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Merge pull request #1299 from matrix-org/luke/fix-text-offsets-to-selection-state

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Fix bugs in textOffsetsToSelectionState
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Luke Barnard 2017-08-15 11:37:35 +01:00 committed by GitHub
commit 472b5b5350
1 changed files with 25 additions and 16 deletions
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41
src/RichText.js
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@ -202,25 +202,34 @@ export function selectionStateToTextOffsets(selectionState: SelectionState,
export function textOffsetsToSelectionState({start, end}: SelectionRange,
contentBlocks: Array<ContentBlock>): SelectionState {
let selectionState = SelectionState.createEmpty();
// Subtract block lengths from `start` and `end` until they are less than the current
// block length (accounting for the NL at the end of each block). Set them to -1 to
// indicate that the corresponding selection state has been determined.
for (const block of contentBlocks) {
const blockLength = block.getLength();
if (start !== -1 && start < blockLength) {
selectionState = selectionState.merge({
anchorKey: block.getKey(),
anchorOffset: start,
});
start = -1;
} else {
start -= blockLength + 1; // +1 to account for newline between blocks
// -1 indicating that the position start position has been found
if (start !== -1) {
if (start < blockLength + 1) {
selectionState = selectionState.merge({
anchorKey: block.getKey(),
anchorOffset: start,
});
start = -1; // selection state for the start calculated
} else {
start -= blockLength + 1; // +1 to account for newline between blocks
}
}
if (end !== -1 && end <= blockLength) {
selectionState = selectionState.merge({
focusKey: block.getKey(),
focusOffset: end,
});
end = -1;
} else {
end -= blockLength + 1; // +1 to account for newline between blocks
// -1 indicating that the position end position has been found
if (end !== -1) {
if (end < blockLength + 1) {
selectionState = selectionState.merge({
focusKey: block.getKey(),
focusOffset: end,
});
end = -1; // selection state for the end calculated
} else {
end -= blockLength + 1; // +1 to account for newline between blocks
}
}
}
return selectionState;