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GtkCellRenderer objects. Each GtkCellRenderer uses different attributes. GtkCellRendererText, for instance, uses "text" or "markup", while GtkCellRendererProgress uses "text" and "value". To create a GtkTreeViewColumn and set all its attributes, call column = gtk_tree_view_column_new_with_attributes("Active", rend, "active", ACTIVE_COLUMN, NULL); This uses another NULL-terminated list of pairs as arguments. These represent the attribute used by the renderer, and the column of the GtkTreeModel from which to get that value. After creating the column, add it to your GtkTreeView: gtk_tree_view_append_column(GTK_TREE_VIEW(tree_view), column); GtkTreeView and its assorted GtkCellRenderer objects emit signals related to the user s interaction with the UI. GtkTreeView emits signals when a row gets double-clicked ("row-activated"), or when a row in a tree gets expanded or collapsed, revealing or hiding its children respectively ("row-expanded" and "row-collapsed"). Signals specific to certain GtkCellRenderer objects are emitted by those objects accordingly. GtkCellRendererToggle emits a "toggled" signal when the check box is clicked and GtkCellRendererText emits an "edited" signal when the user edits the text contained in it. The callbacks for these signals will be given the path to the affected row as a string, which you can convert to a GtkTreePath with gtk_tree_path_new_from_string().

Secure Sockets Layer (SSL) is a method of encrypting transactions and data over a network. Securing transactional data is often a requirement when said transactions contain sensitive data or information, such as credit card data.

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The currently selected row in the GtkTreeView is represented in the GtkTreeSelection object. To get the currently selected row, call GtkTreeSelection *selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(tree_view)); Then, to get the GtkTreeIter this represents, call gtk_tree_selection_get_selected(selection, &model, &iter); Note that this function takes a GtkTreeModel** (a pointer to a pointer to a GtkTreeModel). This means that the function wants to edit the value of model. In this case, gtk_tree_selection_ get_selected() will set model to point to the GtkTreeModel this GtkTreeSelection is part of. Assuming you already know this (or don t need to know this), you can pass this argument as NULL. Once you have a GtkTreeIter, you can read values from it as discussed earlier. GtkTreeSelection also has one noteworthy signal, "changed", which is emitted whenever the selected row changes it. Get the GtkTreeSelection from the GtkTreeView with gtk_tree_view_ get_selection() and connect to its "changed" signal. When the callback is called, you can find out which row is currently selected.

Figure 2-2. The default site object created by Django You ll notice that the main admin page displays an Add link and a Change link next to each type of item (see Figure 2-1). Add a new flat page by clicking the Add link next to the Flat Pages link. This will bring up a blank form, automatically generated from the appropriate data model. Enter the following values:

It turns out that GtkTreeModel is a useful data structure for many applications, and GtkCellRenderer is a very useful way of modularly displaying data. As such, alternate views and controllers to GtkTreeModel s model have been developed. GtkComboBox is one of them.

If encryption is required, it may be implemented with Oracle Applications. SSL may be implemented for the Oracle HTTP Server, Forms Server, and Database Server. SSL may be implemented with software or with a hardware device known as an SSL accelerator. Details for implementing SSL are given in MetaLink Note 123718.1.

GtkComboBox shows a drop-down list of possible choices for the user It uses the GtkTreeModel to represent the data shown, and employs GtkCellRender objects to draw it Creating a GtkTreeModel for a GtkComboBox is exactly like creating one for a GtkTreeView Similarly, it will emit the same signals and have the same properties Creating a GtkComboBox is much like creating a GtkTreeView Create a GtkComboBox with gtk_combo_box_new_with_model(), using the GtkTreeModel you ve already created GtkComboBox uses GtkCellLayout, which uses GtkCellRenderer objects to draw cells, as GtkTreeView does Adding GtkCellRenderer objects with GtkCellLayout is very similar to adding columns to a GtkTreeView: GtkCellRenderer *rend = gtk_cell_renderer_text_new(); gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(combo_box), rend, TRUE); gtk_cell_layout_set_attributes(GTK_CELL_LAYOUT(combo_box), rend, "text", TEXT_COLUMN, NULL); The list of attribute pairs works just like in GtkTreeView The final gboolean argument of gtk_cell_layout_pack_start() is the "expand" argument, which works just like it does in the various layout containers.

In the URL field, enter /first-page/. In the Title field, enter My first page. In the Content field, enter This is my first Django flat page.

This interface works very well for complex GtkComboBox objects, but for the most common case (a combo box containing only text), GtkComboBox offers some convenience functions To create a GtkComboBox containing only text, call gtk_combo_box_new_text() This function will create a GtkTreeModel with a single column of text and add it to the GtkComboBox To add new text items to the combo box, use gtk_combo_box_append_text(), gtk_combo_box_prepend_ text(), or gtk_combo_box_insert_text(), depending on where in the GtkComboBox the new item should appear Regardless of how you create your GtkComboBox, you ll use it in the same manner The GtkComboBox will emit a "changed" signal when the active item in the GtkComboBox changes.

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