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[Annotation] Add a div containing the text of a FreeText annotation (bug 1780375)

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An annotation doesn't have to be in the text flow, hence it's likely a bad idea
to insert its text in the text layer. But the text must be visible from a screen
reader point of view so it must somewhere in the DOM.
So with this patch, the text from a FreeText annotation is extracted and added in
a div in its HTML counterpart, and with the patch #15237 the text should be visible
and positioned relatively to the text flow.
This commit is contained in:
Calixte Denizet 2022-08-03 12:03:49 +02:00
parent 159f853e06
commit 31155740c3
7 changed files with 178 additions and 20 deletions
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64
src/core/document.js
View file

@ -578,30 +578,56 @@ class Page {
return tree;
}
getAnnotationsData(intent) {
return this._parsedAnnotations.then(function (annotations) {
const annotationsData = [];
async getAnnotationsData(handler, task, intent) {
const annotations = await this._parsedAnnotations;
if (annotations.length === 0) {
return [];
}
if (annotations.length === 0) {
return annotationsData;
const textContentPromises = [];
const annotationsData = [];
let partialEvaluator;
const intentAny = !!(intent & RenderingIntentFlag.ANY),
intentDisplay = !!(intent & RenderingIntentFlag.DISPLAY),
intentPrint = !!(intent & RenderingIntentFlag.PRINT);
for (const annotation of annotations) {
// Get the annotation even if it's hidden because
// JS can change its display.
const isVisible = intentAny || (intentDisplay && annotation.viewable);
if (isVisible || (intentPrint && annotation.printable)) {
annotationsData.push(annotation.data);
}
const intentAny = !!(intent & RenderingIntentFlag.ANY),
intentDisplay = !!(intent & RenderingIntentFlag.DISPLAY),
intentPrint = !!(intent & RenderingIntentFlag.PRINT);
for (const annotation of annotations) {
// Get the annotation even if it's hidden because
// JS can change its display.
if (
intentAny ||
(intentDisplay && annotation.viewable) ||
(intentPrint && annotation.printable)
) {
annotationsData.push(annotation.data);
if (annotation.hasTextContent && isVisible) {
if (!partialEvaluator) {
partialEvaluator = new PartialEvaluator({
xref: this.xref,
handler,
pageIndex: this.pageIndex,
idFactory: this._localIdFactory,
fontCache: this.fontCache,
builtInCMapCache: this.builtInCMapCache,
standardFontDataCache: this.standardFontDataCache,
globalImageCache: this.globalImageCache,
options: this.evaluatorOptions,
});
}
textContentPromises.push(
annotation
.extractTextContent(partialEvaluator, task, this.view)
.catch(function (reason) {
warn(
`getAnnotationsData - ignoring textContent during "${task.name}" task: "${reason}".`
);
})
);
}
return annotationsData;
});
}
await Promise.all(textContentPromises);
return annotationsData;
}
get annotations() {