import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
/**
* This class turns 'e' characters red using a LineStyleListener
*/
public class RedEListener {
// Color for the StyleRanges
private Color red;
/**
* Runs the application
*/
public void run() {
Display display = new Display();
Shell shell = new Shell(display);
// Get color for style ranges
red = display.getSystemColor(SWT.COLOR_RED);
createContents(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
/**
* Creates the main window contents
*
* @param shell the main window
*/
private void createContents(Shell shell) {
shell.setLayout(new FillLayout());
// Create the StyledText
final StyledText styledText = new StyledText(shell, SWT.BORDER | SWT.H_SCROLL
| SWT.V_SCROLL);
// Add the syntax coloring handler
styledText.addLineStyleListener(new LineStyleListener() {
public void lineGetStyle(LineStyleEvent event) {
// Create a collection to hold the StyleRanges
java.util.List styles = new java.util.ArrayList();
// Iterate through the text
for (int i = 0, n = event.lineText.length(); i < n; i++) {
// Check for 'e'
if (event.lineText.charAt(i) == 'e') {
// Found an 'e'; combine all subsequent e's into the same StyleRange
int start = i;
for (; i < n && event.lineText.charAt(i) == 'e'; i++);
// Create the StyleRange and add it to the collection
styles.add(new StyleRange(event.lineOffset + start, i - start, red,
null));
}
}
// Set the styles for the line
event.styles = (StyleRange[]) styles.toArray(new StyleRange[0]);
}
});
}
/**
* The application entry point
*
* @param args the command line arguments
*/
public static void main(String[] args) {
new RedEListener().run();
}
}