填充设置

颜色和背景图案

Microsoft Excel可以设置单元格的前景(轮廓)和背景(填充)颜色以及背景图案。

Aspose.Cells还以灵活的方式支持这些功能。在本主题中,我们将学习如何使用Aspose.Cells来使用这些功能。

设置颜色和背景图案

Aspose.Cells 提供一个类 Workbook 来表示一个 Microsoft Excel 文件。Workbook 类包含一个 worksheets 集合,可访问 Excel 文件中的每个工作表。工作表由 Worksheet 类表示。Worksheet 类提供一个 cells 集合。cells 集合中的每一项代表一个 Cell 类的对象。

Cell具有style属性,用于获取和设置单元格的格式。Style类提供了设置单元格前景色和背景色的属性。Aspose.Cells提供了包含预定义背景图案类型的BackgroundType枚举,具体如下。

背景图案 描述
DiagonalCrosshatch 代表对角线交叉图案
DiagonalStripe 代表对角线条纹图案
Gray6 代表6.25%灰色图案
Gray12 代表12.5%灰色图案
Gray25 代表25%灰色图案
Gray50 代表50%灰色图案
Gray75 代表75%灰色图案
HorizontalStripe 代表水平条纹图案
None 代表无背景
ReverseDiagonalStripe 代表反对角线条纹图案
Solid 代表实线图案
ThickDiagonalCrosshatch 代表粗对角线交叉图案
ThinDiagonalCrosshatch 代表细对角线交叉图案
ThinDiagonalStripe 代表细对角线条纹图案
ThinHorizontalCrosshatch 代表细水平交叉图案
ThinHorizontalStripe 代表细水平条纹图案
ThinReverseDiagonalStripe 代表细反对角线条纹图案
ThinVerticalStripe 代表细竖条纹图案
VerticalStripe 代表竖条纹图案

在下面的示例中,A1单元格的前景色已设置,但A2配置为具有前景色和背景色的垂直条纹背景模式。

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Example Title</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat } = AsposeCells;

        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            // Instantiating a Workbook object
            const workbook = new Workbook();

            // Adding a new worksheet to the Workbook object
            const i = workbook.worksheets.add();

            // Obtaining the reference of the newly added worksheet by passing its sheet index
            const worksheet = workbook.worksheets.get(i);

            // Define a Style and get the A1 cell style
            let style = worksheet.cells.get("A1").style;

            // Setting the foreground color to yellow
            style.foregroundColor = AsposeCells.Color.Yellow;

            // Setting the background pattern to vertical stripe
            style.pattern = AsposeCells.BackgroundType.VerticalStripe;

            // Apply the style to A1 cell
            worksheet.cells.get("A1").style = style;

            // Get the A2 cell style
            style = worksheet.cells.get("A2").style;

            // Setting the foreground color to blue
            style.foregroundColor = AsposeCells.Color.Blue;

            // Setting the background color to yellow
            style.backgroundColor = AsposeCells.Color.Yellow;

            // Setting the background pattern to vertical stripe
            style.pattern = AsposeCells.BackgroundType.VerticalStripe;

            // Apply the style to A2 cell
            worksheet.cells.get("A2").style = style;

            // Saving the Excel file
            const outputData = workbook.save(SaveFormat.Excel97To2003);
            const blob = new Blob([outputData]);
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'book1.out.xls';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Excel File';

            document.getElementById('result').innerHTML = '<p style="color: green;">Workbook created and ready for download.</p>';
        });
    </script>
</html>

重要知识

应用梯度填充效果

要将所需的渐变填充效果应用到单元格中,请相应地使用 Style 对象的 twoColorGradient 属性。

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Aspose.Cells Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat, Color, GradientStyleType, TextAlignmentType } = AsposeCells;

        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            const fileInput = document.getElementById('fileInput');

            let workbook;
            if (fileInput.files.length) {
                const file = fileInput.files[0];
                const arrayBuffer = await file.arrayBuffer();
                workbook = new Workbook(new Uint8Array(arrayBuffer));
            } else {
                workbook = new Workbook();
            }

            const worksheet = workbook.worksheets.get(0);

            worksheet.cells.get(2, 1).putValue("test");

            const style = worksheet.cells.get("B3").style;

            style.isGradient = true;
            style.twoColorGradient = [ new Color(255, 255, 255), new Color(79, 129, 189), GradientStyleType.Horizontal, 1 ];
            style.font.color = Color.Red;
            style.horizontalAlignment = TextAlignmentType.Center;
            style.verticalAlignment = TextAlignmentType.Center;

            worksheet.cells.get("B3").style = style;

            worksheet.cells.rowHeightPixel = [2, 53];

            worksheet.cells.merge(2, 1, 1, 2);

            const outputData = workbook.save(SaveFormat.Xlsx);
            const blob = new Blob([outputData]);
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'output.xlsx';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Excel File';

            document.getElementById('result').innerHTML = '<p style="color: green;">Operation completed successfully! Click the download link to get the modified file.</p>';
        });
    </script>
</html>

颜色和调色板

调色板是在创建图像时可用的颜色数量。在演示文稿中使用标准调色板可以让用户创建一致的外观。每个Microsoft Excel(97-2003)文件都有一个包含可应用于单元格、字体、网格线、图形对象、填充和图表中的线条的56种颜色的调色板。

使用 Aspose.Cells 不仅可以使用调色板的现有颜色,还可以使用自定义颜色。在使用自定义颜色之前,首先将其添加到调色板中。

本主题讨论如何向调色板中添加自定义颜色。

向调色板中添加自定义颜色

Aspose.Cells 支持 Microsoft Excel 的 56 种颜色调色板。要使用在调色板中未定义的自定义颜色,需要将颜色添加到调色板中。

Aspose.Cells 提供一个类 Workbook,代表一个 Microsoft Excel 文件。Workbook 类提供一个 changePalette 方法,接受以下参数以添加自定义颜色以修改调色板:

  • Custom Color,要添加的自定义颜色。
  • Index,自定义颜色在调色板中的索引,将替换指定的颜色。应该在 0-55 之间。

下面的示例在应用于字体之前向调色板中添加了自定义颜色(兰花紫)。

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Example Title</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat, Worksheet, Cell } = AsposeCells;

        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            const fileInput = document.getElementById('fileInput');
            if (!fileInput.files.length) {
                document.getElementById('result').innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
                return;
            }

            const file = fileInput.files[0];
            const arrayBuffer = await file.arrayBuffer();

            // Instantiating a Workbook object by opening the Excel file from the uploaded file
            const workbook = new Workbook(new Uint8Array(arrayBuffer));

            // Checks if a color is in the palette for the spreadsheet.
            console.log(workbook.isColorInPalette(AsposeCells.Color.Orchid));

            // Adding Orchid color to the palette at 55th index
            workbook.changePalette(AsposeCells.Color.Orchid, 55);

            console.log(workbook.isColorInPalette(AsposeCells.Color.Orchid));

            // Adding a new worksheet to the Excel object
            const i = workbook.worksheets.add();

            // Obtaining the reference of the newly added worksheet by passing its sheet index
            const worksheet = workbook.worksheets.get(i);

            // Accessing the "A1" cell from the worksheet
            const cell = worksheet.cells.get("A1");

            // Adding some value to the "A1" cell
            cell.putValue("Hello Aspose!");

            // Defining new Style object
            const styleObject = workbook.createStyle();
            // Setting the Orchid (custom) color to the font
            styleObject.font.color = workbook.colors[55];

            // Applying the style to the cell
            cell.style = styleObject;

            // Saving the Excel file
            const outputData = workbook.save(SaveFormat.Xlsx);
            const blob = new Blob([outputData]);
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'out.xlsx';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Result';

            document.getElementById('result').innerHTML = '<p style="color: green;">Operation completed successfully! Click the download link to get the modified file.</p>';
        });
    </script>
</html>