在JLayeredPane中分层JLabel

Question

我已经认真地尝试了我所能想到的关于如何使用JLayeredPane的所有内容，而我所做的一切似乎都没有用。首先，我创建了ImageIcons，然后将ImageIcons添加到JLabels，然后我将JLabel添加到JLayeredPane，然后添加{ {1}}到JLayeredPane。我尝试使用JPanel，setSize方法以及我可以找到的任何其他方法来调整setBounds的大小，然后再将它们添加到JLabels中，我永远无法获得我要显示的图像，更不用说层层叠叠了。我该如何完成这个？

这是我的代码：

JLayeredPane

所有public Class FaceLayout extends JFrame { public FaceLayout() { ImageIcon face = new ImageIcon(getClass().getResource("Imported Image"); ImageIcon eyes = new ImageIcon(getClass().getResource("Imported Image"); ImageIcon nose = new ImageIcon(getClass().getResource("Imported Image"); ImageIcon mouth = new ImageIcon(getClass().getResource("Imported Image"); JLabel fLab = new JLabel(face); fLab1.setBounds(25, 25, 50, 50); JLabel eLab = new JLabel(eyes); eLab1.setBounds(25, 25, 50, 50); JLabel nLab = new JLabel(nose); nLab1.setBounds(25, 25, 50, 50); JLabel mLab = new JLabel(mouth); mLab1.setBounds(25, 25, 50, 50); JCheckBox eBox = new JCheckBox("Eyes", false); JCheckBox nBox = new JCheckBox("Nose", false); JCheckBox mBox = new JCheckBox("Mouth", false); JButton submit = new JButton("Submit"); JPanel leftPanel = new JPanel(new GridLayout(4, 1)); leftPanel.add(eBox); leftPanel.add(nBox); leftPanel.add(mBox); leftPanel.add(submit); JLayeredPane layers = new JLayeredPane(); // Here I have tried the setLayer method and just adding them to the layeredPane itself. Right now I have it as: layers.add(fLab, new Integer(1)); layers.add(eLab, new Integer(2)); layers.add(nLab, new Integer(3)); layers.add(mLab, new Integer(4)); JPanel rightPanel = new JPanel(); rightPanel.add(layers); JSplitPane pane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, leftPanel, rightPanel); pane.setDividerLocation(150); Dimension lSize = new Dimension(100, 50); Dimension rSize = new Dimension(100, 400); leftPanel.setMinimumSize(lSize); rightPanel.setMinimumSize(rSize); add(pane); } } leftPanel显示得很好，但我checkboxes上的所有内容都是空白的白色背景，没有别的。我在这做错了什么？

Answer 1

问题是您需要在JLayeredPane的容器上将布局设置为null，并在JLayeredPane上设置边界

JPanel rightPanel = new JPanel();
rightPanel.setLayout(null);
layers.setBounds(0, 0, 300, 300);
rightPanel.add(layers);

这是最终代码

import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
import javax.swing.JSplitPane;
import javax.swing.SwingUtilities;

public class FaceLayout extends JFrame {

    public FaceLayout() {

        ImageIcon face = new ImageIcon(getClass().getResource("/marioblobs/bowser.png"));
        ImageIcon eyes = new ImageIcon(getClass().getResource("/marioblobs/mario.png"));
        ImageIcon nose = new ImageIcon(getClass().getResource("/marioblobs/luigi.png"));
        ImageIcon mouth = new ImageIcon(getClass().getResource("/marioblobs/koopa.png"));

        JLabel fLab = new JLabel(face);
        fLab.setBounds(25, 25, 100, 100);
        JLabel eLab = new JLabel(eyes);
        eLab.setBounds(100, 100, 100, 100);
        JLabel nLab = new JLabel(nose);
        nLab.setBounds(175, 175, 100, 100);
        JLabel mLab = new JLabel(mouth);
        mLab.setBounds(250, 250, 100, 100);

        JCheckBox eBox = new JCheckBox("Eyes", false);
        JCheckBox nBox = new JCheckBox("Nose", false);
        JCheckBox mBox = new JCheckBox("Mouth", false);

        JButton submit = new JButton("Submit");

        JPanel leftPanel = new JPanel(new GridLayout(4, 1));
        leftPanel.add(eBox);
        leftPanel.add(nBox);
        leftPanel.add(mBox);
        leftPanel.add(submit);

        JLayeredPane layers = new JLayeredPane();

        layers.add(fLab, new Integer(1));
        layers.add(eLab, new Integer(2));
        layers.add(nLab, new Integer(3));
        layers.add(mLab, new Integer(4));

        JPanel rightPanel = new JPanel() {
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(400, 400);
            }
        };
        rightPanel.setLayout(null);
        layers.setBounds(0, 0, 400, 400);
        rightPanel.add(layers);

        JSplitPane pane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, leftPanel, rightPanel);
        pane.setDividerLocation(150);

        Dimension lSize = new Dimension(100, 50);
        Dimension rSize = new Dimension(100, 400);
        leftPanel.setMinimumSize(lSize);
        rightPanel.setMinimumSize(rSize);

        add(pane);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setLocationRelativeTo(null);
        setVisible(true);

    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            public void run() {
                new FaceLayout();
            }
        });
    }
}