class Gtk::Scale

Overview

A Gtk::Scale is a slider control used to select a numeric value.

An example Gtk::Scale

To use it, you’ll probably want to investigate the methods on its base class, #Gtk::Range, in addition to the methods for Gtk::Scale itself. To set the value of a scale, you would normally use Gtk::Range#value=. To detect changes to the value, you would normally use the [signal@Gtk.Range::value-changed] signal.

Note that using the same upper and lower bounds for the Gtk::Scale (through the Gtk::Range 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).

Gtk::Scale as Gtk::Buildable

Gtk::Scale supports a custom 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]
├── [value][.top][.right][.bottom][.left]
├── marks.top
│   ├── mark
│   ┊    ├── [label]
│   ┊    ╰── indicator
┊   ┊
│   ╰── mark
├── marks.bottom
│   ├── mark
│   ┊    ├── indicator
│   ┊    ╰── [label]
┊   ┊
│   ╰── mark
╰── trough
    ├── [fill]
    ├── [highlight]
    ╰── slider

Gtk::Scale 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#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#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 trough 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 [property@Gtk.Scale:draw-value]), there is subnode with name value. This node will get the .top or .bottom style classes similar to the marks node.

Accessibility

Gtk::Scale uses the %GTK_ACCESSIBLE_ROLE_SLIDER role.

Included Modules

Defined in:

lib/gi-crystal/src/auto/gtk-4.0/scale.cr

Constructors

Class Method Summary

Instance Method Summary

Instance methods inherited from module Gtk::Orientable

orientation : Gtk::Orientation orientation, orientation=(orientation : Gtk::Orientation) : Nil orientation=, to_unsafe to_unsafe

Class methods inherited from module Gtk::Orientable

g_type : UInt64 g_type

Instance methods inherited from module Gtk::ConstraintTarget

to_unsafe to_unsafe

Class methods inherited from module Gtk::ConstraintTarget

g_type : UInt64 g_type

Instance methods inherited from module Gtk::Buildable

buildable_id : String? buildable_id, to_unsafe to_unsafe

Class methods inherited from module Gtk::Buildable

g_type : UInt64 g_type

Instance methods inherited from module Gtk::Accessible

accessible_role : Gtk::AccessibleRole accessible_role, accessible_role=(value : Gtk::AccessibleRole) : Gtk::AccessibleRole accessible_role=, reset_property(property : Gtk::AccessibleProperty) : Nil reset_property, reset_relation(relation : Gtk::AccessibleRelation) : Nil reset_relation, reset_state(state : Gtk::AccessibleState) : Nil reset_state, to_unsafe to_unsafe, update_property(properties : Enumerable(Gtk::AccessibleProperty), values : Enumerable(_)) : Nil update_property, update_relation(relations : Enumerable(Gtk::AccessibleRelation), values : Enumerable(_)) : Nil update_relation, update_state(states : Enumerable(Gtk::AccessibleState), values : Enumerable(_)) : Nil update_state

Class methods inherited from module Gtk::Accessible

g_type : UInt64 g_type

Instance methods inherited from class Gtk::Range

adjust_bounds_signal adjust_bounds_signal, adjustment : Gtk::Adjustment adjustment, adjustment=(adjustment : Gtk::Adjustment) : Nil
adjustment=(value : Gtk::Adjustment?) : Gtk::Adjustment? adjustment=, change_value_signal change_value_signal, fill_level : Float64 fill_level, fill_level=(fill_level : Float64) : Nil fill_level=, flippable : Bool flippable, flippable=(flippable : Bool) : Nil flippable=, inverted : Bool inverted, inverted=(setting : Bool) : Nil inverted=, inverted? : Bool inverted?, move_slider_signal move_slider_signal, range_rect : Gdk::Rectangle range_rect, restrict_to_fill_level : Bool restrict_to_fill_level, restrict_to_fill_level=(restrict_to_fill_level : Bool) : Nil restrict_to_fill_level=, restrict_to_fill_level? : Bool restrict_to_fill_level?, round_digits : Int32 round_digits, round_digits=(round_digits : Int32) : Nil round_digits=, set_increments(step : Float64, page : Float64) : Nil set_increments, set_range(min : Float64, max : Float64) : Nil set_range, show_fill_level : Bool show_fill_level, show_fill_level=(show_fill_level : Bool) : Nil show_fill_level=, show_fill_level? : Bool show_fill_level?, slider_range : Nil slider_range, slider_size_fixed : Bool slider_size_fixed, slider_size_fixed=(size_fixed : Bool) : Nil slider_size_fixed=, value : Float64 value, value=(value : Float64) : Nil value=, value_changed_signal value_changed_signal

Constructor methods inherited from class Gtk::Range

new
new(*, accessible_role : Gtk::AccessibleRole? = nil, adjustment : Gtk::Adjustment? = nil, can_focus : Bool? = nil, can_target : Bool? = nil, css_classes : Enumerable(String)? = nil, css_name : String? = nil, cursor : Gdk::Cursor? = nil, fill_level : Float64? = nil, focus_on_click : Bool? = nil, focusable : Bool? = nil, halign : Gtk::Align? = nil, has_default : Bool? = nil, has_focus : Bool? = nil, has_tooltip : Bool? = nil, height_request : Int32? = nil, hexpand : Bool? = nil, hexpand_set : Bool? = nil, inverted : Bool? = nil, layout_manager : Gtk::LayoutManager? = nil, margin_bottom : Int32? = nil, margin_end : Int32? = nil, margin_start : Int32? = nil, margin_top : Int32? = nil, name : String? = nil, opacity : Float64? = nil, orientation : Gtk::Orientation? = nil, overflow : Gtk::Overflow? = nil, parent : Gtk::Widget? = nil, receives_default : Bool? = nil, restrict_to_fill_level : Bool? = nil, root : Gtk::Root? = nil, round_digits : Int32? = nil, scale_factor : Int32? = nil, sensitive : Bool? = nil, show_fill_level : Bool? = nil, tooltip_markup : String? = nil, tooltip_text : String? = nil, valign : Gtk::Align? = nil, vexpand : Bool? = nil, vexpand_set : Bool? = nil, visible : Bool? = nil, width_request : Int32? = nil) new

Class methods inherited from class Gtk::Range

g_type : UInt64 g_type

Instance methods inherited from module Gtk::Orientable

orientation : Gtk::Orientation orientation, orientation=(orientation : Gtk::Orientation) : Nil orientation=, to_unsafe to_unsafe

Class methods inherited from module Gtk::Orientable

g_type : UInt64 g_type

Instance methods inherited from module Gtk::ConstraintTarget

to_unsafe to_unsafe

Class methods inherited from module Gtk::ConstraintTarget

g_type : UInt64 g_type

Instance methods inherited from module Gtk::Buildable

buildable_id : String? buildable_id, to_unsafe to_unsafe

Class methods inherited from module Gtk::Buildable

g_type : UInt64 g_type

Instance methods inherited from module Gtk::Accessible

accessible_role : Gtk::AccessibleRole accessible_role, accessible_role=(value : Gtk::AccessibleRole) : Gtk::AccessibleRole accessible_role=, reset_property(property : Gtk::AccessibleProperty) : Nil reset_property, reset_relation(relation : Gtk::AccessibleRelation) : Nil reset_relation, reset_state(state : Gtk::AccessibleState) : Nil reset_state, to_unsafe to_unsafe, update_property(properties : Enumerable(Gtk::AccessibleProperty), values : Enumerable(_)) : Nil update_property, update_relation(relations : Enumerable(Gtk::AccessibleRelation), values : Enumerable(_)) : Nil update_relation, update_state(states : Enumerable(Gtk::AccessibleState), values : Enumerable(_)) : Nil update_state

Class methods inherited from module Gtk::Accessible

g_type : UInt64 g_type

Instance methods inherited from class Gtk::Widget

action_set_enabled(action_name : String, enabled : Bool) : Nil action_set_enabled, activate : Bool activate, activate_action(name : String, args : _?) : Bool activate_action, activate_default : Nil activate_default, add_controller(controller : Gtk::EventController) : Nil add_controller, add_css_class(css_class : String) : Nil add_css_class, add_mnemonic_label(label : Gtk::Widget) : Nil add_mnemonic_label, add_tick_callback(callback : Gtk::TickCallback) : UInt32 add_tick_callback, allocate(width : Int32, height : Int32, baseline : Int32, transform : Gsk::Transform?) : Nil allocate, allocated_baseline : Int32 allocated_baseline, allocated_height : Int32 allocated_height, allocated_width : Int32 allocated_width, allocation : Gdk::Rectangle allocation, ancestor(widget_type : UInt64) : Gtk::Widget? ancestor, can_focus : Bool can_focus, can_focus=(can_focus : Bool) : Nil can_focus=, can_focus? : Bool can_focus?, can_target : Bool can_target, can_target=(can_target : Bool) : Nil can_target=, can_target? : Bool can_target?, child_focus(direction : Gtk::DirectionType) : Bool child_focus, child_visible : Bool child_visible, child_visible=(child_visible : Bool) : Nil child_visible=, clipboard : Gdk::Clipboard clipboard, compute_bounds(target : Gtk::Widget) : Graphene::Rect compute_bounds, compute_expand(orientation : Gtk::Orientation) : Bool compute_expand, compute_point(target : Gtk::Widget, point : Graphene::Point) : Graphene::Point compute_point, compute_transform(target : Gtk::Widget) : Graphene::Matrix compute_transform, contains(x : Float64, y : Float64) : Bool contains, create_pango_context : Pango::Context create_pango_context, create_pango_layout(text : String?) : Pango::Layout create_pango_layout, css_classes : Enumerable(String) css_classes, css_classes=(classes : Enumerable(String)) : Nil css_classes=, css_name : String css_name, css_name=(value : String) : String css_name=, cursor : Gdk::Cursor? cursor, cursor=(cursor : Gdk::Cursor?) : Nil cursor=, cursor_from_name=(name : String?) : Nil cursor_from_name=, destroy_signal destroy_signal, direction : Gtk::TextDirection direction, direction=(dir : Gtk::TextDirection) : Nil direction=, direction_changed_signal direction_changed_signal, display : Gdk::Display display, dispose_template(widget_type : UInt64) : Nil dispose_template, drag_check_threshold(start_x : Int32, start_y : Int32, current_x : Int32, current_y : Int32) : Bool drag_check_threshold, error_bell : Nil error_bell, first_child : Gtk::Widget? first_child, focus_child : Gtk::Widget? focus_child, focus_child=(child : Gtk::Widget?) : Nil focus_child=, focus_on_click : Bool focus_on_click, focus_on_click=(focus_on_click : Bool) : Nil focus_on_click=, focus_on_click? : Bool focus_on_click?, focusable : Bool focusable, focusable=(focusable : Bool) : Nil focusable=, focusable? : Bool focusable?, font_map : Pango::FontMap? font_map, font_map=(font_map : Pango::FontMap?) : Nil font_map=, font_options : Cairo::FontOptions? font_options, font_options=(options : Cairo::FontOptions?) : Nil font_options=, frame_clock : Gdk::FrameClock? frame_clock, grab_focus : Bool grab_focus, halign : Gtk::Align halign, halign=(align : Gtk::Align) : Nil halign=, has_css_class(css_class : String) : Bool has_css_class, has_default : Bool has_default, has_default? : Bool has_default?, has_focus : Bool has_focus, has_focus? : Bool has_focus?, has_tooltip : Bool has_tooltip, has_tooltip=(has_tooltip : Bool) : Nil has_tooltip=, has_tooltip? : Bool has_tooltip?, has_visible_focus : Bool has_visible_focus, height : Int32 height, height_request : Int32 height_request, height_request=(value : Int32) : Int32 height_request=, hexpand : Bool hexpand, hexpand=(expand : Bool) : Nil hexpand=, hexpand? : Bool hexpand?, hexpand_set : Bool hexpand_set, hexpand_set=(set : Bool) : Nil hexpand_set=, hexpand_set? : Bool hexpand_set?, hide : Nil hide, hide_signal hide_signal, in_destruction : Bool in_destruction, init_template : Nil init_template, insert_action_group(name : String, group : Gio::ActionGroup?) : Nil insert_action_group, insert_after(parent : Gtk::Widget, previous_sibling : Gtk::Widget?) : Nil insert_after, insert_before(parent : Gtk::Widget, next_sibling : Gtk::Widget?) : Nil insert_before, is_ancestor(ancestor : Gtk::Widget) : Bool is_ancestor, is_drawable : Bool is_drawable, is_focus : Bool is_focus, is_sensitive : Bool is_sensitive, is_visible : Bool is_visible, keynav_failed(direction : Gtk::DirectionType) : Bool keynav_failed, keynav_failed_signal keynav_failed_signal, last_child : Gtk::Widget? last_child, layout_manager : Gtk::LayoutManager? layout_manager, layout_manager=(layout_manager : Gtk::LayoutManager?) : Nil layout_manager=, list_mnemonic_labels : GLib::List list_mnemonic_labels, map : Nil map, map_signal map_signal, mapped : Bool mapped, margin_bottom : Int32 margin_bottom, margin_bottom=(margin : Int32) : Nil margin_bottom=, margin_end : Int32 margin_end, margin_end=(margin : Int32) : Nil margin_end=, margin_start : Int32 margin_start, margin_start=(margin : Int32) : Nil margin_start=, margin_top : Int32 margin_top, margin_top=(margin : Int32) : Nil margin_top=, measure(orientation : Gtk::Orientation, for_size : Int32) : Nil measure, mnemonic_activate(group_cycling : Bool) : Bool mnemonic_activate, mnemonic_activate_signal mnemonic_activate_signal, move_focus_signal move_focus_signal, name : String name, name=(name : String) : Nil name=, native : Gtk::Native? native, next_sibling : Gtk::Widget? next_sibling, observe_children : Gio::ListModel observe_children, observe_controllers : Gio::ListModel observe_controllers, opacity : Float64 opacity, opacity=(opacity : Float64) : Nil opacity=, overflow : Gtk::Overflow overflow, overflow=(overflow : Gtk::Overflow) : Nil overflow=, pango_context : Pango::Context pango_context, parent : Gtk::Widget? parent, parent=(parent : Gtk::Widget) : Nil parent=, pick(x : Float64, y : Float64, flags : Gtk::PickFlags) : Gtk::Widget? pick, preferred_size : Gtk::Requisition preferred_size, prev_sibling : Gtk::Widget? prev_sibling, primary_clipboard : Gdk::Clipboard primary_clipboard, query_tooltip_signal query_tooltip_signal, queue_allocate : Nil queue_allocate, queue_draw : Nil queue_draw, queue_resize : Nil queue_resize, realize : Nil realize, realize_signal realize_signal, realized : Bool realized, receives_default : Bool receives_default, receives_default=(receives_default : Bool) : Nil receives_default=, receives_default? : Bool receives_default?, remove_controller(controller : Gtk::EventController) : Nil remove_controller, remove_css_class(css_class : String) : Nil remove_css_class, remove_mnemonic_label(label : Gtk::Widget) : Nil remove_mnemonic_label, remove_tick_callback(id : UInt32) : Nil remove_tick_callback, request_mode : Gtk::SizeRequestMode request_mode, root : Gtk::Root? root, scale_factor : Int32 scale_factor, sensitive : Bool sensitive, sensitive=(sensitive : Bool) : Nil sensitive=, sensitive? : Bool sensitive?, set_size_request(width : Int32, height : Int32) : Nil set_size_request, set_state_flags(flags : Gtk::StateFlags, clear : Bool) : Nil set_state_flags, settings : Gtk::Settings settings, should_layout : Bool should_layout, show : Nil show, show_signal show_signal, size(orientation : Gtk::Orientation) : Int32 size, size_allocate(allocation : Gdk::Rectangle, baseline : Int32) : Nil size_allocate, size_request : Nil size_request, snapshot_child(child : Gtk::Widget, snapshot : Gtk::Snapshot) : Nil snapshot_child, state_flags : Gtk::StateFlags state_flags, state_flags_changed_signal state_flags_changed_signal, style_context : Gtk::StyleContext style_context, tooltip_markup : String? tooltip_markup, tooltip_markup=(value : String) : String
tooltip_markup=(markup : String?) : Nil tooltip_markup=, tooltip_text : String? tooltip_text, tooltip_text=(value : String) : String
tooltip_text=(text : String?) : Nil tooltip_text=, translate_coordinates(dest_widget : Gtk::Widget, src_x : Float64, src_y : Float64) : Bool translate_coordinates, trigger_tooltip_query : Nil trigger_tooltip_query, unmap : Nil unmap, unmap_signal unmap_signal, unparent : Nil unparent, unrealize : Nil unrealize, unrealize_signal unrealize_signal, unset_state_flags(flags : Gtk::StateFlags) : Nil unset_state_flags, valign : Gtk::Align valign, valign=(align : Gtk::Align) : Nil valign=, vexpand : Bool vexpand, vexpand=(expand : Bool) : Nil vexpand=, vexpand? : Bool vexpand?, vexpand_set : Bool vexpand_set, vexpand_set=(set : Bool) : Nil vexpand_set=, vexpand_set? : Bool vexpand_set?, visible : Bool visible, visible=(visible : Bool) : Nil visible=, visible? : Bool visible?, width : Int32 width, width_request : Int32 width_request, width_request=(value : Int32) : Int32 width_request=

Constructor methods inherited from class Gtk::Widget

new
new(*, accessible_role : Gtk::AccessibleRole? = nil, can_focus : Bool? = nil, can_target : Bool? = nil, css_classes : Enumerable(String)? = nil, css_name : String? = nil, cursor : Gdk::Cursor? = nil, focus_on_click : Bool? = nil, focusable : Bool? = nil, halign : Gtk::Align? = nil, has_default : Bool? = nil, has_focus : Bool? = nil, has_tooltip : Bool? = nil, height_request : Int32? = nil, hexpand : Bool? = nil, hexpand_set : Bool? = nil, layout_manager : Gtk::LayoutManager? = nil, margin_bottom : Int32? = nil, margin_end : Int32? = nil, margin_start : Int32? = nil, margin_top : Int32? = nil, name : String? = nil, opacity : Float64? = nil, overflow : Gtk::Overflow? = nil, parent : Gtk::Widget? = nil, receives_default : Bool? = nil, root : Gtk::Root? = nil, scale_factor : Int32? = nil, sensitive : Bool? = nil, tooltip_markup : String? = nil, tooltip_text : String? = nil, valign : Gtk::Align? = nil, vexpand : Bool? = nil, vexpand_set : Bool? = nil, visible : Bool? = nil, width_request : Int32? = nil) new

Class methods inherited from class Gtk::Widget

default_direction : Gtk::TextDirection default_direction, default_direction=(dir : Gtk::TextDirection) : Nil default_direction=, g_type : UInt64 g_type

Instance methods inherited from module Gtk::ConstraintTarget

to_unsafe to_unsafe

Class methods inherited from module Gtk::ConstraintTarget

g_type : UInt64 g_type

Instance methods inherited from module Gtk::Buildable

buildable_id : String? buildable_id, to_unsafe to_unsafe

Class methods inherited from module Gtk::Buildable

g_type : UInt64 g_type

Instance methods inherited from module Gtk::Accessible

accessible_role : Gtk::AccessibleRole accessible_role, accessible_role=(value : Gtk::AccessibleRole) : Gtk::AccessibleRole accessible_role=, reset_property(property : Gtk::AccessibleProperty) : Nil reset_property, reset_relation(relation : Gtk::AccessibleRelation) : Nil reset_relation, reset_state(state : Gtk::AccessibleState) : Nil reset_state, to_unsafe to_unsafe, update_property(properties : Enumerable(Gtk::AccessibleProperty), values : Enumerable(_)) : Nil update_property, update_relation(relations : Enumerable(Gtk::AccessibleRelation), values : Enumerable(_)) : Nil update_relation, update_state(states : Enumerable(Gtk::AccessibleState), values : Enumerable(_)) : Nil update_state

Class methods inherited from module Gtk::Accessible

g_type : UInt64 g_type

Constructor methods inherited from class GObject::InitiallyUnowned

new new

Class methods inherited from class GObject::InitiallyUnowned

g_type : UInt64 g_type

Instance methods inherited from class GObject::Object

bind_property(source_property : String, target : GObject::Object, target_property : String, flags : GObject::BindingFlags) : GObject::Binding bind_property, bind_property_full(source_property : String, target : GObject::Object, target_property : String, flags : GObject::BindingFlags, transform_to : GObject::Closure, transform_from : GObject::Closure) : GObject::Binding bind_property_full, data(key : String) : Pointer(Void)? data, finalize finalize, freeze_notify : Nil freeze_notify, getv(names : Enumerable(String), values : Enumerable(_)) : Nil getv, notify(property_name : String) : Nil notify, notify_by_pspec(pspec : GObject::ParamSpec) : Nil notify_by_pspec, notify_signal notify_signal, property(property_name : String, value : _) : Nil property, qdata(quark : UInt32) : Pointer(Void)? qdata, ref_count : UInt32 ref_count, run_dispose : Nil run_dispose, set_data(key : String, data : Pointer(Void)?) : Nil set_data, set_property(property_name : String, value : _) : Nil set_property, steal_data(key : String) : Pointer(Void)? steal_data, steal_qdata(quark : UInt32) : Pointer(Void)? steal_qdata, thaw_notify : Nil thaw_notify, to_unsafe : Pointer(Void) to_unsafe, watch_closure(closure : GObject::Closure) : Nil watch_closure

Constructor methods inherited from class GObject::Object

cast(obj : GObject::Object) : self cast, cast?(obj : GObject::Object) : self? cast?, new(pointer : Pointer(Void), transfer : GICrystal::Transfer)
new new, newv(object_type : UInt64, parameters : Enumerable(GObject::Parameter)) : self newv

Class methods inherited from class GObject::Object

compat_control(what : UInt64, data : Pointer(Void)?) : UInt64 compat_control, g_type : UInt64 g_type, interface_find_property(g_iface : GObject::TypeInterface, property_name : String) : GObject::ParamSpec interface_find_property, interface_list_properties(g_iface : GObject::TypeInterface) : Enumerable(GObject::ParamSpec) interface_list_properties

Constructor Detail

def self.new(orientation : Gtk::Orientation, adjustment : Gtk::Adjustment?) : self #

Creates a new Gtk::Scale.


def self.new #

Initialize a new Scale.


def self.new(*, accessible_role : Gtk::AccessibleRole? = nil, adjustment : Gtk::Adjustment? = nil, can_focus : Bool? = nil, can_target : Bool? = nil, css_classes : Enumerable(String)? = nil, css_name : String? = nil, cursor : Gdk::Cursor? = nil, digits : Int32? = nil, draw_value : Bool? = nil, fill_level : Float64? = nil, focus_on_click : Bool? = nil, focusable : Bool? = nil, halign : Gtk::Align? = nil, has_default : Bool? = nil, has_focus : Bool? = nil, has_origin : Bool? = nil, has_tooltip : Bool? = nil, height_request : Int32? = nil, hexpand : Bool? = nil, hexpand_set : Bool? = nil, inverted : Bool? = nil, layout_manager : Gtk::LayoutManager? = nil, margin_bottom : Int32? = nil, margin_end : Int32? = nil, margin_start : Int32? = nil, margin_top : Int32? = nil, name : String? = nil, opacity : Float64? = nil, orientation : Gtk::Orientation? = nil, overflow : Gtk::Overflow? = nil, parent : Gtk::Widget? = nil, receives_default : Bool? = nil, restrict_to_fill_level : Bool? = nil, root : Gtk::Root? = nil, round_digits : Int32? = nil, scale_factor : Int32? = nil, sensitive : Bool? = nil, show_fill_level : Bool? = nil, tooltip_markup : String? = nil, tooltip_text : String? = nil, valign : Gtk::Align? = nil, value_pos : Gtk::PositionType? = nil, vexpand : Bool? = nil, vexpand_set : Bool? = nil, visible : Bool? = nil, width_request : Int32? = nil) #

def self.new_with_range(orientation : Gtk::Orientation, min : Float64, max : Float64, step : Float64) : self #

Creates a new scale widget with a range from @min to @max.

The returns scale will have the given orientation and will let 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.

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::Scale#digits= to correct it.


Class Method Detail

def self.g_type : UInt64 #

Returns the type id (GType) registered in GLib type system.


Instance Method Detail

def add_mark(value : Float64, position : Gtk::PositionType, markup : String?) : Nil #

Adds a mark at @value.

A mark is indicated visually by drawing a tick mark next to the scale, and GTK makes it easy for the user to position the scale exactly at the marks value.

If @markup is not nil, text is shown next to the tick mark.

To remove marks from a scale, use Gtk::Scale#clear_marks.


def clear_marks : Nil #

Removes any marks that have been added.


def digits : Int32 #

Gets the number of decimal places that are displayed in the value.


def digits=(digits : Int32) : Nil #

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 [property@Gtk::Scale:draw-value] is true when the value changes. If you want to enforce rounding the value when [property@Gtk::Scale:draw-value] is false, you can set [property@Gtk::Range:round-digits] instead.

Note that rounding to a small number of digits can interfere with the smooth autoscrolling that is built into Gtk::Scale. As an alternative, you can use Gtk::Scale#format_value_func= to format the displayed value yourself.


def draw_value : Bool #

Returns whether the current value is displayed as a string next to the slider.


def draw_value=(draw_value : Bool) : Nil #

Specifies whether the current value is displayed as a string next to the slider.


def draw_value? : Bool #

def format_value_func=(func : Gtk::ScaleFormatValueFunc?) : Nil #

@func allows you to change how the scale value is displayed.

The given function will return an allocated string representing @value. That string will then be used to display the scale's value.

If #NULL is passed as @func, the value will be displayed on its own, rounded according to the value of the Gtk::Scale::digits property.


def has_origin : Bool #

Returns whether the scale has an origin.


def has_origin=(has_origin : Bool) : Nil #

Sets whether the scale has an origin.

If [property@Gtk::Scale: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.


def has_origin? : Bool #

def layout : Pango::Layout? #

Gets the Pango::Layout used to display the scale.

The returned object is owned by the scale so does not need to be freed by the caller.


def layout_offsets : Nil #

Obtains the coordinates where the scale will draw the Pango::Layout representing the text in the scale.

Remember when using the Pango::Layout function you need to convert to and from pixels using PANGO_PIXELS() or PANGO_SCALE.

If the [property@Gtk::Scale:draw-value] property is false, the return values are undefined.


def value_pos : Gtk::PositionType #

Gets the position in which the current value is displayed.


def value_pos=(pos : Gtk::PositionType) : Nil #

Sets the position in which the current value is displayed.