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Improve definition of caretRangeFromPoint

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This commit is contained in:
toasted-nutbread 2019-08-31 17:39:13 -04:00
parent 548607ea7f
commit d296ebd593
1 changed files with 26 additions and 12 deletions
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38
ext/fg/js/document.js
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@ -105,8 +105,8 @@ function docRangeFromPoint({x, y}) {
}
}
const range = document.caretRangeFromPoint(x, y);
if (range !== null && isPointInRange(point, range)) {
const range = caretRangeFromPoint(x, y);
if (range !== null) {
if (imposter !== null) {
docSetImposterStyle(imposterContainer.style, 'z-index', '-2147483646');
docSetImposterStyle(imposter.style, 'pointer-events', 'none');
@ -235,15 +235,29 @@ function isPointInRect(x, y, rect) {
y >= rect.top && y < rect.bottom);
}
if (typeof document.caretRangeFromPoint !== 'function') {
document.caretRangeFromPoint = (x, y) => {
const position = document.caretPositionFromPoint(x, y);
if (position && position.offsetNode && position.offsetNode.nodeType === Node.TEXT_NODE) {
const caretRangeFromPoint = (() => {
if (typeof document.caretRangeFromPoint === 'function') {
// Chrome, Edge
return (x, y) => document.caretRangeFromPoint(x, y);
}
if (typeof document.caretPositionFromPoint === 'function') {
// Firefox
return (x, y) => {
const position = document.caretPositionFromPoint(x, y);
const node = position.offsetNode;
if (node === null) {
return null;
}
const range = document.createRange();
range.setStart(position.offsetNode, position.offset);
range.setEnd(position.offsetNode, position.offset);
const offset = (node.nodeType === Node.TEXT_NODE ? position.offset : 0);
range.setStart(node, offset);
range.setEnd(node, offset);
return range;
}
return null;
};
}
};
}
// No support
return () => null;
})();