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for (String key : keySet()) { result += separator + key + "=" + get(key); separator = "\n"; } return result; } }
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We ll get back to this class in 13, when we ll write some automatic tests for it, and in 15, where we build an independent module out of it
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Creating a Menu
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The same mechanism we used for history management can be used to build a menu (Think about common bar-styled menus, with drop-down options, as seen in most desktop applications; that s our goal here) GWT s implementation of menus require Command objects, and because we always want to go to a part of our application, it makes sense creating an appropriate class Because all launching code goes in the Environment class, our new class also goes there
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protected class HistoryCommand implements Command { String historyToken;
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public HistoryCommand(final String newToken) { historyToken = newToken; }
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public void execute() { launch(historyToken); } }
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In case we want to do something that doesn t fit this pattern, we can just use a simple
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Command object, as in the following example
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Command sorry = new Command() { @Override public void execute() { showAlert("Sorry, this isn't ready yet"); } };
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Building the menu is standard fare; you could create a specific version for each user if you want (Because this kind of code is quite suitable for automatic generation, we shall be writing an appropriate code generator later in this chapter when we consider deferred binding and code generators) The first part of our code just creates the bar on
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top of the screen and a panel below it (where forms will be shown) and then goes on to check whether an initial token was provided; if so, the correct form is launched We use a Grid object to place objects onscreen; you could also work with CSS if you prefer designing screens in that way
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final Grid rootDisplay = new Grid(2, 1); final MenuBar runMenuBar = new MenuBar(); final VerticalPanel runPanel = new VerticalPanel(); private void showMainMenu() { // TODO Use user information for menu configuration runMenuBarclearItems(); runMenuBarsetWidth("100%"); createMenu(runMenuBar); rootDisplaysetWidth("100%"); rootDisplaysetWidget(0, 0, runMenuBar); rootDisplaysetWidget(1, 0, runPanel); RootPanelget()clear(); RootPanelget()add(rootDisplay); /* * If the application was started with a token, now that * the user is logged in, it's time to show it * * Don't forget to clear startingToken, or after a * logout/login, we will go back again to it */ if (!startingTokenisEmpty()) { launch(startingToken); startingToken = ""; } }
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Creating the menu by hand isn t complicated; only sort of boring We are dealing with a single menu here; a more complex application could build different menus depending on a user type parameter
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private void createMenu(MenuBar mb) { // TODO Add user type parameter, for specific menu // generation mbaddItem("dummy#1", new HistoryCommand( DummyOnePresenterPLACE + " parameter=value")); mbaddItem("dummy#2", new HistoryCommand( DummyTwoPresenterPLACE));
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MenuBar mb2 = new MenuBar(true); mb2addItem("subitem1", sorry); mb2addItem("subitem2", sorry); mb2addItem("subitem3", sorry); mb2addItem("subitem4", sorry); mbaddItem("submenu", mb2); mbaddItem("login", new HistoryCommand( LoginPresenterPLACE)); }
GWT also provides Hyperlink widgets, which work with the History mechanism We could let the user open any desired form, and even pass parameters to it, by writing something along the lines of
new Hyperlink("Go to Dummy #1", DummyOnePresenterPLACE+" parameter=value");
Detecting the User s Browser
Though GWT does a good job of detecting your browser type (and generating code that best suits it) you might want to generate different code depending on what kind of browser the user has We will examine a classic way of doing this similar to the ways you may do this in JavaScript and a GWT-ish way of accomplishing the same task, by using deferred bindings By the way, if you need a reason for doing this (and it d better be good, because you are doing away with one of GWT strengths!) you might think about generating HTML 5 tags for video watching, or dealing with the different tags required for Flash playback in Firefox and IE (Think the now-deprecated <EMBED> tag in opposition to the modern <OBJECT> tag) However, it can be argued that these concerns are becoming moot because all modern browsers are converging toward actual standards compliance In any case, doing this kind of job will let us learn a bit more about deferred binding replacement, a most powerful device If you are not totally convinced that generating HTML code on your own will be a great idea, you might really be satisfied with simply excluding older Internet Explorer browsers from being used So, in this section we ll see different methods of detecting your user s browser and react accordingly