ant/org.eclipse.ant.ui/Ant Editor/org/eclipse/ant/internal/ui/editor/actions/FoldingToggleRulerAction.java

/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ant.internal.ui.editor.actions;

import org.eclipse.ant.internal.ui.editor.AntEditor;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.text.source.ISourceViewer;
import org.eclipse.jface.text.source.IVerticalRulerInfo;
import org.eclipse.jface.text.source.projection.ProjectionViewer;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.editors.text.IFoldingCommandIds;
import org.eclipse.ui.texteditor.AbstractRulerActionDelegate;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.ui.texteditor.TextOperationAction;

public class FoldingToggleRulerAction extends AbstractRulerActionDelegate {

	private IAction fUIAction;
	private TextOperationAction fAction;
	private ITextEditor fTextEditor;

	/* (non-Javadoc)
	 * @see org.eclipse.ui.texteditor.AbstractRulerActionDelegate#createAction(org.eclipse.ui.texteditor.ITextEditor, org.eclipse.jface.text.source.IVerticalRulerInfo)
	 */
	protected IAction createAction(ITextEditor editor, IVerticalRulerInfo rulerInfo) {
		fTextEditor= editor;
		fAction= new TextOperationAction(AntEditorActionMessages.getResourceBundle(), "Projection.Toggle.", editor, ProjectionViewer.TOGGLE, true); //$NON-NLS-1$
		fAction.setActionDefinitionId(IFoldingCommandIds.FOLDING_TOGGLE);
		return fAction;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.ui.IEditorActionDelegate#setActiveEditor(org.eclipse.jface.action.IAction, org.eclipse.ui.IEditorPart)
	 */
	public void setActiveEditor(IAction callerAction, IEditorPart targetEditor) {
		fUIAction= callerAction;
		super.setActiveEditor(callerAction, targetEditor);
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IMenuListener#menuAboutToShow(org.eclipse.jface.action.IMenuManager)
	 */
	public void menuAboutToShow(IMenuManager manager) {
		update();
		super.menuAboutToShow(manager);
	}
	
	private void update() {
		if (fTextEditor instanceof AntEditor) {
			ISourceViewer viewer= ((AntEditor) fTextEditor).getViewer();
			if (viewer instanceof ProjectionViewer) {
				boolean enabled= ((ProjectionViewer) viewer).getProjectionAnnotationModel() != null;
				fUIAction.setChecked(enabled);
			}
		}
	}
}