the compiler failed with error code 128 asp.net Figure 8-3. Applying Cell Renderer Properties in Font

Paint DataMatrix in Font Figure 8-3. Applying Cell Renderer Properties

Figure 8-3. Applying Cell Renderer Properties
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In Figure 8-3, there are two tree model columns with the types G_TYPE_STRING and GDK_TYPE_COLOR. These are applied to GtkCellRendererText s text and foreground properties and used to render the tree view column accordingly. An additional way to change cell renderer properties is by defining a cell data function. This function will be called for every row in the tree view before it is rendered. This allows you to customize how every cell is rendered without the need for the data to be stored in a tree model. For example, a cell data function can be used to define how many decimal places of a floating point number to display. Cell data functions will be covered in detail in the Cell Data Functions section of this chapter. Later on, this chapter also covers cell renderers that are used to display text (strings, numbers, and Boolean values), toggle buttons, spin buttons, progress bars, pixbufs, combo boxes, and keyboard accelerators. In addition, you can create custom cell renderer types, but this is usually not needed, since GTK+ now provides such a wide variety of types. This section has taught you what objects are needed to use the GtkTreeView widget, what they do, and how they interrelate. Now that you have a basic understanding of the GtkTreeView widget, the next section will give a simple example using the GtkListStore tree model.
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Using GtkListStore
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Recall from the previous section that GtkTreeModel is simply an interface implemented by data stores such as GtkListStore. GtkListStore is used to create lists of data that have no hierarchical relationship among rows. In this section, a simple Grocery List application will be implemented that contains three columns, all of which use GtkCellRendererText. A screenshot of this application can be viewed in Figure 8-4. The first column is a gboolean value displaying TRUE or FALSE that defines whether or not the product should be purchased.
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Tip You usually do not want to display Boolean values as text, because if you have many Boolean columns, it will become unmanageable for the user. Instead, you will want to use toggle buttons. You will learn how to do this with GtkCellRendererToggle in a later section. Boolean values are often also used as column attributes in order to define cell renderer properties.
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The second column displays the quantity of the product to buy as an integer and the third a text string describing the product. All of the columns use GtkCellRendererText for rendering; GtkCellRendererText is a cell renderer capable of displaying Boolean values and various number formats (int, double, and float) as text strings.
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Figure 8-4. A tree view widget using a GtkListStore tree model Listing 8-1 creates a GtkListStore object, which displays a list of groceries. In addition to displaying the products, the list store also displays whether to buy the product and how many of them to buy. This Grocery List application will be used for many examples throughout the rest of the chapter. Therefore, the content of some functions may be excluded later on if it is presented in previous examples. Also, to keep things organized, in every example setup_tree_view() will be used to set up columns and renderers. Full code listings for every example can be downloaded at www.gtkbook.com. Listing 8-1. Creating a GtkTreeView (liststore.c) #include <gtk/gtk.h> enum { BUY_IT = 0, QUANTITY, PRODUCT, COLUMNS }; typedef struct { gboolean buy; gint quantity; gchar *product; } GroceryItem;
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const GroceryItem list[] = { { TRUE, 1, "Paper Towels" }, { TRUE, 2, "Bread" }, { FALSE, 1, "Butter" }, { TRUE, 1, "Milk" }, { FALSE, 3, "Chips" }, { TRUE, 4, "Soda" }, { FALSE, 0, NULL } }; static void setup_tree_view (GtkWidget*); int main (int argc, char *argv[]) { GtkWidget *window, *treeview, *scrolled_win; GtkListStore *store; GtkTreeIter iter; guint i = 0; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Grocery List"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 250, 175); treeview = gtk_tree_view_new (); setup_tree_view (treeview); /* Create a new tree model with three columns, as string, gint and guint. */ store = gtk_list_store_new (COLUMNS, G_TYPE_BOOLEAN, G_TYPE_INT, G_TYPE_STRING); /* Add all of the products to the GtkListStore. */ while (list[i].product != NULL) { gtk_list_store_append (store, &iter); gtk_list_store_set (store, &iter, BUY_IT, list[i].buy, QUANTITY, list[i].quantity, PRODUCT, list[i].product, -1); i++; }
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