Question

任务：使用BoxLayout将一些带有一些文本的JLabel添加到JPanel，然后将此面板添加到JScrollPane以向下滚动该文本标签。

问题：

我设置 text.setMaximumSize（..），但JScrollPane不这么认为并添加水平滚动条。 text.setPreferredSize 限制完美，但我无法使用它，因为需要计算每个标签的高度（可能使用字体大小并获得标签自动断路器），这对我来说很难。

这是代码：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

public class NewPanel {

    private JFrame frame;
    private JLabel text;

    public NewPanel() {
        int formWidth = 700;
        int formHeight = 700;

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 100; i++)
            sb.append("Test String ");
        String resStr = "<html>" + sb.toString() + "</html>";

        text = new JLabel();
        text.setText(resStr);

        JPanel panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
        panel.add(text);

        JScrollPane scrollPane = new JScrollPane(
                panel,
                JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED
        );

        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.setPreferredSize(new Dimension(formWidth, formHeight));
        frame.add(scrollPane);
        frame.pack();

        //Change max width for label with form resize
        frame.addComponentListener(new ComponentAdapter() {
            @Override
            public void componentResized(ComponentEvent e) {
                super.componentResized(e);
                resizePanels();
            }

            @Override
            public void componentMoved(ComponentEvent e) {
                super.componentMoved(e);
                resizePanels();
            }
        });

        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private void resizePanels() {
        int labelSize = frame.getWidth() - 200;
            // - 200 For show that text limited by setMaximumSize

        text.setMaximumSize(new Dimension(labelSize, Integer.MAX_VALUE));
            //Integer.MAX_VALUE - for unlimited height (maybe exist better way?)

        //text.setPreferredSize(new Dimension(labelSize, 1000));
            //limit perfect and hide horizontal scroll, but don't think that it better way
            //because i need get plane border "back to back" text border,
            //so i must count label height (front height + maybe label auto line break place)
            //that look like hard way
        text.revalidate();
        text.repaint();
    }
}

使用setMaximumSize

0 个答案: