import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.jface.databinding.swt.SWTObservables;
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.custom.StyledText;
import org.eclipse.swt.custom.VerifyKeyListener;
import org.eclipse.swt.events.TraverseEvent;
import org.eclipse.swt.events.TraverseListener;
import org.eclipse.swt.events.VerifyEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.wb.swt.SWTResourceManager;
/**
* 关键字高亮编辑器。This class is a simple customized widget that wrappes a {@link org.eclipse.swt.custom.StyledText StyledText}.
* It consumes a keyword array and highlight them.
* @author ggfan@amarsoft
*
*/
public class KeywordsHighlightingEditor extends Composite{
private Color color = SWTResourceManager.getColor(SWT.COLOR_BLUE);
private Color variableColor = SWTResourceManager.getColor(SWT.COLOR_DARK_GREEN);
private String[] keywords;
private StyledText st;
public void setKeywordsColor(Color color){
this.color = color;
}
public void setKeywordsBgColor(Color color){
}
public IObservableValue observerContent(){
return SWTObservables.observeText(st, SWT.Modify);
}
public KeywordsHighlightingEditor(Composite parent, String[] keywords) {
super(parent, SWT.NONE);
this.keywords = keywords;
this.setLayout(new FillLayout());
st = new StyledText(this, SWT.WRAP | SWT.BORDER | SWT.V_SCROLL);
// 禁止回车键换行
st.addVerifyKeyListener(new VerifyKeyListener(){
public void verifyKey(VerifyEvent event) {
if(event.keyCode == SWT.CR){
event.doit = false;
}
}
});
// Tab键失去焦点而不是插入制表符
st.addTraverseListener(new TraverseListener(){
public void keyTraversed(TraverseEvent e) {
if (e.detail == SWT.TRAVERSE_TAB_NEXT || e.detail == SWT.TRAVERSE_TAB_PREVIOUS) {
e.doit = true;
}
}
});
st.addLineStyleListener(new SQLSegmentLineStyleListener());
}
private class SQLSegmentLineStyleListener implements LineStyleListener {
@Override
public void lineGetStyle(LineStyleEvent event) {
if(keywords == null || keywords.length == 0){
return;
}
List<StyleRange> styles = new ArrayList<StyleRange>();
int start = 0;
int length = event.lineText.length();
while (start < length) {
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(Arrays.asList(keywords).contains(buf.toString())) {
styles.add(new StyleRange(event.lineOffset + start, i - start, color, null, SWT.BOLD));
}
start = i;
}else if (event.lineText.charAt(start) == '#') {
StringBuffer buf = new StringBuffer();
buf.append('#');
int i = start + 1;
for (; i < length && Character.isLetter(event.lineText.charAt(i)); i++) {
buf.append(event.lineText.charAt(i));
}
if(buf.toString().matches("#[a-zA-Z]+\\d?")) {
styles.add(new StyleRange(event.lineOffset + start, i - start, variableColor, null, SWT.NORMAL));
}
start = i;
}
else{
start ++;
}
}
event.styles = (StyleRange[]) styles.toArray(new StyleRange[0]);
}
}
}
posted on 2011-10-12 10:42
West Farmer 阅读(929)
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