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我即將學習Java。我試圖用一個GridBagLayout爲一個簡單的計算器編寫一個GUI。GridBagLayout不接受我的rowspan命令（gridtheight）
問題是我的「+」按鈕沒有超過2行高。我不知道爲什麼？我試圖用一次做最後一排：
c.gridwidth = 1; c.gridy = 4; c.gridx = 3; c.gridheight = 2; c.ipady = 26; subpanel.add(bplus, c);
和2最後一排一次英寸
c.gridwidth = 1; c.gridy = 3; c.gridx = 3; c.gridheight = 2; c.ipady = 26; subpanel.add(bplus, c);
這裏是GUI的孔代碼，如果你想測試它，也許你不得不調整爲主。
package gui;
import classes.Rechner;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
/**
* Created by tq67 on 17.07.2014.
*/
public class CalculatorGUI extends JFrame {
public static void main(String[] args) {
CalculatorGUI gui = new CalculatorGUI();
gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gui.setVisible(true);
}
public CalculatorGUI() {
setTitle("Calculator");
setBounds(300, 300, 220, 225);
JPanel subpanel = new JPanel();
JPanel headpanel = new JPanel();
final JTextField input = new JTextField();
input.addKeyListener(new KeyListener() {
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyPressed(KeyEvent e) {
}
@Override
public void keyReleased(KeyEvent e) {
if (10 == e.getKeyCode()) {
Rechner rechner = new Rechner(input.getText());
input.setText(rechner.rechnen().toPlainString());
}
if (27 == e.getKeyCode()) {
input.setText("");
}
}
});
ActionListener buttonListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
input.setText(input.getText() + e.getActionCommand());
}
};
ActionListener resultListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("=")) {
Rechner rechner = new Rechner(input.getText());
input.setText(rechner.rechnen().toPlainString());
} else {
input.setText("");
}
}
private void calc() {
Rechner rechner = new Rechner(input.getText());
input.setText(rechner.rechnen().toPlainString());
}
};
JButton b1 = new JButton("1");
JButton b2 = new JButton("2");
JButton b3 = new JButton("3");
JButton b4 = new JButton("4");
JButton b5 = new JButton("5");
JButton b6 = new JButton("6");
JButton b7 = new JButton("7");
JButton b8 = new JButton("8");
JButton b9 = new JButton("9");
JButton b0 = new JButton("0");
JButton bdot = new JButton(".");
JButton bplus = new JButton("+");
JButton bminus = new JButton("-");
JButton bdiv = new JButton("/");
JButton bmult = new JButton("*");
JButton bresult = new JButton("=");
JButton bcancel = new JButton("C");
b1.addActionListener(buttonListener);
b2.addActionListener(buttonListener);
b3.addActionListener(buttonListener);
b4.addActionListener(buttonListener);
b5.addActionListener(buttonListener);
b6.addActionListener(buttonListener);
b7.addActionListener(buttonListener);
b8.addActionListener(buttonListener);
b9.addActionListener(buttonListener);
b0.addActionListener(buttonListener);
bdot.addActionListener(buttonListener);
bplus.addActionListener(buttonListener);
bminus.addActionListener(buttonListener);
bdiv.addActionListener(buttonListener);
bmult.addActionListener(buttonListener);
bresult.addActionListener(resultListener);
bcancel.addActionListener(resultListener);
headpanel.setLayout(new GridBagLayout());
subpanel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 1;
c.weighty = 3;
c.gridx = 0;
c.gridy = 0;
c.ipady = 10;
headpanel.add(input, c);
setLayout(new BorderLayout());
add(headpanel, BorderLayout.NORTH);
add(subpanel, BorderLayout.SOUTH);
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 0;
c.gridx = 0;
c.gridy = 0;
subpanel.add(b7, c);
c.gridx++;
subpanel.add(b8, c);
c.gridx++;
subpanel.add(b9, c);
c.gridx++;
subpanel.add(bmult, c);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 1;
subpanel.add(b4, c);
c.gridx++;
subpanel.add(b5, c);
c.gridx++;
subpanel.add(b6, c);
c.gridx++;
subpanel.add(bdiv, c);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 2;
subpanel.add(b1, c);
c.gridx++;
subpanel.add(b2, c);
c.gridx++;
subpanel.add(b3, c);
c.gridx++;
subpanel.add(bminus, c);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridheight = 1;
c.ipady = 0;
c.gridx = 0;
c.gridy = 3;
subpanel.add(bdot, c);
c.gridwidth = 2;
c.gridx++;
subpanel.add(b0, c);
c.gridwidth = 1;
c.gridx = 3;
c.gridheight = 2;
c.ipady = 26;
subpanel.add(bplus, c);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridwidth = 1;
c.ipady = 0;
c.gridx = 0;
c.gridy = 4;
subpanel.add(bcancel, c);
c.gridx = 1;
c.gridwidth = 2;
subpanel.add(bresult, c);
}
}
我讀到這裏的＃1，當你烏斯的gridx是更大然後0你將有gridheight問題的錯誤...
此刻的GUI看起來像這樣：
Thx for your help。
THX很多！我的TF不會接受輸入代碼:(如果我不實現像這樣......但我會嘗試用KeyEvent的...您的解決方案，是KeyEvent的 – Synoon
它將解決方案的優勢，你需要添加['ActionListener'到外地（http://docs.oracle.com/javase/tutorial/uiswing/events/actionlistener.html）（和[如何使用文本字段（http://docs.oracle .COM/JavaSE的/教程/ uiswing /組件/ textfield.html）。使用'KeyEvent.VK_ *'方法的優點是它是如何想使用，實際的硬件按鍵行程是由Java的轉換爲虛擬鍵表示 – MadProgrammer
我也擺脫了c.ipady表達是非常不現實..的存在有一個簡單的方法來做到這一點沒有？ – Synoon