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comment-ot.html
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comment-ot.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>comment-ot</title>
<link href="https://cdn.quilljs.com/1.3.6/quill.snow.css" rel="stylesheet" />
<style>
body,
html {
background-color: #eee;
font-size: 14px;
}
.editor-container {
margin: 0 auto;
width: 700px;
background-color: #fff;
}
.editor-container > .ql-toolbar {
border: unset;
border-bottom: 1px solid #eee;
}
#editor {
background-color: #fff;
border: unset;
}
.apply-comment {
width: auto !important;
}
</style>
</head>
<body>
<div id="root">
<div class="editor-container">
<div id="toolbar" style="display: none">
<select class="ql-header"></select>
<button class="ql-bold"></button>
<button class="ql-italic"></button>
<button class="ql-underline"></button>
<button class="apply-comment">评论</button>
</div>
<div id="editor"></div>
</div>
</div>
<script src="https://cdn.quilljs.com/1.3.6/quill.js"></script>
<script>
const dom = document.getElementById("editor");
const toolbar = document.getElementById("toolbar");
const editor = new Quill(dom, {
modules: {
toolbar: toolbar,
},
placeholder: "Enter Text...",
theme: "snow",
});
toolbar.style.display = "block";
window.editor = editor;
editor.setContents([
{ insert: "为了演示实际效果，此处的评论是使用虚拟图层的方式实现的。" },
{ insert: "\n" },
]);
</script>
<script>
const commentRangeDOM = document.createElement("div");
commentRangeDOM.className = "ql-range ignore-dom layer-comment";
editor.container.appendChild(commentRangeDOM);
const buildLayerDOM = ranges => {
commentRangeDOM.innerText = "";
const color = "rgb(255, 125, 0, 0.3)";
ranges.forEach(range => {
const startRect = editor.getBounds(range.index, 0);
const endRect = editor.getBounds(range.index + range.length, 0);
const block = document.createElement("div");
block.style.position = "absolute";
block.style.width = "100%";
block.style.height = "0";
block.style.top = startRect.top + "px";
block.style.pointerEvents = "none";
const head = document.createElement("div");
const body = document.createElement("div");
const tail = document.createElement("div");
if (startRect.top === endRect.top) {
head.style.marginLeft = startRect.left + "px";
head.style.height = startRect.height + "px";
head.style.width = endRect.right - startRect.left + "px";
head.style.backgroundColor = color;
} else if (endRect.top - startRect.bottom < startRect.height) {
head.style.marginLeft = startRect.left + "px";
head.style.height = startRect.height + "px";
head.style.width = startRect.width - startRect.left + "px";
head.style.backgroundColor = color;
body.style.height = endRect.top - startRect.bottom + "px";
tail.style.width = endRect.right + "px";
tail.style.height = endRect.height + "px";
tail.style.backgroundColor = color;
} else {
head.style.marginLeft = startRect.left + "px";
head.style.height = startRect.height + "px";
head.style.width = startRect.width - startRect.left + "px";
head.style.backgroundColor = color;
body.style.width = "100%";
body.style.height = endRect.top - startRect.bottom + "px";
body.style.backgroundColor = color;
tail.style.marginLeft = 0;
tail.style.height = endRect.height + "px";
tail.style.width = endRect.right + "px";
tail.style.backgroundColor = color;
}
block.appendChild(head);
block.appendChild(body);
block.appendChild(tail);
commentRangeDOM.appendChild(block);
});
};
editor.renderLayer = (origin, ignoreLineMarker = true) => {
/** @type {{start: number, length: number}} */
const lines = [];
let currentIndex = 0;
editor.scroll.lines().forEach(line => {
const length = line.length();
lines.push({ start: currentIndex, length });
currentIndex = currentIndex + length;
});
const ranges = [];
for (const item of origin) {
const { index, length } = item;
let traceLength = length;
for (const line of lines) {
if (length === 1 && index + length === line.start + line.length) {
if (ignoreLineMarker) break;
const payload = { index: line.start, length: line.length - 1 };
!ignoreLineMarker && payload.length > 0 && ranges.push(payload);
break;
}
if (index < line.start + line.length && line.start <= index + traceLength) {
const nextIndex = Math.max(line.start, index);
const nextLength = Math.min(
traceLength,
line.length - 1,
line.start + line.length - nextIndex
);
traceLength = traceLength - nextLength;
const payload = { index: nextIndex, length: nextLength };
if (nextIndex + nextLength === line.start + line.length) {
payload.length--;
}
payload.length > 0 && ranges.push(payload);
} else if (line.start > index + length || traceLength <= 0) {
break;
}
}
}
buildLayerDOM(ranges);
return ranges;
};
</script>
<script>
const COMMENT_LIST = [
{ index: 12, length: 2 },
{ index: 17, length: 4 },
];
editor.renderLayer(COMMENT_LIST);
const applyComment = document.querySelector(".apply-comment");
applyComment.onmousedown = e => {
e.stopPropagation();
e.preventDefault();
};
applyComment.onclick = e => {
const selection = editor.getSelection();
if (selection) {
const sel = { ...selection };
console.log("添加评论:", sel);
COMMENT_LIST.push(sel);
editor.renderLayer(COMMENT_LIST);
editor.setSelection(sel.index + sel.length);
}
};
const Delta = Quill.import("delta");
editor.on("text-change", delta => {
for(const item of COMMENT_LIST){
const { index, length } = item;
const start = delta.transformPosition(index);
const end = delta.transformPosition(index + length, true);
item.index = start;
item.length = end - start;
}
editor.renderLayer(COMMENT_LIST);
});
</script>
</body>
</html>