org.eclipse.mylyn.internal.cdt.ui.CDTEditorMonitor.java Source code

Introduction

Here is the source code for org.eclipse.mylyn.internal.cdt.ui.CDTEditorMonitor.java

Source

/*******************************************************************************
 * Copyright (c) 2004, 2009 Mylyn project committers 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
 *******************************************************************************/

package org.eclipse.mylyn.internal.cdt.ui;

import java.util.Iterator;

import org.eclipse.cdt.core.model.CModelException;
import org.eclipse.cdt.core.model.IBinary;
import org.eclipse.cdt.core.model.ICElement;
import org.eclipse.cdt.internal.ui.actions.SelectionConverter;
import org.eclipse.cdt.internal.ui.editor.CEditor;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.mylyn.monitor.ui.AbstractUserInteractionMonitor;
import org.eclipse.ui.IWorkbenchPart;

/**
 * @author Mik Kersten
 * @author Jeff Johnston
 */
public class CDTEditorMonitor extends AbstractUserInteractionMonitor {

    protected ICElement lastSelectedElement = null;

    protected ICElement lastResolvedElement = null;

    protected CEditor currentEditor;

    protected StructuredSelection currentSelection = null;

    public CDTEditorMonitor() {
        super();
    }

    /**
     * Only public for testing
     */
    @Override
    public void handleWorkbenchPartSelection(IWorkbenchPart part, ISelection selection,
            boolean contributeToContext) {
        try {
            ICElement selectedElement = null;
            if (selection instanceof StructuredSelection) {
                StructuredSelection structuredSelection = (StructuredSelection) selection;

                if (structuredSelection.equals(currentSelection)) {
                    return;
                }
                currentSelection = structuredSelection;

                // Object selectedObject =
                // structuredSelection.getFirstElement();
                for (Iterator<?> iterator = structuredSelection.iterator(); iterator.hasNext();) {
                    Object selectedObject = iterator.next();
                    if (selectedObject instanceof ICElement) {
                        ICElement checkedElement = checkIfAcceptedAndPromoteIfNecessary((ICElement) selectedObject);
                        if (checkedElement == null) {
                            return;
                        } else {
                            selectedElement = checkedElement;
                        }
                    }
                    if (selectedElement != null) {
                        super.handleElementSelection(part, selectedElement, contributeToContext);
                    }
                }
            } else {
                if (part instanceof CEditor) {
                    currentEditor = (CEditor) part;
                    selectedElement = SelectionConverter.getElementAtOffset(currentEditor);
                    if (selectedElement == null) {
                        return; // nothing selected
                    }

                    if (selectedElement != null) {
                        if (selectedElement.equals(lastSelectedElement)) {
                            super.handleElementEdit(part, selectedElement, contributeToContext);
                        } else if (!selectedElement.equals(lastSelectedElement)) {
                            super.handleElementSelection(part, selectedElement, contributeToContext);
                        }
                    }

                    ICElement checkedElement = checkIfAcceptedAndPromoteIfNecessary(selectedElement);
                    if (checkedElement == null) {
                        return;
                    } else {
                        selectedElement = checkedElement;
                    }
                }
            }
            if (selectedElement != null) {
                lastSelectedElement = selectedElement;
            }
        } catch (CModelException e) {
            // ignore, fine to fail to resolve an element if the model is not
            // up-to-date
        }
    }

    /**
     * @return null for elements that aren't modeled
     */
    protected ICElement checkIfAcceptedAndPromoteIfNecessary(ICElement element) {
        if (!(element instanceof IBinary)) {
            return element;
        }
        return null;
    }
}