【发布时间】：2017-08-22 01:02:43
【问题描述】：
我正在开发基于 Windows 10 计算器的计算器。我喜欢它的外观和感觉，我正在向这个项目挑战自己，以测试我对 Java 的了解程度。但是在完成主要设计后，我注意到窗户周围有额外的填充物。在调试并弄清楚之后，我发现额外的填充来自我的三个 JPanel（topPanel、middlePanel、bottomPanel）在我的主 JPanel（mainPanel）中。我正在使用 gridBagLayout 并将顶部、底部、左侧和右侧的所有插图设置为 0。而且我不确定如何摆脱额外的填充。这是我的计算器类的完整代码
package javacalculator.calculator;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.BorderFactory;
import javax.swing.border.Border;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.text.Caret;
import javax.swing.text.DefaultCaret;
public class Calculator {
private final String NAME = "Calculator";
private JFrame frame;
private JPanel mainPanel, topPanel, middlePanel, bottomPanel;
private JTextField storedData;
private JTextField data;
private Caret caret;
private Font font;
private Font font2;
private Font font3;
private Font font4;
private Color color;
private JButton zero, one, two, three, four, five, six, seven, eight, nine;
private JButton plus, minus, multiply, divide, equals;
private JButton negative, decimal;
private JButton ce, c, backspace;
private JButton percent, squareRoot, squared, divideFrom1;
private JButton mc, mr, mplus, mminus, ms, mh;
public Calculator() {
frame = new JFrame(NAME);
mainPanel = new JPanel();
topPanel = new JPanel();
middlePanel = new JPanel();
bottomPanel = new JPanel();
storedData = new JTextField();
data = new JTextField();
caret = new DefaultCaret() {
@Override
public void paint(Graphics g) {
}
@Override
public boolean isVisible() {
return false;
}
@Override
public boolean isSelectionVisible() {
return false;
}
};
font = new Font("Sans-Serif", Font.BOLD, 30);
font2 = new Font("Sans-Serif", Font.PLAIN, 20);
font3 = new Font("Sans-Serif", Font.PLAIN, 15);
font4 = new Font("Sans-Serif", Font.PLAIN, 13);
color = new Color(238, 238, 238);
mc = new JButton("MC");
mr = new JButton("MR");
mplus = new JButton("M+");
mminus = new JButton("M-");
ms = new JButton("MS");
mh = new JButton("MH");
percent = new JButton("%");
squareRoot = new JButton("SQRT");
squared = new JButton("x^2");
divideFrom1 = new JButton("1/x");
ce = new JButton("CE");
c = new JButton("C");
backspace = new JButton("<=");
plus = new JButton("+");
minus = new JButton("-");
multiply = new JButton("X");
divide = new JButton("/");
equals = new JButton("=");
decimal = new JButton(".");
negative = new JButton("+/-");
zero = new JButton("0");
one = new JButton("1");
two = new JButton("2");
three = new JButton("3");
four = new JButton("4");
five = new JButton("5");
six = new JButton("6");
seven = new JButton("7");
eight = new JButton("8");
nine = new JButton("9");
Init();
}
private void Init() {
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ConfigureComponents();
AddComponent(topPanel, storedData, 0, 0, 4, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(topPanel, data, 0, 1, 4, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(middlePanel, mc, 0, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(middlePanel, mr, 1, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(middlePanel, mplus, 2, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(middlePanel, mminus, 3, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(middlePanel, ms, 4, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(middlePanel, mh, 5, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, percent, 0, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, squareRoot, 1, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, squared, 2, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, divideFrom1, 3, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, ce, 0, 1, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, c, 1, 1, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, backspace, 2, 1, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, divide, 3, 1, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, seven, 0, 2, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, eight, 1, 2, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, nine, 2, 2, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, multiply, 3, 2, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, four, 0, 3, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, five, 1, 3, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, six, 2, 3, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, minus, 3, 3, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, one, 0, 4, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, two, 1, 4, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, three, 2, 4, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, plus, 3, 4, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, negative, 0, 5, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, zero, 1, 5, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, decimal, 2, 5, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(bottomPanel, equals, 3, 5, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(mainPanel, topPanel, 0, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(mainPanel, middlePanel, 0, 1, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
AddComponent(mainPanel, bottomPanel, 0, 2, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
frame.add(mainPanel);
frame.pack();
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private void AddComponent(JPanel panel, JComponent component, int x, int y, int width, int height, int position, int stretch) {
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = x;
gbc.gridy = y;
gbc.gridwidth = width;
gbc.gridheight = height;
gbc.weightx = 0;
gbc.weighty = 0;
gbc.anchor = position;
gbc.fill = stretch;
gbc.insets = new Insets(0, 0, 0, 0);
panel.add(component, gbc);
}
private void ConfigureComponents() {
mainPanel.setLayout(new GridBagLayout());
topPanel.setLayout(new GridBagLayout());
middlePanel.setLayout(new GridBagLayout());
bottomPanel.setLayout(new GridBagLayout());
Dimension dim = new Dimension(77, 54);
Dimension dim2 = new Dimension(dim.width * 4, dim.height);
Dimension dim3 = new Dimension(dim.width * 4, dim.height / 2);
Dimension dim4 = new Dimension(dim.width * 4 / 6, dim.height / 2);
Border noBorder = BorderFactory.createEmptyBorder(0, 0, 0, 0);
mainPanel.setBorder(noBorder);
topPanel.setBorder(noBorder);
middlePanel.setBorder(noBorder);
bottomPanel.setBorder(noBorder);
//TESTING
topPanel.setBorder(BorderFactory.createLineBorder(Color.GREEN, 1, false));
mainPanel.setBorder(BorderFactory.createLineBorder(Color.BLUE, 3, false));
//END TESTING
storedData.setPreferredSize(dim3);
storedData.setFont(font3);
storedData.setBackground(Color.WHITE);
storedData.setHorizontalAlignment(JTextField.RIGHT);
storedData.setBorder(noBorder);
//TESTING
storedData.setBorder(BorderFactory.createLineBorder(Color.RED, 1, false));
//END TESTING
storedData.setCaret(caret);
storedData.setEditable(false);
data.setPreferredSize(dim2);
data.setFont(font);
data.setBackground(Color.WHITE);
data.setHorizontalAlignment(JTextField.RIGHT);
data.setBorder(noBorder);
data.setCaret(caret);
data.setEditable(false);
ConfigureComponent(mc, dim4, font4, Color.WHITE, Color.BLACK, noBorder, true, false, false);
mc.setPreferredSize(new Dimension(dim4.width + 1, dim4.height));
ConfigureComponent(mr, dim4, font4, Color.WHITE, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(mplus, dim4, font4, Color.WHITE, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(mminus, dim4, font4, Color.WHITE, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(ms, dim4, font4, Color.WHITE, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(mh, dim4, font4, Color.WHITE, Color.BLACK, noBorder, true, false, false);
mh.setPreferredSize(new Dimension(dim4.width + 1, dim4.height));
ConfigureComponent(percent, dim, font2, Color.WHITE, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(squareRoot, dim, font2, Color.WHITE, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(squared, dim, font2, Color.WHITE, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(divideFrom1, dim, font2, Color.WHITE, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(ce, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(c, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(backspace, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(divide, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(seven, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(eight, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(nine, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(multiply, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(four, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(five, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(six, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(minus, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(one, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(two, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(three, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(plus, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(negative, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(zero, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(decimal, dim, font2, color, Color.BLACK, noBorder, true, false, false);
ConfigureComponent(equals, dim, font2, color, Color.BLACK, noBorder, true, false, false);
middlePanel.setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0, color));
}
private void ConfigureComponent(JButton component, Dimension size, Font font, Color backgroundColor, Color foreGroundColor, Border border, boolean contentAreaFilled, boolean borderPainted, boolean focusPainted) {
component.setPreferredSize(size);
component.setFont(font);
component.setOpaque(true);
component.setBackground(backgroundColor);
component.setForeground(foreGroundColor);
component.setBorder(border);
component.setContentAreaFilled(contentAreaFilled);
component.setBorderPainted(borderPainted);
component.setFocusPainted(focusPainted);
}
}
我尝试寻找 JPanel.setMargin 或 JPanel.setInsets 并找不到任何东西。不知道下一步该去哪里。
红色边框在我的 JTextfield 周围，在 topPanel 内部。绿色边框在 topPanel 周围。蓝色边框在 mainPanel 周围。我想摆脱绿色和蓝色边界之间的空间。我最初将边框设置为空边框，我只是用它来测试我的程序。
编辑：我刚刚尝试了topPanel.setLocation(0, 0);，但它什么也没做。
Edit2：我只是将mainPanel改为BorderLayout而不是GridBagLayout，并将topPanel对齐到PAGE_START，middlePanel对齐到CENTER，bottomPanel对齐到PAGE_END，这样就去掉了绿色和蓝色之间的空间边境。但是现在我在红色和绿色之间有一个差距。
【问题讨论】：
标签： java jpanel padding gridbaglayout