Java Swing-使用 JScrollPane 并让它滚动回顶部

我使用 JScrollPane 允许在一个具有文本组件的 JFrame 中进行滚动，该组件用作文本编辑器。在这个编辑器中设置文本之后，我想要做的是让它滚动回顶部，这样您就可以看到文件开头的内容。

有人知道怎么做吗？

java
swing

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Use JComponent.scrollRectToVisible()

If you need more info, here's an article

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You can try this:

 scrollPane.getViewport().setViewPosition(new Point(0,0));

According to the JavaDocs setViewPosition() behaves like this:

Sets the view coordinates that appear in the upper left hand corner of the viewport, does nothing if there's no view.

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Calling setCaretPosition(0) on your text component will cause it to scroll to the top.

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Just in case you are not using a text component take a look at the thread posted here.... Setting Scroll Bar on a JScrollPane

Their solution is to spin off a thread via invokeLater

final JScrollPane scroll = new JScrollPane(text);
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
scroll.getVerticalScrollBar().setValue(0);
}
});

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This will make the work:

DefaultCaret caret = (DefaultCaret) textArea.getCaret();
caret.setUpdatePolicy(DefaultCaret.NEVER_UPDATE);

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You can use the method setCaretPosition(0) just after setText(String t) of your text component.

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Here's how:

textArea.setSelectionStart(0);
textArea.setSelectionEnd(0);