wip: overhaul event system

packages/html/src/events/form.rs

@@ -0,0 +1,44 @@
+use std::{collections::HashMap, sync::Arc};
+
+/* DOMEvent:  Send + SyncTarget relatedTarget */
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
+#[derive(Clone)]
+pub struct FormEvent {
+    pub value: String,
+
+    pub values: HashMap<String, String>,
+
+    #[cfg_attr(feature = "serialize", serde(skip))]
+    pub files: Option<Arc<dyn FileEngine>>,
+}
+
+#[async_trait::async_trait(?Send)]
+pub trait FileEngine {
+    // get a list of file names
+    fn files(&self) -> Vec<String>;
+
+    // read a file to bytes
+    async fn read_file(&self, file: &str) -> Option<Vec<u8>>;
+
+    // read a file to string
+    async fn read_file_to_string(&self, file: &str) -> Option<String>;
+}
+
+impl_event! {
+    FormEvent;
+
+    /// onchange
+    onchange
+
+    /// oninput handler
+    oninput
+
+    /// oninvalid
+    oninvalid
+
+    /// onreset
+    onreset
+
+    /// onsubmit
+    onsubmit
+}