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Shorten the code in the web/text_layer_builder.js file

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- Use `this` rather than explicitly spelling out the class-name in the static `#enableGlobalSelectionListener` method, since that leads to shorter code. Given that all the relevant static fields are *private* ESLint will catch any scope errors in the code.

 - Reduce a little bit of duplication when using the `#selectionChangeAbortController` signal.

 - Utilize early returns in the "selectionchange" event handler, since that reduces overall indentation which helps readability a tiny bit.
This commit is contained in:
Jonas Jenwald 2024-05-23 13:39:16 +02:00
parent b7b8e5ef78
commit cb388c6658
1 changed files with 48 additions and 50 deletions
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98
web/text_layer_builder.js
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@ -188,11 +188,12 @@ class TextLayerBuilder {
}
static #enableGlobalSelectionListener() {
if (TextLayerBuilder.#selectionChangeAbortController) {
if (this.#selectionChangeAbortController) {
// document-level event listeners already installed
return;
}
TextLayerBuilder.#selectionChangeAbortController = new AbortController();
this.#selectionChangeAbortController = new AbortController();
const { signal } = this.#selectionChangeAbortController;
const reset = (end, textLayer) => {
if (typeof PDFJSDev === "undefined" || !PDFJSDev.test("MOZCENTRAL")) {
@ -206,9 +207,9 @@ class TextLayerBuilder {
document.addEventListener(
"pointerup",
() => {
TextLayerBuilder.#textLayers.forEach(reset);
this.#textLayers.forEach(reset);
},
{ signal: TextLayerBuilder.#selectionChangeAbortController.signal }
{ signal }
);
if (typeof PDFJSDev === "undefined" || !PDFJSDev.test("MOZCENTRAL")) {
@ -221,7 +222,7 @@ class TextLayerBuilder {
() => {
const selection = document.getSelection();
if (selection.rangeCount === 0) {
TextLayerBuilder.#textLayers.forEach(reset);
this.#textLayers.forEach(reset);
return;
}
@ -232,7 +233,7 @@ class TextLayerBuilder {
const activeTextLayers = new Set();
for (let i = 0; i < selection.rangeCount; i++) {
const range = selection.getRangeAt(i);
for (const textLayerDiv of TextLayerBuilder.#textLayers.keys()) {
for (const textLayerDiv of this.#textLayers.keys()) {
if (
!activeTextLayers.has(textLayerDiv) &&
range.intersectsNode(textLayerDiv)
@ -242,7 +243,7 @@ class TextLayerBuilder {
}
}
for (const [textLayerDiv, endDiv] of TextLayerBuilder.#textLayers) {
for (const [textLayerDiv, endDiv] of this.#textLayers) {
if (activeTextLayers.has(textLayerDiv)) {
endDiv.classList.add("active");
} else {
@ -250,53 +251,50 @@ class TextLayerBuilder {
}
}
if (typeof PDFJSDev === "undefined" || !PDFJSDev.test("MOZCENTRAL")) {
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("CHROME")) {
isFirefox = false;
} else {
isFirefox ??=
getComputedStyle(
TextLayerBuilder.#textLayers.values().next().value
).getPropertyValue("-moz-user-select") === "none";
}
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
return;
}
if (typeof PDFJSDev === "undefined" || !PDFJSDev.test("CHROME")) {
isFirefox ??=
getComputedStyle(
this.#textLayers.values().next().value
).getPropertyValue("-moz-user-select") === "none";
if (!isFirefox) {
// In non-Firefox browsers, when hovering over an empty space (thus,
// on .endOfContent), the selection will expand to cover all the
// text between the current selection and .endOfContent. By moving
// .endOfContent to right after (or before, depending on which side
// of the selection the user is moving), we limit the selection jump
// to at most cover the enteirety of the <span> where the selection
// is being modified.
const range = selection.getRangeAt(0);
const modifyStart =
prevRange &&
(range.compareBoundaryPoints(Range.END_TO_END, prevRange) === 0 ||
range.compareBoundaryPoints(Range.START_TO_END, prevRange) ===
0);
let anchor = modifyStart
? range.startContainer
: range.endContainer;
if (anchor.nodeType === Node.TEXT_NODE) {
anchor = anchor.parentNode;
}
const parentTextLayer = anchor.parentElement.closest(".textLayer");
const endDiv = TextLayerBuilder.#textLayers.get(parentTextLayer);
if (endDiv) {
endDiv.style.width = parentTextLayer.style.width;
endDiv.style.height = parentTextLayer.style.height;
anchor.parentElement.insertBefore(
endDiv,
modifyStart ? anchor : anchor.nextSibling
);
}
prevRange = range.cloneRange();
if (isFirefox) {
return;
}
}
// In non-Firefox browsers, when hovering over an empty space (thus,
// on .endOfContent), the selection will expand to cover all the
// text between the current selection and .endOfContent. By moving
// .endOfContent to right after (or before, depending on which side
// of the selection the user is moving), we limit the selection jump
// to at most cover the enteirety of the <span> where the selection
// is being modified.
const range = selection.getRangeAt(0);
const modifyStart =
prevRange &&
(range.compareBoundaryPoints(Range.END_TO_END, prevRange) === 0 ||
range.compareBoundaryPoints(Range.START_TO_END, prevRange) === 0);
let anchor = modifyStart ? range.startContainer : range.endContainer;
if (anchor.nodeType === Node.TEXT_NODE) {
anchor = anchor.parentNode;
}
const parentTextLayer = anchor.parentElement.closest(".textLayer");
const endDiv = this.#textLayers.get(parentTextLayer);
if (endDiv) {
endDiv.style.width = parentTextLayer.style.width;
endDiv.style.height = parentTextLayer.style.height;
anchor.parentElement.insertBefore(
endDiv,
modifyStart ? anchor : anchor.nextSibling
);
}
prevRange = range.cloneRange();
},
{ signal: TextLayerBuilder.#selectionChangeAbortController.signal }
{ signal }
);
}
}