## GtkRange

GtkRange — Base class for widgets which visualize an adjustment

## Functions

gdouble | gtk_range_get_fill_level ()
gboolean | gtk_range_get_restrict_to_fill_level ()
gboolean | gtk_range_get_show_fill_level ()
void | gtk_range_set_fill_level ()
void | gtk_range_set_restrict_to_fill_level ()
void | gtk_range_set_show_fill_level ()
GtkAdjustment * | gtk_range_get_adjustment ()
void | gtk_range_set_adjustment ()
gboolean | gtk_range_get_inverted ()
void | gtk_range_set_inverted ()
gdouble | gtk_range_get_value ()
void | gtk_range_set_value ()
void | gtk_range_set_increments ()
void | gtk_range_set_range ()
gint | gtk_range_get_round_digits ()
void | gtk_range_set_round_digits ()
void | gtk_range_set_lower_stepper_sensitivity ()
GtkSensitivityType | gtk_range_get_lower_stepper_sensitivity ()
void | gtk_range_set_upper_stepper_sensitivity ()
GtkSensitivityType | gtk_range_get_upper_stepper_sensitivity ()
gboolean | gtk_range_get_flippable ()
void | gtk_range_set_flippable ()
gint | gtk_range_get_min_slider_size ()
void | gtk_range_get_range_rect ()
void | gtk_range_get_slider_range ()
gboolean | gtk_range_get_slider_size_fixed ()
void | gtk_range_set_min_slider_size ()
void | gtk_range_set_slider_size_fixed ()

## Properties

GtkAdjustment * | adjustment | Read / Write / Construct
gdouble | fill-level | Read / Write
gboolean | inverted | Read / Write
GtkSensitivityType | lower-stepper-sensitivity | Read / Write
gboolean | restrict-to-fill-level | Read / Write
gint | round-digits | Read / Write
gboolean | show-fill-level | Read / Write
GtkSensitivityType | upper-stepper-sensitivity | Read / Write

## Style Properties

gint | arrow-displacement-x | Read
gint | arrow-displacement-y | Read
gfloat | arrow-scaling | Read
gint | slider-width | Read
gint | stepper-size | Read
gint | stepper-spacing | Read
gint | trough-border | Read
gboolean | trough-under-steppers | Read

## Signals

void | adjust-bounds | Run Last
gboolean | change-value | Run Last
void | move-slider | Action
void | value-changed | Run Last

## Types and Values

struct | GtkRange
enum | GtkSensitivityType

## Object Hierarchy

        GObject
        ╰── GInitiallyUnowned
            ╰── GtkWidget
                ╰── GtkRange
                    ├── GtkScale
                    ╰── GtkScrollbar

## Implemented Interfaces

GtkRange implements AtkImplementorIface, GtkBuildable and GtkOrientable.

## Includes

    #include <gtk/gtk.h>

## Description

GtkRange is the common base class for widgets which visualize an adjustment, e.g GtkScale or GtkScrollbar.

Apart from signals for monitoring the parameters of the adjustment, GtkRange provides properties and methods for influencing the sensitivity of the “steppers”. It also provides properties and methods for setting a “fill level” on range widgets. See `gtk_range_set_fill_level()`.

## Functions

### gtk_range_get_fill_level ()

    gdouble
    gtk_range_get_fill_level (GtkRange *range);

Gets the current position of the fill level indicator.

#### Parameters

range | A GtkRange |

#### Returns

The current fill level

Since: 2.12

### gtk_range_get_restrict_to_fill_level ()

    gboolean
    gtk_range_get_restrict_to_fill_level (GtkRange *range);

Gets whether the range is restricted to the fill level.

#### Parameters

range | A GtkRange |

#### Returns

`TRUE` if `range` is restricted to the fill level.

Since: 2.12

### gtk_range_get_show_fill_level ()

    gboolean
    gtk_range_get_show_fill_level (GtkRange *range);

Gets whether the range displays the fill level graphically.

#### Parameters

range | A GtkRange |

#### Returns

`TRUE` if `range` shows the fill level.

Since: 2.12

### gtk_range_set_fill_level ()

    void
    gtk_range_set_fill_level (GtkRange *range,
                              gdouble fill_level);

Set the new position of the fill level indicator.

The “fill level” is probably best described by its most prominent use case, which is an indicator for the amount of pre-buffering in a streaming media player. In that use case, the value of the range would indicate the current play position, and the fill level would be the position up to which the file/stream has been downloaded.

This amount of prebuffering can be displayed on the range’s trough and is themeable separately from the trough. To enable fill level display, use `gtk_range_set_show_fill_level()`. The range defaults to not showing the fill level.

Additionally, it’s possible to restrict the range’s slider position to values which are smaller than the fill level. This is controller by `gtk_range_set_restrict_to_fill_level()` and is by default enabled.

#### Parameters

range | a GtkRange |
fill_level | the new position of the fill level indicator |

Since: 2.12

### gtk_range_set_restrict_to_fill_level ()

    void
    gtk_range_set_restrict_to_fill_level (GtkRange *range,
                                          gboolean restrict_to_fill_level);

Sets whether the slider is restricted to the fill level. See `gtk_range_set_fill_level()` for a general description of the fill level concept.

#### Parameters

range | A GtkRange |
restrict_to_fill_level | Whether the fill level restricts slider movement. |

Since: 2.12

### gtk_range_set_show_fill_level ()

    void
    gtk_range_set_show_fill_level (GtkRange *range,
                                   gboolean show_fill_level);

Sets whether a graphical fill level is show on the trough. See `gtk_range_set_fill_level()` for a general description of the fill level concept.

#### Parameters

range | A GtkRange |
show_fill_level | Whether a fill level indicator graphics is shown. |

Since: 2.12

### gtk_range_get_adjustment ()

    GtkAdjustment *
    gtk_range_get_adjustment (GtkRange *range);

Get the GtkAdjustment which is the “model” object for GtkRange. See `gtk_range_set_adjustment()` for details. The return value does not have a reference added, so should not be unreferenced.

#### Parameters

range | a GtkRange |

#### Returns

a GtkAdjustment.

[transfer none]

### gtk_range_set_adjustment ()

    void
    gtk_range_set_adjustment (GtkRange *range,
                              GtkAdjustment *adjustment);

Sets the adjustment to be used as the “model” object for this range widget. The adjustment indicates the current range value, the minimum and maximum range values, the step/page increments used for keybindings and scrolling, and the page size. The page size is normally 0 for GtkScale and nonzero for GtkScrollbar, and indicates the size of the visible area of the widget being scrolled. The page size affects the size of the scrollbar slider.

#### Parameters

range | a GtkRange |
adjustment | a GtkAdjustment |

### gtk_range_get_inverted ()

    gboolean
    gtk_range_get_inverted (GtkRange *range);

Gets the value set by `gtk_range_set_inverted()`.

#### Parameters

range | a GtkRange |

#### Returns

`TRUE` if the range is inverted

### gtk_range_set_inverted ()

    void
    gtk_range_set_inverted (GtkRange *range,
                            gboolean setting);

Ranges normally move from lower to higher values as the slider moves from top to bottom or left to right. Inverted ranges have higher values at the top or on the right rather than on the bottom or left.

#### Parameters

range | a GtkRange |
setting | `TRUE` to invert the range |

### gtk_range_get_value ()

    gdouble
    gtk_range_get_value (GtkRange *range);

Gets the current value of the range.

#### Parameters

range | a GtkRange |

#### Returns

current value of the range.

### gtk_range_set_value ()

    void
    gtk_range_set_value (GtkRange *range,
                         gdouble value);

Sets the current value of the range; if the value is outside the minimum or maximum range values, it will be clamped to fit inside them. The range emits the “value-changed” signal if the value changes.

#### Parameters

range | a GtkRange |
value | new value of the range |

### gtk_range_set_increments ()

    void
    gtk_range_set_increments (GtkRange *range,
                              gdouble step,
                              gdouble page);

Sets the step and page sizes for the range. The step size is used when the user clicks the GtkScrollbar arrows or moves GtkScale via arrow keys. The page size is used for example when moving via Page Up or Page Down keys.

#### Parameters

range | a GtkRange |
step | step size |
page | page size |

### gtk_range_set_range ()

    void
    gtk_range_set_range (GtkRange *range,
                         gdouble min,
                         gdouble max);

Sets the allowable values in the GtkRange, and clamps the range value to be between `min` and `max` . (If the range has a non-zero page size, it is clamped between `min` and `max` - page-size.)

#### Parameters

range | a GtkRange |
min | minimum range value |
max | maximum range value |

### gtk_range_get_round_digits ()

    gint
    gtk_range_get_round_digits (GtkRange *range);

Gets the number of digits to round the value to when it changes. See “change-value”.

#### Parameters

range | a GtkRange |

#### Returns

the number of digits to round to

Since: 2.24

### gtk_range_set_round_digits ()

    void
    gtk_range_set_round_digits (GtkRange *range,
                                gint round_digits);

Sets the number of digits to round the value to when it changes. See “change-value”.

#### Parameters

range | a GtkRange |
round_digits | the precision in digits, or -1 |

Since: 2.24

### gtk_range_set_lower_stepper_sensitivity ()

    void
    gtk_range_set_lower_stepper_sensitivity
                                   (GtkRange *range,
                                    GtkSensitivityType sensitivity);

Sets the sensitivity policy for the stepper that points to the 'lower' end of the GtkRange’s adjustment.

#### Parameters

range | a GtkRange |
sensitivity | the lower stepper’s sensitivity policy. |

Since: 2.10

### gtk_range_get_lower_stepper_sensitivity ()

    GtkSensitivityType
    gtk_range_get_lower_stepper_sensitivity
                                   (GtkRange *range);

Gets the sensitivity policy for the stepper that points to the 'lower' end of the GtkRange’s adjustment.

#### Parameters

range | a GtkRange |

#### Returns

The lower stepper’s sensitivity policy.

Since: 2.10

### gtk_range_set_upper_stepper_sensitivity ()

    void
    gtk_range_set_upper_stepper_sensitivity
                                   (GtkRange *range,
                                    GtkSensitivityType sensitivity);

Sets the sensitivity policy for the stepper that points to the 'upper' end of the GtkRange’s adjustment.

#### Parameters

range | a GtkRange |
sensitivity | the upper stepper’s sensitivity policy. |

Since: 2.10

### gtk_range_get_upper_stepper_sensitivity ()

    GtkSensitivityType
    gtk_range_get_upper_stepper_sensitivity
                                   (GtkRange *range);

Gets the sensitivity policy for the stepper that points to the 'upper' end of the GtkRange’s adjustment.

#### Parameters

range | a GtkRange |

#### Returns

The upper stepper’s sensitivity policy.

Since: 2.10

### gtk_range_get_flippable ()

    gboolean
    gtk_range_get_flippable (GtkRange *range);

Gets the value set by `gtk_range_set_flippable()`.

#### Parameters

range | a GtkRange |

#### Returns

`TRUE` if the range is flippable

Since: 2.18

### gtk_range_set_flippable ()

    void
    gtk_range_set_flippable (GtkRange *range,
                             gboolean flippable);

If a range is flippable, it will switch its direction if it is horizontal and its direction is `GTK_TEXT_DIR_RTL`.

See `gtk_widget_get_direction()`.

#### Parameters

range | a GtkRange |
flippable | `TRUE` to make the range flippable |

Since: 2.18

### gtk_range_get_min_slider_size ()

    gint
    gtk_range_get_min_slider_size (GtkRange *range);

This function is useful mainly for GtkRange subclasses.

See `gtk_range_set_min_slider_size()`.

#### Parameters

range | a GtkRange |

#### Returns

The minimum size of the range’s slider.

Since: 2.20

### gtk_range_get_range_rect ()

    void
    gtk_range_get_range_rect (GtkRange *range,
                              GdkRectangle *range_rect);

This function returns the area that contains the range’s trough and its steppers, in widget->window coordinates.

This function is useful mainly for GtkRange subclasses.

#### Parameters

range | a GtkRange |
range_rect | return location for the range rectangle. | [out]

Since: 2.20

### gtk_range_get_slider_range ()

    void
    gtk_range_get_slider_range (GtkRange *range,
                                gint *slider_start,
                                gint *slider_end);

This function returns sliders range along the long dimension, in widget->window coordinates.

This function is useful mainly for GtkRange subclasses.

#### Parameters

range | a GtkRange |
slider_start | return location for the slider's start, or `NULL`. | [out][allow-none]
slider_end | return location for the slider's end, or `NULL`. | [out][allow-none]

Since: 2.20

### gtk_range_get_slider_size_fixed ()

    gboolean
    gtk_range_get_slider_size_fixed (GtkRange *range);

This function is useful mainly for GtkRange subclasses.

See `gtk_range_set_slider_size_fixed()`.

#### Parameters

range | a GtkRange |

#### Returns

whether the range’s slider has a fixed size.

Since: 2.20

### gtk_range_set_min_slider_size ()

    void
    gtk_range_set_min_slider_size (GtkRange *range,
                                   gint min_size);

Sets the minimum size of the range’s slider.

This function is useful mainly for GtkRange subclasses.

#### Parameters

range | a GtkRange |
min_size | The slider’s minimum size |

Since: 2.20

### gtk_range_set_slider_size_fixed ()

    void
    gtk_range_set_slider_size_fixed (GtkRange *range,
                                     gboolean size_fixed);

Sets whether the range’s slider has a fixed size, or a size that depends on its adjustment’s page size.

This function is useful mainly for GtkRange subclasses.

#### Parameters

range | a GtkRange |
size_fixed | `TRUE` to make the slider size constant |

Since: 2.20

## Types and Values

### struct GtkRange

    struct GtkRange;

### enum GtkSensitivityType

Determines how GTK+ handles the sensitivity of stepper arrows at the end of range widgets.

#### Members

GTK_SENSITIVITY_AUTO | The arrow is made insensitive if the thumb is at the end |
GTK_SENSITIVITY_ON | The arrow is always sensitive |
GTK_SENSITIVITY_OFF | The arrow is always insensitive |

## Property Details

### The `“adjustment”` property

      “adjustment”               GtkAdjustment *

The GtkAdjustment that contains the current value of this range object.

Flags: Read / Write / Construct

### The `“fill-level”` property

      “fill-level”               gdouble

The fill level (e.g. prebuffering of a network stream). See `gtk_range_set_fill_level()`.

Flags: Read / Write

Default value: 1.79769e+308

Since: 2.12

### The `“inverted”` property

      “inverted”                 gboolean

Invert direction slider moves to increase range value.

Flags: Read / Write

Default value: FALSE

### The `“lower-stepper-sensitivity”` property

      “lower-stepper-sensitivity” GtkSensitivityType

The sensitivity policy for the stepper that points to the adjustment's lower side.

Flags: Read / Write

Default value: GTK_SENSITIVITY_AUTO

### The `“restrict-to-fill-level”` property

      “restrict-to-fill-level”   gboolean

The restrict-to-fill-level property controls whether slider movement is restricted to an upper boundary set by the fill level. See `gtk_range_set_restrict_to_fill_level()`.

Flags: Read / Write

Default value: TRUE

Since: 2.12

### The `“round-digits”` property

      “round-digits”             gint

The number of digits to round the value to when it changes, or -1. See “change-value”.

Flags: Read / Write

Allowed values: >= -1

Default value: -1

Since: 2.24

### The `“show-fill-level”` property

      “show-fill-level”          gboolean

The show-fill-level property controls whether fill level indicator graphics are displayed on the trough. See `gtk_range_set_show_fill_level()`.

Flags: Read / Write

Default value: FALSE

Since: 2.12

### The `“upper-stepper-sensitivity”` property

      “upper-stepper-sensitivity” GtkSensitivityType

The sensitivity policy for the stepper that points to the adjustment's upper side.

Flags: Read / Write

Default value: GTK_SENSITIVITY_AUTO

## Style Property Details

### The `“arrow-displacement-x”` style property

      “arrow-displacement-x”     gint

How far in the x direction to move the arrow when the button is depressed.

Flags: Read

Default value: 0

### The `“arrow-displacement-y”` style property

      “arrow-displacement-y”     gint

How far in the y direction to move the arrow when the button is depressed.

Flags: Read

Default value: 0

### The `“arrow-scaling”` style property

      “arrow-scaling”            gfloat

The arrow size proportion relative to the scroll button size.

Flags: Read

Allowed values: [0,1]

Default value: 0.5

Since: 2.14

### The `“slider-width”` style property

      “slider-width”             gint

Width of scrollbar or scale thumb.

Flags: Read

Allowed values: >= 0

Default value: 14

### The `“stepper-size”` style property

      “stepper-size”             gint

Length of step buttons at ends.

Flags: Read

Allowed values: >= 0

Default value: 14

### The `“stepper-spacing”` style property

      “stepper-spacing”          gint

The spacing between the stepper buttons and thumb. Note that stepper-spacing won't have any effect if there are no steppers.

Flags: Read

Allowed values: >= 0

Default value: 0

### The `“trough-border”` style property

      “trough-border”            gint

Spacing between thumb/steppers and outer trough bevel.

Flags: Read

Allowed values: >= 0

Default value: 1

### The `“trough-under-steppers”` style property

      “trough-under-steppers”    gboolean

Whether to draw the trough across the full length of the range or to exclude the steppers and their spacing.

Flags: Read

Default value: TRUE

Since: 2.10

## Signal Details

### The `“adjust-bounds”` signal

    void
    user_function (GtkRange *range,
                   gdouble   value,
                   gpointer  user_data)

Emitted before clamping a value, to give the application a chance to adjust the bounds.

#### Parameters

range | the GtkRange that received the signal |
value | the value before we clamp |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

### The `“change-value”` signal

    gboolean
    user_function (GtkRange     *range,
                   GtkScrollType scroll,
                   gdouble       value,
                   gpointer      user_data)

The “change-value” signal is emitted when a scroll action is performed on a range. It allows an application to determine the type of scroll event that occurred and the resultant new value. The application can handle the event itself and return `TRUE` to prevent further processing. Or, by returning `FALSE`, it can pass the event to other handlers until the default GTK+ handler is reached.

The value parameter is unrounded. An application that overrides the GtkRange::change-value signal is responsible for clamping the value to the desired number of decimal digits; the default GTK+ handler clamps the value based on “round-digits”.

It is not possible to use delayed update policies in an overridden “change-value” handler.

#### Parameters

range | the GtkRange that received the signal |
scroll | the type of scroll action that was performed |
value | the new value resulting from the scroll action |
user_data | user data set when the signal handler was connected. |

#### Returns

`TRUE` to prevent other handlers from being invoked for the signal, `FALSE` to propagate the signal further

Flags: Run Last

Since: 2.6

### The `“move-slider”` signal

    void
    user_function (GtkRange     *range,
                   GtkScrollType step,
                   gpointer      user_data)

Virtual function that moves the slider. Used for keybindings.

#### Parameters

range | the GtkRange that received the signal |
step | how to move the slider |
user_data | user data set when the signal handler was connected. |

Flags: Action

### The `“value-changed”` signal

    void
    user_function (GtkRange *range,
                   gpointer  user_data)

Emitted when the range value changes.

#### Parameters

range | the GtkRange that received the signal |
user_data | user data set when the signal handler was connected. |

Flags: Run Last