使用miglayout和嵌套面板的Swing布局

Question

我有一个使用SwingLayout的Swing程序。 Swing组件的结构如下所示。

JFrame 
    JPanel (Cardlayout) 
     JPanel (Miglayout) - Main panel 
      Jpanel (Flowlayout) - Checkbox Panel 
      JPanel (Flowlayout) - Option Panel 

我现在的问题是，我不知道如何防止复选框面板增长。我不希望它“推”出它在右边的列。我想Wraplayout（可在选项面板上正常工作）在复选框面板的内容过大时将其封装起来。

这是从Eclipse的WindowsBuilder GUI中查看它的视图。其中带有“网站”标签的面板是复选框面板。直接在复选框面板的右侧是选项面板。包含它们的大面板是主面板。 http://i.imgur.com/S7Njo.png

这是当我添加了太多的复选框 http://i.imgur.com/f2SZz.png

我的主要问题是什么情况是，我不明白为什么设置在mainPanel中第一列没有按在列约束“成长0””当内部组件变得太大时，防止它增长，因为我向站点面板添加了新的复选框（站点面板可以有任意数量的复选框）。

这是我的主面板miglayout。

mainPanel.setLayout(new MigLayout("", "[][grow]", "[][][][][][][][grow]")); 

这里是我的，当我添加复选框面板

siteCheckBoxPanel = new JPanel(); 
mainPanel.add(siteCheckBoxPanel, "cell 0 0,alignx left,gapx 0px,aligny center"); 
siteCheckBoxPanel.setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5)); 

我也尝试过不流布局的构成要素的制约，而不能解决任何事情。任何你可以提供的见解都会很棒！如果有问题，我也很乐意提供更多信息。仅供参考我也尝试过“复选框面板”所在单元的列和行约束条件下的“增长0”。

这是一个SSCCE。你可以抓住下面的来源。你需要的唯一依赖是miglayout。您可以点击按钮来添加复选框。

https://dl.dropbox.com/u/20614368/Test.java

import java.awt.CardLayout; 
import java.awt.Color; 
import java.awt.EventQueue; 
import java.awt.event.ActionEvent; 

import javax.swing.AbstractAction; 
import javax.swing.Action; 
import javax.swing.JButton; 
import javax.swing.JCheckBox; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JTextArea; 
import javax.swing.border.EmptyBorder; 

import net.miginfocom.swing.MigLayout; 


public class Test extends JFrame { 


    public static void main(String[] args) { 
     EventQueue.invokeLater(new Runnable() { 
      private Test frame; 

      public void run() { 
       try { 
        frame = new Test(); 
        frame.setVisible(true); 
       } catch (Exception e) { 
        e.printStackTrace(); 
       } 
      } 
     }); 
    } 

    private JPanel contentPane; 
    private JPanel mainPanel; 
    private JPanel optionPanel; 
    private JButton btnUploadImages; 
    private JLabel thumbnailLabel; 
    private JTextArea textArea; 
    private JPanel checkboxPanel; 
    private final Action action = new SwingAction(); 

    /** 
    * Create the frame. 
    */ 
    public Test() { 
     setVisible(true); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setBounds(100, 100, 1098, 846); 
     contentPane = new JPanel(); 
     contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); 
     setContentPane(contentPane); 
     contentPane.setLayout(new CardLayout(0, 0)); 

     mainPanel = new JPanel(); 
     mainPanel.setName(""); 
     contentPane.add(mainPanel, "name_329556913535654"); 
     mainPanel.setLayout(new MigLayout("", "[][grow]", "[][][][][][][][grow]")); 


     JLabel lblPicture = new JLabel("Picture"); 
     mainPanel.add(lblPicture, "cell 0 1"); 

     optionPanel = new JPanel(); 
     optionPanel.setBackground(Color.red); 
     mainPanel.add(optionPanel, "cell 1 0 1 5,grow"); 

     btnUploadImages = new JButton("Upload Images"); 
     btnUploadImages.setAction(action); 

     thumbnailLabel = new JLabel(""); 
     mainPanel.add(thumbnailLabel, "cell 0 4"); 

     textArea = new JTextArea(); 
     mainPanel.add(btnUploadImages, "cell 0 6"); 

     checkboxPanel = new JPanel(); 
     checkboxPanel.setBackground(Color.green); 
     mainPanel.add(checkboxPanel, "flowx,cell 0 0"); 

     JLabel lblSites = new JLabel("Sites"); 
     checkboxPanel.add(lblSites); 


    } 
    private class SwingAction extends AbstractAction { 
     public SwingAction() { 
      putValue(NAME, "Add checkbox"); 
      putValue(SHORT_DESCRIPTION, "Some short description"); 
     } 
     public void actionPerformed(ActionEvent e) { 
      JCheckBox box = new JCheckBox(); 
      box.setName("Foobar!"); 
      checkboxPanel.add(box); 
      contentPane.validate(); 
      contentPane.repaint(); 
     } 
    } 
} 

Answer 1

从理论上说，你希望你的设置应工作 - 只要你告诉布局

• 不会增长到一个最大值，f.i.第一列通过将最大值设置为百分比
• 不缩小其pref，f.i下的optionPanel列。通过在列约束最小设置为PREF

例如列约束：

// first column - restrict max 
"[grow, fill, n:pref:30%]" + 
// second column - restrict min 
"[grow, pref:pref:n]" 

实际上，我不能做的FlowLayout和MigLayout良好地合作以任何约束：即使初始布局被打破（fi optionPanel推出框架宽度）。由Rob's WrapLayout替代FlowLayout看起来更好，虽然不完全最佳，因为箱子并未完全对齐。

/* 
* Created on 12.09.2012 
* 
*/ 
package layout; 

import java.awt.CardLayout; 
import java.awt.Color; 
import java.awt.EventQueue; 
import java.awt.FlowLayout; 
import java.awt.event.ActionEvent; 

import javax.swing.AbstractAction; 
import javax.swing.Action; 
import javax.swing.JButton; 
import javax.swing.JCheckBox; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JTextArea; 
import javax.swing.border.EmptyBorder; 

import net.miginfocom.swing.MigLayout; 

public class MigLayoutNested extends JFrame { 


    public static void main(String[] args) { 
     EventQueue.invokeLater(new Runnable() { 
      private MigLayoutNested frame; 

      public void run() { 
       try { 
        frame = new MigLayoutNested(); 
        frame.pack(); 
//     frame.setSize(frame.getWidth(), frame.getHeight()* 2); 
        frame.setVisible(true); 
       } catch (Exception e) { 
        e.printStackTrace(); 
       } 
      } 
     }); 
    } 

    private JPanel contentPane; 
    private JPanel mainPanel; 
    private JPanel optionPanel; 
    private JButton btnUploadImages; 
    private JLabel thumbnailLabel; 
    private JTextArea textArea; 
    private JPanel checkboxPanel; 
    private final Action action = new SwingAction(); 

    /** 
    * Create the frame. 
    */ 
    public MigLayoutNested() { 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     contentPane = (JPanel) getContentPane(); //new JPanel(); 
     contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); 
     contentPane.setLayout(new CardLayout(0, 0)); 

     mainPanel = new JPanel(); 
     contentPane.add(mainPanel, "name_329556913535654"); 

     mainPanel.setLayout(new MigLayout("debug", 
       "[grow, fill][grow, pref:pref:n]" 
       , "[grow, fill][][][][][][][grow]" 
       )); 

     // stand-in to simulate a row-spanning all-growing component 
     optionPanel = new JPanel(); 
     ((FlowLayout) optionPanel.getLayout()).setAlignment(JLabel.RIGHT); 
     JLabel option = new JLabel("just some label so we see the trailing corner, long enough"); 
     optionPanel.add(option); 
     optionPanel.setBackground(Color.YELLOW); 
     mainPanel.add(optionPanel, "cell 1 0 1 5, grow"); 

     // the panel to dynamically add components to 
     // expected behaviour is to wrap on revalidate if needed 
     // not working with FlowLayout, but looks half-way fine 
     // with Rob's WrapLayout 
     checkboxPanel = new JPanel(new WrapLayout()); 
     checkboxPanel.setBackground(Color.green); 
     JLabel lblSites = new JLabel("Sites"); 
     checkboxPanel.add(lblSites); 
     mainPanel.add(checkboxPanel, "cell 0 0"); 

     JLabel lblPicture = new JLabel("Picture"); 
     mainPanel.add(lblPicture, "cell 0 1"); 

     thumbnailLabel = new JLabel("thumb"); 
     mainPanel.add(thumbnailLabel, "cell 0 3"); 
     textArea = new JTextArea(10, 10); 
     mainPanel.add(textArea, "cell 0 4"); 

     btnUploadImages = new JButton("Upload Images"); 
     btnUploadImages.setAction(action); 
     mainPanel.add(btnUploadImages, "cell 0 6"); 


    } 
    private class SwingAction extends AbstractAction { 
     public SwingAction() { 
      putValue(NAME, "Add checkbox"); 
      putValue(SHORT_DESCRIPTION, "Some short description"); 
     } 
     @Override 
     public void actionPerformed(ActionEvent e) { 
      JCheckBox box = new JCheckBox(); 
      box.setName("Foobar!"); 
      checkboxPanel.add(box); 
      checkboxPanel.revalidate(); 
     } 
    } 
}