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9e0816c51c
instead of having the same logic twice
83 lines
2.7 KiB
JavaScript
83 lines
2.7 KiB
JavaScript
/*
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Copyright 2019 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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function walkDOMDepthFirst(editor, enterNodeCallback, leaveNodeCallback) {
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let node = editor.firstChild;
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while (node && node !== editor) {
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enterNodeCallback(node);
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if (node.firstChild) {
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node = node.firstChild;
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} else if (node.nextSibling) {
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node = node.nextSibling;
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} else {
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while (!node.nextSibling && node !== editor) {
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node = node.parentElement;
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if (node !== editor) {
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leaveNodeCallback(node);
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}
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}
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if (node !== editor) {
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node = node.nextSibling;
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}
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}
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}
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}
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export function getCaretOffsetAndText(editor, sel) {
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let {focusOffset, focusNode} = sel;
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let caretOffset = focusOffset;
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let foundCaret = false;
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let text = "";
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if (focusNode.nodeType === Node.ELEMENT_NODE && focusOffset !== 0) {
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focusNode = focusNode.childNodes[focusOffset - 1];
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caretOffset = focusNode.textContent.length;
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}
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function enterNodeCallback(node) {
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const nodeText = node.nodeType === Node.TEXT_NODE && node.nodeValue;
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if (!foundCaret) {
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if (node === focusNode) {
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foundCaret = true;
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}
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}
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if (nodeText) {
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if (!foundCaret) {
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caretOffset += nodeText.length;
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}
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text += nodeText;
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}
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}
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function leaveNodeCallback(node) {
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// if this is not the last DIV (which are only used as line containers atm)
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// we don't just check if there is a nextSibling because sometimes the caret ends up
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// after the last DIV and it creates a newline if you type then,
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// whereas you just want it to be appended to the current line
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if (node.tagName === "DIV" && node.nextSibling && node.nextSibling.tagName === "DIV") {
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text += "\n";
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if (!foundCaret) {
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caretOffset += 1;
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}
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}
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}
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walkDOMDepthFirst(editor, enterNodeCallback, leaveNodeCallback);
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const atNodeEnd = sel.focusOffset === sel.focusNode.textContent.length;
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const caret = {atNodeEnd, offset: caretOffset};
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return {caret, text};
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}
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