概述
本 Demo 展示了如何为单元格添加折角装饰效果。通过 style.decoration.cornerFold 属性，可以设置折角的大小、颜色和位置。Demo 中预设了多个单元格展示不同的折角效果，并提供了交互界面，允许用户动态修改选中单元格的折角样式。
实现思路
初始化工作表并填充示例数据（使用基础表格结构展示商品销售数据）
为多个单元格预设不同的折角样式，展示位置、大小和颜色的多样性
绑定交互事件，监听用户选择单元格和点击设置/重置按钮的操作
当用户选中单元格时，通过 getStyle() 获取现有样式并显示在界面上
用户修改折角属性后，通过 setStyle() 应用新的样式
代码解析
设置单元格折角装饰
这段代码展示了如何设置单个单元格的折角装饰。position 使用数值 1 表示左上角，这是 GC.Spread.Sheets.CornerPosition.leftTop 的枚举值。
动态设置折角位置
折角位置使用位运算组合，可以同时在多个角显示折角。例如，position = 15（1 + 2 + 4 + 8）表示四个角都显示折角。
运行效果
Demo 加载后，表格中预设了 5 个单元格展示不同的折角样式（红色、绿色、蓝色、黑色，位置和大小各异）
用户可以点击任意单元格选中它
在右侧面板中，可以修改折角的大小（数字输入框）、颜色（文本输入框）和位置（四个复选框对应四个角）
点击"设置"按钮应用修改，单元格会立即显示新的折角样式
点击"重置"按钮恢复选中单元格的原始折角设置
API 参考
cornerFold 属性
CornerPosition 枚举值
GC.Spread.Sheets.CornerPosition.leftTop = 1（左上角）
GC.Spread.Sheets.CornerPosition.rightTop = 2（右上角）
GC.Spread.Sheets.CornerPosition.leftBottom = 4（左下角）
GC.Spread.Sheets.CornerPosition.rightBottom = 8（右下角）
可以通过位运算组合多个位置，例如：
position: 3 表示同时在左上和右上显示折角
position: 15 表示四个角都显示折角
window.onload = function () {
let spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"), { sheetCount: 1 });
initSpread(spread);
};
function initSpread(spread) {
let sheet = spread.getSheet(0);
initSpreadData(sheet);
initSheet(sheet);
bindEvents(spread);
}
function initSheet (sheet) {
let style = sheet.getStyle(18, 4);
style.decoration = {
cornerFold: {
size: 8,
position: 1,
color: "red"
}
}
sheet.setStyle(18, 4, style);
style = sheet.getStyle(18, 6);
style.decoration = {
cornerFold: {
size: 10,
position: 2,
color: "green"
}
}
sheet.setStyle(18, 6, style);
style = sheet.getStyle(6, 10);
style.decoration = {
cornerFold: {
size: 15,
position: 4,
color: "blue"
}
}
sheet.setStyle(6, 10, style);
style = sheet.getStyle(12, 10);
style.decoration = {
cornerFold: {
size: 20,
position: 8,
color: "black"
}
}
sheet.setStyle(12, 10, style);
style = sheet.getStyle(18, 10);
style.decoration = {
cornerFold: {
size: 8,
position: 15,
color: "black"
}
}
sheet.setStyle(18, 10, style);
}
function initSpreadData(sheet) {
let spreadNS = GC.Spread.Sheets;
sheet.addSpan(1, 1, 1, 3);
sheet.setValue(1, 1, 'Store');
sheet.addSpan(1, 4, 1, 7);
sheet.setValue(1, 4, 'Goods');
sheet.addSpan(2, 1, 1, 2);
sheet.setValue(2, 1, 'Area');
sheet.addSpan(2, 3, 2, 1);
sheet.setValue(2, 3, 'ID');
sheet.addSpan(2, 4, 1, 2);
sheet.setValue(2, 4, 'Fruits');
sheet.addSpan(2, 6, 1, 2);
sheet.setValue(2, 6, 'Vegetables');
sheet.addSpan(2, 8, 1, 2);
sheet.setValue(2, 8, 'Foods');
sheet.addSpan(2, 10, 2, 1);
sheet.setValue(2, 10, 'Total');
sheet.setValue(3, 1, 'State');
sheet.setValue(3, 2, 'City');
sheet.setValue(3, 4, 'Grape');
sheet.setValue(3, 5, 'Apple');
sheet.setValue(3, 6, 'Potato');
sheet.setValue(3, 7, 'Tomato');
sheet.setValue(3, 8, 'SandWich');
sheet.setValue(3, 9, 'Hamburger');
sheet.addSpan(4, 1, 7, 1);
sheet.addSpan(4, 2, 3, 1);
sheet.addSpan(7, 2, 3, 1);
sheet.addSpan(10, 2, 1, 2);
sheet.setValue(10, 2, 'Sub Total:');
sheet.addSpan(11, 1, 7, 1);
sheet.addSpan(11, 2, 3, 1);
sheet.addSpan(14, 2, 3, 1);
sheet.addSpan(17, 2, 1, 2);
sheet.setValue(17, 2, 'Sub Total:');
sheet.addSpan(18, 1, 1, 3);
sheet.setValue(18, 1, 'Total:');
sheet.setValue(4, 1, 'NC');
sheet.setValue(4, 2, 'Raleigh');
sheet.setValue(7, 2, 'Charlotte');
sheet.setValue(4, 3, '001');
sheet.setValue(5, 3, '002');
sheet.setValue(6, 3, '003');
sheet.setValue(7, 3, '004');
sheet.setValue(8, 3, '005');
sheet.setValue(9, 3, '006');
sheet.setValue(11, 1, 'PA');
sheet.setValue(11, 2, 'Philadelphia');
sheet.setValue(14, 2, 'Pittsburgh');
sheet.setValue(11, 3, '007');
sheet.setValue(12, 3, '008');
sheet.setValue(13, 3, '009');
sheet.setValue(14, 3, '010');
sheet.setValue(15, 3, '011');
sheet.setValue(16, 3, '012');
sheet.setFormula(10, 4, '=SUM(E5:E10)');
sheet.setFormula(10, 5, '=SUM(F5:F10)');
sheet.setFormula(10, 6, '=SUM(G5:G10)');
sheet.setFormula(10, 7, '=SUM(H5:H10)');
sheet.setFormula(10, 8, '=SUM(I5:I10)');
sheet.setFormula(10, 9, '=SUM(J5:J10)');
sheet.setFormula(17, 4, '=SUM(E12:E17)');
sheet.setFormula(17, 5, '=SUM(F12:F17)');
sheet.setFormula(17, 6, '=SUM(G12:G17)');
sheet.setFormula(17, 7, '=SUM(H12:H17)');
sheet.setFormula(17, 8, '=SUM(I12:I17)');
sheet.setFormula(17, 9, '=SUM(J12:J17)');
for (let i = 0; i < 14; i++) {
sheet.setFormula(4 + i, 10, '=SUM(E' + (5 + i).toString() + ':J' + (5 + i).toString() + ')');
}
sheet.setFormula(18, 4, '=E11+E18');
sheet.setFormula(18, 5, '=F11+F18');
sheet.setFormula(18, 6, '=G11+G18');
sheet.setFormula(18, 7, '=H11+H18');
sheet.setFormula(18, 8, '=I11+I18');
sheet.setFormula(18, 9, '=J11+J18');
sheet.setFormula(18, 10, '=K11+K18');
sheet.getRange(1, 1, 3, 10).backColor('#D9D9FF');
sheet.getRange(4, 1, 15, 3).backColor('#D9FFD9');
sheet.getRange(1, 1, 3, 10).hAlign(spreadNS.HorizontalAlign.center);
sheet.getRange(1, 1, 18, 10).setBorder(new spreadNS.LineBorder('Black', spreadNS.LineStyle.thin), { all: true });
sheet.getRange(4, 4, 3, 6).setBorder(new spreadNS.LineBorder('Black', spreadNS.LineStyle.dotted), { inside: true });
sheet.getRange(7, 4, 3, 6).setBorder(new spreadNS.LineBorder('Black', spreadNS.LineStyle.dotted), { inside: true });
sheet
.getRange(11, 4, 3, 6)
.setBorder(new spreadNS.LineBorder('Black', spreadNS.LineStyle.dotted), { inside: true });
sheet
.getRange(14, 4, 3, 6)
.setBorder(new spreadNS.LineBorder('Black', spreadNS.LineStyle.dotted), { inside: true });
fillSampleData(sheet, new spreadNS.Range(4, 4, 6, 6));
fillSampleData(sheet, new spreadNS.Range(11, 4, 6, 6));
}
function fillSampleData(sheet, range) {
for (let i = 0; i < range.rowCount; i++) {
for (let j = 0; j < range.colCount; j++) {
sheet.setValue(range.row + i, range.col + j, Math.ceil(Math.random() * 300));
}
}
}
function bindEvents (spread) {
let sheet = spread.getSheet(0);
document.getElementById("set-corner").addEventListener('click', function () {
set(sheet);
sheet.repaint();
});
document.getElementById("reset-corner").addEventListener('click', function () {
reset(sheet);
sheet.repaint();
});
spread.bind(GC.Spread.Sheets.Events.SelectionChanged, function () {
reset(sheet);
sheet.repaint();
});
}
function reset (sheet) {
let activeRow = sheet.getActiveRowIndex();
let activeCol = sheet.getActiveColumnIndex();
let style = sheet.getStyle(activeRow, activeCol);
document.getElementById('leftTop').checked = false;
document.getElementById('leftBottom').checked = false;
document.getElementById('rightTop').checked = false;
document.getElementById('rightBottom').checked = false;
if (style && style.decoration && style.decoration.cornerFold) {
let cornerFold = style.decoration.cornerFold;
document.getElementById('size-corner').value = +cornerFold.size;
document.getElementById('color-corner').value = cornerFold.color;
if (cornerFold.position & 1) {
document.getElementById('leftTop').checked = true;
}
if (cornerFold.position & 2) {
document.getElementById('rightTop').checked = true;
}
if (cornerFold.position & 4) {
document.getElementById('leftBottom').checked = true;
}
if (cornerFold.position & 8) {
document.getElementById('rightBottom').checked = true;
}
} else {
document.getElementById('size-corner').value = 6;
document.getElementById('color-corner').value = null;
}
}
function set (sheet) {
let activeRow = sheet.getActiveRowIndex();
let activeCol = sheet.getActiveColumnIndex();
let style = sheet.getStyle(activeRow, activeCol);
if (!style) {
style = new GC.Spread.Sheets.Style();
}
let position = 0;
if (document.getElementById('leftTop').checked) {
position = position | 1;
}
if (document.getElementById('rightTop').checked) {
position = position | 2;
}
if (document.getElementById('leftBottom').checked) {
position = position | 4;
}
if (document.getElementById('rightBottom').checked) {
position = position | 8;
}
style.decoration = {
cornerFold: {
size: +document.getElementById('size-corner').value,
position: position,
color: document.getElementById('color-corner').value
}
}
sheet.setStyle(activeRow, activeCol, style);
}
<!doctype html>
<html style="height:100%;font-size:14px;">
<head>
<meta name="spreadjs culture" content="zh-cn" />
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" type="text/css"
href="$DEMOROOT$/zh/purejs/node_modules/@grapecity-software/spread-sheets/styles/gc.spread.sheets.excel2013white.css">
<script src="$DEMOROOT$/zh/purejs/node_modules/@grapecity-software/spread-sheets/dist/gc.spread.sheets.all.min.js"
type="text/javascript"></script>
<script
src="$DEMOROOT$/zh/purejs/node_modules/@grapecity-software/spread-sheets-resources-zh/dist/gc.spread.sheets.resources.zh.min.js"
type="text/javascript"></script>
<script src="$DEMOROOT$/spread/source/js/license.js" type="text/javascript"></script>
<script src="app.js" type="text/javascript"></script>
<link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>
<div class="sample-tutorial">
<div id="ss" class="sample-spreadsheets"></div>
<div class="options-container">
<p>尝试选择一个单元格，更改以下选项，然后点击“重置”按钮。</p>
<div class="corner-pro">
<label for="size-corner">角标大小:</label><input type="number" id="size-corner" class="corner-input"
placeholder="角标大小" value="6">
</div>
<div class="corner-pro">
<label for="color-corner">角标颜色:</label><input type="text" id="color-corner" class="corner-input"
placeholder="角标颜色">
</div>
<div class="corner-pro">
<label for="position-corner">左上位置:</label><input type="checkbox" class="corner-input"
id="leftTop">
</div>
<div class="corner-pro">
<label for="position-corner">右上位置:</label><input type="checkbox" class="corner-input"
id="rightTop">
</div>
<div class="corner-pro">
<label for="position-corner">左下位置:</label><input type="checkbox" class="corner-input"
id="leftBottom">
</div>
<div class="corner-pro">
<label for="position-corner">右下位置:</label><input type="checkbox" class="corner-input"
id="rightBottom">
</div>
<div class="corner-pro">
<button id="set-corner" class="corner-btn">设置</button>
<button id="reset-corner" class="corner-btn">重置</button>
</div>
</div>
</div>
</body>
</html>
.sample-tutorial {
position: relative;
height: 100%;
overflow: hidden;
}
.sample-spreadsheets {
width: calc(100% - 280px);
height: 100%;
overflow: hidden;
float: left;
}
.options-container {
float: right;
width: 280px;
padding: 12px;
height: 100%;
box-sizing: border-box;
background: #fbfbfb;
overflow: auto;
}
body {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
label {
display: inline-block;
width: 135px;
}
.corner-pro {
width: 100%;
height: 30px;
font-size: 13px;
}
#size-corner, #color-corner {
display: inline-block;
width: 100px;
}
.corner-btn {
display: inline-block;
width: 100px;
height: 30px;
margin-left: 20px;
}
