bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/EditorAreaDropAdapter.java

/************************************************************************
Copyright (c) 2002 IBM Corporation and others.
All rights reserved.   This program and the accompanying materials
are made available under the terms of the Common Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v10.html

Contributors:
	IBM - Initial implementation
************************************************************************/

package org.eclipse.ui.internal;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IResource;

import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DropTargetAdapter;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.widgets.Display;

import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.internal.misc.Assert;
import org.eclipse.ui.part.EditorInputTransfer;
import org.eclipse.ui.part.MarkerTransfer;
import org.eclipse.ui.part.ResourceTransfer;

/* package */ class EditorAreaDropAdapter extends DropTargetAdapter {
	
	private WorkbenchPage page;
	
	/**
	 * Constructs a new EditorAreaDropAdapter.
	 * @param page the workbench page
	 */
	public EditorAreaDropAdapter(WorkbenchPage page) {
		this.page = page;
	}


	public void drop(final DropTargetEvent event) {
		Display d = page.getWorkbenchWindow().getShell().getDisplay();
		d.asyncExec(new Runnable() {
			public void run() {
				asyncDrop(event);
			}
		});
	}

	private void asyncDrop(DropTargetEvent event) {

		/* Open Editor for generic IEditorInput */
		if (EditorInputTransfer.getInstance().isSupportedType(event.currentDataType)) {
			/* event.data is an array of EditorInputData, which contains an IEditorInput and 
			 * the corresponding editorId */
			Assert.isTrue(event.data instanceof EditorInputTransfer.EditorInputData[]);
			EditorInputTransfer.EditorInputData[] editorInputs = (EditorInputTransfer.EditorInputData []) event.data;

			try { //open all the markers
				for (int i = 0; i < editorInputs.length; i++) {
					String editorId = editorInputs[i].editorId;
					IEditorInput editorInput = editorInputs[i].input;
					page.openInternalEditor(editorInput, editorId);	
				}
			} catch (PartInitException e) {
				//do nothing, user may have been trying to drag a marker with no associated file
			}
		}
			
		/* Open Editor for Marker (e.g. Tasks, Bookmarks, etc) */
		else if (MarkerTransfer.getInstance().isSupportedType(event.currentDataType)) {
			Assert.isTrue(event.data instanceof IMarker[]);
			IMarker[] markers = (IMarker[]) event.data;
			try { //open all the markers
				for (int i = 0; i < markers.length; i++) {
					page.openInternalEditor(markers[i]);	
				}
			} catch (PartInitException e) {
				//do nothing, user may have been trying to drag a marker with no associated file
			}
		}

		/* Open Editor for resource */
		else if (ResourceTransfer.getInstance().isSupportedType(event.currentDataType)) {
			Assert.isTrue(event.data instanceof IResource[]);
			IResource[] files = (IResource[]) event.data;
			try { //open all the files
				for (int i = 0; i < files.length; i++) {
					if (files[i] instanceof IFile)
						page.openInternalEditor((IFile)files[i]);	
				}
			} catch (PartInitException e) {
				//do nothing, user may have been trying to drag a folder
			}
		}
			
	}
	
	public void dragOver(DropTargetEvent event) {				
		//make sure the file is never moved; always do a copy
		event.detail = DND.DROP_COPY;
	}
}