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Thread: Action Listener

  1. #1
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    Default Action Listener

    Hi Everyone,
    I am writing this program to display this GUI with buttons ,I am trying to add an action listener to add functionality to the buttons.

    Problem:I am trying to display the colour of the buttons as in (i.e. When a blue button is clicked a blue rectangle is displayed in the center pane)

    Now I have managed to draw the rectangle on the center pane but when I add the action Listener to the button it does not compile it generates two errors.

    Can someone have a look at my code please , i dont know how to call the paint function into the Listener

    errors:

    shape.java:43:cannot find symbol
    symbol: method setColor(java.awt.Color)
    location: class MyPanel
    disp.setColor(Color.red)

    shape.java:43:cannot find symbol
    symbol: method fillRectr(int,int,int,int)
    location: class MyPanel
    disp.fillRectr(100,50,100,50)

    code:

    shape.java
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
     
     
     
    class shape extends JFrame{
     
          JButton b1 = new JButton("Red");
          JButton b2 = new JButton("Green");
          JButton b3 = new JButton("Blue");
          JButton b4 = new JButton("Black");
          JButton b5 = new JButton("Erase"); 
     
      JPanel east = new JPanel();
      MyPanel disp = new MyPanel();
      JPanel center = new JPanel();
     
     
      shape(){
     
         setupGUI();
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       }
     
       private void setupGUI(){
     
       Container cp = getContentPane();
       cp.setLayout(new BorderLayout());
       cp.add(BorderLayout.CENTER,disp);
       cp.add(disp);
       cp.add(BorderLayout.EAST,east);
       east.setLayout(new GridLayout(5,1));
       east.add(b1);
       east.add(b2);
       east.add(b3);
       east.add(b4);
       east.add(b5);
       b1.addActionListener(new ActionListener(){
           public void actionPerformed(ActionEvent e){
             if(e.getActionCommand().equals("RED")){
     
                 disp.setColor(Color.red);
                 disp.fillRect(100,50,100,50);
     
     
              //setColor(Color.red);
              //fillRect(100,50,100,50);
     
     
             }
           }
     
        });
       setSize(350,450);
       setVisible(true);
     
      }
      public static void main(String args[]){
     
         shape Pane = new shape();
     
     
     
       }
    }

    MyPanel.java

    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
     
     
    class MyPanel extends JPanel{
     
       public void paintComponent(Graphics g){
     
         super.paintComponent(g);
         g.setColor(Color.white);
         g.drawRect(100,50,100,50);
         g.fillRect(100,50,100,50);
     
       }
     
     
    }


  2. #2
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    Default Re: Action Listener

    Hello kray66,

    Welcome to the Java Programming Forums.

    Hows sunny Surrey? I'm in Essex myself..

    I think this link may help solve your problem:

    http://www.javaprogrammingforums.com...ava-swing.html
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  3. #3
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    Default Re: Action Listener

    HI kray66 i just take a look u'r code and how its means that ju called directly the method setColor or setSize from the object MyPanel ,u must inicialize a graphics pen graphics2d a=..... a.setColor...I'would look and one more time to unsure that that was a problem.All wishes

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