问在Swing GUI中提供空白
EN

Stack Overflow用户

提问于 2013-07-26 14:50:13

回答 3查看 52.9K关注 0票数 167

没有空白的GUI显示为“拥挤”。如何在不显式设置components?的位置或大小的情况下提供空白

java

swing

whitespace

layout-manager

回答 3

Stack Overflow用户

发布于 2014-03-20 14:23:46

当您使用BoxLayout时，Box.createVerticalGlue()方法可以帮助您创建一些空白。

另一种方法是BorderFactory.createEmptyBorder(int top, int left, int bottom, int right)。它可以帮助你在组件周围留出一些空白。

感谢Andrew Thompson的提醒。我最近几天修改了BoxLayout，我发现Box.createVerticalGlue()可以根据面板的大小添加一些空白，你不能明确设置白色space.But的像素值长度，Box.createVerticalStrut()可以做到这一点。下面是一个MCTaRE，展示了这两种方法的效果。

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

public class WhiteSpace extends JFrame{
    static WhiteSpace whiteSpace;
    DemoPanel demoPanel;
    boolean withGlue;
    JSpinner spinner;

    public WhiteSpace(){
        initialWindow();
        demoPanel = new DemoPanel();
        ActionPanel actionPanel = new ActionPanel();

        setLayout(new BorderLayout());

        getContentPane().add(actionPanel,BorderLayout.NORTH);
        getContentPane().add(demoPanel,BorderLayout.CENTER);
            setVisible(true);
    }

    public void initialWindow(){
        setSize(220, 300);
        setTitle("White Space");
        setResizable(false);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        //Show the window in the middle of the screen
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                whiteSpace = new WhiteSpace();
            }
        };
        SwingUtilities.invokeLater(runnable);
    }

    class DemoPanel extends JPanel{
        //Show the vertical white space between label1 and label2
        JLabel label1;
        JLabel label2;
        public void initialDemoPanel(){
            setBorder(BorderFactory.createTitledBorder(getBorder(), "DemoPanel", TitledBorder.LEADING, TitledBorder.TOP, new Font("Default",Font.PLAIN,10), Color.gray));
            setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));

            label1 = new JLabel("This is first line");
            label2 = new JLabel("This is second line");
        }

        public DemoPanel(){
            initialDemoPanel();
            add(label1);
            if(withGlue){
                add(Box.createVerticalGlue());
            }
            add(label2);
        }

        public DemoPanel(int strutValue){
            initialDemoPanel();
            add(label1);
            add(Box.createVerticalStrut(strutValue));
            add(label2);
        }
    }

    class ActionPanel extends JPanel{
        public ActionPanel(){
            setBorder(BorderFactory.createTitledBorder(getBorder(), "ActionPanel", TitledBorder.LEADING, TitledBorder.TOP, new Font("Default",Font.PLAIN,10), Color.gray));

            setLayout(new BoxLayout(this,BoxLayout.X_AXIS));
            JRadioButton glueButton = new JRadioButton("With Glue");
            glueButton.addActionListener(new glueButtonListener());
            add(glueButton);

            add(Box.createHorizontalStrut(10));
            //To create horizontal white space
            JLabel strutLabel = new JLabel("Strut Value");
            add(strutLabel);
            spinner = new JSpinner(new SpinnerNumberModel(0,0,50,1));
            spinner.addChangeListener(new spinnerListener());
            add(spinner);
            //public SpinnerNumberModel(Number value,Comparable minimum,Comparable maximum,Number stepSize)
        }
    }

    class glueButtonListener implements ActionListener{
        @Override
        public void actionPerformed(ActionEvent e) {
            spinner.setValue(new Integer(0));
            withGlue = (withGlue == true ? false:true);
            whiteSpace.getContentPane().remove(demoPanel);
            demoPanel = new DemoPanel();
            whiteSpace.getContentPane().add(demoPanel,BorderLayout.CENTER);
            whiteSpace.getContentPane().validate();
        }
    }

    class spinnerListener implements ChangeListener{

        @Override
        public void stateChanged(ChangeEvent e) {
            int strutValue = (Integer) spinner.getValue();
            whiteSpace.getContentPane().remove(demoPanel);
            demoPanel = new DemoPanel(strutValue);
            whiteSpace.getContentPane().add(demoPanel,BorderLayout.CENTER);
            whiteSpace.getContentPane().validate();
        }
    }
}

也可以使用Box.createHorizontalGlue()和Box.createHorizontalStrut(int height)。此外，Box.createRigidArea(Dimension d)也有创建空白的能力。

票数 22

Stack Overflow用户

发布于 2014-07-09 00:36:48

MigLayout有多种方式来创造空间。(在此布局中，空间称为间隙。)可以在具有布局约束的最高级别创建间隙，可以在行和列之间创建间隙，并且还可以在具有元件约束的单个零部件之间设置间隙。容器的边界周围也有特定的间隙，称为insets，它有自己的特定关键字要设置。

下面的示例创建了所有这些类型的间隙：

package com.zetcode;

import java.awt.EventQueue;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import net.miginfocom.swing.MigLayout;


public class MigLayoutGaps2 extends JFrame {

    public MigLayoutGaps2() {

        initUI();

        setTitle("Gaps");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
    }

    private void initUI() {

        JPanel base = new JPanel(new MigLayout("flowy, ins 30, gap 15"));
        setContentPane(base);

        JPanel pnl1 = new JPanel();
        pnl1.setBorder(
                BorderFactory.createTitledBorder("Grid gaps")
        );

        pnl1.setLayout(new MigLayout("gap 5 5, ins 10, wrap 3"));

        pnl1.add(new JButton("1"));
        pnl1.add(new JButton("2"));
        pnl1.add(new JButton("3"));
        pnl1.add(new JButton("4"));
        pnl1.add(new JButton("5"));
        pnl1.add(new JButton("6"));

        JPanel pnl2 = new JPanel();
        pnl2.setBorder(
                BorderFactory.createTitledBorder("Column gaps")
        );

        pnl2.setLayout(new MigLayout("wrap 3", "[]10[]"));

        JLabel lbl1 = new JLabel();
        lbl1.setBorder(
            BorderFactory.createEtchedBorder()
        );

        JLabel lbl2 = new JLabel();
        lbl2.setBorder(
            BorderFactory.createEtchedBorder()
        );

        JLabel lbl3 = new JLabel();
        lbl3.setBorder(
            BorderFactory.createEtchedBorder()
        );        

        pnl2.add(lbl1, "w 40, h 110");
        pnl2.add(lbl2, "w 40, h 110");
        pnl2.add(lbl3, "w 40, h 110");

        JPanel pnl3 = new JPanel();
        pnl3.setBorder(
                BorderFactory.createTitledBorder("Row gaps")
        );

        pnl3.setLayout(new MigLayout("wrap", "", "[]15[]"));

        JLabel lbl4 = new JLabel();
        lbl4.setBorder(
            BorderFactory.createEtchedBorder()
        );

        JLabel lbl5 = new JLabel();
        lbl5.setBorder(
            BorderFactory.createEtchedBorder()
        );

        JLabel lbl6 = new JLabel();
        lbl6.setBorder(
            BorderFactory.createEtchedBorder()
        );        

        pnl3.add(lbl4, "w 150, h 20");
        pnl3.add(lbl5, "w 150, h 20");
        pnl3.add(lbl6, "w 150, h 20");        

        JPanel pnl4 = new JPanel();
        pnl4.setBorder(
                BorderFactory.createTitledBorder("Component gaps")
        );

        pnl4.setLayout(new MigLayout());

        pnl4.add(new JLabel("Name:"), "gapright 5");
        pnl4.add(new JTextField(10), "gapbottom 20, gaptop 20");

        base.add(pnl1);
        base.add(pnl2);
        base.add(pnl3);
        base.add(pnl4);

        pack();
    }

    public static void main(String[] args) {

        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                MigLayoutGaps2 ex = new MigLayoutGaps2();
                ex.setVisible(true);
            }
        });
    }
}

我们在布局中有四个面板。每个面板都有一个MigLayout管理器。

JPanel base = new JPanel(new MigLayout("flowy, ins 30, gap 15"));

这一行创建了容器插图和面板之间的垂直间隙。

pnl1.setLayout(new MigLayout("gap 5 5, ins 10, wrap 3"));

在这里，我们为整个网格结构应用间隙，并设置容器间隙。

pnl2.setLayout(new MigLayout("wrap 3", "[]10[]"));

这条线在列之间创建间隙。

pnl3.setLayout(new MigLayout("wrap", "", "[]15[]"));

行间距是用以下代码定义的。

pnl4.add(new JLabel("Name:"), "gapright 5");
pnl4.add(new JTextField(10), "gapbottom 20, gaptop 20");

最后，有可能在各个组件之间创建间隙。

票数 13

Stack Overflow用户

发布于 2018-04-01 19:49:39

每当我遇到这个问题时，我都会使用JPanels。例如，在GridLayout中：

JFrame frame = new JFrame;
frame.setLayout(new GridLayout(2, 0));

//We want the bottom left to be blank
frame.add(new JLabel("Top Left"));
frame.add(new JLabel("Top Right"));

//This is the position we want empty
frame.add(new JPanel());

//Now we can continue with the rest of the script

票数 1

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/17874717

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