eu.etaxonomy.taxeditor.store/src/main/java/eu/etaxonomy/taxeditor/view/AbstractCdmEditorViewPart.java

   1 /**
   2  *
   3  */
   4 package eu.etaxonomy.taxeditor.view;
   5
   6 import org.eclipse.jface.viewers.ISelection;
   7 import org.eclipse.swt.widgets.Composite;
   8 import org.eclipse.swt.widgets.Display;
   9 import org.eclipse.ui.IEditorPart;
  10 import org.eclipse.ui.IWorkbenchPart;
  11
  12 import eu.etaxonomy.taxeditor.editor.ISecuredEditor;
  13 import eu.etaxonomy.taxeditor.model.AbstractUtility;
  14 import eu.etaxonomy.taxeditor.model.IDirtyMarkable;
  15
  16 /**
  17  * <p>
  18  * Abstract AbstractCdmEditorViewPart class.
  19  * </p>
  20  *
  21  * @author n.hoffmann
  22  * @created Sep 21, 2010
  23  * @version 1.0
  24  */
  25 public abstract class AbstractCdmEditorViewPart extends AbstractCdmViewPart {
  26
  27     private DelaySelection delaySelection = null;
  28     /**
  29      * This is the monitor for the DelaySelection runnable.
  30      * If it is <code>true</code> then it is currently delaying a selection.
  31      */
  32     private boolean isInDelay;
  33
  34
  35     /**
  36      * This class invokes internal_selectionChanged() in a separate thread.
  37      * This allows an asynchronous and/or delayed handling of selection changes
  38      */
  39     private class DelaySelection implements Runnable{
  40         private IWorkbenchPart part;
  41         private ISelection selection;
  42
  43         public DelaySelection(IWorkbenchPart part, ISelection selection) {
  44             super();
  45             this.part = part;
  46             this.selection = selection;
  47         }
  48
  49         @Override
  50         public void run() {
  51             try{
  52                 selectionChanged_internal(part, selection);
  53             }
  54             finally{
  55                 isInDelay = false;
  56             }
  57         }
  58
  59         public synchronized void setSelection(ISelection selection) {
  60             this.selection = selection;
  61         }
  62
  63         public synchronized void setPart(IWorkbenchPart part) {
  64             this.part = part;
  65         }
  66
  67     }
  68
  69     /**
  70      * Handle selection change events here and <b>not</b> in
  71      * {@link AbstractCdmEditorViewPart#selectionChanged(IWorkbenchPart, ISelection)}
  72      * if you want asynchronous selection handling.
  73      * @param part The workbench part that has issued the selection change
  74      * @param selection the new selection
  75      */
  76     protected abstract void selectionChanged_internal(IWorkbenchPart part, ISelection selection);
  77
  78     /** {@inheritDoc} */
  79     @Override
  80     public void selectionChanged(IWorkbenchPart part, ISelection selection) {
  81         if(delaySelection==null){
  82             delaySelection = new DelaySelection(part, selection);
  83         }
  84         delaySelection.setPart(part);
  85         delaySelection.setSelection(selection);
  86         if(!isInDelay){
  87             isInDelay = true;
  88             Display.getCurrent().asyncExec(delaySelection);
  89         }
  90     }
  91
  92     /** {@inheritDoc} */
  93     @Override
  94     public void createPartControl(Composite parent) {
  95         super.createPartControl(parent);
  96         isInDelay = false;
  97     }
  98
  99     /**
 100      * <p>
 101      * getEditor
 102      * </p>
 103      *
 104      * @return the currently active editor
 105      */
 106     public IEditorPart getEditor() {
 107         return AbstractUtility.getActiveEditor();
 108     }
 109
 110     /** {@inheritDoc} */
 111     @Override
 112     public void setFocus() {
 113         super.setFocus();
 114
 115         if(getEditor() != null && ISecuredEditor.class.isAssignableFrom(getEditor().getClass())){
 116             boolean doEnable = ((ISecuredEditor)getEditor()).permissionsSatisfied();
 117             setEnabled(doEnable);
 118         }
 119     }
 120
 121     /** {@inheritDoc} */
 122     @Override
 123     public void changed(Object object) {
 124         if (part instanceof AbstractCdmViewPart) {
 125             ((AbstractCdmViewPart) part).changed(object);
 126         } else {
 127             IEditorPart editor = getEditor();
 128             if (editor != null && editor instanceof IDirtyMarkable) {
 129                 ((IDirtyMarkable) editor).changed(object);
 130             }
 131         }
 132     }
 133
 134 }