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58e1bd0e57
This replaces before_remove_attr(), after_remove_attr() and after_set_attr(). The virtual method takes the mutated attribute and an AttributeMutation value to disambiguate between "attribute is changed", "attribute is added" and "attribute is removed". In the case of "attribute is changed", the mutation value contains a reference to the old value of the mutated attribute, which is used to unregister outdated named elements when the "id" attribute is changed on an element. This greatly simplifies the handling of attributes, which in many cases don't have any specific behaviour whether they are removed or changed or added. It also fixes a few bugs where things were put in before_remove_attr() instead of after_remove_attr() (e.g. when removing an href attribute from a base element). A few helper functions in Element were also renamed and made private.
94 lines
3.4 KiB
Rust
94 lines
3.4 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use dom::attr::Attr;
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use dom::bindings::codegen::Bindings::HTMLBaseElementBinding;
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use dom::bindings::codegen::InheritTypes::ElementCast;
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use dom::bindings::codegen::InheritTypes::HTMLBaseElementDerived;
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use dom::bindings::codegen::InheritTypes::HTMLElementCast;
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use dom::bindings::js::Root;
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use dom::document::Document;
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use dom::element::{AttributeMutation, ElementTypeId};
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use dom::eventtarget::{EventTarget, EventTargetTypeId};
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use dom::htmlelement::{HTMLElement, HTMLElementTypeId};
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use dom::node::{Node, NodeTypeId, document_from_node};
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use dom::virtualmethods::VirtualMethods;
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use util::str::DOMString;
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use url::{Url, UrlParser};
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#[dom_struct]
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pub struct HTMLBaseElement {
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htmlelement: HTMLElement
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}
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impl HTMLBaseElementDerived for EventTarget {
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fn is_htmlbaseelement(&self) -> bool {
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*self.type_id() ==
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EventTargetTypeId::Node(
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLBaseElement)))
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}
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}
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impl HTMLBaseElement {
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fn new_inherited(localName: DOMString, prefix: Option<DOMString>, document: &Document) -> HTMLBaseElement {
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HTMLBaseElement {
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htmlelement: HTMLElement::new_inherited(HTMLElementTypeId::HTMLBaseElement, localName, prefix, document)
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}
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}
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#[allow(unrooted_must_root)]
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pub fn new(localName: DOMString,
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prefix: Option<DOMString>,
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document: &Document) -> Root<HTMLBaseElement> {
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let element = HTMLBaseElement::new_inherited(localName, prefix, document);
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Node::reflect_node(box element, document, HTMLBaseElementBinding::Wrap)
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}
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/// https://html.spec.whatwg.org/multipage/#frozen-base-url
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pub fn frozen_base_url(&self) -> Url {
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let href = ElementCast::from_ref(self).get_attribute(&ns!(""), &atom!("href"))
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.expect("The frozen base url is only defined for base elements \
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that have a base url.");
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let base = document_from_node(self).fallback_base_url();
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let parsed = UrlParser::new().base_url(&base).parse(&href.value());
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parsed.unwrap_or(base)
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}
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/// Update the cached base element in response to binding or unbinding from
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/// a tree.
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pub fn bind_unbind(&self, tree_in_doc: bool) {
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if !tree_in_doc {
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return;
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}
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if ElementCast::from_ref(self).has_attribute(&atom!("href")) {
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let document = document_from_node(self);
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document.refresh_base_element();
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}
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}
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}
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impl VirtualMethods for HTMLBaseElement {
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fn super_type<'b>(&'b self) -> Option<&'b VirtualMethods> {
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Some(HTMLElementCast::from_ref(self) as &VirtualMethods)
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}
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fn attribute_mutated(&self, attr: &Attr, mutation: AttributeMutation) {
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self.super_type().unwrap().attribute_mutated(attr, mutation);
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if *attr.local_name() == atom!(href) {
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document_from_node(self).refresh_base_element();
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}
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}
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fn bind_to_tree(&self, tree_in_doc: bool) {
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self.super_type().unwrap().bind_to_tree(tree_in_doc);
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self.bind_unbind(tree_in_doc);
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}
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fn unbind_from_tree(&self, tree_in_doc: bool) {
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self.super_type().unwrap().unbind_from_tree(tree_in_doc);
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self.bind_unbind(tree_in_doc);
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}
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}
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