如何解决Java,网格包布局如何将组件正确添加到其他组件
我正在学习 JSwing,我发现了 GridBagLayout。
我正在尝试创建一个简单的计算器,我通过添加多个 JPanel 设置每个 preferredSize 来做到这一点,但是当我调整窗口框架的大小时,面板也不会调整大小。 然后我发现了 GridBagLayout。
但这就是我得到的:Wrong calculator with GridBagLayout
import javax.swing.*;
import java.awt.*;
public class Calc extends JFrame {
private final int WIDTH = 300;
private final int HEIGHT = 450;
public Calc(){
setSize(WIDTH,HEIGHT);
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BorderLayout());
mainPanel.add(createButtons(),BorderLayout.soUTH);
add(mainPanel);
}
private JPanel createButtons(){
JPanel panel = new JPanel();
GridBagLayout layout = new GridBagLayout();
panel.setLayout(layout);
GridBagConstraints g = new GridBagConstraints();
g.gridx = 0;
g.gridy = 0;
for(int i = 0; i < 9; i++){
panel.add(new JButton(""+i),g);
g.gridx++;
if(g.gridx == 3) {
g.gridx = 0;
g.gridy++;
}
}
return panel;
}
public static void main(String... args){
Calc calc = new Calc();
calc.setVisible(true);
}
}
应该是这样的: Right calculator
我试过:
- 设置锚点...但不起作用,
- 创建多个 JPanel(一个带有 GridLayout)但不起作用
如果你不想偷代码,那也没关系..但是我应该从哪里开始呢?
编辑: 我弄清楚如何排列按钮......但我无法设置标题以填充所有 x 轴: 代码:
import javax.swing.*;
import java.awt.*;
public class ButtonPanel extends JPanel {
JPanel top;
JPanel left;
JPanel right;
private class CButton extends JButton{
private Operation operation;
public CButton(){
}
}
public ButtonPanel(){
initComponent();
initLayout();
}
private void initLayout() {
GridBagLayout layout = new GridBagLayout();
this.setLayout(layout);
layout.columnWeights = new double[] {3,1};
layout.rowWeights = new double[] {1,1};
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.fill = GridBagConstraints.BOTH;
c.weightx = 5;
this.add(top,c);
c.gridy++;
c.weighty=1;
this.add(left,c);
c.gridx++;
this.add(right,c);
}
private void initComponent() {
top = new JPanel();
top.setLayout(new GridLayout(1,3));
for(int i = 0; i < 3; i++){
top.add(new JButton("bbb"));
}
left = new JPanel();
left.setLayout(new GridLayout(3,3));
for(int i = 0; i < 9; i++){
left.add(new JButton(""+i));
}
right = new JPanel();
right.setLayout(new GridLayout(3,1));
for(int i = 0; i < 3; i++){
JButton btn = new JButton("aa");
right.add(btn);
}
}
public static void main(String[] args) {
JFrame frame = new JFrame("test");
frame.setLayout(new BorderLayout());
frame.add(new ButtonPanel(),BorderLayout.soUTH);
frame.setSize(300,450);
frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
应该是:Image
解决方法
您可能可以在单个面板中完成所有操作,其中一些按钮跨越多列。
所以我给你一个不同的例子来使用单个 GridBagLayout 布局按钮,在这里你可以将你的按钮排列定义为一个值数组,检查它是否可以成为你项目的一个很好的起点。
package test;
import static test.Calculator.Buttons.*;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashMap;
import java.util.Map;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Calculator extends JPanel {
//Here define all possible buttons with labels
public enum Buttons {
PERCENT("%"),CE("CE"),CLEAR("C"),ONE("1"),TWO("2"),THREE("3"),FOUR("4"),FIVE("5"),SIX("6"),SEVEN("7"),EIGHT("8"),NINE("9"),ZERO("0"),ADD("+"),SUB("-"),MULT("x"),DIV("/"),RESULT("="),DECPOINT(".");
protected String text;
Buttons(String txt) {
this.text=txt;
}
public String getText() {
return text;
}
};
//This array contains your keypad layout,contiguous repeated elements will span across multiple columns (e.g. ZERO).
protected Buttons[][] keyPad = {
{PERCENT,CE,CLEAR,DIV},{SEVEN,EIGHT,NINE,MULT},{FOUR,FIVE,SIX,ADD},{ONE,TWO,THREE,SUB},{ZERO,ZERO,DECPOINT,RESULT}
};
Map<JButton,Buttons> sourceMap=new HashMap<>();
ActionListener padListener=new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
onKeyPadPressed(sourceMap.get(e.getSource()));
}
};
public Calculator() {
setLayout(new GridBagLayout());
GridBagConstraints c=new GridBagConstraints();
c.weightx=1.0;
c.weighty=1.0;
c.fill=GridBagConstraints.BOTH;
for (int y=0;y<keyPad.length;y++) {
for (int x=0;x<keyPad[y].length;) {
Buttons b=keyPad[y][x];
if (b==null) {
continue;
}
JButton btn=new JButton(b.getText());
c.gridx=x;
c.gridy=y;
c.gridwidth=0;
while(x<keyPad[y].length&&keyPad[y][x]==b) {
c.gridwidth++;
x++;
}
add(btn,c);
sourceMap.put(btn,b);
btn.addActionListener(padListener);
}
}
}
//Callback method,whenever a button is clicked you get the associated enum value here
protected void onKeyPadPressed(Buttons b) {
System.out.println("Pressed "+b);
switch (b) {
// case ZERO:
// .... here your logic
}
}
public static void main(String[] args) {
JFrame frame=new JFrame("Calculator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setContentPane(new Calculator());
frame.pack();
frame.setVisible(true);
}
}
上面的代码产生了这个结果,但是添加/删除按钮和改变布局真的很容易。
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