具有固定高度和可变宽度JButton的布局 [英] Layout with fixed height and variable width JButtons

问题描述

我正在寻找一个具有固定高度的JButton的LayoutManager，其宽度会扩展以适合其Container的大小.在JButton上方，应该在显示"Choose file:"的行上单独放置一个JLabel.它旨在用作JFileChooser的附件，该附件允许用户选择最新文件.我一直无法使其看起来完全正确，我尝试使用多个JPanels和LayoutManagers(例如BoxLayout).当使用BoxLayout时，JButton只能扩展到必须包含其文本的程度.但是我希望所有的JButton都具有相同的宽度，以使它们看起来不那么有趣.

I look for a LayoutManager that has fixed height JButtons that expand in width to fit the size of their Container. Above the JButtons there should be a JLabel by itself on the line that says "Choose file:". This is intended to work as an accessory to a JFileChooser that lets the user choose recent files. I haven't been able to make it look quite right, I've tried using multiple JPanels and LayoutManagers such as BoxLayout. When using BoxLayout the JButtons only expand as far as they have to to contain their text; but I would like for all of the JButtons to be the same width so they don't look funny.

注意:我还使用了其他的LayoutManager，例如Border和GridLayout，但是它们大多忽略了我的尺寸设置，并且看起来还不够复杂.我必须手动执行此操作，Netbeans等不是一种选择.

Note: I've also used other LayoutManagers such as Border and GridLayout but those mostly ignore my size settings and aren't sophisticated enough it would seem. I have to do this by hand, Netbeans etc are not an option.

工作示例，但视觉上不正确

import java.awt.Color;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;


public class Chooser extends JPanel {


    public Chooser(){
        this.setLayout(new GridLayout(0,1));

        JPanel labelPanel = new JPanel();
        JLabel label = new JLabel("Choose a file:");
        labelPanel.add(label);
        labelPanel.setBackground(Color.red);

        JPanel buttonPanel = new JPanel();
        buttonPanel.add(new JButton("long pathname to a file goes here"));
        buttonPanel.setBackground(Color.blue);

        this.add(labelPanel);
        this.add(buttonPanel);
    }


    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Chooser c = new Chooser();
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setAccessory(c);
        fileChooser.showOpenDialog(null);
    }

}

推荐答案

在GridLayout嵌套在BorderLayout(实际上是JScrollPane)中的情况下呢?

What about something where a GridLayout is nested in a BorderLayout (actually in a JScrollPane)...

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;

import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

public class Chooser extends JPanel {
   private static final String[] BUTTON_TEXTS = { "Hello", "Goodbye",
         "Hello Goodbye", "Adios", "This is a long String for WTF" };

   public Chooser() {
      this.setLayout(new BorderLayout());

      JPanel labelPanel = new JPanel();
      JLabel label = new JLabel("Choose a file:");
      labelPanel.add(label);
      labelPanel.setBackground(Color.red);

      JPanel buttonPanel = new JPanel(new GridLayout(0, 1));
      for (int i = 0; i < BUTTON_TEXTS.length; i++) {
         buttonPanel.add(new JButton(BUTTON_TEXTS[i]));
      }
      buttonPanel.add(Box.createVerticalGlue()); // to pad the bottom if needed
      buttonPanel.setBackground(Color.blue);

      this.add(labelPanel, BorderLayout.PAGE_START);
      this.add(new JScrollPane(buttonPanel), BorderLayout.CENTER);
   }

   public static void main(String[] args) {
      Chooser c = new Chooser();
      JFileChooser fileChooser = new JFileChooser();
      fileChooser.setAccessory(c);
      fileChooser.showOpenDialog(null);
   }

}

带有简单JList的示例2，它将其选择内容放置在文件选择器中:

Example 2 with a simple JList that places its selection in the file chooser:

import java.awt.*;
import java.io.File;

import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class Chooser extends JPanel {
   private static final String[] BUTTON_TEXTS = { "Hello", "Goodbye",
         "Hello Goodbye", "Adios", "This is a long String for WTF", "Hello",
         "Goodbye", "Hello Goodbye", "Adios", "This is a long String for WTF" };

   public Chooser(final JFileChooser fileChooser) {
      setLayout(new BorderLayout());

      JPanel labelPanel = new JPanel();
      JLabel label = new JLabel("Choose a file:");
      labelPanel.add(label);
      labelPanel.setBackground(Color.red);

      final JList list = new JList(BUTTON_TEXTS);
      list.addListSelectionListener(new ListSelectionListener() {
         public void valueChanged(ListSelectionEvent e) {
            String selectedString = list.getSelectedValue().toString();
            fileChooser.setSelectedFile(new File(selectedString));
         }
      });

      add(labelPanel, BorderLayout.PAGE_START);
      add(new JScrollPane(list), BorderLayout.CENTER);
   }

   public static void main(String[] args) {
      JFileChooser fileChooser = new JFileChooser();
      Chooser c = new Chooser(fileChooser);
      fileChooser.setAccessory(c);
      fileChooser.showOpenDialog(null);
   }

}

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