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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 canvas::canvas_paint_task::CanvasMsg;
use dom::attr::Attr;
use dom::attr::AttrHelpers;
use dom::bindings::codegen::Bindings::HTMLCanvasElementBinding;
use dom::bindings::codegen::Bindings::HTMLCanvasElementBinding::HTMLCanvasElementMethods;
use dom::bindings::codegen::InheritTypes::HTMLCanvasElementDerived;
use dom::bindings::codegen::InheritTypes::{ElementCast, HTMLElementCast};
use dom::bindings::global::GlobalRef;
use dom::bindings::js::{MutNullableJS, JSRef, LayoutJS, Temporary};
use dom::canvasrenderingcontext2d::{CanvasRenderingContext2D, LayoutCanvasRenderingContext2DHelpers};
use dom::document::Document;
use dom::element::{Element, AttributeHandlers};
use dom::eventtarget::{EventTarget, EventTargetTypeId};
use dom::element::ElementTypeId;
use dom::htmlelement::{HTMLElement, HTMLElementTypeId};
use dom::node::{Node, NodeTypeId, window_from_node};
use dom::virtualmethods::VirtualMethods;
use util::str::{DOMString, parse_unsigned_integer};
use geom::size::Size2D;
use std::cell::Cell;
use std::default::Default;
use std::sync::mpsc::Sender;
const DEFAULT_WIDTH: u32 = 300;
const DEFAULT_HEIGHT: u32 = 150;
#[dom_struct]
pub struct HTMLCanvasElement {
htmlelement: HTMLElement,
context: MutNullableJS<CanvasRenderingContext2D>,
width: Cell<u32>,
height: Cell<u32>,
}
impl HTMLCanvasElementDerived for EventTarget {
fn is_htmlcanvaselement(&self) -> bool {
*self.type_id() == EventTargetTypeId::Node(NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLCanvasElement)))
}
}
impl HTMLCanvasElement {
fn new_inherited(localName: DOMString, prefix: Option<DOMString>, document: JSRef<Document>) -> HTMLCanvasElement {
HTMLCanvasElement {
htmlelement: HTMLElement::new_inherited(HTMLElementTypeId::HTMLCanvasElement, localName, prefix, document),
context: Default::default(),
width: Cell::new(DEFAULT_WIDTH),
height: Cell::new(DEFAULT_HEIGHT),
}
}
#[allow(unrooted_must_root)]
pub fn new(localName: DOMString, prefix: Option<DOMString>, document: JSRef<Document>) -> Temporary<HTMLCanvasElement> {
let element = HTMLCanvasElement::new_inherited(localName, prefix, document);
Node::reflect_node(box element, document, HTMLCanvasElementBinding::Wrap)
}
}
pub trait LayoutHTMLCanvasElementHelpers {
#[allow(unsafe_code)]
unsafe fn get_renderer(&self) -> Option<Sender<CanvasMsg>>;
#[allow(unsafe_code)]
unsafe fn get_canvas_width(&self) -> u32;
#[allow(unsafe_code)]
unsafe fn get_canvas_height(&self) -> u32;
}
impl LayoutHTMLCanvasElementHelpers for LayoutJS<HTMLCanvasElement> {
#[allow(unsafe_code)]
unsafe fn get_renderer(&self) -> Option<Sender<CanvasMsg>> {
let context = (*self.unsafe_get()).context.get_inner_as_layout();
context.map(|cx| cx.get_renderer())
}
#[allow(unsafe_code)]
unsafe fn get_canvas_width(&self) -> u32 {
(*self.unsafe_get()).width.get()
}
#[allow(unsafe_code)]
unsafe fn get_canvas_height(&self) -> u32 {
(*self.unsafe_get()).height.get()
}
}
pub trait HTMLCanvasElementHelpers {
fn get_size(&self) -> Size2D<i32>;
fn get_2d_context(self) -> Temporary<CanvasRenderingContext2D>;
fn is_valid(self) -> bool;
}
impl<'a> HTMLCanvasElementHelpers for JSRef<'a, HTMLCanvasElement> {
fn get_size(&self) -> Size2D<i32> {
Size2D(self.Width() as i32, self.Height() as i32)
}
fn get_2d_context(self) -> Temporary<CanvasRenderingContext2D> {
self.GetContext(String::from_str("2d")).unwrap()
}
fn is_valid(self) -> bool {
self.height.get() != 0 && self.width.get() != 0
}
}
impl<'a> HTMLCanvasElementMethods for JSRef<'a, HTMLCanvasElement> {
fn Width(self) -> u32 {
self.width.get()
}
fn SetWidth(self, width: u32) {
let elem: JSRef<Element> = ElementCast::from_ref(self);
elem.set_uint_attribute(&atom!("width"), width)
}
fn Height(self) -> u32 {
self.height.get()
}
fn SetHeight(self, height: u32) {
let elem: JSRef<Element> = ElementCast::from_ref(self);
elem.set_uint_attribute(&atom!("height"), height)
}
fn GetContext(self, id: DOMString) -> Option<Temporary<CanvasRenderingContext2D>> {
if id.as_slice() != "2d" {
return None;
}
Some(self.context.or_init(|| {
let window = window_from_node(self).root();
let (w, h) = (self.width.get() as i32, self.height.get() as i32);
CanvasRenderingContext2D::new(GlobalRef::Window(window.r()), self, Size2D(w, h))
}))
}
}
impl<'a> VirtualMethods for JSRef<'a, HTMLCanvasElement> {
fn super_type<'b>(&'b self) -> Option<&'b VirtualMethods> {
let element: &JSRef<HTMLElement> = HTMLElementCast::from_borrowed_ref(self);
Some(element as &VirtualMethods)
}
fn before_remove_attr(&self, attr: JSRef<Attr>) {
if let Some(ref s) = self.super_type() {
s.before_remove_attr(attr);
}
let recreate = match attr.local_name() {
&atom!("width") => {
self.width.set(DEFAULT_WIDTH);
true
}
&atom!("height") => {
self.height.set(DEFAULT_HEIGHT);
true
}
_ => false,
};
if recreate {
let (w, h) = (self.width.get() as i32, self.height.get() as i32);
match self.context.get() {
Some(context) => context.root().r().recreate(Size2D(w, h)),
None => ()
}
}
}
fn after_set_attr(&self, attr: JSRef<Attr>) {
if let Some(ref s) = self.super_type() {
s.after_set_attr(attr);
}
let value = attr.value();
let recreate = match attr.local_name() {
&atom!("width") => {
self.width.set(parse_unsigned_integer(value.as_slice().chars()).unwrap_or(DEFAULT_WIDTH));
true
}
&atom!("height") => {
self.height.set(parse_unsigned_integer(value.as_slice().chars()).unwrap_or(DEFAULT_HEIGHT));
true
}
_ => false,
};
if recreate {
let (w, h) = (self.width.get() as i32, self.height.get() as i32);
match self.context.get() {
Some(context) => context.root().r().recreate(Size2D(w, h)),
None => ()
}
}
}
}
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