[英]How can I get rid of the extra padding in a JPanel in java swing
我正在使用基於Windows 10計算器的計算器。 我喜歡它的外觀和感覺,並且向這個項目挑戰自己,以測試我對Java的了解程度。 但是在完成主要設計之后,我注意到窗戶周圍有多余的填充物。 調試並弄清楚之后,我發現額外的填充來自我的主JPanel(mainPanel)內部的三個JPanel(topPanel,middlePanel,bottomPanel)。 我正在使用gridBagLayout,並且將上,下,左和右的所有插圖都設置為0。 而且我不確定如何擺脫多余的填充。 這是我計算器類中的完整代碼
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);
}
}
我嘗試尋找JPanel.setMargin或JPanel.setInsets,卻找不到任何東西。 不確定接下來要去哪里。
紅色邊框在topPanel內部的JTextfield周圍。 綠色邊框在topPanel周圍。 藍色邊框位於mainPanel周圍。 我想擺脫綠色和藍色邊框之間的空間。 我最初將邊框設置為空邊框,我只是用它來測試程序。
編輯:我剛剛嘗試了topPanel.setLocation(0, 0);
但是它什么也沒做。
Edit2:我只是將mainPanel更改為BorderLayout而不是GridBagLayout,然后將topPanel對齊到PAGE_START,將middlePanel對齊到CENTER,將bottomPanel對齊到PAGE_END,這消除了綠色和藍色邊框之間的空間。 但是現在我在紅色和綠色之間有一個空白。
看起來好像不一樣,但是由於窗口裝飾的更改,可縮放性會影響Window的首選大小。 呼叫frame.setResizable
致電前 frame.pack()
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