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Note You will be able to specify which columns will appear in the GtkTreeView, which order they ll appear in, and how they ll be presented. GtkTreeModel is just a data structure. Therefore, you can add other columns to the model to store auxiliary data that won t appear in the GtkTreeView but are useful anyway. Gaim s buddy list stores pointers to the GaimBlistNode corresponding to each row in its GtkTreeStore.

GtkTreeModel emits signals when its contents change: "row-changed" is emitted whenever the value in a row changes in any way. "row-inserted" is emitted only when a row is inserted into the model. "row-deleted" is emitted only when a row is deleted from the model. "row-reordered" is emitted when a row is moved. Like GtkTextBuffer, GtkTreeModel uses iterators to access and manipulate specific rows in the tree. These iterators are implemented by GtkTreeIter, and are used with any operation that refers to a specific row in the tree, such as adding, deleting, or modifying rows.

note Python comments are lines that begin with the character # and that don t execute as code. They

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Some of the key areas where client systems may encounter resource constraints are memory and CPU usage, and data on this usage can be obtained for the client using Windows Task Manager. Pressing the Ctrl, Alt, and Del keys simultaneously will initiate the Windows Task Manager. Select the Performance tab to display CPU Usage and Memory Usage charts, as shown in Figure 4-9.

A GtkTreeIter represents a row in the list or tree. Like GtkTextIter, it is invalidated when the contents of the tree change and is usually declared on the stack. To add a new row to the end of a list, call GtkTreeIter iter; gtk_list_store_append(list_store, &iter); Appending a new row to a GtkTreeStore is similar: GtkTreeIter iter; gtk_tree_store_append(list_store, &iter, &parent); The extra argument, parent, allows you to specify which branch of the tree to append to. If left NULL, it will be appended to the top level. Now that you have a row, you can assign values to it.

either provide information to a person reading the file or point to code that has been temporarily disabled. (The author might have disabled the code because some feature needed to be turned off momentarily or because a bug needed to be tracked down.)

Do this using gtk_list_store_set() (or gtk_tree_store_set(); the syntaxes are identical). gtk_list_store_set() takes the GtkListStore, the GtkTreeIter pointing to your new row and, like gtk_tree_buffer_create_tag(), a NULL-terminated list of pairs. Each pair comprises the index of the row (which I ve already enumerated) and its value: gtk_list_store_set(list_store, &iter, ACTIVE_COLUMN, TRUE, ICON_COLUMN, pixbuf, TEXT_COLUMN, "This is text", NULL); You can repeat this operation for all the data you need to enter. When you need to read this data out of the GtkListStore object, use gtk_tree_model_get(). This function takes a model, a GtkTreeIter representing a row, and a NULL-terminated list of pairs of columns to retrieve the values from and pointers to put them in: gboolean active; GdkPixbuf *pixbuf; char *string; gtk_tree_model_get(list_store, &iter, ACTIVE_COLUMN, &active, ICON_COLUMN, &pixbuf, TEXT_COLUMN, &string, NULL); Notice the example passes pointers to the variables declared. That allows gtk_tree_model_ get() to change their values.

Figure 4-9. The Performance tab of Windows Task Manager If either chart shows excessive usage, select the Processes tab to view running processes. This display can be sorted by the CPU or Mem Usage columns in order to identify resource-intensive processes. For example, this investigation could show a virus scanning utility consuming high amounts of CPU that results in client-level performance problems running Oracle Application Forms.

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