gtk2/docs/reference/gtk/tmpl/gtkspinbutton.sgml

<!-- ##### SECTION Title ##### -->
GtkSpinButton

<!-- ##### SECTION Short_Description ##### -->
retrieve an integer or floating-point number from the user.

<!-- ##### SECTION Long_Description ##### -->
<para>
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.
</para>
<para>
The main properties of a #GtkSpinButton are through a #GtkAdjustment. See the #GtkAdjustment section for more details about an adjustment's properties.
</para>
<para>
<example>
<title>Using a GtkSpinButton to get an integer.</title>
<programlisting>

/* 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;
}

</programlisting>
</example>
</para>

<para>
<example>
<title>Using a GtkSpinButton to get a floating point value.</title>
<programlisting>

/* 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;
}

</programlisting>
</example>
</para>

<!-- ##### SECTION See_Also ##### -->
<para>
<variablelist>
<varlistentry>
<term>#GtkEntry</term>
<listitem><para>retrieve text rather than numbers.</para></listitem>
</varlistentry>
</variablelist>
</para>

<!-- ##### STRUCT GtkSpinButton ##### -->
<para>
<structfield>entry</structfield> 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.
</para>


<!-- ##### ENUM GtkSpinButtonUpdatePolicy ##### -->
<para>

<informaltable pgwide=1 frame="none" role="enum">
<tgroup cols="2"><colspec colwidth="2*"><colspec colwidth="8*">
<tbody>
<row>
<entry>GTK_UPDATE_ALWAYS</entry>
<entry>When refreshing your #GtkSpinButton, the value is always displayed.</entry>
</row>
<row>
<entry>GTK_UPDATE_IF_VALID</entry>
<entry>When refreshing your #GtkSpinButton, the value is only displayed if it is valid within the bounds of the spin button's #GtkAdjustment.</entry>
</row>
</tbody></tgroup></informaltable>
</para>

@GTK_UPDATE_ALWAYS: 
@GTK_UPDATE_IF_VALID: 

<!-- ##### ENUM GtkSpinType ##### -->
<para>

<informaltable pgwide=1 frame="none" role="struct">
<tgroup cols="2"><colspec colwidth="2*"><colspec colwidth="8*">
<tbody>
<row>
<entry>GTK_SPIN_STEP_FORWARD, 
GTK_SPIN_STEP_BACKWARD, 
GTK_SPIN_PAGE_FORWARD, 
GTK_SPIN_PAGE_BACKWARD</entry>
<entry>These values spin a #GtkSpinButton by the relevant values of the spin button's #GtkAdjustment.</entry>
</row>
<row>
<entry>GTK_SPIN_HOME, 
GTK_SPIN_END</entry>
<entry>These set the spin button's value to the minimum or maxmimum possible values, (set by it's #GtkAdjustment), respectively.</entry>
</row>
<row>
<entry>GTK_SPIN_USER_DEFINED</entry>
<entry>The programmer must specify the exact amount to spin the #GtkSpinButton.</entry>
</row>
</tbody></tgroup></informaltable>
</para>

@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: 

<!-- ##### FUNCTION gtk_spin_button_configure ##### -->
<para>
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.
</para>

@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.


<!-- ##### FUNCTION gtk_spin_button_new ##### -->
<para>
Creates a new #GtkSpinButton.
</para>

@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: a #GtkWidget.


<!-- ##### FUNCTION gtk_spin_button_set_adjustment ##### -->
<para>

</para>

@spin_button: 
@adjustment: 


<!-- ##### FUNCTION gtk_spin_button_get_adjustment ##### -->
<para>

</para>

@spin_button: 
@Returns: 


<!-- ##### FUNCTION gtk_spin_button_set_digits ##### -->
<para>

</para>

@spin_button: 
@digits: 


<!-- ##### FUNCTION gtk_spin_button_get_value_as_float ##### -->
<para>

</para>

@spin_button: 
@Returns: 


<!-- ##### FUNCTION gtk_spin_button_get_value_as_int ##### -->
<para>

</para>

@spin_button: 
@Returns: 


<!-- ##### FUNCTION gtk_spin_button_set_value ##### -->
<para>

</para>

@spin_button: 
@value: 


<!-- ##### FUNCTION gtk_spin_button_set_update_policy ##### -->
<para>

</para>

@spin_button: 
@policy: 


<!-- ##### FUNCTION gtk_spin_button_set_numeric ##### -->
<para>

</para>

@spin_button: 
@numeric: 


<!-- ##### FUNCTION gtk_spin_button_spin ##### -->
<para>

</para>

@spin_button: 
@direction: 
@increment: 


<!-- ##### FUNCTION gtk_spin_button_set_wrap ##### -->
<para>

</para>

@spin_button: 
@wrap: 


<!-- ##### FUNCTION gtk_spin_button_set_snap_to_ticks ##### -->
<para>

</para>

@spin_button: 
@snap_to_ticks: 


<!-- ##### FUNCTION gtk_spin_button_update ##### -->
<para>

</para>

@spin_button: 


<!-- ##### MACRO GTK_INPUT_ERROR ##### -->
<para>

</para>



<!-- ##### SIGNAL GtkSpinButton::input ##### -->
<para>

</para>

@spinbutton: the object which received the signal.
@arg1: 
@Returns: 

<!-- ##### SIGNAL GtkSpinButton::output ##### -->
<para>

</para>

@spinbutton: the object which received the signal.
@Returns: 

<!-- ##### SIGNAL GtkSpinButton::value-changed ##### -->
<para>

</para>

@spinbutton: the object which received the signal.

<!-- ##### ARG GtkSpinButton:adjustment ##### -->
<para>
the #GtkAdjustment that defines a spin button's main properties.
</para>

<!-- ##### ARG GtkSpinButton:climb-rate ##### -->
<para>
the amount a spin button changes when an arrow is clicked.
</para>

<!-- ##### ARG GtkSpinButton:digits ##### -->
<para>
the number of decimal places to display.
</para>

<!-- ##### ARG GtkSpinButton:snap-to-ticks ##### -->
<para>
whether erroneous values are automatically changed to a spin button's nearest step increment.
</para>

<!-- ##### ARG GtkSpinButton:numeric ##### -->
<para>
whether non-numeric characters should be ignored.
</para>

<!-- ##### ARG GtkSpinButton:wrap ##### -->
<para>
whether a spin button should wrap upon reaching its limits.
</para>

<!-- ##### ARG GtkSpinButton:update-policy ##### -->
<para>
how a spin button should be updated.
</para>

<!-- ##### ARG GtkSpinButton:value ##### -->
<para>
reads the current value, or sets a new value.
</para>