MICROSOFT_PRESS_EBOOK_PROGRAMMING_WINDOWS_8_APPS_WITH_HTML_CSS_AND_JAVASCRIPT_PDF

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Note To run the sample you’ll need an app ID for each of the authentication providers in the various scenarios. For Facebook in Scenario 1, visit http://developers.facebook.com/setup and create an App ID/API Key for a test app. In the case of Facebook, the authentication process involves more than just checking the user’s credentials. It also needs to obtain permission for other capabilities that the app wants to use (which the user might have independently revoked directly through Facebook). As a result, the authentication process might navigate to additional pages, each of which still appears within the web authentication broker, as shown in Figure 14-4. In this case the app identity, ProgrammingWin8_AuthTest, is just one that I created through the Facebook developer setup page for the purposes of this demonstration. FIGURE 14-4 Additional authentication steps for Facebook within the web authentication broker. 662
Within the web authentication broker UI, the user might be taken through multiple pages on the provider’s site (but note that the back button next to the “Connecting to a service” title dismisses the dialog entirely). But this begs a question: how does the broker know when authentication is actually complete? On the right side of Figure 14-4, clicking the Allow button is the last step in the process, after which Facebook would normally show a login success page. In the context of an app, however, we don’t need that page to appear—we’d rather have the broker’s UI taken down so that we return to the app with the results of the authentication. What’s more, many OAuth providers don’t even have such a page—so what do we do? Fortunately, the broker takes this into account. As we’ll see in a moment, the app simply provides the URI of that final page of the provider’s process. When the broker detects that it’s navigated to that page, it removes its UI and gives the response to the app. As part of this process, Facebook saves these various permissions in its own back end for each particular user, so even if the app started the authentication process again, the user would not see the same pages shown in Figure 14-4. The user can, of course, manage these permissions when visiting Facebook through a web browser; if the user deletes the app information there, these additional authentication steps would reappear. In WinRT, the broker is represented by the Windows.Security.Authentication.Web.-WebAuthenticationBroker class. Authentication happens through its authenticateAsync methods. I say “methods” here because there are two variations. We’ll look at one here and return to the second in the next section, “Single Sign On.” This first variant of authenticateAsync method takes three arguments: • options Any combination of values from the WebAuthenticationOptions enumeration (combined with bitwise OR). Values are none (the default), silentMode (no UI is shown), useTitle (returns the window title of the webpage in the results), useHttpPost (returns the body of the page with the results), and useCorporateNetwork (to render the web page in an app container with the Private Networks (Client & Server), Enterprise Authentication, and Shared User Certificates capabilities; the app must have also declared these). • requestUri The URI (Windows.Foundation.Uri) for the provider’s authentication page along with the parameters required by the service; again, this must use the https:// URI scheme. • callbackUri The URI (Windows.Foundation.Uri) of the provider’s final page in its authentication process. The broker again uses this to determine when to take down its UI. 75 75 As described on How the web authentication broker works, requestUri and callbackUri “correspond to an Authorization Endpoint URI and Redirection URI in the OAuth 2.0 protocol. The OpenID protocol and earlier versions of OAuth have similar concepts.” 663
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Table of Contents Introduction ....
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WinJS Tools for Pages and Page Navi
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Chapter 6: Layout .................
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Design Guidelines for Settings ....
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Manipulating Audio and Video ......
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Managing Secondary Tiles ..........
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The User Profile (and the Lock Scre
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The Windows Store APIs ............
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Introduction Welcome, my friends, t
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I'm also assuming that your interes
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Acknowledgements In many ways, this
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Support for developers, however, ca
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technologies, including DirectX, XA
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The upload process will walk you th
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FIGURE 1-2 A typical app page in th
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do this, I’m sure!). In a hotel,
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The app host is more or less Intern
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Sidebar: Mixed Language Apps Window
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When snapped, on the other hand, ap
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Capability Description Prompts for
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Taking a Break, Getting Some Rest:
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So you might say, “Well, I should
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that the user has to configure the
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Fortunately, the Windows Store dash
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graphics called for in the design s
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4. After Visual Studio churns for a
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Add-AppxDevPackage. That batch file
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package, whereas a single / refers
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QuickStart #1: Here My Am! and an I
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FIGURE 2-8 Snapped wireframe (left;
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which we’ll instantiate a Bing ma
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orientation, screen resolution, and
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FIGURE 2-12 Full-screen landscape v
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What this means is that, for the mo
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Create the map (though the namespac
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Next, in the second parameter to po
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FIGURE 2-17 Setting the Location ca
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Here we’re providing capturePhoto
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the contract is an abstraction that
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Extra Credit: Receiving Messages fr
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Note that such apps might not be ab
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Chapter 3 App Anatomy and Page Navi
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content and controls from web servi
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Such capabilities are blocked becau
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Can you do any kind of dynamic page
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appdata. This happens via Windows.S
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I don’t know about you, but I rea
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telling you to not use it! After al
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App Activation First, let me congra
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In the table, note that 80% scale t
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Activation Code Paths As we saw in
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splashScreen SplashScreen Contains
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In truth, so long as the user keeps
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Of course, setPromise ultimately do
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previousExecutionState values are d
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object to which you can add whateve
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Because we stored lastPosition in s
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FIGURE 3-9 The output of the Simple
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What about launching from the previ
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For all other details on this funct
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The Navigation App Template, PageCo
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(function () { "use strict"; WinJS.
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}, ); if (that.pageElement.winContr
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Sidebar: Helping Out IntelliSense I
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thousands of items, where tapping a
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Completing the Promises Story Whew!
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mechanism on top of singular XHR op
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The story of controls in Windows 8
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Creating or instantiating HTML cont
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Hyperlink href, target Link text L
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defined as part of the WinJS.UI nam
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Clearly, then, the bulk of the work
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var element = document.getElementBy
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This example is taken directly from
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FIGURE 4-7 Expanding a WinJS contro
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Flexbox -ms-[inline-]flexbox (value
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Note Though not shown here, you can
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For the ToggleSwitch, win-* classes
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• If a WinJS.UI.Tooltip is gettin
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Custom Control Examples To see thes
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Between calendar.js and calendar.cs
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]]> Whe
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This would be appropriate if you cr
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Two-way: essentially one-way bindin
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The code for this can be found in T
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Sidebar: Data-Binding Properties of
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Implementing Two-Way Binding To imp
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• oneTime A function that just lo
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• Windows 8 apps have rich stylin
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Collection Control Basics To seek t
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indingList: bindingList, array: arr
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Now while the ListView control in S
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The header template in html/scenari
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In the modified sample I changed na
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} return groupCompareGlobalized(lef
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a function instead of a declarative
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var list = new WinJS.Binding.List()
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data-win-options="{ itemDataSource:
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e used anywhere it’s appropriate,
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If you were to provide your own nav
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sample code in this chapter’s com
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Because of data binding, changes to
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What is does have, however, is this
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What you then do inside the element
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• The groups themselves are all s
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and the current viewable area. Thou
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Styling Following the precedent of
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Technically speaking, the layout pr
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or you can set layout.groupInfo fro
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Using the first item’s dimension
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You can set a breakpoint in this fu
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Incremental Loading Apart from pote
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The yellow bars indicate execution
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If it’s not provided (as when the
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During initialization (outside the
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Chapter 6 Layout Compared to other
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that appear when needed through app
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Within the body of content, then, W
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} -ms-grid-columns: 120px 2fr 80px
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-ms-scroll-snap-x Shorthand to comb
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WinRT: filled -ms-view-state: fille
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Handling View States As I just ment
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var mql = window.matchMedia("(-ms-v
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individual items in snapped view. B
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FIGURE 6-5 Options for display size
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If your developer sensibilities obj
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Content goes here This is really
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Such a layout is most easily achiev
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Because the specs themselves are st
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/* In CSS */ #divMain { width: 100%
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CSS styles that are supported for W
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Within the activated handler docume
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Multicolumn Elements and Regions Tr
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FIGURE 6-9 CSS region chains to flo
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Chapter 7 Commanding UI For consume
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• Commands that can’t be placed
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which provide many specifics on pla
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Tip To prevent the app bar from app
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This example doesn’t provide any
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var appbar = document.getElementByI
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• afterhide occurs immediately af
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This button’s click handler uses
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In the extraClass properties we’v
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To provide graphics of your own, do
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It should come as no surprise by
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Flyouts and Menus Going back to our
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are optional with show. (Note also
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function confirmOrder() { bought =
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The point of this last example is t
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Also, go into css/header-menu.c
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In the contextmenu handler menu.sho
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Scenario 3 is identical to Scenario
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The app bar now appears as follows,
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This message will appear if the use
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Chapter 8 State, Settings, Files, a
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while our permanent home was being
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• Account and profile configurati
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By the way, you might have some rea
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var localSettings = Windows.Storage
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It is also possible to migrate app
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Tip There are some file extensions
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Sidebar: Closing Streams vs. Closin
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Using App Data APIs for State Manag
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efore setting up new defaults. As m
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Roaming State The automatic roaming
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good idea to not be too aggressive
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Each app-supplied command can do on
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There are two ways to implement thi
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function helpCommandInvoked(e) { va
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Programmatically Invoking Settings
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Sidebar: Changes to Permissions A c
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Think about this for a moment (as I
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eturns an appropriate StorageFile o
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function pickSinglePhoto() { // Ver
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When picking multiple files, the re
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indicate a new filename in which to
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scenario oriented on the music libr
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A QueryOptions is generally created
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The setPropertyPrefetch method goes
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What We’ve Just Learned • State
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Chapter 9 Input and Sensors Touch i
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• Second, when you need to handle
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One or more fingers touch the scree
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You might notice a conspicuous abse
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Note that this method has no effect
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• TouchCapabilities Properties ar
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Tip Pointer events won’t fire if
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Properties Description currentPoint
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The first step to receiving gesture
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• MSGestureHold occurs when MSPoi
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FIGURE 9-3 A conceptual representat
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FIGURE 9-4 The Input Instantiable G
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obviously a specific deceleration m
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• Process keydown, keyup, and key
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For passwords you get a key to hide
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keyboard sample. 50 Adding listener
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Standard Keystrokes The last piece
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FIGURE 9-9 The Input Ink sample wit
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(string), and timestamp (Date) prop
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Like all other WinRT APIs, however,
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Here’s an example of such code fr
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Chapter 10 Media To say that media
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movie.controls = true; document.get
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declared inline, created dynamicall
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} document.getElementById("r").styl
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function onImageError(source) { sou
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• By copying pixel data from a vi
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It’s also helpful to understand t
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Video Element Extension APIs Beyond
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vid.msInsertVideoEffect("GrayscaleT
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elements with the same source. The
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in the background. As a developer,
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function soundLevelChanged() { //Ca
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Playing Sequential Audio An app tha
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need to bypass the audio element an
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To guarantee the ordering we use Pr
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Thumbnails First, StorageFile.getTh
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or combination of System.GPS.Longit
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} return degrees + "°" + minutes +
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Most of the displayImageUI function
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provides a specific BitmapEncoder i
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method can be called only once and
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Transcoding and Custom Image Format
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Transcoding happens either from one
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In Scenario 2, the sample always us
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Media Capture There are times when
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ecordLimitationExceeded Fired when
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} captureInitSettings.videoDeviceId
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} // Add the devices to deviceList
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Streaming from a Server and Digital
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Here’s how such apps generally wo
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Next you’ll want to wire up handl
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• WinRT provides a rich API for m
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necessary. In this way, excessive a
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The Control Panel setting can be ob
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screen; the Panel animations are fo
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want to chain or synchronize animat
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Create addToList animation. var add
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CSS Animations and Transitions As n
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Animations work in an opposite mann
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Keyframes, while typically defined
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FIGURE 11-2 Output of Scenario 3 of
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What’s more, requestAnimationFram
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Still, 20% is a lot of CPU power to
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Chapter 12 Contracts Recently I dis
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File activation (file type associat
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more specific. For instance, when a
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var dataPackageTitle = document.get
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The other interesting part of Scena
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When sharing an image, don't forget
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FIGURE 12-3 The Share content targe
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• Acknowledge user actions when y
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The key here is the args.detail.sha
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target app. If you’re using image
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FIGURE 12-7 Controls to create a qu
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The question is how to wire up comm
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The Search contract that makes this
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FIGURE 12-11 The Search declaration
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} } })); In the search activation p
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} }); Windows.ApplicationModel.Sear
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The request object also has a getDe
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Type to Search The final feature of
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egistered for that type, rather tha
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At the very bottom of this UI you c
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ecord a new sound. In such cases, h
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Activation of a File Picker Provide
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Windows.ApplicationModel.Activation
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A final note is that a file picker
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}; // Create a file to provide back
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The next step for the provider is t
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FIGURE 12-18 The provider sample’
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FIGURE 12-21 The provider sample’
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• If the UI status is visible, sw
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Just as the file picker contract al
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Using the Contact Picker Contacts a
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} } }); Contact Picker Providers On
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As you can see, the homeEmail field
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Chapter 13 Tiles, Notifications, th
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FIGURE 13-1 The typical default Sta
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Selecting an item on the Start scre
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In many ways, live tiles might redu
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toss up lots of superfluous toast,
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Yet Windows doesn’t want to force
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The third way an app can issue upda
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Providing both square and wide stat
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• arguments A string that’s pas
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function activated(eventObject) { i
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16 or fewer characters that is used
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Third, if you supply an image that
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arrive on a Windows 8 machine will
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The Notifications Extensions Librar
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The other bits of the manifest that
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In such cases it would be better to
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Windows.UI.Notifications.BadgeUpdat
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you’d use start time), or the pha
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Tip The tile and badge updaters are
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eturned from page requests, as we
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through the Web platform installer.
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Toast Notifications So far in this
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FIGURE 13-16 Issuing text toasts th
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supports addImageQuery for scale, l
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A scheduled toast is created using
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To update a tile, set a badge, or i
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Your app should go through this sho
Page 611 and 612: matter of sending an XmlHttpRequest
Page 613 and 614: In the running app, the pushnotific
Page 615 and 616: Background Tasks and Lock Screen Ap
Page 617 and 618: FIGURE 13-18 The manifest editor fo
Page 619 and 620: In this code, the BackgroundTaskBui
Page 621 and 622: var internetCondition = new backgro
Page 623 and 624: The Background task sample provides
Page 625 and 626: Note Working with the lock screen i
Page 627 and 628: Debugging Background Tasks By this
Page 629 and 630: • Periodic updates for tiles and
Page 631 and 632: Network Information and Connectivit
Page 633 and 634: networkstatuschanged event that we
Page 635 and 636: Note Windows Store apps written in
Page 637 and 638: Programmatically, as noted before,
Page 639 and 640: Although this option will not set u
Page 641 and 642: hundred kilobytes—if you know fro
Page 643 and 644: Finally, avoid using XHR for large
Page 645 and 646: Starting a download transfer happen
Page 647 and 648: There is also a variation of create
Page 649 and 650: operations—it is possible to crea
Page 651 and 652: ); "form-data", "------------------
Page 653 and 654: Basically, you would change the pol
Page 655 and 656: Authentication, Credentials, and th
Page 657 and 658: The result from pickAsync, as given
Page 659 and 660: To clarify the relationship between
Page 661: There is one subtle difference betw
Page 665 and 666: https://www.facebook.com/dialog/oau
Page 667 and 668: Single Sign On with Live Connect Be
Page 669 and 670: setAccountPicturesAsync (for provid
Page 671 and 672: And lastly it’s worth at least li
Page 673 and 674: } var scenario1Link = document.getE
Page 675 and 676: } return currentFeed.items[currentI
Page 677 and 678: When data arrives, the handler rece
Page 679 and 680: } // This is a helper function echo
Page 681 and 682: On the client side, StreamSocket ag
Page 683 and 684: And closing the socket in Scenario
Page 685 and 686: In the sample, we first create a Me
Page 687 and 688: } try { var size = dataWriter.measu
Page 689 and 690: What We’ve Just Learned • Netwo
Page 691 and 692: • Connecting with devices in the
Page 693 and 694: The XInput and JavaScript controlle
Page 695 and 696: function renderLoop() { var state =
Page 697 and 698: FIGURE 15-3 Sample device enumerati
Page 699 and 700: The Removable Storage sample, in Sc
Page 701 and 702: • Communications are supported on
Page 703 and 704: Advertising a Connection Making you
Page 705 and 706: Tap to Connect and Tap to Activate
Page 707 and 708: On a simpler note, publishing a URI
Page 709 and 710: FIGURE 15-5 Scenario 2 of the Print
Page 711 and 712: Print Document Sources No matter wh
Page 713 and 714:
If you don’t add a handler for th
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The final bit to mention in the cod
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Indeed, when we speak of mixed lang
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Again, components can also make use
Page 721 and 722:
Sidebar: WinRT Components vs. Class
Page 723 and 724:
Once you add the name of a class an
Page 725 and 726:
With the basic mechanics worked out
Page 727 and 728:
As we did with C#, let’s start by
Page 729 and 730:
Comparing the Results The Image Man
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} return sum; Running a count with
Page 733 and 734:
Component Implementation • When c
Page 735 and 736:
When this worker is started, the on
Page 737 and 738:
FIGURE 16-4 A promise manages and i
Page 739 and 740:
Note that Task.Run does not support
Page 741 and 742:
As with C#, there are additional st
Page 743 and 744:
public IAsyncOperation ConvertPixel
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method called ConvertGrayscalFileAs
Page 747 and 748:
Event names, on the other hand, are
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One challenge, as we saw in the qui
Page 751 and 752:
The Building your own Windows Runti
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• Check against an encrypted lice
Page 755 and 756:
Chapter 17 Apps for Everyone: Acces
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Your App, Your Business If you chec
Page 759 and 760:
FIGURE 17-1 Creating an app package
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desktop applications and distribute
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means is that if you want to promot
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You should also strongly consider m
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• In-app purchases through the Wi
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That said, WinRT provides for the f
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When your app accesses CurrentAppSi
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} }); currentApp.licenseInformation
Page 775 and 776:
You won’t hit your breakpoint imm
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If you’re using a custom commerce
Page 779 and 780:
You might have noticed that a Produ
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Id=\"e2a62d42-dbca-43d2-b779-66eb91
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The latter two we’ve already cove
Page 785 and 786:
• aria-label Directly provides te
Page 787 and 788:
Apart from the small bits of code i
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control sample, and switch between
Page 791 and 792:
Scenario 2 shows similar effects wi
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Canvas a better choice? To this poi
Page 795 and 796:
one resource. For a few examples of
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addition of new string and image re
Page 799 and 800:
FIGURE 17-9 Control panel dialogs f
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Formatting Culture-Specific Data an
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Sorting and Grouping Just as a worl
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With images, you can reverse them w
Page 807 and 808:
Note CSS files can contain string l
Page 809 and 810:
Manifest: Let’s turn now to the m
Page 811 and 812:
Other affected files in this app in
Page 813 and 814:
Sidebar: String Resources in Settin
Page 815 and 816:
the folder name itself doesn’t us
Page 817 and 818:
If you like, you can just send your
Page 819 and 820:
FIGURE 17-11 The Multilingual App T
Page 821 and 822:
Second, the Toolkit will detect if
Page 823 and 824:
Localization Wrap-Up Well, we’re
Page 825 and 826:
Let me say that again: all of this
Page 827 and 828:
Onboarding and Working through Reje
Page 829 and 830:
Connecting Your Website If you have
Page 831 and 832:
What We’ve Just Learned • An ap
Page 833:
What do you think of this book? We
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