Scale

A GtkScale is a slider control used to select a numeric value. To use it, you’ll probably want to investigate the methods on its base class, #GtkRange, in addition to the methods for GtkScale itself. To set the value of a scale, you would normally use gtk_range_set_value(). To detect changes to the value, you would normally use the #GtkRange::value-changed signal.

Note that using the same upper and lower bounds for the #GtkScale (through the #GtkRange methods) will hide the slider itself. This is useful for applications that want to show an undeterminate value on the scale, without changing the layout of the application (such as movie or music players).

GtkScale as GtkBuildable

GtkScale supports a custom <marks> element, which can contain multiple <mark> elements. The “value” and “position” attributes have the same meaning as gtk_scale_add_mark() parameters of the same name. If the element is not empty, its content is taken as the markup to show at the mark. It can be translated with the usual ”translatable” and “context” attributes.

CSS nodes

|[ scale[.fine-tune][.marks-before][.marks-after] ├── marks.top │ ├── mark │ ┊ ├── label │ ┊ ╰── indicator ┊ ┊ │ ╰── mark ├── value ├── contents │ ╰── trough │ ├── slider │ ├── highlight │ ╰── fill ╰── marks.bottom ├── mark ┊ ├── indicator ┊ ╰── label ╰── mark ]|

GtkScale has a main CSS node with name scale and a subnode for its contents, with subnodes named trough and slider.

The main node gets the style class .fine-tune added when the scale is in 'fine-tuning' mode.

If the scale has an origin (see gtk_scale_set_has_origin()), there is a subnode with name highlight below the trough node that is used for rendering the highlighted part of the trough.

If the scale is showing a fill level (see gtk_range_set_show_fill_level()), there is a subnode with name fill below the trough node that is used for rendering the filled in part of the trough.

If marks are present, there is a marks subnode before or after the contents node, below which each mark gets a node with name mark. The marks nodes get either the .top or .bottom style class.

The mark node has a subnode named indicator. If the mark has text, it also has a subnode named label. When the mark is either above or left of the scale, the label subnode is the first when present. Otherwise, the indicator subnode is the first.

The main CSS node gets the 'marks-before' and/or 'marks-after' style classes added depending on what marks are present.

If the scale is displaying the value (see #GtkScale:draw-value), there is subnode with name value.

Constructors

this this(GtkScale* gtkScale, bool ownedRef): Sets our main struct and passes it to the parent class.
this this(GtkOrientation orientation, Adjustment adjustment): Creates a new #GtkScale.
this this(GtkOrientation orientation, double min, double max, double step): Creates a new scale widget with the given orientation that lets the user input a number between @min and @max (including @min and @max) with the increment @step. @step must be nonzero; it’s the distance the slider moves when using the arrow keys to adjust the scale value.

Members

Functions

addMark void addMark(double value, GtkPositionType position, string markup): Adds a mark at @value.
addOnFormatValue gulong addOnFormatValue(string delegate(double, Scale) dlg, ConnectFlags connectFlags): Signal which allows you to change how the scale value is displayed. Connect a signal handler which returns an allocated string representing @value. That string will then be used to display the scale's value.
clearMarks void clearMarks(): Removes any marks that have been added with gtk_scale_add_mark().
getDigits int getDigits(): Gets the number of decimal places that are displayed in the value.
getDrawValue bool getDrawValue(): Returns whether the current value is displayed as a string next to the slider.
getHasOrigin bool getHasOrigin(): Returns whether the scale has an origin.
getLayout PgLayout getLayout(): Gets the #PangoLayout used to display the scale. The returned object is owned by the scale so does not need to be freed by the caller.
getLayoutOffsets void getLayoutOffsets(int x, int y): Obtains the coordinates where the scale will draw the #PangoLayout representing the text in the scale. Remember when using the #PangoLayout function you need to convert to and from pixels using PANGO_PIXELS() or #PANGO_SCALE.
getScaleStruct GtkScale* getScaleStruct(bool transferOwnership): Get the main Gtk struct
getStruct void* getStruct(): the main Gtk struct as a void*
getValuePos GtkPositionType getValuePos(): Gets the position in which the current value is displayed.
setDigits void setDigits(int digits): Sets the number of decimal places that are displayed in the value. Also causes the value of the adjustment to be rounded to this number of digits, so the retrieved value matches the displayed one, if #GtkScale:draw-value is %TRUE when the value changes. If you want to enforce rounding the value when #GtkScale:draw-value is %FALSE, you can set #GtkRange:round-digits instead.
setDrawValue void setDrawValue(bool drawValue): Specifies whether the current value is displayed as a string next to the slider.
setHasOrigin void setHasOrigin(bool hasOrigin): If #GtkScale:has-origin is set to %TRUE (the default), the scale will highlight the part of the trough between the origin (bottom or left side) and the current value.
setValuePos void setValuePos(GtkPositionType pos): Sets the position in which the current value is displayed.

Static functions

getType GType getType()

Variables

gtkScale GtkScale* gtkScale;: the main Gtk struct

Inherited Members

From Range

gtkRange GtkRange* gtkRange;: the main Gtk struct
getRangeStruct GtkRange* getRangeStruct(bool transferOwnership): Get the main Gtk struct
getStruct void* getStruct(): the main Gtk struct as a void*
__anonymous mixin OrientableT!(GtkRange): Undocumented in source.
getType GType getType()
getAdjustment Adjustment getAdjustment(): 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.
getFillLevel double getFillLevel(): Gets the current position of the fill level indicator.
getFlippable bool getFlippable(): Gets the value set by gtk_range_set_flippable().
getInverted bool getInverted(): Gets the value set by gtk_range_set_inverted().
getLowerStepperSensitivity GtkSensitivityType getLowerStepperSensitivity(): Gets the sensitivity policy for the stepper that points to the 'lower' end of the GtkRange’s adjustment.
getMinSliderSize int getMinSliderSize(): This function is useful mainly for #GtkRange subclasses.
getRangeRect void getRangeRect(GdkRectangle rangeRect): This function returns the area that contains the range’s trough and its steppers, in widget->window coordinates.
getRestrictToFillLevel bool getRestrictToFillLevel(): Gets whether the range is restricted to the fill level.
getRoundDigits int getRoundDigits(): Gets the number of digits to round the value to when it changes. See #GtkRange::change-value.
getShowFillLevel bool getShowFillLevel(): Gets whether the range displays the fill level graphically.
getSliderRange void getSliderRange(int sliderStart, int sliderEnd): This function returns sliders range along the long dimension, in widget->window coordinates.
getSliderSizeFixed bool getSliderSizeFixed(): This function is useful mainly for #GtkRange subclasses.
getUpperStepperSensitivity GtkSensitivityType getUpperStepperSensitivity(): Gets the sensitivity policy for the stepper that points to the 'upper' end of the GtkRange’s adjustment.
getValue double getValue(): Gets the current value of the range.
setAdjustment void setAdjustment(Adjustment 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.
setFillLevel void setFillLevel(double fillLevel): Set the new position of the fill level indicator.
setFlippable void setFlippable(bool flippable): If a range is flippable, it will switch its direction if it is horizontal and its direction is %GTK_TEXT_DIR_RTL.
setIncrements void setIncrements(double step, double 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.
setInverted void setInverted(bool 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.
setLowerStepperSensitivity void setLowerStepperSensitivity(GtkSensitivityType sensitivity): Sets the sensitivity policy for the stepper that points to the 'lower' end of the GtkRange’s adjustment.
setMinSliderSize void setMinSliderSize(int minSize): Sets the minimum size of the range’s slider.
setRange void setRange(double min, double 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.)
setRestrictToFillLevel void setRestrictToFillLevel(bool restrictToFillLevel): 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.
setRoundDigits void setRoundDigits(int roundDigits): Sets the number of digits to round the value to when it changes. See #GtkRange::change-value.
setShowFillLevel void setShowFillLevel(bool showFillLevel): 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.
setSliderSizeFixed void setSliderSizeFixed(bool sizeFixed): Sets whether the range’s slider has a fixed size, or a size that depends on its adjustment’s page size.
setUpperStepperSensitivity void setUpperStepperSensitivity(GtkSensitivityType sensitivity): Sets the sensitivity policy for the stepper that points to the 'upper' end of the GtkRange’s adjustment.
setValue void setValue(double 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 #GtkRange::value-changed signal if the value changes.
addOnAdjustBounds gulong addOnAdjustBounds(void delegate(double, Range) dlg, ConnectFlags connectFlags): Emitted before clamping a value, to give the application a chance to adjust the bounds.
addOnChangeValue gulong addOnChangeValue(bool delegate(GtkScrollType, double, Range) dlg, ConnectFlags connectFlags): The #GtkRange::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.
addOnMoveSlider gulong addOnMoveSlider(void delegate(GtkScrollType, Range) dlg, ConnectFlags connectFlags): Virtual function that moves the slider. Used for keybindings.
addOnValueChanged gulong addOnValueChanged(void delegate(Range) dlg, ConnectFlags connectFlags): Emitted when the range value changes.