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When you insert a field in your document, you will see the contents of the field rather than the field code. But sometimes it is helpful to see the field code rather than its contents. To view the code for a single field, select the field and press Shift+F9. To show the codes for all the fields in the document, press Alt+F9. These hotkeys work as toggles. You may also want to apply shading to the fields in your document. This will help you distinguish them easily from the rest of your document. To do so, click Tools Options. Open the View tab. In the drop-down box labeled Field shading, select Never, Always, or When selected. Click OK. With shading enabled, fields will contain a pale gray border on the computer screen.

Now, when the user goes to run the hworld web application, the browser will cache the files and make them available even when the user is offline. The offline cache mechanism also provides an API that allows the developer to have explicit control of the application cache. The manifest file can contain three distinct sections indicating how different files should be handled: CACHE NETWORK FALLBACK CACHE is the default section and says that the files in this section should be downloaded and stored in the application cache when they are accessed for the first time. Files under the NETWORK section are explicitly not cached and must be accessed over the network. This is useful when the application developer requires server side interaction, such as for tracking mechanisms. All requests to resources under NETWORK bypass the cache and are requested directly from their online location. Finally, FALLBACK allows the developer to specify resources that should be used if the primary resource is not available. The first URI is the resource, the second is the fallback. Both URIs must be relative and from the same origin as the manifest file. This is useful for the developer to put up an explicit warning or error message if some expected resource is not available. A cache manifest with files in each section might look like this:

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Summary

Once an application is cached, the browser will update the cached files only under three conditions: 1. 2. 3. The user has cleared her cache and the cached content is therefore no longer available. The manifest file changed. The cache is explicitly updated via JavaScript using the application APIs.

AutoText is an easy way to speed up the creation of your documents. You can automatically insert predefined text in parts of your document.

Full details can be found from the W3C specification for application cache at http://dev.w3.org/html5/spec/offline.html. There is one last important point to keep in mind when using the HTML5 application cache. The application cache is by default disabled in QtWebKit, so you must explicitly enable it to use it. To do this, we need to set the appropriate property to true in the

This chapter gave you a firm foundation in OOP s most powerful features: inheritance and polymorphism. Being able to implement these features is fundamental to becoming a successful object-oriented programmer, regardless of the language you use. In the next chapter, you will take a closer look at how the objects in your applications collaborate. The topics covered include how objects pass messages to one another, how events drive your programs, how data is shared among instances of a class, and how exceptions are handled.

QWebSettings class. To do this in our fancy browser example, you need to add these lines of code to the application:

Word has a number of AutoText entries preinstalled that you can use. To access them, click Insert AutoText. On the submenu, you can select from a list of entries (see Figure 9-11). Click an entry, and Word automatically inserts it into your document.

QWebSettings *GlobalSettings = QWebSettings::globalSettings(); GlobalSettings-> setAttribute(QWebSettings::OfflineWebApplicationCacheEnabled, true);