Java滚动JScrollPane，JPanel位于底部
我有一个JScrollPane，里面有一个非常高的JPanel，可以动态更改，并在其末尾附加项目。我想要的是滚动到上述JScrollPane的底部，以便新添加的项在添加后立即可见（它们不是直接附加到滚动窗格，而是附加到其JPanel，并且是私有对象，因此不能参考。
如何简单地使滚动窗格滚动到最底部？
提前致谢！
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疮痪徘弦漏
。在“ 1”实例上调用它。 例如。import java.awt.*; import java.awt.event.*; import javax.swing.*; class ScrollToNewLabel { public static void main(String[] args) { SwingUtilities.invokeLater( new Runnable() { public void run() { JPanel gui = new JPanel(new BorderLayout(3,3)); final JPanel panel = new JPanel(new GridLayout(0,1)); JScrollPane scroll = new JScrollPane(panel); scroll.setPreferredSize(new Dimension(80,100)); gui.add(scroll, BorderLayout.CENTER); JButton addLabel = new JButton(\"Add Label\"); gui.add(addLabel, BorderLayout.NORTH); ActionListener listener = new ActionListener() { int counter = 0; public void actionPerformed(ActionEvent ae) { panel.add(new JLabel(\"Label \" + ++counter)); panel.revalidate(); int height = (int)panel.getPreferredSize().getHeight(); Rectangle rect = new Rectangle(0,height,10,10); panel.scrollRectToVisible(rect); } }; addLabel.addActionListener(listener); JOptionPane.showMessageDialog(null, gui); } }); } }.。其中“ 5”是面板的首选高度，以像素为单位。import java.awt.*; import java.awt.event.*; import javax.swing.*; class ScrollToNewLabel { public static void main(String[] args) { SwingUtilities.invokeLater( new Runnable() { public void run() { JPanel gui = new JPanel(new BorderLayout(3,3)); final JPanel panel = new JPanel(new GridLayout(0,1)); final JScrollPane scroll = new JScrollPane(panel); scroll.setPreferredSize(new Dimension(80,100)); gui.add(scroll, BorderLayout.CENTER); JButton addLabel = new JButton(\"Add Label\"); gui.add(addLabel, BorderLayout.NORTH); ActionListener listener = new ActionListener() { int counter = 0; public void actionPerformed(ActionEvent ae) { panel.add(new JLabel(\"Label \" + ++counter)); panel.revalidate(); int height = (int)panel.getPreferredSize().getHeight(); scroll.getVerticalScrollBar().setValue(height); } }; addLabel.addActionListener(listener); JOptionPane.showMessageDialog(null, gui); } }); } }街茬
蕉衫
这使它移到视口的底部。您可以在将组件添加到面板后添加它。娜拐赐巫潭
/** * Scrolls a {@code scrollPane} to its bottom. * * @param scrollPane * the scrollPane that we want to scroll all the way down * */ private void scrollDown(JScrollPane scrollPane) { JScrollBar verticalBar = scrollPane.getVerticalScrollBar(); int currentScrollValue = verticalBar.getValue(); int previousScrollValue = -1; while (currentScrollValue != previousScrollValue) { // Scroll down a bit int downDirection = 1; int amountToScroll = verticalBar.getUnitIncrement(downDirection); verticalBar.setValue(currentScrollValue + amountToScroll); previousScrollValue = currentScrollValue; currentScrollValue = verticalBar.getValue(); } }