GtkSpinButton
retrieve an integer or floating-point number from the user.
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.
Using a <structname>GtkSpinButton</structname> to get an integer.
/* 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;
}
Using a <structname>GtkSpinButton</structname> to get a floating point value.
/* 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_as_float (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;
}
#GtkEntry
retrieve text rather than numbers.
entry is the #GtkEntry part of the #GtkSpinButton
widget, and can be used accordingly. All other fields contain private data
and should only be modified using the functions below.
GTK_UPDATE_ALWAYS
When refreshing your #GtkSpinButton, the value is always displayed.
GTK_UPDATE_IF_VALID
When refreshing your #GtkSpinButton, the value is only displayed if it is valid within the bounds of the spin button's #GtkAdjustment.
@GTK_UPDATE_ALWAYS:
@GTK_UPDATE_IF_VALID:
GTK_SPIN_STEP_FORWARD,
GTK_SPIN_STEP_BACKWARD,
GTK_SPIN_PAGE_FORWARD,
GTK_SPIN_PAGE_BACKWARD
These values spin a #GtkSpinButton by the relevant values of the spin button's #GtkAdjustment.
GTK_SPIN_HOME,
GTK_SPIN_END
These set the spin button's value to the minimum or maxmimum possible values, (set by it's #GtkAdjustment), respectively.
GTK_SPIN_USER_DEFINED
The programmer must specify the exact amount to spin the #GtkSpinButton.
@GTK_SPIN_STEP_FORWARD:
@GTK_SPIN_STEP_BACKWARD:
@GTK_SPIN_PAGE_FORWARD:
@GTK_SPIN_PAGE_BACKWARD:
@GTK_SPIN_HOME:
@GTK_SPIN_END:
@GTK_SPIN_USER_DEFINED:
Changes the properties of an existing spin button. The adjustment, climb rate, and number of decimal places are all changed accordingly, after this function call.
@spin_button: a #GtkSpinButton.
@adjustment: a #GtkAdjustment.
@climb_rate: the new climb rate.
@digits: the number of decimal places to display in the spin button.
Creates a new #GtkSpinButton.
@adjustment: the #GtkAdjustment object that this spin button should use.
@climb_rate: specifies how much the spin button changes when an arrow is clicked on.
@digits: the number of decimal places to display.
@Returns: The new spin button as a #GtkWidget.
@min:
@max:
@step:
@Returns:
@spin_button:
@adjustment:
@spin_button:
@Returns:
@spin_button:
@digits:
@spin_button:
@step:
@page:
@spin_button:
@min:
@max:
Gets the value in the @spin_button. This function is deprecated,
use gtk_spin_button_get_value() instead.
@Returns: the value of @spin_button.
@spin_button: a #GtkSpinButton.
@spin_button:
@Returns:
@spin_button:
@value:
@spin_button:
@policy:
@spin_button:
@numeric:
@spin_button:
@direction:
@increment:
@spin_button:
@wrap:
@spin_button:
@snap_to_ticks:
@spin_button:
@spin_button:
@Returns:
@spin_button:
@step:
@page:
@spin_button:
@Returns:
@spin_button:
@min:
@max:
@spin_button:
@Returns:
@spin_button:
@Returns:
@spin_button:
@Returns:
@spin_button:
@Returns:
@spinbutton: the object which received the signal.
@arg1:
@Returns:
@spinbutton: the object which received the signal.
@Returns:
@spinbutton: the object which received the signal.
the #GtkAdjustment that defines a spin button's main properties.
the amount a spin button changes when an arrow is clicked.
the number of decimal places to display.
whether erroneous values are automatically changed to a spin button's nearest step increment.
whether non-numeric characters should be ignored.
whether a spin button should wrap upon reaching its limits.
how a spin button should be updated.
reads the current value, or sets a new value.