/*******************************************************************************
 * Copyright (c) 2000, 2007 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
 *     Wind River - Pawel Piech - Drag/Drop to Expressions View (Bug 184057)
 *******************************************************************************/
package org.eclipse.debug.internal.ui.views.expression;

 
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.internal.ui.IDebugHelpContextIds;
import org.eclipse.debug.internal.ui.preferences.IDebugPreferenceConstants;
import org.eclipse.debug.internal.ui.viewers.model.provisional.TreeModelViewer;
import org.eclipse.debug.internal.ui.views.variables.AvailableLogicalStructuresAction;
import org.eclipse.debug.internal.ui.views.variables.SelectionDragAdapter;
import org.eclipse.debug.internal.ui.views.variables.VariablesView;
import org.eclipse.debug.internal.ui.views.variables.VariablesViewMessages;
import org.eclipse.debug.internal.ui.views.variables.details.AvailableDetailPanesAction;
import org.eclipse.debug.ui.IDebugUIConstants;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.IToolBarManager;
import org.eclipse.jface.action.Separator;
import org.eclipse.jface.util.LocalSelectionTransfer;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.ui.IWorkbenchActionConstants;
 
/**
 * Displays expressions and their values with a detail
 * pane.
 */
public class ExpressionView extends VariablesView {
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.views.variables.VariablesView#getHelpContextId()
	 */
	protected String getHelpContextId() {
		return IDebugHelpContextIds.EXPRESSION_VIEW;		
	}	
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.views.variables.VariablesView#configureToolBar(org.eclipse.jface.action.IToolBarManager)
	 */
	protected void configureToolBar(IToolBarManager tbm) {
		super.configureToolBar(tbm);
		tbm.add(new Separator(IDebugUIConstants.EMPTY_EXPRESSION_GROUP));		
		tbm.add(new Separator(IDebugUIConstants.EXPRESSION_GROUP));
	}	
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.views.variables.VariablesView#fillContextMenu(org.eclipse.jface.action.IMenuManager)
	 */
	protected void fillContextMenu(IMenuManager menu) {

		menu.add(new Separator(IDebugUIConstants.EMPTY_EXPRESSION_GROUP));
		menu.add(new Separator(IDebugUIConstants.EXPRESSION_GROUP));
		menu.add(getAction(VARIABLES_FIND_ELEMENT_ACTION));
		menu.add(getAction("ChangeVariableValue")); //$NON-NLS-1$
		menu.add(new Separator());
		IAction action = new AvailableLogicalStructuresAction(this);
        if (action.isEnabled()) {
            menu.add(action);
        }
		action = new AvailableDetailPanesAction(this);
		if (isDetailPaneVisible() && action.isEnabled()) {
			menu.add(action);
		}
		menu.add(new Separator(IDebugUIConstants.EMPTY_RENDER_GROUP));
		menu.add(new Separator(IWorkbenchActionConstants.MB_ADDITIONS));
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.views.variables.VariablesView#contextActivated(org.eclipse.jface.viewers.ISelection)
	 */
	protected void contextActivated(ISelection selection) {
		if (selection == null || selection.isEmpty()) {
			setViewerInput(DebugPlugin.getDefault().getExpressionManager());
		} else {
			super.contextActivated(selection);
		}
        if (isAvailable() && isVisible()) {
            updateAction("ContentAssist"); //$NON-NLS-1$
        }
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.views.variables.VariablesView#getDetailPanePreferenceKey()
	 */
	protected String getDetailPanePreferenceKey() {
		return IDebugPreferenceConstants.EXPRESSIONS_DETAIL_PANE_ORIENTATION;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.views.variables.VariablesView#getToggleActionLabel()
	 */
	protected String getToggleActionLabel() {
		return VariablesViewMessages.ExpressionView_4; 
	}
    
	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.views.variables.VariablesView#getViewerStyle()
	 */
	protected int getViewerStyle() {
		return SWT.MULTI | SWT.V_SCROLL | SWT.H_SCROLL | SWT.VIRTUAL;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.views.variables.VariablesView#getPresentationContextId()
	 */
	protected String getPresentationContextId() {
		return IDebugUIConstants.ID_EXPRESSION_VIEW;
	}	
	
    /* (non-Javadoc)
     * @see org.eclipse.debug.internal.ui.views.variables.VariablesView#initDragAndDrop(org.eclipse.debug.internal.ui.viewers.model.provisional.TreeModelViewer)
     */
    protected void initDragAndDrop(TreeModelViewer viewer) {
        viewer.addDragSupport(DND.DROP_MOVE, new Transfer[] {LocalSelectionTransfer.getTransfer()}, new SelectionDragAdapter(viewer));
        viewer.addDropSupport(DND.DROP_MOVE|DND.DROP_COPY, new Transfer[] {LocalSelectionTransfer.getTransfer(), TextTransfer.getInstance()}, new ExpressionDropAdapter(viewer));
    }    	
    
}