Java API 分類導覽 - java.awt.event.MouseMotionListener mouseDragged()

MouseMotionListener 介面 (interface) 的 mouseDragged() 方法 (method) 用來設定滑鼠拖曳的動作。



修飾子與參數

void mouseDragged(MouseEvent e)

mouseDragged() 沒有回傳值 (return value) ，參數 (paramenter) 為 MouseEvent 型態 (type) 的物件 (object) 。


舉例如下

import java.awt.*;
import java.awt.event.*;
 
public class MouseAdapterDemo extends MouseAdapter {
    Frame frame;
    Panel panel;
    Label text;
    
    public static void main(String[] args) {
        new MouseAdapterDemo();
    }
     
    public MouseAdapterDemo() {
        frame = new Frame("AWTDemo");
        frame.addWindowListener(new AdapterDemo());
        frame.setSize(600, 400);
        
        panel = new Panel();
        panel.addMouseListener(this);
        panel.addMouseWheelListener(this);
        panel.addMouseMotionListener(this);
        
        text = new Label("something happened..");
        
        panel.add(text);
        frame.add(panel, BorderLayout.CENTER);
        frame.setVisible(true);
    }
    
    // from MouseListener
    public void mouseClicked(MouseEvent e) {
        text.setText("mouseClicked");
        System.out.println("mouseClicked");
    }
    
    public void mousePressed(MouseEvent e) {
        text.setText("mousePressed");
        System.out.println("mousePressed");
    }
    
    public void mouseReleased(MouseEvent e) {
        text.setText("mouseReleased");
        System.out.println("mouseReleased");
    }
    
    public void mouseEntered(MouseEvent e) {
        text.setText("mouseEntered");
        System.out.println("mouseEntered");
    }
    
    public void mouseExited(MouseEvent e) {
        text.setText("mouseExited");
        System.out.println("mouseExited");
    }

    // from MouseWheelListener
    public void mouseWheelMoved(MouseWheelEvent e) {
        text.setText("mouseWheelMoved");
        System.out.println("mouseWheelMoved");
    }

    // from MouseMotionListener
    public void mouseDragged(MouseEvent e) {
        text.setText("mouseDragged");
        System.out.println("mouseDragged");
    }
    
    public void mouseMoved(MouseEvent e) {
        text.setText("mouseMoved");
        System.out.println("mouseMoved");
    }
}
 
class AdapterDemo extends WindowAdapter {
    public void windowClosing(WindowEvent e) {
        System.exit(0);
    }
}

/* 《程式語言教學誌》的範例程式
    http://pydoing.blogspot.com/
    檔名：MouseAdapterDemo.java
    功能：示範 Java 程式 
    作者：張凱慶
    時間：西元 2012 年 3 月 */

此例的 MouseAdapterDemo 直接繼承自 MouseAdapter 類別， MouseAdapter 已經實作 MouseMotionListener 介面

public class MouseAdapterDemo extends MouseAdapter {

MouseMotionListener 的 mouseDragged() 處理滑鼠拖曳的動作，所謂拖曳是指按住滑鼠按鈕然後同時移動滑鼠， mouseMoved() 則為處理滑鼠移動的動作

// from MouseMotionListener
public void mouseDragged(MouseEvent e) {
    text.setText("mouseDragged");
    System.out.println("mouseDragged");
}
    
public void mouseMoved(MouseEvent e) {
    text.setText("mouseMoved");
    System.out.println("mouseMoved");
}

編譯後執行，結果如下

中英文術語對照
介面	interface
方法	method
回傳值	return value
型態	type
物件	object
參數	parameter

您可以繼續參考

事件處理

• 類別
• ActionEvent
• AdjustmentEvent
• ItemEvent
• KeyAdapter
• KeyEvent
• MouseAdapter
• MouseEvent
• MouseMotionAdapter
• MouseWheelEvent
• TextEvent
• WindowAdapter
• WindowEvent
• 介面
• ActionListener
• AdjustmentListener
• ItemListener
• KeyListener
• MouseListener
• MouseMotionListener
• MouseWheelListener
• TextListener
• WindowFocusListener
• WindowListener
• WindowStateListener

相關目錄

Java API 分類導覽
Java 教材
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參考資料

http://docs.oracle.com/javase/6/docs/api/java/awt/event/MouseMotionListener.html