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Paginator: fix visible range in Firefox

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John Factotum
2024-09-24 11:34:57 +08:00
parent 4ef87c2ca7
commit 59bb647057
1 changed files with 19 additions and 4 deletions
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paginator.js
+19 -4
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@@ -64,6 +64,21 @@ const { SHOW_ELEMENT, SHOW_TEXT, SHOW_CDATA_SECTION,
const filter = SHOW_ELEMENT | SHOW_TEXT | SHOW_CDATA_SECTION const filter = SHOW_ELEMENT | SHOW_TEXT | SHOW_CDATA_SECTION
// needed cause there seems to be a bug in `getBoundingClientRect()` in Firefox
// where it fails to include rects that have zero width and non-zero height
// (CSSOM spec says "rectangles [...] of which the height or width is not zero")
// which makes the visible range to include an extra space at column boundaries
const getBoundingClientRect = target => {
let top = Infinity, right = -Infinity, left = Infinity, bottom = -Infinity
for (const rect of target.getClientRects()) {
left = Math.min(left, rect.left)
top = Math.min(top, rect.top)
right = Math.max(right, rect.right)
bottom = Math.max(bottom, rect.bottom)
}
return new DOMRect(left, top, right - left, bottom - top)
}
const getVisibleRange = (doc, start, end, mapRect) => { const getVisibleRange = (doc, start, end, mapRect) => {
// first get all visible nodes // first get all visible nodes
const acceptNode = node => { const acceptNode = node => {
@@ -104,15 +119,15 @@ const getVisibleRange = (doc, start, end, mapRect) => {
// find the offset at which visibility changes // find the offset at which visibility changes
const startOffset = from.nodeType === 1 ? 0 const startOffset = from.nodeType === 1 ? 0
: bisectNode(doc, from, (a, b) => { : bisectNode(doc, from, (a, b) => {
const p = mapRect(a.getBoundingClientRect()) const p = mapRect(getBoundingClientRect(a))
const q = mapRect(b.getBoundingClientRect()) const q = mapRect(getBoundingClientRect(b))
if (p.right < start && q.left > start) return 0 if (p.right < start && q.left > start) return 0
return q.left > start ? -1 : 1 return q.left > start ? -1 : 1
}) })
const endOffset = to.nodeType === 1 ? 0 const endOffset = to.nodeType === 1 ? 0
: bisectNode(doc, to, (a, b) => { : bisectNode(doc, to, (a, b) => {
const p = mapRect(a.getBoundingClientRect()) const p = mapRect(getBoundingClientRect(a))
const q = mapRect(b.getBoundingClientRect()) const q = mapRect(getBoundingClientRect(b))
if (p.right < end && q.left > end) return 0 if (p.right < end && q.left > end) return 0
return q.left > end ? -1 : 1 return q.left > end ? -1 : 1
}) })