script/dom/html/
htmlprogresselement.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 dom_struct::dom_struct;
8use html5ever::{LocalName, Prefix, QualName, local_name, ns};
9use js::context::JSContext;
10use js::rust::HandleObject;
11use script_bindings::cell::DomRefCell;
12
13use crate::dom::bindings::codegen::Bindings::ElementBinding::Element_Binding::ElementMethods;
14use crate::dom::bindings::codegen::Bindings::HTMLProgressElementBinding::HTMLProgressElementMethods;
15use crate::dom::bindings::codegen::Bindings::NodeBinding::Node_Binding::NodeMethods;
16use crate::dom::bindings::inheritance::Castable;
17use crate::dom::bindings::num::Finite;
18use crate::dom::bindings::root::{Dom, DomRoot, MutNullableDom};
19use crate::dom::bindings::str::DOMString;
20use crate::dom::document::Document;
21use crate::dom::element::attributes::storage::AttrRef;
22use crate::dom::element::{AttributeMutation, CustomElementCreationMode, Element, ElementCreator};
23use crate::dom::html::htmlelement::HTMLElement;
24use crate::dom::node::virtualmethods::VirtualMethods;
25use crate::dom::node::{BindContext, Node, NodeTraits};
26use crate::dom::nodelist::NodeList;
27
28#[dom_struct]
29pub(crate) struct HTMLProgressElement {
30    htmlelement: HTMLElement,
31    labels_node_list: MutNullableDom<NodeList>,
32    shadow_tree: DomRefCell<Option<ShadowTree>>,
33}
34
35/// Holds handles to all slots in the UA shadow tree
36#[derive(Clone, JSTraceable, MallocSizeOf)]
37#[cfg_attr(crown, crown::unrooted_must_root_lint::must_root)]
38struct ShadowTree {
39    progress_bar: Dom<Element>,
40}
41
42impl HTMLProgressElement {
43    fn new_inherited(
44        local_name: LocalName,
45        prefix: Option<Prefix>,
46        document: &Document,
47    ) -> HTMLProgressElement {
48        HTMLProgressElement {
49            htmlelement: HTMLElement::new_inherited(local_name, prefix, document),
50            labels_node_list: MutNullableDom::new(None),
51            shadow_tree: Default::default(),
52        }
53    }
54
55    pub(crate) fn new(
56        cx: &mut js::context::JSContext,
57        local_name: LocalName,
58        prefix: Option<Prefix>,
59        document: &Document,
60        proto: Option<HandleObject>,
61    ) -> DomRoot<HTMLProgressElement> {
62        Node::reflect_node_with_proto(
63            cx,
64            Box::new(HTMLProgressElement::new_inherited(
65                local_name, prefix, document,
66            )),
67            document,
68            proto,
69        )
70    }
71
72    fn create_shadow_tree(&self, cx: &mut JSContext) {
73        let document = self.owner_document();
74        let root = self.upcast::<Element>().attach_ua_shadow_root(cx, true);
75
76        let progress_bar = Element::create(
77            cx,
78            QualName::new(None, ns!(html), local_name!("div")),
79            None,
80            &document,
81            ElementCreator::ScriptCreated,
82            CustomElementCreationMode::Asynchronous,
83            None,
84        );
85
86        // FIXME: This should use ::-moz-progress-bar
87        progress_bar.SetId(cx, "-servo-progress-bar".into());
88        root.upcast::<Node>()
89            .AppendChild(cx, progress_bar.upcast::<Node>())
90            .unwrap();
91
92        let _ = self.shadow_tree.borrow_mut().insert(ShadowTree {
93            progress_bar: progress_bar.as_traced(),
94        });
95        self.upcast::<Node>()
96            .dirty(crate::dom::node::NodeDamage::Other);
97    }
98
99    fn shadow_tree(&self, cx: &mut JSContext) -> Ref<'_, ShadowTree> {
100        if !self.upcast::<Element>().is_shadow_host() {
101            self.create_shadow_tree(cx);
102        }
103
104        Ref::filter_map(self.shadow_tree.borrow(), Option::as_ref)
105            .ok()
106            .expect("UA shadow tree was not created")
107    }
108
109    /// Update the visual width of bar
110    fn update_state(&self, cx: &mut JSContext) {
111        let shadow_tree = self.shadow_tree(cx);
112        let position = (*self.Value() / *self.Max()) * 100.0;
113        let style = format!("width: {}%", position);
114
115        shadow_tree
116            .progress_bar
117            .set_string_attribute(cx, &local_name!("style"), style.into());
118    }
119}
120
121impl HTMLProgressElementMethods<crate::DomTypeHolder> for HTMLProgressElement {
122    // https://html.spec.whatwg.org/multipage/#dom-lfe-labels
123    make_labels_getter!(Labels, labels_node_list);
124
125    /// <https://html.spec.whatwg.org/multipage/#dom-progress-value>
126    fn Value(&self) -> Finite<f64> {
127        // In case of missing `value`, parse error, or negative `value`, `value` should be
128        // interpreted as 0.  As `get_string_attribute` returns an empty string in case the
129        // attribute is missing, this case is handeled as the default of the `map_or` function.
130        //
131        // It is safe to wrap the number coming from `parse_floating_point_number` as it will
132        // return Err on inf and nan
133        self.upcast::<Element>()
134            .get_string_attribute(&local_name!("value"))
135            .parse_floating_point_number()
136            .map_or(Finite::wrap(0.0), |v| {
137                if v < 0.0 {
138                    Finite::wrap(0.0)
139                } else {
140                    Finite::wrap(v.min(*self.Max()))
141                }
142            })
143    }
144
145    /// <https://html.spec.whatwg.org/multipage/#dom-progress-value>
146    fn SetValue(&self, cx: &mut JSContext, new_val: Finite<f64>) {
147        if *new_val >= 0.0 {
148            let mut string_value = DOMString::from((*new_val).to_string());
149            string_value.set_best_representation_of_the_floating_point_number();
150            self.upcast::<Element>()
151                .set_string_attribute(cx, &local_name!("value"), string_value);
152        }
153    }
154
155    /// <https://html.spec.whatwg.org/multipage/#dom-progress-max>
156    fn Max(&self) -> Finite<f64> {
157        // In case of missing `max`, parse error, or negative `max`, `max` should be interpreted as
158        // 1.0. As `get_string_attribute` returns an empty string in case the attribute is missing,
159        // these cases are handeled by `map_or`
160        self.upcast::<Element>()
161            .get_string_attribute(&local_name!("max"))
162            .parse_floating_point_number()
163            .map_or(Finite::wrap(1.0), |m| {
164                if m <= 0.0 {
165                    Finite::wrap(1.0)
166                } else {
167                    Finite::wrap(m)
168                }
169            })
170    }
171
172    /// <https://html.spec.whatwg.org/multipage/#dom-progress-max>
173    fn SetMax(&self, cx: &mut JSContext, new_val: Finite<f64>) {
174        if *new_val > 0.0 {
175            let mut string_value = DOMString::from((*new_val).to_string());
176            string_value.set_best_representation_of_the_floating_point_number();
177            self.upcast::<Element>()
178                .set_string_attribute(cx, &local_name!("max"), string_value);
179        }
180    }
181
182    /// <https://html.spec.whatwg.org/multipage/#dom-progress-position>
183    fn Position(&self) -> Finite<f64> {
184        let value = self
185            .upcast::<Element>()
186            .get_string_attribute(&local_name!("value"));
187        if value.is_empty() {
188            Finite::wrap(-1.0)
189        } else {
190            let value = self.Value();
191            let max = self.Max();
192            // An unsafe Finite constructor might be nice here, as it's unlikely for the
193            // compiler to infer the following guarantees. It is probably premature
194            // optimization though.
195            //
196            // Safety: `ret` have to be a finite, defined number. This is the case since both
197            // value and max is finite, max > 0, and a value >> max cannot exist, as
198            // Self::Value(&self) enforces value <= max.
199            Finite::wrap(*value / *max)
200        }
201    }
202}
203
204impl VirtualMethods for HTMLProgressElement {
205    fn super_type(&self) -> Option<&dyn VirtualMethods> {
206        Some(self.upcast::<HTMLElement>() as &dyn VirtualMethods)
207    }
208
209    fn attribute_mutated(
210        &self,
211        cx: &mut js::context::JSContext,
212        attr: AttrRef<'_>,
213        mutation: AttributeMutation,
214    ) {
215        self.super_type()
216            .unwrap()
217            .attribute_mutated(cx, attr, mutation);
218
219        let is_important_attribute = matches!(
220            attr.local_name(),
221            &local_name!("value") | &local_name!("max")
222        );
223        if is_important_attribute {
224            self.update_state(cx);
225        }
226    }
227
228    fn bind_to_tree(&self, cx: &mut JSContext, context: &BindContext) {
229        self.super_type().unwrap().bind_to_tree(cx, context);
230
231        self.update_state(cx);
232    }
233}
script/dom/html/htmlprogresselement.rs

script/dom/html/
htmlprogresselement.rs
