bundles/org.simantics.workbench/src/org/simantics/workbench/internal/contributions/FlushRequestsButtonTrim.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 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.workbench.internal.contributions;\r
  13 \r
  14 import org.eclipse.jface.resource.JFaceResources;\r
  15 import org.eclipse.jface.resource.LocalResourceManager;\r
  16 import org.eclipse.swt.SWT;\r
  17 import org.eclipse.swt.events.DisposeEvent;\r
  18 import org.eclipse.swt.events.DisposeListener;\r
  19 import org.eclipse.swt.events.SelectionAdapter;\r
  20 import org.eclipse.swt.events.SelectionEvent;\r
  21 import org.eclipse.swt.layout.FillLayout;\r
  22 import org.eclipse.swt.widgets.Button;\r
  23 import org.eclipse.swt.widgets.Composite;\r
  24 import org.simantics.Simantics;\r
  25 import org.simantics.db.Session;\r
  26 import org.simantics.db.management.ISessionContext;\r
  27 import org.simantics.db.management.ISessionContextChangedListener;\r
  28 import org.simantics.db.management.ISessionContextProvider;\r
  29 import org.simantics.db.management.SessionContextChangedEvent;\r
  30 import org.simantics.ui.jobs.SessionGarbageCollectorJob;\r
  31 import org.simantics.workbench.internal.Activator;\r
  32 \r
  33 /**\r
  34  * @author Tuukka Lehtonen\r
  35  */\r
  36 public class FlushRequestsButtonTrim extends Composite {\r
  37 \r
  38     LocalResourceManager resourceManager;\r
  39 \r
  40     class SessionContextListener implements ISessionContextChangedListener {\r
  41         @Override\r
  42         public void sessionContextChanged(final SessionContextChangedEvent event) {\r
  43             if (isDisposed())\r
  44                 return;\r
  45             getDisplay().asyncExec(new Runnable() {\r
  46                 @Override\r
  47                 public void run() {\r
  48                     if (isDisposed())\r
  49                         return;\r
  50                     sessionChanged(event.getNewValue());\r
  51                 }\r
  52             });\r
  53         }\r
  54     }\r
  55 \r
  56     SessionContextListener listener = new SessionContextListener();\r
  57     private Button b;\r
  58 \r
  59     public FlushRequestsButtonTrim(Composite parent) {\r
  60         super(parent, SWT.NONE);\r
  61 \r
  62         setLayout(new FillLayout());\r
  63 \r
  64         b = new Button(this, SWT.PUSH);\r
  65         this.resourceManager = new LocalResourceManager(JFaceResources.getResources(), b);\r
  66 \r
  67         final ISessionContextProvider provider = Simantics.getSessionContextProvider();\r
  68         if (provider != null) {\r
  69             provider.addContextChangedListener(listener);\r
  70         }\r
  71 \r
  72         b.setToolTipText("Flush database caches");\r
  73         b.setImage(resourceManager.createImage(Activator.getImageDescriptor("img/paintcan.png")));\r
  74         b.addSelectionListener(new SelectionAdapter() {\r
  75             @Override\r
  76             public void widgetSelected(SelectionEvent e) {\r
  77                 Session session = Simantics.peekSession();\r
  78                 if (session != null)\r
  79                     SessionGarbageCollectorJob.getInstance().rescheduleNow();\r
  80             }\r
  81         });\r
  82         b.addDisposeListener(new DisposeListener() {\r
  83             @Override\r
  84             public void widgetDisposed(DisposeEvent e) {\r
  85                 provider.removeContextChangedListener(listener);\r
  86             }\r
  87         });\r
  88 \r
  89         sessionChanged(Simantics.getSessionContext());\r
  90     }\r
  91 \r
  92     private void sessionChanged(ISessionContext sessionContext) {\r
  93         b.setEnabled(sessionContext != null);\r
  94     }\r
  95 \r
  96 }