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In listing 14.13, we first check to see if our Session object contains any keys B. If so, we register a blank prefix to match C. Next, we loop through every key in our Session D,

Note The downloadable exercise solution includes only very basic functionality of a text editor. It is meant to get you started if you are having trouble. However, you are encouraged to continue to expand your text editor implementation beyond the provided solution!

nothing that the authors of mywwwservice.com can do to prevent hackerhome.org from linking to their site. Similarly, suppose the page from www.hackerhome.org contains the following HTML fragment: <iframe style="display: none" src="http://www.mywwwservice.com/some_url"></iframe> Rather than replacing the current window with the document loaded from www. mywwwservice.com, as in the first example in this section, here the browser loads the document into an embedded document frame. In addition, this happens automatically without user interaction and the style attribute instructs the browser to not visibly render the frame; that is, the user would have no visual indication that his browser just loaded this page.

adding each key as an available prefix to match to our _prefixes collection E. After that, we pull every value out of Session, creating a new ValueProviderResult object F for each key-value pair found in Session. Each ValueProviderResult is then added to our local _values dictionary. Because we figure out every possible prefix and value provider result when our SessionValueProvider is instantiated, implementing the other two required IValueProvider methods becomes straightforward, as shown in listing 14.14.

There are a number of callback functions implemented for the text editor. These are the ability to create a new file; open an existing file; save the file; cut, copy, and paste selected text; and search for text in the document. To create a new document, you should first ask the user whether or not the application should continue with a GtkMessageDialog widget. If the user chooses to continue, the downloadable exercise solution simply clears the GtkTextBuffer object and destroys the dialog. Otherwise, the dialog is just destroyed. Opening a document in the provided solution does not ask the user for confirmation, since it is easy to cancel the operation from the GtkFileChooserDialog widget. The file chooser dialog

public bool ContainsPrefix(string prefix) { return _prefixes.Contains(prefix); } public ValueProviderResult GetValue(string key) { ValueProviderResult result; _values.TryGetValue(key, out result); return result; }

has an action type of GTK_FILE_CHOOSER_ACTION_OPEN. When a file is selected, its contents are read with g_file_get_contents() and written into the text buffer. Saving in the exercise solution asks for a new file name every time the button is pressed. It calls g_file_set_contents() to save the text to the selected file. The clipboard functions are similar to those provided in 7 s clipboard example. It uses the built-in text buffer functions for cut, copy, and paste actions. These actions are performed on the default clipboard, GDK_SELECTION_CLIPBOARD. The last callback function searches the current text for a case-sensitive string. The solution used is similar to the function shown in Listing 7-6 in 7, so you should refer to its description for more information.

In the previous section s example, documents were loaded into the main browser window, or into a frame. In these cases, the browser s enforcement of the same-origin policy prevents JavaScript on the document loaded from hackerhome.org to peek inside the document loaded from mywwwservice.com, even though in the second example, the frame containing the mywwwservice.com document is actually embedded in a page from hackerhome.org. However, there are a few situations in which data loaded from a URL in one domain is essentially considered to have originated from another domain for purposes of the sameorigin policy. For example, if a page at www.hackerhome.org contains the HTML fragment <script src="http://www.mywwwservice.com/some_url"></script> the URL is loaded from www.mywwwservice.com, parsed as JavaScript, and then evaluated in the context of the enclosing page. That is, for purposes of the same-origin policy, the script is considered to have originated from www.hackerhome.org and not www.mywwwservice.com, even though the latter is the domain name of the server from which the data was fetched! In particular, the included script can inspect the contents and attributes of the enclosing page, and conversely, the page can define the evaluation environment for the script being included.