| /******************************************************************************* |
| * Copyright (c) 2000, 2005 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.jdt.internal.ui.typehierarchy; |
| |
| import org.eclipse.swt.dnd.DND; |
| import org.eclipse.swt.dnd.DropTargetEvent; |
| |
| import org.eclipse.jface.viewers.AbstractTreeViewer; |
| import org.eclipse.jface.viewers.ISelection; |
| |
| import org.eclipse.jdt.core.IJavaElement; |
| |
| import org.eclipse.jdt.internal.ui.packageview.SelectionTransferDropAdapter; |
| import org.eclipse.jdt.internal.ui.util.OpenTypeHierarchyUtil; |
| import org.eclipse.jdt.internal.ui.util.SelectionUtil; |
| |
| public class TypeHierarchyTransferDropAdapter extends SelectionTransferDropAdapter { |
| |
| private static final int OPERATION = DND.DROP_LINK; |
| private TypeHierarchyViewPart fTypeHierarchyViewPart; |
| |
| public TypeHierarchyTransferDropAdapter(TypeHierarchyViewPart viewPart, AbstractTreeViewer viewer) { |
| super(viewer); |
| setFullWidthMatchesItem(false); |
| fTypeHierarchyViewPart= viewPart; |
| } |
| |
| public void validateDrop(Object target, DropTargetEvent event, int operation) { |
| event.detail= DND.DROP_NONE; |
| initializeSelection(); |
| if (target != null){ |
| super.validateDrop(target, event, operation); |
| return; |
| } |
| if (getInputElement(getSelection()) != null) |
| event.detail= TypeHierarchyTransferDropAdapter.OPERATION; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jdt.internal.ui.packageview.SelectionTransferDropAdapter#isEnabled(org.eclipse.swt.dnd.DropTargetEvent) |
| */ |
| public boolean isEnabled(DropTargetEvent event) { |
| return true; |
| } |
| |
| public void drop(Object target, DropTargetEvent event) { |
| if (target != null || event.detail != TypeHierarchyTransferDropAdapter.OPERATION){ |
| super.drop(target, event); |
| return; |
| } |
| IJavaElement input= getInputElement(getSelection()); |
| fTypeHierarchyViewPart.setInputElement(input); |
| } |
| |
| private static IJavaElement getInputElement(ISelection selection) { |
| Object single= SelectionUtil.getSingleElement(selection); |
| if (single == null) |
| return null; |
| IJavaElement[] candidates= OpenTypeHierarchyUtil.getCandidates(single); |
| if (candidates != null && candidates.length > 0) |
| return candidates[0]; |
| return null; |
| } |
| } |