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(); 
```

            final String target = open.getStringAttribute("name");
            if (target == null) {
                // source will be opened to this browser window, but we may have
                // to finish rendering this window in case this is a download
                // (and window stays open).
                Scheduler.get().scheduleDeferred(new Command() {
                    @Override
                    public void execute() {
                        VUI.goTo(url);
                    }
                });
            } else if ("_self".equals(target)) {
                // This window is closing (for sure). Only other opens are
                // relevant in this change. See #3558, #2144
                isClosed = true;
                VUI.goTo(url);
            } else {
                String options;
                boolean alwaysAsPopup = true;
                if (open.hasAttribute("popup")) {
                    alwaysAsPopup = open.getBooleanAttribute("popup");
                }
                if (alwaysAsPopup) {
                    if (open.hasAttribute("border")) {
                        if (open.getStringAttribute("border").equals("minimal")) {
                            options = "menubar=yes,location=no,status=no";
                        } else {
                            options = "menubar=no,location=no,status=no";
                        }


                    } else {
                        options = "resizable=yes,menubar=yes,toolbar=yes,directories=yes,location=yes,scrollbars=yes,status=yes";
                    }


                    if (open.hasAttribute("width")) {
                        int w = open.getIntAttribute("width");
                        options += ",width=" + w;
                    }
                    if (open.hasAttribute("height")) {
                        int h = open.getIntAttribute("height");
                        options += ",height=" + h;
                    }


                    Window.open(url, target, options);
                } else {
                    open(url, target);
                }
            }
            childIndex++;
        }
        if (isClosed) {
            // We're navigating away, so stop the application.
            client.setApplicationRunning(false);
            return;
        }


        // Handle other UIDL children
        UIDL childUidl;
        while ((childUidl = uidl.getChildUIDL(childIndex++)) != null) {
            String tag = childUidl.getTag().intern();
            if (tag == "actions") {
                if (getWidget().actionHandler == null) {
                    getWidget().actionHandler = new ShortcutActionHandler(
                            getWidget().id, client);
                }
                getWidget().actionHandler.updateActionMap(childUidl);
            } else if (tag == "notifications") {
                for (final Iterator<?> it = childUidl.getChildIterator(); it
                        .hasNext();) {
                    final UIDL notification = (UIDL) it.next();
                    VNotification.showNotification(client, notification);
                }
            } else if (tag == "css-injections") {
                injectCSS(childUidl);
            }
        }


        if (uidl.hasAttribute("focused")) {
            // set focused component when render phase is finished
            Scheduler.get().scheduleDeferred(new Command() {
                @Override
                public void execute() {
                    ComponentConnector paintable = (ComponentConnector) uidl
                            .getPaintableAttribute("focused", getConnection());

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    public void scrollIntoView(final ComponentConnector componentConnector) {
        if (componentConnector == null) {
            return;
        }


        Scheduler.get().scheduleDeferred(new Command() {
            @Override
            public void execute() {
                componentConnector.getWidget().getElement().scrollIntoView();
            }
        });

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        // Fix for #14413. Any pseudo elements inside these elements are not
        // visible on initial render unless we shake the DOM.
        if (BrowserInfo.get().isIE8()) {
            closeBox.getStyle().setDisplay(Display.NONE);
            maximizeRestoreBox.getStyle().setDisplay(Display.NONE);
            Scheduler.get().scheduleFinally(new Command() {
                @Override
                public void execute() {
                    closeBox.getStyle().clearDisplay();
                    maximizeRestoreBox.getStyle().clearDisplay();
                }

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     * For internal use only. May be removed or replaced in the future.
     */
    public static void deferOrdering() {
        if (!orderingDefered) {
            orderingDefered = true;
            Scheduler.get().scheduleFinally(new Command() {


                @Override
                public void execute() {
                    doServerSideOrdering();
                    VNotification.bringNotificationsToFront();

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    public void setVisible(boolean visible) {
        if (isVisible() != visible) {
            super.setVisible(visible);
            if (initializedAndAttached) {
                if (visible) {
                    Scheduler.get().scheduleDeferred(new Command() {


                        @Override
                        public void execute() {
                            scrollBodyPanel
                                    .setScrollPosition(measureRowHeightOffset(firstRowInViewPort));

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        if (BrowserInfo.get().isSafari() && event != null && scrollTop == 0) {
            // due to the webkitoverflowworkaround, top may sometimes report 0
            // for webkit, although it really is not. Expecting to have the
            // correct
            // value available soon.
            Scheduler.get().scheduleDeferred(new Command() {


                @Override
                public void execute() {
                    onScroll(null);
                }

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                    && getSelected().getSubMenu() != null) {
                // If the item has a sub menu then show it and move the
                // selection there
                openMenuAndFocusFirstIfPossible(getSelected());
            } else {
                Command command = getSelected().getCommand();
                if (command != null) {
                    command.execute();
                }


                setSelected(null);
                hideParents(true);
            }

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        if (finalTarget instanceof BeforeShortcutActionListener) {
            ((BeforeShortcutActionListener) finalTarget)
                    .onBeforeShortcutAction(event);
        } else {
            shakeTarget(et);
            Scheduler.get().scheduleDeferred(new Command() {
                @Override
                public void execute() {
                    shakeTarget(et);
                }
            });
        }


        Scheduler.get().scheduleDeferred(new Command() {
            @Override
            public void execute() {
                if (finalTarget != null) {
                    client.updateVariable(paintableId, "actiontarget",
                            finalTarget, false);

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        blur(e);
        if (BrowserInfo.get().isOpera()) {
            // will mess up with focus and blur event if the focus is not
            // deferred. Will cause a small flickering, so not doing it for all
            // browsers.
            Scheduler.get().scheduleDeferred(new Command() {
                @Override
                public void execute() {
                    focus(e);
                }
            });

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    /**
     * Called by JSNI (hooked via {@link #onloadstrategy})
     */
    private void onSubmitComplete() {
        /* Needs to be run dereferred to avoid various browser issues. */
        Scheduler.get().scheduleDeferred(new Command() {
            @Override
            public void execute() {
                if (submitted) {
                    if (client != null) {
                        if (t != null) {

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