GtkSpinButton

## GtkSpinButton GtkSpinButton — Retrieve an integer or floating-point number from the user |

## Synopsis

    #include <gtk/gtk.h>

    struct              GtkSpinButton;
    enum                GtkSpinButtonUpdatePolicy;
    enum                GtkSpinType;
    void                gtk_spin_button_configure           (GtkSpinButton *spin_button,
                                                             GtkAdjustment *adjustment,
                                                             gdouble climb_rate,
                                                             guint digits);
    GtkWidget *         gtk_spin_button_new                 (GtkAdjustment *adjustment,
                                                             gdouble climb_rate,
                                                             guint digits);
    GtkWidget *         gtk_spin_button_new_with_range      (gdouble min,
                                                             gdouble max,
                                                             gdouble step);
    void                gtk_spin_button_set_adjustment      (GtkSpinButton *spin_button,
                                                             GtkAdjustment *adjustment);
    GtkAdjustment *     gtk_spin_button_get_adjustment      (GtkSpinButton *spin_button);
    void                gtk_spin_button_set_digits          (GtkSpinButton *spin_button,
                                                             guint digits);
    void                gtk_spin_button_set_increments      (GtkSpinButton *spin_button,
                                                             gdouble step,
                                                             gdouble page);
    void                gtk_spin_button_set_range           (GtkSpinButton *spin_button,
                                                             gdouble min,
                                                             gdouble max);
    gint                gtk_spin_button_get_value_as_int    (GtkSpinButton *spin_button);
    void                gtk_spin_button_set_value           (GtkSpinButton *spin_button,
                                                             gdouble value);
    void                gtk_spin_button_set_update_policy   (GtkSpinButton *spin_button,
                                                             GtkSpinButtonUpdatePolicy policy);
    void                gtk_spin_button_set_numeric         (GtkSpinButton *spin_button,
                                                             gboolean numeric);
    void                gtk_spin_button_spin                (GtkSpinButton *spin_button,
                                                             GtkSpinType direction,
                                                             gdouble increment);
    void                gtk_spin_button_set_wrap            (GtkSpinButton *spin_button,
                                                             gboolean wrap);
    void                gtk_spin_button_set_snap_to_ticks   (GtkSpinButton *spin_button,
                                                             gboolean snap_to_ticks);
    void                gtk_spin_button_update              (GtkSpinButton *spin_button);
    guint               gtk_spin_button_get_digits          (GtkSpinButton *spin_button);
    void                gtk_spin_button_get_increments      (GtkSpinButton *spin_button,
                                                             gdouble *step,
                                                             gdouble *page);
    gboolean            gtk_spin_button_get_numeric         (GtkSpinButton *spin_button);
    void                gtk_spin_button_get_range           (GtkSpinButton *spin_button,
                                                             gdouble *min,
                                                             gdouble *max);
    gboolean            gtk_spin_button_get_snap_to_ticks   (GtkSpinButton *spin_button);
    GtkSpinButtonUpdatePolicy gtk_spin_button_get_update_policy
                                                            (GtkSpinButton *spin_button);
    gdouble             gtk_spin_button_get_value           (GtkSpinButton *spin_button);
    gboolean            gtk_spin_button_get_wrap            (GtkSpinButton *spin_button);
    #define             GTK_INPUT_ERROR

## Object Hierarchy

      GObject
       +----GInitiallyUnowned
             +----GtkWidget
                   +----GtkEntry
                         +----GtkSpinButton

## Implemented Interfaces

GtkSpinButton implements AtkImplementorIface, GtkBuildable, GtkEditable and GtkCellEditable.

## Properties

      "adjustment"               GtkAdjustment*        : Read / Write
      "climb-rate"               gdouble               : Read / Write
      "digits"                   guint                 : Read / Write
      "numeric"                  gboolean              : Read / Write
      "snap-to-ticks"            gboolean              : Read / Write
      "update-policy"            GtkSpinButtonUpdatePolicy  : Read / Write
      "value"                    gdouble               : Read / Write
      "wrap"                     gboolean              : Read / Write

## Style Properties

      "shadow-type"              GtkShadowType         : Read

## Signals

      "change-value"                                   : Action
      "input"                                          : Run Last
      "output"                                         : Run Last
      "value-changed"                                  : Run Last
      "wrapped"                                        : Run Last

## Description

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 an adjustment. See the GtkAdjustment section for more details about an adjustment's properties.

Example 55. Using a GtkSpinButton to get an integer

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    /* 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 *button,
                    gpointer       user_data)
    {
      return gtk_spin_button_get_value_as_int (button);
    }

    void
    create_integer_spin_button (void)
    {

      GtkWidget *window, *button;
      GtkAdjustment *adjustment;

      adjustment = gtk_adjustment_new (50.0, 0.0, 100.0, 1.0, 5.0, 0.0);

      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
      gtk_container_set_border_width (GTK_CONTAINER (window), 5);

      /* creates the spinbutton, with no decimal places */
      button = gtk_spin_button_new (adjustment, 1.0, 0);
      gtk_container_add (GTK_CONTAINER (window), button);

      gtk_widget_show_all (window);
    }

Example 56. Using a GtkSpinButton to get a floating point value

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    /* Provides a function to retrieve a floating point value from a
     * GtkSpinButton, and creates a high precision spin button.
     */

    gfloat
    grab_float_value (GtkSpinButton *button,
                      gpointer       user_data)
    {
      return gtk_spin_button_get_value (button);
    }

    void
    create_floating_spin_button (void)
    {
      GtkWidget *window, *button;
      GtkAdjustment *adjustment;

      adjustment = gtk_adjustment_new (2.500, 0.0, 5.0, 0.001, 0.1, 0.0);

      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
      gtk_container_set_border_width (GTK_CONTAINER (window), 5);

      /* creates the spinbutton, with three decimal places */
      button = gtk_spin_button_new (adjustment, 0.001, 3);
      gtk_container_add (GTK_CONTAINER (window), button);

      gtk_widget_show_all (window);
    }

## Details

### struct GtkSpinButton

    struct GtkSpinButton;

The GtkSpinButton struct contains only private data and should not be directly modified.

### enum GtkSpinButtonUpdatePolicy

    typedef enum {
      GTK_UPDATE_ALWAYS,
      GTK_UPDATE_IF_VALID
    } GtkSpinButtonUpdatePolicy;

The spin button update policy determines whether the spin button displays values even if they are outside the bounds of its adjustment. See `gtk_spin_button_set_update_policy()`.

`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 adjustment

### enum GtkSpinType

    typedef enum {
      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
    } GtkSpinType;

The values of the GtkSpinType enumeration are used to specify the change to make in `gtk_spin_button_spin()`.

`GTK_SPIN_STEP_FORWARD` | Increment by the adjustments step increment.
`GTK_SPIN_STEP_BACKWARD` | Decrement by the adjustments step increment.
`GTK_SPIN_PAGE_FORWARD` | Increment by the adjustments page increment.
`GTK_SPIN_PAGE_BACKWARD` | Decrement by the adjustments page increment.
`GTK_SPIN_HOME` | Go to the adjustments lower bound.
`GTK_SPIN_END` | Go to the adjustments upper bound.
`GTK_SPIN_USER_DEFINED` | Change by a specified amount.

### gtk_spin_button_configure ()

    void                gtk_spin_button_configure           (GtkSpinButton *spin_button,
                                                             GtkAdjustment *adjustment,
                                                             gdouble climb_rate,
                                                             guint digits);

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. [allow-none]
`climb_rate` : | the new climb rate
`digits` : | the number of decimal places to display in the spin button

### gtk_spin_button_new ()

    GtkWidget *         gtk_spin_button_new                 (GtkAdjustment *adjustment,
                                                             gdouble climb_rate,
                                                             guint digits);

Creates a new GtkSpinButton.

`adjustment` : | the GtkAdjustment object that this spin button should use, or `NULL`. [allow-none]
`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

### gtk_spin_button_new_with_range ()

    GtkWidget *         gtk_spin_button_new_with_range      (gdouble min,
                                                             gdouble max,
                                                             gdouble step);

This is a convenience constructor that allows creation of a numeric GtkSpinButton without manually creating an adjustment. The value is initially set to the minimum value and a page increment of 10 * `step` is the default. The precision of the spin button is equivalent to the precision of `step`.

Note that the way in which the precision is derived works best if `step` is a power of ten. If the resulting precision is not suitable for your needs, use `gtk_spin_button_set_digits()` to correct it.

`min` : | Minimum allowable value
`max` : | Maximum allowable value
`step` : | Increment added or subtracted by spinning the widget
Returns : | The new spin button as a GtkWidget

### gtk_spin_button_set_adjustment ()

    void                gtk_spin_button_set_adjustment      (GtkSpinButton *spin_button,
                                                             GtkAdjustment *adjustment);

Replaces the GtkAdjustment associated with `spin_button`.

`spin_button` : | a GtkSpinButton
`adjustment` : | a GtkAdjustment to replace the existing adjustment

### gtk_spin_button_get_adjustment ()

    GtkAdjustment *     gtk_spin_button_get_adjustment      (GtkSpinButton *spin_button);

Get the adjustment associated with a GtkSpinButton

`spin_button` : | a GtkSpinButton
Returns : | the GtkAdjustment of `spin_button`. [transfer none]

### gtk_spin_button_set_digits ()

    void                gtk_spin_button_set_digits          (GtkSpinButton *spin_button,
                                                             guint digits);

Set the precision to be displayed by `spin_button`. Up to 20 digit precision is allowed.

`spin_button` : | a GtkSpinButton
`digits` : | the number of digits after the decimal point to be displayed for the spin button's value

### gtk_spin_button_set_increments ()

    void                gtk_spin_button_set_increments      (GtkSpinButton *spin_button,
                                                             gdouble step,
                                                             gdouble page);

Sets the step and page increments for spin_button. This affects how quickly the value changes when the spin button's arrows are activated.

`spin_button` : | a GtkSpinButton
`step` : | increment applied for a button 1 press.
`page` : | increment applied for a button 2 press.

### gtk_spin_button_set_range ()

    void                gtk_spin_button_set_range           (GtkSpinButton *spin_button,
                                                             gdouble min,
                                                             gdouble max);

Sets the minimum and maximum allowable values for `spin_button`.

If the current value is outside this range, it will be adjusted to fit within the range, otherwise it will remain unchanged.

`spin_button` : | a GtkSpinButton
`min` : | minimum allowable value
`max` : | maximum allowable value

### gtk_spin_button_get_value_as_int ()

    gint                gtk_spin_button_get_value_as_int    (GtkSpinButton *spin_button);

Get the value `spin_button` represented as an integer.

`spin_button` : | a GtkSpinButton
Returns : | the value of `spin_button`

### gtk_spin_button_set_value ()

    void                gtk_spin_button_set_value           (GtkSpinButton *spin_button,
                                                             gdouble value);

Sets the value of `spin_button`.

`spin_button` : | a GtkSpinButton
`value` : | the new value

### gtk_spin_button_set_update_policy ()

    void                gtk_spin_button_set_update_policy   (GtkSpinButton *spin_button,
                                                             GtkSpinButtonUpdatePolicy policy);

Sets the update behavior of a spin button. This determines wether the spin button is always updated or only when a valid value is set.

`spin_button` : | a GtkSpinButton
`policy` : | a GtkSpinButtonUpdatePolicy value

### gtk_spin_button_set_numeric ()

    void                gtk_spin_button_set_numeric         (GtkSpinButton *spin_button,
                                                             gboolean numeric);

Sets the flag that determines if non-numeric text can be typed into the spin button.

`spin_button` : | a GtkSpinButton
`numeric` : | flag indicating if only numeric entry is allowed

### gtk_spin_button_spin ()

    void                gtk_spin_button_spin                (GtkSpinButton *spin_button,
                                                             GtkSpinType direction,
                                                             gdouble increment);

Increment or decrement a spin button's value in a specified direction by a specified amount.

`spin_button` : | a GtkSpinButton
`direction` : | a GtkSpinType indicating the direction to spin
`increment` : | step increment to apply in the specified direction

### gtk_spin_button_set_wrap ()

    void                gtk_spin_button_set_wrap            (GtkSpinButton *spin_button,
                                                             gboolean wrap);

Sets the flag that determines if a spin button value wraps around to the opposite limit when the upper or lower limit of the range is exceeded.

`spin_button` : | a GtkSpinButton
`wrap` : | a flag indicating if wrapping behavior is performed

### gtk_spin_button_set_snap_to_ticks ()

    void                gtk_spin_button_set_snap_to_ticks   (GtkSpinButton *spin_button,
                                                             gboolean snap_to_ticks);

Sets the policy as to whether values are corrected to the nearest step increment when a spin button is activated after providing an invalid value.

`spin_button` : | a GtkSpinButton
`snap_to_ticks` : | a flag indicating if invalid values should be corrected

### gtk_spin_button_update ()

    void                gtk_spin_button_update              (GtkSpinButton *spin_button);

Manually force an update of the spin button.

`spin_button` : | a GtkSpinButton

### gtk_spin_button_get_digits ()

    guint               gtk_spin_button_get_digits          (GtkSpinButton *spin_button);

Fetches the precision of `spin_button`. See `gtk_spin_button_set_digits()`.

`spin_button` : | a GtkSpinButton
Returns : | the current precision

### gtk_spin_button_get_increments ()

    void                gtk_spin_button_get_increments      (GtkSpinButton *spin_button,
                                                             gdouble *step,
                                                             gdouble *page);

Gets the current step and page the increments used by `spin_button`. See `gtk_spin_button_set_increments()`.

`spin_button` : | a GtkSpinButton
`step` : | location to store step increment, or `NULL`. [out][allow-none]
`page` : | location to store page increment, or `NULL`. [out][allow-none]

### gtk_spin_button_get_numeric ()

    gboolean            gtk_spin_button_get_numeric         (GtkSpinButton *spin_button);

Returns whether non-numeric text can be typed into the spin button. See `gtk_spin_button_set_numeric()`.

`spin_button` : | a GtkSpinButton
Returns : | `TRUE` if only numeric text can be entered

### gtk_spin_button_get_range ()

    void                gtk_spin_button_get_range           (GtkSpinButton *spin_button,
                                                             gdouble *min,
                                                             gdouble *max);

Gets the range allowed for `spin_button`. See `gtk_spin_button_set_range()`.

`spin_button` : | a GtkSpinButton
`min` : | location to store minimum allowed value, or `NULL`. [out][allow-none]
`max` : | location to store maximum allowed value, or `NULL`. [out][allow-none]

### gtk_spin_button_get_snap_to_ticks ()

    gboolean            gtk_spin_button_get_snap_to_ticks   (GtkSpinButton *spin_button);

Returns whether the values are corrected to the nearest step. See `gtk_spin_button_set_snap_to_ticks()`.

`spin_button` : | a GtkSpinButton
Returns : | `TRUE` if values are snapped to the nearest step

### gtk_spin_button_get_update_policy ()

    GtkSpinButtonUpdatePolicy gtk_spin_button_get_update_policy
                                                            (GtkSpinButton *spin_button);

Gets the update behavior of a spin button. See `gtk_spin_button_set_update_policy()`.

`spin_button` : | a GtkSpinButton
Returns : | the current update policy

### gtk_spin_button_get_value ()

    gdouble             gtk_spin_button_get_value           (GtkSpinButton *spin_button);

Get the value in the `spin_button`.

`spin_button` : | a GtkSpinButton
Returns : | the value of `spin_button`

### gtk_spin_button_get_wrap ()

    gboolean            gtk_spin_button_get_wrap            (GtkSpinButton *spin_button);

Returns whether the spin button's value wraps around to the opposite limit when the upper or lower limit of the range is exceeded. See `gtk_spin_button_set_wrap()`.

`spin_button` : | a GtkSpinButton
Returns : | `TRUE` if the spin button wraps around

### GTK_INPUT_ERROR

    #define GTK_INPUT_ERROR -1

Constant to return from a signal handler for the "input" signal in case of conversion failure.

## Property Details

### The `"adjustment"` property

      "adjustment"               GtkAdjustment*        : Read / Write

The adjustment that holds the value of the spin button.

### The `"climb-rate"` property

      "climb-rate"               gdouble               : Read / Write

The acceleration rate when you hold down a button.

Allowed values: >= 0

Default value: 0

### The `"digits"` property

      "digits"                   guint                 : Read / Write

The number of decimal places to display.

Allowed values: <= 20

Default value: 0

### The `"numeric"` property

      "numeric"                  gboolean              : Read / Write

Whether non-numeric characters should be ignored.

Default value: FALSE

### The `"snap-to-ticks"` property

      "snap-to-ticks"            gboolean              : Read / Write

Whether erroneous values are automatically changed to a spin button's nearest step increment.

Default value: FALSE

### The `"update-policy"` property

      "update-policy"            GtkSpinButtonUpdatePolicy  : Read / Write

Whether the spin button should update always, or only when the value is legal.

Default value: GTK_UPDATE_ALWAYS

### The `"value"` property

      "value"                    gdouble               : Read / Write

Reads the current value, or sets a new value.

Default value: 0

### The `"wrap"` property

      "wrap"                     gboolean              : Read / Write

Whether a spin button should wrap upon reaching its limits.

Default value: FALSE

## Style Property Details

### The `"shadow-type"` style property

      "shadow-type"              GtkShadowType         : Read

Style of bevel around the spin button.

Default value: GTK_SHADOW_IN

## Signal Details

### The `"change-value"` signal

    void                user_function                      (GtkSpinButton *spinbutton,
                                                            GtkScrollType  arg1,
                                                            gpointer       user_data)       : Action

### The `"input"` signal

    gint                user_function                      (GtkSpinButton *spin_button,
                                                            gpointer       new_value,
                                                            gpointer       user_data)        : Run Last

The ::input signal can be used to influence the conversion of the users input into a double value. The signal handler is expected to use `gtk_entry_get_text()` to retrieve the text of the entry and set `new_value` to the new value.

The default conversion uses `g_strtod()`.

`spin_button` : | the object on which the signal was emitted
`new_value` : | return location for the new value. [out][type double]
`user_data` : | user data set when the signal handler was connected.
Returns : | `TRUE` for a successful conversion, `FALSE` if the input was not handled, and `GTK_INPUT_ERROR` if the conversion failed.

### The `"output"` signal

    gboolean            user_function                      (GtkSpinButton *spin_button,
                                                            gpointer       user_data)        : Run Last

The ::output signal can be used to change to formatting of the value that is displayed in the spin buttons entry.

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    /* show leading zeros */
    static gboolean
    on_output (GtkSpinButton *spin,
               gpointer       data)
    {
       GtkAdjustment *adjustment;
       gchar *text;
       int value;
       adjustment = gtk_spin_button_get_adjustment (spin);
       value = (int)gtk_adjustment_get_value (adjustment);
       text = g_strdup_printf ("%02d", value);
       gtk_entry_set_text (GTK_ENTRY (spin), text);
       g_free (text);

       return TRUE;
    }

`spin_button` : | the object which received the signal
`user_data` : | user data set when the signal handler was connected.
Returns : | `TRUE` if the value has been displayed

### The `"value-changed"` signal

    void                user_function                      (GtkSpinButton *spinbutton,
                                                            gpointer       user_data)       : Run Last

### The `"wrapped"` signal

    void                user_function                      (GtkSpinButton *spinbutton,
                                                            gpointer       user_data)       : Run Last

The wrapped signal is emitted right after the spinbutton wraps from its maximum to minimum value or vice-versa.

`spinbutton` : | the object which received the signal
`user_data` : | user data set when the signal handler was connected.

Since 2.10

## See Also

GtkEntry