有这样一个需求:如果想在command执行的时候携带一些信息,然后还想获取这些信息 这个如何实现呢?
一 传值部分(传递的是ExecutionEvent,通过ExecutionEvent携带的ApplicationContext传递对象,还可以传递别的类型如MAP)
//获取ICommandService
ICommandService commandService = (ICommandService) PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getActivePart().getSite().getService(ICommandService.class);
//调用Command并传递对象
commandService.getCommand("CommandId").executeWithChecks(new ExecutionEvent(null, Collections.EMPTY_MAP, null, sendObject));
二 取值部分 这个是在command相关联的handler里取到这个ExecutionEvent,ExecutionEvent里携带相关传入的信息。
package command_test.handlers;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.handlers.HandlerUtil;
import org.eclipse.jface.dialogs.MessageDialog;
/**
* Our sample handler extends AbstractHandler, an IHandler base class.
* @see org.eclipse.core.commands.IHandler
* @see org.eclipse.core.commands.AbstractHandler
*/
public class SampleHandler extends AbstractHandler {
/**
* The constructor.
*/
public SampleHandler() {
}
/**
* the command has been executed, so extract extract the needed information
* from the application context.
*/
public Object execute(ExecutionEvent event) throws ExecutionException {
IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindowChecked(event);
MessageDialog.openInformation(
window.getShell(),
"Command_Test",
"Hello, Eclipse world");
return null;
}
}