org.eclipse.ui.examples.javaeditor/Eclipse Java Editor Example/org/eclipse/ui/examples/javaeditor/PresentationAction.java

package org.eclipse.ui.examples.javaeditor;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */

import java.util.ResourceBundle;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.ui.texteditor.TextEditorAction;

/**
 * A toolbar action which toggles the presentation model of the
 * connected text editor. The editor shows either the highlight range
 * only or always the whole document.
 */
public class PresentationAction extends TextEditorAction {

	/**
	 * Constructs and updates the action.
	 */
	public PresentationAction() {
		super(JavaEditorMessages.getResourceBundle(), "TogglePresentation.", null); //$NON-NLS-1$
		update();
	}
	
	/* (non-Javadoc)
	 * Method declared on IAction
	 */
	public void run() {

		ITextEditor editor= getTextEditor();

		editor.resetHighlightRange();
		boolean show= editor.showsHighlightRangeOnly();
		setChecked(!show);
		editor.showHighlightRangeOnly(!show);
	}
	
	/* (non-Javadoc)
	 * Method declared on TextEditorAction
	 */
	public void update() {
		setChecked(getTextEditor() != null && getTextEditor().showsHighlightRangeOnly());
		setEnabled(true);
	}
}