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don't assume preceding space for emoticon at start of document

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also add more inline comments to explain what is going on
This commit is contained in:
Bruno Windels 2019-08-27 09:50:36 +02:00
parent 5c28b57681
commit 56606a46f4
1 changed files with 10 additions and 3 deletions
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13
src/components/views/rooms/BasicMessageComposer.js
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@ -78,7 +78,8 @@ export default class BasicMessageEditor extends React.Component {
_replaceEmoticon = (caret, inputType, diff) => {
const {model} = this.props;
const range = model.startRange(caret);
// expand range max 8 characters backwards from caret
// expand range max 8 characters backwards from caret,
// as a space to look for an emoticon
let n = 8;
range.expandBackwardsWhile((index, offset) => {
const part = model.parts[index];
@ -90,8 +91,14 @@ export default class BasicMessageEditor extends React.Component {
const query = emoticonMatch[1].toLowerCase().replace("-", "");
const data = EMOJIBASE.find(e => e.emoticon ? e.emoticon.toLowerCase() === query : false);
if (data) {
// + 1 because index is reported without preceding space
range.moveStart(emoticonMatch.index + 1);
const hasPrecedingSpace = emoticonMatch[0][0] === " ";
// we need the range to only comprise of the emoticon
// because we'll replace the whole range with an emoji,
// so move the start forward to the start of the emoticon.
// Take + 1 because index is reported without the possible preceding space.
range.moveStart(emoticonMatch.index + (hasPrecedingSpace ? 1 : 0));
// this returns the amount of added/removed characters during the replace
// so the caret position can be adjusted.
return range.replace([this.props.model.partCreator.plain(data.unicode + " ")]);
}
}