Hi,friends...
i am programming for builiding an IDE...I have written two differnt codes...one for creating the text area...and another for the scroll bars...but if i want to get the scroll bars and the text area in the same program..what should i do....i tried integrating the two codes but i get two different screens as output...(one displaying scrollbar other the text area..)
i ll attach the codes here..for ur reference...
CODE
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
public class BasicTextEditor1 extends JFrame
{
public static final String FONTS[] = { "Serif", "SansSerif",
"Courier" };
protected Font m_fonts[];
protected JTextArea m_monitor;
protected JMenuItem[] m_fontMenus;
protected JCheckBoxMenuItem m_bold;
protected JCheckBoxMenuItem m_italic;
protected JFileChooser m_chooser;
public BasicTextEditor1()
{
super("Basic text editor: part I - Menus");
setSize(450, 350);
m_fonts = new Font[FONTS.length];
for (int k = 0; k < FONTS.length; k++)
m_fonts[k] = new Font(FONTS[k], Font.PLAIN, 12);
m_monitor = new JTextArea();
JScrollPane ps = new JScrollPane(m_monitor);
getContentPane().add(ps, BorderLayout.CENTER);
m_monitor.append("Basic text editor");
JMenuBar menuBar = createMenuBar();
setJMenuBar(menuBar);
m_chooser = new JFileChooser();
m_chooser.setCurrentDirectory(new File("."));
WindowListener wndCloser = new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
};
addWindowListener(wndCloser);
updateMonitor();
setVisible(true);
}
protected JMenuBar createMenuBar()
{
final JMenuBar menuBar = new JMenuBar();
JMenu mFile = new JMenu("File");
mFile.setMnemonic('f');
JMenuItem item = new JMenuItem("New");
item.setIcon(new ImageIcon("file_new.gif"));
item.setMnemonic('n');
ActionListener lst = new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
m_monitor.setText("");
}
};
item.addActionListener(lst);
mFile.add(item);
item = new JMenuItem("Open...");
item.setIcon(new ImageIcon("file_open.gif"));
item.setMnemonic('o');
lst = new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
BasicTextEditor1.this.repaint();
if (m_chooser.showOpenDialog(BasicTextEditor1.this) !=
JFileChooser.APPROVE_OPTION)
return;
Thread runner = new Thread() {
public void run() {
File fChoosen = m_chooser.getSelectedFile();
try
{
FileReader in = new FileReader(fChoosen);
m_monitor.read(in, null);
in.close();
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
};
runner.start();
}
};
item.addActionListener(lst);
mFile.add(item);
item = new JMenuItem("Save...");
item.setIcon(new ImageIcon("file_save.gif"));
item.setMnemonic('s');
lst = new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
BasicTextEditor1.this.repaint();
if (m_chooser.showSaveDialog(BasicTextEditor1.this) !=
JFileChooser.APPROVE_OPTION)
return;
Thread runner = new Thread() {
public void run() {
File fChoosen = m_chooser.getSelectedFile();
try
{
FileWriter out = new FileWriter(fChoosen);
m_monitor.write(out);
out.close();
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
};
runner.start();
}
};
item.addActionListener(lst);
mFile.add(item);
mFile.addSeparator();
item = new JMenuItem("Exit");
item.setMnemonic('x');
lst = new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.exit(0);
}
};
item.addActionListener(lst);
mFile.add(item);
menuBar.add(mFile);
ActionListener fontListener = new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
updateMonitor();
}
};
JMenu mFont = new JMenu("Font");
mFont.setMnemonic('o');
ButtonGroup group = new ButtonGroup();
m_fontMenus = new JMenuItem[FONTS.length];
for (int k = 0; k < FONTS.length; k++)
{
int m = k+1;
m_fontMenus[k] = new JRadioButtonMenuItem(
m+" "+FONTS[k]);
boolean selected = (k == 0);
m_fontMenus[k].setSelected(selected);
m_fontMenus[k].setMnemonic('1'+k);
m_fontMenus[k].setFont(m_fonts[k]);
m_fontMenus[k].addActionListener(fontListener);
group.add(m_fontMenus[k]);
mFont.add(m_fontMenus[k]);
}
mFont.addSeparator();
m_bold = new JCheckBoxMenuItem("Bold");
m_bold.setMnemonic('b');
Font fn = m_fonts[1].deriveFont(Font.BOLD);
m_bold.setFont(fn);
m_bold.setSelected(false);
m_bold.addActionListener(fontListener);
mFont.add(m_bold);
m_italic = new JCheckBoxMenuItem("Italic");
m_italic.setMnemonic('i');
fn = m_fonts[1].deriveFont(Font.ITALIC);
m_italic.setFont(fn);
m_italic.setSelected(false);
m_italic.addActionListener(fontListener);
mFont.add(m_italic);
menuBar.add(mFont);
return menuBar;
}
protected void updateMonitor()
{
int index = -1;
for (int k = 0; k < m_fontMenus.length; k++)
{
if (m_fontMenus[k].isSelected())
{
index = k;
break;
}
}
if (index == -1)
return;
if (index==2) // Courier
{
m_bold.setSelected(false);
m_bold.setEnabled(false);
m_italic.setSelected(false);
m_italic.setEnabled(false);
}
else
{
m_bold.setEnabled(true);
m_italic.setEnabled(true);
}
int style = Font.PLAIN;
if (m_bold.isSelected())
style |= Font.BOLD;
if (m_italic.isSelected())
style |= Font.ITALIC;
Font fn = m_fonts[index].deriveFont(style);
m_monitor.setFont(fn);
m_monitor.repaint();
}
public static void main(String argv[])
{
new BasicTextEditor();
new ScrollDemo();
}
}
class ScrollDemo extends JFrame
{
public ScrollDemo() {
super("JScrollBar Demo");
setSize(300,250);
ImageIcon ii = new ImageIcon("earth.jpg");
CustomScrollPane sp = new CustomScrollPane(new JLabel(ii));
getContentPane().add(sp);
WindowListener wndCloser = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
};
addWindowListener(wndCloser);
setVisible(true);
}
}
class CustomScrollPane extends JPanel
{
protected JScrollBar m_vertSB;
protected JScrollBar m_horzSB;
protected CustomViewport m_viewport;
protected JComponent m_comp;
public CustomScrollPane(JComponent comp) {
setLayout(null);
m_viewport = new CustomViewport();
m_viewport.setLayout(null);
add(m_viewport);
m_comp = comp;
m_viewport.add(m_comp);
m_vertSB = new JScrollBar(
JScrollBar.VERTICAL, 0, 0, 0, 0);
m_vertSB.setUnitIncrement(5);
add(m_vertSB);
m_horzSB = new JScrollBar(
JScrollBar.HORIZONTAL, 0, 0, 0, 0);
m_horzSB.setUnitIncrement(5);
add(m_horzSB);
AdjustmentListener lst = new AdjustmentListener() {
public void adjustmentValueChanged(AdjustmentEvent e) {
m_viewport.doLayout();
}
};
m_vertSB.addAdjustmentListener(lst);
m_horzSB.addAdjustmentListener(lst);
}
public void doLayout() {
Dimension d = getSize();
Dimension d0 = m_comp.getPreferredSize();
Dimension d1 = m_vertSB.getPreferredSize();
Dimension d2 = m_horzSB.getPreferredSize();
int w = Math.max(d.width - d1.width-1, 0);
int h = Math.max(d.height - d2.height-1, 0);
m_viewport.setBounds(0, 0, w, h);
m_vertSB.setBounds(w+1, 0, d1.width, h);
m_horzSB.setBounds(0, h+1, w, d2.height);
int xs = Math.max(d0.width - w, 0);
m_horzSB.setMaximum(xs);
m_horzSB.setBlockIncrement(xs/5);
m_horzSB.setEnabled(xs > 0);
int ys = Math.max(d0.height - h, 0);
m_vertSB.setMaximum(ys);
m_vertSB.setBlockIncrement(ys/5);
m_vertSB.setEnabled(ys > 0);
m_horzSB.setVisibleAmount(m_horzSB.getBlockIncrement());
m_vertSB.setVisibleAmount(m_vertSB.getBlockIncrement());
}
public Dimension getPreferredSize() {
Dimension d0 = m_comp.getPreferredSize();
Dimension d1 = m_vertSB.getPreferredSize();
Dimension d2 = m_horzSB.getPreferredSize();
Dimension d = new Dimension(d0.width+d1.width,
d0.height+d2.height);
return d;
}
class CustomViewport extends JPanel
{
public void doLayout() {
Dimension d0 = m_comp.getPreferredSize();
int x = m_horzSB.getValue();
int y = m_vertSB.getValue();
m_comp.setBounds(-x, -y, d0.width, d0.height);
}
}
}
This post has been edited by William_Wilson: 18 Sep, 2007 - 08:23 PM
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