GtkRange

## GtkRange GtkRange — Base class for widgets which visualize an adjustment |

## Synopsis

    #include <gtk/gtk.h>

    struct              GtkRange;
    gdouble             gtk_range_get_fill_level            (GtkRange *range);
    gboolean            gtk_range_get_restrict_to_fill_level
                                                            (GtkRange *range);
    gboolean            gtk_range_get_show_fill_level       (GtkRange *range);
    void                gtk_range_set_fill_level            (GtkRange *range,
                                                             gdouble fill_level);
    void                gtk_range_set_restrict_to_fill_level
                                                            (GtkRange *range,
                                                             gboolean restrict_to_fill_level);
    void                gtk_range_set_show_fill_level       (GtkRange *range,
                                                             gboolean show_fill_level);
    GtkAdjustment *     gtk_range_get_adjustment            (GtkRange *range);
    void                gtk_range_set_adjustment            (GtkRange *range,
                                                             GtkAdjustment *adjustment);
    gboolean            gtk_range_get_inverted              (GtkRange *range);
    void                gtk_range_set_inverted              (GtkRange *range,
                                                             gboolean setting);
    gdouble             gtk_range_get_value                 (GtkRange *range);
    void                gtk_range_set_value                 (GtkRange *range,
                                                             gdouble value);
    void                gtk_range_set_increments            (GtkRange *range,
                                                             gdouble step,
                                                             gdouble page);
    void                gtk_range_set_range                 (GtkRange *range,
                                                             gdouble min,
                                                             gdouble max);
    gint                gtk_range_get_round_digits          (GtkRange *range);
    void                gtk_range_set_round_digits          (GtkRange *range,
                                                             gint round_digits);
    enum                GtkSensitivityType;
    void                gtk_range_set_lower_stepper_sensitivity
                                                            (GtkRange *range,
                                                             GtkSensitivityType sensitivity);
    GtkSensitivityType  gtk_range_get_lower_stepper_sensitivity
                                                            (GtkRange *range);
    void                gtk_range_set_upper_stepper_sensitivity
                                                            (GtkRange *range,
                                                             GtkSensitivityType sensitivity);
    GtkSensitivityType  gtk_range_get_upper_stepper_sensitivity
                                                            (GtkRange *range);
    gboolean            gtk_range_get_flippable             (GtkRange *range);
    void                gtk_range_set_flippable             (GtkRange *range,
                                                             gboolean flippable);
    gint                gtk_range_get_min_slider_size       (GtkRange *range);
    void                gtk_range_get_range_rect            (GtkRange *range,
                                                             GdkRectangle *range_rect);
    void                gtk_range_get_slider_range          (GtkRange *range,
                                                             gint *slider_start,
                                                             gint *slider_end);
    gboolean            gtk_range_get_slider_size_fixed     (GtkRange *range);
    void                gtk_range_set_min_slider_size       (GtkRange *range,
                                                             gint min_size);
    void                gtk_range_set_slider_size_fixed     (GtkRange *range,
                                                             gboolean size_fixed);

## Object Hierarchy

      GObject
       +----GInitiallyUnowned
             +----GtkWidget
                   +----GtkRange
                         +----GtkScale
                         +----GtkScrollbar

## Implemented Interfaces

GtkRange implements AtkImplementorIface, GtkBuildable and GtkOrientable.

## Properties

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

## Style Properties

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

## Signals

      "adjust-bounds"                                  : Run Last
      "change-value"                                   : Run Last
      "move-slider"                                    : Action
      "value-changed"                                  : Run Last

## 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()`.

## Details

### struct GtkRange

    struct GtkRange;

### gtk_range_get_fill_level ()

    gdouble             gtk_range_get_fill_level            (GtkRange *range);

Gets the current position of the fill level indicator.

`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.

`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.

`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.

`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.

`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.

`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.

`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.

`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()`.

`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.

`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.

`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.

`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.

`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.)

`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".

`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".

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

Since 2.24

### enum GtkSensitivityType

    typedef enum {
      GTK_SENSITIVITY_AUTO,
      GTK_SENSITIVITY_ON,
      GTK_SENSITIVITY_OFF
    } GtkSensitivityType;

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

`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

### 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.

`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.

`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.

`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.

`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()`.

`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()`.

`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()`.

`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.

`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.

`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()`.

`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.

`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.

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

Since 2.20

## Property Details

### The `"adjustment"` property

      "adjustment"               GtkAdjustment*        : Read / Write / Construct

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

### The `"fill-level"` property

      "fill-level"               gdouble               : Read / Write

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

Default value: 1.79769e+308

Since 2.12

### The `"inverted"` property

      "inverted"                 gboolean              : Read / Write

Invert direction slider moves to increase range value.

Default value: FALSE

### The `"lower-stepper-sensitivity"` property

      "lower-stepper-sensitivity" GtkSensitivityType    : Read / Write

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

Default value: GTK_SENSITIVITY_AUTO

### The `"restrict-to-fill-level"` property

      "restrict-to-fill-level"   gboolean              : Read / Write

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()`.

Default value: TRUE

Since 2.12

### The `"round-digits"` property

      "round-digits"             gint                  : Read / Write

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

Allowed values: >= G_MAXULONG

Default value: -1

Since 2.24

### The `"show-fill-level"` property

      "show-fill-level"          gboolean              : Read / Write

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

Default value: FALSE

Since 2.12

### The `"upper-stepper-sensitivity"` property

      "upper-stepper-sensitivity" GtkSensitivityType    : Read / Write

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

Default value: GTK_SENSITIVITY_AUTO

## Style Property Details

### The `"arrow-displacement-x"` style property

      "arrow-displacement-x"     gint                  : Read

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

Default value: 0

### The `"arrow-displacement-y"` style property

      "arrow-displacement-y"     gint                  : Read

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

Default value: 0

### The `"arrow-scaling"` style property

      "arrow-scaling"            gfloat                : Read

The arrow size proportion relative to the scroll button size.

Allowed values: [0,1]

Default value: 0.5

Since 2.14

### The `"slider-width"` style property

      "slider-width"             gint                  : Read

Width of scrollbar or scale thumb.

Allowed values: >= 0

Default value: 14

### The `"stepper-size"` style property

      "stepper-size"             gint                  : Read

Length of step buttons at ends.

Allowed values: >= 0

Default value: 14

### The `"stepper-spacing"` style property

      "stepper-spacing"          gint                  : Read

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

Allowed values: >= 0

Default value: 0

### The `"trough-border"` style property

      "trough-border"            gint                  : Read

Spacing between thumb/steppers and outer trough bevel.

Allowed values: >= 0

Default value: 1

### The `"trough-under-steppers"` style property

      "trough-under-steppers"    gboolean              : Read

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

Default value: TRUE

Since 2.10

## Signal Details

### The `"adjust-bounds"` signal

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

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

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

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

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

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.

`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

Since 2.6

### The `"move-slider"` signal

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

Virtual function that moves the slider. Used for keybindings.

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

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

    void                user_function                      (GtkRange *range,
                                                            gpointer  user_data)      : Run Last

Emitted when the range value changes.

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