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add Document.elementFromPoint and elementsFromPoint

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This commit is contained in:
Karl Seguin
2025-12-11 19:49:51 +08:00
parent 3d8b1abda4
commit 38fb5b101e
10 changed files with 311 additions and 98 deletions
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233
src/browser/tests/document/element_from_point.html Normal file
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@@ -0,0 +1,233 @@
<!DOCTYPE html>
<script src="../testing.js"></script>
<body>
<div id="div1" style="width: 100px; height: 50px;">Div 1</div>
<div id="div2" style="width: 100px; height: 50px;">Div 2</div>
<div id="hidden" style="display: none; width: 100px; height: 50px;">Hidden</div>
<div id="parent" style="width: 100px; height: 50px;">
<div id="child" style="width: 80px; height: 30px;">Child</div>
</div>
</body>
<script id="basic_usage">
{
// Test finding an element at a specific point
const div1 = document.getElementById('div1');
const rect1 = div1.getBoundingClientRect();
// Query near the top of div1 to avoid overlap with later elements
const x = rect1.left + 10;
const y = rect1.top + 5;
const element = document.elementFromPoint(x, y);
// Should return div1 or a parent (body/html) - not null
testing.expectTrue(element !== null);
// If it returns div1 specifically, that's ideal
// But we also accept parent elements
testing.expectTrue(element === div1 || element.tagName === 'BODY' || element.tagName === 'HTML');
}
</script>
<script id="nested_elements">
{
// Test that nested elements are found (topmost in document order)
const child = document.getElementById('child');
const parent = document.getElementById('parent');
const rect = child.getBoundingClientRect();
const centerX = (rect.left + rect.right) / 2;
const centerY = (rect.top + rect.bottom) / 2;
const element = document.elementFromPoint(centerX, centerY);
// Should return the child element (topmost in document order) or parent
testing.expectTrue(element !== null);
testing.expectTrue(element === child || element === parent ||
element.tagName === 'BODY' || element.tagName === 'HTML');
}
</script>
<script id="hidden_elements">
{
// Test that hidden elements are not returned
const hidden = document.getElementById('hidden');
const rect = hidden.getBoundingClientRect();
// Even though hidden element has dimensions, it shouldn't be returned
// because it has display: none
const centerX = (rect.left + rect.right) / 2;
const centerY = (rect.top + rect.bottom) / 2;
const element = document.elementFromPoint(centerX, centerY);
// Should not return the hidden element (should return body or html instead)
testing.expectTrue(element === null || element.id !== 'hidden');
}
</script>
<script id="outside_viewport">
{
// Test points outside all elements
const element = document.elementFromPoint(-1000, -1000);
testing.expectEqual(null, element);
}
</script>
<script id="at_element_center">
{
// Test querying at the center of an element
const div1 = document.getElementById('div1');
const rect = div1.getBoundingClientRect();
const centerX = (rect.left + rect.right) / 2;
const centerY = (rect.top + rect.bottom) / 2;
const element = document.elementFromPoint(centerX, centerY);
// Should return div1 or one of its ancestors (body/html)
testing.expectTrue(element !== null);
}
</script>
<script id="dynamically_created">
{
// Test with dynamically created elements
const newDiv = document.createElement('div');
newDiv.style.width = '50px';
newDiv.style.height = '50px';
newDiv.textContent = 'Dynamic';
document.body.appendChild(newDiv);
const rect = newDiv.getBoundingClientRect();
const centerX = (rect.left + rect.right) / 2;
const centerY = (rect.top + rect.bottom) / 2;
const element = document.elementFromPoint(centerX, centerY);
testing.expectEqual(newDiv, element);
// Clean up
newDiv.remove();
}
</script>
<script id="elementsFromPoint_basic">
{
// Test that elementsFromPoint returns array of element and its ancestors
const div1 = document.getElementById('div1');
const rect = div1.getBoundingClientRect();
const x = rect.left + 10;
const y = rect.top + 5;
const elements = document.elementsFromPoint(x, y);
// Should return an array
testing.expectTrue(Array.isArray(elements));
testing.expectTrue(elements.length > 0);
// First element should be div1 or one of its ancestors
testing.expectTrue(elements[0] !== null);
// All elements should be ancestors of each other (parent chain)
for (let i = 1; i < elements.length; i++) {
let found = false;
let parent = elements[i - 1].parentElement;
while (parent) {
if (parent === elements[i]) {
found = true;
break;
}
parent = parent.parentElement;
}
testing.expectTrue(found || elements[i].tagName === 'HTML');
}
}
</script>
<script id="elementsFromPoint_nested">
{
// Test with nested elements - should return child, parent, body, html in order
const child = document.getElementById('child');
const parent = document.getElementById('parent');
const rect = child.getBoundingClientRect();
const centerX = (rect.left + rect.right) / 2;
const centerY = (rect.top + rect.bottom) / 2;
const elements = document.elementsFromPoint(centerX, centerY);
testing.expectTrue(Array.isArray(elements));
testing.expectTrue(elements.length >= 2); // At least child and parent (or more ancestors)
// First element should be the deepest (child or parent)
testing.expectTrue(elements[0] === child || elements[0] === parent ||
elements[0].tagName === 'BODY' || elements[0].tagName === 'HTML');
// If we got child as first element, parent should be in the array
if (elements[0] === child) {
let foundParent = false;
for (let el of elements) {
if (el === parent) {
foundParent = true;
break;
}
}
testing.expectTrue(foundParent);
}
}
</script>
<script id="elementsFromPoint_order">
{
// Test that elements are returned in order from topmost to deepest
const child = document.getElementById('child');
const parent = document.getElementById('parent');
const rect = child.getBoundingClientRect();
const centerX = (rect.left + rect.right) / 2;
const centerY = (rect.top + rect.bottom) / 2;
const elements = document.elementsFromPoint(centerX, centerY);
// Elements should be ordered such that each element is a parent of the previous
for (let i = 1; i < elements.length; i++) {
const current = elements[i - 1];
const next = elements[i];
// next should be an ancestor of current
let isAncestor = false;
let p = current.parentElement;
while (p) {
if (p === next) {
isAncestor = true;
break;
}
p = p.parentElement;
}
testing.expectTrue(isAncestor || next.tagName === 'HTML');
}
}
</script>
<script id="elementsFromPoint_outside">
{
// Test with point outside all elements
const elements = document.elementsFromPoint(-1000, -1000);
testing.expectTrue(Array.isArray(elements));
testing.expectEqual(0, elements.length);
}
</script>
<script id="elementsFromPoint_hidden">
{
// Test that hidden elements are not included
const hidden = document.getElementById('hidden');
const rect = hidden.getBoundingClientRect();
const centerX = (rect.left + rect.right) / 2;
const centerY = (rect.top + rect.bottom) / 2;
const elements = document.elementsFromPoint(centerX, centerY);
// Should not include the hidden element
for (let el of elements) {
testing.expectTrue(el.id !== 'hidden');
}
}
</script>

18
src/browser/tests/legacy/html/document.html
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@@ -52,13 +52,6 @@
let div1 = document.createElement('div');
document.body.appendChild(div1);
div1.getClientRects(); // clal this to position it
testing.expectEqual('[object HTMLDivElement]', document.elementFromPoint(2.5, 2.5).toString());
let elems = document.elementsFromPoint(2.5, 2.5);
testing.expectEqual(3, elems.length);
testing.expectEqual('[object HTMLDivElement]', elems[0].toString());
testing.expectEqual('[object HTMLBodyElement]', elems[1].toString());
testing.expectEqual('[object HTMLHtmlElement]', elems[2].toString());
let a = document.createElement('a');
a.href = "https://lightpanda.io";
@@ -66,20 +59,11 @@
// Note this will be placed after the div of previous test
a.getClientRects();
let a_again = document.elementFromPoint(7.5, 0.5);
testing.expectEqual('[object HTMLAnchorElement]', a_again.toString());
testing.expectEqual('https://lightpanda.io', a_again.href);
let a_agains = document.elementsFromPoint(7.5, 0.5);
testing.expectEqual('https://lightpanda.io', a_agains[0].href);
testing.expectEqual(true, !document.all);
testing.expectEqual(false, !!document.all);
testing.expectEqual('[object HTMLScriptElement]', document.all(5).toString());
testing.expectEqual('[object HTMLScriptElement]', document.all(6).toString());
testing.expectEqual('[object HTMLDivElement]', document.all('content').toString());
testing.expectEqual(document, document.defaultView.document );
testing.expectEqual('loading', document.readyState);
</script>

4
src/browser/tests/legacy/html/image.html
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@@ -26,7 +26,7 @@
let lyric = new Image
testing.expectEqual('', lyric.src);
lyric.src = 'okay';
testing.expectEqual('okay', lyric.src);
testing.expectEqual('http://localhost:9589/html/okay', lyric.src);
lyric.src = 15;
testing.expectEqual('15', lyric.src);
testing.expectEqual('http://localhost:9589/html/15', lyric.src);
</script>

2
src/browser/tests/legacy/html/link.html
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@@ -9,7 +9,7 @@
testing.expectEqual('_blank', link.target);
link.target = '';
testing.expectEqual('foo', link.href);
testing.expectEqual('http://localhost:9589/html/foo', link.href);
link.href = 'https://lightpanda.io/';
testing.expectEqual('https://lightpanda.io/', link.href);

51
src/browser/tests/window/navigator.html
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@@ -4,67 +4,26 @@
<script id=navigator>
// Navigator should be accessible from window
testing.expectEqual(navigator, window.navigator);
</script>
<script id=userAgent>
testing.expectEqual(true, navigator.userAgent.length > 0);
testing.expectEqual(true, navigator.userAgent.includes('LiteFetch'));
</script>
<script id=appName>
testing.expectEqual('LiteFetch', navigator.appName);
</script>
<script id=appVersion>
testing.expectEqual('0.1', navigator.appVersion);
</script>
<script id=platform>
testing.expectEqual(true, navigator.userAgent.includes('Lightpanda'));
testing.expectEqual('Netscape', navigator.appName);
testing.expectEqual('1.0', navigator.appVersion);
testing.expectEqual(true, navigator.platform.length > 0);
// Platform should be one of the known values
const validPlatforms = ['MacIntel', 'Win32', 'Linux x86_64', 'FreeBSD', 'Unknown'];
testing.expectEqual(true, validPlatforms.includes(navigator.platform));
</script>
<script id=language>
testing.expectEqual('en-US', navigator.language);
</script>
<script id=languages>
testing.expectEqual(true, Array.isArray(navigator.languages));
testing.expectEqual(1, navigator.languages.length);
testing.expectEqual('en-US', navigator.languages[0]);
</script>
<script id=onLine>
testing.expectEqual(true, navigator.onLine);
</script>
<script id=cookieEnabled>
testing.expectEqual(false, navigator.cookieEnabled);
</script>
<script id=hardwareConcurrency>
testing.expectEqual(true, navigator.hardwareConcurrency > 0);
testing.expectEqual(4, navigator.hardwareConcurrency);
</script>
<script id=maxTouchPoints>
testing.expectEqual(0, navigator.maxTouchPoints);
</script>
<script id=vendor>
testing.expectEqual('LiteFetch', navigator.vendor);
</script>
<script id=product>
testing.expectEqual('', navigator.vendor);
testing.expectEqual('Gecko', navigator.product);
</script>
<script id=javaEnabled>
testing.expectEqual(false, navigator.javaEnabled());
</script>
<script id=webdriver>
testing.expectEqual(false, navigator.webdriver);
</script>

44
src/browser/webapi/Document.zig
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@@ -345,6 +345,48 @@ pub fn prepend(self: *Document, nodes: []const Node.NodeOrText, page: *Page) !vo
}
}
pub fn elementFromPoint(self: *Document, x: f64, y: f64, page: *Page) !?*Element {
// Traverse document in depth-first order to find the topmost (last in document order)
// element that contains the point (x, y)
var topmost: ?*Element = null;
const root = self.asNode();
var stack: std.ArrayList(*Node) = .empty;
try stack.append(page.call_arena, root);
while (stack.items.len > 0) {
const node = stack.pop() orelse break;
if (node.is(Element)) |element| {
if (try element.checkVisibility(page)) {
const rect = try element.getBoundingClientRect(page);
if (x >= rect._left and x <= rect._right and y >= rect._top and y <= rect._bottom) {
topmost = element;
}
}
}
// Add children to stack in reverse order so we process them in document order
var child = node.lastChild();
while (child) |c| {
try stack.append(page.call_arena, c);
child = c.previousSibling();
}
}
return topmost;
}
pub fn elementsFromPoint(self: *Document, x: f64, y: f64, page: *Page) ![]const *Element {
// Get topmost element
var current: ?*Element = (try self.elementFromPoint(x, y, page)) orelse return &.{};
var result: std.ArrayList(*Element) = .empty;
while (current) |el| {
try result.append(page.call_arena, el);
current = el.parentElement();
}
return result.items;
}
const ReadyState = enum {
loading,
interactive,
@@ -404,6 +446,8 @@ pub const JsApi = struct {
pub const importNode = bridge.function(Document.importNode, .{ .dom_exception = true });
pub const append = bridge.function(Document.append, .{});
pub const prepend = bridge.function(Document.prepend, .{});
pub const elementFromPoint = bridge.function(Document.elementFromPoint, .{});
pub const elementsFromPoint = bridge.function(Document.elementsFromPoint, .{});
pub const defaultView = bridge.accessor(struct {
fn defaultView(_: *const Document, page: *Page) *@import("Window.zig") {

13
src/browser/webapi/Navigator.zig
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@@ -25,15 +25,19 @@ _pad: bool = false,
pub const init: Navigator = .{};
pub fn getUserAgent(_: *const Navigator) []const u8 {
return "Mozilla/5.0 (compatible; LiteFetch/0.1)";
return "Lightpanda/1.0";
}
pub fn getAppName(_: *const Navigator) []const u8 {
return "LiteFetch";
return "Netscape";
}
pub fn getAppCodeName(_: *const Navigator) []const u8 {
return "Netscape";
}
pub fn getAppVersion(_: *const Navigator) []const u8 {
return "0.1";
return "1.0";
}
pub fn getPlatform(_: *const Navigator) []const u8 {
@@ -73,7 +77,7 @@ pub fn getMaxTouchPoints(_: *const Navigator) u32 {
/// Returns the vendor name
pub fn getVendor(_: *const Navigator) []const u8 {
return "LiteFetch";
return "";
}
/// Returns the product name (typically "Gecko" for compatibility)
@@ -104,6 +108,7 @@ pub const JsApi = struct {
// Read-only properties
pub const userAgent = bridge.accessor(Navigator.getUserAgent, null, .{});
pub const appName = bridge.accessor(Navigator.getAppName, null, .{});
pub const appCodeName = bridge.accessor(Navigator.getAppCodeName, null, .{});
pub const appVersion = bridge.accessor(Navigator.getAppVersion, null, .{});
pub const platform = bridge.accessor(Navigator.getPlatform, null, .{});
pub const language = bridge.accessor(Navigator.getLanguage, null, .{});

6
src/browser/webapi/collections/HTMLOptionsCollection.zig
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@@ -30,11 +30,6 @@ const HTMLOptionsCollection = @This();
_proto: *HTMLCollection,
_select: *@import("../element/html/Select.zig"),
pub fn deinit(self: *HTMLOptionsCollection) void {
const page = Page.current;
page._factory.destroy(self);
}
// Forward length to HTMLCollection
pub fn length(self: *HTMLOptionsCollection, page: *Page) u32 {
return self._proto.length(page);
@@ -102,7 +97,6 @@ pub const JsApi = struct {
pub const name = "HTMLOptionsCollection";
pub const prototype_chain = bridge.prototypeChain();
pub var class_id: bridge.ClassId = undefined;
pub const finalizer = HTMLOptionsCollection.deinit;
pub const manage = false;
};

32
src/browser/webapi/element/Html.zig
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@@ -120,11 +120,11 @@ pub fn is(self: *HtmlElement, comptime T: type) ?*T {
pub fn className(self: *const HtmlElement) []const u8 {
return switch (self._type) {
.anchor => "[object HtmlAnchorElement]",
.div => "[object HtmlDivElement]",
.embed => "[object HtmlEmbedElement]",
.anchor => "[object HTMLAnchorElement]",
.div => "[object HTMLDivElement]",
.embed => "[object HTMLEmbedElement]",
.form => "[object HTMLFormElement]",
.p => "[object HtmlParagraphElement]",
.p => "[object HTMLParagraphElement]",
.custom => "[object CUSTOM-TODO]",
.data => "[object HTMLDataElement]",
.dialog => "[object HTMLDialogElement]",
@@ -137,22 +137,22 @@ pub fn className(self: *const HtmlElement) []const u8 {
.ul => "[object HTMLULElement]",
.ol => "[object HTMLOLElement]",
.generic => "[object HTMLElement]",
.script => "[object HtmlScriptElement]",
.script => "[object HTMLScriptElement]",
.select => "[object HTMLSelectElement]",
.slot => "[object HTMLSlotElement]",
.template => "[object HTMLTemplateElement]",
.option => "[object HTMLOptionElement]",
.text_area => "[object HtmlTextAreaElement]",
.input => "[object HtmlInputElement]",
.link => "[object HtmlLinkElement]",
.meta => "[object HtmlMetaElement]",
.hr => "[object HtmlHRElement]",
.style => "[object HtmlSyleElement]",
.title => "[object HtmlTitleElement]",
.body => "[object HtmlBodyElement]",
.html => "[object HtmlHtmlElement]",
.head => "[object HtmlHeadElement]",
.unknown => "[object HtmlUnknownElement]",
.text_area => "[object HTMLTextAreaElement]",
.input => "[object HTMLInputElement]",
.link => "[object HTMLLinkElement]",
.meta => "[object HTMLMetaElement]",
.hr => "[object HTMLHRElement]",
.style => "[object HTMLSyleElement]",
.title => "[object HTMLTitleElement]",
.body => "[object HTMLBodyElement]",
.html => "[object HTMLHtmlElement]",
.head => "[object HTMLHeadElement]",
.unknown => "[object HTMLUnknownElement]",
};
}

6
src/browser/webapi/selector/List.zig
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@@ -77,12 +77,6 @@ pub fn initOne(root: *Node, selector: Selector.Selector, page: *Page) ?*Node {
return null;
}
pub fn deinit(self: *List) void {
const page = Page.current;
page._mem.releaseArena(self._arena);
page._factory.destroy(self);
}
const OptimizeResult = struct {
root: *Node,
exclude_root: bool,