登录框注册按钮点击改变窗口大小——出现注册面板
首先用swt可视化设计登录窗口如下图：
此时窗口高度为578
没点击注册时高度为301（可自己定）
注意：注册用户的Jpanel 的border选择Title Border,title属性是“注册用户”
布局Layout选择Absolute Layout
接着，对话框窗口设计好后，双击注册按钮，进行代码编辑，在注册按钮的监听代码中增加一个if判断，当等于301，就给改为窗口高度578，否则改为301
因为使用的是匿名内部类，不能直接使用this.关键字调用getHeight()方法和setHeight()方法，所以用LoginDialog.this.的方法进行调用
完整代码如下：
package com.swift;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.TitledBorder;
public class LoginDialog extends JDialog {
private JPasswordField passwordField_2;
private JPasswordField passwordField_1;
private JTextField textField_2;
private JTextField textField;
public static void main(String args[]) {
JFrame.setDefaultLookAndFeelDecorated(true);
JDialog.setDefaultLookAndFeelDecorated(true);
try {
UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (InstantiationException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IllegalAccessException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (UnsupportedLookAndFeelException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
LoginDialog dialog = new LoginDialog();
dialog.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
dialog.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public LoginDialog() {
super();
setResizable(false);
setTitle("在线聊天登录框");
getContentPane().setLayout(null);
setBounds(100, 100, 427, 301);//注册时高度为578，不注册是301
final JButton button_1 = new JButton();
button_1.setText("登录");
button_1.setBounds(230, 222, 106, 36);
getContentPane().add(button_1);
final JTextField textField_1 = new JTextField();
textField_1.setBounds(148, 90, 192, 42);
getContentPane().add(textField_1);
final JLabel label = new JLabel();
label.setText("帐 号");
label.setBounds(76, 102, 66, 18);
getContentPane().add(label);
final JLabel label_1 = new JLabel();
label_1.setText("密 码");
label_1.setBounds(76, 167, 66, 18);
getContentPane().add(label_1);
final JPasswordField passwordField = new JPasswordField();
passwordField.setBounds(148, 155, 192, 42);
getContentPane().add(passwordField);
final JButton button = new JButton();
button.addActionListener(new ActionListener() {
public void actionPerformed(final ActionEvent e) {
if(LoginDialog.this.getHeight()==301) {//使用LoginDialog.this.的方法调用，判断高度，前边有setResizable(false);
LoginDialog.this.setSize(427, 578);
}else {
LoginDialog.this.setSize(427, 301);
}
}
});
button.setText("注册");
button.setBounds(76, 222, 106, 36);
getContentPane().add(button);
final JPanel panel = new JPanel();
panel.setLayout(null);
panel.setBorder(new TitledBorder(null, "注册用户", TitledBorder.DEFAULT_JUSTIFICATION, TitledBorder.DEFAULT_POSITION, null, null));
panel.setBounds(10, 278, 401, 226);
getContentPane().add(panel);
final JLabel label_2 = new JLabel();
label_2.setBounds(44, 41, 65, 18);
label_2.setText("手机号：");
panel.add(label_2);
textField = new JTextField();
textField.setBounds(115, 35, 225, 30);
panel.add(textField);
final JButton button_2 = new JButton();
button_2.setText("发送验证");
button_2.setBounds(243, 75, 97, 30);
panel.add(button_2);
textField_2 = new JTextField();
textField_2.setBounds(115, 104, 95, 30);
panel.add(textField_2);
final JLabel label_3 = new JLabel();
label_3.setText("验证码：");
label_3.setBounds(44, 110, 65, 18);
panel.add(label_3);
passwordField_1 = new JPasswordField();
passwordField_1.setBounds(115, 143, 231, 30);
panel.add(passwordField_1);
passwordField_2 = new JPasswordField();
passwordField_2.setBounds(115, 175, 231, 30);
panel.add(passwordField_2);
final JLabel label_4 = new JLabel();
label_4.setText("密 码：");
label_4.setBounds(44, 149, 65, 18);
panel.add(label_4);
final JLabel label_5 = new JLabel();
label_5.setText("验证密码：");
label_5.setBounds(44, 181, 65, 18);
panel.add(label_5);
final JButton button_3 = new JButton();
button_3.setBounds(47, 510, 97, 30);
getContentPane().add(button_3);
button_3.setText("放弃");
final JButton button_4 = new JButton();
button_4.setBounds(262, 510, 97, 30);
getContentPane().add(button_4);
button_4.setText("注册用户");
}
}
实现打开登录框时屏幕居中
因屏幕居中的功能，其他窗口也需要，所以见一个工具类
原理是获得屏幕的宽度和高度
分别减去对话框的宽度和高度
然后除以2
就是窗口居中的那个点——Point
首先，制作一个类com.swift.util.Center
里边有一个方法getPoint(int width,int height)
和一个包装的重载方法，方便调用
getPoint(Dimension d)
全部代码如下：
package com.swift.util;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.Toolkit;
public class Center {
public static Point getPoint(int width,int height) {
Toolkit toolkit=Toolkit.getDefaultToolkit();//应该是单例
int screenW=toolkit.getScreenSize().width;
int screenH=toolkit.getScreenSize().height;
int x=(screenW-width)/2;
int y=(screenH-height)/2;
Point p=new Point(x,y);
return p;
}
//函数的重载，参数是包装类尺寸——Dimension
public static Point getPoint(Dimension d) {
Point p=getPoint(d.width,d.height);
return p;
}
}
使用居中的工具类
this.setLocation(Center.getPoint(this.getSize()));
在设置对话框宽度高度后，重新设置窗口位置
LoginDialog.this.setLocation(Center.getPoint(LoginDialog.this.getSize()));
匿名内部类中，当点击注册按钮，窗口被重新改变大小之后，也要不断改变窗口位置，内部类使用LoginDialog.this.
全部代码修改如下：
package com.swift;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.TitledBorder;
import com.swift.util.Center;
public class LoginDialog extends JDialog {
private JPasswordField passwordField_2;
private JPasswordField passwordField_1;
private JTextField textField_2;
private JTextField textField;
public static void main(String args[]) {
JFrame.setDefaultLookAndFeelDecorated(true);
JDialog.setDefaultLookAndFeelDecorated(true);
try {
UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (InstantiationException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IllegalAccessException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (UnsupportedLookAndFeelException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
LoginDialog dialog = new LoginDialog();
dialog.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
dialog.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public LoginDialog() {
super();
setResizable(false);
setTitle("在线聊天登录框");
getContentPane().setLayout(null);
setBounds(100, 100, 427, 301);//注册时高度为578，不注册是301
//设置窗口居中
this.setLocation(Center.getPoint(this.getSize()));
final JButton button_1 = new JButton();
button_1.setText("登录");
button_1.setBounds(230, 222, 106, 36);
getContentPane().add(button_1);
final JTextField textField_1 = new JTextField();
textField_1.setBounds(148, 90, 192, 42);
getContentPane().add(textField_1);
final JLabel label = new JLabel();
label.setText("帐 号");
label.setBounds(76, 102, 66, 18);
getContentPane().add(label);
final JLabel label_1 = new JLabel();
label_1.setText("密 码");
label_1.setBounds(76, 167, 66, 18);
getContentPane().add(label_1);
final JPasswordField passwordField = new JPasswordField();
passwordField.setBounds(148, 155, 192, 42);
getContentPane().add(passwordField);
final JButton button = new JButton();
button.addActionListener(new ActionListener() {
public void actionPerformed(final ActionEvent e) {
if(LoginDialog.this.getHeight()==301) {
LoginDialog.this.setSize(427, 578);
}else {
LoginDialog.this.setSize(427, 301);
}
//设置窗口不断居中
LoginDialog.this.setLocation(Center.getPoint(LoginDialog.this.getSize()));
}
});
button.setText("注册");
button.setBounds(76, 222, 106, 36);
getContentPane().add(button);
final JPanel panel = new JPanel();
panel.setLayout(null);
panel.setBorder(new TitledBorder(null, "注册用户", TitledBorder.DEFAULT_JUSTIFICATION, TitledBorder.DEFAULT_POSITION, null, null));
panel.setBounds(10, 278, 401, 226);
getContentPane().add(panel);
final JLabel label_2 = new JLabel();
label_2.setBounds(44, 41, 65, 18);
label_2.setText("手机号：");
panel.add(label_2);
textField = new JTextField();
textField.setBounds(115, 35, 225, 30);
panel.add(textField);
final JButton button_2 = new JButton();
button_2.setText("发送验证");
button_2.setBounds(243, 75, 97, 30);
panel.add(button_2);
textField_2 = new JTextField();
textField_2.setBounds(115, 104, 95, 30);
panel.add(textField_2);
final JLabel label_3 = new JLabel();
label_3.setText("验证码：");
label_3.setBounds(44, 110, 65, 18);
panel.add(label_3);
passwordField_1 = new JPasswordField();
passwordField_1.setBounds(115, 143, 231, 30);
panel.add(passwordField_1);
passwordField_2 = new JPasswordField();
passwordField_2.setBounds(115, 175, 231, 30);
panel.add(passwordField_2);
final JLabel label_4 = new JLabel();
label_4.setText("密 码：");
label_4.setBounds(44, 149, 65, 18);
panel.add(label_4);
final JLabel label_5 = new JLabel();
label_5.setText("验证密码：");
label_5.setBounds(44, 181, 65, 18);
panel.add(label_5);
final JButton button_3 = new JButton();
button_3.setBounds(47, 510, 97, 30);
getContentPane().add(button_3);
button_3.setText("放弃");
final JButton button_4 = new JButton();
button_4.setBounds(262, 510, 97, 30);
getContentPane().add(button_4);
button_4.setText("注册用户");
}
}
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