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, class@Gtk.Range, in addition to the methods for GtkScale itself. To set the value of a scale, you would normally use method@Gtk.Range.set_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 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 method@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.
Shortcuts and Gestures
GtkPopoverMenu supports the following keyboard shortcuts:
Arrow keys, + and - will increment or decrement by step, or by page when combined with Ctrl.
PgUp and PgDn will increment or decrement by page.
Home and End will set the minimum or maximum value.
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]
╰── sliderGtkScale 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 method@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 method@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 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
GtkScale uses the %GTK_ACCESSIBLE_ROLE_SLIDER role.
Skipped during bindings generation
parameter
x: x: Out parameter is not supported
Constructors
Creates a new GtkScale.
Creates a new scale widget with a range from @min to @max.
Properties
The accessible role of the given GtkAccessible implementation.
The adjustment that is controlled by the range.
A list of css classes applied to this widget.
Whether the widget should grab focus when it is clicked with the mouse.
Enables or disables the emission of the ::query-tooltip signal on @widget.
Whether to use the hexpand property.
The GtkLayoutManager instance to use to compute the preferred size of the widget, and allocate its children.
Margin on bottom side of widget.
Margin on start of widget, horizontally.
The orientation of the orientable.
Whether the widget will receive the default action when it is focused.
Controls whether slider movement is restricted to an upper boundary set by the fill level.
The number of digits to round the value to when it changes.
The scale factor of the widget.
Controls whether fill level indicator graphics are displayed on the trough.
Sets the text of tooltip to be the given string, which is marked up with Pango markup.
Sets the text of tooltip to be the given string.
The position in which the current value is displayed.
Whether to use the vexpand property.
Functions
Enable or disable an action installed with gtk_widget_class_install_action().
Looks up the action in the action groups associated with
Activates the default.activate action from @widget.
For widgets that can be “activated” (buttons, menu items, etc.), this function activates them.
Adds @controller to @widget so that it will receive events.
Adds a style class to @widget.
Adds a mark at @value.
Adds a widget to the list of mnemonic labels for this widget.
Queues an animation frame update and adds a callback to be called before each frame.
This function is only used by GtkWidget subclasses, to assign a size, position and (optionally) baseline to their child widgets.
Requests the user's screen reader to announce the given message.
Called by widgets as the user moves around the window using keyboard shortcuts.
Removes any marks that have been added.
Computes the bounds for @widget in the coordinate space of @target.
Computes whether a container should give this widget extra space when possible.
Translates the given @point in @widget's coordinates to coordinates relative to @target’s coordinate system.
Computes a matrix suitable to describe a transformation from
Emitted before clamping a value, to give the application a chance to adjust the bounds.
Emitted when a scroll action is performed on a range.
Signals that all holders of a reference to the widget should release the reference that they hold.
Emitted when the text direction of a widget changes.
Emitted when @widget is hidden.
Emitted if keyboard navigation fails.
Emitted when @widget is going to be mapped.
Emitted when a widget is activated via a mnemonic.
Emitted when the focus is moved.
Virtual function that moves the slider.
Emitted when the widget’s tooltip is about to be shown.
Emitted when @widget is associated with a GdkSurface.
Emitted when @widget is shown.
Emitted when the widget state changes.
Emitted when @widget is going to be unmapped.
Emitted when the GdkSurface associated with @widget is destroyed.
Emitted when the range value changes.
Creates a new PangoContext with the appropriate font map, font options, font description, and base direction for drawing text for this widget.
Creates a new PangoLayout with the appropriate font map, font description, and base direction for drawing text for this widget.
Clears the template children for the given widget.
Checks to see if a drag movement has passed the GTK drag threshold.
Retrieves the accessible parent for an accessible object.
Retrieves the accessible role of an accessible object.
Returns the baseline that has currently been allocated to @widget.
Returns the height that has currently been allocated to @widget.
Returns the width that has currently been allocated to @widget.
Gets the first ancestor of @widget with type @widget_type.
Retrieves the accessible implementation for the given GtkAccessible.
Returns the baseline that has currently been allocated to @widget.
Gets the ID of the @buildable object.
Gets the value set with gtk_widget_set_child_visible().
Gets the clipboard object for @widget.
Gets the reading direction for a particular widget.
Get the GdkDisplay for the toplevel window associated with this widget.
Retrieves the first accessible child of an accessible object.
Returns the widget’s first child.
Gets whether the GtkRange respects text direction.
Returns the current focus child of @widget.
Gets the font map of @widget.
Obtains the frame clock for a widget.
Returns the widget’s last child.
Retrieves the next accessible sibling of an accessible object
Returns the widget’s next sibling.
Retrieves the orientation of the @orientable.
Gets a PangoContext with the appropriate font map, font description, and base direction for this widget.
Query a platform state, such as focus.
Retrieves the minimum and natural size of a widget, taking into account the widget’s preference for height-for-width management.
Returns the widget’s previous sibling.
Gets the primary clipboard of @widget.
This function returns the area that contains the range’s trough, in coordinates relative to @range's origin.
Determines whether @widget is realized.
Gets whether the widget prefers a height-for-width layout or a width-for-height layout.
Returns the widget’s sensitivity.
Gets the settings object holding the settings used for this widget.
Returns the content width or height of the widget.
This function is useful mainly for GtkRange subclasses.
Returns the widget state as a flag set.
Returns the style context associated to @widget.
Fetch an object build from the template XML for @widget_type in this @widget instance.
Determines whether the widget is visible.
Returns whether @css_class is currently applied to @widget.
Determines whether @widget is the current default widget within its toplevel.
Determines if the widget should show a visible indication that it has the global input focus.
Returns whether the widget is currently being destroyed.
Creates and initializes child widgets defined in templates.
Inserts @group into @widget.
Inserts @widget into the child widget list of @parent.
Inserts @widget into the child widget list of @parent.
Determines whether @widget is somewhere inside @ancestor, possibly with intermediate containers.
Determines whether @widget can be drawn to.
Returns the widget’s effective sensitivity.
Emits the ::keynav-failed signal on the widget.
Returns the widgets for which this widget is the target of a mnemonic.
Emits the ::mnemonic-activate signal.
Returns a GListModel to track the children of @widget.
Returns a GListModel to track the class@Gtk.EventControllers of @widget.
Flags the widget for a rerun of the vfunc@Gtk.Widget.size_allocate function.
Flags a widget to have its size renegotiated.
Removes @controller from @widget, so that it doesn't process events anymore.
Removes a style from @widget.
Removes a widget from the list of mnemonic labels for this widget.
Removes a tick callback previously registered with gtk_widget_add_tick_callback().
Resets the accessible @property to its default value.
Resets the accessible @relation to its default value.
Resets the accessible @state to its default value.
Sets the parent and sibling of an accessible object.
Sets whether @widget should be mapped along with its parent.
Sets a named cursor to be shown when pointer devices point towards @widget.
Sets the reading direction on a particular widget.
Sets whether the GtkRange respects text direction.
Set @child as the current focus child of @widget.
Sets the font map to use for Pango rendering.
Sets the step and page sizes for the range.
Set all margins to the same value.
Set start and end margin to horizontal and top and bottom margin to vertical
Set margins.
Sets the orientation of the @orientable.
Sets the sensitivity of a widget.
Sets the minimum size of a widget.
Sets whether the range’s slider has a fixed size, or a size that depends on its adjustment’s page size.
Turns on flag values in the current widget state.
Sets the visibility state of @widget.
Returns whether @widget should contribute to the measuring and allocation of its parent.
Triggers a tooltip query on the display where the toplevel of @widget is located.
Turns off flag values for the current widget state.
Updates the next accessible sibling of @self.