r - 在 R Markdown 中创建可填充的彩色文本框 (PDF)

Question

我正在尝试创建一个 Markdown ，其中图表和表格附带的文本位于深蓝色框中，如下图所示:

我尝试查看 this solution ，但我根本无法复制这个盒子，当然也不能复制彩色版本。有人知道如何在 Markdown 中做到这一点吗？

---
title: "Untitled"
author: "Test"
date: "22/6/2018"
output: pdf_document
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

## R Markdown

This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see <http://rmarkdown.rstudio.com>.

When you click the **Knit** button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:

```{r cars}
summary(cars)
```

## Including Plots

You can also embed plots, for example:

```{r pressure, echo=FALSE}
plot(pressure)
```

Note that the `echo = FALSE` parameter was added to the code chunk to prevent printing of the R code that generated the plot.

\begin{Form}
    \TextField[width = 10cm, height = 10cm]{This is the textbox.}
    I would like a dark blue textbox with white writing
\end{Form}

Answer 1

\TextField 命令采用一些可选参数来定义颜色和默认文本:

---
output: 
  pdf_document:
    keep_tex: yes
---

\begin{Form}
    \TextField[width = 10cm,%
               height = 3cm,%
               multiline=true,%
               bordercolor = 0 0 0.5,%
               backgroundcolor = 0 0 0.5,%
               color = 1 1 1,%
               value = {%
                          This is the textbox.
                          I would like a dark blue textbox with white writing
                        }%
               ]{}
\end{Form}

这会产生:

可以编辑 \TextField 以包含多行文本，但我无法设置多行值。使用 \string\n (参见 https://tex.stackexchange.com/questions/416218/how-to-add-line-breaks-to-hyperref-pdf-form-textfield )对我不起作用。不过，这可能取决于 PDF 查看器。我正在使用 Evince。