HTML image map support

This commit is contained in:
bachar 2016-12-01 21:23:22 -05:00 committed by Manish Goregaokar
parent c784bc6944
commit 980dde7e15
7 changed files with 463 additions and 2 deletions

View file

@ -576,7 +576,7 @@ fn is_current_browsing_context(target: DOMString) -> bool {
}
/// https://html.spec.whatwg.org/multipage/#following-hyperlinks-2
fn follow_hyperlink(subject: &Element, hyperlink_suffix: Option<String>, referrer_policy: Option<ReferrerPolicy>) {
pub fn follow_hyperlink(subject: &Element, hyperlink_suffix: Option<String>, referrer_policy: Option<ReferrerPolicy>) {
// Step 1: replace.
// Step 2: source browsing context.
// Step 3: target browsing context.

View file

@ -2,6 +2,8 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use dom::activation::Activatable;
use dom::bindings::codegen::Bindings::DOMTokenListBinding::DOMTokenListMethods;
use dom::bindings::codegen::Bindings::HTMLAreaElementBinding;
use dom::bindings::codegen::Bindings::HTMLAreaElementBinding::HTMLAreaElementMethods;
use dom::bindings::inheritance::Castable;
@ -9,13 +11,208 @@ use dom::bindings::js::{MutNullableJS, Root};
use dom::bindings::str::DOMString;
use dom::document::Document;
use dom::domtokenlist::DOMTokenList;
use dom::element::Element;
use dom::event::Event;
use dom::eventtarget::EventTarget;
use dom::htmlanchorelement::follow_hyperlink;
use dom::htmlelement::HTMLElement;
use dom::node::Node;
use dom::node::{Node, document_from_node};
use dom::virtualmethods::VirtualMethods;
use euclid::point::Point2D;
use html5ever_atoms::LocalName;
use net_traits::ReferrerPolicy;
use std::default::Default;
use std::f32;
use style::attr::AttrValue;
#[derive(PartialEq)]
#[derive(Debug)]
pub enum Area {
Circle { left: f32, top: f32, radius: f32 },
Rectangle { top_left: (f32, f32), bottom_right: (f32, f32) },
Polygon { points: Vec<f32> },
}
pub enum Shape {
Circle,
Rectangle,
Polygon,
}
// https://html.spec.whatwg.org/multipage/#rules-for-parsing-a-list-of-floating-point-numbers
// https://html.spec.whatwg.org/multipage/#image-map-processing-model
impl Area {
pub fn parse(coord: &str, target: Shape) -> Option<Area> {
let points_count = match target {
Shape::Circle => 3,
Shape::Rectangle => 4,
Shape::Polygon => 0,
};
let size = coord.len();
let num = coord.as_bytes();
let mut index = 0;
// Step 4: Walk till char is not a delimiter
while index < size {
let val = num[index];
match val {
b',' | b';' | b' ' | b'\t' | b'\n' | 0x0C | b'\r' => {},
_ => break,
}
index += 1;
}
//This vector will hold all parsed coordinates
let mut number_list = Vec::new();
let mut array = Vec::new();
let ar_ref = &mut array;
// Step 5: walk till end of string
while index < size {
// Step 5.1: walk till we hit a valid char i.e., 0 to 9, dot or dash, e, E
while index < size {
let val = num[index];
match val {
b'0'...b'9' | b'.' | b'-' | b'E' | b'e' => break,
_ => {},
}
index += 1;
}
// Step 5.2: collect valid symbols till we hit another delimiter
while index < size {
let val = num[index];
match val {
b',' | b';' | b' ' | b'\t' | b'\n' | 0x0C | b'\r' => break,
_ => (*ar_ref).push(val),
}
index += 1;
}
// The input does not consist any valid charecters
if (*ar_ref).is_empty() {
break;
}
// Convert String to float
match String::from_utf8((*ar_ref).clone()).unwrap().parse::<f32>() {
Ok(v) => number_list.push(v),
Err(_) => number_list.push(0.0),
};
(*ar_ref).clear();
// For rectangle and circle, stop parsing once we have three
// and four coordinates respectively
if points_count > 0 && number_list.len() == points_count {
break;
}
}
let final_size = number_list.len();
match target {
Shape::Circle => {
if final_size == 3 {
if number_list[2] <= 0.0 {
None
} else {
Some(Area::Circle {
left: number_list[0],
top: number_list[1],
radius: number_list[2]
})
}
} else {
None
}
},
Shape::Rectangle => {
if final_size == 4 {
if number_list[0] > number_list[2] {
number_list.swap(0, 2);
}
if number_list[1] > number_list[3] {
number_list.swap(1, 3);
}
Some(Area::Rectangle {
top_left: (number_list[0], number_list[1]),
bottom_right: (number_list[2], number_list[3])
})
} else {
None
}
},
Shape::Polygon => {
if final_size >= 6 {
if final_size % 2 != 0 {
// Drop last element if there are odd number of coordinates
number_list.remove(final_size - 1);
}
Some(Area::Polygon { points: number_list })
} else {
None
}
},
}
}
pub fn hit_test(&self, p: Point2D<f32>) -> bool {
match *self {
Area::Circle { left, top, radius } => {
(p.x - left) * (p.x - left) +
(p.y - top) * (p.y - top) -
radius * radius <= 0.0
},
Area::Rectangle { top_left, bottom_right } => {
p.x <= bottom_right.0 && p.x >= top_left.0 &&
p.y <= bottom_right.1 && p.y >= top_left.1
},
//TODO polygon hit_test
_ => false,
}
}
pub fn absolute_coords(&self, p: Point2D<f32>) -> Area {
match *self {
Area::Rectangle { top_left, bottom_right } => {
Area::Rectangle {
top_left: (top_left.0 + p.x, top_left.1 + p.y),
bottom_right: (bottom_right.0 + p.x, bottom_right.1 + p.y)
}
},
Area::Circle { left, top, radius } => {
Area::Circle {
left: (left + p.x),
top: (top + p.y),
radius: radius
}
},
Area::Polygon { ref points } => {
// let new_points = Vec::new();
let iter = points.iter().enumerate().map(|(index, point)| {
match index % 2 {
0 => point + p.x as f32,
_ => point + p.y as f32,
}
});
Area::Polygon { points: iter.collect::<Vec<_>>() }
},
}
}
}
#[dom_struct]
pub struct HTMLAreaElement {
htmlelement: HTMLElement,
@ -38,6 +235,26 @@ impl HTMLAreaElement {
document,
HTMLAreaElementBinding::Wrap)
}
pub fn get_shape_from_coords(&self) -> Option<Area> {
let elem = self.upcast::<Element>();
let shape = elem.get_string_attribute(&"shape".into());
let shp: Shape = match shape.to_lowercase().as_ref() {
"circle" => Shape::Circle,
"circ" => Shape::Circle,
"rectangle" => Shape::Rectangle,
"rect" => Shape::Rectangle,
"polygon" => Shape::Rectangle,
"poly" => Shape::Polygon,
_ => return None,
};
if elem.has_attribute(&"coords".into()) {
let attribute = elem.get_string_attribute(&"coords".into());
Area::parse(&attribute, shp)
} else {
None
}
}
}
impl VirtualMethods for HTMLAreaElement {
@ -61,3 +278,40 @@ impl HTMLAreaElementMethods for HTMLAreaElement {
})
}
}
impl Activatable for HTMLAreaElement {
// https://html.spec.whatwg.org/multipage/#the-area-element:activation-behaviour
fn as_element(&self) -> &Element {
self.upcast::<Element>()
}
fn is_instance_activatable(&self) -> bool {
self.as_element().has_attribute(&local_name!("href"))
}
fn pre_click_activation(&self) {
}
fn canceled_activation(&self) {
}
fn implicit_submission(&self, _ctrl_key: bool, _shift_key: bool,
_alt_key: bool, _meta_key: bool) {
}
fn activation_behavior(&self, _event: &Event, _target: &EventTarget) {
// Step 1
let doc = document_from_node(self);
if !doc.is_fully_active() {
return;
}
// Step 2
// TODO : We should be choosing a browsing context and navigating to it.
// Step 3
let referrer_policy = match self.RelList().Contains("noreferrer".into()) {
true => Some(ReferrerPolicy::NoReferrer),
false => None,
};
follow_hyperlink(self.upcast::<Element>(), None, referrer_policy);
}
}

View file

@ -3,10 +3,14 @@
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use app_units::{Au, AU_PER_PX};
use dom::activation::Activatable;
use dom::attr::Attr;
use dom::bindings::cell::DOMRefCell;
use dom::bindings::codegen::Bindings::DOMRectBinding::DOMRectBinding::DOMRectMethods;
use dom::bindings::codegen::Bindings::ElementBinding::ElementBinding::ElementMethods;
use dom::bindings::codegen::Bindings::HTMLImageElementBinding;
use dom::bindings::codegen::Bindings::HTMLImageElementBinding::HTMLImageElementMethods;
use dom::bindings::codegen::Bindings::MouseEventBinding::MouseEventMethods;
use dom::bindings::codegen::Bindings::WindowBinding::WindowMethods;
use dom::bindings::error::Fallible;
use dom::bindings::inheritance::Castable;
@ -15,17 +19,23 @@ use dom::bindings::refcounted::Trusted;
use dom::bindings::str::DOMString;
use dom::document::Document;
use dom::element::{AttributeMutation, Element, RawLayoutElementHelpers};
use dom::event::Event;
use dom::eventtarget::EventTarget;
use dom::htmlareaelement::HTMLAreaElement;
use dom::htmlelement::HTMLElement;
use dom::htmlmapelement::HTMLMapElement;
use dom::mouseevent::MouseEvent;
use dom::node::{Node, NodeDamage, document_from_node, window_from_node};
use dom::values::UNSIGNED_LONG_MAX;
use dom::virtualmethods::VirtualMethods;
use dom::window::Window;
use euclid::point::Point2D;
use html5ever_atoms::LocalName;
use ipc_channel::ipc;
use ipc_channel::router::ROUTER;
use net_traits::image::base::{Image, ImageMetadata};
use net_traits::image_cache_thread::{ImageResponder, ImageResponse};
use num_traits::ToPrimitive;
use script_thread::Runnable;
use servo_url::ServoUrl;
use std::i32;
@ -234,6 +244,38 @@ impl HTMLImageElement {
Ok(image)
}
pub fn areas(&self) -> Option<Vec<Root<HTMLAreaElement>>> {
let elem = self.upcast::<Element>();
let usemap_attr;
if elem.has_attribute(&LocalName::from("usemap")) {
usemap_attr = elem.get_string_attribute(&local_name!("usemap"));
} else {
return None;
}
let (first, last) = usemap_attr.split_at(1);
match first {
"#" => {},
_ => return None,
};
match last.len() {
0 => return None,
_ => {},
};
let map = self.upcast::<Node>()
.following_siblings()
.filter_map(Root::downcast::<HTMLMapElement>)
.find(|n| n.upcast::<Element>().get_string_attribute(&LocalName::from("name")) == last);
let elements: Vec<Root<HTMLAreaElement>> = map.unwrap().upcast::<Node>()
.children()
.filter_map(Root::downcast::<HTMLAreaElement>)
.collect();
Some(elements)
}
}
pub trait LayoutHTMLImageElementHelpers {
@ -429,6 +471,43 @@ impl VirtualMethods for HTMLImageElement {
_ => self.super_type().unwrap().parse_plain_attribute(name, value),
}
}
fn handle_event(&self, event: &Event) {
if (event.type_() == atom!("click")) {
let area_elements = self.areas();
let elements = if let Some(x) = area_elements {
x
} else {
return
};
// Fetch click coordinates
let mouse_event = if let Some(x) = event.downcast::<MouseEvent>() {
x
} else {
return;
};
let point = Point2D::new(mouse_event.ClientX().to_f32().unwrap(), mouse_event.ClientY().to_f32().unwrap());
// Walk HTMLAreaElements
let mut index = 0;
while index < elements.len() {
let shape = elements[index].get_shape_from_coords();
let p = Point2D::new(self.upcast::<Element>().GetBoundingClientRect().X() as f32,
self.upcast::<Element>().GetBoundingClientRect().Y() as f32);
let shp = if let Some(x) = shape {
x.absolute_coords(p)
} else {
return
};
if shp.hit_test(point) {
elements[index].activation_behavior(event, self.upcast());
return
}
index += 1;
}
}
}
}
fn image_dimension_setter(element: &Element, attr: LocalName, value: u32) {