eu.etaxonomy.taxeditor.store/src/main/java/eu/etaxonomy/taxeditor/ui/element/CommandHandlerButton.java

   1 package eu.etaxonomy.taxeditor.ui.element;
   2
   3 import java.util.Observable;
   4 import java.util.Observer;
   5
   6 import org.eclipse.core.commands.Command;
   7 import org.eclipse.core.commands.ExecutionException;
   8 import org.eclipse.core.commands.NotEnabledException;
   9 import org.eclipse.core.commands.NotHandledException;
  10 import org.eclipse.core.commands.common.NotDefinedException;
  11 import org.eclipse.swt.SWT;
  12 import org.eclipse.swt.events.DisposeEvent;
  13 import org.eclipse.swt.events.DisposeListener;
  14 import org.eclipse.swt.events.SelectionAdapter;
  15 import org.eclipse.swt.events.SelectionEvent;
  16 import org.eclipse.swt.layout.GridData;
  17 import org.eclipse.swt.layout.GridLayout;
  18 import org.eclipse.swt.widgets.Button;
  19 import org.eclipse.swt.widgets.Composite;
  20 import org.eclipse.ui.commands.ICommandService;
  21 import org.eclipse.ui.handlers.IHandlerService;
  22
  23 import eu.etaxonomy.taxeditor.store.CdmStore;
  24 import eu.etaxonomy.taxeditor.store.LoginManager;
  25 import eu.etaxonomy.taxeditor.store.StoreUtil;
  26
  27 /**
  28  * A Button which executes a <code>IHandler</code> managed through a
  29  * <code>org.eclipse.ui.handlers</code> extension point
  30  *
  31  * see http://wiki.eclipse.org/Platform_Command_Framework#Commands
  32  *
  33  * @author a.kohlbecker
  34  *
  35  */
  36 public class CommandHandlerButton extends Composite implements Observer {
  37
  38         String commandId;
  39         Button button;
  40
  41         /**
  42          * @param parent
  43          * @param style
  44          * @param commandId the id of the command handler as defined in a <code>org.eclipse.ui.handlers</code> extension point
  45          */
  46         public CommandHandlerButton(Composite parent, int style, String commandId)  {
  47                 super(parent, SWT.NONE);
  48                 this.commandId = commandId;
  49
  50                 setLayout(new GridLayout());
  51                 setLayoutData(new GridData());
  52
  53                 button = new Button(this, style);
  54                 button.addSelectionListener(new SelectionAdapter() {
  55                         @Override
  56                         public void widgetSelected(SelectionEvent se) {
  57                                 // you can execute a command directly ... but to get the proper environment it's better to execute it through the IHandlerService:
  58                                 IHandlerService handlerService =  (IHandlerService) StoreUtil.getActivePart().getSite().getService(IHandlerService.class);
  59                                 try {
  60                                         handlerService.executeCommand(CommandHandlerButton.this.commandId, null);
  61                                 } catch (ExecutionException e) {
  62                                         // TODO Auto-generated catch block
  63                                         e.printStackTrace();
  64                                 } catch (NotDefinedException e) {
  65                                         // TODO Auto-generated catch block
  66                                         e.printStackTrace();
  67                                 } catch (NotEnabledException e) {
  68                                         // TODO Auto-generated catch block
  69                                         e.printStackTrace();
  70                                 } catch (NotHandledException e) {
  71                                         // TODO Auto-generated catch block
  72                                         e.printStackTrace();
  73                                 }
  74                         }
  75
  76                 });
  77                 updateButtonEnabledState();
  78
  79                 CdmStore.getLoginManager().addObserver(this);
  80         addDisposeListener(new DisposeListener() {
  81                         @Override
  82                         public void widgetDisposed(DisposeEvent e) {
  83                                 CdmStore.getLoginManager().deleteObserver(CommandHandlerButton.this);
  84                         }
  85         });
  86         }
  87
  88
  89         /* (non-Javadoc)
  90          * @see java.util.Observer#update(java.util.Observable, java.lang.Object)
  91          */
  92         @Override
  93         public void update(Observable o, Object arg) {
  94                 if(o instanceof LoginManager){
  95                         updateButtonEnabledState();
  96                 }
  97
  98         }
  99
 100         private void updateButtonEnabledState() {
 101                 ICommandService commandService =  (ICommandService) StoreUtil.getActivePart().getSite().getService(ICommandService.class);
 102                 Command command = commandService.getCommand(commandId);
 103                 if(!button.isDisposed()){
 104                         button.setEnabled(command != null && command.isEnabled());
 105                 }
 106         }
 107
 108         public void setText(String string) {
 109                 button.setText(string);
 110         }
 111 }