Question

我设法将我的示例简化为以下内容（它使用了一些相当大的数据URL，但stackoverflow应该很好地将它们从侧面流出......）：

static
{
    String oldValue = System.getProperty("java.protocol.handler.pkgs");
    if (oldValue == null)
    {
        System.setProperty("java.protocol.handler.pkgs", "org.xhtmlrenderer.protocols");
    }
    else if (!oldValue.contains("org.xhtmlrenderer.protocols"))
    {
        System.setProperty("java.protocol.handler.pkgs", oldValue + "|org.xhtmlrenderer.protocols");
    }
}

@Test
public void testLegacyCellSpacing() throws Exception
{
    ITextRenderer renderer = new ITextRenderer();

    renderer.setDocumentFromString("<html>\n" +
                                   "  <head>\n" +
                                   "    <title>Some title</title>\n" +
                                   "  </head>\n" +
                                   "  <body>\n" +
                                   "    <div>\n" +
                                   "<table cellpadding=\"0\" cellspacing=\"0\">\n" +
                                   "<tr>\n" +
                                   "<td>\n" +
                                   "   <img src=\"data:image/png;base64,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\" width=\"185\" height=\"83\"/>\n" +
                                   "</td>\n" +
                                   "</tr>\n" +
                                   "<tr>\n" +
                                   "<td>\n" +
                                   "   <img src=\"data:image/png;base64,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\" width=\"185\" height=\"84\"/>\n" +
                                   "</td>\n" +
                                   "</tr>\n" +
                                   "<tr>\n" +
                                   "<td>\n" +
                                   "   <img src=\"data:image/png;base64,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\" width=\"185\" height=\"83\"/>\n" +
                                   "</td>\n" +
                                   "</tr>\n" +
                                   "</table>\n" +
                                   "    </div>\n" +
                                   "  </body>\n" +
                                   "</html>", null);

    renderer.layout();

    File pdfFile = File.createTempFile("TestFlyingSaucer", ".pdf");
    OutputStream output = new BufferedOutputStream(new FileOutputStream(pdfFile));
    try
    {
        renderer.createPDF(output, true);
    }
    finally
    {
        output.close();
    }

    System.out.println(); // breakpointing here to look at the output.  no good assertions available for checking this problem yet. :(
}

此代码运行，并生成PDF，每个图像之间的空格不正确。我无法弄清楚造成这些空间的原因，但我无法弄清楚它是否也是一个错误。我所知道的：

Web浏览器不会在图像之间显示空格。
如果您移除图像并将其替换为类似固定大小的div，则问题会神奇地消失（这证明飞碟正在使用传统的cellpadding和cellspacing属性做正确的事情，这是我最初的担忧。）
如果向单元格（td { border: 1px solid red; }）添加1像素边框，则表明额外空间位于td元素之外。
如果删除<td>和<img之间的空格，问题就会消失。

对我来说，在元素内部额外的空间可能会导致在元素之外的额外填充/边距似乎很奇怪。也许我完全误解了HTML，所以我希望有人会在我将这个问题塞进他们的跟踪器之前让我直截了当。

（另外：抢占典型的膝盖反射“不要使用表格” - 这不是我的HTML，我试图在清理后将真实世界的HTML渲染为PDF。这个例子显示了帖子-cleanup HTML来排除清理代码中的问题。）

Answer 1

浏览器在许多地方对HTML中的空白区域很敏感，包括内部和内部元素，甚至在您不期望的地方。例如，如果您有ul个li元素，如果您使用CSS为li {display:inline}项设置样式以制作水平菜单，</li>和<li>之间的任何空格下一个{{1}}会将菜单项分开！

在这种特殊情况下，看到缩小第一个子元素的空白区域肯定是不寻常的，但我不能断言是否会根据HTML标准将其视为错误。您最好的解决方案就是在问题出现时简单地消除空白区域。

飞碟对细胞图像的处理是一个错误吗？

1 个答案: