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GUI

GUI

事件监听

当某个事情发生的时候,干什么?

package com.yu.lesson02;

import java.awt.*;
import java.awt.event.*;
public class TestActionEvent {
    public static void main(String[] args) {
        //按下按钮触发一些事件
        Frame frame = new Frame();
        Button button = new Button();
        //因为addActionListener()需要一个ActionListener,所以我们需要构建一个ActionListener
        MyActionListener myActionListener = new MyActionListener();
        button.addActionListener(myActionListener);
        frame.add(button,BorderLayout.CENTER);
        frame.setVisible(true);
        frame.pack();
        windowClose(frame);
    }
    //关闭窗口事件
    private static void windowClose(Frame frame){
        frame.addWindowListener(new WindowAdapter(){
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
    static class MyActionListener implements ActionListener{
        @Override
        public void actionPerformed(ActionEvent e) {
            System.out.println("aaa");
        }
    }
}

多个按钮共享一个事件

package com.yu.lesson02;

import java.awt.*;
import java.awt.event.*;
public class TestActiontwo {
    public static void main(String[] args) {
        //两个按钮实现同一个监听
        //开始    停止
        Frame frame = new Frame();
        Button start = new Button("start");
        Button stop = new Button("stop");
        //可以定义触发会返回的命令,如果没写则显示默认名label
        //可以多个按钮只写一个监听类
        stop.setActionCommand("button_stop");
        MyMOnitor myMOnitor = new MyMOnitor();
        start.addActionListener(myMOnitor);
        stop.addActionListener(myMOnitor);
        frame.add(start,BorderLayout.SOUTH);
        frame.add(stop,BorderLayout.NORTH);
        frame.pack();
        frame.setVisible(true);
    }
    static class MyMOnitor implements ActionListener{
        @Override
        public void actionPerformed(ActionEvent e) {
            //e.getActionCommand()获得按钮信息
            System.out.println("按钮被点击了:msg=> "+e.getActionCommand());
        }
    }
}

输入框(text field) 事件监听

text field 文本框

密码框

package com.yu.lesson02;

import java.awt.*;
import java.awt.event.*;
public class TestText {
    public static void main(String[] args) {
        //main只管启动
        new MyFrame();
    }
}
class MyFrame extends Frame{
    public MyFrame(){
        TextField textField = new TextField();
        add(textField);
        //监听这个文本框输入的文字
        MyActionListener myActionListener = new MyActionListener();
        //按下Enter 就会触发这个输入框的事件
        textField.addActionListener(myActionListener);

        //设置替换编码
        textField.setEchoChar('*');
        pack();
        setVisible(true);
        addWindowListener(new WindowAdapter(){
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
    }
class MyActionListener implements ActionListener{
    @Override
    public void actionPerformed(ActionEvent e) {
        TextField field = (TextField)e.getSource();//获得一些资源,返回的一个对象Object
        //获得输入框中的文本
        System.out.println(field.getText());
        field.setText("");
    }
}

简易计算器,组合+内部类回顾复习

oop原则: 组合,大于继承!

第一代

package com.yu.lesson02;

import java.awt.*;
import java.awt.event.*;

//简易计算器
public class TextCalc {
    public static void main(String[] args) {
        new Calculator();
    }
}
//计算器类
class Calculator extends Frame{
    public Calculator(){
        //三个文本框
        TextField num1 = new TextField(10);
        TextField num2 = new TextField(10);
        TextField num3 = new TextField(20);
        //一个按钮
        Button button = new Button("=");
        button.addActionListener(new MyCalculatorListener(num1,num2,num3));
        //一个标签
        Label label = new Label("+");
        setLayout(new FlowLayout());
        add(num1);
        add(label);
        add(num2);
        add(button);
        add(num3);
        pack();
        setVisible(true);
    }
}
//监听器
class MyCalculatorListener implements ActionListener{
    private TextField num1,num2,num3;

    public MyCalculatorListener(TextField num1, TextField num2, TextField num3) {
        this.num1 = num1;
        this.num2 = num2;
        this.num3 = num3;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        //1.获得加数被加数
        int n1 = Integer.parseInt(num1.getText());
        int n2 = Integer.parseInt(num2.getText());
        //2.将这个值加法运算后放到第三个框
        num3.setText(""+(n1+n2));
        //3. 清楚前两个框
        num1.setText("");
        num2.setText("");

    }
}

优化:完全改造为面向对象方法

package com.yu.lesson02;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class TextCalc2 {
    public static void main(String[] args) {
        new Calculator1().loadFrame();
    }
}
//计算器类
class Calculator1 extends Frame{
    //属性
    TextField num1,num2,num3;
    //方法
    public void loadFrame(){
        //三个文本框
        num1 = new TextField(10);
        num2 = new TextField(10);
        num3 = new TextField(20);
        //一个按钮
        Button button = new Button("=");
        //一个标签
        Label label = new Label("+");

        button.addActionListener(new MyCalculatorListener1(this));
        //流式布局
        setLayout(new FlowLayout());
        add(num1);
        add(label);
        add(num2);
        add(button);
        add(num3);
        pack();
        setVisible(true);

    }
}
//监听器
class MyCalculatorListener1 implements ActionListener {
    //获取计算器这个对象,在一个类中组合另外一个类:
    Calculator1 calculator1 = null;
    public MyCalculatorListener1(Calculator1 calculator1) {
        this.calculator1 = calculator1;

    }

    @Override
    public void actionPerformed(ActionEvent e) {
        //1.获得加数被加数
        //2.将这个值加法运算后放到第三个框
        //3. 清楚前两个框
        int n1 = Integer.parseInt(calculator1.num1.getText());
        int n2 = Integer.parseInt(calculator1.num2.getText());
        calculator1.num3.setText(""+(n1+n2));
        calculator1.num1.setText("");
        calculator1.num2.setText("");
    }

}

内部类

  • 更好的包装
  • 最大好处畅通无阻的访问外部类
package com.yu.lesson02;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class TextInner {
    public static void main(String[] args) {
        new Calculator1().loadFrame();
    }
}
//计算器类
class Calculator2 extends Frame{
    //属性
    TextField num1,num2,num3;
    //方法
    public void loadFrame(){
        //三个文本框
        num1 = new TextField(10);
        num2 = new TextField(10);
        num3 = new TextField(20);
        //一个按钮
        Button button = new Button("=");
        //一个标签
        Label label = new Label("+");

        button.addActionListener(new MyCalculatorListener2());
        //流式布局
        setLayout(new FlowLayout());
        add(num1);
        add(label);
        add(num2);
        add(button);
        add(num3);
        pack();
        setVisible(true);
    }
    //内部类 监听器
    //内部类最大好处畅通无阻的访问外部类
    class MyCalculatorListener2 implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            //1.获得加数被加数
            //2.将这个值加法运算后放到第三个框
            //3. 清楚前两个框
            int n1 = Integer.parseInt(num1.getText());
            int n2 = Integer.parseInt(num2.getText());
            num3.setText(""+(n1+n2));
            num1.setText("");
            num2.setText("");
        }

    }
}

画笔

package com.yu.lesson03;

import java.awt.*;

public class TestPaint {
    public static void main(String[] args) {
        new MyPaint().loadFrame();
    }
}
class MyPaint extends Frame{
    public void loadFrame(){
        setBounds(200,200,600,400);
        setVisible(true);
    }
    //画笔
    @Override
    public void paint(Graphics g) {
        //画笔 1.颜色
        g.setColor(Color.red);
        //空心⚪
//        g.drawOval(100,100,100,100);
        //实心⚪
        g.fillOval(100,100,100,100);
        g.setColor(Color.GREEN);
        g.fillRect(200,200,200,200);

        //养成习惯,画笔用完,将他还原为最初的颜色
        
    }
}

image-20220505163848865

鼠标监听

想要实现鼠标画画

package com.yu.lesson03;

import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.Iterator;

//鼠标监听事件
public class TestMouseListener {
    public static void main(String[] args) {
        new MyFrame("画图");
    }
}
class MyFrame extends Frame{
    ArrayList points;
    //画画需要画笔,需要监听鼠标当前位置,需要集合来存储这个点
    public MyFrame(String title){
        super(title);
        setBounds(200,200,400,300);
        setVisible(true);
        //存鼠标单击的点
        points = new ArrayList<>();
        //鼠标监听器,针对当前窗口
        this.addMouseListener(new MyMouseListener());
    }

    @Override
    public void paint(Graphics g) {
        //画画,监听鼠标事件
        Iterator iterator = points.iterator();
        while (iterator.hasNext()){
            Point point = (Point) iterator.next();
            g.setColor(Color.GREEN);
            g.fillOval(point.x,point.y,10,10);
        }
    }
    //添加一个点到界面上
    public void addPaint(Point point){
        points.add(point);
    }

    private class MyMouseListener extends MouseAdapter{
        //按下,弹起,按住不放

        @Override
        public void mousePressed(MouseEvent e) {
            MyFrame myFrame = (MyFrame) e.getSource();
            //这里点击时产生一个点
            //鼠标单击的点
            myFrame.addPaint(new Point(e.getX(),e.getY()));

            //每次单击鼠标都需要重新画一遍
            myFrame.repaint();//刷新 
        }
    }
}

image-20220505170651865

窗口监听

package com.yu.lesson03;

import java.awt.event.*;
import java.awt.*;
public class TestWindow {
    public static void main(String[] args) {
        new WindowFrame();
    }
}
class WindowFrame extends Frame {
    public  WindowFrame(){
        setBackground(Color.YELLOW);
        setBounds(100,100,100,200);
//        addWindowListener(new MyWindowListener());
        setVisible(true);
        this.addWindowListener(new WindowAdapter(){
            //显示不出来
            @Override
            public void windowOpened(WindowEvent e) {
                System.out.println("开");
            }

            @Override
            public void windowClosing(WindowEvent e) {
                System.out.println("正在关闭");
                System.exit(0);
            }
            //显示不出来
            @Override
            public void windowClosed(WindowEvent e) {
                System.out.println("已经关闭");
            }

            @Override
            public void windowActivated(WindowEvent e) {
                System.out.println("窗口被激活");
                WindowFrame source = (WindowFrame) e.getSource();
                source.setTitle("windowS");
            }

            @Override
            public void windowDeactivated(WindowEvent e) {
                System.out.println("窗口未被激活");
            }

        });
    }
//    class MyWindowListener extends WindowAdapter{
//        @Override
//        public void windowClosing(WindowEvent e) {
//            setVisible(false);//隐藏窗口,通过按钮,隐藏当前窗口
//            System.exit(0);//正常退出//非正常退出改为1
//        }
//    }
}

键盘监听

 posted on   yulll  阅读(54)  评论(0)  编辑  收藏  举报
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