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freya_core/elements/
extensions.rs

1use std::{
2    borrow::Cow,
3    hash::{
4        Hash,
5        Hasher,
6    },
7};
8
9use paste::paste;
10use rustc_hash::{
11    FxHashMap,
12    FxHasher,
13};
14use torin::{
15    content::Content,
16    gaps::Gaps,
17    prelude::{
18        Alignment,
19        Direction,
20        Length,
21        Position,
22        VisibleSize,
23    },
24    size::Size,
25};
26
27use crate::{
28    data::{
29        AccessibilityData,
30        EffectData,
31        LayoutData,
32        Overflow,
33        TextStyleData,
34    },
35    diff_key::DiffKey,
36    element::{
37        Element,
38        EventHandlerType,
39    },
40    elements::image::{
41        AspectRatio,
42        ImageCover,
43        ImageData,
44        SamplingMode,
45    },
46    event_handler::EventHandler,
47    events::{
48        data::{
49            Event,
50            KeyboardEventData,
51            MouseEventData,
52            SizedEventData,
53            WheelEventData,
54        },
55        name::EventName,
56    },
57    layers::Layer,
58    prelude::*,
59    style::{
60        font_size::FontSize,
61        font_slant::FontSlant,
62        font_weight::FontWeight,
63        font_width::FontWidth,
64        scale::Scale,
65        text_height::TextHeightBehavior,
66        text_overflow::TextOverflow,
67        text_shadow::TextShadow,
68    },
69};
70
71/// Trait for composing child elements.
72pub trait ChildrenExt: Sized {
73    /// Returns a mutable reference to the internal children vector.
74    ///
75    /// # Example
76    /// ```ignore
77    /// impl ChildrenExt for MyElement {
78    ///     fn get_children(&mut self) -> &mut Vec<Element> {
79    ///         &mut self.elements
80    ///     }
81    /// }
82    /// ```
83    fn get_children(&mut self) -> &mut Vec<Element>;
84
85    /// Extends the children with an iterable of [`Element`]s.
86    ///
87    /// # Example
88    /// ```ignore
89    /// rect().children(["Hello", "World"].map(|t| label().text(t).into_element()))
90    /// ```
91    fn children(mut self, children: impl IntoIterator<Item = Element>) -> Self {
92        self.get_children().extend(children);
93        self
94    }
95
96    /// Appends a child only when the [`Option`] is [`Some`].
97    ///
98    /// # Example
99    /// ```ignore
100    /// rect().maybe_child(show_badge.then(|| label().text("New")))
101    /// ```
102    fn maybe_child<C: IntoElement>(mut self, child: Option<C>) -> Self {
103        if let Some(child) = child {
104            self.get_children().push(child.into_element());
105        }
106        self
107    }
108
109    /// Appends a single child element.
110    ///
111    /// # Example
112    /// ```ignore
113    /// rect().child(label().text("Hello"))
114    /// ```
115    fn child<C: IntoElement>(mut self, child: C) -> Self {
116        self.get_children().push(child.into_element());
117        self
118    }
119}
120
121pub trait KeyExt: Sized {
122    fn write_key(&mut self) -> &mut DiffKey;
123
124    fn key(mut self, key: impl Hash) -> Self {
125        let mut hasher = FxHasher::default();
126        key.hash(&mut hasher);
127        *self.write_key() = DiffKey::U64(hasher.finish());
128        self
129    }
130}
131
132pub trait ListExt {
133    fn with(self, other: Self) -> Self;
134}
135
136impl<T> ListExt for Vec<T> {
137    fn with(mut self, other: Self) -> Self {
138        self.extend(other);
139        self
140    }
141}
142
143macro_rules! event_handlers {
144    (
145        $handler_variant:ident, $event_data:ty;
146        $(
147            $name:ident => $event_variant:expr ;
148        )*
149    ) => {
150        paste! {
151            $(
152                fn [<on_$name>](mut self, [<on_$name>]: impl Into<EventHandler<Event<$event_data>>>) -> Self {
153                    self.get_event_handlers()
154                        .insert($event_variant, EventHandlerType::$handler_variant([<on_$name>].into()));
155                    self
156                }
157            )*
158        }
159    };
160}
161
162pub trait EventHandlersExt: Sized {
163    fn get_event_handlers(&mut self) -> &mut FxHashMap<EventName, EventHandlerType>;
164
165    fn with_event_handlers(
166        mut self,
167        event_handlers: FxHashMap<EventName, EventHandlerType>,
168    ) -> Self {
169        *self.get_event_handlers() = event_handlers;
170        self
171    }
172
173    event_handlers! {
174        Mouse,
175        MouseEventData;
176
177        mouse_down => EventName::MouseDown;
178        mouse_up => EventName::MouseUp;
179        mouse_move => EventName::MouseMove;
180
181    }
182
183    event_handlers! {
184        Pointer,
185        PointerEventData;
186
187        global_pointer_press => EventName::GlobalPointerPress;
188        global_pointer_down => EventName::GlobalPointerDown;
189        global_pointer_move => EventName::GlobalPointerMove;
190
191        capture_global_pointer_move => EventName::CaptureGlobalPointerMove;
192        capture_global_pointer_press => EventName::CaptureGlobalPointerPress;
193    }
194
195    event_handlers! {
196        Keyboard,
197        KeyboardEventData;
198
199        key_down => EventName::KeyDown;
200        key_up => EventName::KeyUp;
201
202        global_key_down => EventName::GlobalKeyDown;
203        global_key_up => EventName::GlobalKeyUp;
204    }
205
206    event_handlers! {
207        Wheel,
208        WheelEventData;
209
210        wheel => EventName::Wheel;
211    }
212
213    event_handlers! {
214        Touch,
215        TouchEventData;
216
217        touch_cancel => EventName::TouchCancel;
218        touch_start => EventName::TouchStart;
219        touch_move => EventName::TouchMove;
220        touch_end => EventName::TouchEnd;
221    }
222
223    event_handlers! {
224        Pointer,
225        PointerEventData;
226
227        pointer_press => EventName::PointerPress;
228        pointer_down => EventName::PointerDown;
229        pointer_enter => EventName::PointerEnter;
230        pointer_leave => EventName::PointerLeave;
231        pointer_over => EventName::PointerOver;
232        pointer_out => EventName::PointerOut;
233    }
234
235    event_handlers! {
236        File,
237        FileEventData;
238
239        file_drop => EventName::FileDrop;
240        global_file_hover => EventName::GlobalFileHover;
241        global_file_hover_cancelled => EventName::GlobalFileHoverCancelled;
242    }
243
244    event_handlers! {
245        ImePreedit,
246        ImePreeditEventData;
247
248        ime_preedit => EventName::ImePreedit;
249    }
250
251    fn on_sized(mut self, on_sized: impl Into<EventHandler<Event<SizedEventData>>>) -> Self
252    where
253        Self: LayoutExt,
254    {
255        self.get_event_handlers()
256            .insert(EventName::Sized, EventHandlerType::Sized(on_sized.into()));
257        self.get_layout().layout.has_layout_references = true;
258        self
259    }
260
261    /// This is generally the best event in which to run "press" logic, this might be called `onClick`, `onActivate`, or `onConnect` in other platforms.
262    ///
263    /// Gets triggered when:
264    /// - **Click**: There is a `MouseUp` event (Left button) with the in the same element that there had been a `MouseDown` just before
265    /// - **Touched**: There is a `TouchEnd` event in the same element that there had been a `TouchStart` just before
266    /// - **Activated**: The element is focused and there is a keydown event pressing the OS activation key (e.g Space, Enter)
267    fn on_press(self, on_press: impl Into<EventHandler<Event<PressEventData>>>) -> Self {
268        let on_press = on_press.into();
269        self.on_pointer_press({
270            let on_press = on_press.clone();
271            move |e: Event<PointerEventData>| {
272                let event = e.try_map(|d| match d {
273                    PointerEventData::Mouse(m) if m.button == Some(MouseButton::Left) => {
274                        Some(PressEventData::Mouse(m))
275                    }
276                    PointerEventData::Touch(t) => Some(PressEventData::Touch(t)),
277                    _ => None,
278                });
279                if let Some(event) = event {
280                    on_press.call(event);
281                }
282            }
283        })
284        .on_key_down({
285            let on_press = on_press.clone();
286            move |e: Event<KeyboardEventData>| {
287                if Focus::is_pressed(&e) {
288                    on_press.call(e.map(PressEventData::Keyboard))
289                }
290            }
291        })
292    }
293
294    /// Also called the context menu click in other platforms.
295    /// Gets triggered when:
296    /// - **Click**: There is a `MouseUp` (Right button) event in the same element that there had been a `MouseDown` just before
297    fn on_secondary_press(
298        self,
299        on_pointer_press: impl Into<EventHandler<Event<PressEventData>>>,
300    ) -> Self {
301        let on_pointer_press = on_pointer_press.into();
302        self.on_pointer_press({
303            let on_pointer_press = on_pointer_press.clone();
304            move |e: Event<PointerEventData>| {
305                let event = e.try_map(|d| match d {
306                    PointerEventData::Mouse(m) if m.button == Some(MouseButton::Right) => {
307                        Some(PressEventData::Mouse(m))
308                    }
309                    _ => None,
310                });
311                if let Some(event) = event {
312                    on_pointer_press.call(event);
313                }
314            }
315        })
316    }
317
318    /// Gets triggered when:
319    /// - **Click**: There is a `MouseUp` event (Any button) with the in the same element that there had been a `MouseDown` just before
320    /// - **Touched**: There is a `TouchEnd` event in the same element that there had been a `TouchStart` just before
321    /// - **Activated**: The element is focused and there is a keydown event pressing the OS activation key (e.g Space, Enter)
322    fn on_all_press(self, on_press: impl Into<EventHandler<Event<PressEventData>>>) -> Self {
323        let on_press = on_press.into();
324        self.on_pointer_press({
325            let on_press = on_press.clone();
326            move |e: Event<PointerEventData>| {
327                let event = e.try_map(|d| match d {
328                    PointerEventData::Mouse(m) => Some(PressEventData::Mouse(m)),
329                    PointerEventData::Touch(t) => Some(PressEventData::Touch(t)),
330                });
331                if let Some(event) = event {
332                    on_press.call(event);
333                }
334            }
335        })
336        .on_key_down({
337            let on_press = on_press.clone();
338            move |e: Event<KeyboardEventData>| {
339                if Focus::is_pressed(&e) {
340                    on_press.call(e.map(PressEventData::Keyboard))
341                }
342            }
343        })
344    }
345}
346
347#[derive(Debug, Clone, PartialEq)]
348pub enum PressEventData {
349    Mouse(MouseEventData),
350    Keyboard(KeyboardEventData),
351    Touch(TouchEventData),
352}
353
354pub trait ContainerWithContentExt
355where
356    Self: LayoutExt,
357{
358    fn direction(mut self, direction: Direction) -> Self {
359        self.get_layout().layout.direction = direction;
360        self
361    }
362    fn main_align(mut self, main_align: Alignment) -> Self {
363        self.get_layout().layout.main_alignment = main_align;
364        self
365    }
366
367    fn cross_align(mut self, cross_align: Alignment) -> Self {
368        self.get_layout().layout.cross_alignment = cross_align;
369        self
370    }
371
372    fn spacing(mut self, spacing: impl Into<f32>) -> Self {
373        self.get_layout().layout.spacing = Length::new(spacing.into());
374        self
375    }
376
377    fn content(mut self, content: Content) -> Self {
378        self.get_layout().layout.content = content;
379        self
380    }
381    fn center(mut self) -> Self {
382        self.get_layout().layout.main_alignment = Alignment::Center;
383        self.get_layout().layout.cross_alignment = Alignment::Center;
384
385        self
386    }
387
388    fn offset_x(mut self, offset_x: impl Into<f32>) -> Self {
389        self.get_layout().layout.offset_x = Length::new(offset_x.into());
390        self
391    }
392
393    fn offset_y(mut self, offset_y: impl Into<f32>) -> Self {
394        self.get_layout().layout.offset_y = Length::new(offset_y.into());
395        self
396    }
397
398    fn vertical(mut self) -> Self {
399        self.get_layout().layout.direction = Direction::vertical();
400        self
401    }
402
403    fn horizontal(mut self) -> Self {
404        self.get_layout().layout.direction = Direction::horizontal();
405        self
406    }
407}
408
409pub trait ContainerSizeExt
410where
411    Self: LayoutExt,
412{
413    fn width(mut self, width: impl Into<Size>) -> Self {
414        self.get_layout().layout.width = width.into();
415        self
416    }
417
418    fn height(mut self, height: impl Into<Size>) -> Self {
419        self.get_layout().layout.height = height.into();
420        self
421    }
422
423    /// Expand both `width` and `height` using [Size::fill()].
424    fn expanded(mut self) -> Self {
425        self.get_layout().layout.width = Size::fill();
426        self.get_layout().layout.height = Size::fill();
427        self
428    }
429}
430
431impl<T: ContainerExt> ContainerSizeExt for T {}
432
433pub trait ContainerExt
434where
435    Self: LayoutExt,
436{
437    fn position(mut self, position: impl Into<Position>) -> Self {
438        self.get_layout().layout.position = position.into();
439        self
440    }
441
442    fn padding(mut self, padding: impl Into<Gaps>) -> Self {
443        self.get_layout().layout.padding = padding.into();
444        self
445    }
446
447    fn margin(mut self, margin: impl Into<Gaps>) -> Self {
448        self.get_layout().layout.margin = margin.into();
449        self
450    }
451
452    fn min_width(mut self, minimum_width: impl Into<Size>) -> Self {
453        self.get_layout().layout.minimum_width = minimum_width.into();
454        self
455    }
456
457    fn min_height(mut self, minimum_height: impl Into<Size>) -> Self {
458        self.get_layout().layout.minimum_height = minimum_height.into();
459        self
460    }
461
462    fn max_width(mut self, maximum_width: impl Into<Size>) -> Self {
463        self.get_layout().layout.maximum_width = maximum_width.into();
464        self
465    }
466
467    fn max_height(mut self, maximum_height: impl Into<Size>) -> Self {
468        self.get_layout().layout.maximum_height = maximum_height.into();
469        self
470    }
471
472    fn visible_width(mut self, visible_width: impl Into<VisibleSize>) -> Self {
473        self.get_layout().layout.visible_width = visible_width.into();
474        self
475    }
476
477    fn visible_height(mut self, visible_height: impl Into<VisibleSize>) -> Self {
478        self.get_layout().layout.visible_height = visible_height.into();
479        self
480    }
481}
482
483pub trait LayoutExt
484where
485    Self: Sized,
486{
487    fn get_layout(&mut self) -> &mut LayoutData;
488
489    fn layout(mut self, layout: LayoutData) -> Self {
490        *self.get_layout() = layout;
491        self
492    }
493}
494
495pub trait ImageExt
496where
497    Self: LayoutExt,
498{
499    fn get_image_data(&mut self) -> &mut ImageData;
500
501    fn image_data(mut self, image_data: ImageData) -> Self {
502        *self.get_image_data() = image_data;
503        self
504    }
505
506    fn sampling_mode(mut self, sampling_mode: SamplingMode) -> Self {
507        self.get_image_data().sampling_mode = sampling_mode;
508        self
509    }
510
511    fn aspect_ratio(mut self, aspect_ratio: AspectRatio) -> Self {
512        self.get_image_data().aspect_ratio = aspect_ratio;
513        self
514    }
515
516    fn image_cover(mut self, image_cover: ImageCover) -> Self {
517        self.get_image_data().image_cover = image_cover;
518        self
519    }
520}
521
522pub trait AccessibilityExt: Sized {
523    fn get_accessibility_data(&mut self) -> &mut AccessibilityData;
524
525    fn accessibility(mut self, accessibility: AccessibilityData) -> Self {
526        *self.get_accessibility_data() = accessibility;
527        self
528    }
529
530    fn a11y_id(mut self, a11y_id: impl Into<Option<AccessibilityId>>) -> Self {
531        self.get_accessibility_data().a11y_id = a11y_id.into();
532        self
533    }
534
535    fn a11y_focusable(mut self, a11y_focusable: impl Into<Focusable>) -> Self {
536        self.get_accessibility_data().a11y_focusable = a11y_focusable.into();
537        self
538    }
539
540    fn a11y_auto_focus(mut self, a11y_auto_focus: impl Into<bool>) -> Self {
541        self.get_accessibility_data().a11y_auto_focus = a11y_auto_focus.into();
542        self
543    }
544
545    fn a11y_member_of(mut self, a11y_member_of: impl Into<AccessibilityId>) -> Self {
546        self.get_accessibility_data()
547            .builder
548            .set_member_of(a11y_member_of.into());
549        self
550    }
551
552    fn a11y_role(mut self, a11y_role: impl Into<AccessibilityRole>) -> Self {
553        self.get_accessibility_data()
554            .builder
555            .set_role(a11y_role.into());
556        self
557    }
558
559    fn a11y_alt(mut self, value: impl Into<Box<str>>) -> Self {
560        self.get_accessibility_data().builder.set_label(value);
561        self
562    }
563
564    fn a11y_builder(mut self, with: impl FnOnce(&mut accesskit::Node)) -> Self {
565        with(&mut self.get_accessibility_data().builder);
566        self
567    }
568}
569
570pub trait TextStyleExt
571where
572    Self: Sized,
573{
574    fn get_text_style_data(&mut self) -> &mut TextStyleData;
575
576    fn color(mut self, color: impl Into<Color>) -> Self {
577        self.get_text_style_data().color = Some(color.into());
578        self
579    }
580
581    fn text_align(mut self, text_align: impl Into<TextAlign>) -> Self {
582        self.get_text_style_data().text_align = Some(text_align.into());
583        self
584    }
585
586    fn font_size(mut self, font_size: impl Into<FontSize>) -> Self {
587        self.get_text_style_data().font_size = Some(font_size.into());
588        self
589    }
590
591    fn font_family(mut self, font_family: impl Into<Cow<'static, str>>) -> Self {
592        self.get_text_style_data()
593            .font_families
594            .push(font_family.into());
595        self
596    }
597
598    fn font_slant(mut self, font_slant: impl Into<FontSlant>) -> Self {
599        self.get_text_style_data().font_slant = Some(font_slant.into());
600        self
601    }
602
603    fn font_weight(mut self, font_weight: impl Into<FontWeight>) -> Self {
604        self.get_text_style_data().font_weight = Some(font_weight.into());
605        self
606    }
607
608    fn font_width(mut self, font_width: impl Into<FontWidth>) -> Self {
609        self.get_text_style_data().font_width = Some(font_width.into());
610        self
611    }
612
613    fn text_height(mut self, text_height: impl Into<TextHeightBehavior>) -> Self {
614        self.get_text_style_data().text_height = Some(text_height.into());
615        self
616    }
617
618    fn text_overflow(mut self, text_overflow: impl Into<TextOverflow>) -> Self {
619        self.get_text_style_data().text_overflow = Some(text_overflow.into());
620        self
621    }
622
623    fn text_shadow(mut self, text_shadow: impl Into<TextShadow>) -> Self {
624        self.get_text_style_data()
625            .text_shadows
626            .push(text_shadow.into());
627        self
628    }
629}
630
631pub trait StyleExt
632where
633    Self: Sized,
634{
635    fn get_style(&mut self) -> &mut StyleState;
636
637    fn background<S: Into<Color>>(mut self, background: S) -> Self {
638        self.get_style().background = Fill::Color(background.into());
639        self
640    }
641
642    fn background_conic_gradient<S: Into<ConicGradient>>(mut self, background: S) -> Self {
643        self.get_style().background = Fill::ConicGradient(Box::new(background.into()));
644        self
645    }
646
647    fn background_linear_gradient<S: Into<LinearGradient>>(mut self, background: S) -> Self {
648        self.get_style().background = Fill::LinearGradient(Box::new(background.into()));
649        self
650    }
651
652    fn background_radial_gradient<S: Into<RadialGradient>>(mut self, background: S) -> Self {
653        self.get_style().background = Fill::RadialGradient(Box::new(background.into()));
654        self
655    }
656
657    fn border(mut self, border: impl Into<Option<Border>>) -> Self {
658        if let Some(border) = border.into() {
659            self.get_style().borders.push(border);
660        }
661        self
662    }
663
664    fn shadow(mut self, shadow: impl Into<Shadow>) -> Self {
665        self.get_style().shadows.push(shadow.into());
666        self
667    }
668
669    fn corner_radius(mut self, corner_radius: impl Into<CornerRadius>) -> Self {
670        self.get_style().corner_radius = corner_radius.into();
671        self
672    }
673}
674
675impl<T: StyleExt> CornerRadiusExt for T {
676    fn with_corner_radius(mut self, corner_radius: f32) -> Self {
677        self.get_style().corner_radius = CornerRadius::new_all(corner_radius);
678        self
679    }
680}
681
682pub trait CornerRadiusExt: Sized {
683    fn with_corner_radius(self, corner_radius: f32) -> Self;
684
685    /// Shortcut for `corner_radius(0.)` - removes border radius.
686    fn rounded_none(self) -> Self {
687        self.with_corner_radius(0.)
688    }
689
690    /// Shortcut for `corner_radius(6.)` - default border radius.
691    fn rounded(self) -> Self {
692        self.with_corner_radius(6.)
693    }
694
695    /// Shortcut for `corner_radius(4.)` - small border radius.
696    fn rounded_sm(self) -> Self {
697        self.with_corner_radius(4.)
698    }
699
700    /// Shortcut for `corner_radius(6.)` - medium border radius.
701    fn rounded_md(self) -> Self {
702        self.with_corner_radius(6.)
703    }
704
705    /// Shortcut for `corner_radius(8.)` - large border radius.
706    fn rounded_lg(self) -> Self {
707        self.with_corner_radius(8.)
708    }
709
710    /// Shortcut for `corner_radius(12.)` - extra large border radius.
711    fn rounded_xl(self) -> Self {
712        self.with_corner_radius(12.)
713    }
714
715    /// Shortcut for `corner_radius(16.)` - extra large border radius.
716    fn rounded_2xl(self) -> Self {
717        self.with_corner_radius(16.)
718    }
719
720    /// Shortcut for `corner_radius(24.)` - extra large border radius.
721    fn rounded_3xl(self) -> Self {
722        self.with_corner_radius(24.)
723    }
724
725    /// Shortcut for `corner_radius(32.)` - extra large border radius.
726    fn rounded_4xl(self) -> Self {
727        self.with_corner_radius(32.)
728    }
729
730    /// Shortcut for `corner_radius(99.)` - fully rounded (pill shape).
731    fn rounded_full(self) -> Self {
732        self.with_corner_radius(99.)
733    }
734}
735
736pub trait MaybeExt
737where
738    Self: Sized,
739{
740    fn maybe(self, bool: impl Into<bool>, then: impl FnOnce(Self) -> Self) -> Self {
741        if bool.into() { then(self) } else { self }
742    }
743
744    fn map<T>(self, data: Option<T>, then: impl FnOnce(Self, T) -> Self) -> Self {
745        if let Some(data) = data {
746            then(self, data)
747        } else {
748            self
749        }
750    }
751}
752
753pub trait LayerExt
754where
755    Self: Sized,
756{
757    fn get_layer(&mut self) -> &mut Layer;
758
759    fn layer(mut self, layer: impl Into<Layer>) -> Self {
760        *self.get_layer() = layer.into();
761        self
762    }
763}
764
765pub trait ScrollableExt
766where
767    Self: Sized,
768{
769    fn get_effect(&mut self) -> &mut EffectData;
770
771    fn scrollable(mut self, scrollable: impl Into<bool>) -> Self {
772        self.get_effect().scrollable = scrollable.into();
773        self
774    }
775}
776
777pub trait InteractiveExt
778where
779    Self: Sized,
780{
781    fn get_effect(&mut self) -> &mut EffectData;
782
783    fn interactive(mut self, interactive: impl Into<Interactive>) -> Self {
784        self.get_effect().interactive = interactive.into();
785        self
786    }
787}
788
789pub trait EffectExt: Sized {
790    fn get_effect(&mut self) -> &mut EffectData;
791
792    fn effect(mut self, effect: EffectData) -> Self {
793        *self.get_effect() = effect;
794        self
795    }
796
797    fn overflow(mut self, overflow: impl Into<Overflow>) -> Self {
798        self.get_effect().overflow = overflow.into();
799        self
800    }
801
802    fn blur(mut self, blur: impl Into<f32>) -> Self {
803        self.get_effect().blur = Some(blur.into());
804        self
805    }
806
807    fn rotation(mut self, rotation: impl Into<f32>) -> Self {
808        self.get_effect().rotation = Some(rotation.into());
809        self
810    }
811
812    fn opacity(mut self, opacity: impl Into<f32>) -> Self {
813        self.get_effect().opacity = Some(opacity.into());
814        self
815    }
816
817    fn scale(mut self, scale: impl Into<Scale>) -> Self {
818        self.get_effect().scale = Some(scale.into());
819        self
820    }
821}