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Sidebar: WinJS.Namespace.define and WinJS.Class.define WinJS.Namespace.define provides a shortcut for the JavaScript namespace pattern. This helps to minimize pollution of the global namespace as each app-defined namespace is just a single object in the global namespace but can provide access to any number of other objects, functions, and so on. This is used extensively in WinJS and is recommended for apps as well, where you define everything you need in a module—that is, within a (function() { ... })() block—and then export selective variables or functions through a namespace. In short, use a namespace anytime you’re tempted to add any global objects or functions! The syntax: var ns = WinJS.Namespace.define(, ) where is a string (dots are OK) and is any object contained in { }’s. Also, WinJS.Namespace.- defineWithParent(, , ) defines one within the namespace. If you call WinJS.Namespace.define for the same multiple times, the are combined. Where collisions are concerned, the most recently added members win. For example: WinJS.Namespace.define("MyNamespace", { x: 10, y: 10 }); WinJS.Namespace.define("MyNamespace", { x: 20, z: 10 }); //MyNamespace == { x: 20, y: 10, z: 10} WinJS.Class.define is, for its part, a shortcut for the object pattern, defining a constructor so that objects can be instantiated with new. Syntax: var className = WinJS.Class.define(, , ) where is a function, is an object with the class’s properties and methods, and is an object with properties and methods that can be directly accessed via . (without using new). Variants: WinJS.Class.derive(, ...) creates a subclass (... is the same arg list as with define) using prototypal inheritance, and WinJS.Class.mix(, []) defines a class that combines the instance (and static) members of one or more other and initializes the object with . Finally, note that because class definitions just generate an object, WinJS.Class.define is typically used inside a module with the resulting object exported to the rest of the app as a namespace member. Then you can use new . anywhere in the app. 128
Sidebar: Helping Out IntelliSense In Windows Store apps you might encounter certain markup structures within code comments, often starting with a triple slash, ///. These are used by Visual Studio and Blend to provide rich IntelliSense within the code editors. You’ll see, for example, /// comments, which create a relationship between your current script file and other scripts to resolve externally defined functions and variables. This is explained on the JavaScript IntelliSense page in the documentation. For your own code, especially with namespaces and classes that you will use from other parts of your app, use these comment structures to describe your interfaces to IntelliSense. For details, see Extending JavaScript IntelliSense, and look around the WinJS JavaScript files for many examples. The Navigation Process and Navigation Styles Having seen how page controls, WinJS.UI.Pages, WinJS.Navigation, and the PageControlNavigator all relate, it’s straightforward to see how to navigate between multiple pages within the context of a single <strong>HTML</strong> page (e.g., default.html). With the PageControlNavigator instantiated and a page control defined via WinJS.UI.Pages, simply call WinJS.Navigation.navigate with the relative URI of that page control (its identifier). This loads that page and adds it to the DOM inside the element to which the PageControlNavigator is attached, unloading any previous page. This makes that page visible, thereby “navigating” to it so far as the user is concerned. You can also use the other methods of WinJS.- Navigation to move forward and back in the nav stack, with its canGoBack and canGoForward properties allowing you to enable/disable navigation controls. Just remember that all the while, you’ll still be in the overall context of your host page where you created the PageControlNavigator control. As an example, create a new project using the Grid App template and look at these particular areas: • pages/groupedItems/groupedItems is the home or “hub” page. It contains a ListView control (see Chapter 5) with a bunch of default items. • Tapping a group header in the list navigates to section page (pages/groupDetail). This is done in pages/groupedItems/groupedItems.html, where an inline onclick handler event navigates to pages/groupDetail/groupDetail.html with an argument identifying the specific group to display. That argument comes into the ready function of pages/groupDetail/groupDetail.js. • Tapping an item on the hub page goes to detail page (pages/itemDetail). The itemInvoked handler for the items, the _itemInvoked function in pages/groupedItems/groupedItem.js, calls WinJS.Navigation.navigate("/pages/itemDetail/itemDetail.html") with an argument identifying the specific item to display. As with groups, that argument comes into the ready function of pages/itemDetail/itemDetail.js. • Tapping an item in the section page also goes to the details page through the same mechanism—see the _itemInvoked function in pages/groupDetail/groupDetail.js. 129
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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
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 and 110: Of course, setPromise ultimately do
Page 111 and 112: previousExecutionState values are d
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: }, ); if (that.pageElement.winContr
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
Page 161 and 162: Custom Control Examples To see thes
Page 163 and 164: Between calendar.js and calendar.cs
Page 165 and 166: ]]> Whe
Page 167 and 168: This would be appropriate if you cr
Page 169 and 170: Two-way: essentially one-way bindin
Page 171 and 172: The code for this can be found in T
Page 173 and 174: Sidebar: Data-Binding Properties of
Page 175 and 176: Implementing Two-Way Binding To imp
Page 177 and 178: • 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
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To clarify the relationship between
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There is one subtle difference betw
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Within the web authentication broke
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https://www.facebook.com/dialog/oau
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Single Sign On with Live Connect Be
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setAccountPicturesAsync (for provid
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And lastly it’s worth at least li
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} var scenario1Link = document.getE
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} return currentFeed.items[currentI
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When data arrives, the handler rece
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} // This is a helper function echo
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On the client side, StreamSocket ag
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And closing the socket in Scenario
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In the sample, we first create a Me
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} try { var size = dataWriter.measu
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What We’ve Just Learned • Netwo
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• Connecting with devices in the
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The XInput and JavaScript controlle
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function renderLoop() { var state =
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FIGURE 15-3 Sample device enumerati
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The Removable Storage sample, in Sc
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• Communications are supported on
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Advertising a Connection Making you
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Tap to Connect and Tap to Activate
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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
Page 817 and 818:
If you like, you can just send your
Page 819 and 820:
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
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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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