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JtextField クラスを拡張し、paintComponent(Graphics g) メソッドをオーバーライドして、カスタム JTextField を作成しました。コンパイルして JFrame にドラッグすると、正常に動作します。しかし、実行すると結果が異なります。

私のカスタム JTextField は、super.paintComponent(g); の結果であると思われる白い四角で覆われています。方法。

これは私の paintComponent() メソッドのコードです。

@Override
protected void paintComponent(Graphics g) {
    Graphics2D gd = (Graphics2D) g.create();
    gd.setPaint(new GradientPaint(0, 0, Color.BLUE, getWidth(), 0, Color.BLACK));
    gd.fillRoundRect(0, 0, getWidth(), getHeight(), getWidth() / 2, getHeight() / 2);
    gd.dispose();
    super.paintComponent(g);
}
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3 に答える 3

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super.paintComponent(g)の上部に移動しますpaintComponent。このようにして、スーパークラスpaintComponentが実行された後にカスタムペイントが行われるようにします。

于 2012-10-28T15:59:16.020 に答える
0 
//Here is a example for Custom JTextfeild

1. This supports highlighting Jtextfeild with Icons.

2. This custom Jtextfeild with different fonts.

  Header Section
---------------------
import java.awt.*;  
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;  
import javax.swing.*;  
import javax.swing.border.Border;



//Main class section 

    public class CustomJTextFeild extends JTextField implements FocusListener,KeyListener{
          private Color color;
          private ImageIcon normal_icon;
          private ImageIcon hover_icon;
          private ImageIcon icon_Label;
          private boolean start_action=false;
          private String Matchtext;
          private int x0 ;

 //Constructor with input parameters
 //icon ->  normal icon
 //icon 1-> hover icon
 //text ->  initial text 

     public  CustomJTextFeild(ImageIcon icon,ImageIcon icon1, String text) { 


        this.normal_icon=icon;
            this.hover_icon=icon1;
            this.icon_Label=normal_icon;
            this.Matchtext=text;

            Font myFont = new Font("Segoe UI", Font.BOLD,12);
            setFont(myFont);
            Border border = UIManager.getBorder("TextField.border");  
            x0 = border.getBorderInsets(new JTextField()).left;  
            Border Textborder = BorderFactory.createLineBorder(new Color(0xd4d4d4 , false), 2 );
            setBorder(BorderFactory.createCompoundBorder(Textborder, 
            BorderFactory.createEmptyBorder(0,5 + icon_Label.getIconWidth(), 0, 0)));
            setText(text);
            addFocusListener(this) ; 
            addKeyListener(this) ; 

        }

    @Override
    public void paintComponent(Graphics g) {

       int y = (this.getHeight() - icon_Label.getIconHeight())/2;  
       super.paintComponent(g);  
       g.drawImage(icon_Label.getImage(), x0, y, this);   

    }

    @Override
    public void focusGained(FocusEvent e) {
        // TODO Auto-generated method stub
        if(e.getSource() == this && !this.start_action)
            this.setText("");

         this.icon_Label=hover_icon;
         this.repaint();
         this.revalidate();


    }
    @Override
    public void focusLost(FocusEvent arg0) {
        // TODO Auto-generated method stub
        if(!this.start_action || this.getText().length()==0)
           this.setText(this.Matchtext);

         this.icon_Label=normal_icon;
         this.repaint();
         this.revalidate();
    }
    @Override
    public void keyPressed(KeyEvent arg0) {
        // TODO Auto-generated method stub

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

    }
    @Override
    public void keyTyped(KeyEvent arg0) {
        // TODO Auto-generated method stub
        this.start_action=true;
    }



    }  

/* Output */

 JtextFeild name_Value=new CustomJTextFeild(   new ImageIcon(getClass().getResource("filename1")).getImage(), new ImageIcon(getClass().getResource("filename")).getImage(),"Name");
于 2014-01-20T11:29:45.143 に答える