Swing jtextArea scrollbar and text zoom effect

This article shares the specific code for the swing jtextArea scrollbar and text zoom with everyone for reference, the specific content is as follows

When a jtextArea with a scrollbar is added scrolling events such as zooming with Ctrl+When the scrolling and zooming events are added at the same time during wheeling, how can we ensure that these two events occur simultaneously without interfering with each other? That is, the text does not scroll up and down when the scrollbar zooms in and out.

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.MouseAdapter; 
import java.awt.event.MouseWheelEvent; 
import java.awt.event.MouseWheelListener; 
public class jtaWheel { 
  JFrame jf; 
  JTextArea jta; 
  JScrollPane jsp; 
  MouseWheelListener sysWheel; 
  public jtaWheel(){ 
    jf = new JFrame("Scroll Zoom"); 
    jf.setBounds(500,500,600,400); 
    jta = new JTextArea(); 
    jsp = new JScrollPane(jta,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, 
        JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED); 
    sysWheel = jsp.getMouseWheelListeners()[0];//Get system scrolling event 
    jsp.removeMouseWheelListener(sysWheel);//Remove system scrolling, add when needed 
    jsp.addMouseWheelListener(new event()); 
    jf.add(jsp); 
    jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    jf.setVisible(true); 
  } 
  private class event extends MouseAdapter{ 
    @Override 
    public void mouseWheelMoved(MouseWheelEvent e){ 
      if(e.isControlDown()){//When the ctrl key is pressed, the scroll is zoomed in and out 
        Font f = jta.getFont(); 
        if(e.getWheelRotation()<0){//If the scrollbar scrolls forward, the text is enlarged 
          jta.setFont(new Font(f.getFamily(),f.getStyle(),f.getSize())+1)); 
        }//The scrollbar scrolls back to shrink the text 
          jta.setFont(new Font(f.getFamily(),f.getStyle(),f.getSize())-1)); 
        } 
      }//If the ctrl key is not pressed, it is a system scroll 
        jsp.addMouseWheelListener(sysWheel); 
        sysWheel.mouseWheelMoved(e);//Trigger the system scroll event. 
        jsp.removeMouseWheelListener(sysWheel); 
      } 
    } 
  } 
  public static void main(String[] args){ 
    new jtaWheel(); 
  } 
} 

That's all for this article. I hope it will be helpful to everyone's learning and that everyone will support the Yelling Tutorial more.

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