java - 我应该使用什么设置来解决这个 GridBagLayout 大小调整问题？

Question

我一直在寻找并尝试解决我在 GridBagLayout 调整大小时遇到​​的问题，但无济于事。问题是:

1. 我将 JDialog 窗口的底部向下拖动以使其变高；搜索面板(下面屏幕截图中的面板上方)不断变高，只是添加了它的内容不需要的空白(我不希望这个浪费的空间占用它下面的滚动表的高度)。

2. 如果我移动窗口的右侧使其变窄一点，即使我的屏幕和窗口可以显示其完整高度，滚动面板也会变得太短；出现垂直滚动条(我不喜欢面板垂直滚动，只是水平滚动。)

我的 JDialog 在右上部分包含以下组件，使用以下布局管理器和约束:

JPanel      level 1         uses GridBagLayout Setting 1 (see below)
JScrollPane level 2         uses GridBagLayout Setting 1  
JPanel      level 3         uses GridBagLayout Setting 2
JPanel      level 4         uses GridBagLayout Setting 2
JPanel      level 5         uses GridBagLayout Setting 2
JPanel      level 5         uses GridBagLayout Setting 2

GridBagLayout.GridBagConstraints (c)

设置 1:

c.fill = GridBagConstraints.BOTH;
c.weightx = 99.0;
c.weighty = 99.0;

设置 2:

c.fill = GridBagConstraints.NONE;
c.weightx = 1.0;
c.weighty = 1.0;

本来，如果我不使用JScrollPane，这是我的JDialog:

如果我拖动窗口使其变大，JPanel 的大小(这是我在使用 JScrollPane 使其水平滚动之前使用的大小)保持不变这是。我想实现相同的行为，只是我想让它水平滚动。

我应该使用什么布局管理器来解决这个大小调整问题？如果我真的必须使用 GridBagLayout，我应该使用什么约束/设置？我将不胜感激任何建议。谢谢!

更新 1 ---------------------------------------- --------------

请检查下面的示例代码场景。两个可滚动面板(红色和蓝色)都使用 GridBagConstraints.BOTH、weightx 和 weighty 等于 99.0。我希望红色面板的高度足以包含文本字段。我还希望当对话框被向下拖动以使窗口变大时，红色面板的高度保持不变。请注意，在实际屏幕中，两个面板的内容数量可能会发生变化(存在加/减按钮)，因此，设置最小面板大小(用于调整大小)将无济于事。请建议我应该如何处理这个案子。谢谢!

package cfr.view.search;

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;

public class GBLSample extends JDialog {

    private JPanel contentPane;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    GBLSample frame = new GBLSample();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public GBLSample() {
        setBounds(100, 100, 350, 400);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        GridBagLayout gbl_contentPane = new GridBagLayout();
        contentPane.setLayout(gbl_contentPane);

        // RED PANEL ------------------------------------------------ 
        JScrollPane sp1 = new JScrollPane();
        GridBagConstraints gbc1 = new GridBagConstraints();
        gbc1.fill = GridBagConstraints.BOTH;
        gbc1.weightx = 99.0;
        gbc1.weighty = 99.0;
        contentPane.add(sp1, gbc1);

        JPanel redPanel = new JPanel();
        redPanel.setBackground(Color.RED);
        JTextField field = new JTextField(20);
        GridBagConstraints gbc2 = new GridBagConstraints();
        gbc2.anchor = GridBagConstraints.PAGE_START;
        gbc2.fill = GridBagConstraints.NONE;
        contentPane.add(field, gbc2);

        redPanel.add(field);
        sp1.setViewportView(redPanel);

        // BLUE PANEL ------------------------------------------------ 
        JScrollPane sp2 = new JScrollPane();
        GridBagConstraints gbc3 = new GridBagConstraints();
        gbc3.fill = GridBagConstraints.BOTH;
        gbc3.gridx = 0;
        gbc3.gridy = 1;
        gbc3.weightx = 99.0;
        gbc3.weighty = 99.0;
        contentPane.add(sp2, gbc3);

        JPanel bluePanel = new JPanel();
        bluePanel.setBackground(Color.BLUE);
        sp2.setViewportView(bluePanel);
    }
}

更新 2 ---------------------------------------- --------------

JPanel 的大小调整仍然存在与上述 #1 相同的问题。问题一

Answer 1

试试这段代码:

package test;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.border.EmptyBorder;

public class GridBagLayoutSample extends JFrame {

private JPanel contentPane;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                GridBagLayoutSample frame = new GridBagLayoutSample();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
public GridBagLayoutSample() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    GridBagLayout gbl_contentPane = new GridBagLayout();
    gbl_contentPane.columnWidths = new int[]{0, 0};
    gbl_contentPane.rowHeights = new int[]{50, 0, 0};
    //the 1.0 value in columnWeights let redPanel and scrollPane (that contain bleuPanel) grow horizontally
    //the 1.0 value is in the first index so it affect the first column
    //you still need to use a valid value for gbc_redPanel.fill and gbc_scrollPane.fill;
    gbl_contentPane.columnWeights = new double[]{1.0, Double.MIN_VALUE};
    //the 0.0 value of rowWeights => components in first row will not grow
    //the 0.0 value of rowWeights => components in second row will grow
    gbl_contentPane.rowWeights = new double[]{0.0, 1.0, Double.MIN_VALUE};
    contentPane.setLayout(gbl_contentPane);

    JPanel redPanel = new JPanel();
    redPanel.setBackground(Color.RED);
    GridBagConstraints gbc_redPanel = new GridBagConstraints();
    gbc_redPanel.insets = new Insets(0, 0, 5, 0);
    gbc_redPanel.fill = GridBagConstraints.BOTH;
    gbc_redPanel.gridx = 0;
    gbc_redPanel.gridy = 0;
    contentPane.add(redPanel, gbc_redPanel);

    JScrollPane scrollPane = new JScrollPane();
    GridBagConstraints gbc_scrollPane = new GridBagConstraints();
    gbc_scrollPane.fill = GridBagConstraints.BOTH;
    gbc_scrollPane.gridx = 0;
    gbc_scrollPane.gridy = 1;
    contentPane.add(scrollPane, gbc_scrollPane);

    JPanel bleuPanel = new JPanel();
    bleuPanel.setBackground(Color.BLUE);
    //scrollpane work with the preferred size of the component in the viewportView
    //try to change this values
    bleuPanel.setPreferredSize(new Dimension(400, 400));
    scrollPane.setViewportView(bleuPanel);
}

将此添加到您的代码中

gbl_contentPane.rowHeights = new int[]{40, 0, 0};
gbl_contentPane.rowWeights = new double[]{0.0,0.0, 1.0, Double.MIN_VALUE};
gbc1.gridx = 0;
gbc1.gridy = 0;

并删除这个

gbc1.weightx = 99.0;
gbc1.weighty = 99.0;