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• Suspending When an app is not visible in any view state, it will be suspended after five seconds (according to the wall clock) to conserve battery power. This means it remains wholly in memory but won’t be scheduled for CPU time and thus won’t have network or disk activity (except when using specifically allowed background tasks). When this happens, the app receives the Windows.UI.WebUI.WebUIApplication.onsuspending event, which is also exposed through WinJS.Application.oncheckpoint. Apps must return from this event within the five-second period, or Windows will assume the app is hung and terminate it (period!). During this time, apps save transient session state and should also release any exclusive resources acquired as well, like file streams or device access. (See How to suspend an app.) • Resuming If the user switches back to a suspended app, it receives the Windows.UI.WebUI.- WebUIApplication.onresuming event. (This is not surfaced through WinJS.Application because it’s not commonly used and WinJS has no value to add.) We’ll talk more about this in the “Data from Services and WinJS.xhr” section coming up soon, because the need for this event often arises when using services. In addition, if you’re tracking sensor input of any kind (like compass, geolocation, or orientation), resuming is a good time to get a fresh reading. You’ll also want to check license status for your app and in-app purchases if you’re using trials and/or expirations (see Chapter 17). There are also times when you might want to refresh your layout (as we’ll see in Chapter 6), because it’s possible for your app to resume directly into a different view state than when it was suspended or to a different screen resolution as when the device has been connected to an external monitor. The same goes for enabling/disabling clipboard commands. • Terminating When suspended, an app might be terminated if there’s a need for more memory. There is no event for this, because by definition the app is already suspended and no code can run. Nevertheless, this is important for the app lifecycle because it affects previousExecutionState when the app restarts. It’s very helpful to know that you can simulate these conditions in the Visual Studio debugger by using the toolbar drop-down shown in Figure 3-7. These commands will trigger the necessary events as well as set up the previousExecutionState value for the next launch of the app. (Be very grateful for these controls—there was a time when we didn’t have them, and it was painful to debug these conditions!) FIGURE 3-7 The Visual Studio toolbar drop-down to simulate suspend, resume, and terminate. We’ve briefly listed those previous states before, but let’s see how they relate to the events that get fired and the previousExecutionState value that shows up when the app is next launched. This can get a little tricky, so the transitions are illustrated in Figure 3-8 and the table below describes how the 110
previousExecutionState values are determined. Value of previousExecutionState notrunning running suspended terminated closedByUser Scenarios First run after install from Store. First run after reboot or log off. App is launched within 10 seconds of being closed by user (about the time it takes to hide, suspend, and cleanly terminate the app; if the user relaunches quickly, Windows has to immediately terminate it without finishing the suspend operation). App was terminated in Task Manager while running or closed itself with MSApp.terminateApp. App is currently running and then invoked in a way other than its app tile, such as Search, Share, secondary tiles, toast notifications, and all other contracts. When an app is running and the user taps the app tile, Windows just switches to the already-running app and without triggering activation events (though focus and visibilitychange will both be raised). App is suspended and then invoked in a way other than the app tile (as above for running). In addition to focus/visibility events, the app will also receive the resuming event. App was previously suspended and then terminated by Windows due to resource pressure. Note that this does not apply to MSApp.terminateApp because an app would have to be running to call that function. App was closed by an uninterrupted close gesture (swipe down or Alt+F4). An “interrupted” close is when the user switches back to the app within 10 seconds, in which case the previous state will be notrunning instead. FIGURE 3-8 Process lifecycle events and previousExecutionState values. The big question for the app, of course, is not so much what determines the value of previous- ExecutionState as what it should actually do with this value during activation. Fortunately, that story is a 111
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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
Page 59 and 60: QuickStart #1: Here My Am! and an I
Page 61 and 62: FIGURE 2-8 Snapped wireframe (left;
Page 63 and 64: which we’ll instantiate a Bing ma
Page 65 and 66: orientation, screen resolution, and
Page 67 and 68: FIGURE 2-12 Full-screen landscape v
Page 69 and 70: What this means is that, for the mo
Page 71 and 72: Create the map (though the namespac
Page 73 and 74: Next, in the second parameter to po
Page 75 and 76: FIGURE 2-17 Setting the Location ca
Page 77 and 78: Here we’re providing capturePhoto
Page 79 and 80: the contract is an abstraction that
Page 81 and 82: Extra Credit: Receiving Messages fr
Page 83 and 84: Note that such apps might not be ab
Page 85 and 86: Chapter 3 App Anatomy and Page Navi
Page 87 and 88: content and controls from web servi
Page 89 and 90: Such capabilities are blocked becau
Page 91 and 92: Can you do any kind of dynamic page
Page 93 and 94: appdata. This happens via Windows.S
Page 95 and 96: I don’t know about you, but I rea
Page 97 and 98: telling you to not use it! After al
Page 99 and 100: App Activation First, let me congra
Page 101 and 102: In the table, note that 80% scale t
Page 103 and 104: Activation Code Paths As we saw in
Page 105 and 106: splashScreen SplashScreen Contains
Page 107 and 108: In truth, so long as the user keeps
Page 109: Of course, setPromise ultimately do
Page 113 and 114: object to which you can add whateve
Page 115 and 116: Because we stored lastPosition in s
Page 117 and 118: FIGURE 3-9 The output of the Simple
Page 119 and 120: What about launching from the previ
Page 121 and 122: For all other details on this funct
Page 123 and 124: The Navigation App Template, PageCo
Page 125 and 126: (function () { "use strict"; WinJS.
Page 127 and 128: }, ); if (that.pageElement.winContr
Page 129 and 130: Sidebar: Helping Out IntelliSense I
Page 131 and 132: thousands of items, where tapping a
Page 133 and 134: Completing the Promises Story Whew!
Page 135 and 136: mechanism on top of singular XHR op
Page 137 and 138: The story of controls in Windows 8
Page 139 and 140: Creating or instantiating HTML cont
Page 141 and 142: Hyperlink href, target Link text L
Page 143 and 144: defined as part of the WinJS.UI nam
Page 145 and 146: Clearly, then, the bulk of the work
Page 147 and 148: var element = document.getElementBy
Page 149 and 150: This example is taken directly from
Page 151 and 152: FIGURE 4-7 Expanding a WinJS contro
Page 153 and 154: Flexbox -ms-[inline-]flexbox (value
Page 155 and 156: Note Though not shown here, you can
Page 157 and 158: For the ToggleSwitch, win-* classes
Page 159 and 160: • 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
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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
Page 659 and 660:
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
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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
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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
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You won’t hit your breakpoint imm
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If you’re using a custom commerce
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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
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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