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/*******************************************************************************
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* Copyright (c) 2003, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package org.eclipse.ui.navigator;
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import java.util.ArrayList;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.Set;
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import org.eclipse.core.runtime.SafeRunner;
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import org.eclipse.jface.util.LocalSelectionTransfer;
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import org.eclipse.jface.viewers.ISelection;
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import org.eclipse.jface.viewers.ISelectionProvider;
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import org.eclipse.jface.viewers.IStructuredSelection;
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import org.eclipse.swt.dnd.DragSource;
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import org.eclipse.swt.dnd.DragSourceAdapter;
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import org.eclipse.swt.dnd.DragSourceEvent;
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import org.eclipse.swt.dnd.Transfer;
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import org.eclipse.swt.widgets.Control;
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import org.eclipse.ui.internal.navigator.NavigatorSafeRunnable;
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import org.eclipse.ui.internal.navigator.Policy;
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import org.eclipse.ui.internal.navigator.dnd.NavigatorPluginDropAction;
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import org.eclipse.ui.part.PluginTransfer;
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/**
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*
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* Provides an implementation of {@link DragSourceAdapter} which uses the
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* extensions provided by the associated {@link INavigatorContentService}.
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*
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* <p>
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* Clients should not need to create an instance of this class unless they are
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* creating their own custom viewer. Otherwise, {@link CommonViewer} configures
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* its drag adapter automatically.
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* </p>
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*
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* @see INavigatorDnDService
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* @see CommonDragAdapterAssistant
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* @see CommonDropAdapter
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* @see CommonDropAdapterAssistant
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* @see CommonViewer
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* @since 3.2
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*
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*/
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public final class CommonDragAdapter extends DragSourceAdapter {
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private final INavigatorContentService contentService;
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private final ISelectionProvider provider;
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private CommonDragAdapterAssistant setDataAssistant;
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private List assistantsToUse;
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/**
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* Create a DragAdapter that drives the configuration of the drag data.
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*
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* @param aContentService
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* The content service this Drag Adapter is associated with
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* @param aProvider
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* The provider that can give the current selection from the
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* appropriate viewer.
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*/
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public CommonDragAdapter(INavigatorContentService aContentService,
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ISelectionProvider aProvider) {
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super();
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contentService = aContentService;
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provider = aProvider;
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assistantsToUse = new ArrayList();
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}
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/**
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*
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* @return An array of supported Drag Transfer types. The list contains [
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* {@link LocalSelectionTransfer#getTransfer()},
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* {@link PluginTransfer#getInstance()}] in addition to any
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* supported types contributed by the
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* {@link CommonDragAdapterAssistant assistants}.
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* @see CommonDragAdapterAssistant
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* @see LocalSelectionTransfer
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* @see PluginTransfer
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*/
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public Transfer[] getSupportedDragTransfers() {
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CommonDragAdapterAssistant[] assistants = contentService
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.getDnDService().getCommonDragAssistants();
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Set supportedTypes = new LinkedHashSet();
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supportedTypes.add(PluginTransfer.getInstance());
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supportedTypes.add(LocalSelectionTransfer.getTransfer());
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Transfer[] transferTypes = null;
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for (int i = 0; i < assistants.length; i++) {
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transferTypes = assistants[i].getSupportedTransferTypes();
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for (int j = 0; j < transferTypes.length; j++) {
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if (transferTypes[j] != null) {
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supportedTypes.add(transferTypes[j]);
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}
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}
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}
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Transfer[] transfers = (Transfer[]) supportedTypes
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.toArray(new Transfer[supportedTypes.size()]);
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return transfers;
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}
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/*
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* (non-Javadoc)
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*
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* @see org.eclipse.swt.dnd.DragSourceAdapter#dragStart(org.eclipse.swt.dnd.DragSourceEvent)
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*/
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public void dragStart(final DragSourceEvent event) {
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if (Policy.DEBUG_DND) {
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System.out.println("CommonDragAdapter.dragStart (begin): " + event); //$NON-NLS-1$
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}
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SafeRunner.run(new NavigatorSafeRunnable() {
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public void run() throws Exception {
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DragSource dragSource = (DragSource) event.widget;
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if (Policy.DEBUG_DND) {
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System.out.println("CommonDragAdapter.dragStart source: " + dragSource); //$NON-NLS-1$
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}
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Control control = dragSource.getControl();
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if (control == control.getDisplay().getFocusControl()) {
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ISelection selection = provider.getSelection();
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assistantsToUse.clear();
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if (!selection.isEmpty()) {
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LocalSelectionTransfer.getTransfer().setSelection(selection);
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boolean doIt = false;
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INavigatorDnDService dndService = contentService.getDnDService();
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CommonDragAdapterAssistant[] assistants = dndService
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.getCommonDragAssistants();
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if (assistants.length == 0)
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doIt = true;
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for (int i = 0; i < assistants.length; i++) {
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if (Policy.DEBUG_DND) {
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System.out
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.println("CommonDragAdapter.dragStart assistant: " + assistants[i]); //$NON-NLS-1$
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}
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event.doit = true;
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assistants[i].dragStart(event, (IStructuredSelection) selection);
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doIt |= event.doit;
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if (event.doit) {
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if (Policy.DEBUG_DND) {
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System.out
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.println("CommonDragAdapter.dragStart assistant - event.doit == true"); //$NON-NLS-1$
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}
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assistantsToUse.add(assistants[i]);
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}
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}
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event.doit = doIt;
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} else {
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event.doit = false;
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}
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} else {
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event.doit = false;
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}
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}
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});
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if (Policy.DEBUG_DND) {
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System.out.println("CommonDragAdapter.dragStart (end): doit=" + event.doit); //$NON-NLS-1$
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}
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}
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/*
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* (non-Javadoc)
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*
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* @see org.eclipse.swt.dnd.DragSourceAdapter#dragSetData(org.eclipse.swt.dnd.DragSourceEvent)
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*/
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public void dragSetData(final DragSourceEvent event) {
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final ISelection selection = LocalSelectionTransfer.getTransfer()
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.getSelection();
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if (Policy.DEBUG_DND) {
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System.out
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.println("CommonDragAdapter.dragSetData: event" + event + " selection=" + selection); //$NON-NLS-1$ //$NON-NLS-2$
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}
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if (LocalSelectionTransfer.getTransfer()
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.isSupportedType(event.dataType)) {
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event.data = selection;
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if (Policy.DEBUG_DND) {
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System.out
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.println("CommonDragAdapter.dragSetData set LocalSelectionTransfer: " + event.data); //$NON-NLS-1$
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}
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} else if (PluginTransfer.getInstance().isSupportedType(event.dataType)) {
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event.data = NavigatorPluginDropAction
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.createTransferData(contentService);
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if (Policy.DEBUG_DND) {
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System.out
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.println("CommonDragAdapter.dragSetData set PluginTransfer: " + event.data); //$NON-NLS-1$
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}
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} else if (selection instanceof IStructuredSelection) {
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if (Policy.DEBUG_DND) {
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System.out
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.println("CommonDragAdapter.dragSetData looking for assistants"); //$NON-NLS-1$
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}
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for (int i = 0, len = assistantsToUse.size(); i < len; i++) {
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final CommonDragAdapterAssistant assistant = (CommonDragAdapterAssistant) assistantsToUse.get(i);
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if (Policy.DEBUG_DND) {
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System.out
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.println("CommonDragAdapter.dragSetData assistant: " + assistant); //$NON-NLS-1$
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}
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Transfer[] supportedTransferTypes = assistant
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.getSupportedTransferTypes();
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final boolean[] getOut = new boolean[1];
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for (int j = 0; j < supportedTransferTypes.length; j++) {
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if (supportedTransferTypes[j].isSupportedType(event.dataType)) {
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SafeRunner.run(new NavigatorSafeRunnable() {
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public void run() throws Exception {
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if (Policy.DEBUG_DND) {
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System.out
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.println("CommonDragAdapter.dragSetData supported xfer type"); //$NON-NLS-1$
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}
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if (assistant.setDragData(event, (IStructuredSelection) selection)) {
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if (Policy.DEBUG_DND) {
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System.out
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.println("CommonDragAdapter.dragSetData set data " + event.data); //$NON-NLS-1$
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}
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setDataAssistant = assistant;
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getOut[0] = true;
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}
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}
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});
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if (getOut[0])
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return;
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}
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}
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}
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if (Policy.DEBUG_DND) {
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System.out
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.println("CommonDragAdapter.dragSetData FAILED no assistant handled it"); //$NON-NLS-1$
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}
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event.doit = false;
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} else {
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if (Policy.DEBUG_DND) {
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System.out
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.println("CommonDragAdapter.dragSetData FAILED can't identify transfer type"); //$NON-NLS-1$
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}
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event.doit = false;
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}
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}
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/*
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* (non-Javadoc)
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*
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* @see org.eclipse.swt.dnd.DragSourceAdapter#dragFinished(org.eclipse.swt.dnd.DragSourceEvent)
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*/
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public void dragFinished(DragSourceEvent event) {
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if (Policy.DEBUG_DND) {
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System.out.println("CommonDragAdapter.dragFinished(): " + event); //$NON-NLS-1$
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}
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ISelection selection = LocalSelectionTransfer.getTransfer().getSelection();
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if (event.doit && selection instanceof IStructuredSelection && setDataAssistant != null)
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setDataAssistant.dragFinished(event, (IStructuredSelection) selection);
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setDataAssistant = null;
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LocalSelectionTransfer.getTransfer().setSelection(null);
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// TODO Handle clean up if drop target was outside of workbench
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// if (event.doit != false) {
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//
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// }
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}
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}
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