| Код | public class JTextReader extends JComponent
{
private String fileName;
private String encoding;
private BufferedImage img;
private Font smallFont;
private Font bigFont;
private int currentY;
public JTextReader(String fileName, String encoding)
{
this.fileName = fileName;
this.encoding = encoding;
img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);
bigFont = new Font("Serif", Font.BOLD, 14);
smallFont = new Font("Serif", Font.PLAIN, 10);
currentY = 20;
setOpaque(true);
}
private void updateBuffer()
{
if(getWidth() != img.getWidth() || getHeight() != img.getHeight())
img = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D) img.getGraphics();
g2.clearRect(0, 0, img.getWidth(), img.getHeight());
File file = new File(fileName);
if(file.exists())
{
FontMetrics arialBigMetrics = g2.getFontMetrics(bigFont);
FontMetrics arialSmallMetrics = g2.getFontMetrics(smallFont);
Rectangle2D rect = arialBigMetrics.getStringBounds(fileName, g2);
int dy = (int) rect.getHeight();
int y = currentY;
try
{
BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), encoding));
String line;
boolean useBigFont = true;
while((line = reader.readLine()) != null)
{
if(useBigFont)
g2.setFont(bigFont);
else
g2.setFont(smallFont);
g2.drawString(line, (float)10, (float)y);
y += dy;
useBigFont = !useBigFont;
if(y > img.getHeight())
break;
}
reader.close();
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
}
public void scroll(int amount)
{
currentY += amount;
updateBuffer();
repaint();
}
protected void paintComponent(Graphics g)
{
if(getWidth() != img.getWidth() || getHeight() != img.getHeight())
updateBuffer();
g.setColor(getBackground());
g.clearRect(0, 0, getWidth(), getHeight());
g.drawImage(img, 0, 0, this);
}
public static void main(String[] args)
{
final JTextReader textReader = new JTextReader("C:\\TMP\\RDBMS\\admin.txt", "Cp866");
JButton upButton = new JButton("UP");
upButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
textReader.scroll(30);
}
});
JButton downButton = new JButton("DOWN");
downButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
textReader.scroll(-30);
}
});
JFrame frame = new JFrame("Text frame");
frame.getContentPane().add(textReader, BorderLayout.CENTER);
frame.getContentPane().add(upButton, BorderLayout.NORTH);
frame.getContentPane().add(downButton, BorderLayout.SOUTH);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setSize(800, 600);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
} |
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!!!!!!