Cargoify servo

components/script/dom/htmlimageelement.rs

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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::attr::AttrValue;
+use dom::bindings::codegen::Bindings::HTMLImageElementBinding;
+use dom::bindings::codegen::Bindings::HTMLImageElementBinding::HTMLImageElementMethods;
+use dom::bindings::codegen::InheritTypes::{NodeCast, ElementCast, HTMLElementCast, HTMLImageElementDerived};
+use dom::bindings::js::{JS, JSRef, Temporary};
+use dom::bindings::trace::Untraceable;
+use dom::bindings::utils::{Reflectable, Reflector};
+use dom::document::Document;
+use dom::element::{Element, HTMLImageElementTypeId};
+use dom::element::AttributeHandlers;
+use dom::eventtarget::{EventTarget, NodeTargetTypeId};
+use dom::htmlelement::HTMLElement;
+use dom::node::{Node, ElementNodeTypeId, NodeHelpers, window_from_node};
+use dom::virtualmethods::VirtualMethods;
+use servo_net::image_cache_task;
+use servo_util::atom::Atom;
+use servo_util::geometry::to_px;
+use servo_util::str::DOMString;
+
+use url::{Url, UrlParser};
+
+use std::cell::RefCell;
+
+#[deriving(Encodable)]
+pub struct HTMLImageElement {
+    pub htmlelement: HTMLElement,
+    image: Untraceable<RefCell<Option<Url>>>,
+}
+
+impl HTMLImageElementDerived for EventTarget {
+    fn is_htmlimageelement(&self) -> bool {
+        self.type_id == NodeTargetTypeId(ElementNodeTypeId(HTMLImageElementTypeId))
+    }
+}
+
+trait PrivateHTMLImageElementHelpers {
+    fn update_image(&self, value: Option<(DOMString, &Url)>);
+}
+
+impl<'a> PrivateHTMLImageElementHelpers for JSRef<'a, HTMLImageElement> {
+    /// Makes the local `image` member match the status of the `src` attribute and starts
+    /// prefetching the image. This method must be called after `src` is changed.
+    fn update_image(&self, value: Option<(DOMString, &Url)>) {
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
+        let document = node.owner_doc().root();
+        let window = document.deref().window.root();
+        let image_cache = &window.image_cache_task;
+        match value {
+            None => {
+                *self.image.deref().borrow_mut() = None;
+            }
+            Some((src, base_url)) => {
+                let img_url = UrlParser::new().base_url(base_url).parse(src.as_slice());
+                // FIXME: handle URL parse errors more gracefully.
+                let img_url = img_url.unwrap();
+                *self.image.deref().borrow_mut() = Some(img_url.clone());
+
+                // inform the image cache to load this, but don't store a
+                // handle.
+                //
+                // TODO (Issue #84): don't prefetch if we are within a
+                // <noscript> tag.
+                image_cache.send(image_cache_task::Prefetch(img_url));
+            }
+        }
+    }
+}
+
+impl HTMLImageElement {
+    pub fn new_inherited(localName: DOMString, document: &JSRef<Document>) -> HTMLImageElement {
+        HTMLImageElement {
+            htmlelement: HTMLElement::new_inherited(HTMLImageElementTypeId, localName, document),
+            image: Untraceable::new(RefCell::new(None)),
+        }
+    }
+
+    pub fn new(localName: DOMString, document: &JSRef<Document>) -> Temporary<HTMLImageElement> {
+        let element = HTMLImageElement::new_inherited(localName, document);
+        Node::reflect_node(box element, document, HTMLImageElementBinding::Wrap)
+    }
+}
+
+pub trait LayoutHTMLImageElementHelpers {
+    unsafe fn image(&self) -> Option<Url>;
+}
+
+impl LayoutHTMLImageElementHelpers for JS<HTMLImageElement> {
+    unsafe fn image(&self) -> Option<Url> {
+        (*self.unsafe_get()).image.borrow().clone()
+    }
+}
+
+impl<'a> HTMLImageElementMethods for JSRef<'a, HTMLImageElement> {
+    make_getter!(Alt)
+
+    fn SetAlt(&self, alt: DOMString) {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
+        element.set_string_attribute("alt", alt)
+    }
+
+    make_getter!(Src)
+
+    fn SetSrc(&self, src: DOMString) {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
+        element.set_url_attribute("src", src)
+    }
+
+    make_getter!(UseMap)
+
+    fn SetUseMap(&self, use_map: DOMString) {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
+        element.set_string_attribute("usemap", use_map)
+    }
+
+    make_bool_getter!(IsMap)
+
+    fn SetIsMap(&self, is_map: bool) {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
+        element.set_string_attribute("ismap", is_map.to_string())
+    }
+
+    fn Width(&self) -> u32 {
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
+        let rect = node.get_bounding_content_box();
+        to_px(rect.size.width) as u32
+    }
+
+    fn SetWidth(&self, width: u32) {
+        let elem: &JSRef<Element> = ElementCast::from_ref(self);
+        elem.set_uint_attribute("width", width)
+    }
+
+    fn Height(&self) -> u32 {
+        let node: &JSRef<Node> = NodeCast::from_ref(self);
+        let rect = node.get_bounding_content_box();
+        to_px(rect.size.height) as u32
+    }
+
+    fn SetHeight(&self, height: u32) {
+        let elem: &JSRef<Element> = ElementCast::from_ref(self);
+        elem.set_uint_attribute("height", height)
+    }
+
+    make_getter!(Name)
+
+    fn SetName(&self, name: DOMString) {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
+        element.set_string_attribute("name", name)
+    }
+
+    make_getter!(Align)
+
+    fn SetAlign(&self, align: DOMString) {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
+        element.set_string_attribute("align", align)
+    }
+
+    make_uint_getter!(Hspace)
+
+    fn SetHspace(&self, hspace: u32) {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
+        element.set_uint_attribute("hspace", hspace)
+    }
+
+    make_uint_getter!(Vspace)
+
+    fn SetVspace(&self, vspace: u32) {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
+        element.set_uint_attribute("vspace", vspace)
+    }
+
+    make_getter!(LongDesc)
+
+    fn SetLongDesc(&self, longdesc: DOMString) {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
+        element.set_string_attribute("longdesc", longdesc)
+    }
+
+    make_getter!(Border)
+
+    fn SetBorder(&self, border: DOMString) {
+        let element: &JSRef<Element> = ElementCast::from_ref(self);
+        element.set_string_attribute("border", border)
+    }
+}
+
+impl<'a> VirtualMethods for JSRef<'a, HTMLImageElement> {
+    fn super_type<'a>(&'a self) -> Option<&'a VirtualMethods> {
+        let htmlelement: &JSRef<HTMLElement> = HTMLElementCast::from_ref(self);
+        Some(htmlelement as &VirtualMethods)
+    }
+
+    fn after_set_attr(&self, name: &Atom, value: DOMString) {
+        match self.super_type() {
+            Some(ref s) => s.after_set_attr(name, value.clone()),
+            _ => (),
+        }
+
+        if "src" == name.as_slice() {
+            let window = window_from_node(self).root();
+            let url = window.deref().get_url();
+            self.update_image(Some((value, &url)));
+        }
+    }
+
+    fn before_remove_attr(&self, name: &Atom, value: DOMString) {
+        match self.super_type() {
+            Some(ref s) => s.before_remove_attr(name, value.clone()),
+            _ => (),
+        }
+
+        if "src" == name.as_slice() {
+            self.update_image(None);
+        }
+    }
+
+    fn parse_plain_attribute(&self, name: &str, value: DOMString) -> AttrValue {
+        match name {
+            "width" | "height" | "hspace" | "vspace" => AttrValue::from_u32(value, 0),
+            _ => self.super_type().unwrap().parse_plain_attribute(name, value),
+        }
+    }
+}
+
+impl Reflectable for HTMLImageElement {
+    fn reflector<'a>(&'a self) -> &'a Reflector {
+        self.htmlelement.reflector()
+    }
+}