固定宽度的JScrollPane

Question

我是Java Swing的新手，我对下一个代码感到困惑。

private void initialize() {
    frame = new JFrame();
    frame.setBounds(100, 100, 616, 374);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().setLayout(new BorderLayout(0, 0));

    JScrollPane scrollPane = new JScrollPane();
    scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
    frame.getContentPane().add(scrollPane);

    JPanel panel = new JPanel();
    scrollPane.setViewportView(panel);
    SpringLayout sl_panel = new SpringLayout();
    panel.setLayout(sl_panel);

    JTextPane leftTextPane = new JTextPane();
    sl_panel.putConstraint(SpringLayout.NORTH, leftTextPane, 10, SpringLayout.NORTH, panel);
    sl_panel.putConstraint(SpringLayout.WEST, leftTextPane, 10, SpringLayout.WEST, panel);
    panel.add(leftTextPane);

    JTextPane rightTextPane = new JTextPane();
    sl_panel.putConstraint(SpringLayout.NORTH, rightTextPane, 10, SpringLayout.NORTH, panel);
    sl_panel.putConstraint(SpringLayout.WEST, rightTextPane, 10, SpringLayout.EAST, leftTextPane);
    sl_panel.putConstraint(SpringLayout.EAST, rightTextPane, -10, SpringLayout.EAST, panel);
    panel.add(rightTextPane);

    scrollPane.addComponentListener(new ComponentAdapter() 
    {
        public void componentResized(ComponentEvent evt) {
            sl_panel.putConstraint(SpringLayout.EAST, leftTextPane, (int)(scrollPane.getWidth() * 0.7), SpringLayout.WEST, (Component)(evt.getSource()));
        }
    });
}

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Answer 1

问题是一个scrollpane会以其首选大小显示一个组件，然后根据需要添加滚动条。

在您的情况下，您希望宽度由ScrollPane的视口来约束。

因此，您需要在添加到视口的组件上实现scrollable接口。scrollable界面将允许您强制组件宽度与视口的宽度匹配，这反过来将限制每个JTextPane的宽度，从而导致文本换行。

ScrollablePanel panel = new ScrollablePanel( new BorderLayout());
panel.setScrollableWidth( ScrollablePanel.ScrollableSizeHint.FIT );

JSplitPane splitPane = new JSplitPane();
splitPane.setLeftComponent(new JTextPane());
splitPane.setRightComponent(new JTextPane());
splitPane.setResizeWeight(0.7);
splitPane.setDividerLocation(.7);

然后只需将所有内容添加到框架中：

panel.add(splitPane);
frame.add(new JScrollPane(panel), BorderLayout.CENTER);

现在分割器的位置将保持在70%，文本窗格将随着框架大小的调整而增长/缩小。