GUI:如何正确设置布局 [英] GUI: how to properly set layout

问题描述

我在设置布局时遇到一些问题. (不要介意按钮的大小，我只是想正确地了解布局).

I'm having some issues with setting layouts. (Don't mind the sizes of the buttons, I just want to understand layouts properly).

这是我要制作的窗口:

这是我尝试过的窗口:

这是我的代码:

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

class Grid extends JFrame
{
    private JTextField t1;
    private JTextField t2;
    private JCheckBox c1;
    private JCheckBox c2;
    private JButton b1;
    private JButton b2;
    private JButton b3;
    private JPanel ButtonPanel1;
    private JPanel ButtonPanel2;
    private JPanel ButtonPanel3;
    private JPanel CheckPanel1;
    private JPanel CheckPanel2;
    private JPanel TextPanel1;
    private JPanel TextPanel2;
    private JPanel EastPanel;
    private JPanel CenterPanel;
    private JPanel WestPanel;
    private JLabel l1;
    private JLabel l2;

    public Grid()
    {
        //CheckBoxes
         c1 = new JCheckBox("Snap to Grid");
         c2 = new JCheckBox("Show Grid");

         CheckPanel1 = new JPanel();
         CheckPanel1.add(c1);

         CheckPanel2 = new JPanel();
         CheckPanel2.add(c2);
         WestPanel = new JPanel(new GridLayout(2,1));
         WestPanel.add(c1);
         WestPanel.add(c2);
         add(WestPanel,BorderLayout.WEST);

          //I don't get how to arrange the labels aligned with the textfields. 

         //TextFields
         l1 = new JLabel("X:");
         t1 = new JTextField("8",3);
         l2 = new JLabel("Y:");
         t2 = new JTextField("8",3);

         TextPanel1 = new JPanel();
         TextPanel1.add(l1);
         TextPanel1.add(t1);

         TextPanel2 = new JPanel();
         TextPanel2.add(l2);
         TextPanel2.add(t2);

         CenterPanel = new JPanel(new GridLayout(2,1));
         CenterPanel.add(l1);
         CenterPanel.add(l2);
         CenterPanel.add(t1);
         CenterPanel.add(t2);
         add(CenterPanel,BorderLayout.CENTER); 

         // Buttons
         b1 = new JButton("Ok");
         b2 = new JButton("Cancel");
         b3 = new JButton("Help");

         ButtonPanel1 = new JPanel();
         ButtonPanel1.add(b1);

         ButtonPanel2 = new JPanel();
         ButtonPanel2.add(b2);

         ButtonPanel3 = new JPanel();
         ButtonPanel3.add(b3);

         EastPanel = new JPanel(new GridLayout(3,1));
         EastPanel.add(ButtonPanel1);
         EastPanel.add(ButtonPanel2);
         EastPanel.add(ButtonPanel3);

         add(EastPanel, BorderLayout.EAST);

    }
}

public class oottest {

    public static void main(String[] args) {

        Grid app = new Grid();

        app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        app.setSize(300,150);
        app.setVisible(true);
    }

}

有人可以帮助我了解布局的工作原理吗?

Can anyone help me understand how layout works?

我一直在观看许多视频，并尝试过不同的布局，但仍然无法正确完成.告诉我我是否使用了正确的布局，或者是否应该更改它.

I have been watching lots of videos and tried different layouts but still can't get it right. Tell me if I used the correct layout or if I should change it.

推荐答案

GridBagLayout给您所需的所有控制权.
如果您愿意为简单起见而牺牲一些控制，则可以在GridLayout中使用两个FlowLayout面板:

GridBagLayout as proposed in this answer can give all the control you need for the left part.
If you are willing to sacrifice some control for the sake of simplicity, you can get away with two FlowLayout panels inside a GridLayout:

import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

class Grid extends JFrame
{
    private JTextField t1, t2;
    private JCheckBox c1, c2;
    private JButton b1, b2, b3;
    private JPanel topPanel, bottomPanel;
    private JPanel eastPanel, centerPanel;
    private JLabel l1, l2;

    public Grid()
    {
         c1 = new JCheckBox("Snap to Grid");
         l1 = new JLabel("X:");
         t1 = new JTextField("8",3);

         topPanel = new JPanel();//uses flow layout by default
         topPanel.add(c1); topPanel.add(l1); topPanel.add(t1);

         c2 = new JCheckBox("Show Grid");
         l2 = new JLabel("Y:");
         t2 = new JTextField("8",3);

         bottomPanel = new JPanel();
         bottomPanel.add(c2);  bottomPanel.add(l2); bottomPanel.add(t2);

         centerPanel = new JPanel(new GridLayout(2,1));
         centerPanel.add(topPanel);
         centerPanel.add(bottomPanel);
         add(centerPanel,BorderLayout.CENTER);

         b1 = new JButton("Ok");
         b2 = new JButton("Cancel");
         b3 = new JButton("Help");

         eastPanel = new JPanel(new GridLayout(3,1));
         eastPanel.add(b1);
         eastPanel.add(b2);
         eastPanel.add(b3);
         add(eastPanel, BorderLayout.EAST);
    }

    public static void main(String[] args) {

        Grid app = new Grid();
        app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        app.setSize(300,150);
        app.setVisible(true);
    }
}

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更多应用此策略的示例: 1 3

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More examples of applying this strategy: 1 2 and 3

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