Java Reference
In-Depth Information
75
drawSpace.setLevel(level);
repaint();
76
77
}
78
}
79
}
// end anonymous inner class
80
);
// end addActionListener
81
82
// set up increase level button to add to control panel
83
// and register listener
84
final
JButton increaseLevelJButton =
new
JButton(
"Increase Level"
);
85
controlJPanel.add(increaseLevelJButton);
86
increaseLevelJButton.addActionListener(
87
new
ActionListener()
// anonymous inner class
88
{
89
// process increaseLevelJButton event
90
@Override
91
public
void
actionPerformed(ActionEvent event)
92
{
93
int
level = drawSpace.getLevel();
++level;
94
95
96
// modify level if possible
97
if
((level >=
MIN_LEVEL
)) &&
98
(level <=
MAX_LEVEL
))
99
{
100
101
102
103
}
104
}
105
}
// end anonymous inner class
106
);
// end addActionListener
107
108
controlJPanel.add(levelJLabel);
109
110
// create mainJPanel to contain controlJPanel and drawSpace
111
final
JPanel mainJPanel =
new
JPanel();
112
mainJPanel.add(controlJPanel);
113
mainJPanel.add(drawSpace);
114
115
add(mainJPanel);
// add JPanel to JFrame
116
117
setSize(
WIDTH
,
HEIGHT
);
// set size of JFrame
118
setVisible(
true
);
// display JFrame
119
}
// end Fractal constructor
120
121
public
static
void
main(String[] args)
122
{
123
Fractal demo =
new
Fractal();
124
demo.setDefaultCloseOperation(
JFrame.EXIT_ON_CLOSE
);
125
}
126
}
// end class Fractal
levelJLabel.setText(
"Level: "
+ level);
drawSpace.setLevel(level);
repaint();
Fig. 18.18
|
Fractal user interface. (Part 3 of 3.)
