给 JTextArea 添加水印 [英] Adding a watermark to a JTextArea

问题描述

它们是一种将 水印 添加到 JTextArea?

Is they a way of adding a watermark to a JTextArea?

推荐答案

我怀疑您需要子类化 JTextArea 并覆盖 paintComponent() 方法，绘制首先你的背景图片并调用 super.paintComponent() 来渲染文本:

I suspect that you'd need to subclass JTextArea and override the paintComponent() method, drawing your background image first and calling super.paintComponent() to render the text:

public void paintComponent (Graphics g) {
    g.drawImage(watermark, 0, 0, this);
    super.paintComponent(g);
}

正如 camickr，一个 JTextArea 是不透明的，所以你的子类需要通过调用 setOpaque(false) 来改变它.

edit: as pointed out by camickr, a JTextArea is opaque, so your subclass will need to change this by calling setOpaque(false).

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