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• In its event handler, the app determines whether it has anything to share in its current state. If it does, it populates the Windows.ApplicationModel.DataTransfer.DataPackage provided in the event. (This can vary with the selection or lack thereof; if the user needs to make a selection for share to work, the app can display a message to that effect.) • Based on the data formats in the package, Windows—that is, the share broker who manages the contract—determines the share target apps to display to the user. The user can also control which apps are shown through Change PC Settings > Share. • When the user picks a target, the associated app is activated and receives the data package to process however it wants. FIGURE 12-1 Processing the Share contract as initiated by the user’s selection of the Share charm. This whole process provides a very convenient shortcut for users to take something they love in one app and get it into another app with a simple edge gesture and target app selection. It’s like a semantically rich clipboard in which you don’t have to figure out how to get connected to other apps. What’s very cool about the Share contract, in other words, is that the source doesn’t have to care what happens to the data—its only role is to provide whatever data is appropriate for sharing at the moment the user invokes the Share charm (if, in fact, there is appropriate data—sometimes there isn’t). This liberates source apps from the burden of having to predict, anticipate, or second-guess what users might want to do with the data. Perhaps they want to email it, share it via social networking, drop it into a content management app…who knows? Well, only the user knows, so what the share broker does with that data is let the user decide! Given the data package from the source, the broker matches the formats in that package to target apps that have indicated support for those formats in their manifests. The broker then displays that list to the user. That list can contain apps, for one, but also something called a quicklink (a Windows.ApplicationModel.- DataTransfer.ShareTarget.Quicklink object, to be precise), which is serviced by some app but is much 494
more specific. For instance, when an email app is shown as an option for sharing, the best it can do is create a new message with no particular recipients. A quicklink, however, can identify specific email addresses, say, for a person or persons you email frequently. The quicklink, then, is essentially an app plus specific configuration information. Whatever the case, some app is launched when the user selects a target. With the Share contract, the app is launched with an activation kind of shareTarget. This tells it to not bring up its default UI but to rather show a specific share pane (with light-dismiss behavior) in which the user can refine exactly what is being shared and how. A share target for a social network, for instance, will often provide a place to add a comment on the shared data before posting it. An email app would provide a means to edit the message before sending it. A front-end app for a photo service could allow for adding a caption, specifying a location, identifying people, and so on. You get the idea. All of this combines together to provide a smooth flow from having something to share to an app that facilitates the sharing and allows the user to add customizations. Overall, then, the Share contract gets apps connected to one another for this common purpose without either one having to know anything about the other. This creates a very extensible and scalable experience: since all the potential target choices appear only in the Share charm pane, they never need to clutter a source app as we see happening on many web pages. This is the “content before chrome” design principle in action. Source apps also don’t need to update themselves when a new target becomes popular (e.g., a new kind of social network): all that’s needed is a single target app. As for those target apps, they don’t have to evangelize themselves to the world: through the contract, source apps are automatically able to use any target apps that come along in the future. And from the end user’s point of view, their experience of the Share charm gets better and better as they acquire more Share-capable apps. At the same time, it is possible for the source app to know something about how its shared data is being used. Alongside the datarequested event, the DataTransferManager also fires a targetApplicationChosen event to those sources who are listening. The eventArgs in this case contain only a single property: applicationName. This isn’t really useful for any other WinRT APIs, mind you, but is something you can tally within your own analytics. Such data can help you understand whether you’d provide a better user experience by sharing richer data formats, for example, or, if common target apps also support custom formats that you can supportin future updates. Source Apps Let’s complete our understanding of source apps now by looking at a number of details we haven’t fully explored yet, primarily around how the source populates the data package and the options it has for handling the request. For this purpose, I suggest you obtain and run both the Sharing content source app sample and the Sharing content target app sample. We’ll be looking at both of these, and the latter provides a helpful way to see how a target app will consume the data package created in the source. 495
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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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Page 449 and 450: Transcoding happens either from one
Page 451 and 452: In Scenario 2, the sample always us
Page 453 and 454: Media Capture There are times when
Page 455 and 456: ecordLimitationExceeded Fired when
Page 457 and 458: } captureInitSettings.videoDeviceId
Page 459 and 460: } // Add the devices to deviceList
Page 461 and 462: Streaming from a Server and Digital
Page 463 and 464: Here’s how such apps generally wo
Page 465 and 466: Next you’ll want to wire up handl
Page 467 and 468: • WinRT provides a rich API for m
Page 469 and 470: necessary. In this way, excessive a
Page 471 and 472: The Control Panel setting can be ob
Page 473 and 474: screen; the Panel animations are fo
Page 475 and 476: want to chain or synchronize animat
Page 477 and 478: Create addToList animation. var add
Page 479 and 480: CSS Animations and Transitions As n
Page 481 and 482: Animations work in an opposite mann
Page 483 and 484: Keyframes, while typically defined
Page 485 and 486: FIGURE 11-2 Output of Scenario 3 of
Page 487 and 488: What’s more, requestAnimationFram
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Page 491 and 492: Chapter 12 Contracts Recently I dis
Page 493: File activation (file type associat
Page 497 and 498: var dataPackageTitle = document.get
Page 499 and 500: The other interesting part of Scena
Page 501 and 502: When sharing an image, don't forget
Page 503 and 504: FIGURE 12-3 The Share content targe
Page 505 and 506: • Acknowledge user actions when y
Page 507 and 508: The key here is the args.detail.sha
Page 509 and 510: target app. If you’re using image
Page 511 and 512: FIGURE 12-7 Controls to create a qu
Page 513 and 514: The question is how to wire up comm
Page 515 and 516: The Search contract that makes this
Page 517 and 518: FIGURE 12-11 The Search declaration
Page 519 and 520: } } })); In the search activation p
Page 521 and 522: } }); Windows.ApplicationModel.Sear
Page 523 and 524: The request object also has a getDe
Page 525 and 526: Type to Search The final feature of
Page 527 and 528: egistered for that type, rather tha
Page 529 and 530: At the very bottom of this UI you c
Page 531 and 532: ecord a new sound. In such cases, h
Page 533 and 534: Activation of a File Picker Provide
Page 535 and 536: Windows.ApplicationModel.Activation
Page 537 and 538: A final note is that a file picker
Page 539 and 540: }; // Create a file to provide back
Page 541 and 542: The next step for the provider is t
Page 543 and 544: 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
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matter of sending an XmlHttpRequest
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In the running app, the pushnotific
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Background Tasks and Lock Screen Ap
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FIGURE 13-18 The manifest editor fo
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In this code, the BackgroundTaskBui
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var internetCondition = new backgro
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The Background task sample provides
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Note Working with the lock screen i
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Debugging Background Tasks By this
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• Periodic updates for tiles and
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Network Information and Connectivit
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networkstatuschanged event that we
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Note Windows Store apps written in
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Programmatically, as noted before,
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Although this option will not set u
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hundred kilobytes—if you know fro
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Finally, avoid using XHR for large
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Starting a download transfer happen
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There is also a variation of create
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operations—it is possible to crea
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); "form-data", "------------------
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Basically, you would change the pol
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Authentication, Credentials, and th
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The result from pickAsync, as given
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To clarify the relationship between
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There is one subtle difference betw
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Within the web authentication broke
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https://www.facebook.com/dialog/oau
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Single Sign On with Live Connect Be
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setAccountPicturesAsync (for provid
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And lastly it’s worth at least li
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} var scenario1Link = document.getE
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} return currentFeed.items[currentI
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When data arrives, the handler rece
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} // This is a helper function echo
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On the client side, StreamSocket ag
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And closing the socket in Scenario
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In the sample, we first create a Me
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} try { var size = dataWriter.measu
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What We’ve Just Learned • Netwo
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• Connecting with devices in the
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The XInput and JavaScript controlle
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function renderLoop() { var state =
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FIGURE 15-3 Sample device enumerati
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The Removable Storage sample, in Sc
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• Communications are supported on
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Advertising a Connection Making you
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Tap to Connect and Tap to Activate
Page 707 and 708:
On a simpler note, publishing a URI
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FIGURE 15-5 Scenario 2 of the Print
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Print Document Sources No matter wh
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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
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Sidebar: WinRT Components vs. Class
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Once you add the name of a class an
Page 725 and 726:
With the basic mechanics worked out
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As we did with C#, let’s start by
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Comparing the Results The Image Man
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} return sum; Running a count with
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Component Implementation • When c
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When this worker is started, the on
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FIGURE 16-4 A promise manages and i
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Note that Task.Run does not support
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As with C#, there are additional st
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public IAsyncOperation ConvertPixel
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method called ConvertGrayscalFileAs
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Event names, on the other hand, are
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One challenge, as we saw in the qui
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The Building your own Windows Runti
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• Check against an encrypted lice
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Chapter 17 Apps for Everyone: Acces
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Your App, Your Business If you chec
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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
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• aria-label Directly provides te
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Apart from the small bits of code i
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control sample, and switch between
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Scenario 2 shows similar effects wi
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Canvas a better choice? To this poi
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one resource. For a few examples of
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addition of new string and image re
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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
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Note CSS files can contain string l
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Manifest: Let’s turn now to the m
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Other affected files in this app in
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Sidebar: String Resources in Settin
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the folder name itself doesn’t us
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If you like, you can just send your
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FIGURE 17-11 The Multilingual App T
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Second, the Toolkit will detect if
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Localization Wrap-Up Well, we’re
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Let me say that again: all of this
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Onboarding and Working through Reje
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Connecting Your Website If you have
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What We’ve Just Learned • An ap
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What do you think of this book? We
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