如何修复GridBagLayout中的间隙 [英] How to fix gap in GridBagLayout

问题描述

我正在使用GridBagLayout创建一个名为'Preset'的JPanel，该JPanel在JFrame中被复制了几次.每个预设将具有多行(JPanels).我的目标是只显示一行(第一行)，但是当单击编辑按钮时，它们都会全部显示.现在，编辑"按钮可以使用，但是行与行之间有很大的空间.我希望当多余的行合拢时，每个预设"将彼此直接位于上方(无空格).您可以在下图中看到我在说什么.

I am using a GridBagLayout to create a JPanel, called 'Preset' that gets replicated several times in a JFrame. Each Preset will have multiple rows (JPanels). My goal is that only one line (the first) will show up, but when the edit button is clicked they will all show. Right now, the edit button works, but there is a massive space between lines. I want it to be that when the extra lines are collapsed, each Preset will be directly above each other (no space). You can see in the following picture what I am talking about.

这是它的外观:

这是我希望它看起来的样子:

This is how I want it to Look:

我相当确定我需要对GridBag做些事情，但是我不知道该怎么做.我已经阅读了好几本教程，并按照我认为的样子写了它，但是没有运气.谢谢你.

I am fairly certain I need to do something with the GridBag but I don't know what. I have read several tutorials and have written it as I thought it should be, but no luck. Thanks in advanced.

package SSCCE;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;

public class UI extends JFrame{
    private final static int HEIGHT = 600;
    private final static int WIDTH = 730;
    private JPanel pane; //Pane that stores accounts
    private JScrollPane scroller;
    private Preset[] branches;    

    public static void main(String[] args) {
        JFrame frame = new UI();
    }    

    public UI(){
        //Make the UI close when the exit button is clicked
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    

        //Sets the size of the UI
        this.setSize(WIDTH, HEIGHT);

        //Set the layout and add components to it
        this.setLayout(new BorderLayout());

        //Reads in the settings and sets up the branches
        populateBranches();

        pane = new JPanel();
        pane.setLayout(new GridLayout(branches.length,1));
        for (int i = 0; i < branches.length; i++){
            pane.add(branches[i]);
        }

        //Create the center pane of the BorderLayout
        scroller = new JScrollPane(pane);
        scroller.createVerticalScrollBar();
        this.add(scroller,BorderLayout.CENTER);

        //Makes the UI visible
        this.setVisible(true);
    }

    private void populateBranches(){
        //Populates the branches array based on what is read in, or not read in from the file
        branches = new Preset[15];

    for (int i = 0; i < branches.length; i++){
        branches[i] = new Preset();
        branches[i].setEnabled(false);
    }
}

public class Preset extends JPanel{
    private JTextField eName;
    private JButton edit;
    private JButton activate;
    private JComboBox printer;
    private JPanel line1;
    private JPanel line2;
    private String branchName;
    private String ipAddress;
    private boolean enableAll;

    public Preset(){
        eName = new JTextField(20);
        edit = new JButton("Edit");
        activate = new JButton("Activate");

        JPanel nameContainer = new JPanel();
        nameContainer.setLayout(new FlowLayout());
        nameContainer.add(eName);

        printer = new JComboBox();

        //
        line1 = new JPanel();
        line1.setLayout(new FlowLayout());
        line1.add(nameContainer);
        line1.add(edit);
        line1.add(activate);

        //
        line2 = new JPanel();
        line2.setLayout(new BorderLayout());
        line2.add(printer, BorderLayout.WEST);

        GridBagLayout grid = new GridBagLayout();
        GridBagConstraints cons = new GridBagConstraints();
        cons.fill = GridBagConstraints.BOTH;
        this.setLayout(grid);

        cons.ipady = 100;
        cons.ipadx = 100;
        cons.weighty = 0D;
        cons.gridx = 0;
        cons.gridy = 0;
        cons.gridwidth = 2;
        cons.gridheight = 1;
        grid.setConstraints(line1, cons);
        this.add(line1);

        cons.ipady = 100;
        cons.ipadx = 100;
        cons.weighty = 0D;
        cons.gridx = 0;
        cons.gridy = 1;
        cons.gridwidth = 2;
        cons.gridheight = 1;
        grid.setConstraints(line2, cons);
        this.add(line2);

        //Enable all components
        enableAll = true;
    }
}
}

推荐答案

删除为Preset JPanel的GridBagConstraints的Y轴分配填充的所有语句，即

Remove every statement that assigns padding in the Y AXIS for the GridBagConstraints of the Preset JPanel, i.e.

cons.ipady = 100;

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