/*******************************************************************************
 * Copyright (c) 2009, 2010 Progress Software Corporation.
 * 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
 ******************************************************************************/
// Copyright (c) 2009 Progress Software Corporation.  
package org.fusesource.tools.core.ui.viewer.actions;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.jface.action.IMenuListener;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.action.Separator;
import org.eclipse.jface.text.source.SourceViewer;

public class SourceViewerContextMenuProvider {
    private SourceViewer sourceViewer;
    private List<SourceViewerAction> actionList;
    private CopyAction copyAction;
    private PasteAction pasteAction;
    private DeleteAction deleteAction;
    private CutAction cutAction;
    private SourceViewerAction selectAllAction;

    public SourceViewerContextMenuProvider(SourceViewer sourceViewer) {
        this.sourceViewer = sourceViewer;
        if (sourceViewer != null) {
            createSourceActions();
            fillContextMenu();
        }
    }

    /**
     * Creating Source Viewer Actions
     */
    private void createSourceActions() {
        actionList = new ArrayList<SourceViewerAction>();
        copyAction = new CopyAction(sourceViewer);
        actionList.add(copyAction);
        pasteAction = new PasteAction(sourceViewer);
        actionList.add(pasteAction);
        deleteAction = new DeleteAction(sourceViewer);
        actionList.add(deleteAction);
        cutAction = new CutAction(sourceViewer);
        actionList.add(cutAction);
        selectAllAction = new SelectAllAction(sourceViewer);
        actionList.add(selectAllAction);

    }

    /**
     * Adding Context Menu for Query Source Viewer.
     */
    private void fillContextMenu() {
        MenuManager menuManager = null;
        if (menuManager == null) {
            menuManager = new MenuManager("QuerySourcePopupMenu"); //$NON-NLS-1$
            menuManager.setRemoveAllWhenShown(true);
            menuManager.addMenuListener(new IMenuListener() {
                public void menuAboutToShow(IMenuManager manager) {

                    updateActions();
                    manager.add(cutAction);
                    manager.add(copyAction);
                    manager.add(pasteAction);
                    manager.add(deleteAction);
                    manager.add(new Separator());
                    manager.add(selectAllAction);
                }

            });
        }
        sourceViewer.getTextWidget().setMenu(menuManager.createContextMenu(sourceViewer.getTextWidget()));
    }

    /**
     * updating the Actions while popup Context Menu
     */

    private void updateActions() {
        for (SourceViewerAction action : actionList) {
            action.updateAction();
        }
    }

}