MICROSOFT_PRESS_EBOOK_PROGRAMMING_WINDOWS_8_APPS_WITH_HTML_CSS_AND_JAVASCRIPT_PDF

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• The file picker is the way that users can select files from any safe location in the file system, as well as files that are provided by other apps (where those files might be remote, stored in a database, or otherwise not present as file entities on the local file system). The ability to select files directly from other apps—including files that another app might generate on demand—is one of the most convenient and powerful features of Windows Store apps. • StorageFolder objects provide a very rich and extensive capability to query and search its contents through file queries. These queries can be simple to complex and can employ Advanced Query Syntax (AQS) search strings. 362
Chapter 9 Input and Sensors Touch is clearly one of the most exciting means of interacting with a computer that has finally come of age. Sure, we’ve had touch-sensitive devices for many years: I remember working with a touch-enabled screen in my college days, which I have to admit is almost an embarrassingly long time ago now! In that case, the touch sensor was a series of transparent wires embedded in a plastic sheet over the screen, with an overall touch resolution of around 60 wide by 40 high…and, to really date myself, the monitor itself was only a text terminal! Fortunately, touch screens have progressed tremendously in recent years. They are responsive enough for general purpose use (that is, you don’t have to stab them to register a point), are built into high-resolution displays, are relatively inexpensive, and are capable of doing something more than replicating the mouse—namely, supporting multitouch and sophisticated gestures. Great touch interaction is thus now a fundamental feature of great apps, and designing for touch means in many ways thinking through UI concerns anew. In your layout, for example, it means making hit targets a size that’s suitable for a variety of fingers. In your content navigation, it means utilizing direct gestures such as swipes and pinches rather than relying on only item selection and navigation controls. Similarly, designing for touch means thinking though how gestures might enrich the user experience—and also how to provide for discoverability and user feedback that has generally relied on mouse-only events like hover. All in all, approach your design as if touch was the only means of interaction that your users might have. At the same time, it’s very important to remember that new methods of input seldom obsolete existing ones. Sure, punch cards did eventually disappear, but the introduction of the mouse did not obsolete keyboards. The availability of speech recognition or handwriting has obsoleted neither mouse nor keyboard. I think the same is true for touch: it’s really a complementary input method that has its own particular virtues but is unlikely to wholly supplant the others. As Bill Buxton of Microsoft Research has said, “Every modality, including touch, is best for something and worst for something else.” I expect, in time, we’ll see ourselves using keyboard, mouse, and touch together, just as we learned to integrate the mouse in what was once a keyboard-only reality. Windows is designed to work well with all forms of input—to work great with touch, to work great with mice, to work great with keyboards, and, well, to just work great on diverse hardware! (And Windows Store certification requires this for apps as well.) For this reason, Windows provides a unified pointer-based input model wherein you can differentiate the different inputs if you really need to but can otherwise treat them equally. You can also focus more on higher-level gestures as well, which can arise from any input source, and not worry about raw pointer events at all. Indeed, the very fact that we haven’t even brought this subject up until now, midway through this book, gives testimony to just how natural it is to work with all kinds of pointer input without having to think about it: the controls and 363
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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
Page 311 and 312: Chapter 8 State, Settings, Files, a
Page 313 and 314: while our permanent home was being
Page 315 and 316: • Account and profile configurati
Page 317 and 318: By the way, you might have some rea
Page 319 and 320: var localSettings = Windows.Storage
Page 321 and 322: It is also possible to migrate app
Page 323 and 324: Tip There are some file extensions
Page 325 and 326: Sidebar: Closing Streams vs. Closin
Page 327 and 328: Using App Data APIs for State Manag
Page 329 and 330: efore setting up new defaults. As m
Page 331 and 332: Roaming State The automatic roaming
Page 333 and 334: good idea to not be too aggressive
Page 335 and 336: Each app-supplied command can do on
Page 337 and 338: There are two ways to implement thi
Page 339 and 340: function helpCommandInvoked(e) { va
Page 341 and 342: Programmatically Invoking Settings
Page 343 and 344: Sidebar: Changes to Permissions A c
Page 345 and 346: Think about this for a moment (as I
Page 347 and 348: eturns an appropriate StorageFile o
Page 349 and 350: function pickSinglePhoto() { // Ver
Page 351 and 352: When picking multiple files, the re
Page 353 and 354: indicate a new filename in which to
Page 355 and 356: scenario oriented on the music libr
Page 357 and 358: A QueryOptions is generally created
Page 359 and 360: The setPropertyPrefetch method goes
Page 361: What We’ve Just Learned • State
Page 365 and 366: • Second, when you need to handle
Page 367 and 368: One or more fingers touch the scree
Page 369 and 370: You might notice a conspicuous abse
Page 371 and 372: Note that this method has no effect
Page 373 and 374: • TouchCapabilities Properties ar
Page 375 and 376: Tip Pointer events won’t fire if
Page 377 and 378: Properties Description currentPoint
Page 379 and 380: The first step to receiving gesture
Page 381 and 382: • MSGestureHold occurs when MSPoi
Page 383 and 384: FIGURE 9-3 A conceptual representat
Page 385 and 386: FIGURE 9-4 The Input Instantiable G
Page 387 and 388: obviously a specific deceleration m
Page 389 and 390: • Process keydown, keyup, and key
Page 391 and 392: For passwords you get a key to hide
Page 393 and 394: keyboard sample. 50 Adding listener
Page 395 and 396: Standard Keystrokes The last piece
Page 397 and 398: FIGURE 9-9 The Input Ink sample wit
Page 399 and 400: (string), and timestamp (Date) prop
Page 401 and 402: Like all other WinRT APIs, however,
Page 403 and 404: Here’s an example of such code fr
Page 405 and 406: Chapter 10 Media To say that media
Page 407 and 408: movie.controls = true; document.get
Page 409 and 410: declared inline, created dynamicall
Page 411 and 412: } 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
Page 583 and 584:
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
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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
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
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); "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
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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
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
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• 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
Page 751 and 752:
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
Page 765 and 766:
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
Page 777 and 778:
If you’re using a custom commerce
Page 779 and 780:
You might have noticed that a Produ
Page 781 and 782:
Id=\"e2a62d42-dbca-43d2-b779-66eb91
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The latter two we’ve already cove
Page 785 and 786:
• aria-label Directly provides te
Page 787 and 788:
Apart from the small bits of code i
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control sample, and switch between
Page 791 and 792:
Scenario 2 shows similar effects wi
Page 793 and 794:
Canvas a better choice? To this poi
Page 795 and 796:
one resource. For a few examples of
Page 797 and 798:
addition of new string and image re
Page 799 and 800:
FIGURE 17-9 Control panel dialogs f
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Formatting Culture-Specific Data an
Page 803 and 804:
Sorting and Grouping Just as a worl
Page 805 and 806:
With images, you can reverse them w
Page 807 and 808:
Note CSS files can contain string l
Page 809 and 810:
Manifest: Let’s turn now to the m
Page 811 and 812:
Other affected files in this app in
Page 813 and 814:
Sidebar: String Resources in Settin
Page 815 and 816:
the folder name itself doesn’t us
Page 817 and 818:
If you like, you can just send your
Page 819 and 820:
FIGURE 17-11 The Multilingual App T
Page 821 and 822:
Second, the Toolkit will detect if
Page 823 and 824:
Localization Wrap-Up Well, we’re
Page 825 and 826:
Let me say that again: all of this
Page 827 and 828:
Onboarding and Working through Reje
Page 829 and 830:
Connecting Your Website If you have
Page 831 and 832:
What We’ve Just Learned • An ap
Page 833:
What do you think of this book? We
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