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package eu.etaxonomy.taxeditor.ui.element;
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import java.util.Observable;
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import java.util.Observer;
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import org.eclipse.core.commands.Command;
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import org.eclipse.core.commands.ExecutionException;
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import org.eclipse.core.commands.NotEnabledException;
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import org.eclipse.core.commands.NotHandledException;
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import org.eclipse.core.commands.common.NotDefinedException;
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import org.eclipse.swt.SWT;
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import org.eclipse.swt.events.DisposeEvent;
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import org.eclipse.swt.events.DisposeListener;
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import org.eclipse.swt.events.SelectionAdapter;
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import org.eclipse.swt.events.SelectionEvent;
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import org.eclipse.swt.layout.GridData;
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import org.eclipse.swt.layout.GridLayout;
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import org.eclipse.swt.widgets.Button;
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import org.eclipse.swt.widgets.Composite;
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import org.eclipse.ui.commands.ICommandService;
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import org.eclipse.ui.handlers.IHandlerService;
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import eu.etaxonomy.taxeditor.store.CdmStore;
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import eu.etaxonomy.taxeditor.store.LoginManager;
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import eu.etaxonomy.taxeditor.store.StoreUtil;
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/**
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* A Button which executes a <code>IHandler</code> managed through a
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* <code>org.eclipse.ui.handlers</code> extension point
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*
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* see http://wiki.eclipse.org/Platform_Command_Framework#Commands
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*
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* @author a.kohlbecker
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*
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*/
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public class CommandHandlerButton extends Composite implements Observer {
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String commandId;
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Button button;
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/**
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* @param parent
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* @param style
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* @param commandId the id of the command handler as defined in a <code>org.eclipse.ui.handlers</code> extension point
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*/
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public CommandHandlerButton(Composite parent, int style, String commandId) {
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super(parent, SWT.NONE);
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this.commandId = commandId;
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setLayout(new GridLayout());
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setLayoutData(new GridData());
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button = new Button(this, style);
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button.addSelectionListener(new SelectionAdapter() {
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@Override
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public void widgetSelected(SelectionEvent se) {
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// you can execute a command directly ... but to get the proper environment it's better to execute it through the IHandlerService:
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IHandlerService handlerService = (IHandlerService) StoreUtil.getActivePart().getSite().getService(IHandlerService.class);
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try {
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handlerService.executeCommand(CommandHandlerButton.this.commandId, null);
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} catch (ExecutionException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (NotDefinedException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (NotEnabledException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (NotHandledException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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});
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updateButtonEnabledState();
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CdmStore.getLoginManager().addObserver(this);
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addDisposeListener(new DisposeListener() {
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@Override
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public void widgetDisposed(DisposeEvent e) {
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CdmStore.getLoginManager().deleteObserver(CommandHandlerButton.this);
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}
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});
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}
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/* (non-Javadoc)
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* @see java.util.Observer#update(java.util.Observable, java.lang.Object)
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*/
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@Override
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public void update(Observable o, Object arg) {
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if(o instanceof LoginManager){
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updateButtonEnabledState();
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}
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}
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private void updateButtonEnabledState() {
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ICommandService commandService = (ICommandService) StoreUtil.getActivePart().getSite().getService(ICommandService.class);
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Command command = commandService.getCommand(commandId);
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if(!button.isDisposed()){
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button.setEnabled(command != null && command.isEnabled());
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}
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}
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public void setText(String string) {
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button.setText(string);
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}
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}
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