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我試圖使JPanel（「父面板」）的內容從頂部向底部添加，並有寬度每個組件的高度與父面板的寬度相匹配，同時每個組件的高度都包含內容。內容將被動態生成。JPanel與兒童匹配的父寬度和包裝的高度
這是想什麼我它看起來像：
這已經很容易在Android中的事。我已經看過Swing LayoutManagers，但他們似乎都不是一個明顯的選擇。我試過使用Boxlayout（垂直），除了沒有填充父面板寬度的面板（這使得它看起來非常糟糕）之外，它的工作原理。
感謝您的任何建議！
編輯：
由於camickr的答案，我想它了。如果將來有助於任何人，我已經提供了我的代碼和屏幕截圖。
該解決的問題中的代碼：
（注爲GridBagConstraints的使用的GridBagLayout，BorderLayout的和參數）
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Random;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Test extends JFrame{
private final Color darkGreen = Color.decode("#388E3C");
private final Color green = Color.decode("#4CAF50");
private final Color lightGreen = Color.decode("#C8E6C9");
public static void main(String[] args){
Test test = new Test();
test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
int noOfTitles = 4;
int noOfSubTitles = 3;
Random random = new Random();
public Test(){
JPanel parentPanel = new JPanel();
this.setSize(new Dimension(300,800));
this.setContentPane(parentPanel);
parentPanel.setBackground(Color.white);
//Set layout of parent panel to Gridlayout
parentPanel.setLayout(new GridBagLayout());
//Panel for our titles
JPanel titlesPanel = new JPanel();
titlesPanel.setLayout(new BoxLayout(titlesPanel, BoxLayout.Y_AXIS));
for(int i = 0;i<noOfTitles;i++){
//Panel for the subtitles of each title
JPanel subTitlesPanel = new JPanel();
subTitlesPanel.setLayout(new BoxLayout(subTitlesPanel, BoxLayout.Y_AXIS));
for(int j = 0;j<noOfSubTitles;j++){
//Get a panel with a title header, a collapse/uncollapse button and some sample content
subTitlesPanel.add(getCollapsiblePanel(getSampleContent(),"Subtitle"));
subTitlesPanel.setBorder(BorderFactory.createEmptyBorder(0, 10, 0, 0));
}
//Get a panel with a title header, a collapse/uncollapse button and the subtitles as content
titlesPanel.add(getCollapsiblePanel(subTitlesPanel,"Title"));
}
//The constraints for the
GridBagConstraints constraints = new GridBagConstraints();
constraints.anchor = GridBagConstraints.PAGE_START;
constraints.fill = GridBagConstraints.HORIZONTAL; //Fill the panels horizontally. A weightx is needed for this to work.
constraints.gridx = 1;
constraints.gridy = 0;
constraints.weightx = 1; //Actually makes it fill
parentPanel.add(titlesPanel,constraints);
//To actually bump the rest of the other stuff to the top,
//we need something below with a weighty > 0
constraints.gridy = 1;
constraints.weighty = 1;
constraints.anchor = GridBagConstraints.PAGE_END;
parentPanel.add(new JLabel(""),constraints);
this.setVisible(true);
}
/*
* Gets a title for the supplied content-panel.
* The title includes the titleText and a button for collapsing/uncollapsing the content.
*/
private JPanel getCollapsiblePanel(JPanel content,String titleText){
JPanel titlePanel = new JPanel(); //Top container for the title
JPanel title = new JPanel(); //collapse/uncollapse button and title text
title.setLayout(new BoxLayout(title,BoxLayout.X_AXIS));
title.add(getToggleVisibilityIcon(content));
title.add(new JLabel(" "+titleText));
//A border layout is needed here for the fill of the parent panel to work
// (I tried with the box layout but it didn't work)
titlePanel.setLayout(new BorderLayout());
titlePanel.add(title,BorderLayout.PAGE_START);
titlePanel.add(content,BorderLayout.CENTER);
//Vanity
title.setBackground(green);
title.setBorder(BorderFactory.createEmptyBorder(1,1,2,1));
return titlePanel;
}
/*
* Not important, just generates a panel with some "sample" strings.
*/
private JPanel getSampleContent(){
JPanel content = new JPanel();
content.setLayout(new BoxLayout(content,BoxLayout.Y_AXIS));
for(int i = 0; i<1+random.nextInt(3); i++){
String sampleContent = "";
for(int j = 0;j<1 + random.nextInt(5);j++){
sampleContent += "sample ";
}
JLabel sample = new JLabel(sampleContent);
sample.setForeground(Color.decode("#111111"));
content.add(sample);
}
content.setBorder(BorderFactory.createEmptyBorder(2, 2, 2, 2));
content.setBackground(lightGreen);
return content;
}
/*
* Method that returns a JLabel that will toggle the visibility of the
* supplied content panel upon clicking.
*/
private JLabel getToggleVisibilityIcon(JPanel content){
JLabel icon = new JLabel(" V ");
icon.setBackground(green);
icon.setBorder(BorderFactory.createLineBorder(darkGreen,2));
icon.setOpaque(true);
icon.addMouseListener(new MouseListener(){
private JPanel content;
private JLabel icon;
MouseListener init(JPanel content,JLabel icon){
this.content = content;
this.icon = icon;
return this;
}
@Override
public void mouseClicked(MouseEvent e) {
if(content.isVisible()){
content.setVisible(false);
icon.setText(" > ");
}else{
content.setVisible(true);
icon.setText(" V ");
}
}
@Override
public void mousePressed(MouseEvent e) {}
@Override
public void mouseReleased(MouseEvent e) {}
@Override
public void mouseEntered(MouseEvent e) {}
@Override
public void mouseExited(MouseEvent e) {}
}.init(content,icon));
return icon;
}
}
運行的應用程序的屏幕截圖：
參見'org.netbeans.swing.outline.Outline'，看到[這裏]（HTTP：/ /stackoverflow.com/a/15150756/230513）和[there]（http://stackoverflow.com/search?tab=votes&q=user%3a230513%20org.netbeans.swing.outline.Outline）。 – trashgod