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Implement getComputedStyle

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This commit is contained in:
David Zbarsky 2015-07-27 23:05:18 -04:00
parent 416931f4be
commit e484d6b5e3
24 changed files with 886 additions and 152 deletions
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22
components/script/dom/cssstyledeclaration.rs
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@ -11,9 +11,10 @@ use dom::bindings::utils::{Reflector, reflect_dom_object};
use dom::document::DocumentHelpers;
use dom::element::{ElementHelpers, StylePriority};
use dom::htmlelement::HTMLElement;
use dom::node::{window_from_node, document_from_node, NodeDamage};
use dom::node::{window_from_node, document_from_node, NodeDamage, NodeHelpers};
use dom::window::{Window, WindowHelpers};
use util::str::DOMString;
use selectors::parser::PseudoElement;
use string_cache::Atom;
use style::properties::{is_supported_property, longhands_from_shorthand, parse_style_attribute};
use style::properties::PropertyDeclaration;
@ -27,6 +28,7 @@ pub struct CSSStyleDeclaration {
reflector_: Reflector,
owner: JS<HTMLElement>,
readonly: bool,
pseudo: Option<PseudoElement>,
}
#[derive(PartialEq)]
@ -56,17 +58,20 @@ fn serialize_list(list: &Vec<PropertyDeclaration>) -> DOMString {
impl CSSStyleDeclaration {
pub fn new_inherited(owner: &HTMLElement,
pseudo: Option<PseudoElement>,
modification_access: CSSModificationAccess) -> CSSStyleDeclaration {
CSSStyleDeclaration {
reflector_: Reflector::new(),
owner: JS::from_ref(owner),
pseudo: pseudo,
readonly: modification_access == CSSModificationAccess::Readonly,
}
}
pub fn new(global: &Window, owner: &HTMLElement,
pseudo: Option<PseudoElement>,
modification_access: CSSModificationAccess) -> Root<CSSStyleDeclaration> {
reflect_dom_object(box CSSStyleDeclaration::new_inherited(owner, modification_access),
reflect_dom_object(box CSSStyleDeclaration::new_inherited(owner, pseudo, modification_access),
GlobalRef::Window(global),
CSSStyleDeclarationBinding::Wrap)
}
@ -75,6 +80,7 @@ impl CSSStyleDeclaration {
trait PrivateCSSStyleDeclarationHelpers {
fn get_declaration(self, property: &Atom) -> Option<PropertyDeclaration>;
fn get_important_declaration(self, property: &Atom) -> Option<PropertyDeclaration>;
fn get_computed_style(self, property: &Atom) -> Option<DOMString>;
}
impl<'a> PrivateCSSStyleDeclarationHelpers for &'a CSSStyleDeclaration {
@ -89,6 +95,13 @@ impl<'a> PrivateCSSStyleDeclarationHelpers for &'a CSSStyleDeclaration {
let element = ElementCast::from_ref(owner.r());
element.get_important_inline_style_declaration(property).map(|decl| decl.clone())
}
fn get_computed_style(self, property: &Atom) -> Option<DOMString> {
let owner = self.owner.root();
let node = NodeCast::from_ref(owner.r());
let addr = node.to_trusted_node_address();
window_from_node(owner.r()).resolved_style_query(addr, self.pseudo.clone(), property)
}
}
impl<'a> CSSStyleDeclarationMethods for &'a CSSStyleDeclaration {
@ -129,6 +142,11 @@ impl<'a> CSSStyleDeclarationMethods for &'a CSSStyleDeclaration {
// Step 1
let property = Atom::from_slice(&property.to_ascii_lowercase());
if self.readonly {
// Readonly style declarations are used for getComputedStyle.
return self.get_computed_style(&property).unwrap_or("".to_owned());
}
// Step 2
let longhand_properties = longhands_from_shorthand(&property);
if let Some(longhand_properties) = longhand_properties {