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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use dom::bindings::utils::{Reflectable, Reflector};
use dom::bindings::utils::{Fallible, InvalidState};
use dom::bindings::codegen::EventListenerBinding::EventListener;
use dom::document::AbstractDocument;
use dom::event::AbstractEvent;
use dom::eventdispatcher::dispatch_event;
use dom::node::AbstractNode;
use dom::window::Window;
use servo_util::str::DOMString;
use std::cast;
use std::hashmap::HashMap;
use std::unstable::raw::Box;
#[deriving(Eq)]
pub enum ListenerPhase {
Capturing,
Bubbling,
}
#[deriving(Eq)]
pub enum EventTargetTypeId {
WindowTypeId,
NodeTypeId
}
#[deriving(Eq)]
struct EventListenerEntry {
phase: ListenerPhase,
listener: EventListener
}
pub struct EventTarget {
type_id: EventTargetTypeId,
reflector_: Reflector,
handlers: HashMap<DOMString, ~[EventListenerEntry]>,
}
pub struct AbstractEventTarget {
eventtarget: *mut Box<EventTarget>
}
impl AbstractEventTarget {
pub fn from_box<T>(box_: *mut Box<T>) -> AbstractEventTarget {
AbstractEventTarget {
eventtarget: box_ as *mut Box<EventTarget>
}
}
pub fn from_node(node: AbstractNode) -> AbstractEventTarget {
unsafe {
cast::transmute(node)
}
}
pub fn from_window(window: @mut Window) -> AbstractEventTarget {
AbstractEventTarget {
eventtarget: unsafe { cast::transmute(window) }
}
}
pub fn from_document(document: AbstractDocument) -> AbstractEventTarget {
unsafe {
cast::transmute(document)
}
}
pub fn type_id(&self) -> EventTargetTypeId {
self.eventtarget().type_id
}
pub fn is_window(&self) -> bool {
self.type_id() == WindowTypeId
}
pub fn is_node(&self) -> bool {
self.type_id() == NodeTypeId
}
//
// Downcasting borrows
//
fn transmute<'a, T>(&'a self) -> &'a T {
unsafe {
let box_: *Box<T> = self.eventtarget as *Box<T>;
&(*box_).data
}
}
fn transmute_mut<'a, T>(&'a mut self) -> &'a mut T {
unsafe {
let box_: *mut Box<T> = self.eventtarget as *mut Box<T>;
&mut (*box_).data
}
}
pub fn eventtarget<'a>(&'a self) -> &'a EventTarget {
self.transmute()
}
pub fn mut_eventtarget<'a>(&'a mut self) -> &'a mut EventTarget {
self.transmute_mut()
}
}
impl Reflectable for AbstractEventTarget {
fn reflector<'a>(&'a self) -> &'a Reflector {
self.eventtarget().reflector()
}
fn mut_reflector<'a>(&'a mut self) -> &'a mut Reflector {
self.mut_eventtarget().mut_reflector()
}
}
impl EventTarget {
pub fn new_inherited(type_id: EventTargetTypeId) -> EventTarget {
EventTarget {
type_id: type_id,
reflector_: Reflector::new(),
handlers: HashMap::new(),
}
}
pub fn get_listeners(&self, type_: &str) -> Option<~[EventListener]> {
self.handlers.find_equiv(&type_).map(|listeners| {
listeners.iter().map(|entry| entry.listener).collect()
})
}
pub fn get_listeners_for(&self, type_: &str, desired_phase: ListenerPhase)
-> Option<~[EventListener]> {
self.handlers.find_equiv(&type_).map(|listeners| {
let filtered = listeners.iter().filter(|entry| entry.phase == desired_phase);
filtered.map(|entry| entry.listener).collect()
})
}
pub fn AddEventListener(&mut self,
ty: DOMString,
listener: Option<EventListener>,
capture: bool) {
for &listener in listener.iter() {
let entry = self.handlers.find_or_insert_with(ty.clone(), |_| ~[]);
let phase = if capture { Capturing } else { Bubbling };
let new_entry = EventListenerEntry {
phase: phase,
listener: listener
};
if entry.position_elem(&new_entry).is_none() {
entry.push(new_entry);
}
}
}
pub fn RemoveEventListener(&mut self,
ty: DOMString,
listener: Option<EventListener>,
capture: bool) {
for &listener in listener.iter() {
let mut entry = self.handlers.find_mut(&ty);
for entry in entry.mut_iter() {
let phase = if capture { Capturing } else { Bubbling };
let old_entry = EventListenerEntry {
phase: phase,
listener: listener
};
let position = entry.position_elem(&old_entry);
for &position in position.iter() {
entry.remove(position);
}
}
}
}
pub fn DispatchEvent(&self, abstract_self: AbstractEventTarget, event: AbstractEvent) -> Fallible<bool> {
self.dispatch_event_with_target(abstract_self, None, event)
}
pub fn dispatch_event_with_target(&self,
abstract_self: AbstractEventTarget,
abstract_target: Option<AbstractEventTarget>,
event: AbstractEvent) -> Fallible<bool> {
if event.event().dispatching || !event.event().initialized {
return Err(InvalidState);
}
Ok(dispatch_event(abstract_self, abstract_target, event))
}
}
impl Reflectable for EventTarget {
fn reflector<'a>(&'a self) -> &'a Reflector {
&self.reflector_
}
fn mut_reflector<'a>(&'a mut self) -> &'a mut Reflector {
&mut self.reflector_
}
}
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