java - 调整 JPanel 大小

Question

我有一个关于调整 JPanel 大小的问题。

我有一个 JSlider，它可以动态调整 JPanel 的大小。当我更改JPanel的值Height()时，面板的大小从上到下减小或增大，效果与窗帘一样，但是当我更改值 Width() 时，它不会影响 curtain，面板从中心调整大小，并同时减小或增大两侧。

尊敬的专家，请告诉我如何从左到右或向后调整面板宽度？

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JToolBar;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;


public class Swipe extends JFrame {

    static JPanel panel = null;
    static JPanel panel2 = null;
    static JPanel panel3 = null;
    static JLabel label1 = null;
    static JLabel label2 = null;
    static JSlider slider = null;
    static JToolBar bar = null;
    ImageIcon img;

    public Swipe(ImageIcon img1, ImageIcon img2) {
        JFrame frame = new JFrame();
        bar = new JToolBar();
        bar.add(slider(img1));
        frame.add(bar, BorderLayout.NORTH);
        label1 = new JLabel();
        label1.setLayout(null);
        label1.setMaximumSize(new Dimension(img2.getIconWidth(), img2.getIconHeight()));
        label1.setIcon(img1);

        panel = new JPanel();
        panel.add(label1, new GridBagConstraints());

        label2 = new JLabel();
        label2.setPreferredSize(new Dimension(img2.getIconWidth(), img2.getIconHeight() + 20));
        label2.setMaximumSize(new Dimension(img2.getIconWidth(), img2.getIconHeight()));
        label2.setIcon(img2);
        frame.setLayout(new FlowLayout());
        label2.setLayout(new FlowLayout());
        label2.add(panel);
        frame.add(label2);
        frame.setSize(img2.getIconWidth() + 50, img2.getIconHeight() + 50);
        frame.setVisible(true);
        frame.pack();
    }

    public JSlider slider(final ImageIcon im) {
        slider = new JSlider();
        slider.setMaximum(im.getIconHeight());
        slider.addChangeListener(new ChangeListener() {
            @Override
            public void stateChanged(ChangeEvent e) {
                // TODO Auto-generated method stub
                int value = slider.getValue();
                //panel.setPreferredSize(new Dimension(im.getIconWidth(),value));
                panel.setPreferredSize(new Dimension(value, im.getIconHeight()));
                panel.repaint();
                panel.updateUI();
            }
        });
        return slider;
    }
}

Answer 1

虽然肯定可以按照您的方式进行，但它更简单、更容易使用 JSplitPane实现我认为类似的目标:

new JSplitPane(JSplitPane.VERTICAL_SPLIT, 
  componentOnLeft, Component componentOnRight);

JSplitPane 还具有 setDividerLocation方法(一种绝对，一种比例)如果您需要以编程方式调整两个组件的大小。