eclipse rcp : help to create a customized StyledText widget - swt

Question

I want a customized StyledText widget which can accept a keyword list,then highlight these keywords!
I found it's very hard to implement it by myself.

Answer 1

God damned! after spent hours searching the web, I finally found some sample code from the book The Definitive Guide to SWT and JFace, it's quite simple :
Main class :
package amarsoft.rcp.base.widgets.test;
import org.eclipse.jface.window.ApplicationWindow;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import amarsoft.rcp.base.widgets.SQLSegmentEditor;
public class PageDemo extends ApplicationWindow {
public PageDemo(Shell parentShell) {
super(parentShell);
final Composite topComp = new Composite(parentShell, SWT.BORDER);
FillLayout fl = new FillLayout();
fl.marginWidth = 100;
topComp.setLayout(fl);
new SQLSegmentEditor(topComp);
}
/**
* #param args
*/
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
new PageDemo(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
package amarsoft.rcp.base.widgets;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
/**
* SQL语句/SQL语句片段编辑器，除了内容编辑之外，提供一个额外的功能——常用SQL语句关键字高亮显示。
* #author ggfan#amarsoft
*
*/
public class SQLSegmentEditor extends Composite{
private StyledText st;
public SQLSegmentEditor(Composite parent) {
super(parent, SWT.NONE);
this.setLayout(new FillLayout());
st = new StyledText(this, SWT.WRAP);
st.addLineStyleListener(new SQLSegmentLineStyleListener());
}
}
package amarsoft.rcp.base.widgets;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.LineStyleEvent;
import org.eclipse.swt.custom.LineStyleListener;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.graphics.Color;
import org.eclipse.wb.swt.SWTResourceManager;
public class SQLSegmentLineStyleListener implements LineStyleListener {
private static final Color KEYWORD_COLOR = SWTResourceManager
.getColor(SWT.COLOR_BLUE);
private List<String> keywords = new ArrayList<String>();
public SQLSegmentLineStyleListener() {
super();
keywords.add("select");
keywords.add("from");
keywords.add("where");
}
#Override
public void lineGetStyle(LineStyleEvent event) {
List<StyleRange> styles = new ArrayList<StyleRange>();
int start = 0;
int length = event.lineText.length();
System.out.println("current line length:" + event.lineText.length());
while (start < length) {
System.out.println("while lopp");
if (Character.isLetter(event.lineText.charAt(start))) {
StringBuffer buf = new StringBuffer();
int i = start;
for (; i < length
&& Character.isLetter(event.lineText.charAt(i)); i++) {
buf.append(event.lineText.charAt(i));
}
if (keywords.contains(buf.toString())) {
styles.add(new StyleRange(event.lineOffset + start, i - start, KEYWORD_COLOR, null, SWT.BOLD));
}
start = i;
}
else{
start ++;
}
}
event.styles = (StyleRange[]) styles.toArray(new StyleRange[0]);
}
}