import org.eclipse.jface.text.TextViewerUndoManager; //导入依赖的package包/类
/**
 * �����༭��
 * 
 * @return
 */
public void createTextArea(TextViewerUndoManager undo) {
	if (wv == null || wv.isDisposed()) {

		tv = new TextViewer(this, SWT.WRAP | SWT.V_SCROLL);
		StyledText styledText = tv.getTextWidget();
		if (undo != null) {
			undo.disconnect();
			undo.connect(tv);
		} else
			tvum = new TextViewerUndoManager(100);
		tv.setUndoManager(tvum);
		tv.activatePlugins();
		setCurrentTextArea(styledText);
		blackTextArea = new blackTextArea(styledText, this);
	} else {
		// wv.disposeTextArea();
		wv.createTextArea(null);
	}
}
 

import org.eclipse.jface.text.TextViewerUndoManager; //导入依赖的package包/类
public void createTextArea(IDocument iDocument){

	if(b.text != null && !b.text.isDisposed()){
		disposeTextArea();
	}
	b.tv = new TextViewer(b, SWT.V_SCROLL|SWT.WRAP);
	b.text = b.tv.getTextWidget();
	b.text.setVisible(false);
	b.text.setParent(this);
	setStyledTextLayout(x);
	b.blackTextArea = new blackTextArea(b.text,b);
	b.blackTextArea.writingView();
	b.tv.setUndoManager(new TextViewerUndoManager(100));
	b.tv.activatePlugins();
	if(b.ba.isFullScreenWritingView())
		b.ba.changeColor(b.ba.lastForeColor, b.ba.lastBackColor);
	if(iDocument != null) {
		b.tv.setDocument(iDocument);
	}
	addSlider();
	layout();
	b.text.setFocus();
	b.text.setVisible(true);
}
 

import org.eclipse.jface.text.TextViewerUndoManager; //导入依赖的package包/类
/**
 * Creates the undo manager (uses the undo level of general text editors)
 */
/* Override */
public IUndoManager getUndoManager( ISourceViewer sourceViewer )
{      
   TextViewerUndoManager undoManager = new TextViewerUndoManager( 
      PreferenceManager.getExternalPreferenceInt( 
         ExternalPreference.EDITOR_UNDO_LEVEL
      )
   );
   
   editor.setUndoManager( undoManager );
   return undoManager;
}
 

import org.eclipse.jface.text.TextViewerUndoManager; //导入依赖的package包/类
/**
 * 给TextViewer设置UndoManager
 * @param textViewer
 *            ;
 */
public void initUndoManager(int undoLevel) {
	// remembers edit commands
	final TextViewerUndoManager undoManager = new TextViewerUndoManager(undoLevel);
	// add listeners
	undoManager.connect(this);
	this.setUndoManager(undoManager);
}
 

import org.eclipse.jface.text.TextViewerUndoManager; //导入依赖的package包/类
private void initUndoManager(int undoLevel) {
	// remembers edit commands
	final TextViewerUndoManager undoManager = new TextViewerUndoManager(undoLevel);
	// add listeners
	undoManager.connect(this);
	this.setUndoManager(undoManager);
}
 

import org.eclipse.jface.text.TextViewerUndoManager; //导入依赖的package包/类
@Override
public IUndoManager getUndoManager(ISourceViewer sourceViewer) {
	return new TextViewerUndoManager(unDoLimit);
}
 

import org.eclipse.jface.text.TextViewerUndoManager; //导入依赖的package包/类
/**
 * Set the undo manager for this editor.
 * @param undoManager The new undo manager.
 */
public void setUndoManager( TextViewerUndoManager undoManager )
{
   this.undoManager = undoManager;
}
 

import org.eclipse.jface.text.TextViewerUndoManager; //导入依赖的package包/类
/**
 * Get this editors undo manager.
 * @return The undo manager this editor uses.
 */
public TextViewerUndoManager getUndoManager()
{
   return undoManager;
}