eclipse default handler IHandler interface “the chosen operation is not enabled”

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NOTE: These two methods:

Tip: Subclass AbstractHandler rather than implementing IHandler. but you can use it to the below section you need to set:

 

IHandler the chosen operation is not enabled

NOT USE popupMenus instead of Menus

isEnabled: should be set to true

isHandled:should be set to true

 

import org.eclipse.core.commands.AbstractHandler;import org.eclipse.core.commands.ExecutionEvent;import org.eclipse.core.commands.ExecutionException;import org.eclipse.core.commands.IHandler;import org.eclipse.core.commands.IHandlerListener;import org.eclipse.jface.dialogs.MessageDialog;import org.eclipse.swt.widgets.MessageBox;import org.eclipse.ui.IWorkbenchWindow;import org.eclipse.ui.handlers.HandlerUtil;public class MyHandler implements IHandler {    private FontChanger font=FontChanger.getInstance();    @Override    public Object execute(ExecutionEvent event) throws ExecutionException {        // TODO Auto-generated method stub                IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindowChecked(event);        MessageDialog.openInformation(                window.getShell(),                "Demo",                "Hello, Eclipse world");        font.decreaseSize();        return null;    }    @Override    public void addHandlerListener(IHandlerListener handlerListener) {        // TODO Auto-generated method stub            }    @Override    public void dispose() {        // TODO Auto-generated method stub            }    @Override    public boolean isEnabled() {        // TODO Auto-generated method stub        return true;    }    @Override    public boolean isHandled() {        // TODO Auto-generated method stub        return true;    }    @Override    public void removeHandlerListener(IHandlerListener handlerListener) {        // TODO Auto-generated method stub            }    }

eclipse default handler IHandler interface “the chosen operation is not enabled”