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Only two moderately tricky things are going on here: You re going to expect this view to be accessed with a query string like rating=1 or rating=-1, so you verify that this string is present and that it has an acceptable value. If not, you simply redirect back to the snippet. To prevent ballot stuffing by a user trying to rate the same snippet over and over, you ensure that the view simply changes the value of an existing rating if one is found.

GdkPixbuf is used to manipulate images. It can read and write image files in an assortment of common graphics formats including .jpeg, .gif, .png, .bmp, and .ico. It offers simple editing functions such as scaling, overlaying, and desaturating. It also allows direct access to the image data, allowing you to directly edit it however you please. GdkPixbuf is most commonly used to load images for icons, but can be used wherever images need to be loaded, manipulated, or saved. In Gaim, this includes buddy icons and IM images.

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Pango is a library used for rendering Unicode text in any language. It represents blocks of text in UTF-8, a text encoding to be discussed in 10. The developer can then apply various attributes to different portions of this text. These include color, size, weight (such as boldness), font family, background color, style (underlining for instance), and numerous other attributes (see Figure 5-3). Pango will then format the text according to your specification, taking into account various issues of internationalization and typesetting.

Setting up the URL for this view should be fairly easy. You can simply add a cab/urls/ ratings.py file and set up the necessary URL pattern: from django.conf.urls.defaults import * from cab.views.ratings import rate urlpatterns = patterns('', url(r'^( P<snippet_id>\d+)$', rate, name='cab_snippet_rate'), )

Performance issues may occur on any of the tiers, infrastructure, or modules that make up the Oracle Applications environment. Because of the complexity of the application, it is necessary to gather information from the user community to determine which component of the application is experiencing the degradation in performance. This section provides you with a method for identifying and documenting performance issues and their resolution. The first phase is to identify the cause of the degradation by collecting information to help you understand the underlying issue. The second phase is to develop an action plan in order to provide resolution.

Figure 5-3. Because of Pango, Gaim can render text in any language in a variety of different styles. Application developers using GTK+ rarely need to use Pango calls directly; most of its relevant functionality is wrapped within the various GTK+ widgets that use it. This includes the use of the Pango Markup Language. Pango Markup Language is an XML-based markup language used for assigning text attributes to certain ranges within a string. These ranges are called spans, and the attributes are set as XML attributes of those spans. For example, <span weight="bold">This text</span> is bold. would render as This text is bold.

Go ahead and add an {% if_rated %} template tag that resembles the {% if_bookmarked %} tag you developed earlier in this chapter. The compilation function for it should look familiar (once again, this goes into cab/templatetags/snippets.py): def do_if_rated(parser, token): bits = token.contents.split() if len(bits) != 3: raise template.TemplateSyntaxError("%s tag takes two arguments" % bits[0]) nodelist_true = parser.parse(('else', 'endif_rated')) token = parser.next_token() if token.contents == 'else': nodelist_false = parser.parse(('endif_rated',)) parser.delete_first_token() else: nodelist_false = template.NodeList() return IfRatedNode(bits[1], bits[2], nodelist_true, nodelist_false) Once again, you use the ability to parse ahead in the template to work out the structure of the if/else possibilities for the tag and store a pair of NodeList instances to pass as arguments to the Node class, which you can call IfRatedNode. First, you need to change the import statement at the top of the file from from cab.models import Bookmark to from cab.models import Bookmark, Rating Then you can write the IfRatedNode class:

To allow the most common attributes to be set more easily, convenience tags are provided. These convenience tags provide a syntax very similar to HTML for most purposes. Thus, the above example can also be specified as <b>This text</b> is bold. A complete specification of Pango Markup Language can be found at http://developer. gnome.org/doc/API/2.0/pango/PangoMarkupFormat.html.

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