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A GtkSpinButton is an ideal way to allow the user to set the value of some attribute. Rather than having to directly type a number into a GtkEntry, GtkSpinButton allows the user to click on one of two arrows to increment or decrement the displayed value. A value can still be typed in, with the bonus that it can be checked to ensure it is in a given range.
The main properties of a GtkSpinButton are through a GtkAdjustment. See the GtkAdjustment section for more details about an adjustment's properties.
Example 10. Using a GtkSpinButton to get an integer.
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/* Provides a function to retrieve an integer value from a GtkSpinButton * and creates a spin button to model percentage values. */ gint grab_int_value (GtkSpinButton *a_spinner, gpointer user_data) { return gtk_spin_button_get_value_as_int (a_spinner); } void create_integer_spin_button (void) { GtkWidget *window, *spinner; GtkAdjustment *spinner_adj; spinner_adj = (GtkAdjustment *) gtk_adjustment_new (50.0, 0.0, 100.0, 1.0, 5.0, 5.0); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_container_set_border_width (GTK_CONTAINER (window), 5); /* creates the spinner, with no decimal places */ spinner = gtk_spin_button_new (spinner_adj, 1.0, 0); gtk_container_add (GTK_CONTAINER (window), spinner); gtk_widget_show_all (window); return; } |
Example 11. Using a GtkSpinButton to get a floating point value.
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/* Provides a function to retrieve a floating point value from a * GtkSpinButton, and creates a high precision spin button. */ gfloat grab_int_value (GtkSpinButton *a_spinner, gpointer user_data) { return gtk_spin_button_get_value (a_spinner); } void create_floating_spin_button (void) { GtkWidget *window, *spinner; GtkAdjustment *spinner_adj; spinner_adj = (GtkAdjustment *) gtk_adjustment_new (2.500, 0.0, 5.0, 0.001, 0.1, 0.1); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_container_set_border_width (GTK_CONTAINER (window), 5); /* creates the spinner, with three decimal places */ spinner = gtk_spin_button_new (spinner_adj, 0.001, 3); gtk_container_add (GTK_CONTAINER (window), spinner); gtk_widget_show_all (window); return; } |