java - 如何正确设置 jpanels 的大小？

Question

我有两个 jpanel:jpanel1 和 jpanel2，它们必须根据其内容具有正确的最小尺寸。 jpanel0 是这两个面板的容器，它必须位于框架的左侧。这里是 jpanel3，它应该占据右侧剩余的可用空间。

如何将 jpanel 的大小设置为所有可用空间？

我想要的输出:

我当前的输出:

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;

public class Panels {

public static void main(String[] args) {

    JFrame myFrame = new JFrame();
    myFrame.setLayout(new BorderLayout());

    JTabbedPane jtp = new JTabbedPane();

    JPanel jPaneTab1 = new JPanel();
    jPaneTab1.setLayout(new FlowLayout(FlowLayout.LEFT));

    JPanel jpanel0 = new JPanel();
    jpanel0.setLayout(new BoxLayout(jpanel0, BoxLayout.Y_AXIS));
    jpanel0.setBorder(BorderFactory.createTitledBorder("jpanel0"));
    jpanel0.setBackground(Color.RED);


    JPanel jpanel1 = new JPanel();
    jpanel1.setLayout(new GridBagLayout());
    jpanel1.setBorder(BorderFactory.createTitledBorder("jpanel1"));
    GridBagConstraints gc = new GridBagConstraints();
    jpanel1.setBackground(Color.BLUE);

    JLabel jlabel1 = new JLabel("jlabel1");
    gc.gridx = 0;
    gc.gridy = 0;
    gc.anchor = GridBagConstraints.NORTHWEST;
    gc.insets = new Insets(0, 0, 0, 2);
    jpanel1.add(jlabel1, gc);
    JLabel jlabel2 = new JLabel("jlabel2");
    gc.gridx = 0;
    gc.gridy = 1;
    gc.anchor = GridBagConstraints.NORTHWEST;
    gc.insets = new Insets(0, 0, 0, 2);
    jpanel1.add(jlabel2, gc);


    JPanel jpanel2 = new JPanel();
    jpanel2.setLayout(new GridBagLayout());
    jpanel2.setBorder(BorderFactory.createTitledBorder("jpanel2"));
    GridBagConstraints gc2 = new GridBagConstraints();
    jpanel1.setBackground(Color.BLUE);

    JLabel jlabel3 = new JLabel("jlabel3");
    gc2.gridx = 0;
    gc2.gridy = 0;
    gc2.anchor = GridBagConstraints.NORTHWEST;
    gc2.insets = new Insets(0, 0, 0, 2);
    jpanel2.add(jlabel3, gc2);
    JLabel jlabel4 = new JLabel("jlabel4");
    gc2.gridx = 0;
    gc2.gridy = 1;
    gc2.anchor = GridBagConstraints.NORTHWEST;
    gc2.insets = new Insets(0, 0, 0, 2);
    jpanel2.add(jlabel4, gc2);






    JPanel jpanel3 = new JPanel();
    jpanel3.setBackground(Color.YELLOW);
    JLabel jlabel5 = new JLabel("jpanel3");
    jpanel3.add(jlabel5);

    jpanel0.add(jpanel1);
    jpanel0.add(jpanel2);
    jPaneTab1.add(jpanel0, BorderLayout.WEST);
    jPaneTab1.add(jpanel3, BorderLayout.CENTER);        

    JPanel jPaneTab2 = new JPanel();


    jtp.addTab("tab1", jPaneTab1);
    jtp.addTab("tab2", jPaneTab2);

    myFrame.add(jtp);       
    myFrame.setSize(800, 600);
    myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    myFrame.setVisible(true);
}

}

添加:

当我将 BorderLayout 用于主(选项卡面板)时，我遇到了另一个问题:

Answer 1

当您将布局分解为逻辑面板，然后使用不同的布局管理器嵌套面板时，布局会更容易工作。

例如，使用带有 BorderLayout 的面板作为选项卡式 Pane 的内容。

然后创建一个“骑行侧面板”并将其添加到此面板和一个“中心面板”

JPanel main = new JPanel( new BorderLayout() );
JPanel rightSide = new JPanel( ... );
JPanel center = new JPanel(...);
main.add(rightSide, BorderLayout.LINE_START);
main.add(center, BorderLayout.CENTER);

然后设置“rightSide”和“center”面板的布局，并向每个面板添加组件。