機器人類mouseWheel不工作

Question

我一直在模擬鼠標事件與Robot類一段時間，一切都很好，直到我試圖使用mouseWheel函數滾動。我只是有這個簡單的一行：

Robot robot = new Robot(); 
    robot.mouseWheel(-100); 

我一直在嘗試了很久的這個變化，並在程序運行時，什麼都不做，然後正常終止。有人可以闡明這是爲什麼嗎？

謝謝！

Answer 1

程序可能無法正常工作，因爲無論有什麼好scroll up在您的鼠標指針休息的GUI上。或者，您還沒有將鼠標指針放置在可以看到滾動效果的相應GUI上。這是實現這個目標的簡單程序。我希望這將有你的幫助：

import javax.swing.*; 
import java.awt.event.*; 
import java.io.*; 
import java.awt.*; 

public class MouseScrollRobot extends JFrame 
{ 

    JTextArea ta; 
    boolean scrolledAway = false; 
    Robot robot; 
    boolean started = false; 
    public void createAndShowGUI() 
    { 
     setTitle("Robot Demonstration"); 
     JPanel panel = new JPanel(); 
     ta = new JTextArea(); 
     StringBuilder sBuilder = new StringBuilder(); 
     try 
     { 
      robot = new Robot(); 
      BufferedReader bfr = new BufferedReader(new FileReader("MouseScrollRobot.java")); 
      String line = null ; 
      while ((line = bfr.readLine()) !=null) 
      { 
       sBuilder.append(line+"\n"); 
      } 
     } 
     catch (Exception ex){ex.printStackTrace();} 
     ta.setText(sBuilder.toString()); 
     JScrollPane jsp = new JScrollPane(ta); 
     final Timer timer = new Timer(100, new ActionListener() 
     { 
      @Override 
      public void actionPerformed(ActionEvent evt) 
      { 
       try 
       { 
        robot.mouseMove((getLocationOnScreen().x + getWidth())/2 , (getLocationOnScreen().y + getHeight())/2);//Move mouse pointer to the Component which you want to scroll 
        ta.requestFocus(); 
        robot.setAutoDelay(100); 
        if (!scrolledAway) 
        { 
         setTitle("Scrolling up"); 
         robot.mouseWheel(-40); 
        } 
        else 
        { 
         setTitle("Scrolling Down"); 
         robot.mouseWheel(40); 
        } 
        scrolledAway = !scrolledAway; 
        setTitle("Scrolled"); 
       }catch (Exception ex){ex.printStackTrace();} 
      } 
     }); 
     timer.setRepeats(true); 
     timer.start(); 
     getContentPane().add(jsp); 
     setSize(500,400); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setLocationRelativeTo(null); 
     setVisible(true); 
    } 

    public static void main(String args[]) 
    { 
    SwingUtilities.invokeLater(new Runnable() 
    { 
     @Override 
     public void run() 
     { 
      MouseScrollRobot msr = new MouseScrollRobot(); 
      msr.createAndShowGUI(); 
     } 
    }); 
    } 
} 

Answer 2

這工作得很好，我...

import java.awt.AWTException; 
import java.awt.Robot; 

public class TestRobotScroll { 

    public static void main(String[] args) { 
     try { 
      Robot bot = new Robot(); 
      bot.setAutoDelay(100); 
      Thread.sleep(2000); 
      System.out.println("++"); 
      bot.mouseWheel(25); 
      Thread.sleep(2000); 
      System.out.println("--"); 
      bot.mouseWheel(-25); 
     } catch (Exception ex) { 
      ex.printStackTrace(); 
     } 
    } 

} 

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