如何在特定時間後調用repaint（）方法

Question

我想更新工具提示，所以我認爲在使用重繪方法時，每隔30秒重新繪製一次幀，但不起作用。有人可以helpme ..

GrphicsTut方法

import java.awt.Color; 
import java.awt.Font; 
import java.awt.Graphics; 
import java.awt.Image; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.Timer; 
import javax.swing.ImageIcon; 
import javax.swing.JFrame; 

public class GrphicsTut extends JFrame{ 
    Timer timer; 
    Image image; 
    Image image2; 
    int x1,y1,x2,y2; 
    Font fonte = new Font("TimesRoman ",Font.BOLD,100); 

    public GrphicsTut(){ 
     MouseListenerJ bkg = new MouseListenerJ(); 
     this.setTitle("Remember g for Graphics"); 
     this.setSize(600,500); 
     this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     this.setVisible(true); 
     this.addMouseMotionListener(bkg); 
     this.addMouseListener(bkg); 
     this.add(bkg); 
    } 

    public void paint(Graphics gr){ 
     gr.setFont(fonte); 
     gr.setColor(Color.black); 
     gr.drawLine(35,35, 410, 110); 
     gr.drawLine(410,110, 310, 410); 
     ImageIcon i=new ImageIcon("image/1005511030.jpg"); 
     image=i.getImage(); 
     gr.drawImage(image, 35, 35,null); 
     gr.drawImage(image, 400, 100,null); 
     gr.drawImage(image, 300, 400,null); 
     repaint(); 
    } 

    public static void main(String[] args) { 
     new GrphicsTut(); 
    } 
} 

這裏的方法MouseListner

package Carte; 
import java.awt.Graphics; 
import java.awt.Image; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 
import java.awt.event.MouseMotionListener; 
import javax.swing.ImageIcon; 
import javax.swing.JOptionPane; 
import javax.swing.JPanel; 
public class MouseListenerJ extends JPanel implements MouseListener, MouseMotionListener { 
    public MouseListenerJ(){} 
    public void paint(Graphics g){} 

    @Override 
    public void mouseClicked(MouseEvent me) { 
     // TODO Auto-generated method stub 
     if(me.getX()>=35 && me.getX()<=70 && me.getY()>=35 &&me.getY()<=70){ 
      //JOptionPane.showMessageDialog(null,"Que voulez vous faire"); 
      new Carte1(); 
     }  
    } 

    @Override 
    public void mouseEntered(MouseEvent me) { 
     // TODO Auto-generated method stub 
     //System.out.println("Entered at x "+me.getX()); 
    } 

    @Override 
    public void mouseExited(MouseEvent me) { 
     // TODO Auto-generated method stub 
     //System.out.println("Exited"); 
    } 

    @Override 
    public void mousePressed(MouseEvent me) { 
     // TODO Auto-generated method stub 
     System.out.println("Pressed at : "+me.getX()+" "+me.getY()); 
    } 

    @Override 
    public void mouseReleased(MouseEvent arg0) { 
     // TODO Auto-generated method stub 
     System.out.println("released"); 
    } 

    @Override 
    public void mouseDragged(MouseEvent arg0) { 
     // TODO Auto-generated method stub 
    } 

    @Override 
    public void mouseMoved(MouseEvent me) { 
     // TODO Auto-generated method stub 
     if(me.getX()>=35 && me.getX()<=70 && me.getY()>=35 && me.getY()<=70){ 
      //JOptionPane.showMessageDialog(null,"Que voulez vous faire"); 
      this.setToolTipText("text"); 
      System.out.println(me.getX()+" "+me.getY()); 
     } 
     else if(me.getX()>=400 && me.getX()<=470 && me.getY()>=100 && me.getY(<=170){ 
      this.setToolTipText("Text 2"); 
      System.out.println(me.getX()+" "+me.getY()); 
     } 
    } 
} 

Answer 1

考慮使用本地Swing組件爲你的目標。它們提供你想要的所有功能：

• 處理鼠標點擊
• 顯示工具提示
• 顯示圖像

這裏是一個小片段向您展示如何使用JButton：

import java.awt.GridLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.net.MalformedURLException; 
import java.net.URL; 

import javax.swing.ImageIcon; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JOptionPane; 
import javax.swing.JPanel; 
import javax.swing.SwingUtilities; 

public class TestButtons { 

    protected void initUI() throws MalformedURLException { 
     JFrame frame = new JFrame(); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     JPanel panel = new JPanel(new GridLayout(2, 2, 20, 20)); 
     panel.add(createButton("https://pbs.twimg.com/profile_images/378800000534649369/489a1e058bea59b62fd73c56f4bcb6c7.jpeg")); 
     panel.add(createButton("https://pbs.twimg.com/profile_images/378800000714838591/ebbde1563faae6da2be79df945a7a02b.jpeg")); 
     panel.add(createButton("https://pbs.twimg.com/profile_images/3477392906/f1907df0bd76668deac4a5e31a22fbe7.jpeg")); 
     panel.add(createButton("https://pbs.twimg.com/profile_images/2718799802/9567ed3c3299f6f6ab1ffcbcbfd93da5.jpeg")); 
     frame.add(panel); 
     frame.pack(); 
     frame.setVisible(true); 
    } 

    private JButton createButton(final String url) throws MalformedURLException { 
     final JButton button = new JButton(new ImageIcon(new URL(url))); 
     button.setToolTipText("You are looking at image located at " + url); 
     button.setBorderPainted(false); 
     button.setContentAreaFilled(false); 
     button.addActionListener(new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent e) { 
       JOptionPane.showMessageDialog(button, 
         "You clicked on image located at " + url); 
      } 
     }); 
     return button; 
    } 

    /** 
    * @param args 
    */ 
    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       try { 
        new TestButtons().initUI(); 
       } catch (MalformedURLException e) { 
        e.printStackTrace(); 
       } 
      } 
     }); 
    } 

}