// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files.git)
// DO NOT EDIT

use crate::Accessible;
use crate::AccessibleRole;
use crate::Adjustment;
use crate::Align;
use crate::Buildable;
use crate::ConstraintTarget;
use crate::LayoutManager;
use crate::Orientable;
use crate::Orientation;
use crate::Overflow;
use crate::PositionType;
use crate::Range;
use crate::Widget;
use glib::object::Cast;
use glib::object::IsA;
use glib::signal::connect_raw;
use glib::signal::SignalHandlerId;
use glib::translate::*;
use glib::StaticType;
use glib::ToValue;
use std::boxed::Box as Box_;
use std::fmt;
use std::mem;
use std::mem::transmute;

glib::wrapper! {
    /// A [`Scale`][crate::Scale] is a slider control used to select a numeric value.
    ///
    /// ![An example GtkScale](scales.png)
    ///
    /// To use it, you’ll probably want to investigate the methods on its base
    /// class, [`Range`][crate::Range], in addition to the methods for [`Scale`][crate::Scale] itself.
    /// To set the value of a scale, you would normally use [``RangeExt::set_value()``][crate::prelude::`RangeExt::set_value()`].
    /// To detect changes to the value, you would normally use the
    /// `signal::Range::value-changed` signal.
    ///
    /// Note that using the same upper and lower bounds for the [`Scale`][crate::Scale] (through
    /// the [`Range`][crate::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).
    ///
    /// # GtkScale as GtkBuildable
    ///
    /// [`Scale`][crate::Scale] supports a custom `<marks>` element, which can contain multiple
    /// <mark\> elements. The “value” and “position” attributes have the same
    /// meaning as [``ScaleExt::add_mark()``][crate::prelude::`ScaleExt::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
    ///
    /// ```text
    /// 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
    /// ```
    ///
    /// [`Scale`][crate::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 [``ScaleExt::set_has_origin()``][crate::prelude::`ScaleExt::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 [``RangeExt::set_show_fill_level()``][crate::prelude::`RangeExt::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::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
    ///
    /// [`Scale`][crate::Scale] uses the [`AccessibleRole::Slider`][crate::AccessibleRole::Slider] role.
    ///
    /// # Implements
    ///
    /// [`ScaleExt`][trait@crate::prelude::ScaleExt], [`RangeExt`][trait@crate::prelude::RangeExt], [`WidgetExt`][trait@crate::prelude::WidgetExt], [`trait@glib::ObjectExt`], [`AccessibleExt`][trait@crate::prelude::AccessibleExt], [`BuildableExt`][trait@crate::prelude::BuildableExt], [`ConstraintTargetExt`][trait@crate::prelude::ConstraintTargetExt], [`OrientableExt`][trait@crate::prelude::OrientableExt], [`ScaleExtManual`][trait@crate::prelude::ScaleExtManual], [`WidgetExtManual`][trait@crate::prelude::WidgetExtManual], [`AccessibleExtManual`][trait@crate::prelude::AccessibleExtManual]
    #[doc(alias = "GtkScale")]
    pub struct Scale(Object<ffi::GtkScale, ffi::GtkScaleClass>) @extends Range, Widget, @implements Accessible, Buildable, ConstraintTarget, Orientable;

    match fn {
        type_ => || ffi::gtk_scale_get_type(),
    }
}

impl Scale {
    /// Creates a new [`Scale`][crate::Scale].
    /// ## `orientation`
    /// the scale’s orientation.
    /// ## `adjustment`
    /// the [`Adjustment`][crate::Adjustment] which sets
    ///  the range of the scale, or [`None`] to create a new adjustment.
    ///
    /// # Returns
    ///
    /// a new [`Scale`][crate::Scale]
    #[doc(alias = "gtk_scale_new")]
    pub fn new<P: IsA<Adjustment>>(orientation: Orientation, adjustment: Option<&P>) -> Scale {
        assert_initialized_main_thread!();
        unsafe {
            Widget::from_glib_none(ffi::gtk_scale_new(
                orientation.into_glib(),
                adjustment.map(|p| p.as_ref()).to_glib_none().0,
            ))
            .unsafe_cast()
        }
    }

    /// 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 [``ScaleExt::set_digits()``][crate::prelude::`ScaleExt::set_digits()`] to correct it.
    /// ## `orientation`
    /// the scale’s orientation.
    /// ## `min`
    /// minimum value
    /// ## `max`
    /// maximum value
    /// ## `step`
    /// step increment (tick size) used with keyboard shortcuts
    ///
    /// # Returns
    ///
    /// a new [`Scale`][crate::Scale]
    #[doc(alias = "gtk_scale_new_with_range")]
    #[doc(alias = "new_with_range")]
    pub fn with_range(orientation: Orientation, min: f64, max: f64, step: f64) -> Scale {
        assert_initialized_main_thread!();
        unsafe {
            Widget::from_glib_none(ffi::gtk_scale_new_with_range(
                orientation.into_glib(),
                min,
                max,
                step,
            ))
            .unsafe_cast()
        }
    }

    // rustdoc-stripper-ignore-next
    /// Creates a new builder-pattern struct instance to construct [`Scale`] objects.
    ///
    /// This method returns an instance of [`ScaleBuilder`] which can be used to create [`Scale`] objects.
    pub fn builder() -> ScaleBuilder {
        ScaleBuilder::default()
    }
}

impl Default for Scale {
    fn default() -> Self {
        glib::object::Object::new::<Self>(&[])
            .expect("Can't construct Scale object with default parameters")
    }
}

#[derive(Clone, Default)]
// rustdoc-stripper-ignore-next
/// A [builder-pattern] type to construct [`Scale`] objects.
///
/// [builder-pattern]: https://doc.rust-lang.org/1.0.0/style/ownership/builders.html
pub struct ScaleBuilder {
    digits: Option<i32>,
    draw_value: Option<bool>,
    has_origin: Option<bool>,
    value_pos: Option<PositionType>,
    adjustment: Option<Adjustment>,
    fill_level: Option<f64>,
    inverted: Option<bool>,
    restrict_to_fill_level: Option<bool>,
    round_digits: Option<i32>,
    show_fill_level: Option<bool>,
    can_focus: Option<bool>,
    can_target: Option<bool>,
    css_classes: Option<Vec<String>>,
    css_name: Option<String>,
    cursor: Option<gdk::Cursor>,
    focus_on_click: Option<bool>,
    focusable: Option<bool>,
    halign: Option<Align>,
    has_tooltip: Option<bool>,
    height_request: Option<i32>,
    hexpand: Option<bool>,
    hexpand_set: Option<bool>,
    layout_manager: Option<LayoutManager>,
    margin_bottom: Option<i32>,
    margin_end: Option<i32>,
    margin_start: Option<i32>,
    margin_top: Option<i32>,
    name: Option<String>,
    opacity: Option<f64>,
    overflow: Option<Overflow>,
    receives_default: Option<bool>,
    sensitive: Option<bool>,
    tooltip_markup: Option<String>,
    tooltip_text: Option<String>,
    valign: Option<Align>,
    vexpand: Option<bool>,
    vexpand_set: Option<bool>,
    visible: Option<bool>,
    width_request: Option<i32>,
    accessible_role: Option<AccessibleRole>,
    orientation: Option<Orientation>,
}

impl ScaleBuilder {
    // rustdoc-stripper-ignore-next
    /// Create a new [`ScaleBuilder`].
    pub fn new() -> Self {
        Self::default()
    }

    // rustdoc-stripper-ignore-next
    /// Build the [`Scale`].
    pub fn build(self) -> Scale {
        let mut properties: Vec<(&str, &dyn ToValue)> = vec![];
        if let Some(ref digits) = self.digits {
            properties.push(("digits", digits));
        }
        if let Some(ref draw_value) = self.draw_value {
            properties.push(("draw-value", draw_value));
        }
        if let Some(ref has_origin) = self.has_origin {
            properties.push(("has-origin", has_origin));
        }
        if let Some(ref value_pos) = self.value_pos {
            properties.push(("value-pos", value_pos));
        }
        if let Some(ref adjustment) = self.adjustment {
            properties.push(("adjustment", adjustment));
        }
        if let Some(ref fill_level) = self.fill_level {
            properties.push(("fill-level", fill_level));
        }
        if let Some(ref inverted) = self.inverted {
            properties.push(("inverted", inverted));
        }
        if let Some(ref restrict_to_fill_level) = self.restrict_to_fill_level {
            properties.push(("restrict-to-fill-level", restrict_to_fill_level));
        }
        if let Some(ref round_digits) = self.round_digits {
            properties.push(("round-digits", round_digits));
        }
        if let Some(ref show_fill_level) = self.show_fill_level {
            properties.push(("show-fill-level", show_fill_level));
        }
        if let Some(ref can_focus) = self.can_focus {
            properties.push(("can-focus", can_focus));
        }
        if let Some(ref can_target) = self.can_target {
            properties.push(("can-target", can_target));
        }
        if let Some(ref css_classes) = self.css_classes {
            properties.push(("css-classes", css_classes));
        }
        if let Some(ref css_name) = self.css_name {
            properties.push(("css-name", css_name));
        }
        if let Some(ref cursor) = self.cursor {
            properties.push(("cursor", cursor));
        }
        if let Some(ref focus_on_click) = self.focus_on_click {
            properties.push(("focus-on-click", focus_on_click));
        }
        if let Some(ref focusable) = self.focusable {
            properties.push(("focusable", focusable));
        }
        if let Some(ref halign) = self.halign {
            properties.push(("halign", halign));
        }
        if let Some(ref has_tooltip) = self.has_tooltip {
            properties.push(("has-tooltip", has_tooltip));
        }
        if let Some(ref height_request) = self.height_request {
            properties.push(("height-request", height_request));
        }
        if let Some(ref hexpand) = self.hexpand {
            properties.push(("hexpand", hexpand));
        }
        if let Some(ref hexpand_set) = self.hexpand_set {
            properties.push(("hexpand-set", hexpand_set));
        }
        if let Some(ref layout_manager) = self.layout_manager {
            properties.push(("layout-manager", layout_manager));
        }
        if let Some(ref margin_bottom) = self.margin_bottom {
            properties.push(("margin-bottom", margin_bottom));
        }
        if let Some(ref margin_end) = self.margin_end {
            properties.push(("margin-end", margin_end));
        }
        if let Some(ref margin_start) = self.margin_start {
            properties.push(("margin-start", margin_start));
        }
        if let Some(ref margin_top) = self.margin_top {
            properties.push(("margin-top", margin_top));
        }
        if let Some(ref name) = self.name {
            properties.push(("name", name));
        }
        if let Some(ref opacity) = self.opacity {
            properties.push(("opacity", opacity));
        }
        if let Some(ref overflow) = self.overflow {
            properties.push(("overflow", overflow));
        }
        if let Some(ref receives_default) = self.receives_default {
            properties.push(("receives-default", receives_default));
        }
        if let Some(ref sensitive) = self.sensitive {
            properties.push(("sensitive", sensitive));
        }
        if let Some(ref tooltip_markup) = self.tooltip_markup {
            properties.push(("tooltip-markup", tooltip_markup));
        }
        if let Some(ref tooltip_text) = self.tooltip_text {
            properties.push(("tooltip-text", tooltip_text));
        }
        if let Some(ref valign) = self.valign {
            properties.push(("valign", valign));
        }
        if let Some(ref vexpand) = self.vexpand {
            properties.push(("vexpand", vexpand));
        }
        if let Some(ref vexpand_set) = self.vexpand_set {
            properties.push(("vexpand-set", vexpand_set));
        }
        if let Some(ref visible) = self.visible {
            properties.push(("visible", visible));
        }
        if let Some(ref width_request) = self.width_request {
            properties.push(("width-request", width_request));
        }
        if let Some(ref accessible_role) = self.accessible_role {
            properties.push(("accessible-role", accessible_role));
        }
        if let Some(ref orientation) = self.orientation {
            properties.push(("orientation", orientation));
        }
        glib::Object::new::<Scale>(&properties).expect("Failed to create an instance of Scale")
    }

    /// The number of decimal places that are displayed in the value.
    pub fn digits(mut self, digits: i32) -> Self {
        self.digits = Some(digits);
        self
    }

    /// Whether the current value is displayed as a string next to the slider.
    pub fn draw_value(mut self, draw_value: bool) -> Self {
        self.draw_value = Some(draw_value);
        self
    }

    /// Whether the scale has an origin.
    pub fn has_origin(mut self, has_origin: bool) -> Self {
        self.has_origin = Some(has_origin);
        self
    }

    /// The position in which the current value is displayed.
    pub fn value_pos(mut self, value_pos: PositionType) -> Self {
        self.value_pos = Some(value_pos);
        self
    }

    /// The adjustment that is controlled by the range.
    pub fn adjustment<P: IsA<Adjustment>>(mut self, adjustment: &P) -> Self {
        self.adjustment = Some(adjustment.clone().upcast());
        self
    }

    /// The fill level (e.g. prebuffering of a network stream).
    pub fn fill_level(mut self, fill_level: f64) -> Self {
        self.fill_level = Some(fill_level);
        self
    }

    /// If [`true`], the direction in which the slider moves is inverted.
    pub fn inverted(mut self, inverted: bool) -> Self {
        self.inverted = Some(inverted);
        self
    }

    /// Controls whether slider movement is restricted to an
    /// upper boundary set by the fill level.
    pub fn restrict_to_fill_level(mut self, restrict_to_fill_level: bool) -> Self {
        self.restrict_to_fill_level = Some(restrict_to_fill_level);
        self
    }

    /// The number of digits to round the value to when
    /// it changes.
    ///
    /// See `signal::Range::change-value`.
    pub fn round_digits(mut self, round_digits: i32) -> Self {
        self.round_digits = Some(round_digits);
        self
    }

    /// Controls whether fill level indicator graphics are displayed
    /// on the trough.
    pub fn show_fill_level(mut self, show_fill_level: bool) -> Self {
        self.show_fill_level = Some(show_fill_level);
        self
    }

    /// Whether the widget or any of its descendents can accept
    /// the input focus.
    ///
    /// This property is meant to be set by widget implementations,
    /// typically in their instance init function.
    pub fn can_focus(mut self, can_focus: bool) -> Self {
        self.can_focus = Some(can_focus);
        self
    }

    /// Whether the widget can receive pointer events.
    pub fn can_target(mut self, can_target: bool) -> Self {
        self.can_target = Some(can_target);
        self
    }

    /// A list of css classes applied to this widget.
    pub fn css_classes(mut self, css_classes: Vec<String>) -> Self {
        self.css_classes = Some(css_classes);
        self
    }

    /// The name of this widget in the CSS tree.
    ///
    /// This property is meant to be set by widget implementations,
    /// typically in their instance init function.
    pub fn css_name(mut self, css_name: &str) -> Self {
        self.css_name = Some(css_name.to_string());
        self
    }

    /// The cursor used by `widget`.
    pub fn cursor(mut self, cursor: &gdk::Cursor) -> Self {
        self.cursor = Some(cursor.clone());
        self
    }

    /// Whether the widget should grab focus when it is clicked with the mouse.
    ///
    /// This property is only relevant for widgets that can take focus.
    pub fn focus_on_click(mut self, focus_on_click: bool) -> Self {
        self.focus_on_click = Some(focus_on_click);
        self
    }

    /// Whether this widget itself will accept the input focus.
    pub fn focusable(mut self, focusable: bool) -> Self {
        self.focusable = Some(focusable);
        self
    }

    /// How to distribute horizontal space if widget gets extra space.
    pub fn halign(mut self, halign: Align) -> Self {
        self.halign = Some(halign);
        self
    }

    /// Enables or disables the emission of the ::query-tooltip signal on `widget`.
    ///
    /// A value of [`true`] indicates that `widget` can have a tooltip, in this case
    /// the widget will be queried using `signal::Widget::query-tooltip` to
    /// determine whether it will provide a tooltip or not.
    pub fn has_tooltip(mut self, has_tooltip: bool) -> Self {
        self.has_tooltip = Some(has_tooltip);
        self
    }

    /// Override for height request of the widget.
    ///
    /// If this is -1, the natural request will be used.
    pub fn height_request(mut self, height_request: i32) -> Self {
        self.height_request = Some(height_request);
        self
    }

    /// Whether to expand horizontally.
    pub fn hexpand(mut self, hexpand: bool) -> Self {
        self.hexpand = Some(hexpand);
        self
    }

    /// Whether to use the `hexpand` property.
    pub fn hexpand_set(mut self, hexpand_set: bool) -> Self {
        self.hexpand_set = Some(hexpand_set);
        self
    }

    /// The [`LayoutManager`][crate::LayoutManager] instance to use to compute the preferred size
    /// of the widget, and allocate its children.
    ///
    /// This property is meant to be set by widget implementations,
    /// typically in their instance init function.
    pub fn layout_manager<P: IsA<LayoutManager>>(mut self, layout_manager: &P) -> Self {
        self.layout_manager = Some(layout_manager.clone().upcast());
        self
    }

    /// Margin on bottom side of widget.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [``WidgetExt::set_size_request()``][crate::prelude::`WidgetExt::set_size_request()`] for example.
    pub fn margin_bottom(mut self, margin_bottom: i32) -> Self {
        self.margin_bottom = Some(margin_bottom);
        self
    }

    /// Margin on end of widget, horizontally.
    ///
    /// This property supports left-to-right and right-to-left text
    /// directions.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [``WidgetExt::set_size_request()``][crate::prelude::`WidgetExt::set_size_request()`] for example.
    pub fn margin_end(mut self, margin_end: i32) -> Self {
        self.margin_end = Some(margin_end);
        self
    }

    /// Margin on start of widget, horizontally.
    ///
    /// This property supports left-to-right and right-to-left text
    /// directions.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [``WidgetExt::set_size_request()``][crate::prelude::`WidgetExt::set_size_request()`] for example.
    pub fn margin_start(mut self, margin_start: i32) -> Self {
        self.margin_start = Some(margin_start);
        self
    }

    /// Margin on top side of widget.
    ///
    /// This property adds margin outside of the widget's normal size
    /// request, the margin will be added in addition to the size from
    /// [``WidgetExt::set_size_request()``][crate::prelude::`WidgetExt::set_size_request()`] for example.
    pub fn margin_top(mut self, margin_top: i32) -> Self {
        self.margin_top = Some(margin_top);
        self
    }

    /// The name of the widget.
    pub fn name(mut self, name: &str) -> Self {
        self.name = Some(name.to_string());
        self
    }

    /// The requested opacity of the widget.
    pub fn opacity(mut self, opacity: f64) -> Self {
        self.opacity = Some(opacity);
        self
    }

    /// How content outside the widget's content area is treated.
    ///
    /// This property is meant to be set by widget implementations,
    /// typically in their instance init function.
    pub fn overflow(mut self, overflow: Overflow) -> Self {
        self.overflow = Some(overflow);
        self
    }

    /// Whether the widget will receive the default action when it is focused.
    pub fn receives_default(mut self, receives_default: bool) -> Self {
        self.receives_default = Some(receives_default);
        self
    }

    /// Whether the widget responds to input.
    pub fn sensitive(mut self, sensitive: bool) -> Self {
        self.sensitive = Some(sensitive);
        self
    }

    /// Sets the text of tooltip to be the given string, which is marked up
    /// with Pango markup.
    ///
    /// Also see [``Tooltip::set_markup()``][crate::`Tooltip::set_markup()`].
    ///
    /// This is a convenience property which will take care of getting the
    /// tooltip shown if the given string is not [`None`]:
    /// `property::Widget::has-tooltip` will automatically be set to [`true`]
    /// and there will be taken care of `signal::Widget::query-tooltip` in
    /// the default signal handler.
    ///
    /// Note that if both `property::Widget::tooltip-text` and
    /// `property::Widget::tooltip-markup` are set, the last one wins.
    pub fn tooltip_markup(mut self, tooltip_markup: &str) -> Self {
        self.tooltip_markup = Some(tooltip_markup.to_string());
        self
    }

    /// Sets the text of tooltip to be the given string.
    ///
    /// Also see [``Tooltip::set_text()``][crate::`Tooltip::set_text()`].
    ///
    /// This is a convenience property which will take care of getting the
    /// tooltip shown if the given string is not [`None`]:
    /// `property::Widget::has-tooltip` will automatically be set to [`true`]
    /// and there will be taken care of `signal::Widget::query-tooltip` in
    /// the default signal handler.
    ///
    /// Note that if both `property::Widget::tooltip-text` and
    /// `property::Widget::tooltip-markup` are set, the last one wins.
    pub fn tooltip_text(mut self, tooltip_text: &str) -> Self {
        self.tooltip_text = Some(tooltip_text.to_string());
        self
    }

    /// How to distribute vertical space if widget gets extra space.
    pub fn valign(mut self, valign: Align) -> Self {
        self.valign = Some(valign);
        self
    }

    /// Whether to expand vertically.
    pub fn vexpand(mut self, vexpand: bool) -> Self {
        self.vexpand = Some(vexpand);
        self
    }

    /// Whether to use the `vexpand` property.
    pub fn vexpand_set(mut self, vexpand_set: bool) -> Self {
        self.vexpand_set = Some(vexpand_set);
        self
    }

    /// Whether the widget is visible.
    pub fn visible(mut self, visible: bool) -> Self {
        self.visible = Some(visible);
        self
    }

    /// Override for width request of the widget.
    ///
    /// If this is -1, the natural request will be used.
    pub fn width_request(mut self, width_request: i32) -> Self {
        self.width_request = Some(width_request);
        self
    }

    /// The accessible role of the given [`Accessible`][crate::Accessible] implementation.
    ///
    /// The accessible role cannot be changed once set.
    pub fn accessible_role(mut self, accessible_role: AccessibleRole) -> Self {
        self.accessible_role = Some(accessible_role);
        self
    }

    /// The orientation of the orientable.
    pub fn orientation(mut self, orientation: Orientation) -> Self {
        self.orientation = Some(orientation);
        self
    }
}

pub const NONE_SCALE: Option<&Scale> = None;

/// Trait containing all [`struct@Scale`] methods.
///
/// # Implementors
///
/// [`Scale`][struct@crate::Scale]
pub trait ScaleExt: 'static {
    /// 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 [`None`], text is shown next to the tick mark.
    ///
    /// To remove marks from a scale, use [``clear_marks()``][`Self::clear_marks()`].
    /// ## `value`
    /// the value at which the mark is placed, must be between
    ///  the lower and upper limits of the scales’ adjustment
    /// ## `position`
    /// where to draw the mark. For a horizontal scale, [`PositionType::Top`][crate::PositionType::Top]
    ///  and [`PositionType::Left`][crate::PositionType::Left] are drawn above the scale, anything else below.
    ///  For a vertical scale, [`PositionType::Left`][crate::PositionType::Left] and [`PositionType::Top`][crate::PositionType::Top] are drawn to
    ///  the left of the scale, anything else to the right.
    /// ## `markup`
    /// Text to be shown at the mark, using Pango markup
    #[doc(alias = "gtk_scale_add_mark")]
    fn add_mark(&self, value: f64, position: PositionType, markup: Option<&str>);

    /// Removes any marks that have been added.
    #[doc(alias = "gtk_scale_clear_marks")]
    fn clear_marks(&self);

    /// Gets the number of decimal places that are displayed in the value.
    ///
    /// # Returns
    ///
    /// the number of decimal places that are displayed
    #[doc(alias = "gtk_scale_get_digits")]
    #[doc(alias = "get_digits")]
    fn digits(&self) -> i32;

    /// Returns whether the current value is displayed as a string
    /// next to the slider.
    ///
    /// # Returns
    ///
    /// whether the current value is displayed as a string
    #[doc(alias = "gtk_scale_get_draw_value")]
    #[doc(alias = "get_draw_value")]
    fn draws_value(&self) -> bool;

    /// Returns whether the scale has an origin.
    ///
    /// # Returns
    ///
    /// [`true`] if the scale has an origin.
    #[doc(alias = "gtk_scale_get_has_origin")]
    #[doc(alias = "get_has_origin")]
    fn has_origin(&self) -> bool;

    /// Gets the [`pango::Layout`][crate::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.
    ///
    /// # Returns
    ///
    /// the [`pango::Layout`][crate::pango::Layout]
    ///  for this scale, or [`None`] if the `property::GtkScale::draw-value`
    ///  property is [`false`].
    #[doc(alias = "gtk_scale_get_layout")]
    #[doc(alias = "get_layout")]
    fn layout(&self) -> Option<pango::Layout>;

    /// Obtains the coordinates where the scale will draw the
    /// [`pango::Layout`][crate::pango::Layout] representing the text in the scale.
    ///
    /// Remember when using the [`pango::Layout`][crate::pango::Layout] function you need to
    /// convert to and from pixels using `PANGO_PIXELS()` or `PANGO_SCALE`.
    ///
    /// If the `property::GtkScale::draw-value` property is [`false`], the return
    /// values are undefined.
    ///
    /// # Returns
    ///
    ///
    /// ## `x`
    /// location to store X offset of layout
    ///
    /// ## `y`
    /// location to store Y offset of layout
    #[doc(alias = "gtk_scale_get_layout_offsets")]
    #[doc(alias = "get_layout_offsets")]
    fn layout_offsets(&self) -> (i32, i32);

    /// Gets the position in which the current value is displayed.
    ///
    /// # Returns
    ///
    /// the position in which the current value is displayed
    #[doc(alias = "gtk_scale_get_value_pos")]
    #[doc(alias = "get_value_pos")]
    fn value_pos(&self) -> PositionType;

    /// 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::GtkScale::draw-value` is [`true`] when the value changes. If
    /// you want to enforce rounding the value when `property::GtkScale::draw-value`
    /// is [`false`], you can set `property::GtkRange::round-digits` instead.
    ///
    /// Note that rounding to a small number of digits can interfere with
    /// the smooth autoscrolling that is built into [`Scale`][crate::Scale]. As an alternative,
    /// you can use [``set_format_value_func()``][`Self::set_format_value_func()`] to format the displayed
    /// value yourself.
    /// ## `digits`
    /// the number of decimal places to display,
    ///  e.g. use 1 to display 1.0, 2 to display 1.00, etc
    #[doc(alias = "gtk_scale_set_digits")]
    fn set_digits(&self, digits: i32);

    /// Specifies whether the current value is displayed as a string next
    /// to the slider.
    /// ## `draw_value`
    /// [`true`] to draw the value
    #[doc(alias = "gtk_scale_set_draw_value")]
    fn set_draw_value(&self, draw_value: bool);

    /// `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 [`None`] is passed as `func`, the value will be displayed on
    /// its own, rounded according to the value of the
    /// `property::GtkScale::digits` property.
    /// ## `func`
    /// function that formats the value
    /// ## `destroy_notify`
    /// destroy function for `user_data`
    #[doc(alias = "gtk_scale_set_format_value_func")]
    fn set_format_value_func<P: Fn(&Scale, f64) -> String + 'static>(&self, func: P);

    /// Sets whether the scale has an origin.
    ///
    /// If `property::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.
    /// ## `has_origin`
    /// [`true`] if the scale has an origin
    #[doc(alias = "gtk_scale_set_has_origin")]
    fn set_has_origin(&self, has_origin: bool);

    /// Sets the position in which the current value is displayed.
    /// ## `pos`
    /// the position in which the current value is displayed
    #[doc(alias = "gtk_scale_set_value_pos")]
    fn set_value_pos(&self, pos: PositionType);

    #[doc(alias = "digits")]
    fn connect_digits_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;

    #[doc(alias = "draw-value")]
    fn connect_draw_value_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;

    #[doc(alias = "has-origin")]
    fn connect_has_origin_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;

    #[doc(alias = "value-pos")]
    fn connect_value_pos_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;
}

impl<O: IsA<Scale>> ScaleExt for O {
    fn add_mark(&self, value: f64, position: PositionType, markup: Option<&str>) {
        unsafe {
            ffi::gtk_scale_add_mark(
                self.as_ref().to_glib_none().0,
                value,
                position.into_glib(),
                markup.to_glib_none().0,
            );
        }
    }

    fn clear_marks(&self) {
        unsafe {
            ffi::gtk_scale_clear_marks(self.as_ref().to_glib_none().0);
        }
    }

    fn digits(&self) -> i32 {
        unsafe { ffi::gtk_scale_get_digits(self.as_ref().to_glib_none().0) }
    }

    fn draws_value(&self) -> bool {
        unsafe {
            from_glib(ffi::gtk_scale_get_draw_value(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn has_origin(&self) -> bool {
        unsafe {
            from_glib(ffi::gtk_scale_get_has_origin(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn layout(&self) -> Option<pango::Layout> {
        unsafe { from_glib_none(ffi::gtk_scale_get_layout(self.as_ref().to_glib_none().0)) }
    }

    fn layout_offsets(&self) -> (i32, i32) {
        unsafe {
            let mut x = mem::MaybeUninit::uninit();
            let mut y = mem::MaybeUninit::uninit();
            ffi::gtk_scale_get_layout_offsets(
                self.as_ref().to_glib_none().0,
                x.as_mut_ptr(),
                y.as_mut_ptr(),
            );
            let x = x.assume_init();
            let y = y.assume_init();
            (x, y)
        }
    }

    fn value_pos(&self) -> PositionType {
        unsafe { from_glib(ffi::gtk_scale_get_value_pos(self.as_ref().to_glib_none().0)) }
    }

    fn set_digits(&self, digits: i32) {
        unsafe {
            ffi::gtk_scale_set_digits(self.as_ref().to_glib_none().0, digits);
        }
    }

    fn set_draw_value(&self, draw_value: bool) {
        unsafe {
            ffi::gtk_scale_set_draw_value(self.as_ref().to_glib_none().0, draw_value.into_glib());
        }
    }

    fn set_format_value_func<P: Fn(&Scale, f64) -> String + 'static>(&self, func: P) {
        let func_data: Box_<P> = Box_::new(func);
        unsafe extern "C" fn func_func<P: Fn(&Scale, f64) -> String + 'static>(
            scale: *mut ffi::GtkScale,
            value: libc::c_double,
            user_data: glib::ffi::gpointer,
        ) -> *mut libc::c_char {
            let scale = from_glib_borrow(scale);
            let callback: &P = &*(user_data as *mut _);
            let res = (*callback)(&scale, value);
            res.to_glib_full()
        }
        let func = Some(func_func::<P> as _);
        unsafe extern "C" fn destroy_notify_func<P: Fn(&Scale, f64) -> String + 'static>(
            data: glib::ffi::gpointer,
        ) {
            let _callback: Box_<P> = Box_::from_raw(data as *mut _);
        }
        let destroy_call3 = Some(destroy_notify_func::<P> as _);
        let super_callback0: Box_<P> = func_data;
        unsafe {
            ffi::gtk_scale_set_format_value_func(
                self.as_ref().to_glib_none().0,
                func,
                Box_::into_raw(super_callback0) as *mut _,
                destroy_call3,
            );
        }
    }

    fn set_has_origin(&self, has_origin: bool) {
        unsafe {
            ffi::gtk_scale_set_has_origin(self.as_ref().to_glib_none().0, has_origin.into_glib());
        }
    }

    fn set_value_pos(&self, pos: PositionType) {
        unsafe {
            ffi::gtk_scale_set_value_pos(self.as_ref().to_glib_none().0, pos.into_glib());
        }
    }

    fn connect_digits_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_digits_trampoline<P: IsA<Scale>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkScale,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(Scale::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::digits\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_digits_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn connect_draw_value_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_draw_value_trampoline<P: IsA<Scale>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkScale,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(Scale::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::draw-value\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_draw_value_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn connect_has_origin_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_has_origin_trampoline<P: IsA<Scale>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkScale,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(Scale::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::has-origin\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_has_origin_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn connect_value_pos_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_value_pos_trampoline<P: IsA<Scale>, F: Fn(&P) + 'static>(
            this: *mut ffi::GtkScale,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(Scale::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::value-pos\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_value_pos_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

impl fmt::Display for Scale {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str("Scale")
    }
}