servo/components/script/dom/html/htmlbodyelement.rs

/* 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 https://mozilla.org/MPL/2.0/. */

use dom_struct::dom_struct;
use embedder_traits::{EmbedderMsg, LoadStatus};
use html5ever::{LocalName, Prefix, local_name, ns};
use js::context::JSContext;
use js::rust::HandleObject;
use style::attr::AttrValue;
use style::color::AbsoluteColor;

use crate::dom::attr::Attr;
use crate::dom::bindings::codegen::Bindings::HTMLBodyElementBinding::HTMLBodyElementMethods;
use crate::dom::bindings::codegen::Bindings::WindowBinding::WindowMethods;
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::root::{DomRoot, LayoutDom};
use crate::dom::bindings::str::DOMString;
use crate::dom::document::Document;
use crate::dom::element::{AttributeMutation, Element};
use crate::dom::eventtarget::EventTarget;
use crate::dom::html::htmlelement::HTMLElement;
use crate::dom::node::{BindContext, Node, NodeTraits};
use crate::dom::virtualmethods::VirtualMethods;
use crate::script_runtime::CanGc;

#[dom_struct]
pub(crate) struct HTMLBodyElement {
    htmlelement: HTMLElement,
}

impl HTMLBodyElement {
    fn new_inherited(
        local_name: LocalName,
        prefix: Option<Prefix>,
        document: &Document,
    ) -> HTMLBodyElement {
        HTMLBodyElement {
            htmlelement: HTMLElement::new_inherited(local_name, prefix, document),
        }
    }

    pub(crate) fn new(
        cx: &mut js::context::JSContext,
        local_name: LocalName,
        prefix: Option<Prefix>,
        document: &Document,
        proto: Option<HandleObject>,
    ) -> DomRoot<HTMLBodyElement> {
        Node::reflect_node_with_proto(
            cx,
            Box::new(HTMLBodyElement::new_inherited(local_name, prefix, document)),
            document,
            proto,
        )
    }
}

impl HTMLBodyElementMethods<crate::DomTypeHolder> for HTMLBodyElement {
    // https://html.spec.whatwg.org/multipage/#dom-body-bgcolor
    make_getter!(BgColor, "bgcolor");

    // https://html.spec.whatwg.org/multipage/#dom-body-bgcolor
    make_legacy_color_setter!(SetBgColor, "bgcolor");

    // https://html.spec.whatwg.org/multipage/#dom-body-text
    make_getter!(Text, "text");

    // https://html.spec.whatwg.org/multipage/#dom-body-text
    make_legacy_color_setter!(SetText, "text");

    // https://html.spec.whatwg.org/multipage/#dom-body-background
    make_getter!(Background, "background");

    /// <https://html.spec.whatwg.org/multipage/#dom-body-background>
    fn SetBackground(&self, input: DOMString, can_gc: CanGc) {
        let value =
            AttrValue::from_resolved_url(&self.owner_document().base_url().get_arc(), input.into());
        self.upcast::<Element>()
            .set_attribute(&local_name!("background"), value, can_gc);
    }

    // https://html.spec.whatwg.org/multipage/#windoweventhandlers
    window_event_handlers!(ForwardToWindow);
}

impl LayoutDom<'_, HTMLBodyElement> {
    pub(crate) fn get_background_color(self) -> Option<AbsoluteColor> {
        self.upcast::<Element>()
            .get_attr_for_layout(&ns!(), &local_name!("bgcolor"))
            .and_then(AttrValue::as_color)
            .cloned()
    }

    pub(crate) fn get_color(self) -> Option<AbsoluteColor> {
        self.upcast::<Element>()
            .get_attr_for_layout(&ns!(), &local_name!("text"))
            .and_then(AttrValue::as_color)
            .cloned()
    }
}

impl VirtualMethods for HTMLBodyElement {
    fn super_type(&self) -> Option<&dyn VirtualMethods> {
        Some(self.upcast::<HTMLElement>() as &dyn VirtualMethods)
    }

    fn attribute_affects_presentational_hints(&self, attr: &Attr) -> bool {
        if attr.local_name() == &local_name!("bgcolor") {
            return true;
        }

        self.super_type()
            .unwrap()
            .attribute_affects_presentational_hints(attr)
    }

    fn bind_to_tree(&self, cx: &mut JSContext, context: &BindContext) {
        if let Some(s) = self.super_type() {
            s.bind_to_tree(cx, context);
        }

        if !context.tree_is_in_a_document_tree {
            return;
        }

        let window = self.owner_window();
        window.prevent_layout_until_load_event();
        if window.is_top_level() {
            window.send_to_embedder(EmbedderMsg::NotifyLoadStatusChanged(
                window.webview_id(),
                LoadStatus::HeadParsed,
            ));
        }
    }

    fn parse_plain_attribute(&self, name: &LocalName, value: DOMString) -> AttrValue {
        match *name {
            local_name!("bgcolor") | local_name!("text") => {
                AttrValue::from_legacy_color(value.into())
            },
            _ => self
                .super_type()
                .unwrap()
                .parse_plain_attribute(name, value),
        }
    }

    fn attribute_mutated(
        &self,
        cx: &mut js::context::JSContext,
        attr: &Attr,
        mutation: AttributeMutation,
    ) {
        let do_super_mutate = match (attr.local_name(), mutation) {
            (name, AttributeMutation::Set(..)) if name.starts_with("on") => {
                let document = self.owner_document();
                // https://html.spec.whatwg.org/multipage/
                // #event-handlers-on-elements,-document-objects,-and-window-objects:event-handlers-6
                match name {
                    &local_name!("onafterprint") |
                    &local_name!("onbeforeprint") |
                    &local_name!("onbeforeunload") |
                    &local_name!("onerror") |
                    &local_name!("onfocus") |
                    &local_name!("onhashchange") |
                    &local_name!("onload") |
                    &local_name!("onlanguagechange") |
                    &local_name!("onmessage") |
                    &local_name!("onmessageerror") |
                    &local_name!("onoffline") |
                    &local_name!("ononline") |
                    &local_name!("onpagehide") |
                    &local_name!("onpagereveal") |
                    &local_name!("onpageshow") |
                    &local_name!("onpageswap") |
                    &local_name!("onpopstate") |
                    &local_name!("onrejectionhandled") |
                    &local_name!("onresize") |
                    &local_name!("onscroll") |
                    &local_name!("onstorage") |
                    &local_name!("onunhandledrejection") |
                    &local_name!("onunload") => {
                        if document.has_browsing_context() {
                            // https://html.spec.whatwg.org/multipage/webappapis.html
                            // #event-handler-attributes%3Aevent-handler-content-attributes-3
                            // This matches the `has_browsing_context()` check done by the
                            // `window_event_handlers!(ForwardToWindow)` macro for WebIDL attributes.
                            let window = document.window();
                            let source = &**attr.value();
                            let evtarget = window.upcast::<EventTarget>(); // forwarded event
                            let source_line = 1; // TODO(#9604) obtain current JS execution line
                            evtarget.set_event_handler_uncompiled(
                                window.get_url(),
                                source_line,
                                &name[2..],
                                source,
                            );
                        }
                        false
                    },
                    _ => true, // HTMLElement::attribute_mutated will take care of this.
                }
            },
            _ => true,
        };

        if do_super_mutate {
            self.super_type()
                .unwrap()
                .attribute_mutated(cx, attr, mutation);
        }
    }
}