Solutions to selected exercises - An Introduction to Graphical User Interfaces with Java Swing - page 282

16.

this .getContentPane().setLayout( new GridLayout(4,1));

17.

redPanel = new JPanel();

18.

orangePanel = new JPanel();

19.

greenPanel = new JPanel();

20.

JButton nextButton = new JButton("Next");

21.

LightListener lightList = new LightListener( this );

22.

nextButton.addActionListener(lightList);

23.
24.
25.

this .getContentPane().add(redPanel);

26.

this .getContentPane().add(orangePanel);

27.

this .getContentPane().add(greenPanel);

28.

this .getContentPane().add(nextButton);

29.

System.out.println("c="+light.getCurrentColors());

30. setColor(light.getCurrentColors());

31. this .repaint();

32. }

33.
34.
35. private void setColor( int color){

36. switch (color) {

37. case Constants.LIGHT_RED:

38.

redPanel.setBackground(Color.red);

39.

orangePanel.setBackground(Color.lightGray);

40.

greenPanel.setBackground(Color.lightGray);

41.

break ;

42.

case Constants.LIGHT_RED_ORANGE:

43.

redPanel.setBackground(Color.red);

44.

orangePanel.setBackground(Color.orange);

45.

greenPanel.setBackground(Color.lightGray);

46.

break ;

47.

case Constants.LIGHT_GREEN:

48.

redPanel.setBackground(Color.lightGray);

49.

orangePanel.setBackground(Color.lightGray);

50.

greenPanel.setBackground(Color.green);

51.

break ;

52. case Constants.LIGHT_ORANGE:

53. redPanel.setBackground(Color.lightGray);

54. orangePanel.setBackground(Color.orange);

55. greenPanel.setBackground(Color.lightGray);

56. break ;

57. default :

58. System.out.println("ERROR: ILLEGAL COLOR COMBINATION!");

59. break ;

60.

}// Switch

61.

}