r
+ schedulePostSelectionChanged(s);\r
+ }\r
+ });\r
+ }\r
+\r
+ // Post selection changed scheduling helper.\r
+ private int modCount = 0;\r
+\r
+ protected void schedulePostSelectionChanged(final ISelection s) {\r
+ final int count = ++modCount;\r
+ ThreadUtils.getNonBlockingWorkExecutor().schedule(new Runnable() {\r
+ @Override\r
+ public void run() {\r
+ int newCount = modCount;\r
+ if (count != newCount)\r
+ return;\r
+ if (isRemoved())\r
+ return;\r
+ swt.asyncExec(new Runnable() {\r
+ @Override\r
+ public void run() {\r
+ if (isRemoved())\r
+ return;\r
+ firePostSelectionChanged(s);\r
+ }\r
+ });\r
+ }\r
+ }, POST_SELECTION_DELAY, TimeUnit.MILLISECONDS);\r
+ }\r
+\r
+ protected ISelection constructAdaptableSelection(Iterable<?> selection) {\r
+ ArrayList<Object> objects = new ArrayList<Object>();\r
+ for (Object o : selection) {\r
+ if (o instanceof IElement) {\r
+ IElement e = (IElement) o;\r
+ Object object = e.getHint(ElementHints.KEY_OBJECT);\r
+ if (object != null) {\r
+ objects.add(new AdaptableImmutableProxyElement(e));\r
+ } else {\r
+ System.out.println(" discarding element from selection, null object for " + e);\r
+ }\r
+ } else {\r
+ System.out.println(" unrecognized selection: " + o.getClass() + ": " + o);\r
+ }\r
+ }\r
+ return new StructuredSelection(objects);\r
+ }\r
+\r
+ void fireSelectionChanged(ISelection selection) {\r
+ SelectionChangedEvent e = new SelectionChangedEvent(this, selection);\r
+ for (ISelectionChangedListener l : listeners)\r
+ l.selectionChanged(e);\r
+ }\r
+\r
+ void firePostSelectionChanged(ISelection selection) {\r
+ SelectionChangedEvent e = new SelectionChangedEvent(this, selection);\r
+ for (ISelectionChangedListener l : postListeners)\r
+ l.selectionChanged(e);\r
+ }\r
+\r
+ @Override\r
+ public void addPostSelectionChangedListener(ISelectionChangedListener listener) {\r
+ postListeners.add(listener);\r
+ }\r
+\r
+ @Override\r
+ public void removePostSelectionChangedListener(ISelectionChangedListener listener) {\r
+ postListeners.remove(listener);\r
+ }\r
+\r
+ @Override\r
+ public void addSelectionChangedListener(ISelectionChangedListener listener) {\r
+ listeners.add(listener);\r
+ }\r
+\r
+ @Override\r
+ public void removeSelectionChangedListener(ISelectionChangedListener listener) {\r
+ listeners.remove(listener);\r
+ }\r
+\r
+ @Override\r
+ public ISelection getSelection() {\r
+ return currentSelection;\r
+ }\r
+\r
+ @Override\r
+ public void setSelection(ISelection selection) {\r
+ System.out.println("WorkbenchSelectionProvider: TODO: set selection: " + selection);\r
+ }\r
+\r
+}\r
Code Review / simantics / platform.git / blobdiff