pub struct Slider { /* private fields */ }
Expand description

A slider, allowing interactive update of a numeric value.

This slider implements Widget<f64>, and works on values clamped in the range min..max.

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impl Slider

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pub fn new() -> Slider

Create a new Slider.

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pub fn with_range(self, min: f64, max: f64) -> Self

Builder-style method to set the range covered by this slider.

The default range is 0.0..1.0.

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pub fn with_step(self, step: f64) -> Self

Builder-style method to set the stepping.

The default step size is 0.0 (smooth).

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pub fn knob_style(self, knob_style: KnobStyle) -> Self

Builder-style method to set the knob style.

The default is Circle.

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pub fn axis(self, axis: Axis) -> Self

Builder-style method to the the axis on which the slider moves.

The default is Horizontal.

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pub fn get_mapping(&self) -> SliderValueMapping

Returns the Mapping of this Slider.

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pub fn annotated( self, named_steps: f64, unnamed_steps: f64 ) -> Annotated<f64, Self>

Builder-style method to create an annotated range slider.

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impl Clone for Slider

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fn clone(&self) -> Slider

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Slider

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for Slider

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fn default() -> Slider

Returns the “default value” for a type. Read more
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impl Widget<f64> for Slider

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fn event( &mut self, ctx: &mut EventCtx<'_, '_>, event: &Event, data: &mut f64, env: &Env )

Handle an event. Read more
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fn lifecycle( &mut self, ctx: &mut LifeCycleCtx<'_, '_>, event: &LifeCycle, _data: &f64, _env: &Env )

Handle a life cycle notification. Read more
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fn update( &mut self, ctx: &mut UpdateCtx<'_, '_>, _old_data: &f64, _data: &f64, _env: &Env )

Update the widget’s appearance in response to a change in the app’s [Data] or [Env]. Read more
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fn layout( &mut self, ctx: &mut LayoutCtx<'_, '_>, bc: &BoxConstraints, _data: &f64, env: &Env ) -> Size

Compute layout. Read more
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fn paint(&mut self, ctx: &mut PaintCtx<'_, '_, '_>, data: &f64, env: &Env)

Paint the widget appearance. Read more
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fn compute_max_intrinsic( &mut self, axis: Axis, ctx: &mut LayoutCtx<'_, '_>, bc: &BoxConstraints, data: &T, env: &Env ) -> f64

Computes max intrinsic/preferred dimension of a widget on the provided axis. Read more

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> RoundFrom<T> for T

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fn round_from(x: T) -> T

Performs the conversion.
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impl<T, U> RoundInto<U> for Twhere U: RoundFrom<T>,

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fn round_into(self) -> U

Performs the conversion.
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impl<T> Same<T> for T

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type Output = T

Should always be Self
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impl<T, W> TestWidgetExt<T> for Wwhere T: Data, W: Widget<T> + 'static,

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fn record(self, recording: &Recording) -> Recorder<Self>

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T, W> WidgetExt<T> for Wwhere T: Data, W: Widget<T> + 'static,

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fn on_command<CT: 'static>( self, selector: Selector<CT>, handler: impl Fn(&mut EventCtx<'_, '_>, &CT, &mut T) + 'static ) -> ControllerHost<Self, OnCmd<CT, T>>

用当该组件接收到指定的 [druid::Command] 时产生回调的控制器 crate::widgets::OnCmd 包裹当前组件
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fn on_notify<CT: 'static>( self, selector: Selector<CT>, handler: impl Fn(&mut EventCtx<'_, '_>, &CT, &mut T) + 'static ) -> OnNotify<CT, T>

用当该组件接收到指定的 [druid::Notification] 时产生回调的控制器 crate::widgets::OnNotify 包裹当前组件
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fn on_change( self, f: impl Fn(&mut EventCtx<'_, '_>, &T, &mut T, &Env) + 'static ) -> ControllerHost<Self, OnChange<T>>

Calls the function when data changes in a child widget Read more
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fn show_if(self, f: ShowIfCallback<T>) -> ShowIf<T>

当数据变更时触发回调,如果为 true 则显示包裹起来的组件,否则隐藏 Read more
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impl<T, W> WidgetExt<T> for Wwhere T: Data, W: Widget<T> + 'static,

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fn padding(self, insets: impl Into<KeyOrValue<Insets>>) -> Padding<T, Self>

Wrap this widget in a [Padding] widget with the given [Insets]. Read more
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fn center(self) -> Align<T>

Wrap this widget in an [Align] widget, configured to center it.
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fn align_left(self) -> Align<T>

Wrap this widget in an [Align] widget, configured to align left.
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fn align_right(self) -> Align<T>

Wrap this widget in an [Align] widget, configured to align right.
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fn align_vertical(self, align: UnitPoint) -> Align<T>

Wrap this widget in an [Align] widget, configured to align vertically.
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fn align_horizontal(self, align: UnitPoint) -> Align<T>

Wrap this widget in an [Align] widget, configured to align horizontally.
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fn fix_width(self, width: impl Into<KeyOrValue<f64>>) -> SizedBox<T>

Wrap this widget in a [SizedBox] with an explicit width.
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fn fix_height(self, height: impl Into<KeyOrValue<f64>>) -> SizedBox<T>

Wrap this widget in a [SizedBox] with an explicit height.
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fn fix_size( self, width: impl Into<KeyOrValue<f64>>, height: impl Into<KeyOrValue<f64>> ) -> SizedBox<T>

Wrap this widget in an [SizedBox] with an explicit width and height
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fn expand(self) -> SizedBox<T>

Wrap this widget in a [SizedBox] with an infinite width and height. Read more
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fn expand_width(self) -> SizedBox<T>

Wrap this widget in a [SizedBox] with an infinite width. Read more
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fn expand_height(self) -> SizedBox<T>

Wrap this widget in a [SizedBox] with an infinite width. Read more
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fn background(self, brush: impl Into<BackgroundBrush<T>>) -> Container<T>

Wrap this widget in a [Container] with the provided background brush. Read more
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fn foreground(self, brush: impl Into<BackgroundBrush<T>>) -> Container<T>

Wrap this widget in a [Container] with the provided foreground brush. Read more
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fn border( self, color: impl Into<KeyOrValue<Color>>, width: impl Into<KeyOrValue<f64>> ) -> Container<T>

Wrap this widget in a [Container] with the given border. Read more
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fn env_scope(self, f: impl Fn(&mut Env, &T) + 'static) -> EnvScope<T, Self>

Wrap this widget in a [EnvScope] widget, modifying the parent [Env] with the provided closure.
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fn controller<C>(self, controller: C) -> ControllerHost<Self, C>where C: Controller<T, Self>,

Wrap this widget with the provided [Controller].
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fn on_added( self, f: impl Fn(&mut Self, &mut LifeCycleCtx<'_, '_>, &T, &Env) + 'static ) -> ControllerHost<Self, Added<T, Self>>

Provide a closure that will be called when this widget is added to the widget tree. Read more
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fn on_click( self, f: impl Fn(&mut EventCtx<'_, '_>, &mut T, &Env) + 'static ) -> ControllerHost<Self, Click<T>>

Control the events of this widget with a [Click] widget. The closure provided will be called when the widget is clicked with the left mouse button. Read more
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fn debug_paint_layout(self) -> EnvScope<T, Self>

Draw the layout Rects of this widget and its children.
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fn debug_widget_id(self) -> EnvScope<T, Self>

Display the WidgetIds for this widget and its children, when hot. Read more
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fn debug_invalidation(self) -> DebugInvalidation<T, Self>

Draw a color-changing rectangle over this widget, allowing you to see the invalidation regions.
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fn debug_widget(self) -> EnvScope<T, Self>

Set the DEBUG_WIDGET env variable for this widget (and its descendants). Read more
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fn lens<S, L>(self, lens: L) -> LensWrap<S, T, L, Self>where S: Data, L: Lens<S, T>,

Wrap this widget in a [LensWrap] widget for the provided [Lens].
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fn with_id(self, id: WidgetId) -> IdentityWrapper<Self>

Assign the widget a specific [WidgetId]. Read more
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fn boxed(self) -> Box<dyn Widget<T>, Global>

Wrap this widget in a Box.
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fn scroll(self) -> Scroll<T, Self>

Wrap this widget in a [Scroll] widget.
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fn disabled_if( self, disabled_if: impl Fn(&T, &Env) -> bool + 'static ) -> DisabledIf<T, Self>

Wrap this widget in a [DisabledIf] widget. Read more
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more