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XFA - Support aria heading and table structure. (bug 1723421) (bug 1723425)

Browse source 
https://bugzilla.mozilla.org/show_bug.cgi?id=1723421
https://bugzilla.mozilla.org/show_bug.cgi?id=1723425
This commit is contained in:
Brendan Dahl 2021-08-04 18:40:14 -07:00
parent 849bab973c
commit a38d1122d8
2 changed files with 167 additions and 19 deletions
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56
src/core/xfa/template.js
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@ -121,6 +121,8 @@ const MAX_EMPTY_PAGES = 3;
// Default value to start with for the tabIndex property.
const DEFAULT_TAB_INDEX = 5000;
const HEADING_PATTERN = /^H(\d+)$/;
function getBorderDims(node) {
if (!node || !node.border) {
return { w: 0, h: 0 };
@ -210,6 +212,40 @@ function setTabIndex(node) {
}
}
function applyAssist(obj, attributes) {
const assist = obj.assist;
if (assist) {
const assistTitle = assist[$toHTML]();
if (assistTitle) {
attributes.title = assistTitle;
}
const role = assist.role;
const match = role.match(HEADING_PATTERN);
if (match) {
const ariaRole = "heading";
const ariaLevel = match[1];
attributes.role = ariaRole;
attributes["aria-level"] = ariaLevel;
}
}
// XXX: We could end up in a situation where the obj has a heading role and
// is also a table. For now prioritize the table role.
if (obj.layout === "table") {
attributes.role = "table";
} else if (obj.layout === "row") {
attributes.role = "row";
} else {
const parent = obj[$getParent]();
if (parent.layout === "row") {
if (parent.assist && parent.assist.role === "TH") {
attributes.role = "columnheader";
} else {
attributes.role = "cell";
}
}
}
}
function ariaLabel(obj) {
if (!obj.assist) {
return null;
@ -1849,10 +1885,7 @@ class Draw extends XFAObject {
children: [],
};
const assist = this.assist ? this.assist[$toHTML]() : null;
if (assist) {
html.attributes.title = assist;
}
applyAssist(this, attributes);
const bbox = computeBbox(this, html, availableSpace);
@ -2475,10 +2508,7 @@ class ExclGroup extends XFAObject {
children,
};
const assist = this.assist ? this.assist[$toHTML]() : null;
if (assist) {
html.attributes.title = assist;
}
applyAssist(this, attributes);
delete this[$extra];
@ -2816,10 +2846,7 @@ class Field extends XFAObject {
children,
};
const assist = this.assist ? this.assist[$toHTML]() : null;
if (assist) {
html.attributes.title = assist;
}
applyAssist(this, attributes);
const borderStyle = this.border ? this.border[$toStyle]() : null;
const bbox = computeBbox(this, html, availableSpace);
@ -5105,10 +5132,7 @@ class Subform extends XFAObject {
children,
};
const assist = this.assist ? this.assist[$toHTML]() : null;
if (assist) {
html.attributes.title = assist;
}
applyAssist(this, attributes);
const result = HTMLResult.success(createWrapper(this, html), bbox);