滑鼠事件

一、滑鼠事件說明
視窗應用程式中，滑鼠是最常使用的輸入工具。Java用滑鼠來處理觸發事件的傾聽機制，方式有「實作MouseListener介面」、「繼承MouseAdapter類別」、「實作MouseMotionListener介面」、「繼承MouseMotionAdapter類別」，在本單元我們將練習實作MouseListener介面。

二、MouseListener介面與MouseAdapter類別皆提供了五個滑鼠事件處理方法
1. void mouseClicked(MouseEvent e)
　當滑鼠鍵被按一下時所觸發的事件，包括按下及放開的過程。
2. void mousePressed(MouseEvent e)
　當滑鼠鍵被按下時所觸發的事件。
3. void mouseReleased(MouseEvent e)
　當已按下的滑鼠鍵被放開時所觸發的事件。
4. void mouseEntered(MouseEvent e)
　當滑鼠指標移入來源物件時所觸發的事件。
5. void mouseExited(MouseEvent e)
　當滑鼠指標從來源物件移出來時所觸發的事件。

三、MouseMotionListener介面與MouseMotionAdapter類別皆提供了二個滑鼠事件處理方法
1. void mouseMoved(MouseEvent e)
　當滑鼠指標在來源物件內移動時所觸發的事件。
2. void mouseDragged(MouseEvent e)
　當滑鼠指標拖曳來源物件時所觸發的事件。

四、MouseEvent類別常用的方法
1. int getX()
　傳回滑鼠指標在視窗物件內的水平座標。
2. int getY()
　傳回滑鼠指標在視窗物件內的垂直座標。
3. int getClickCount()
　傳回滑鼠鍵被按了幾下。
4. int getButton()
　傳回滑鼠被按下或放開的鍵是哪一個按鍵。若傳回1，表示左鍵；傳回2，表示中鍵；傳回3，表示右鍵。

五、實作MouseListener介面
滑鼠事件的「事件來源」就是視窗物件，因此要使用 addMouseListener(this) 敘述將視窗物件與滑鼠事件傾聽者連結在一起。

實作點擊滑鼠左鍵1次後,圖片左上角對準至滑鼠指標位置.

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黃茂勛發表於 2018-3-3 11:48 | 只看該作者

package bbs.istak.org.tw;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class Main extends JFrame {
private JPanel contentPane;
private int x2, y2;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Main frame = new Main();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public Main() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 379);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
ImageIcon icon = new ImageIcon(Main.class.getResource("l02.png"));
JLabel lblNewLabel = new JLabel();
lblNewLabel.setBounds(165, 132, 117, 102);
lblNewLabel.setIcon(icon);
addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
x2 = e.getX()-50;
y2 = e.getY()-70;
if(e.getButton() == 1)
lblNewLabel.setLocation(x2, y2);
}
});
contentPane.add(lblNewLabel);
}
}

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蔡季樺發表於 2018-3-3 11:50 | 只看該作者

package bbs.istak.org.tw;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class Main extends JFrame {
private JPanel contentPane;
private int x,y;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Main frame = new Main();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Main() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblNewLabel = new JLabel("New label");
lblNewLabel.setIcon(new ImageIcon(Main.class.getResource("/bbs/istak/org/tw/kd001.png")));
lblNewLabel.setBounds(114, 83, 102, 102);
contentPane.add(lblNewLabel);
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent arg0) {
x = arg0.getX();
y = arg0.getY();
lblNewLabel.setLocation(x-51,y-51);
}
});
}
}

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蔡庭豪發表於 2018-3-3 12:01 | 只看該作者

package bbs.istak.org.tw;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class Amove extends JFrame {
private JPanel contentPane;
private ImageIcon icon;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Amove frame = new Amove();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Amove() {
icon = new ImageIcon(crocodile.class.getResource("A-icon.png"));
Image img = icon.getImage().getScaledInstance(32,32,java.awt.Image.SCALE_FAST );
ImageIcon newicon = new ImageIcon(img);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel Alabel = new JLabel(newicon);
Alabel.setBounds(144, 70, 32, 32);
contentPane.add(Alabel);
addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent arg0) {
int x = arg0.getX();
int y = arg0.getY();
Alabel.setLocation(x, y);
}
});
}
}

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張健勳發表於 2018-3-4 21:48 | 只看該作者

本帖最後由張健勳於 2018-3-4 22:22 編輯

package bbs.istak.org.tw;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import java.awt.Toolkit;
import javax.swing.ImageIcon;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class Main extends JFrame {
private JPanel contentPane;
private int x,y;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Main frame = new Main();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Main() {
setIconImage(Toolkit.getDefaultToolkit().getImage(Main.class.getResource("icon.png")));
setTitle("\u6ED1\u9F20\u6307\u6A19\u727D\u5F15\u5716\u6848");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lb = new JLabel("");
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent a) {
x = a.getX();
y = a.getY();
lb.setLocation(x,y);
}
});
lb.setIcon(new ImageIcon(Main.class.getResource("icon.png")));
lb.setBounds(10, 10, 89, 79);
contentPane.add(lb);
}
}

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