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GtkRange

GtkRange — Base class for widgets which visualize an adjustment

Object Hierarchy

  GObject
   +----GInitiallyUnowned
         +----GtkObject
               +----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
  "show-fill-level"          gboolean              : Read / Write
  "update-policy"            GtkUpdateType         : Read / Write
  "upper-stepper-sensitivity" GtkSensitivityType    : Read / Write

Signals

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

Description

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

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

GtkRange

typedef struct _GtkRange 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

gtk_range_set_update_policy ()

void                gtk_range_set_update_policy         (GtkRange *range,
                                                         GtkUpdateType policy);

Sets the update policy for the range. GTK_UPDATE_CONTINUOUS means that anytime the range slider is moved, the range value will change and the value_changed signal will be emitted. GTK_UPDATE_DELAYED means that the value will be updated after a brief timeout where no slider motion occurs, so updates are spaced by a short time rather than continuous. GTK_UPDATE_DISCONTINUOUS means that the value will only be updated when the user releases the button and ends the slider drag operation.

range :

a GtkRange

policy :

update policy

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_update_policy ()

GtkUpdateType       gtk_range_get_update_policy         (GtkRange *range);

Gets the update policy of range. See gtk_range_set_update_policy().

range :

a GtkRange

Returns :

the current update policy

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_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_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

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

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 "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 "update-policy" property

  "update-policy"            GtkUpdateType         : Read / Write

How the range should be updated on the screen.

Default value: GTK_UPDATE_CONTINUOUS


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 "activate-slider" style property

  "activate-slider"          gboolean              : Read

With this option set to TRUE, sliders will be drawn ACTIVE and with shadow IN while they are dragged.

Default value: FALSE


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 setting this value to anything > 0 will automatically set the trough-under-steppers style property to TRUE as well. Also, 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-side-details" style property

  "trough-side-details"      gboolean              : Read

When TRUE, the parts of the trough on the two sides of the slider are drawn with different details.

Default value: FALSE

Since 2.10


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. Note that setting the "stepper-spacing" style property to any value > 0 will automatically enable trough-under-steppers too.

Default value: TRUE

Since 2.10

Signal Details

The "adjust-bounds" signal

void                user_function                      (GtkRange *range,
                                                        gdouble   arg1,
                                                        gpointer  user_data)      : Run Last

range :

the object which received the signal.

arg1 :

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 ::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 range->round_digits.

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

range :

the range that received the signal

scroll :

the type of scroll action that was performed

value :

the new value resulting from the scroll action

returns :

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

user_data :

user data set when the signal handler was connected.

Since 2.6


The "move-slider" signal

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

Virtual function that moves the slider. Used for keybindings.

range :

the GtkRange

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

user_data :

user data set when the signal handler was connected.