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(unlike having to configure a display driver). Second, a device may be connected to an external display, meaning that apps need to adjust themselves to different resolutions on the fly and possibly also different pixel densities. Third, users have the ability in landscape mode to “snap” apps to the left or right side of the screen, where the snapped app is shown in a 320px wide area and another in the “filled” area that occupies the remainder of the display. This is accomplished using touch or mouse gestures, or using the Windows+. (period) and Windows+> (shift+period) keystrokes. (Snapped view requires a display that’s at least 1366x768; otherwise it’s disabled.) You definitely want to test your app with all of these variances: view states, display sizes, and pixel densities. View states can be tested directly on any given machine, but for the latter two, the Visual Studio simulator and the Device tab of Blend let you simulate different conditions. Our question now is how an app handles them. View States We already got an introduction to the four view states in Chapter 1, “The Life Story of a Windows Store app” (see Figure 1-6). Let’s now add the next level of precision as described in the following table, which includes an image of the space occupied by the app, a description of the view state, and the identifiers for that state as found in both WinRT (in the Windows.UI.ViewManagement.-ApplicationViewState enumeration) and the -ms-view-state media feature for <strong>CSS</strong> media queries: Space Occupied by the App (Blue) Details App is in landscape mode occupying the entire screen. WinRT: fullScreenLandscape -ms-view-state: fullscreen-landscape App is occupying either left or right side of a landscape screen, in an area that is always 320 pixels wide. This means you do not need to design for all possible sizes between snapped, filled (see below), and full-screen states. WinRT: snapped -ms-view-state: snapped 242
WinRT: filled -ms-view-state: filled App is occupying the area of the screen next to a snapped app. The width will be the screen size minus 320px minus 22px for the splitter. WinRT: fullScreenPortrait -ms-view-state: fullscreen-portrait App is in portrait mode Remember again that every page of your app needs to be prepared for all four view states (with some exceptions as described in the sidebar below, “Preferred Orientation and Locking Orientation”). View states are always under the user’s control, so any page can be placed into any view state at any time, even on startup. Repeat this like a mantra, because many designers and developers forget this fact! Note It’s possible that your app might be launched directly into snapped view, as through a user gesture that pulls the app from the left edge of the screen to a snapped state. So be prepared for this possibility. Remember also that any extended splash screen in your app is a page that is also subject to view states. In fact, it’s highly likely that a user will snap an app that’s taking a while to load! At the same time, you cannot programmatically control your app’s view state on activation, so it never needs to be saved or restored as part of session state. An app’s design should thus include all view states for each page, just like we did with the Here My Am! wireframes in Chapter 2. At the same time, handling view states for every page this does not mean four distinct implementations of the app. View states are just that: they are different views of the same page content as described on Guidelines for snapped and fill views. That is, switching between view states always maintains the state of the app and the page—it never changes modes or navigates to another page. The only exception to this rule is that if an app can’t reasonably operate in snap state (like a game that needs a certain amount of screen space to be playable), it can display a message to that effect along with instructions to “Tap here to resume,” which reflects the user’s goal in such a gesture. In response to such a tap, the app can call Windows.UI.ViewManagement.Application-View.tryUnsnap, 243
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1 99
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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
Page 191 and 192: } return groupCompareGlobalized(lef
Page 193 and 194: a function instead of a declarative
Page 195 and 196: var list = new WinJS.Binding.List()
Page 197 and 198: data-win-options="{ itemDataSource:
Page 199 and 200: e used anywhere it’s appropriate,
Page 201 and 202: If you were to provide your own nav
Page 203 and 204: sample code in this chapter’s com
Page 205 and 206: Because of data binding, changes to
Page 207 and 208: What is does have, however, is this
Page 209 and 210: What you then do inside the element
Page 211 and 212: • The groups themselves are all s
Page 213 and 214: and the current viewable area. Thou
Page 215 and 216: Styling Following the precedent of
Page 217 and 218: Technically speaking, the layout pr
Page 219 and 220: or you can set layout.groupInfo fro
Page 221 and 222: Using the first item’s dimension
Page 223 and 224: You can set a breakpoint in this fu
Page 225 and 226: Incremental Loading Apart from pote
Page 227 and 228: The yellow bars indicate execution
Page 229 and 230: If it’s not provided (as when the
Page 231 and 232: During initialization (outside the
Page 233 and 234: Chapter 6 Layout Compared to other
Page 235 and 236: that appear when needed through app
Page 237 and 238: Within the body of content, then, W
Page 239 and 240: } -ms-grid-columns: 120px 2fr 80px
Page 241: -ms-scroll-snap-x Shorthand to comb
Page 245 and 246: Handling View States As I just ment
Page 247 and 248: var mql = window.matchMedia("(-ms-v
Page 249 and 250: individual items in snapped view. B
Page 251 and 252: FIGURE 6-5 Options for display size
Page 253 and 254: If your developer sensibilities obj
Page 255 and 256: Content goes here This is really
Page 257 and 258: Such a layout is most easily achiev
Page 259 and 260: Because the specs themselves are st
Page 261 and 262: /* In CSS */ #divMain { width: 100%
Page 263 and 264: CSS styles that are supported for W
Page 265 and 266: Within the activated handler docume
Page 267 and 268: Multicolumn Elements and Regions Tr
Page 269 and 270: FIGURE 6-9 CSS region chains to flo
Page 271 and 272: Chapter 7 Commanding UI For consume
Page 273 and 274: • Commands that can’t be placed
Page 275 and 276: which provide many specifics on pla
Page 277 and 278: Tip To prevent the app bar from app
Page 279 and 280: This example doesn’t provide any
Page 281 and 282: var appbar = document.getElementByI
Page 283 and 284: • afterhide occurs immediately af
Page 285 and 286: This button’s click handler uses
Page 287 and 288: In the extraClass properties we’v
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Page 291 and 292: 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
Page 587 and 588:
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
Page 603 and 604:
supports addImageQuery for scale, l
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A scheduled toast is created using
Page 607 and 608:
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
Page 619 and 620:
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
Page 637 and 638:
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
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
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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 and 662:
There is one subtle difference betw
Page 663 and 664:
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
Page 671 and 672:
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
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
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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
Page 715 and 716:
The final bit to mention in the cod
Page 717 and 718:
Indeed, when we speak of mixed lang
Page 719 and 720:
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
Page 731 and 732:
} 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
Page 745 and 746:
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
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The Building your own Windows Runti
Page 753 and 754:
• Check against an encrypted lice
Page 755 and 756:
Chapter 17 Apps for Everyone: Acces
Page 757 and 758:
Your App, Your Business If you chec
Page 759 and 760:
FIGURE 17-1 Creating an app package
Page 761 and 762:
desktop applications and distribute
Page 763 and 764:
means is that if you want to promot
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You should also strongly consider m
Page 767 and 768:
• In-app purchases through the Wi
Page 769 and 770:
That said, WinRT provides for the f
Page 771 and 772:
When your app accesses CurrentAppSi
Page 773 and 774:
} }); 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
Page 795 and 796:
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
Page 807 and 808:
Note CSS files can contain string l
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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:
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