如何引入具有背景色的圆形细胞? [英] How to introduce rounded cells with a background color?

问题描述

在此问题中，我已经看到如何为表格单元格设置圆角边框

I have seen how to set rounded borders for a table cell in this question

如何使用iText创建圆角表\ iTextSharp?

但是有可能使单元格没有边界，而是彩色和圆形的背景吗?

But is it possible to make cell that will have no borders, but colored and rounded background?

推荐答案

要实现此目的，您需要 calendar.pdf :

To achieve that, you need cell events. I've provided different examples in my book. See for instance calendar.pdf:

用于创建白细胞的Java代码如下:

The Java code to create the white cells looks like this:

class CellBackground implements PdfPCellEvent {

    public void cellLayout(PdfPCell cell, Rectangle rect,
            PdfContentByte[] canvas) {
        PdfContentByte cb = canvas[PdfPTable.BACKGROUNDCANVAS];
        cb.roundRectangle(
            rect.getLeft() + 1.5f, rect.getBottom() + 1.5f, rect.getWidth() - 3,
            rect.getHeight() - 3, 4);
        cb.setCMYKColorFill(0x00, 0x00, 0x00, 0x00);
        cb.fill();
    }
}

对于此代码的C#版本，请转到在哪里可以找到C#示例?，然后单击与示例的Java版本的章节相对应的章节.

For the C# version of this code, go to Where do I find the C# examples? and click on the chapter that corresponds with the chapter of the Java version of the example.

例如， PdfCalendar.cs :

class CellBackground : IPdfPCellEvent {
  public void CellLayout(
    PdfPCell cell, Rectangle rect, PdfContentByte[] canvas
) {
    PdfContentByte cb = canvas[PdfPTable.BACKGROUNDCANVAS];
    cb.RoundRectangle(
      rect.Left + 1.5f, 
      rect.Bottom + 1.5f, 
      rect.Width - 3,
      rect.Height - 3, 4
    );
    cb.SetCMYKColorFill(0x00, 0x00, 0x00, 0x00);
    cb.Fill();
  }
}

您可以像这样使用此事件:

You can use this event like this:

CellBackground cellBackground = new CellBackground();
cell.CellEvent = cellBackground;

现在，将在单元格呈现到页面的那一刻执行CellLayout()方法.

Now the CellLayout() method will be executed the moment the cell is rendered to a page.

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