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鼠标中键单击时自动滚动JTextArea

[英]Auto scroll JTextArea on middle mouse button click

原文 2013-07-21 11:47:30 2 1 java/ swing/ jtextarea

How to auto scroll JTextArea on middle mouse button click? 如何在鼠标中键单击时自动滚动JTextArea ？ To be clear, when we click the mouse wheel (middle button) in Firefox (for example) and push it down/up we will be able to scroll the page automatically when we release the middle button, we can alo see a round icon at the point of middle button click. 明确地说，当我们在Firefox中单击鼠标滚轮（中间按钮）（例如）并向下/向上推时，我们将能够在释放中间按钮时自动滚动页面，我们还可以在看到一个圆形图标单击中间按钮的点。

Here is a screenshot of it. 这是它的屏幕截图。

自动滚动JTextArea图标

I think there is no such functionality for JTextArea in Java. 我认为Java中的JTextArea没有这种功能。 Is there any hack to implement it. 是否有实现它的技巧。

Any answer is appreciated. 任何答案表示赞赏。

1 个解决方案

To determine which of the Mouse buttons is pressed, these three methods from SwingUtilities could help you: 要确定按下了哪个鼠标按钮， SwingUtilities以下三种方法可以帮助您：

isLeftMouseButton isLeftMouseButton

isMiddleMouseButton isMiddleMouseButton

isRightMouseButton isRightMouseButton

Based on the mouse button clicked, you can take appropriate action to scroll the JTextArea programmatically. 基于单击的鼠标按钮，您可以采取适当的措施以编程方式滚动JTextArea。 Probably, you can use something like this: 可能，您可以使用如下所示的内容：

textArea.setCaretPosition(textArea.getDocument().getLength()); -> to move to the end of the JTextArea ->移至JTextArea的末尾

You can look at this link to get a good idea of positioning the cursor position in JTextArea 您可以查看此链接，以获得在JTextArea中定位光标位置的好主意。