Examples of com.google.gwt.user.client.Command

com.google.gwt.user.client.Command
Encapsulates an action for later execution, often from a different context.
The Command interface provides a layer of separation between the code specifying some behavior and the code invoking that behavior. This separation aids in creating reusable code. For example, a {@link com.google.gwt.user.client.ui.MenuItem} can have a Commandassociated with it that it executes when the menu item is chosen by the user. Importantly, the code that constructed the Command to be executed when the menu item is invoked knows nothing about the internals of the MenuItem class and vice-versa.

The Command interface is often implemented with an anonymous inner class. For example,
```
 Command sayHello = new Command() { public void execute() { Window.alert("Hello"); } }; sayHello.execute(); 
```

          parentMenu.addItem(actions[i].getActionCaption(), subMenu);
          someItemAdded = true;
        }
      }
      else {
        Command cmd = null;
        if (actions[i] instanceof IAddFormProvider) {
          IAddForm form = ((IAddFormProvider)actions[i]).getAddForm(null);
          
          if (AuthorizationProvider.isObjectAuthorized(form))
            cmd = new AddFormCommand(form);

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        //Fire event to ensure parent Widgets correct their state depending on selection
        final HasValueChangeHandlers<OperatorSelection> source = this;
        final OperatorSelection selection = new OperatorSelection( selected,
                                                                   selectedText );
        Scheduler.get().scheduleFinally( new Command() {


            public void execute() {
                operatorChanged( selection );
                ValueChangeEvent.fire( source,
                                       selection );

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    }


    protected void clickLoadHistory() {
        showBusyIcon();
        Scheduler scheduler = Scheduler.get();
        scheduler.scheduleDeferred( new Command() {
            public void execute() {
                loadHistoryData();
            }
        } );

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                            restore.addClickHandler( new ClickHandler() {


                                public void onClick( ClickEvent event ) {
                                    restore( (Widget) event.getSource(),
                                            versionUUID,
                                            new Command() {
                                                public void execute() {
                                                    clientFactory.getEventBus().fireEvent( new RefreshAssetEditorEvent(uuid) );
                                                    pop.hide();
                                                }
                                            } );

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    private void restore( Widget w,
                          final String versionUUID,
                          final Command refresh ) {


        final CheckinPopup pop = new CheckinPopup( constants.RestoreThisVersionQ() );
        pop.setCommand( new Command() {
            public void execute() {
                RepositoryServiceFactory.getAssetService().restoreVersion( versionUUID,
                        uuid,
                        pop.getCheckinComment(),
                        new GenericCallback<Void>() {

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    }


    private void submit(Path path) {
        uploadWidget.submit( path,
                             URLHelper.getServletUrl(),
                             new Command() {


                                 @Override
                                 public void execute() {
                                     BusyPopup.close();
                                     notifySuccess();
                                 }


                             },
                             new Command() {


                                 @Override
                                 public void execute() {
                                     BusyPopup.close();
                                 }

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        } else {
            this.format = formatToImport;
        }
       


        Scheduler.get().scheduleDeferred( new Command() {
            public void execute() {
                loadAssetList();
            }
        });

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                String[] wsUUIDs = new String[selectedFacts.getItemCount()];
                for (int i = 0; i < selectedFacts.getItemCount(); i++) {
                    wsUUIDs[i] = selectedFacts.getValue(i);
                }


                WorkingSetManager.getInstance().applyWorkingSets(asset.getMetaData().getPackageName(), wsUUIDs, new Command() {
                        public void execute() {
                            LoadingPopup.close();
                            pop.hide();
                            modeller.refreshWidget();
                            modeller.verifyRule(null, true);

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                                                                    this.fieldName,
                                                                    this.sce,
                                                                    this.constraint,
                                                                    !this.readOnly );
            if ( !this.readOnly ) {
                enumDropDown.setOnValueChangeCommand( new Command() {


                    public void execute() {
                        executeOnValueChangeCommand();
                    }
                } );
            }
            return enumDropDown;
        }


        //Date picker
        boolean isCEPOperator = false;
        if ( this.constraint instanceof HasOperator ) {
            isCEPOperator = SuggestionCompletionEngine.isCEPOperator( ((HasOperator) this.constraint).getOperator() );
        }
        if ( SuggestionCompletionEngine.TYPE_DATE.equals( this.fieldType ) || (SuggestionCompletionEngine.TYPE_THIS.equals( this.fieldType ) && isCEPOperator) ) {


            DatePickerLabel datePicker = new DatePickerLabel( constraint.getValue() );
            this.constraint.setValue( datePicker.getDateString() );


            if ( !this.readOnly ) {
                datePicker.addValueChanged( new ValueChanged() {


                    public void valueChanged(String newValue) {
                        executeOnValueChangeCommand();
                        constraint.setValue( newValue );
                    }
                } );


                return datePicker;


            } else {
                return new SmallLabel( this.constraint.getValue() );
            }
        }


        //Default editor
        if ( !this.readOnly ) {
            DefaultLiteralEditor dle = new DefaultLiteralEditor( this.constraint,
                                                                 this.isNumeric );
            dle.setOnValueChangeCommand( new Command() {


                public void execute() {
                    executeOnValueChangeCommand();
                }
            } );

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            public void onExpressionTypeChanged(ExpressionTypeChangeEvent event) {
                System.out.println( "type changed: " + event.getOldType() + " -> " + event.getNewType() );
            }
        } );
        builder.addOnModifiedCommand( new Command() {


            public void execute() {
                executeOnValueChangeCommand();
            }
        } );

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