GUI编程(AWT_03)

7.Paint画笔

package com.deng.lesson03;

import java.awt.*;

public class TestPaint {
    public static void main(String[] args) {
        new MyPaint().loadFrame();
    }
}
class MyPaint extends Frame {

    public void loadFrame(){
        setBounds(200,200,600,500);
        setVisible(true);
    }
    //画笔
    @Override
    public void paint(Graphics g) {
        //画笔 需要有颜色；可以画画
        //g.setColor(Color.red);
        //g.drawOval(100,100,100,100);
        g.fillOval(100,100,100,100);//实习的圆

        //g.setColor(Color.GREEN);
        g.fillRect(150,200,200,200);

        //养成习惯，画笔用完，将他还原到最初的颜色 黑色
    }
}

8.鼠标监听

目的：想要实现鼠标画画

package com.deng.lesson03;

import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
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");

    }
}

//自己的类
class MyFrame extends Frame {
    //画画需要画笔，需要监听鼠标当前的位置，需要集合来存储这个点
    ArrayList points;

    public MyFrame(String title) {
        super(title);
        setBounds(200, 200, 400, 300);

        //存鼠标点击的点
        points = new ArrayList<>();
        setVisible(true);
        //鼠标监听器，正对这个窗口
        this.addMouseListener(new MyMouseListener());
    }

    @Override
    public void paint(Graphics g) {
        //画画，监听鼠标的事件
        Iterator iterator = points.iterator();
        while (iterator.hasNext()) {
            Point point = (Point) iterator.next();
            g.setColor(Color.BLUE);
            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);
    }


    //适配器模式
    private class MyMouseListener extends MouseAdapter {
        //鼠标 按下，弹起，按住不放
        @Override
        public void mousePressed(MouseEvent e) {
            MyFrame frame = (MyFrame) e.getSource();
            //这里我们点击的时候，就会在界面产生一个点！画
            //这个点就是鼠标的点
            frame.addPaint(new Point(e.getX(),e.getY()));

            //每次点击鼠标都需要重新画一遍
            frame.repaint();//刷新
        }
    }
}

9.窗口监听

package com.deng.lesson03;

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class TestWindow {
    public static void main(String[] args) {
        new WindowFrame();
    }
}

class WindowFrame extends Frame {
    public WindowFrame() {
        setBackground(Color.BLUE);
        setVisible(true);
        setBounds(100, 100, 100, 100);
        //addWindowListener(new MyWindowListener());

        this.addWindowListener(
                //匿名内部类
                new WindowAdapter() {
                    //关闭窗口
                    @Override
                    public void windowClosing(WindowEvent e) {
                        System.out.println("windowClosing");
                        System.exit(0);
                    }

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

/*    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
        }
    }*/
}

10.键盘监听

package com.deng.lesson03;

import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.security.Key;

//键
public class TestKeyListener {
    public static void main(String[] args) {
        new KeyFrame();
    }
}
class KeyFrame extends Frame{
    public KeyFrame(){
        setBounds(1,2,300,400);
        setVisible(true);

        this.addKeyListener(new KeyAdapter() {
            //键盘按下
            @Override
            public void keyPressed(KeyEvent e) {
                //获得键盘下的键是哪一个，当前的码
                int keyCode=e.getKeyCode();//不需要去记录这个数值，直接使用静态属性VK_***
                System.out.println(keyCode);
                if(keyCode==KeyEvent.VK_UP){
                    System.out.println("你按下了上键");
                }
                //根据按下不同操作，产生不同结果
            }
        });
    }
}