script/dom/html/input_element/
text_value_widget.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5use std::cell::Ref;
6
7use js::context::JSContext;
8use script_bindings::codegen::GenericBindings::CharacterDataBinding::CharacterDataMethods;
9use script_bindings::root::Dom;
10
11use crate::dom::bindings::cell::DomRefCell;
12use crate::dom::bindings::inheritance::Castable;
13use crate::dom::characterdata::CharacterData;
14use crate::dom::element::Element;
15use crate::dom::htmlinputelement::HTMLInputElement;
16use crate::dom::node::{Node, NodeTraits};
17use crate::dom::text::Text;
18
19#[derive(Default, JSTraceable, MallocSizeOf, PartialEq)]
20#[cfg_attr(crown, crown::unrooted_must_root_lint::must_root)]
21pub(crate) struct TextValueWidget {
22    shadow_tree: DomRefCell<Option<TextValueShadowTree>>,
23}
24
25impl TextValueWidget {
26    /// Get the shadow tree for this [`HTMLInputElement`], if it is created and valid, otherwise
27    /// recreate the shadow tree and return it.
28    fn get_or_create_shadow_tree(
29        &self,
30        cx: &mut JSContext,
31        input: &HTMLInputElement,
32    ) -> Ref<'_, TextValueShadowTree> {
33        {
34            if let Ok(shadow_tree) = Ref::filter_map(self.shadow_tree.borrow(), |shadow_tree| {
35                shadow_tree.as_ref()
36            }) {
37                return shadow_tree;
38            }
39        }
40
41        let element = input.upcast::<Element>();
42        let shadow_root = element
43            .shadow_root()
44            .unwrap_or_else(|| element.attach_ua_shadow_root(cx, true));
45        let shadow_root = shadow_root.upcast();
46        *self.shadow_tree.borrow_mut() = Some(TextValueShadowTree::new(cx, shadow_root));
47        self.get_or_create_shadow_tree(cx, input)
48    }
49
50    pub(crate) fn update_shadow_tree(&self, cx: &mut JSContext, input: &HTMLInputElement) {
51        self.get_or_create_shadow_tree(cx, input).update(input)
52    }
53}
54
55#[derive(Clone, JSTraceable, MallocSizeOf, PartialEq)]
56#[cfg_attr(crown, crown::unrooted_must_root_lint::must_root)]
57struct TextValueShadowTree {
58    value: Dom<Text>,
59}
60
61impl TextValueShadowTree {
62    fn new(cx: &mut JSContext, shadow_root: &Node) -> Self {
63        let value = Text::new(cx, Default::default(), &shadow_root.owner_document());
64        Node::replace_all(cx, Some(value.upcast()), shadow_root);
65        Self {
66            value: value.as_traced(),
67        }
68    }
69
70    fn update(&self, input_element: &HTMLInputElement) {
71        let character_data = self.value.upcast::<CharacterData>();
72        let value = input_element.value_for_shadow_dom();
73        if character_data.Data() != value {
74            character_data.SetData(value);
75        }
76    }
77}
script/dom/html/input_element/text_value_widget.rs

script/dom/html/input_element/
text_value_widget.rs
