Add the onvisible event handler to Element (#2911)

* Add the `onvisible` event using the IntersectionObserver

* Add a visible example

This example is based on https://codepen.io/ryanfinni/pen/VwZeGxN

* Remove web-sys CustomEvent feature for html package

* update js bindings and hash

* Use dioxus doc instead of lorem ipsum

* Fix clippy warning

* Add get_target method to the event data

* Make `get_time` return an Instant instead of a f64

* fix merge conflicts, compilinga

* remove target

* small nits

* serialzie as time_ms

* fix timing, works on desktop

* remove latent nits, fix hash

* box size clippy

* fix browserlist cargo.lock

---------

Co-authored-by: Evan Almloff <evanalmloff@gmail.com>
Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

Cargo.toml

@@ -436,6 +436,10 @@ doc-scrape-examples = true
 name = "streams"
 doc-scrape-examples = true
 
+[[example]]
+name = "visible"
+doc-scrape-examples = true
+
 [[example]]
 name = "window_event"
 required-features = ["desktop"]

examples/assets/visible.css

@@ -0,0 +1,27 @@
+* {
+  box-sizing: border-box;
+}
+
+.container {
+  height: 500px;
+  width: 500px;
+  margin: 100px auto;
+}
+
+p {
+  line-height: 30px;
+
+}
+
+.animated-text {
+  font-size: 30px;
+  text-align: center;
+  opacity: 0;
+  transform: translateY(100px);
+  transition: opacity 1s ease, transform 1s ease;
+}
+
+.animated-text.visible {
+  opacity: 1;
+  transform: translateX(0);
+}

examples/clock.rs

@@ -1,5 +1,4 @@
 //! A simple little clock that updates the time every few milliseconds.
-//!
 
 use async_std::task::sleep;
 use dioxus::prelude::*;

examples/visible.rs

@@ -0,0 +1,86 @@
+//! Port of the https://codepen.io/ryanfinni/pen/VwZeGxN example
+
+use dioxus::prelude::*;
+
+fn main() {
+    dioxus::launch(app);
+}
+
+fn app() -> Element {
+    let mut animated_classes = use_signal(|| ["animated-text", ""]);
+
+    rsx! {
+        document::Link { rel: "stylesheet", href: asset!("./examples/assets/visible.css") }
+
+        div {
+            class: "container",
+
+            p {
+                "Scroll to the bottom of the page. The text will transition in when it becomes visible in the viewport."
+            }
+
+            p {
+                "First, let's create a new project for our hacker news app. We can use the CLI to create a new
+                project. You can select a platform of your choice or view the getting started guide for more information
+                on each option. If you aren't sure what platform to try out, we recommend getting started with web or
+                desktop:"
+            }
+
+            p {
+                "The template contains some boilerplate to help you get started. For this guide, we will be rebuilding some of the code
+                from scratch for learning purposes. You can clear the src/main.rs file. We will be adding new code in the next
+                sections."
+            }
+
+            p {
+                "Next, let's setup our dependencies. We need to set up a few dependencies to work with the hacker news API: "
+            }
+
+            p {
+                "First, let's create a new project for our hacker news app. We can use the CLI to create a new
+                project. You can select a platform of your choice or view the getting started guide for more information
+                on each option. If you aren't sure what platform to try out, we recommend getting started with web or
+                desktop:"
+            }
+
+            p {
+                "The template contains some boilerplate to help you get started. For this guide, we will be rebuilding some of the code
+                from scratch for learning purposes. You can clear the src/main.rs file. We will be adding new code in the next
+                sections."
+            }
+
+            p {
+                "Next, let's setup our dependencies. We need to set up a few dependencies to work with the hacker news API: "
+            }
+
+            p {
+                "First, let's create a new project for our hacker news app. We can use the CLI to create a new
+                project. You can select a platform of your choice or view the getting started guide for more information
+                on each option. If you aren't sure what platform to try out, we recommend getting started with web or
+                desktop:"
+            }
+
+            p {
+                "The template contains some boilerplate to help you get started. For this guide, we will be rebuilding some of the code
+                from scratch for learning purposes. You can clear the src/main.rs file. We will be adding new code in the next
+                sections."
+            }
+
+            p {
+                "Next, let's setup our dependencies. We need to set up a few dependencies to work with the hacker news API: "
+            }
+
+            h2 {
+                class: animated_classes().join(" "),
+                onvisible: move |evt| {
+                    let data = evt.data();
+                    if let Ok(is_intersecting) = data.is_intersecting() {
+                        animated_classes.write()[1] = if is_intersecting { "visible" } else { "" };
+                    }
+                },
+
+                "Animated Text"
+            }
+        }
+    }
+}

packages/core-types/src/bubbles.rs

@@ -95,6 +95,7 @@ pub fn event_bubbles(evt: &str) -> bool {
         "transitionend" => true,
         "toggle" => true,
         "mounted" => false,
+        "visible" => false,
         _ => true,
     }
 }

packages/desktop/src/events.rs

@@ -161,6 +161,14 @@ impl HtmlEventConverter for SerializedHtmlEventConverter {
             .into()
     }
 
+    fn convert_visible_data(&self, event: &PlatformEventData) -> VisibleData {
+        event
+            .downcast::<SerializedVisibleData>()
+            .cloned()
+            .unwrap()
+            .into()
+    }
+
     fn convert_wheel_data(&self, event: &PlatformEventData) -> WheelData {
         event
             .downcast::<SerializedWheelData>()

packages/html/src/events/mod.rs

@@ -146,6 +146,8 @@ pub trait HtmlEventConverter: Send + Sync {
     fn convert_touch_data(&self, event: &PlatformEventData) -> TouchData;
     /// Convert a general event to a transition data event
     fn convert_transition_data(&self, event: &PlatformEventData) -> TransitionData;
+    /// Convert a general event to a visible data event
+    fn convert_visible_data(&self, event: &PlatformEventData) -> VisibleData;
     /// Convert a general event to a wheel data event
     fn convert_wheel_data(&self, event: &PlatformEventData) -> WheelData;
 }
@@ -258,6 +260,12 @@ impl From<&PlatformEventData> for TransitionData {
     }
 }
 
+impl From<&PlatformEventData> for VisibleData {
+    fn from(val: &PlatformEventData) -> Self {
+        with_event_converter(|c| c.convert_visible_data(val))
+    }
+}
+
 impl From<&PlatformEventData> for WheelData {
     fn from(val: &PlatformEventData) -> Self {
         with_event_converter(|c| c.convert_wheel_data(val))
@@ -282,6 +290,7 @@ mod selection;
 mod toggle;
 mod touch;
 mod transition;
+mod visible;
 mod wheel;
 
 pub use animation::*;
@@ -302,4 +311,5 @@ pub use selection::*;
 pub use toggle::*;
 pub use touch::*;
 pub use transition::*;
+pub use visible::*;
 pub use wheel::*;

packages/html/src/events/visible.rs

@@ -0,0 +1,307 @@
+use std::{
+    fmt::{Display, Formatter},
+    time::SystemTime,
+};
+
+pub struct VisibleData {
+    inner: Box<dyn HasVisibleData>,
+}
+
+impl<E: HasVisibleData> From<E> for VisibleData {
+    fn from(e: E) -> Self {
+        Self { inner: Box::new(e) }
+    }
+}
+
+impl VisibleData {
+    /// Create a new VisibleData
+    pub fn new(inner: impl HasVisibleData + 'static) -> Self {
+        Self {
+            inner: Box::new(inner),
+        }
+    }
+
+    /// Get the bounds rectangle of the target element
+    pub fn get_bounding_client_rect(&self) -> VisibleResult<PixelsRect> {
+        self.inner.get_bounding_client_rect()
+    }
+
+    /// Get the ratio of the intersectionRect to the boundingClientRect
+    pub fn get_intersection_ratio(&self) -> VisibleResult<f64> {
+        self.inner.get_intersection_ratio()
+    }
+
+    /// Get the rect representing the target's visible area
+    pub fn get_intersection_rect(&self) -> VisibleResult<PixelsRect> {
+        self.inner.get_intersection_rect()
+    }
+
+    /// Get if the target element intersects with the intersection observer's root
+    pub fn is_intersecting(&self) -> VisibleResult<bool> {
+        self.inner.is_intersecting()
+    }
+
+    /// Get the rect for the intersection observer's root
+    pub fn get_root_bounds(&self) -> VisibleResult<PixelsRect> {
+        self.inner.get_root_bounds()
+    }
+
+    /// Get a timestamp indicating the time at which the intersection was recorded
+    pub fn get_time(&self) -> VisibleResult<SystemTime> {
+        self.inner.get_time()
+    }
+
+    /// Downcast this event to a concrete event type
+    pub fn downcast<T: 'static>(&self) -> Option<&T> {
+        self.inner.as_any().downcast_ref::<T>()
+    }
+}
+
+impl std::fmt::Debug for VisibleData {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("VisibleData")
+            .field(
+                "bounding_client_rect",
+                &self.inner.get_bounding_client_rect(),
+            )
+            .field("intersection_ratio", &self.inner.get_intersection_ratio())
+            .field("intersection_rect", &self.inner.get_intersection_rect())
+            .field("is_intersecting", &self.inner.is_intersecting())
+            .field("root_bounds", &self.inner.get_root_bounds())
+            .field("time", &self.inner.get_time())
+            .finish()
+    }
+}
+
+impl PartialEq for VisibleData {
+    fn eq(&self, _: &Self) -> bool {
+        true
+    }
+}
+
+#[cfg(feature = "serialize")]
+#[derive(serde::Serialize, serde::Deserialize, Debug, PartialEq, Clone)]
+pub struct DOMRect {
+    bottom: f64, // The bottom coordinate value of the DOMRect (usually the same as y + height)
+    height: f64, // The height of the DOMRect
+    left: f64,   // The left coordinate value of the DOMRect (usually the same as x)
+    right: f64,  // The right coordinate value of the DOMRect (usually the same as x + width)
+    top: f64,    // The top coordinate value of the DOMRect (usually the same as y)
+    width: f64,  // The width of the DOMRect
+    x: f64,      // The x coordinate of the DOMRect's origin
+    y: f64,      // The y coordinate of the DOMRect's origin
+}
+
+#[cfg(feature = "serialize")]
+impl From<PixelsRect> for DOMRect {
+    fn from(rect: PixelsRect) -> Self {
+        let x = rect.origin.x;
+        let y = rect.origin.y;
+        let height = rect.height();
+        let width = rect.width();
+
+        Self {
+            bottom: y + height,
+            height,
+            left: x,
+            right: x + width,
+            top: y,
+            width,
+            x,
+            y,
+        }
+    }
+}
+
+#[cfg(feature = "serialize")]
+impl From<&DOMRect> for PixelsRect {
+    fn from(rect: &DOMRect) -> Self {
+        PixelsRect::new(
+            euclid::Point2D::new(rect.x, rect.y),
+            euclid::Size2D::new(rect.width, rect.height),
+        )
+    }
+}
+
+#[cfg(feature = "serialize")]
+/// A serialized version of VisibleData
+#[derive(serde::Serialize, serde::Deserialize, Debug, PartialEq, Clone)]
+pub struct SerializedVisibleData {
+    pub bounding_client_rect: DOMRect,
+    pub intersection_ratio: f64,
+    pub intersection_rect: DOMRect,
+    pub is_intersecting: bool,
+    pub root_bounds: DOMRect,
+    pub time_ms: u128,
+}
+
+#[cfg(feature = "serialize")]
+impl SerializedVisibleData {
+    /// Create a new SerializedVisibleData
+    pub fn new(
+        bounding_client_rect: DOMRect,
+        intersection_ratio: f64,
+        intersection_rect: DOMRect,
+        is_intersecting: bool,
+        root_bounds: DOMRect,
+        time_ms: u128,
+    ) -> Self {
+        Self {
+            bounding_client_rect,
+            intersection_ratio,
+            intersection_rect,
+            is_intersecting,
+            root_bounds,
+            time_ms,
+        }
+    }
+}
+
+#[cfg(feature = "serialize")]
+impl From<&VisibleData> for SerializedVisibleData {
+    fn from(data: &VisibleData) -> Self {
+        Self::new(
+            data.get_bounding_client_rect().unwrap().into(),
+            data.get_intersection_ratio().unwrap(),
+            data.get_intersection_rect().unwrap().into(),
+            data.is_intersecting().unwrap(),
+            data.get_root_bounds().unwrap().into(),
+            data.get_time().unwrap().elapsed().unwrap().as_millis(),
+        )
+    }
+}
+
+#[cfg(feature = "serialize")]
+impl HasVisibleData for SerializedVisibleData {
+    /// Get the bounds rectangle of the target element
+    fn get_bounding_client_rect(&self) -> VisibleResult<PixelsRect> {
+        Ok((&self.bounding_client_rect).into())
+    }
+
+    /// Get the ratio of the intersectionRect to the boundingClientRect
+    fn get_intersection_ratio(&self) -> VisibleResult<f64> {
+        Ok(self.intersection_ratio)
+    }
+
+    /// Get the rect representing the target's visible area
+    fn get_intersection_rect(&self) -> VisibleResult<PixelsRect> {
+        Ok((&self.intersection_rect).into())
+    }
+
+    /// Get if the target element intersects with the intersection observer's root
+    fn is_intersecting(&self) -> VisibleResult<bool> {
+        Ok(self.is_intersecting)
+    }
+
+    /// Get the rect for the intersection observer's root
+    fn get_root_bounds(&self) -> VisibleResult<PixelsRect> {
+        Ok((&self.root_bounds).into())
+    }
+
+    /// Get a timestamp indicating the time at which the intersection was recorded
+    fn get_time(&self) -> VisibleResult<SystemTime> {
+        Ok(SystemTime::UNIX_EPOCH + std::time::Duration::from_millis(self.time_ms as u64))
+    }
+
+    fn as_any(&self) -> &dyn std::any::Any {
+        self
+    }
+}
+
+#[cfg(feature = "serialize")]
+impl serde::Serialize for VisibleData {
+    fn serialize<S: serde::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        SerializedVisibleData::from(self).serialize(serializer)
+    }
+}
+
+#[cfg(feature = "serialize")]
+impl<'de> serde::Deserialize<'de> for VisibleData {
+    fn deserialize<D: serde::Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
+        let data = SerializedVisibleData::deserialize(deserializer)?;
+        Ok(Self {
+            inner: Box::new(data),
+        })
+    }
+}
+
+pub trait HasVisibleData: std::any::Any {
+    /// Get the bounds rectangle of the target element
+    fn get_bounding_client_rect(&self) -> VisibleResult<PixelsRect> {
+        Err(VisibleError::NotSupported)
+    }
+
+    /// Get the ratio of the intersectionRect to the boundingClientRect
+    fn get_intersection_ratio(&self) -> VisibleResult<f64> {
+        Err(VisibleError::NotSupported)
+    }
+
+    /// Get the rect representing the target's visible area
+    fn get_intersection_rect(&self) -> VisibleResult<PixelsRect> {
+        Err(VisibleError::NotSupported)
+    }
+
+    /// Get if the target element intersects with the intersection observer's root
+    fn is_intersecting(&self) -> VisibleResult<bool> {
+        Err(VisibleError::NotSupported)
+    }
+
+    /// Get the rect for the intersection observer's root
+    fn get_root_bounds(&self) -> VisibleResult<PixelsRect> {
+        Err(VisibleError::NotSupported)
+    }
+
+    /// Get a timestamp indicating the time at which the intersection was recorded
+    fn get_time(&self) -> VisibleResult<SystemTime> {
+        Err(VisibleError::NotSupported)
+    }
+
+    /// return self as Any
+    fn as_any(&self) -> &dyn std::any::Any;
+}
+
+use dioxus_core::Event;
+
+use crate::geometry::PixelsRect;
+
+pub type VisibleEvent = Event<VisibleData>;
+
+impl_event! {
+    VisibleData;
+
+    /// onvisible
+    onvisible
+}
+
+/// The VisibleResult type for the VisibleData
+pub type VisibleResult<T> = Result<T, VisibleError>;
+
+#[derive(Debug)]
+/// The error type for the VisibleData
+#[non_exhaustive]
+pub enum VisibleError {
+    /// The renderer does not support the requested operation
+    NotSupported,
+    /// The element was not found
+    OperationFailed(Box<dyn std::error::Error>),
+    /// The target element had no associated ElementId
+    NoElementId,
+}
+
+impl Display for VisibleError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            VisibleError::NotSupported => {
+                write!(f, "The renderer does not support the requested operation")
+            }
+            VisibleError::OperationFailed(e) => {
+                write!(f, "The operation failed: {}", e)
+            }
+            VisibleError::NoElementId => {
+                write!(f, "The target had no associated ElementId")
+            }
+        }
+    }
+}
+
+impl std::error::Error for VisibleError {}

packages/html/src/transit.rs

@@ -105,6 +105,9 @@ fn deserialize_raw(name: &str, data: &serde_json::Value) -> Result<EventData, se
         // Scroll
         "scroll" => Scroll(de(data)?),
 
+        // Visible
+        "visible" => Visible(de(data)?),
+
         // Wheel
         "wheel" => Wheel(de(data)?),
 
@@ -163,6 +166,7 @@ pub enum EventData {
     Touch(SerializedTouchData),
     Resize(SerializedResizeData),
     Scroll(SerializedScrollData),
+    Visible(SerializedVisibleData),
     Wheel(SerializedWheelData),
     Media(SerializedMediaData),
     Animation(SerializedAnimationData),
@@ -207,6 +211,9 @@ impl EventData {
             EventData::Scroll(data) => {
                 Rc::new(PlatformEventData::new(Box::new(data))) as Rc<dyn Any>
             }
+            EventData::Visible(data) => {
+                Rc::new(PlatformEventData::new(Box::new(data))) as Rc<dyn Any>
+            }
             EventData::Wheel(data) => {
                 Rc::new(PlatformEventData::new(Box::new(data))) as Rc<dyn Any>
             }
@@ -415,6 +422,14 @@ impl HtmlEventConverter for SerializedHtmlEventConverter {
             .into()
     }
 
+    fn convert_visible_data(&self, event: &PlatformEventData) -> VisibleData {
+        event
+            .downcast::<SerializedVisibleData>()
+            .cloned()
+            .unwrap()
+            .into()
+    }
+
     fn convert_wheel_data(&self, event: &PlatformEventData) -> WheelData {
         event
             .downcast::<SerializedWheelData>()

packages/interpreter/src/js/core.js

@@ -1 +1 @@
-function setAttributeInner(node,field,value,ns){if(ns==="style"){node.style.setProperty(field,value);return}if(ns){node.setAttributeNS(ns,field,value);return}switch(field){case"value":if(node.value!==value)node.value=value;break;case"initial_value":node.defaultValue=value;break;case"checked":node.checked=truthy(value);break;case"initial_checked":node.defaultChecked=truthy(value);break;case"selected":node.selected=truthy(value);break;case"initial_selected":node.defaultSelected=truthy(value);break;case"dangerous_inner_html":node.innerHTML=value;break;default:if(!truthy(value)&&isBoolAttr(field))node.removeAttribute(field);else node.setAttribute(field,value)}}var truthy=function(val){return val==="true"||val===!0},isBoolAttr=function(field){switch(field){case"allowfullscreen":case"allowpaymentrequest":case"async":case"autofocus":case"autoplay":case"checked":case"controls":case"default":case"defer":case"disabled":case"formnovalidate":case"hidden":case"ismap":case"itemscope":case"loop":case"multiple":case"muted":case"nomodule":case"novalidate":case"open":case"playsinline":case"readonly":case"required":case"reversed":case"selected":case"truespeed":case"webkitdirectory":return!0;default:return!1}};class BaseInterpreter{global;local;root;handler;resizeObserver;nodes;stack;templates;m;constructor(){}initialize(root,handler=null){this.global={},this.local={},this.root=root,this.nodes=[root],this.stack=[root],this.templates={},this.handler=handler}handleResizeEvent(entry){const target=entry.target;let event=new CustomEvent("resize",{bubbles:!1,detail:entry});target.dispatchEvent(event)}createObserver(element){if(!this.resizeObserver)this.resizeObserver=new ResizeObserver((entries)=>{for(let entry of entries)this.handleResizeEvent(entry)});this.resizeObserver.observe(element)}removeObserver(element){if(this.resizeObserver)this.resizeObserver.unobserve(element)}createListener(event_name,element,bubbles){if(bubbles)if(this.global[event_name]===void 0)this.global[event_name]={active:1,callback:this.handler},this.root.addEventListener(event_name,this.handler);else this.global[event_name].active++;else{const id=element.getAttribute("data-dioxus-id");if(!this.local[id])this.local[id]={};element.addEventListener(event_name,this.handler)}if(event_name=="resize")this.createObserver(element)}removeListener(element,event_name,bubbles){if(bubbles)this.removeBubblingListener(event_name);else this.removeNonBubblingListener(element,event_name)}removeBubblingListener(event_name){if(this.global[event_name].active--,this.global[event_name].active===0)this.root.removeEventListener(event_name,this.global[event_name].callback),delete this.global[event_name]}removeNonBubblingListener(element,event_name){const id=element.getAttribute("data-dioxus-id");if(delete this.local[id][event_name],Object.keys(this.local[id]).length===0)delete this.local[id];element.removeEventListener(event_name,this.handler)}removeAllNonBubblingListeners(element){const id=element.getAttribute("data-dioxus-id");delete this.local[id]}getNode(id){return this.nodes[id]}pushRoot(node){this.stack.push(node)}appendChildren(id,many){const root=this.nodes[id],els=this.stack.splice(this.stack.length-many);for(let k=0;k<many;k++)root.appendChild(els[k])}loadChild(ptr,len){let node=this.stack[this.stack.length-1],ptr_end=ptr+len;for(;ptr<ptr_end;ptr++){let end=this.m.getUint8(ptr);for(node=node.firstChild;end>0;end--)node=node.nextSibling}return node}saveTemplate(nodes,tmpl_id){this.templates[tmpl_id]=nodes}hydrate_node(hydrateNode,ids){const split=hydrateNode.getAttribute("data-node-hydration").split(","),id=ids[parseInt(split[0])];if(this.nodes[id]=hydrateNode,split.length>1){hydrateNode.listening=split.length-1,hydrateNode.setAttribute("data-dioxus-id",id.toString());for(let j=1;j<split.length;j++){const split2=split[j].split(":"),event_name=split2[0],bubbles=split2[1]==="1";this.createListener(event_name,hydrateNode,bubbles)}}}hydrate(ids,underNodes){for(let i=0;i<underNodes.length;i++){const under=underNodes[i];if(under instanceof HTMLElement){if(under.getAttribute("data-node-hydration"))this.hydrate_node(under,ids);const hydrateNodes=under.querySelectorAll("[data-node-hydration]");for(let i2=0;i2<hydrateNodes.length;i2++)this.hydrate_node(hydrateNodes[i2],ids)}const treeWalker=document.createTreeWalker(under,NodeFilter.SHOW_COMMENT);while(treeWalker.currentNode){const currentNode=treeWalker.currentNode;if(currentNode.nodeType===Node.COMMENT_NODE){const id=currentNode.textContent,placeholderSplit=id.split("placeholder");if(placeholderSplit.length>1){if(this.nodes[ids[parseInt(placeholderSplit[1])]]=currentNode,!treeWalker.nextNode())break;continue}const textNodeSplit=id.split("node-id");if(textNodeSplit.length>1){let next=currentNode.nextSibling;currentNode.remove();let commentAfterText,textNode;if(next.nodeType===Node.COMMENT_NODE){const newText=next.parentElement.insertBefore(document.createTextNode(""),next);commentAfterText=next,textNode=newText}else textNode=next,commLine truncated
+function setAttributeInner(node,field,value,ns){if(ns==="style"){node.style.setProperty(field,value);return}if(ns){node.setAttributeNS(ns,field,value);return}switch(field){case"value":if(node.value!==value)node.value=value;break;case"initial_value":node.defaultValue=value;break;case"checked":node.checked=truthy(value);break;case"initial_checked":node.defaultChecked=truthy(value);break;case"selected":node.selected=truthy(value);break;case"initial_selected":node.defaultSelected=truthy(value);break;case"dangerous_inner_html":node.innerHTML=value;break;default:if(!truthy(value)&&isBoolAttr(field))node.removeAttribute(field);else node.setAttribute(field,value)}}var truthy=function(val){return val==="true"||val===!0},isBoolAttr=function(field){switch(field){case"allowfullscreen":case"allowpaymentrequest":case"async":case"autofocus":case"autoplay":case"checked":case"controls":case"default":case"defer":case"disabled":case"formnovalidate":case"hidden":case"ismap":case"itemscope":case"loop":case"multiple":case"muted":case"nomodule":case"novalidate":case"open":case"playsinline":case"readonly":case"required":case"reversed":case"selected":case"truespeed":case"webkitdirectory":return!0;default:return!1}};class BaseInterpreter{global;local;root;handler;resizeObserver;intersectionObserver;nodes;stack;templates;m;constructor(){}initialize(root,handler=null){this.global={},this.local={},this.root=root,this.nodes=[root],this.stack=[root],this.templates={},this.handler=handler}handleResizeEvent(entry){const target=entry.target;let event=new CustomEvent("resize",{bubbles:!1,detail:entry});target.dispatchEvent(event)}createResizeObserver(element){if(!this.resizeObserver)this.resizeObserver=new ResizeObserver((entries)=>{for(let entry of entries)this.handleResizeEvent(entry)});this.resizeObserver.observe(element)}removeResizeObserver(element){if(this.resizeObserver)this.resizeObserver.unobserve(element)}handleIntersectionEvent(entry){const target=entry.target;let event=new CustomEvent("visible",{bubbles:!1,detail:entry});target.dispatchEvent(event)}createIntersectionObserver(element){if(!this.intersectionObserver)this.intersectionObserver=new IntersectionObserver((entries)=>{for(let entry of entries)this.handleIntersectionEvent(entry)});this.intersectionObserver.observe(element)}removeIntersectionObserver(element){if(this.intersectionObserver)this.intersectionObserver.unobserve(element)}createListener(event_name,element,bubbles){if(event_name=="resize")this.createResizeObserver(element);else if(event_name=="visible")this.createIntersectionObserver(element);if(bubbles)if(this.global[event_name]===void 0)this.global[event_name]={active:1,callback:this.handler},this.root.addEventListener(event_name,this.handler);else this.global[event_name].active++;else{const id=element.getAttribute("data-dioxus-id");if(!this.local[id])this.local[id]={};element.addEventListener(event_name,this.handler)}}removeListener(element,event_name,bubbles){if(event_name=="resize")this.removeResizeObserver(element);else if(event_name=="visible")this.removeIntersectionObserver(element);else if(bubbles)this.removeBubblingListener(event_name);else this.removeNonBubblingListener(element,event_name)}removeBubblingListener(event_name){if(this.global[event_name].active--,this.global[event_name].active===0)this.root.removeEventListener(event_name,this.global[event_name].callback),delete this.global[event_name]}removeNonBubblingListener(element,event_name){const id=element.getAttribute("data-dioxus-id");if(delete this.local[id][event_name],Object.keys(this.local[id]).length===0)delete this.local[id];element.removeEventListener(event_name,this.handler)}removeAllNonBubblingListeners(element){const id=element.getAttribute("data-dioxus-id");delete this.local[id]}getNode(id){return this.nodes[id]}pushRoot(node){this.stack.push(node)}appendChildren(id,many){const root=this.nodes[id],els=this.stack.splice(this.stack.length-many);for(let k=0;k<many;k++)root.appendChild(els[k])}loadChild(ptr,len){let node=this.stack[this.stack.length-1],ptr_end=ptr+len;for(;ptr<ptr_end;ptr++){let end=this.m.getUint8(ptr);for(node=node.firstChild;end>0;end--)node=node.nextSibling}return node}saveTemplate(nodes,tmpl_id){this.templates[tmpl_id]=nodes}hydrate_node(hydrateNode,ids){const split=hydrateNode.getAttribute("data-node-hydration").split(","),id=ids[parseInt(split[0])];if(this.nodes[id]=hydrateNode,split.length>1){hydrateNode.listening=split.length-1,hydrateNode.setAttribute("data-dioxus-id",id.toString());for(let j=1;j<split.length;j++){const split2=split[j].split(":"),event_name=split2[0],bubbles=split2[1]==="1";this.createListener(event_name,hydrateNode,bubbles)}}}hydrate(ids,underNodes){for(let i=0;i<underNodes.length;i++){const under=underNodes[i];if(under instanceof HTMLElement){if(under.getAttribute("data-node-hydration"))this.hydrate_node(under,ids);const hydrateNodes=under.querySelectorAll("[data-node-hydration]");for(let i2=0;i2<hydrateNodes.length;i2++)this.hydrate_node(hydrateNLine truncated

packages/interpreter/src/js/hash.txt

@@ -1 +1 @@
-[6449103750905854967, 4461869229701639737, 13069001215487072322, 8716623267269178440, 5336385715226370016, 14456089431355876478, 7422899642446454418, 5052021921702764563, 17534315583914394253, 5638004933879392817]
+[6449103750905854967, 5429983586723452597, 13069001215487072322, 8716623267269178440, 5336385715226370016, 14456089431355876478, 7422899642446454418, 5052021921702764563, 12925655762638175824, 5638004933879392817]

packages/interpreter/src/js/native.js

@@ -1 +1 @@
-function retrieveValues(event,target){let contents={values:{}},form=target.closest("form");if(form){if(event.type==="input"||event.type==="change"||event.type==="submit"||event.type==="reset"||event.type==="click")contents=retrieveFormValues(form)}return contents}function retrieveFormValues(form){const formData=new FormData(form),contents={};return formData.forEach((value,key)=>{if(contents[key])contents[key].push(value);else contents[key]=[value]}),{valid:form.checkValidity(),values:contents}}function retrieveSelectValue(target){let options=target.selectedOptions,values=[];for(let i=0;i<options.length;i++)values.push(options[i].value);return values}function serializeEvent(event,target){let contents={},extend=(obj)=>contents={...contents,...obj};if(event instanceof WheelEvent)extend(serializeWheelEvent(event));if(event instanceof MouseEvent)extend(serializeMouseEvent(event));if(event instanceof KeyboardEvent)extend(serializeKeyboardEvent(event));if(event instanceof InputEvent)extend(serializeInputEvent(event,target));if(event instanceof PointerEvent)extend(serializePointerEvent(event));if(event instanceof AnimationEvent)extend(serializeAnimationEvent(event));if(event instanceof TransitionEvent)extend({property_name:event.propertyName,elapsed_time:event.elapsedTime,pseudo_element:event.pseudoElement});if(event instanceof CompositionEvent)extend({data:event.data});if(event instanceof DragEvent)extend(serializeDragEvent(event));if(event instanceof FocusEvent)extend({});if(event instanceof ClipboardEvent)extend({});if(event instanceof CustomEvent){const detail=event.detail;if(detail instanceof ResizeObserverEntry)extend(serializeResizeEventDetail(detail))}if(typeof TouchEvent!=="undefined"&&event instanceof TouchEvent)extend(serializeTouchEvent(event));if(event.type==="submit"||event.type==="reset"||event.type==="click"||event.type==="change"||event.type==="input")extend(serializeInputEvent(event,target));if(event instanceof DragEvent);return contents}var toSerializableResizeObserverSize=function(size,is_inline_width){return[is_inline_width?size.inlineSize:size.blockSize,is_inline_width?size.blockSize:size.inlineSize]};function serializeResizeEventDetail(detail){let is_inline_width=!0;if(detail.target instanceof HTMLElement){if(window.getComputedStyle(detail.target).getPropertyValue("writing-mode")!=="horizontal-tb")is_inline_width=!1}return{border_box_size:detail.borderBoxSize!==void 0?toSerializableResizeObserverSize(detail.borderBoxSize[0],is_inline_width):detail.contentRect,content_box_size:detail.contentBoxSize!==void 0?toSerializableResizeObserverSize(detail.contentBoxSize[0],is_inline_width):detail.contentRect,content_rect:detail.contentRect}}var serializeInputEvent=function(event,target){let contents={};if(target instanceof HTMLElement){let values=retrieveValues(event,target);contents.values=values.values,contents.valid=values.valid}if(event.target instanceof HTMLInputElement){let target2=event.target,value=target2.value??target2.textContent??"";if(target2.type==="checkbox")value=target2.checked?"true":"false";else if(target2.type==="radio")value=target2.value;contents.value=value}if(event.target instanceof HTMLTextAreaElement)contents.value=event.target.value;if(event.target instanceof HTMLSelectElement)contents.value=retrieveSelectValue(event.target).join(",");if(contents.value===void 0)contents.value="";return contents},serializeWheelEvent=function(event){return{delta_x:event.deltaX,delta_y:event.deltaY,delta_z:event.deltaZ,delta_mode:event.deltaMode}},serializeTouchEvent=function(event){return{alt_key:event.altKey,ctrl_key:event.ctrlKey,meta_key:event.metaKey,shift_key:event.shiftKey,changed_touches:event.changedTouches,target_touches:event.targetTouches,touches:event.touches}},serializePointerEvent=function(event){return{alt_key:event.altKey,button:event.button,buttons:event.buttons,client_x:event.clientX,client_y:event.clientY,ctrl_key:event.ctrlKey,meta_key:event.metaKey,page_x:event.pageX,page_y:event.pageY,screen_x:event.screenX,screen_y:event.screenY,shift_key:event.shiftKey,pointer_id:event.pointerId,width:event.width,height:event.height,pressure:event.pressure,tangential_pressure:event.tangentialPressure,tilt_x:event.tiltX,tilt_y:event.tiltY,twist:event.twist,pointer_type:event.pointerType,is_primary:event.isPrimary}},serializeMouseEvent=function(event){return{alt_key:event.altKey,button:event.button,buttons:event.buttons,client_x:event.clientX,client_y:event.clientY,ctrl_key:event.ctrlKey,meta_key:event.metaKey,offset_x:event.offsetX,offset_y:event.offsetY,page_x:event.pageX,page_y:event.pageY,screen_x:event.screenX,screen_y:event.screenY,shift_key:event.shiftKey}},serializeKeyboardEvent=function(event){return{char_code:event.charCode,is_composing:event.isComposing,key:event.key,alt_key:event.altKey,ctrl_key:event.ctrlKey,meta_key:event.metaKey,key_code:event.keyCode,shift_key:event.shiftKey,location:event.location,repeat:event.repeat,which:event.which,code:event.code}},serializeAnimationELine truncated
+function retrieveValues(event,target){let contents={values:{}},form=target.closest("form");if(form){if(event.type==="input"||event.type==="change"||event.type==="submit"||event.type==="reset"||event.type==="click")contents=retrieveFormValues(form)}return contents}function retrieveFormValues(form){const formData=new FormData(form),contents={};return formData.forEach((value,key)=>{if(contents[key])contents[key].push(value);else contents[key]=[value]}),{valid:form.checkValidity(),values:contents}}function retrieveSelectValue(target){let options=target.selectedOptions,values=[];for(let i=0;i<options.length;i++)values.push(options[i].value);return values}function serializeEvent(event,target){let contents={},extend=(obj)=>contents={...contents,...obj};if(event instanceof WheelEvent)extend(serializeWheelEvent(event));if(event instanceof MouseEvent)extend(serializeMouseEvent(event));if(event instanceof KeyboardEvent)extend(serializeKeyboardEvent(event));if(event instanceof InputEvent)extend(serializeInputEvent(event,target));if(event instanceof PointerEvent)extend(serializePointerEvent(event));if(event instanceof AnimationEvent)extend(serializeAnimationEvent(event));if(event instanceof TransitionEvent)extend({property_name:event.propertyName,elapsed_time:event.elapsedTime,pseudo_element:event.pseudoElement});if(event instanceof CompositionEvent)extend({data:event.data});if(event instanceof DragEvent)extend(serializeDragEvent(event));if(event instanceof FocusEvent)extend({});if(event instanceof ClipboardEvent)extend({});if(event instanceof CustomEvent){const detail=event.detail;if(detail instanceof ResizeObserverEntry)extend(serializeResizeEventDetail(detail));else if(detail instanceof IntersectionObserverEntry)extend(serializeIntersectionEventDetail(detail))}if(typeof TouchEvent!=="undefined"&&event instanceof TouchEvent)extend(serializeTouchEvent(event));if(event.type==="submit"||event.type==="reset"||event.type==="click"||event.type==="change"||event.type==="input")extend(serializeInputEvent(event,target));if(event instanceof DragEvent);return contents}var toSerializableResizeObserverSize=function(size,is_inline_width){return[is_inline_width?size.inlineSize:size.blockSize,is_inline_width?size.blockSize:size.inlineSize]};function serializeResizeEventDetail(detail){let is_inline_width=!0;if(detail.target instanceof HTMLElement){if(window.getComputedStyle(detail.target).getPropertyValue("writing-mode")!=="horizontal-tb")is_inline_width=!1}return{border_box_size:detail.borderBoxSize!==void 0?toSerializableResizeObserverSize(detail.borderBoxSize[0],is_inline_width):detail.contentRect,content_box_size:detail.contentBoxSize!==void 0?toSerializableResizeObserverSize(detail.contentBoxSize[0],is_inline_width):detail.contentRect,content_rect:detail.contentRect}}function serializeIntersectionEventDetail(detail){return{bounding_client_rect:detail.boundingClientRect,intersection_ratio:detail.intersectionRatio,intersection_rect:detail.intersectionRect,is_intersecting:detail.isIntersecting,root_bounds:detail.rootBounds,time_ms:Math.floor(Date.now()+detail.time)}}var serializeInputEvent=function(event,target){let contents={};if(target instanceof HTMLElement){let values=retrieveValues(event,target);contents.values=values.values,contents.valid=values.valid}if(event.target instanceof HTMLInputElement){let target2=event.target,value=target2.value??target2.textContent??"";if(target2.type==="checkbox")value=target2.checked?"true":"false";else if(target2.type==="radio")value=target2.value;contents.value=value}if(event.target instanceof HTMLTextAreaElement)contents.value=event.target.value;if(event.target instanceof HTMLSelectElement)contents.value=retrieveSelectValue(event.target).join(",");if(contents.value===void 0)contents.value="";return contents},serializeWheelEvent=function(event){return{delta_x:event.deltaX,delta_y:event.deltaY,delta_z:event.deltaZ,delta_mode:event.deltaMode}},serializeTouchEvent=function(event){return{alt_key:event.altKey,ctrl_key:event.ctrlKey,meta_key:event.metaKey,shift_key:event.shiftKey,changed_touches:event.changedTouches,target_touches:event.targetTouches,touches:event.touches}},serializePointerEvent=function(event){return{alt_key:event.altKey,button:event.button,buttons:event.buttons,client_x:event.clientX,client_y:event.clientY,ctrl_key:event.ctrlKey,meta_key:event.metaKey,page_x:event.pageX,page_y:event.pageY,screen_x:event.screenX,screen_y:event.screenY,shift_key:event.shiftKey,pointer_id:event.pointerId,width:event.width,height:event.height,pressure:event.pressure,tangential_pressure:event.tangentialPressure,tilt_x:event.tiltX,tilt_y:event.tiltY,twist:event.twist,pointer_type:event.pointerType,is_primary:event.isPrimary}},serializeMouseEvent=function(event){return{alt_key:event.altKey,button:event.button,buttons:event.buttons,client_x:event.clientX,client_y:event.clientY,ctrl_key:event.ctrlKey,meta_key:event.metaKey,offset_x:event.offsetX,offset_y:event.offsetY,page_x:event.pageX,page_y:event.pageY,Line truncated

packages/interpreter/src/ts/core.ts

@@ -20,6 +20,7 @@ export class BaseInterpreter {
   root: HTMLElement;
   handler: EventListener;
   resizeObserver: ResizeObserver;
+  intersectionObserver: IntersectionObserver;
 
   nodes: Node[];
   stack: Node[];
@@ -55,7 +56,7 @@ export class BaseInterpreter {
     target.dispatchEvent(event);
   }
 
-  createObserver(element: HTMLElement) {
+  createResizeObserver(element: HTMLElement) {
     // Lazily create the resize observer
     if (!this.resizeObserver) {
       this.resizeObserver = new ResizeObserver((entries) => {
@@ -67,13 +68,48 @@ export class BaseInterpreter {
     this.resizeObserver.observe(element);
   }
 
-  removeObserver(element: HTMLElement) {
+  removeResizeObserver(element: HTMLElement) {
     if (this.resizeObserver) {
       this.resizeObserver.unobserve(element);
     }
   }
 
+  handleIntersectionEvent(entry: IntersectionObserverEntry) {
+    const target = entry.target;
+
+    let event = new CustomEvent<IntersectionObserverEntry>("visible", {
+      bubbles: false,
+      detail: entry,
+    });
+
+    target.dispatchEvent(event);
+  }
+
+  createIntersectionObserver(element: HTMLElement) {
+    /// Lazily create the intersection observer
+    if (!this.intersectionObserver) {
+      this.intersectionObserver = new IntersectionObserver((entries) => {
+        for (const entry of entries) {
+          this.handleIntersectionEvent(entry);
+        }
+      });
+    }
+    this.intersectionObserver.observe(element);
+  }
+
+  removeIntersectionObserver(element: HTMLElement) {
+    if (this.intersectionObserver) {
+      this.intersectionObserver.unobserve(element);
+    }
+  }
+
   createListener(event_name: string, element: HTMLElement, bubbles: boolean) {
+    if (event_name == "resize") {
+      this.createResizeObserver(element);
+    } else if (event_name == "visible") {
+      this.createIntersectionObserver(element);
+    }
+
     if (bubbles) {
       if (this.global[event_name] === undefined) {
         this.global[event_name] = { active: 1, callback: this.handler };
@@ -88,14 +124,14 @@ export class BaseInterpreter {
       }
       element.addEventListener(event_name, this.handler);
     }
-
-    if (event_name == "resize") {
-      this.createObserver(element);
-    }
   }
 
   removeListener(element: HTMLElement, event_name: string, bubbles: boolean) {
-    if (bubbles) {
+    if (event_name == "resize") {
+      this.removeResizeObserver(element);
+    } else if (event_name == "visible") {
+      this.removeIntersectionObserver(element);
+    } else if (bubbles) {
       this.removeBubblingListener(event_name);
     } else {
       this.removeNonBubblingListener(element, event_name);

packages/interpreter/src/ts/serialize.ts

@@ -62,6 +62,8 @@ export function serializeEvent(
     const detail = event.detail;
     if (detail instanceof ResizeObserverEntry) {
       extend(serializeResizeEventDetail(detail));
+    } else if (detail instanceof IntersectionObserverEntry) {
+      extend(serializeIntersectionEventDetail(detail));
     }
   }
 
@@ -129,21 +131,36 @@ export function serializeResizeEventDetail(
     border_box_size:
       detail.borderBoxSize !== undefined
         ? toSerializableResizeObserverSize(
-            detail.borderBoxSize[0],
-            is_inline_width
-          )
+          detail.borderBoxSize[0],
+          is_inline_width
+        )
         : detail.contentRect,
     content_box_size:
       detail.contentBoxSize !== undefined
         ? toSerializableResizeObserverSize(
-            detail.contentBoxSize[0],
-            is_inline_width
-          )
+          detail.contentBoxSize[0],
+          is_inline_width
+        )
         : detail.contentRect,
     content_rect: detail.contentRect,
   };
 }
 
+export function serializeIntersectionEventDetail(
+  detail: IntersectionObserverEntry): SerializedEvent {
+  return {
+    bounding_client_rect: detail.boundingClientRect,
+    intersection_ratio: detail.intersectionRatio,
+    intersection_rect: detail.intersectionRect,
+    is_intersecting: detail.isIntersecting,
+    root_bounds: detail.rootBounds,
+
+    // math.floor removes the floating point extra such that we serialize into integer
+    // this *might* become an issue longer term
+    time_ms: Math.floor(Date.now() + detail.time),
+  }
+}
+
 function serializeInputEvent(
   event: InputEvent,
   target: EventTarget

packages/liveview/src/events.rs

@@ -147,6 +147,14 @@ impl HtmlEventConverter for SerializedHtmlEventConverter {
             .into()
     }
 
+    fn convert_visible_data(&self, event: &PlatformEventData) -> VisibleData {
+        event
+            .downcast::<SerializedVisibleData>()
+            .cloned()
+            .unwrap()
+            .into()
+    }
+
     fn convert_wheel_data(&self, event: &PlatformEventData) -> WheelData {
         event
             .downcast::<SerializedWheelData>()

packages/liveview/src/pool.rs

@@ -152,7 +152,7 @@ pub async fn run(mut vdom: VirtualDom, ws: impl LiveViewSocket) -> Result<(), Li
     #[serde(tag = "method", content = "params")]
     enum IpcMessage {
         #[serde(rename = "user_event")]
-        Event(HtmlEvent),
+        Event(Box<HtmlEvent>),
         #[serde(rename = "query")]
         Query(QueryResult),
     }

packages/web/Cargo.toml

@@ -63,6 +63,7 @@ features = [
     "HtmlInputElement",
     "HtmlSelectElement",
     "HtmlTextAreaElement",
+    "IntersectionObserverEntry",
     "InputEvent",
     "KeyboardEvent",
     "MouseEvent",

packages/web/src/events/mod.rs

@@ -25,6 +25,7 @@ mod selection;
 mod toggle;
 mod touch;
 mod transition;
+mod visible;
 mod wheel;
 
 /// A wrapper for the websys event that allows us to give it the impls from dioxus-html
@@ -190,6 +191,15 @@ impl HtmlEventConverter for WebEventConverter {
         Synthetic::<web_sys::TransitionEvent>::from(downcast_event(event).raw.clone()).into()
     }
 
+    #[inline(always)]
+    fn convert_visible_data(
+        &self,
+        event: &dioxus_html::PlatformEventData,
+    ) -> dioxus_html::VisibleData {
+        Synthetic::<web_sys::IntersectionObserverEntry>::from(downcast_event(event).raw.clone())
+            .into()
+    }
+
     #[inline(always)]
     fn convert_wheel_data(&self, event: &dioxus_html::PlatformEventData) -> dioxus_html::WheelData {
         Synthetic::<web_sys::WheelEvent>::from(downcast_event(event).raw.clone()).into()

packages/web/src/events/visible.rs

@@ -0,0 +1,89 @@
+use std::time::SystemTime;
+
+use dioxus_html::{
+    geometry::{
+        euclid::{Point2D, Size2D},
+        PixelsRect,
+    },
+    HasVisibleData, VisibleData, VisibleError, VisibleResult,
+};
+use wasm_bindgen::JsCast;
+use web_sys::{CustomEvent, DomRectReadOnly, Event, IntersectionObserverEntry};
+
+use super::{Synthetic, WebEventExt};
+
+impl From<Event> for Synthetic<IntersectionObserverEntry> {
+    #[inline]
+    fn from(e: Event) -> Self {
+        <Synthetic<IntersectionObserverEntry> as From<&Event>>::from(&e)
+    }
+}
+
+impl From<&Event> for Synthetic<IntersectionObserverEntry> {
+    #[inline]
+    fn from(e: &Event) -> Self {
+        let e: &CustomEvent = e.unchecked_ref();
+        let value = e.detail();
+        Self::new(value.unchecked_into::<IntersectionObserverEntry>())
+    }
+}
+fn dom_rect_ro_to_pixel_rect(dom_rect: &DomRectReadOnly) -> PixelsRect {
+    PixelsRect::new(
+        Point2D::new(dom_rect.x(), dom_rect.y()),
+        Size2D::new(dom_rect.width(), dom_rect.height()),
+    )
+}
+
+impl HasVisibleData for Synthetic<IntersectionObserverEntry> {
+    /// Get the bounds rectangle of the target element
+    fn get_bounding_client_rect(&self) -> VisibleResult<PixelsRect> {
+        Ok(dom_rect_ro_to_pixel_rect(
+            &self.event.bounding_client_rect(),
+        ))
+    }
+
+    /// Get the ratio of the intersectionRect to the boundingClientRect
+    fn get_intersection_ratio(&self) -> VisibleResult<f64> {
+        Ok(self.event.intersection_ratio())
+    }
+
+    /// Get the rect representing the target's visible area
+    fn get_intersection_rect(&self) -> VisibleResult<PixelsRect> {
+        Ok(dom_rect_ro_to_pixel_rect(&self.event.intersection_rect()))
+    }
+
+    /// Get if the target element intersects with the intersection observer's root
+    fn is_intersecting(&self) -> VisibleResult<bool> {
+        Ok(self.event.is_intersecting())
+    }
+
+    /// Get the rect for the intersection observer's root
+    fn get_root_bounds(&self) -> VisibleResult<PixelsRect> {
+        match self.event.root_bounds() {
+            Some(root_bounds) => Ok(dom_rect_ro_to_pixel_rect(&root_bounds)),
+            None => Err(VisibleError::NotSupported),
+        }
+    }
+
+    /// Get a timestamp indicating the time at which the intersection was recorded
+    fn get_time(&self) -> VisibleResult<SystemTime> {
+        let ms_since_epoch = self.event.time();
+        let rounded = ms_since_epoch.round() as u64;
+        let duration = std::time::Duration::from_millis(rounded);
+        Ok(SystemTime::UNIX_EPOCH + duration)
+    }
+
+    fn as_any(&self) -> &dyn std::any::Any {
+        self
+    }
+}
+
+impl WebEventExt for VisibleData {
+    type WebEvent = IntersectionObserverEntry;
+
+    #[inline(always)]
+    fn try_as_web_event(&self) -> Option<IntersectionObserverEntry> {
+        self.downcast::<CustomEvent>()
+            .and_then(|e| e.detail().dyn_into::<IntersectionObserverEntry>().ok())
+    }
+}