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gdk_pixbuf_loader_write(GdkPixbufLoader *loader, const guchar *buf, gsize count, GError *error); buf points to the new data to add, and count is the number of new bytes in buf. As soon as GdkPixbufLoader has received enough data about the image to know its format and dimensions, it will create an empty GdkPixbuf with those specifications. As it receives more data about the image, it will begin to fill in the pixels of that GdkPixbuf. You can access this GdkPixbuf with gdk_pixbuf_loader_get_pixbuf(). Even though the data may not have loaded, you can still have a perfectly valid GdkPixbuf. Some of it, however, will be empty (again, think of how a Web browser loads an image). If you are presenting this GdkPixbuf to the user as it loads, you will want to connect to a few signals emitted by the GdkPixbufLoader. The first signal you should connect to is "area-prepared". This signal is emitted when the GdkPixbuf object has been created with the appropriate size. When creation of the GdkPixbuf object invokes your callback, you can call gdk_pixbuf_loader_get_pixbuf() and present the empty GdkPixbuf object to the user. The next important signal is "area-updated". This signal is emitted when more data has been added to the GdkPixbuf. You should connect to this when you need to redraw the image presented by a GdkPixbuf. The final signal you may want to connect to is "closed". "closed" is emitted when the GdkPixbufLoader has been closed and no more data will be written to the GdkPixbuf. This signal will be emitted only after you manually call gdk_pixbuf_close(), as the GdkPixbufLoader has no other way to know when there is no more data.

GdkPixbuf also provides a way to work with animations. These animations, usually coming from a GIF file, consist of a series of frames. GdkPixbuf obscures most of the implementation; all it requires is that you ask it to return the GdkPixbuf that should represent the animation when the frame changes. To create a new animation from a GIF file (or any other file that supports animation), call GdkPixbufAnimation *anim = gdk_pixbuf_animation_from_file_new(const char *filename, GError **error); It should be noted that GdkPixbufAnimation will treat a nonanimated image as an animation with only one frame. If you don t know in advance whether the image is animated or not, GdkPixbufAnimation can be used identically, regardless. When you want to start showing the image, you ll need to get a GdkPixbufAnimationIter object representing the current frame of an animation. To get this, call GdkPixbufAnimationIter *iter = gdk_pixbuf_animation_get_iter(GdkPixbuf *pixbuf, const GTimeVal *start_time); The start_time argument is the time the animation begins, represented as a GTimeVal struct. Because this time is most likely now, you can set this as NULL, which GdkPixbufAnimation will consider now. Immediately after creating an iterator, the animation begins. To get the first frame of animation, call gdk_pixbuf_animation_iter_get_pixbuf() on it. Then call gdk_pixbuf_ animation_iter_get_delay_time() which returns the amount of time this frame should be shown for. Use g_timeout_add() (see last chapter) to attach a callback triggered after this

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Of course, simply changing the form class might not help very much, because the view will always use the same template contact_form.html to render it. But once again, you can make a small change to the view and add some flexibility to the template handling. In this case, you can directly emulate Django s generic views, which all accept an argument called template_name to override the default template they d use: def contact_form(request, form_class=ContactForm, template_name='contact_form.html'): if request.method == 'POST': form = form_class(data=request.POST) if form.is_valid(): form.save() return HttpResponseRedirect("/contact/sent/") else: form = form_class() return render_to_response(template_name, { 'form': form }, context_instance=RequestContext(request)) Then you can change the URL pattern to specify a different template:

DBA_ADVISOR_FINDINGS DBA_ADVISOR_LOG DBA_ADVISOR_RATIONALE DBA_ADVISOR_RECOMMENDATIONS DBA_ADVISOR_TASKS

Note A bitmask is often used to consolidate multiple Boolean options into a single variable. Each option is designated a bit, usually by defining a constant as a power of two. These bits are then manipulated using the bitwise operators mostly & and |. To set GTK_EXPAND and GTK_FILL, one would use "GTK_EXPAND | GTK_FILL". When the called function needs to check if GTK_FILL is checked, it will check if "xoptions & GTK_FILL" does not equal zero.

url(r'^inquiries/sales/$', contact_form, { 'form_class': SalesInquiryForm, 'template_name': 'sales_inquiry.html' }, name='sales_inquiry_form'), Being able to change both the form that the view uses and the template it uses to display that form gives you a huge amount of flexibility for reusing this view. Now you can easily set up multiple forms and customize the templates for each one with any specific presentation or instructions you want to add.

Some widgets are too large to reasonably fit in a window without scrollbars that allow the user to choose only part of the widget to view at a time. To provide scrollbar functionality, add these widgets to a GtkScrolledWindow, shown in Figure 5-15.

Information on the findings of ADDM Information on the current state of all tasks in the database Information on the rationale for all recommendations by ADDM Information on the recommendations for all diagnostic tasks Information on the existing tasks in the database

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