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use crate::OutputType;
use htmlescape::encode_attribute;
use std::fmt::{Display, Error, Formatter};
pub trait EventHandler<T: OutputType, E> {
fn attach(&mut self, target: &mut T::EventTarget) -> T::EventListenerHandle;
fn render(&self) -> Option<String>;
}
pub trait IntoEventHandler<T: OutputType, E> {
fn into_event_handler(self) -> Box<dyn EventHandler<T, E>>;
}
pub enum StringEvent {}
impl EventHandler<String, StringEvent> for &'static str {
fn attach(&mut self, _target: &mut <String as OutputType>::EventTarget) {
panic!("Silly wabbit, strings as event handlers are only for printing.");
}
fn render(&self) -> Option<String> {
Some(self.to_string())
}
}
impl IntoEventHandler<String, StringEvent> for &'static str {
fn into_event_handler(self) -> Box<dyn EventHandler<String, StringEvent>> {
Box::new(self)
}
}
impl EventHandler<String, StringEvent> for String {
fn attach(&mut self, _target: &mut <String as OutputType>::EventTarget) {
panic!("Silly wabbit, strings as event handlers are only for printing.");
}
fn render(&self) -> Option<String> {
Some(self.clone())
}
}
impl IntoEventHandler<String, StringEvent> for String {
fn into_event_handler(self) -> Box<dyn EventHandler<String, StringEvent>> {
Box::new(self)
}
}
macro_rules! declare_string_events {
($($name:ident,)*) => {
pub struct StringEvents {
$(
pub $name: Option<Box<dyn EventHandler<String, StringEvent>>>,
)*
}
impl Default for StringEvents {
fn default() -> Self {
StringEvents {
$(
$name: None,
)*
}
}
}
impl Display for StringEvents {
fn fmt(&self, f: &mut Formatter) -> Result<(), Error> {
$(
if let Some(ref value) = self.$name {
write!(f, " on{}=\"{}\"", stringify!($name),
encode_attribute(value.render().unwrap().as_str()))?;
}
)*
Ok(())
}
}
}
}
declare_string_events! {
abort,
autocomplete,
autocompleteerror,
blur,
cancel,
canplay,
canplaythrough,
change,
click,
close,
contextmenu,
cuechange,
dblclick,
drag,
dragend,
dragenter,
dragexit,
dragleave,
dragover,
dragstart,
drop,
durationchange,
emptied,
ended,
error,
focus,
input,
invalid,
keydown,
keypress,
keyup,
load,
loadeddata,
loadedmetadata,
loadstart,
mousedown,
mouseenter,
mouseleave,
mousemove,
mouseout,
mouseover,
mouseup,
mousewheel,
pause,
play,
playing,
progress,
ratechange,
reset,
resize,
scroll,
seeked,
seeking,
select,
show,
sort,
stalled,
submit,
suspend,
timeupdate,
toggle,
volumechange,
waiting,
}