trait based event system

packages/html/src/events/touch.rs

@@ -1,17 +1,139 @@
 use dioxus_core::Event;
 
 pub type TouchEvent = Event<TouchData>;
-#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
-#[derive(Debug, Clone, PartialEq, Eq)]
 pub struct TouchData {
-    pub alt_key: bool,
-    pub ctrl_key: bool,
-    pub meta_key: bool,
-    pub shift_key: bool,
-    // get_modifier_state: bool,
-    // changedTouches: DOMTouchList,
-    // targetTouches: DOMTouchList,
-    // touches: DOMTouchList,
+    inner: Box<dyn HasTouchData>,
+}
+
+impl<E: HasTouchData> From<E> for TouchData {
+    fn from(e: E) -> Self {
+        Self { inner: Box::new(e) }
+    }
+}
+
+impl std::fmt::Debug for TouchData {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("TouchData")
+            .field("alt_key", &self.alt_key())
+            .field("ctrl_key", &self.ctrl_key())
+            .field("meta_key", &self.meta_key())
+            .field("shift_key", &self.shift_key())
+            .finish()
+    }
+}
+
+impl PartialEq for TouchData {
+    fn eq(&self, other: &Self) -> bool {
+        self.alt_key() == other.alt_key()
+            && self.ctrl_key() == other.ctrl_key()
+            && self.meta_key() == other.meta_key()
+            && self.shift_key() == other.shift_key()
+    }
+}
+
+impl TouchData {
+    /// Returns true if the "ALT" key was down when the touch event was fired.
+    pub fn alt_key(&self) -> bool {
+        self.inner.alt_key()
+    }
+
+    /// Returns true if the "CTRL" key was down when the touch event was fired.
+    pub fn ctrl_key(&self) -> bool {
+        self.inner.ctrl_key()
+    }
+
+    /// Returns true if the "META" key was down when the touch event was fired.
+    pub fn meta_key(&self) -> bool {
+        self.inner.meta_key()
+    }
+
+    /// Returns true if the "SHIFT" key was down when the touch event was fired.
+    pub fn shift_key(&self) -> bool {
+        self.inner.shift_key()
+    }
+
+    /// Downcast this event to a concrete event type
+    pub fn downcast<T: 'static>(&self) -> Option<&T> {
+        self.inner.as_any().downcast_ref::<T>()
+    }
+}
+
+#[cfg(feature = "serialize")]
+#[derive(serde::Serialize, serde::Deserialize)]
+struct SerializedTouchData {
+    alt_key: bool,
+    ctrl_key: bool,
+    meta_key: bool,
+    shift_key: bool,
+}
+
+#[cfg(feature = "serialize")]
+impl From<&TouchData> for SerializedTouchData {
+    fn from(data: &TouchData) -> Self {
+        Self {
+            alt_key: data.alt_key(),
+            ctrl_key: data.ctrl_key(),
+            meta_key: data.meta_key(),
+            shift_key: data.shift_key(),
+        }
+    }
+}
+
+#[cfg(feature = "serialize")]
+impl HasTouchData for SerializedTouchData {
+    fn alt_key(&self) -> bool {
+        self.alt_key
+    }
+
+    fn ctrl_key(&self) -> bool {
+        self.ctrl_key
+    }
+
+    fn meta_key(&self) -> bool {
+        self.meta_key
+    }
+
+    fn shift_key(&self) -> bool {
+        self.shift_key
+    }
+
+    fn as_any(&self) -> &dyn std::any::Any {
+        self
+    }
+}
+
+#[cfg(feature = "serialize")]
+impl serde::Serialize for TouchData {
+    fn serialize<S: serde::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        SerializedTouchData::from(self).serialize(serializer)
+    }
+}
+
+#[cfg(feature = "serialize")]
+impl<'de> serde::Deserialize<'de> for TouchData {
+    fn deserialize<D: serde::Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
+        let data = SerializedTouchData::deserialize(deserializer)?;
+        Ok(Self {
+            inner: Box::new(data),
+        })
+    }
+}
+
+pub trait HasTouchData: std::any::Any {
+    /// Returns true if the "ALT" key was down when the touch event was fired.
+    fn alt_key(&self) -> bool;
+
+    /// Returns true if the "CTRL" key was down when the touch event was fired.
+    fn ctrl_key(&self) -> bool;
+
+    /// Returns true if the "META" key was down when the touch event was fired.
+    fn meta_key(&self) -> bool;
+
+    /// Returns true if the "SHIFT" key was down when the touch event was fired.
+    fn shift_key(&self) -> bool;
+
+    /// return self as Any
+    fn as_any(&self) -> &dyn std::any::Any;
 }
 
 impl_event! {