projection_attempt.diff

diff --git a/src/com/redcareditor/mate/MateText.java b/src/com/redcareditor/mate/MateText.java
index 209fec9..7159d85 100644
--- a/src/com/redcareditor/mate/MateText.java
+++ b/src/com/redcareditor/mate/MateText.java
@@ -11,6 +11,9 @@ import org.eclipse.jface.text.Document;
 import org.eclipse.jface.text.IDocument;
 import org.eclipse.jface.text.source.CompositeRuler;
 import org.eclipse.jface.text.source.SourceViewer;
+import org.eclipse.jface.text.source.OverviewRuler;
+import org.eclipse.jface.text.source.projection.ProjectionViewer;
+import org.eclipse.jface.text.projection.*;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.StyledText;
 import org.eclipse.swt.graphics.Color;
@@ -28,6 +31,7 @@ import com.redcareditor.mate.document.swt.SwtMateDocument;
 import com.redcareditor.mate.undo.MateTextUndoManager;
 import com.redcareditor.mate.undo.swt.SwtMateTextUndoManager;
 import com.redcareditor.mate.WhitespaceCharacterPainter;
+import com.redcareditor.mate.SharedTextColors;
 import com.redcareditor.mate.LineNumberRulerColumn;
 import com.redcareditor.onig.NullRx;
 import com.redcareditor.onig.Rx;
@@ -55,6 +59,8 @@ public class MateText {
 	private CompositeRuler gutter;
 	private LineNumberRulerColumn lineNumbers;
 	private SwtMateDocument mateDocument;
+    private OverviewRuler overviewRuler;
+    private SharedTextColors sharedColors;
 
 	private MateTextUndoManager undoManager;
 	private List<IGrammarListener> grammarListeners;
@@ -69,16 +75,23 @@ public class MateText {
 
 	public MateText(Composite parent, boolean thisSingleLine) {
 		singleLine = thisSingleLine;
-		document = new Document();
-		gutter = constructRuler();
+        document = new Document();
 		if (singleLine) {
 			viewer = new SourceViewer(parent, null, SWT.FULL_SELECTION | SWT.HORIZONTAL | SWT.VERTICAL | SWT.SINGLE);
+    		viewer.setDocument(document);
 		}
 		else {
-			viewer = new SourceViewer(parent, gutter, SWT.FULL_SELECTION | SWT.HORIZONTAL | SWT.VERTICAL);
-		}
-		viewer.setDocument(document);
-		
+            sharedColors = new SharedTextColors();
+            overviewRuler = new OverviewRuler(null, 20, sharedColors);
+    		gutter = constructRuler();
+			viewer = new ProjectionViewer(parent, gutter, overviewRuler, true, SWT.FULL_SELECTION | SWT.HORIZONTAL | SWT.VERTICAL);
+            viewer.doOperation(ProjectionViewer.TOGGLE);
+            
+            ProjectionDocumentManager manager = new ProjectionDocumentManager();
+            ProjectionDocument projectionDocument = (ProjectionDocument) manager.createSlaveDocument(document);		
+    		viewer.setDocument(projectionDocument);
+        }
+        
 		whitespaceCharacterPainter = new WhitespaceCharacterPainter(viewer);
 		showingInvisibles = false;