GUI基礎學習二

2.1畫筆

package paint;

import java.awt.*;

public class Painting {
    public static void main(String[] args) {
        new MyPaint().loadFrame();
    }
}
class MyPaint extends Frame{
    public void loadFrame(){
        setBounds(200,200,400,500);
        setVisible(true);
    }
    @Override
    public void paint(Graphics g) {
        g.setColor(Color.red);
        //g.drawOval(100,100,100,100);
        g.fillOval(100,100,100,100);
        g.setColor(Color.GREEN);
        g.fillRect(200,100,100,100);
        //使用完畫筆后最好重置畫筆顏色
        g.setColor(Color.black);
    }
}

2.2滑鼠監聽

目的：實作滑鼠繪畫

package paint;

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

public class TestMouse {
    public static void main(String[] args) {
        new MyFrame("畫圖");
    }
}
class MyFrame extends Frame{
    ArrayList arrayList;
    //畫畫需要畫筆，需要監聽當前滑鼠的位置，需要集合來儲存這個點

    public MyFrame(String title) {
        super(title);
        //設定畫板位置和大小
        setBounds(200,200,400,400);
        //存盤滑鼠點擊的點
        arrayList=new ArrayList<>();

        //滑鼠監聽器，正對這個視窗
        this.addMouseListener(new MyMouseListener());

        setVisible(true);
    }

    @Override
    public void paint(Graphics g) {
        //畫畫，監聽滑鼠的事件
        Iterator iterator=arrayList.iterator();
        while(iterator.hasNext()){
            Point point=(Point) iterator.next();
            g.setColor(Color.BLUE);
            g.fillOval(point.x,point.y,10,10);
        }
    }

    //添加一個點到界面上
    public void addPaint(Point point){
        arrayList.add(point);
    }
    private class MyMouseListener extends MouseAdapter{
        //s滑鼠：按下 彈起 按住不放
        @Override
        public void mousePressed(MouseEvent e) {
            MyFrame myFrame=(MyFrame) e.getSource();
            //當我們點擊產生一個點
            myFrame.addPaint(new Point(e.getX(),e.getY()));

            //每次點擊滑鼠都需要重新畫一遍
            myFrame.repaint();
        }
    }
}

2.3視窗監聽

package paint;

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() {
        setVisible(true);
        setBounds(100,100,300,300);
        setBackground(Color.blue);
        //addWindowListener(new MyWindowListener());
        this.addWindowListener(
                //匿名內部類
                new WindowAdapter() {
                    
                    @Override
                    public void windowClosing(WindowEvent e) {
                        //g關閉視窗
                        System.out.println("windowClosing");
                        System.exit(0);
                    }
                    
                    @Override
                    public void windowActivated(WindowEvent e) {
                        //激活視窗
                        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);//隱藏視窗
//            System.exit(0);//正常退出
//        }
//    }

2.4鍵盤監聽

package paint;

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

public class TestKeyListener {
    public static void main(String[] args) {
        new KeyFrame();
    }
static class KeyFrame extends Frame{
        public KeyFrame()  {
            setBounds(100,100,300,300);
            setVisible(true);

            this.addKeyListener(new KeyAdapter() {
                //鍵盤按下
                @Override
                public void keyPressed(KeyEvent e) {
                    //獲得鍵盤按下的鍵是哪一個,獲取當前建的碼
                    int keycode=e.getKeyCode();
                    System.out.println(keycode);
                    if (keycode==KeyEvent.VK_UP){
                        System.out.println("你按下了上建");
                    }
                    //根據按下不同操作，產生不同的結果：
                }
            });
        }
    }
}

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